debian/mpv-fourier: new package

Mirror of arch/mpv-fourier into the Debian tree.  Same source
pin (mpv 0.41.0), same 3 patches:
  - 0001-meson-add-detection-logic-for-v4l2request-support.patch
  - 0002-vo-hwdec-drmprime-add-separate-hwdecs-for-v4l2reques.patch
    (Kwiboo + Langdale wiring for AV_HWDEVICE_TYPE_V4L2REQUEST
     through drmprime VO hwdec — '--hwdec=v4l2request' actually
     engages on dmabuf-wayland)
  - 0001-vo_dmabuf_wayland-explicit-cache-sync-on-import-fd.patch
    (iter1 of dmabuf-modifier-triage — explicit DMA_BUF_IOCTL_SYNC
     on import fds; KWin-on-RK3566 dark-green chroma readback
     regression fix on ohm.  Root cause is the vb2_dma_resv RFC
     upstream still pending.)

Depends on ffmpeg-v4l2-request-fourier (>= 2:8.1+rfourier) —
AV_HWDEVICE_TYPE_V4L2REQUEST only exists in Kwiboo's FFmpeg
fork; stock Debian ffmpeg doesn't have it.

Conflicts/Replaces stock mpv + libmpv2/libmpv1 — drop-in
replacement.  Takes epoch 1.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -375,7 +375,7 @@ jobs:
         run: rm -f /root/repo_pass /root/.ssh/id_ed25519
 
   # -------------------------------------------------------------------------
-  # ffmpeg-v4l2-request-git (aarch64 only) — FFmpeg with V4L2 Request API
+  # ffmpeg-v4l2-request-fourier (aarch64 only) — FFmpeg with V4L2 Request API
   # hwaccel for Rockchip / Allwinner stateless decoders. Used by the Fourier
   # umbrella (ohm, fresnel, ampere). Long-running build, so failures don't
   # block downstream debian jobs.
@@ -416,11 +416,11 @@ jobs:
           chmod 600 /root/.ssh/id_ed25519
           ssh-keyscan -t ed25519 nc.reauktion.de > /root/.ssh/known_hosts 2>/dev/null
 
-      - name: makepkg ffmpeg-v4l2-request-git
+      - name: makepkg ffmpeg-v4l2-request-fourier
         run: |
           set -e
           rm -rf /tmp/build-ffmpeg-v4l2
-          cp -r arch/ffmpeg-v4l2-request-git /tmp/build-ffmpeg-v4l2
+          cp -r arch/ffmpeg-v4l2-request-fourier /tmp/build-ffmpeg-v4l2
           chown -R builder:builder /tmp/build-ffmpeg-v4l2
           cd /tmp/build-ffmpeg-v4l2
           # Parallelise wide; distcc-avahi distributes compiles across the
@@ -429,7 +429,7 @@ jobs:
             makepkg --nocheck --noconfirm --syncdeps --cleanbuild
           ls -la *.pkg.tar.* | grep -v "\.sig$"
 
-      - name: sign ffmpeg-v4l2-request-git
+      - name: sign ffmpeg-v4l2-request-fourier
         run: |
           set -e
           cd /tmp/build-ffmpeg-v4l2

arch/daedalus-v4l2-dkms/PKGBUILD

@@ -0,0 +1,71 @@
+# Maintainer: Markus Fritsche <fritsche.markus@gmail.com>
+#
+# daedalus-v4l2-dkms — DKMS package for the daedalus_v4l2 out-of-tree
+# kernel module (V4L2 stateless decoder shim for Pi 5 / CM5).
+#
+# Pair to daedalus-v4l2 (userspace daemon).  When loaded, the module
+# registers /dev/videoNN (V4L2 m2m) + /dev/mediaNN (media controller) +
+# /dev/daedalus-v4l2 (chardev to the userspace daemon).  Userspace
+# clients drive the V4L2 m2m + request API path; the daemon does the
+# actual FFmpeg-backed decode on /dev/daedalus-v4l2.
+#
+# Project: https://git.reauktion.de/reauktion/daedalus-v4l2
+# Sibling userspace package: daedalus-v4l2
+# Sibling consumer: libva-v4l2-request-fourier
+
+pkgname=daedalus-v4l2-dkms
+_module=daedalus_v4l2
+
+# Same pin as arch/daedalus-v4l2 — keep kernel module + daemon
+# bit-versioned together so the chardev wire protocol stays in sync.
+_commit=f55b2cdab8a8c0bc04e8c1bb1d0b6ca85e7d96d2
+
+pkgver=0.1.0.r16.f55b2cd
+pkgrel=1
+pkgdesc="V4L2 stateless decoder shim kernel module (DKMS) — Pi 5 / CM5"
+arch=('any')
+url="https://git.reauktion.de/reauktion/daedalus-v4l2"
+license=('GPL-2.0-or-later')
+depends=('dkms')
+makedepends=('git')
+install="${pkgname}.install"
+
+source=("git+https://git.reauktion.de/reauktion/daedalus-v4l2.git#commit=${_commit}"
+        "dkms.conf"
+        "${pkgname}.install")
+sha256sums=('SKIP'
+            'SKIP'
+            'SKIP')
+
+pkgver() {
+    cd "${srcdir}/daedalus-v4l2"
+    printf '0.1.0.r%s.%s' \
+        "$(git rev-list --count HEAD)" \
+        "$(git rev-parse --short=7 HEAD)"
+}
+
+package() {
+    local _src="${pkgdir}/usr/src/${_module}-${pkgver}"
+
+    install -dm755 "${_src}"
+
+    # Install the kernel/ subdir and embed the shared proto header in
+    # the same tree.  The in-tree Makefile uses
+    # `ccflags-y += -I$(src)/../include` (assuming the parent
+    # daedalus-v4l2 layout); for DKMS we flatten by copying the header
+    # into kernel/include/ and patching the Makefile to point there.
+    cp -r "${srcdir}/daedalus-v4l2/kernel/." "${_src}/"
+    install -Dm644 "${srcdir}/daedalus-v4l2/include/daedalus_v4l2_proto.h" \
+        "${_src}/include/daedalus_v4l2_proto.h"
+    sed -i 's|-I\$(src)/\.\./include|-I$(src)/include|' "${_src}/Makefile"
+
+    # dkms.conf at the root of the source tree (DKMS convention).
+    # Substitute #MODULE_VERSION# placeholder with the actual pkgver
+    # so dkms install/uninstall match what's on disk.
+    install -Dm644 "${srcdir}/dkms.conf" "${_src}/dkms.conf"
+    sed -i "s/#MODULE_VERSION#/${pkgver}/" "${_src}/dkms.conf"
+
+    # License
+    install -Dm644 "${srcdir}/daedalus-v4l2/kernel/daedalus_v4l2_main.c" \
+        "${pkgdir}/usr/share/licenses/${pkgname}/SPDX-HEADER"
+}

arch/daedalus-v4l2-dkms/daedalus-v4l2-dkms.install

@@ -0,0 +1,61 @@
+# post-install / post-upgrade hook for daedalus-v4l2-dkms.
+#
+# pacman + the dkms-helpers alpm hook will already attempt
+# `dkms install` on its own.  This script's job is to emit a
+# loud, actionable warning when the module didn't actually
+# build for the running kernel — most commonly because the
+# kernel headers package isn't installed yet.
+#
+# Without this you get a silent failure: the package looks
+# installed but `modprobe daedalus_v4l2` returns ENOENT.
+
+_check_dkms_built() {
+    local name=daedalus_v4l2
+    local ver=$1
+    local kernelver=$(uname -r)
+
+    if ! command -v dkms >/dev/null 2>&1; then
+        return 1  # the hard-dep should have caught this
+    fi
+
+    local status
+    status=$(dkms status -m "$name" -v "$ver" -k "$kernelver" 2>/dev/null || true)
+    if printf '%s\n' "$status" | grep -q -E 'installed|loaded'; then
+        return 0  # all good
+    fi
+
+    cat >&2 <<EOF
+==> daedalus-v4l2-dkms: DKMS build did NOT land for kernel $kernelver.
+==>   dkms status -m $name -v $ver -k $kernelver:
+==>     $(printf '%s' "$status" | head -1)
+==>
+==> Most likely cause: kernel headers package is missing.
+==>   Arch / ALARM:     pacman -S linux-rpi-headers (or linux-rpi5-headers)
+==>   Raspberry Pi OS:  apt install linux-headers-rpi-2712
+==>
+==> After installing headers, finish the install with:
+==>   sudo dkms autoinstall $name/$ver
+==>   sudo modprobe daedalus_v4l2
+==>
+==> Until then daedalus_v4l2 will NOT be loadable and the
+==> userspace daedalus-v4l2 daemon will have nothing to talk to.
+EOF
+    return 1
+}
+
+post_install() {
+    _check_dkms_built "$1" || true
+}
+
+post_upgrade() {
+    # New version pinned by the bump may have built fine, but if
+    # a kernel-headers package was uninstalled / pruned since the
+    # last upgrade we'd silently regress.  Re-check.
+    _check_dkms_built "$1" || true
+}
+
+pre_remove() {
+    # The dkms alpm hook handles dkms remove on its own; nothing
+    # we need to add here.
+    :
+}

arch/daedalus-v4l2-dkms/dkms.conf

@@ -0,0 +1,19 @@
+# DKMS configuration for daedalus_v4l2 — V4L2 stateless decoder shim.
+#
+# Built against /lib/modules/$kernelver/build with the in-tree Makefile.
+# The Makefile uses `obj-m := daedalus_v4l2.o` and links
+# daedalus_v4l2_main.o + daedalus_v4l2_chardev.o into the final .ko.
+
+PACKAGE_NAME="daedalus_v4l2"
+PACKAGE_VERSION="#MODULE_VERSION#"
+
+# Single module produced by the Makefile.
+BUILT_MODULE_NAME[0]="daedalus_v4l2"
+DEST_MODULE_LOCATION[0]="/updates"
+
+# Use the package's own Makefile — it already does
+# `$(MAKE) -C $(KERNELDIR) M=$(PWD) modules`.
+MAKE[0]="make KERNELDIR=/lib/modules/${kernelver}/build all"
+CLEAN="make KERNELDIR=/lib/modules/${kernelver}/build clean"
+
+AUTOINSTALL="yes"

arch/daedalus-v4l2/PKGBUILD

@@ -0,0 +1,105 @@
+# Maintainer: Markus Fritsche <fritsche.markus@gmail.com>
+#
+# daedalus-v4l2 — userspace daemon + V4L2 m2m test tools.
+#
+# Pair to daedalus-v4l2-dkms (kernel module).  Together they expose
+# /dev/videoNN + /dev/mediaNN as a V4L2 stateless decoder shim on Pi 5 /
+# CM5, decoding VP9 / AV1 / H.264 via dlopen'd FFmpeg in a single-
+# threaded daemon and shipping decoded NV12 / P010 back through dmabuf.
+# Consumed end-to-end by libva-v4l2-request-fourier (>= 1.0.0.r376) so
+# `ffmpeg -hwaccel vaapi` against vp9_small.ivf produces byte-exact NV12.
+#
+# Project: https://git.reauktion.de/reauktion/daedalus-v4l2
+# Sibling kernel package: daedalus-v4l2-dkms
+# Sibling consumer: libva-v4l2-request-fourier
+
+pkgname=daedalus-v4l2
+_upstreampkg=daedalus-v4l2
+
+# Pin the daedalus-v4l2 tip.  f55b2cd = "Phase 8.13: byte-exact end-to-
+# end via libva (consumer target hit)" — first commit where the full
+# ffmpeg -hwaccel vaapi → libva → /dev/video0 → daemon path lands a
+# pixel-correct decoded frame back in ffmpeg.  Promote to a later pin
+# only after a future phase closes cleanly.
+_commit=f55b2cdab8a8c0bc04e8c1bb1d0b6ca85e7d96d2
+
+# 0.1.0 (pre-1.0) + commit count + short sha.  Bump the .Y on each
+# Phase 8.x close.  pkgver() recomputes at build time.
+pkgver=0.1.0.r16.f55b2cd
+pkgrel=1
+pkgdesc="Userspace daemon for the daedalus-v4l2 V4L2 stateless decoder shim (VP9/AV1/H.264 on Pi 5 / CM5)"
+arch=('aarch64')
+url="https://git.reauktion.de/reauktion/daedalus-v4l2"
+license=('BSD-2-Clause' 'GPL-2.0-or-later')
+# Daemon dlopens libavformat.so.61 / libavcodec.so.61 / libavutil.so.59
+# at runtime (Option γ — see daemon/src/ffmpeg_loader.h).  ffmpeg
+# provides those; we don't link them.
+depends=('ffmpeg' 'libdrm')
+# Headers from libav*-dev needed at compile time for type-safe function
+# pointer signatures; pkg-config locates them.
+makedepends=('cmake' 'ninja' 'pkgconf' 'git' 'ffmpeg')
+optdepends=('daedalus-v4l2-dkms: kernel module providing /dev/video0 + /dev/daedalus-v4l2'
+            'libva-v4l2-request-fourier: VA-API consumer routing through this daemon')
+
+source=("git+https://git.reauktion.de/reauktion/daedalus-v4l2.git#commit=${_commit}")
+sha256sums=('SKIP')
+
+pkgver() {
+    cd "${srcdir}/${_upstreampkg}"
+    printf '0.1.0.r%s.%s' \
+        "$(git rev-list --count HEAD)" \
+        "$(git rev-parse --short=7 HEAD)"
+}
+
+build() {
+    cd "${srcdir}/${_upstreampkg}/daemon"
+    cmake -B build -G Ninja \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DCMAKE_INSTALL_PREFIX=/usr
+    cmake --build build
+
+    cd "${srcdir}/${_upstreampkg}/tools"
+    make
+}
+
+package() {
+    cd "${srcdir}/${_upstreampkg}"
+
+    # Daemon binary
+    install -Dm755 daemon/build/daedalus_v4l2_daemon \
+        "${pkgdir}/usr/bin/daedalus_v4l2_daemon"
+
+    # Test tools (under /usr/libexec to keep them out of the default PATH
+    # — they're for verification, not daily use).
+    install -Dm755 tools/test_chardev_pingpong \
+        "${pkgdir}/usr/libexec/daedalus-v4l2/test_chardev_pingpong"
+    install -Dm755 tools/test_m2m_decode \
+        "${pkgdir}/usr/libexec/daedalus-v4l2/test_m2m_decode"
+    install -Dm755 tools/test_m2m_stream \
+        "${pkgdir}/usr/libexec/daedalus-v4l2/test_m2m_stream"
+
+    # Shared wire-protocol header (kernel ↔ daemon); useful for
+    # third-party clients of the chardev.
+    install -Dm644 include/daedalus_v4l2_proto.h \
+        "${pkgdir}/usr/include/daedalus_v4l2_proto.h"
+
+    # Documentation
+    install -Dm644 README.md \
+        "${pkgdir}/usr/share/doc/${pkgname}/README.md"
+    for d in docs/*.md; do
+        install -Dm644 "$d" "${pkgdir}/usr/share/doc/${pkgname}/$(basename "$d")"
+    done
+
+    # Licenses: BSD-2-Clause for daemon/tools, GPL for the kernel proto
+    # header; the SPDX headers in src/ are the canonical declaration but
+    # ship a short note here for package-manager-driven license queries.
+    install -dm755 "${pkgdir}/usr/share/licenses/${pkgname}"
+    cat > "${pkgdir}/usr/share/licenses/${pkgname}/LICENSE" <<'EOF'
+daedalus-v4l2 userspace components are BSD-2-Clause licensed.
+The shared kernel↔daemon wire protocol header
+(/usr/include/daedalus_v4l2_proto.h) is GPL-2.0-or-later WITH
+Linux-syscall-note for kernel-side compatibility.  See SPDX
+headers on individual source files for the canonical
+per-file declaration.
+EOF
+}

arch/ffmpeg-v4l2-request-fourier/0002-nv15-to-p010-unpack.patch

@@ -0,0 +1,178 @@
+From 0cd6e669735e453ec8772f111065bbb2f70a5bc6 Mon Sep 17 00:00:00 2001
+From: Markus Fritsche <mfritsche@reauktion.de>
+Date: Mon, 18 May 2026 07:27:10 +0000
+Subject: [PATCH] avutil/hwcontext_v4l2request: unpack NV15 to P010 in
+ transfer_data_from
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+V4L2_PIX_FMT_NV15 (RK3399/RK3588 rkvdec 10-bit 4:2:0 capture) is mapped to
+sw_format = AV_PIX_FMT_YUV420P10 in v4l2request_capture_pixelformats[]. The
+existing transfer_get_formats explicitly blanked the format list for that
+sw_format, so 'ffmpeg -hwaccel v4l2request -vf hwdownload,format=p010le' on
+a Hi10P / Main10 input failed at filter init with EINVAL before reaching
+the actual decode (which itself succeeds — 2 frames decoded cleanly).
+
+Expose AV_PIX_FMT_P010 as the transfer target for NV15-backed surfaces and
+unpack the packed 10-bit samples into the standard high-bits-of-16 layout
+inside transfer_data_from. Luma and chroma share the same packing format
+(5 bytes per 4 samples, little endian); chroma plane is W × H/2 samples
+for 4:2:0.
+
+The other 'needs custom unpack' sw_formats (YUV420P / Allwinner NV12_32L32
+tiled and YUV422P10 / rkvdec NV20) keep the original ENOSYS path because
+they need different unpack code that isn't covered by this patch.
+
+Closes marfrit/marfrit-packages#21.
+---
+ libavutil/hwcontext_v4l2request.c | 111 +++++++++++++++++++++++++++++-
+ 1 file changed, 110 insertions(+), 1 deletion(-)
+
+diff --git a/libavutil/hwcontext_v4l2request.c b/libavutil/hwcontext_v4l2request.c
+index b6633d9081..3842160dfb 100644
+--- a/libavutil/hwcontext_v4l2request.c
++++ b/libavutil/hwcontext_v4l2request.c
+@@ -1073,6 +1073,56 @@ fail:
+     return ret;
+ }
+ 
++/*
++ * Unpack one NV15-packed 10-bit plane (5 bytes per 4 samples, little endian)
++ * into a P010-style plane (10 bits in the high bits of a 16-bit container).
++ * `dst_stride` is in bytes; `src_stride` is bytes per row of NV15 data.
++ */
++static void v4l2request_nv15_unpack_plane_to_p010(const uint8_t *src,
++                                                  uint16_t *dst,
++                                                  unsigned width,
++                                                  unsigned height,
++                                                  unsigned src_stride,
++                                                  unsigned dst_stride)
++{
++    for (unsigned y = 0; y < height; y++) {
++        const uint8_t *s = src + y * src_stride;
++        uint16_t *d = (uint16_t *)((uint8_t *)dst + y * dst_stride);
++        unsigned x;
++
++        for (x = 0; x + 4 <= width; x += 4) {
++            uint16_t a = (uint16_t)s[0] | ((uint16_t)(s[1] & 0x03) << 8);
++            uint16_t b = ((uint16_t)s[1] >> 2) | ((uint16_t)(s[2] & 0x0F) << 6);
++            uint16_t c = ((uint16_t)s[2] >> 4) | ((uint16_t)(s[3] & 0x3F) << 4);
++            uint16_t e = ((uint16_t)s[3] >> 6) | ((uint16_t)s[4] << 2);
++
++            d[0] = (uint16_t)(a << 6);
++            d[1] = (uint16_t)(b << 6);
++            d[2] = (uint16_t)(c << 6);
++            d[3] = (uint16_t)(e << 6);
++
++            d += 4;
++            s += 5;
++        }
++
++        if (x < width) {
++            unsigned rem = width - x;
++            uint16_t pix[4] = { 0, 0, 0, 0 };
++
++            pix[0] = (uint16_t)s[0] | ((uint16_t)(s[1] & 0x03) << 8);
++            if (rem >= 2)
++                pix[1] = ((uint16_t)s[1] >> 2) | ((uint16_t)(s[2] & 0x0F) << 6);
++            if (rem >= 3)
++                pix[2] = ((uint16_t)s[2] >> 4) | ((uint16_t)(s[3] & 0x3F) << 4);
++            if (rem >= 4)
++                pix[3] = ((uint16_t)s[3] >> 6) | ((uint16_t)s[4] << 2);
++
++            for (unsigned j = 0; j < rem; j++)
++                d[j] = (uint16_t)(pix[j] << 6);
++        }
++    }
++}
++
+ static int v4l2request_transfer_get_formats(AVHWFramesContext *hwfc,
+                                             enum AVHWFrameTransferDirection dir,
+                                             enum AVPixelFormat **formats)
+@@ -1082,6 +1132,22 @@ static int v4l2request_transfer_get_formats(AVHWFramesContext *hwfc,
+     if (dir == AV_HWFRAME_TRANSFER_DIRECTION_TO)
+         return AVERROR(ENOSYS);
+ 
++    /*
++     * NV15-backed surfaces (sw_format = YUV420P10) are exposed as P010 to
++     * downstream filters: the unpack below converts the packed 10-bit
++     * samples into the standard high-bits-of-16 layout. Hi10P / Main10
++     * VAAPI/v4l2-request decode reaches userspace through this path.
++     */
++    if (hwfc->sw_format == AV_PIX_FMT_YUV420P10) {
++        fmts = av_malloc_array(2, sizeof(*fmts));
++        if (!fmts)
++            return AVERROR(ENOMEM);
++        fmts[0] = AV_PIX_FMT_P010;
++        fmts[1] = AV_PIX_FMT_NONE;
++        *formats = fmts;
++        return 0;
++    }
++
+     fmts = av_malloc_array(2, sizeof(*fmts));
+     if (!fmts)
+         return AVERROR(ENOMEM);
+@@ -1089,8 +1155,13 @@ static int v4l2request_transfer_get_formats(AVHWFramesContext *hwfc,
+     fmts[0] = hwfc->sw_format;
+     fmts[1] = AV_PIX_FMT_NONE;
+ 
++    /*
++     * Tiled-NV12-32L32 (Allwinner) and NV20 (rkvdec 4:2:2 10-bit) still need
++     * dedicated unpacks before hwdownload can consume them; leave them as
++     * "no transfer formats" so the filter graph reports the limitation
++     * rather than silently producing garbage.
++     */
+     if (hwfc->sw_format == AV_PIX_FMT_YUV420P ||
+-        hwfc->sw_format == AV_PIX_FMT_YUV420P10 ||
+         hwfc->sw_format == AV_PIX_FMT_YUV422P10)
+         fmts[0] = AV_PIX_FMT_NONE;
+ 
+@@ -1110,6 +1181,44 @@ static int v4l2request_transfer_data_from(AVHWFramesContext *hwfc,
+     map = av_frame_alloc();
+     if (!map)
+         return AVERROR(ENOMEM);
++
++    /*
++     * For NV15→P010, map the raw NV15 bytes (sw_format) and unpack into
++     * dst's P010 storage. Otherwise fall through to the original byte-copy
++     * path used for 1:1 sw_format matches (NV12, NV16, AFBC handled by DRM).
++     */
++    if (hwfc->sw_format == AV_PIX_FMT_YUV420P10) {
++        /*
++         * Only P010 is advertised by transfer_get_formats for this sw_format;
++         * a caller that bypasses get_formats and asks for anything else would
++         * silently corrupt output via av_frame_copy on NV15-packed bytes.
++         * Reject explicitly.
++         */
++        if (dst->format != AV_PIX_FMT_P010) {
++            ret = AVERROR(ENOSYS);
++            goto fail;
++        }
++
++        map->format = hwfc->sw_format;
++        ret = v4l2request_map_frame(hwfc, map, src);
++        if (ret)
++            goto fail;
++
++        v4l2request_nv15_unpack_plane_to_p010(map->data[0],
++                                              (uint16_t *)dst->data[0],
++                                              dst->width, dst->height,
++                                              map->linesize[0],
++                                              dst->linesize[0]);
++        /* NV15 chroma plane is W × H/2 samples (4:2:0, UV interleaved). */
++        v4l2request_nv15_unpack_plane_to_p010(map->data[1],
++                                              (uint16_t *)dst->data[1],
++                                              dst->width, dst->height / 2,
++                                              map->linesize[1],
++                                              dst->linesize[1]);
++        ret = 0;
++        goto fail;
++    }
++
+     map->format = dst->format;
+ 
+     ret = v4l2request_map_frame(hwfc, map, src);
+-- 
+2.47.3
+

arch/ffmpeg-v4l2-request-fourier/PKGBUILD

@@ -24,7 +24,7 @@ _srcname=FFmpeg
 _version='8.1'
 _commit='b57fbbe50c9b2656fad86a1a7eeabfd2b2a50935'  # v4l2-request-n8.1 tip 2026-04-24
 pkgver=8.1.r123329.b57fbbe
-pkgrel=4
+pkgrel=5
 epoch=2
 pkgdesc='FFmpeg with V4L2 Request API hwaccel (Rockchip / Allwinner stateless decode)'
 arch=('aarch64')
@@ -78,8 +78,9 @@ provides=(
 conflicts=(ffmpeg)
 replaces=(ffmpeg ffmpeg-v4l2-request-git)
 source=("git+https://github.com/Kwiboo/FFmpeg.git#commit=${_commit}"
-        '0001-libudev-bypass-fallback.patch')
-sha256sums=('SKIP' 'SKIP')
+        '0001-libudev-bypass-fallback.patch'
+        '0002-nv15-to-p010-unpack.patch')
+sha256sums=('SKIP' 'SKIP' 'SKIP')
 
 pkgver() {
   cd "${_srcname}"
@@ -91,6 +92,7 @@ pkgver() {
 prepare() {
   cd "${_srcname}"
   patch -Np1 -i "${srcdir}/0001-libudev-bypass-fallback.patch"
+  patch -Np1 -i "${srcdir}/0002-nv15-to-p010-unpack.patch"
 }
 
 build() {

arch/firefox-fourier/PKGBUILD

@@ -13,7 +13,7 @@
 
 pkgname=firefox-fourier
 pkgver=150.0.1
-pkgrel=1
+pkgrel=5
 pkgdesc='Firefox with V4L2 stateless HW video decode unlocked for mainline Linux Rockchip'
 arch=('aarch64' 'x86_64')
 url='https://www.mozilla.org/firefox'
@@ -87,8 +87,12 @@ source=(
   '0002-libwrapper-hwdevice-ctx-create.patch'
   '0003-ffmpegvideo-v4l2-request-route.patch'
   '0004-prefs-v4l2-request.patch'
+  '0005-rdd-sandbox-v4l2-media-ctl.patch'
+  # Vendor-default prefs that gate the patched VAAPI path on RK3399 —
+  # widget.dmabuf.force-enabled etc. See marfrit-packages#8 for evidence.
+  'rockchip-fourier-defaults.js'
 )
-sha256sums=('SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP')
+sha256sums=('SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP')
 
 prepare() {
   cd "${srcdir}/firefox-${pkgver}"
@@ -103,6 +107,7 @@ prepare() {
   patch -Np1 -i "${srcdir}/0002-libwrapper-hwdevice-ctx-create.patch"
   patch -Np1 -i "${srcdir}/0003-ffmpegvideo-v4l2-request-route.patch"
   patch -Np1 -i "${srcdir}/0004-prefs-v4l2-request.patch"
+  patch -Np1 -i "${srcdir}/0005-rdd-sandbox-v4l2-media-ctl.patch"
 
   cp "${srcdir}/mozconfig" .mozconfig
 }
@@ -160,4 +165,19 @@ export MOZ_X11_EGL="${MOZ_X11_EGL:-1}"
 exec /usr/lib/firefox-fourier/firefox-fourier "$@"
 LAUNCHER
   chmod 0755 "${pkgdir}/usr/bin/firefox-fourier"
+
+  # Vendor-default prefs (RK3399 HW-decode unlock) — closes #8.
+  # Lower precedence than user prefs / about:config; loaded by Firefox
+  # at startup from the package install dir. The 0004 patch covers
+  # media.ffmpeg.v4l2-request.enabled; this file covers the three
+  # additional prefs that gate the path to the patched code.
+  # Vendor-prefs install path: /usr/lib/firefox-fourier/defaults/preferences/
+  # (Mozilla's canonical scan dir for third-party default-pref drops.) The
+  # browser/defaults/preferences/ alternative looked promising but is NOT a
+  # vendor-prefs scan location in Firefox 150 — empirically confirmed on
+  # fresnel: file shipped there, VAAPI never engaged. Same file under
+  # defaults/preferences/ → MOZ_LOG showed `Requesting pixel format
+  # VAAPI_VLD` + dmabuf surfaces locking end-to-end.
+  install -Dm644 "${srcdir}/rockchip-fourier-defaults.js" \
+    "${pkgdir}/usr/lib/firefox-fourier/defaults/preferences/rockchip-fourier-defaults.js"
 }

arch/firefox-fourier/arch-0004-Bug-2023597-Use-wasm32-wasip1-target-for-clang-22.1-.patch

@@ -0,0 +1,28 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Alex Hochheiden <ahochheiden@mozilla.com>
+Date: Wed, 1 Apr 2026 18:11:37 +0000
+Subject: [PATCH] Bug 2023597 - Use `wasm32-wasip1` target for clang >= 22.1
+ r=firefox-build-system-reviewers,sergesanspaille
+
+https://github.com/llvm/llvm-project/pull/165345
+https://releases.llvm.org/22.1.0/tools/clang/docs/ReleaseNotes.html
+
+Differential Revision: https://phabricator.services.mozilla.com/D291023
+---
+ build/moz.configure/toolchain.configure | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/build/moz.configure/toolchain.configure b/build/moz.configure/toolchain.configure
+index a37ed610cc43..c7d0c8bdf75c 100644
+--- a/build/moz.configure/toolchain.configure
++++ b/build/moz.configure/toolchain.configure
+@@ -695,6 +695,9 @@ def check_compiler(configure_cache, compiler, language, target, android_version)
+         # This makes clang define __ANDROID_API__ and use versioned library
+         # directories from the NDK.
+         toolchain = "%s%d" % (target.toolchain, android_version)
++    elif target.kernel == "WASI" and info.type == "clang" and info.version >= Version("22.1"):
++        # The wasm32-wasi target was renamed to wasm32-wasip1 in LLVM 22.1.
++        toolchain = "wasm32-wasip1"
+     else:
+         toolchain = target.toolchain
+ 

arch/firefox-fourier/rockchip-fourier-defaults.js

@@ -0,0 +1,19 @@
+// firefox-fourier — RK3399 V4L2-stateless HW-decode default prefs.
+//
+// The patch series (0001..0004) builds the VAAPI / V4L2-request routing
+// path through libavcodec, but the resulting code path is gated by three
+// other prefs that are 'false' upstream because the relevant probes don't
+// fire on panfrost EGL or trip the Intel-tuned cost heuristic. Without
+// these, firefox-fourier silently SW-decodes on a fresh profile despite
+// having all the unlock patches applied.
+//
+// Filed via marfrit/marfrit-packages#8 — see that issue for MOZ_LOG
+// evidence on fresnel (Pinebook Pro / RK3399).
+//
+// These are *vendor* defaults: lower precedence than user.js and
+// about:config user prefs. Power users who want to disable HW decode for
+// debugging can flip them in user prefs without touching this file.
+
+pref("widget.dmabuf.force-enabled",                  true);
+pref("media.hardware-video-decoding.force-enabled",  true);
+pref("media.ffvpx-hw.enabled",                       true);

arch/kwin-fourier/PKGBUILD

@@ -2,7 +2,7 @@
 # Upstream maintainers: Felix Yan, Antonio Rojas
 # Contributor: Andrea Scarpino <andrea@archlinux.org>
 #
-# kwin-fourier — KWin 6.6.4 with the V4L2-stateless implicit-sync
+# kwin-fourier — KWin 6.6.5 with the V4L2-stateless implicit-sync
 # transaction wait bypass. Hypothesis: KWin's
 # `Transaction::watchDmaBuf` calls DMA_BUF_IOCTL_EXPORT_SYNC_FILE on
 # every plane of every imported dmabuf and parks the transaction on a
@@ -21,9 +21,9 @@
 # ../chromium-fourier/KWIN_PIVOT.md for the full diagnosis thread.
 
 pkgname=kwin-fourier
-pkgver=6.6.4
+pkgver=6.6.5
 _dirver=$(echo $pkgver | cut -d. -f1-3)
-pkgrel=3
+pkgrel=1
 _upname=kwin
 epoch=1
 arch=(aarch64 x86_64)
@@ -103,7 +103,7 @@ conflicts=(kwin)
 replaces=(kwin)
 source=(https://download.kde.org/stable/plasma/$_dirver/$_upname-$pkgver.tar.xz{,.sig}
         0001-transaction-bypass-watchDmaBuf-fence-wait.patch)
-sha256sums=('3f9439760580a977d018daf4b35b62e5a1700def7b21c8dfbfc789d21378d7ad'
+sha256sums=('6c187ce7a5506090b438ef900103836fa0537674dde8b31e5b497ef321643cb4'
             'SKIP'
             'SKIP')
 validpgpkeys=('E0A3EB202F8E57528E13E72FD7574483BB57B18D'  # Jonathan Esk-Riddell <jr@jriddell.org>

arch/libva-v4l2-request-fourier/PKGBUILD

@@ -6,8 +6,11 @@
 # tracks the campaign fork's git history directly, so iteration sweeps
 # (DEBUG removal, follow-up bugfixes) land in a clean linear log.
 #
-# Campaign: ~/src/libva-multiplanar/ (eight closed iterations as of
-# 2026-05-06; iter8 close is the production tip pinned below).
+# Campaign: ~/src/libva-multiplanar/ (iter8 close 2026-05-06) plus
+# ~/src/fresnel-fourier/ which carried the fork to iter38b — multi-device
+# probe so a single libva session serves all 5 codecs (rkvdec H.264 +
+# HEVC + VP9, hantro MPEG-2 + VP8) plus a bounds-check fix for
+# MAX_PROFILES. Pinned below.
 # Fork repo: https://git.reauktion.de/marfrit/libva-v4l2-request-fourier
 # Bootlin upstream: https://github.com/bootlin/libva-v4l2-request
 #
@@ -20,16 +23,25 @@
 pkgname=libva-v4l2-request-fourier
 _upstreampkg=libva-v4l2-request
 
-# Pin the fork tip. 65969da = "iter8 Phase 4: tests/run_perf_binding_cell.sh"
-# — last commit on master before fresnel-fourier work started layering
-# MPEG-2 rewrites on top of it (2026-05-08). The libva-multiplanar campaign
-# closed iter8 at this commit; promote to a later pin only after a future
-# iteration closes cleanly.
-_commit=65969da3ee901442a8ca4e1f7f9697d5461d368a
+# Pin the fork tip. de27e95 = "v4l2: log error_idx + failing ctrl id
+# on S_EXT_CTRLS failure" — Phase 8.13 diagnostic that surfaced the
+# real root cause of the libva→daedalus_v4l2 request-completion
+# timeout (turned out the EINVAL libva was logging was a harmless
+# H264/HEVC probe; actual VP9 stateless control SET worked all along).
+#
+# Prior pin (7ac934e) was iter38b — fresnel-fourier multi-device probe
+# + MAX_PROFILES bounds-check fix. de27e95 adds the daedalus_v4l2
+# probe slot (b5b3acf), the meson option gate (2146341), and the
+# S_EXT_CTRLS diagnostic (de27e95 itself). Backward-compatible on
+# rkvdec / hantro / cedrus / rpi-hevc-dec hosts — daedalus probe is
+# off by default unless the kernel module is present.
+_commit=de27e95571b67ef34619c23a12db4698f9b3454e
 
 # Project version from meson.build (1.0.0) + commit count + short sha,
-# matching the ffmpeg-v4l2-request-fourier convention.
-pkgver=1.0.0.r280.65969da
+# matching the ffmpeg-v4l2-request-fourier convention. Recomputed at
+# build time by pkgver() below; the static value here is a placeholder
+# so AUR-style consumers see something coherent before src/ exists.
+pkgver=1.0.0.r376.de27e95
 pkgrel=1
 pkgdesc="VA-API backend for V4L2 stateless decoders (multiplanar fork — fourier umbrella)"
 arch=('aarch64')
@@ -55,7 +67,15 @@ build() {
     cd "${srcdir}/${_upstreampkg}-fourier"
     # meson_options.txt only exposes 'kernel_headers' — leave it empty to
     # use system /usr/include kernel UAPI headers. No per-codec toggles.
-    arch-meson build --buildtype=release
+    #
+    # b_lto=false: override arch-meson's wrapper default of `-D b_lto=true`,
+    # which the makepkg.conf OPTIONS=(..., !lto, ...) line does NOT actually
+    # override (arch-meson hard-codes b_lto=true). The hand-built reproducer
+    # from issue #17 shows: LTO/ICF kernel-folds per-codec helpers and HEVC's
+    # multi-control-struct chain (SPS+PPS+DECODE_PARAMS+SLICE_PARAMS) gets a
+    # wrong helper-instance pulled in at vaEndPicture → segfault. The 4 other
+    # codecs (single-control-struct) tolerate the folding by accident.
+    arch-meson build --buildtype=release -Db_lto=false
     meson compile -C build
 }
 

arch/libva-v4l2-request-ohm-gl-fix/PKGBUILD

@@ -1,6 +1,13 @@
 # Maintainer: Markus Fritsche <fritsche.markus@gmail.com>
 # Campaign: ohm_gl_fix Phase 6 Step 1
 #
+# DEPRECATED (2026-05-16): superseded by ../libva-v4l2-request-fourier/
+# which tracks the campaign fork's git history directly and adds the
+# iter38 multi-device probe (single libva session for rkvdec H.264/HEVC/VP9
+# + hantro MPEG-2/VP8). The successor declares
+# replaces=('libva-v4l2-request-ohm-gl-fix'), so installing it removes
+# this package automatically. See README.md for the full deprecation note.
+#
 # Forks libva-v4l2-request to add hantro-vpu multiplanar + modern
 # stateless UAPI support. Conflicts/replaces stock libva-v4l2-request.
 #
@@ -11,7 +18,7 @@ pkgname=libva-v4l2-request-ohm-gl-fix
 _upstreampkg=libva-v4l2-request
 pkgver=1.0.0.r0.ga3c2476
 pkgrel=2
-pkgdesc="VA-API backend for V4L2 stateless decoders, hantro-vpu multiplanar fork"
+pkgdesc="DEPRECATED — use libva-v4l2-request-fourier. VA-API backend for V4L2 stateless decoders, hantro-vpu multiplanar fork"
 arch=('aarch64')
 url="https://github.com/bootlin/libva-v4l2-request"
 license=('LGPL2.1' 'MIT')

arch/libva-v4l2-request-ohm-gl-fix/README.md

@@ -1,5 +1,24 @@
 # libva-v4l2-request-ohm-gl-fix
 
+> ## ⚠ DEPRECATED — use [`libva-v4l2-request-fourier`](../libva-v4l2-request-fourier/) instead
+>
+> This package is the **predecessor experimental** build (tarball pin
+> + 18 stacked patches) and is no longer maintained as of 2026-05-16.
+> Its successor `libva-v4l2-request-fourier` tracks the campaign fork's
+> git history directly
+> ([git.reauktion.de/marfrit/libva-v4l2-request-fourier](https://git.reauktion.de/marfrit/libva-v4l2-request-fourier))
+> so iteration sweeps (DEBUG removal, follow-up bugfixes) land in a clean
+> linear log, and adds the iter38 multi-device probe that lets a single
+> libva session serve rkvdec H.264/HEVC/VP9 + hantro MPEG-2/VP8 without
+> needing `LIBVA_V4L2_REQUEST_VIDEO_PATH` overrides.
+>
+> `libva-v4l2-request-fourier` declares
+> `replaces=('libva-v4l2-request-ohm-gl-fix')`, so installing it will
+> remove this package automatically. Kept in-tree as historical reference
+> for the ohm_gl_fix Phase 6 audit trail.
+
+---
+
 Bootlin's libva-v4l2-request VA-API backend, with hantro-vpu
 multi-planar + chromium-149-era stateless H.264 patches developed
 in the [ohm_gl_fix campaign](../../../ohm_gl_fix/) Phase 6 Step 1

arch/linux-ampere-fourier/PKGBUILD

@@ -0,0 +1,168 @@
+# Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+#
+# linux-ampere-fourier — CoolPi GenBook (RK3588) kernel built from the
+# kernel-agent fleet/ampere.yaml manifest applied to mainline v7.0-rc3.
+#
+# kafr2 baseline (2026-05-18): mainline v7.0-rc3 + the 10 scope-tagged
+# kernel-agent patches under patches/{soc,module,board,driver}/:
+#   - 1 soc/rk3588 pwm15 pinctrl
+#   - 6 board/coolpi-cm5-genbook DTS patches (pwm-fan, RK806 power-off,
+#     speaker, USB-C PD, lid switch + USB3 PHY, microphone)
+#   - 3 driver/media VP9-on-VDPU381 patches (Sarma's v8 series, imported
+#     via marfrit/kernel-agent#12 closure and PR #24)
+#
+# Drops the prior f8f3ad9 baseline ("18 commits ahead") because that tip
+# black-screens ampere — kernel-agent's ka-promote produces this 10-patch
+# minimal set from fleet/ampere.yaml. End-to-end VP9 + AV1 (av1-vpu-dec
+# is mainline-7.0) decode verified bit-exact via kdirect on the
+# hand-built tip 48a8c78 before this package iteration was cut.
+#
+# Coexists with the user's other extlinux labels in
+# /boot/firmware/extlinux/extlinux.conf; never edits them. Adds a
+# managed `linux-ampere-fourier` label (the user sets `default` manually
+# after verifying boot).
+#
+# Bootloader path: /boot/firmware/ (vfat on mmcblk0p1). Kernel +
+# initramfs + DTB land there directly. Reverting = boot a different
+# extlinux label (e.g. arch_mainline, ubuntu_mainline).
+
+pkgbase=linux-ampere-fourier
+pkgname=("$pkgbase" "$pkgbase-headers")
+pkgver=7.0rc3.kafr2
+pkgrel=1
+pkgdesc='CoolPi GenBook kernel (v7.0-rc3 + kernel-agent fleet/ampere.yaml — 6 board patches + 3 VP9-VDPU381 + 1 pwm15)'
+arch=(aarch64)
+url='https://git.reauktion.de/marfrit/kernel-agent'
+license=(GPL-2.0-only)
+makedepends=(
+  bc cpio gettext kmod libelf pahole perl python tar xz
+  ccache
+  uboot-tools dtc
+)
+options=('!strip')
+
+# Pinned tip of the kernel-agent-managed source tree for ampere.
+# 10 commits ahead of v7.0-rc3, exactly mirroring fleet/ampere.yaml's
+# manifest under apply order:
+#   - c57d069 soc/rk3588: pwm15 pinctrl entries
+#   - 05a915c board/genbook: pwm-fan with thermal cooling
+#   - d007b90 module/coolpi-cm5: RK806 system-power-controller
+#   - 3722eab board/genbook: speaker via audio-graph-card
+#   - 3e42ab6 board/genbook: USB-C PD via FUSB302
+#   - 7c241f2 board/genbook: lid switch + USB3 PHY lane
+#   - dd545fa board/genbook: wire internal microphone
+#   - 9ddcae5 driver/media: rkvdec-vp9 helper rename (Sarma)
+#   - c5063d9 driver/media: rkvdec move vp9 to common (Sarma)
+#   - 48a8c78 driver/media: rkvdec VP9 for VDPU381 (Sarma)
+#
+# This is the same tree state ka-promote ampere produces as cumulative.patch
+# (see marfrit/kernel-agent build/ampere/v7.0-rc3/manifest.lock for the
+# b2sum + per-patch sha256s).
+_commit=48a8c785de7f5320513052a64e544c6310d7b273
+
+source=(
+  # Local tarball produced by ./prebuild.sh from a local clone of the
+  # linux-rk3588-marfrit branch. Not fetched from a URL because the
+  # boltzmann working clone is shallow (gitea push rejects) and the
+  # 260MB tarball isn't committed to marfrit-packages. Run prebuild.sh
+  # before makepkg; see README in this dir.
+  "linux-rk3588-marfrit-${_commit:0:7}.tar.gz"
+  'config'  # snapshot of running ampere kernel's /proc/config.gz (7.0.0-rc3-ARCH+)
+  'linux-ampere-fourier.preset'
+  'extlinux-add.hook'
+  'extlinux-add.sh'
+)
+sha256sums=('SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP')
+
+# kernelrelease becomes <Makefile-VERSION>.<PATCH>.<SUBLEVEL><EXTRAVERSION><LOCALVERSION>
+# i.e. 7.0.0-rc3-ampere-fourier. Module dir + EXTRAVERSION suffix keep
+# this disjoint from the hand-managed /boot/firmware/Image-7.0.0-rc3-ARCH+
+# that's currently on the host.
+_kernver=7.0.0-rc3-ampere-fourier
+_srcdir=linux-rk3588-marfrit
+
+prepare() {
+  cd "${_srcdir}"
+
+  echo ":: writing config"
+  cp "${srcdir}/config" .config
+
+  # LOCALVERSION suffix to differentiate from upstream-stock builds.
+  scripts/config --set-str LOCALVERSION "-ampere-fourier"
+  scripts/config -d LOCALVERSION_AUTO
+
+  echo ":: olddefconfig (accept new symbols sensibly)"
+  make olddefconfig
+
+  make -s kernelrelease > version
+  echo ":: kernel release: $(<version)"
+}
+
+build() {
+  cd "${_srcdir}"
+  unset LDFLAGS
+  # Native build only — no distcc per kernel-agent policy
+  # (feedback_kernel_agent_no_distcc.md). ccache stays.
+  export CC="ccache gcc"
+  export HOSTCC="ccache gcc"
+  make ${MAKEFLAGS:--j$(nproc)} Image modules dtbs
+}
+
+_package() {
+  pkgdesc='CoolPi GenBook overclocked kernel (ampere-fourier baseline)'
+  depends=(coreutils kmod mkinitcpio uboot-tools)
+  optdepends=('linux-firmware: firmware images needed for some devices')
+  backup=("etc/mkinitcpio.d/${pkgbase}.preset")
+
+  cd "${_srcdir}"
+  local _kver
+  _kver=$(<version)
+
+  # Kernel image into the vfat firmware partition (where extlinux looks).
+  install -Dm644 arch/arm64/boot/Image \
+    "${pkgdir}/boot/firmware/Image-ampere-fourier"
+
+  # Single DTB for the GenBook target — install directly under
+  # /boot/firmware/ (no subdir, matches existing host convention).
+  install -Dm644 arch/arm64/boot/dts/rockchip/rk3588-coolpi-cm5-genbook.dtb \
+    "${pkgdir}/boot/firmware/rk3588-coolpi-cm5-genbook.dtb-ampere-fourier"
+
+  ZSTD_CLEVEL=19 make INSTALL_MOD_PATH="${pkgdir}/usr" \
+    INSTALL_MOD_STRIP=1 modules_install
+  rm -f "${pkgdir}/usr/lib/modules/${_kver}/"{source,build}
+
+  install -Dm644 "${srcdir}/${pkgbase}.preset" \
+    "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"
+
+  install -Dm755 "${srcdir}/extlinux-add.hook" \
+    "${pkgdir}/usr/share/libalpm/hooks/95-${pkgbase}-extlinux.hook"
+  install -Dm755 "${srcdir}/extlinux-add.sh" \
+    "${pkgdir}/usr/share/libalpm/scripts/${pkgbase}-extlinux"
+}
+
+_package-headers() {
+  pkgdesc='Headers and scripts for the linux-ampere-fourier kernel'
+  depends=(pahole)
+
+  cd "${_srcdir}"
+  local _kver _builddir
+  _kver=$(<version)
+  _builddir="${pkgdir}/usr/lib/modules/${_kver}/build"
+
+  install -Dt "${_builddir}" -m644 .config Makefile Module.symvers System.map vmlinux version
+  install -Dt "${_builddir}/kernel" -m644 kernel/Makefile
+
+  cp -a scripts "${_builddir}"
+  install -Dt "${_builddir}/arch/arm64" -m644 arch/arm64/Makefile
+  cp -a arch/arm64/include "${_builddir}/arch/arm64/"
+  cp -a include "${_builddir}/"
+
+  find . -name 'Kbuild' -exec install -Dm644 {} "${_builddir}/{}" \;
+  find . -name 'Kconfig*' -exec install -Dm644 {} "${_builddir}/{}" \;
+
+  install -d "${pkgdir}/usr/src"
+  ln -sr "${_builddir}" "${pkgdir}/usr/src/${pkgbase}"
+}
+
+eval "package_${pkgbase}() { _package; }"
+eval "package_${pkgbase}-headers() { _package-headers; }"

arch/linux-ampere-fourier/README.md

@@ -0,0 +1,70 @@
+# linux-ampere-fourier
+
+Kernel package for ampere (CoolPi GenBook RK3588). Baselined on
+`marfrit/linux-rk3588-marfrit @ f8f3ad9` (mainline v7.0-rc3 + 18
+RK3588-fleet-relevant commits — 10 Markus, 8 upstream cherry-picks).
+
+See `marfrit/kernel-agent/fleet/ampere.yaml` for the manifest +
+`marfrit/kernel-agent/patches/{soc,module,board}/...` for the
+scope-tagged board patches in the baseline.
+
+## Build
+
+The kernel source isn't on Gitea — boltzmann's working clone is
+shallow (Gitea refuses shallow pushes) and a 260MB tarball doesn't
+belong in `marfrit-packages`. Stage the source locally from a
+clone of the `linux-rk3588-marfrit` branch:
+
+```sh
+cd arch/linux-ampere-fourier
+./prebuild.sh           # produces linux-rk3588-marfrit-f8f3ad9.tar.gz
+makepkg -s --noconfirm  # native aarch64 build; no distcc
+```
+
+`prebuild.sh` looks at `$LINUX_RK3588_MARFRIT_TREE` (default
+`~/src/linux-rockchip`) for the kernel working tree. The tip commit
+must be reachable in that clone — fetch the `linux-rk3588-marfrit`
+branch first if you cloned from elsewhere.
+
+## Build hosts
+
+Native aarch64 only (per kernel-agent `feedback_kernel_agent_no_distcc.md`).
+Either ampere itself (8C/2.4GHz, 32GB, native arch) or boltzmann
+(Rock 5 ITX+, same uarch). fermi as fallback.
+
+## Install
+
+Adds a managed label to `/boot/firmware/extlinux/extlinux.conf`:
+
+```
+label linux-ampere-fourier
+    menu label linux-ampere-fourier (managed)
+    kernel /Image-ampere-fourier
+    initrd /initramfs-ampere-fourier.img
+    fdt    /rk3588-coolpi-cm5-genbook.dtb-ampere-fourier
+    append <inherited from arch_mainline>
+```
+
+Default label is NOT changed. After verifying boot of the managed
+label at the u-boot menu, you flip `default` manually. Reverting =
+boot a different label (e.g. `arch_mainline`, `ubuntu_mainline`).
+
+## Boot path
+
+ampere uses `/boot/firmware/` (vfat on mmcblk0p1, ~1G), distinct
+from fresnel's `/boot/` on root partition. The PKGBUILD installs
+Image, initramfs, and DTB directly under `/boot/firmware/`. No
+DTB subdir — single board target.
+
+## Open follow-ups (per kernel-agent issue #6)
+
+- **Ask 2** (VP9 enablement on RK3588 rkvdec) — not addressed in this
+  iteration. Separate session.
+- **Ask 3** (AV1 decoder integration) — backend libva work, not kernel.
+- Hosting the source tarball publicly so `prebuild.sh` isn't needed —
+  candidate: Gitea release asset, or `packages.reauktion.de/sources/`.
+- Splitting the 12 non-board cherry-pick commits in the baseline
+  (4 Shawn Lin phy, 2 Cristian Ciocaltea, etc.) into scope-tagged
+  patches in kernel-agent — currently they ride along inside the
+  pinned baseline rather than being explicit `includes:` in the
+  manifest.

arch/linux-ampere-fourier/extlinux-add.hook

@@ -0,0 +1,13 @@
+[Trigger]
+Operation = Install
+Operation = Upgrade
+Operation = Remove
+Type = Path
+Target = boot/firmware/Image-ampere-fourier
+Target = boot/firmware/rk3588-coolpi-cm5-genbook.dtb-ampere-fourier
+Target = boot/firmware/initramfs-ampere-fourier.img
+
+[Action]
+Description = Updating extlinux entry for linux-ampere-fourier
+When = PostTransaction
+Exec = /usr/share/libalpm/scripts/linux-ampere-fourier-extlinux

arch/linux-ampere-fourier/extlinux-add.sh

@@ -0,0 +1,62 @@
+#!/bin/sh
+# Add / update / remove the linux-ampere-fourier entry in
+# /boot/firmware/extlinux/extlinux.conf. Idempotent. Coexists with
+# the hand-managed labels in that file; never edits them. Default
+# label is NOT touched — user picks at u-boot menu.
+#
+# ampere boots from a vfat partition (mmcblk0p1) mounted at
+# /boot/firmware/, distinct from fresnel's /boot/ on root.
+
+set -eu
+
+CONF="/boot/firmware/extlinux/extlinux.conf"
+TAG_BEGIN="# >>> linux-ampere-fourier (managed) >>>"
+TAG_END="# <<< linux-ampere-fourier (managed) <<<"
+
+# Copy APPEND from the user's `arch_mainline` label so the managed
+# entry inherits the same root= and console= settings the host's
+# bootloader already trusts. Falls back to a CoolPi GenBook default
+# if no arch_mainline label exists (first-time install on a fresh
+# bootloader config).
+EXISTING_APPEND=$(awk '
+  /^[[:space:]]*label[[:space:]]+arch_mainline[[:space:]]*$/ { found=1; next }
+  found && /^[[:space:]]*append[[:space:]]/ {
+    sub(/^[[:space:]]*append[[:space:]]+/, "")
+    print
+    exit
+  }
+  /^[[:space:]]*label[[:space:]]/ { found=0 }
+' "$CONF" 2>/dev/null || true)
+
+APPEND="${EXISTING_APPEND:-root=LABEL=arch rw rootwait rootfstype=btrfs rootflags=subvol=@,ssd,discard=async console=ttyS2,1500000 console=tty1 consoleblank=0 loglevel=7 cma=256M coherent_pool=2M}"
+
+ENTRY=$(cat <<EOF
+${TAG_BEGIN}
+label linux-ampere-fourier
+	menu label linux-ampere-fourier (managed)
+	kernel /Image-ampere-fourier
+	initrd /initramfs-ampere-fourier.img
+	fdt    /rk3588-coolpi-cm5-genbook.dtb-ampere-fourier
+	append ${APPEND}
+${TAG_END}
+EOF
+)
+
+# Strip any prior managed block, then append fresh
+TMP=$(mktemp)
+awk -v b="$TAG_BEGIN" -v e="$TAG_END" '
+  $0==b{skip=1; next}
+  $0==e{skip=0; next}
+  !skip{print}
+' "$CONF" > "$TMP"
+
+# Post-Remove: kernel files absent → don't re-add the entry
+if [ -f "/boot/firmware/Image-ampere-fourier" ] \
+   && [ -f "/boot/firmware/rk3588-coolpi-cm5-genbook.dtb-ampere-fourier" ]; then
+  printf '%s\n' "$ENTRY" >> "$TMP"
+  echo "linux-ampere-fourier: extlinux entry updated"
+else
+  echo "linux-ampere-fourier: kernel files absent, entry removed"
+fi
+
+mv "$TMP" "$CONF"

arch/linux-ampere-fourier/linux-ampere-fourier.preset

@@ -0,0 +1,13 @@
+# mkinitcpio preset for linux-ampere-fourier
+#
+# ampere boots from /boot/firmware/ (vfat partition on mmcblk0p1). The
+# initramfs lands there too so extlinux can pick it up. Only one PRESET
+# because /boot/firmware is ~1G total — no room for a fallback image
+# alongside the primary.
+
+ALL_kver="/boot/firmware/Image-ampere-fourier"
+ALL_microcode=()
+
+PRESETS=('default')
+
+default_image="/boot/firmware/initramfs-ampere-fourier.img"

arch/linux-ampere-fourier/prebuild.sh

@@ -0,0 +1,68 @@
+#!/bin/bash
+# prebuild — stage the kernel source tarball this PKGBUILD expects.
+#
+# linux-ampere-fourier's source is a snapshot of marfrit/linux-rk3588-marfrit
+# @ f8f3ad9 (260MB), too big to commit to marfrit-packages and currently
+# unpushable to Gitea (boltzmann's working clone is shallow; gitea push
+# refuses shallow updates). Hosting the tarball outside Gitea would need
+# infrastructure setup that's not in scope for the first iteration.
+#
+# So: produce the tarball locally from the kernel working tree just
+# before makepkg runs. Idempotent — if an existing tarball matches the
+# expected sha256 we skip the archive step.
+#
+# Run from this directory:  cd arch/linux-ampere-fourier && ./prebuild.sh
+# Override the kernel-tree location:  LINUX_RK3588_MARFRIT_TREE=/path ./prebuild.sh
+#
+# Default tree location matches the boltzmann/ampere convention from
+# kernel-agent issue #6: $HOME/src/linux-rockchip.
+set -euo pipefail
+
+TREE="${LINUX_RK3588_MARFRIT_TREE:-${HOME}/src/linux-rockchip}"
+COMMIT=48a8c785de7f5320513052a64e544c6310d7b273
+# Generated tarball sha varies with gzip version — script warns-not-fails.
+# Leave EXPECTED empty for fresh kafr2 builds; first successful build can
+# pin a canonical sha here if a reproducibility audit needs it.
+SHA256_EXPECTED=
+
+HERE="$(cd "$(dirname "$0")" && pwd)"
+OUTPUT="${HERE}/linux-rk3588-marfrit-${COMMIT:0:7}.tar.gz"
+
+if [ -f "$OUTPUT" ]; then
+    have=$(sha256sum "$OUTPUT" | cut -d' ' -f1)
+    if [ "$have" = "$SHA256_EXPECTED" ]; then
+        echo "prebuild: $OUTPUT already exists with correct sha256"
+        exit 0
+    else
+        echo "prebuild: existing $OUTPUT sha mismatch (have=$have, want=$SHA256_EXPECTED) — regenerating" >&2
+        rm -f "$OUTPUT"
+    fi
+fi
+
+if [ ! -d "$TREE/.git" ]; then
+    echo "prebuild: kernel tree not at $TREE" >&2
+    echo "          set LINUX_RK3588_MARFRIT_TREE=/path/to/linux-rockchip and retry" >&2
+    exit 2
+fi
+
+cd "$TREE"
+
+if ! git cat-file -e "$COMMIT" 2>/dev/null; then
+    echo "prebuild: commit $COMMIT not found in $TREE" >&2
+    echo "          fetch the linux-rk3588-marfrit branch first:" >&2
+    echo "          git fetch <remote> linux-rk3588-marfrit" >&2
+    exit 3
+fi
+
+echo "prebuild: generating archive from $TREE @ $COMMIT..."
+git archive --format=tar.gz --prefix=linux-rk3588-marfrit/ "$COMMIT" -o "$OUTPUT"
+
+# git archive emits a deterministic tar stream but gzip compression may
+# vary by version. The sha256 check is informational; warn-don't-fail.
+have=$(sha256sum "$OUTPUT" | cut -d' ' -f1)
+if [ "$have" != "$SHA256_EXPECTED" ]; then
+    echo "prebuild: WARNING $OUTPUT sha=$have (canonical=$SHA256_EXPECTED)" >&2
+    echo "          probably a gzip-version difference; tar payload should be identical" >&2
+fi
+
+echo "prebuild: wrote $OUTPUT ($(du -h "$OUTPUT" | cut -f1), sha=$have)"

arch/linux-fresnel-fourier/0004-media-videobuf2-add-opt-in-dma_resv-producer-fence-h.patch

@@ -0,0 +1,356 @@
+From a202de1646d4c8f8ee2ebc2e4c100b621975754a Mon Sep 17 00:00:00 2001
+In-Reply-To: <20260429195306.239666-1-mfritsche@reauktion.de>
+References: <20260429195306.239666-1-mfritsche@reauktion.de>
+From: Markus Fritsche <mfritsche@reauktion.de>
+Date: Sat, 9 May 2026 16:16:07 +0200
+Subject: [PATCH RFC v2] media: videobuf2: add opt-in dma_resv producer fence
+ helper
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+V4L2 producers historically don't propagate buffer-state-done into
+the dmabuf's dma_resv exclusive fence. Userspace consumers that
+import V4L2-produced dmabufs and wait on the dmabuf's implicit-sync
+fence (poll(POLLIN), DMA_BUF_IOCTL_EXPORT_SYNC_FILE,
+EGL_LINUX_DMA_BUF_EXT) currently see either zero fences or a stub
+fence from dma_fence_get_stub(). This is correct by accident for the
+common DQBUF-then-import case but represents a contract gap that
+breaks Wayland compositors importing CAPTURE buffers from a stateless
+H.264 decoder under continuous playback on implicit-sync GPU stacks
+(observed on RK3566 + hantro VPU + Mali-G52 panfrost; manifests as
+green frames -- BT.709 limited-range YUV(0,0,0) -> RGB(0,77,0) -- when
+the GPU samples the dmabuf before the producer's decode completes).
+
+Add an opt-in API gated by both a per-driver runtime flag
+(vb2_queue::supports_release_fences) and a Kconfig
+(CONFIG_VIDEOBUF2_RELEASE_FENCES, default n) that lets producers
+populate a real dma_resv exclusive write fence on the dmabufs they
+export. Drivers call vb2_buffer_attach_release_fence(vb) at a
+finite-time-fenced point in their pipeline (typically m2m
+device_run, just before the HW kick); vb2_buffer_done() signals and
+puts the fence as part of its state transition.
+
+The publish and signal paths are wrapped in
+dma_fence_begin_signalling() / dma_fence_end_signalling() so
+PROVE_LOCKING can validate that nothing taken in those critical
+sections deadlocks against the signal path. dma_resv_lock is
+sleepable but not taken on the signal path, so taking it inside the
+publish critical section is safe under lockdep.
+
+Skips planes whose vb2_plane.dbuf is NULL -- buffers never exported
+via VIDIOC_EXPBUF (or imported via V4L2_MEMORY_DMABUF) have no
+dmabuf for userspace to wait on.
+
+Drivers that don't opt in pay nothing: the helper is a no-op stub
+when CONFIG_VIDEOBUF2_RELEASE_FENCES=n, and an early-return check
+of supports_release_fences when =y but the flag is unset.
+
+Validated on RK3566 PineTab2 with PROVE_LOCKING enabled: 30s of
+bbb_1080p30 H.264 stateless decode + zero-copy panfrost EGL import
+via dmabuf-wayland (mpv 0.41 + KWin 6.6.4 + Mesa panfrost 26.0.5)
+produces 31,816 dma_fence init/signal pairs across 5,724 vb2 buffer
+cycles with zero lockdep splats from videobuf2 / dma_resv code paths.
+
+Subsequent patches in this series opt the hantro and rockchip-rga
+drivers in.
+
+Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
+Cc: Christian König <christian.koenig@amd.com>
+Cc: Nicolas Dufresne <nicolas@ndufresne.ca>
+Cc: Sumit Semwal <sumit.semwal@linaro.org>
+Cc: Hans Verkuil <hverkuil@xs4all.nl>
+Cc: Tomasz Figa <tfiga@chromium.org>
+Cc: linux-media@vger.kernel.org
+Cc: dri-devel@lists.freedesktop.org
+Cc: linaro-mm-sig@lists.linaro.org
+Signed-off-by: Markus Fritsche <mfritsche@reauktion.de>
+---
+ drivers/media/common/videobuf2/Kconfig        |  29 ++++
+ .../media/common/videobuf2/videobuf2-core.c   | 135 ++++++++++++++++++
+ include/media/videobuf2-core.h                |  51 +++++++
+ 3 files changed, 215 insertions(+)
+
+diff --git a/drivers/media/common/videobuf2/Kconfig b/drivers/media/common/videobuf2/Kconfig
+index d2223a12c..bbfa26984 100644
+--- a/drivers/media/common/videobuf2/Kconfig
++++ b/drivers/media/common/videobuf2/Kconfig
+@@ -30,3 +30,32 @@ config VIDEOBUF2_DMA_SG
+ config VIDEOBUF2_DVB
+ 	tristate
+ 	select VIDEOBUF2_CORE
++
++config VIDEOBUF2_RELEASE_FENCES
++	bool "videobuf2: opt-in dma_resv producer fences for V4L2 dmabuf exports"
++	depends on VIDEOBUF2_CORE
++	depends on DMA_SHARED_BUFFER
++	default n
++	help
++	  Enables an opt-in API that lets vb2 producers populate a dma_resv
++	  exclusive write fence on the dmabufs they export to userspace.
++	  The fence is signalled when the buffer transitions to
++	  VB2_BUF_STATE_DONE.
++
++	  This gives userspace consumers that import V4L2-produced dmabufs
++	  and wait on the dmabuf's implicit-sync fence (poll(POLLIN),
++	  DMA_BUF_IOCTL_EXPORT_SYNC_FILE, EGL_LINUX_DMA_BUF_EXT) a real
++	  producer fence to wait on, instead of a stub fence from
++	  dma_fence_get_stub() that the dma_buf core substitutes when
++	  dma_resv is empty.
++
++	  Drivers individually opt in by setting
++	  vb2_queue::supports_release_fences = true and calling
++	  vb2_buffer_attach_release_fence() at the right point in their
++	  pipeline (typically m2m device_run, just before HW kick).
++
++	  Distributors leave this off unless targeting Wayland/EGL
++	  consumers of V4L2 stateless decoder output on
++	  implicit-sync-only GPU stacks (e.g. mainline panfrost).
++
++	  If unsure, say N.
+diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
+index adf668b21..85d7fddbd 100644
+--- a/drivers/media/common/videobuf2/videobuf2-core.c
++++ b/drivers/media/common/videobuf2/videobuf2-core.c
+@@ -26,6 +26,12 @@
+ #include <linux/freezer.h>
+ #include <linux/kthread.h>
+ 
++#ifdef CONFIG_VIDEOBUF2_RELEASE_FENCES
++#include <linux/dma-fence.h>
++#include <linux/dma-resv.h>
++#include <linux/dma-buf.h>
++#endif
++
+ #include <media/videobuf2-core.h>
+ #include <media/v4l2-mc.h>
+ 
+@@ -1173,6 +1179,120 @@ void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no)
+ }
+ EXPORT_SYMBOL_GPL(vb2_plane_cookie);
+ 
++#ifdef CONFIG_VIDEOBUF2_RELEASE_FENCES
++/*
++ * dma_resv release-fence integration.
++ *
++ * Optional, opt-in path that lets producers publish a real
++ * dma_fence on their CAPTURE-side dmabufs so userspace consumers
++ * (compositors, EGL importers) get spec-clean implicit-sync
++ * semantics instead of the dma_buf core's stub fence. Drivers
++ * call vb2_buffer_attach_release_fence() at a finite-time-fenced
++ * point (typically m2m device_run) and the fence is signalled by
++ * vb2_buffer_done(). Gated at runtime by
++ * vb2_queue::supports_release_fences and at compile time by
++ * CONFIG_VIDEOBUF2_RELEASE_FENCES.
++ */
++
++static const char *vb2_dma_resv_get_driver_name(struct dma_fence *fence)
++{
++	return "videobuf2";
++}
++
++static const char *vb2_dma_resv_get_timeline_name(struct dma_fence *fence)
++{
++	return "vb2-release-fence";
++}
++
++static const struct dma_fence_ops vb2_dma_resv_fence_ops = {
++	.get_driver_name = vb2_dma_resv_get_driver_name,
++	.get_timeline_name = vb2_dma_resv_get_timeline_name,
++};
++
++int vb2_buffer_attach_release_fence(struct vb2_buffer *vb)
++{
++	struct vb2_queue *q = vb->vb2_queue;
++	struct dma_fence *fence;
++	unsigned int plane;
++	bool cookie;
++
++	if (!q->supports_release_fences)
++		return 0;
++
++	if (WARN_ON(vb->release_fence))
++		return -EINVAL;
++
++	fence = kzalloc(sizeof(*fence), GFP_KERNEL);
++	if (!fence)
++		return -ENOMEM;
++
++	dma_fence_init(fence, &vb2_dma_resv_fence_ops, &q->dma_resv_fence_lock,
++		       q->dma_resv_fence_context,
++		       atomic64_inc_return(&q->dma_resv_fence_seqno));
++
++	/*
++	 * Annotate the publish-side critical section. Per
++	 * Documentation/driver-api/dma-buf.rst, lockdep validates
++	 * that nothing taken in this region can deadlock against
++	 * the signal path in vb2_buffer_signal_release_fence().
++	 * dma_resv_lock is sleepable but is not taken on the signal
++	 * path, so taking it inside the critical section is safe.
++	 */
++	cookie = dma_fence_begin_signalling();
++	for (plane = 0; plane < vb->num_planes; plane++) {
++		struct dma_buf *dbuf = vb->planes[plane].dbuf;
++
++		if (!dbuf)
++			continue;
++
++		dma_resv_lock(dbuf->resv, NULL);
++		dma_resv_add_fence(dbuf->resv, fence, DMA_RESV_USAGE_WRITE);
++		dma_resv_unlock(dbuf->resv);
++	}
++	dma_fence_end_signalling(cookie);
++
++	/* One reference for the eventual signal in vb2_buffer_done. */
++	vb->release_fence = dma_fence_get(fence);
++
++	/* The dma_resv held its own reference per plane. Drop ours. */
++	dma_fence_put(fence);
++
++	return 0;
++}
++EXPORT_SYMBOL_GPL(vb2_buffer_attach_release_fence);
++
++static void vb2_buffer_signal_release_fence(struct vb2_buffer *vb,
++					    enum vb2_buffer_state state)
++{
++	struct dma_fence *fence = vb->release_fence;
++	bool cookie;
++
++	if (!fence)
++		return;
++
++	cookie = dma_fence_begin_signalling();
++	if (state == VB2_BUF_STATE_ERROR)
++		dma_fence_set_error(fence, -EIO);
++	dma_fence_signal(fence);
++	dma_fence_end_signalling(cookie);
++
++	dma_fence_put(fence);
++	vb->release_fence = NULL;
++}
++#else /* !CONFIG_VIDEOBUF2_RELEASE_FENCES */
++
++int vb2_buffer_attach_release_fence(struct vb2_buffer *vb)
++{
++	return 0;
++}
++EXPORT_SYMBOL_GPL(vb2_buffer_attach_release_fence);
++
++static inline void vb2_buffer_signal_release_fence(struct vb2_buffer *vb,
++						   enum vb2_buffer_state state)
++{
++}
++#endif /* CONFIG_VIDEOBUF2_RELEASE_FENCES */
++
+ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
+ {
+ 	struct vb2_queue *q = vb->vb2_queue;
+@@ -1199,6 +1319,9 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
+ 	if (state != VB2_BUF_STATE_QUEUED)
+ 		__vb2_buf_mem_finish(vb);
+ 
++	if (state != VB2_BUF_STATE_QUEUED)
++		vb2_buffer_signal_release_fence(vb, state);
++
+ 	spin_lock_irqsave(&q->done_lock, flags);
+ 	if (state == VB2_BUF_STATE_QUEUED) {
+ 		vb->state = VB2_BUF_STATE_QUEUED;
+@@ -2651,6 +2774,18 @@ int vb2_core_queue_init(struct vb2_queue *q)
+ 	mutex_init(&q->mmap_lock);
+ 	init_waitqueue_head(&q->done_wq);
+ 
++#ifdef CONFIG_VIDEOBUF2_RELEASE_FENCES
++	/*
++	 * Per-queue dma_resv release-fence context. Drivers that
++	 * opt in via supports_release_fences and call
++	 * vb2_buffer_attach_release_fence() use these to allocate
++	 * fences on a single per-queue timeline.
++	 */
++	q->dma_resv_fence_context = dma_fence_context_alloc(1);
++	atomic64_set(&q->dma_resv_fence_seqno, 0);
++	spin_lock_init(&q->dma_resv_fence_lock);
++#endif
++
+ 	q->memory = VB2_MEMORY_UNKNOWN;
+ 
+ 	if (q->buf_struct_size == 0)
+diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
+index 4424d481d..766ff2194 100644
+--- a/include/media/videobuf2-core.h
++++ b/include/media/videobuf2-core.h
+@@ -288,6 +288,16 @@ struct vb2_buffer {
+ 	unsigned int		skip_cache_sync_on_finish:1;
+ 
+ 	struct vb2_plane	planes[VB2_MAX_PLANES];
++#ifdef CONFIG_VIDEOBUF2_RELEASE_FENCES
++	/*
++	 * Producer release fence published on each plane's
++	 * dmabuf->resv when the driver opts in via
++	 * vb2_buffer_attach_release_fence(). Signalled and put by
++	 * vb2_buffer_done() on transition to DONE/ERROR. NULL when
++	 * the driver did not opt in for this buffer.
++	 */
++	struct dma_fence	*release_fence;
++#endif
+ 	struct list_head	queued_entry;
+ 	struct list_head	done_entry;
+ #ifdef CONFIG_VIDEO_ADV_DEBUG
+@@ -648,6 +658,19 @@ struct vb2_queue {
+ 	spinlock_t			done_lock;
+ 	wait_queue_head_t		done_wq;
+ 
++#ifdef CONFIG_VIDEOBUF2_RELEASE_FENCES
++	/*
++	 * dma_resv release-fence context. Drivers that set
++	 * supports_release_fences and call
++	 * vb2_buffer_attach_release_fence() use these to allocate
++	 * fences on a per-queue timeline.
++	 */
++	u64				dma_resv_fence_context;
++	atomic64_t			dma_resv_fence_seqno;
++	spinlock_t			dma_resv_fence_lock;
++#endif
++
++	unsigned int			supports_release_fences:1;
+ 	unsigned int			streaming:1;
+ 	unsigned int			start_streaming_called:1;
+ 	unsigned int			error:1;
+@@ -735,6 +758,34 @@ void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no);
+  */
+ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state);
+ 
++/**
++ * vb2_buffer_attach_release_fence() - opt-in dma_resv release fence.
++ * @vb: the buffer being committed to the producer.
++ *
++ * Drivers that have set vb2_queue::supports_release_fences may call
++ * this from any sleepable context where they have committed to
++ * running the operation in finite time -- typically m2m
++ * device_run(), just before the HW kick. The helper allocates a
++ * dma_fence on the queue's per-queue timeline, attaches it as
++ * DMA_RESV_USAGE_WRITE on each plane's dmabuf->resv, and stashes
++ * it in vb->release_fence. vb2_buffer_done() signals and puts the
++ * fence as part of the buffer's state transition.
++ *
++ * Skips planes whose vb2_plane.dbuf is NULL -- buffers never
++ * exported via VIDIOC_EXPBUF (or imported via V4L2_MEMORY_DMABUF)
++ * have no dmabuf for userspace to wait on.
++ *
++ * No-op when vb2_queue::supports_release_fences is not set
++ * (regardless of CONFIG_VIDEOBUF2_RELEASE_FENCES). When
++ * CONFIG_VIDEOBUF2_RELEASE_FENCES=n, this is a stub that returns 0.
++ *
++ * Returns 0 on success or when the no-op stub is in effect,
++ * negative errno on allocation failure when fence publishing was
++ * attempted. Best-effort: drivers should ignore the return value
++ * unless they want diagnostics.
++ */
++int vb2_buffer_attach_release_fence(struct vb2_buffer *vb);
++
+ /**
+  * vb2_discard_done() - discard all buffers marked as DONE.
+  * @q:		pointer to &struct vb2_queue with videobuf2 queue.
+-- 
+2.53.0
+

arch/linux-fresnel-fourier/0005-media-hantro-attach-dma_resv-release-fence-at-device.patch

@@ -0,0 +1,95 @@
+From 1844c263bde8dd244d7db46f8c508e7c70da459c Mon Sep 17 00:00:00 2001
+In-Reply-To: <20260429195306.239666-1-mfritsche@reauktion.de>
+References: <20260429195306.239666-1-mfritsche@reauktion.de>
+From: Markus Fritsche <mfritsche@reauktion.de>
+Date: Sat, 9 May 2026 16:24:01 +0200
+Subject: [PATCH RFC v2] media: hantro: attach dma_resv release fence at
+ device_run
+
+Opt the hantro driver into the new vb2 release-fence helper so its
+CAPTURE-side dmabufs carry a real producer fence that wayland
+compositors and other implicit-sync consumers can wait on, instead
+of the dma_buf core's stub fence.
+
+Attach point is m2m device_run, immediately after
+v4l2_m2m_buf_copy_metadata() and before ctx->codec_ops->run().
+Per Nicolas Dufresne's v1 review (lore.kernel.org/linux-media/
+3d8deeb15581b754e4c061d4c4a13657aa08bc3c.camel@ndufresne.ca/),
+this satisfies the dma_fence finite-time contract: the m2m core
+has committed to running the job by this point, codec_ops->run
+either kicks the HW (decode-complete signals the fence via
+vb2_buffer_done) or fails immediately (job_finish with
+VB2_BUF_STATE_ERROR signals with -EIO). PM and clocks are already
+up by this point, so no allocation context restrictions.
+
+The CAPTURE queue is opted in with supports_release_fences=true at
+queue_init.
+
+Userspace consumers that import hantro CAPTURE dmabufs and wait on
+their implicit-sync fence (Wayland zwp_linux_dmabuf_v1 +
+panfrost EGL_LINUX_DMA_BUF_EXT) now wait on a real fence
+representing the producer's actual completion, fixing green-frame
+corruption observed on RK3566 PineTab2 + Mali-G52 panfrost (the
+GPU was sampling zero pages because the dmabuf's implicit fence
+was the dma_buf core's pre-signalled stub).
+
+Validated end-to-end on PineTab2 (RK3566 / hantro G1 / Mali-G52
+mainline panfrost): 30s of bbb_1080p30 H.264 stateless decode +
+zero-copy panfrost EGL import via dmabuf-wayland (mpv 0.41 +
+KWin 6.6.4 + Mesa panfrost 26.0.5) renders correctly with no
+green-frame corruption and no PROVE_LOCKING splats.
+
+Cc: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
+Cc: Philipp Zabel <p.zabel@pengutronix.de>
+Cc: Nicolas Dufresne <nicolas@ndufresne.ca>
+Cc: linux-media@vger.kernel.org
+Cc: linux-rockchip@lists.infradead.org
+Signed-off-by: Markus Fritsche <mfritsche@reauktion.de>
+---
+ .../media/platform/verisilicon/hantro_drv.c   | 23 +++++++++++++++++++
+ 1 file changed, 23 insertions(+)
+
+diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
+index 2e81877f6..6a66c47ed 100644
+--- a/drivers/media/platform/verisilicon/hantro_drv.c
++++ b/drivers/media/platform/verisilicon/hantro_drv.c
+@@ -186,6 +186,22 @@ static void device_run(void *priv)
+ 
+ 	v4l2_m2m_buf_copy_metadata(src, dst);
+ 
++	/*
++	 * Attach a producer fence on the CAPTURE-side dmabuf so userspace
++	 * importers (e.g. Wayland compositors) get spec-clean implicit-sync
++	 * semantics. Called from device_run rather than buf_queue: the
++	 * dma_fence finite-time contract requires that once a fence is
++	 * published, the producer must signal it in finite time. By the
++	 * time we reach device_run, the m2m core has committed to running
++	 * this job, and the next hop (codec_ops->run) either kicks the HW
++	 * (decode-complete signals the fence via vb2_buffer_done) or
++	 * fails immediately (job_finish with VB2_BUF_STATE_ERROR signals
++	 * the fence with -EIO). Either path resolves the fence in finite
++	 * time. Best-effort: a NOMEM here means we lose implicit-sync
++	 * precision for this frame, no functional regression.
++	 */
++	(void)vb2_buffer_attach_release_fence(&dst->vb2_buf);
++
+ 	if (ctx->codec_ops->run(ctx))
+ 		goto err_cancel_job;
+ 
+@@ -249,6 +265,13 @@ queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
+ 	dst_vq->lock = &ctx->dev->vpu_mutex;
+ 	dst_vq->dev = ctx->dev->v4l2_dev.dev;
+ 
++	/*
++	 * Opt the CAPTURE queue into vb2 release-fence publishing.
++	 * No-op unless CONFIG_VIDEOBUF2_RELEASE_FENCES=y; runtime cost
++	 * is one extra fence allocation + dma_resv update per device_run.
++	 */
++	dst_vq->supports_release_fences = true;
++
+ 	return vb2_queue_init(dst_vq);
+ }
+ 
+-- 
+2.53.0
+

arch/linux-fresnel-fourier/0006-media-rockchip-rga-attach-dma_resv-release-fence-at-.patch

@@ -0,0 +1,117 @@
+From 2c63a63bf65739763051dc4ce7ce2ffaf2d514c4 Mon Sep 17 00:00:00 2001
+In-Reply-To: <20260429195306.239666-1-mfritsche@reauktion.de>
+References: <20260429195306.239666-1-mfritsche@reauktion.de>
+From: Markus Fritsche <mfritsche@reauktion.de>
+Date: Sat, 9 May 2026 16:50:51 +0200
+Subject: [PATCH RFC v2] media: rockchip-rga: attach dma_resv release fence at
+ device_run
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Opt the rockchip-rga driver into the new vb2 release-fence helper.
+
+Same shape as the hantro patch: attach a producer fence on the
+CAPTURE-side dmabuf at m2m device_run, signalled by
+vb2_buffer_done() when RGA completes the m2m operation.
+
+Differs from hantro in one mechanical detail: rga's device_run
+wraps the entire body in spin_lock_irqsave(&rga->ctrl_lock). Our
+helper calls dma_resv_lock(), which is sleepable, so the
+buffer-fetch + fence-attach sequence has to run above the spinlock.
+Restructure device_run so:
+
+  - v4l2_m2m_next_src_buf / next_dst_buf,
+  - src->sequence increment,
+  - vb2_buffer_attach_release_fence(&dst->vb2_buf)
+
+run before spin_lock_irqsave; only the rga->curr assignment and
+rga_hw_start() (the actual HW kick) remain inside the spinlock.
+
+This is safe under the m2m-job ownership model: by the time
+device_run is called, the m2m core has selected this context and
+serializes one device_run per context, so v4l2_m2m_next_*_buf
+returns stable pointers until the corresponding *_buf_remove in
+rga_isr. ctrl_lock was previously protecting per-device state
+(rga->curr) and the HW register access, neither of which depends on
+the buffer-fetch happening inside the lock.
+
+The CAPTURE queue is opted in with supports_release_fences=true at
+queue_init.
+
+Userspace consumers of RGA-produced dmabufs (image-processing
+pipelines, screen-rotation servers, gstreamer flows on Rockchip
+boards) get spec-clean implicit-sync semantics, matching what
+hantro does in the previous patch in this series.
+
+Sven Püschel's ongoing "media: platform: rga: Add RGA3 support"
+v5 series (linux-rockchip 2026-04-28) restructures rga.c
+substantially. If that lands first, the device_run restructure
+here will need a rebase against the new shape; the locking story
+itself is invariant.
+
+Cc: Jacob Chen <jacob-chen@iotwrt.com>
+Cc: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
+Cc: Sven Püschel <s.pueschel@pengutronix.de>
+Cc: Heiko Stuebner <heiko@sntech.de>
+Cc: Hans Verkuil <hverkuil@xs4all.nl>
+Cc: linux-media@vger.kernel.org
+Cc: linux-rockchip@lists.infradead.org
+Signed-off-by: Markus Fritsche <mfritsche@reauktion.de>
+---
+ drivers/media/platform/rockchip/rga/rga.c | 27 +++++++++++++++++++----
+ 1 file changed, 23 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/media/platform/rockchip/rga/rga.c b/drivers/media/platform/rockchip/rga/rga.c
+index fea63b94c..03030c7ea 100644
+--- a/drivers/media/platform/rockchip/rga/rga.c
++++ b/drivers/media/platform/rockchip/rga/rga.c
+@@ -38,15 +38,28 @@ static void device_run(void *prv)
+ 	struct vb2_v4l2_buffer *src, *dst;
+ 	unsigned long flags;
+ 
+-	spin_lock_irqsave(&rga->ctrl_lock, flags);
+-
+-	rga->curr = ctx;
+-
++	/*
++	 * Fetch the next-job buffers and (best-effort) attach a producer
++	 * fence on CAPTURE before taking ctrl_lock below.
++	 * vb2_buffer_attach_release_fence() takes dma_resv_lock, which is
++	 * sleepable; ctrl_lock is taken with spin_lock_irqsave so any
++	 * sleepable call must happen above it. Buffer ownership is
++	 * already committed at this point: the m2m core has selected
++	 * this context for device_run and serializes one device_run per
++	 * context, so v4l2_m2m_next_*_buf returns stable pointers until
++	 * the corresponding *_buf_remove in rga_isr.
++	 */
+ 	src = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
+ 	src->sequence = ctx->osequence++;
+ 
+ 	dst = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
+ 
++	(void)vb2_buffer_attach_release_fence(&dst->vb2_buf);
++
++	spin_lock_irqsave(&rga->ctrl_lock, flags);
++
++	rga->curr = ctx;
++
+ 	rga_hw_start(rga, vb_to_rga(src), vb_to_rga(dst));
+ 
+ 	spin_unlock_irqrestore(&rga->ctrl_lock, flags);
+@@ -123,6 +136,12 @@ queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
+ 	dst_vq->lock = &ctx->rga->mutex;
+ 	dst_vq->dev = ctx->rga->v4l2_dev.dev;
+ 
++	/*
++	 * Opt the CAPTURE queue into vb2 release-fence publishing.
++	 * Compile-time gated by CONFIG_VIDEOBUF2_RELEASE_FENCES.
++	 */
++	dst_vq->supports_release_fences = true;
++
+ 	return vb2_queue_init(dst_vq);
+ }
+ 
+-- 
+2.53.0
+

arch/linux-fresnel-fourier/PKGBUILD

@@ -10,8 +10,8 @@
 pkgbase=linux-fresnel-fourier
 pkgname=("$pkgbase" "$pkgbase-headers")
 pkgver=7.0
-pkgrel=1
-pkgdesc='Pinebook Pro kernel (mmind/linux-rockchip v7.0 + OC OPP + PBP DTS tweaks)'
+pkgrel=14
+pkgdesc='Pinebook Pro kernel (mmind/linux-rockchip v7.0 + OC OPP + PBP DTS tweaks + vb2_dma_resv RFC v2)'
 arch=(aarch64)
 url='https://git.reauktion.de/marfrit/kernel-agent'
 license=(GPL-2.0-only)
@@ -23,15 +23,20 @@ makedepends=(
 options=('!strip')
 source=(
   "https://git.kernel.org/torvalds/t/linux-${pkgver}.tar.gz"
+  # board/pinebook-pro
   '0001-arm64-dts-rk3399-pinebook-pro-add-OC-OPP-tables-1704-2184.patch'
   '0002-arm64-dts-rk3399-pinebook-pro-enable-hdmi-sound.patch'
   '0003-arm64-dts-rk3399-pinebook-pro-spi1-max-freq-10MHz.patch'
+  # subsystem/media/videobuf2/dma-resv-release-fence (RFC v2, in kernel-agent)
+  '0004-media-videobuf2-add-opt-in-dma_resv-producer-fence-h.patch'
+  '0005-media-hantro-attach-dma_resv-release-fence-at-device.patch'
+  '0006-media-rockchip-rga-attach-dma_resv-release-fence-at-.patch'
   'config'  # snapshot of fresnel /usr/lib/modules/6.19.10-1-eos-arm/build/.config
   'linux-fresnel-fourier.preset'
   'extlinux-add.hook'
   'extlinux-add.sh'
 )
-sha256sums=('SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP')
+sha256sums=('SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP')
 
 _kernver=${pkgver}.0-fresnel-fourier
 _srcdir=linux-${pkgver}

arch/lmcp/PKGBUILD

@@ -3,15 +3,18 @@
 # Source of truth: git.reauktion.de/marfrit/lmcp
 
 pkgname=lmcp
-pkgver=0.5.4
+pkgver=1.2.1
 pkgrel=1
 pkgdesc="Lightweight MCP (Model Context Protocol) server in pure Lua"
 arch=('any')
 url="https://git.reauktion.de/marfrit/lmcp"
 license=('MIT')
 depends=('lua' 'lua-socket')
-source=("${pkgname}-${pkgver}.tar.gz::https://git.reauktion.de/marfrit/lmcp/archive/v${pkgver}.tar.gz")
-sha256sums=('af72b8c1d88255456b75d2c53cd5c451a8923417e5498ef31858539397e09caf')
+# The _tag back-translation handles both clean releases (no '_') and
+# pre-release pkgvers (e.g. 1.2.0_rc1 → v1.2.0-rc1).
+_tag="v${pkgver//_/-}"
+source=("${pkgname}-${pkgver}.tar.gz::https://git.reauktion.de/marfrit/lmcp/archive/${_tag}.tar.gz")
+sha256sums=('bf9cce1a84c66b1b74c5aec923c5960d60ae33c221afc8d47ce0d74b8f7ee609')
 
 package() {
     cd "${pkgname}"

arch/qt6-base-fourier/PKGBUILD

@@ -21,14 +21,14 @@
 # pkgbase stays as qt6-base so $_pkgfn (= ${pkgbase/6-/} = "qtbase")
 # resolves correctly. The "-fourier" suffix lives only in the
 # directory name and the commit history; epoch=1 gives our local
-# build strict precedence over upstream pkgrel=2 until upstream lands
+# build strict precedence over upstream pkgrel=N until upstream lands
 # the GL_R8/ES3 fix and we can drop the epoch.
 pkgbase=qt6-base
 pkgname=(qt6-base-fourier
          qt6-xcb-private-headers-fourier)
-_pkgver=6.11.0
+_pkgver=6.11.1
 pkgver=${_pkgver/-/}
-pkgrel=3
+pkgrel=1
 epoch=1
 arch=(aarch64 x86_64)
 url='https://www.qt.io'
@@ -42,7 +42,6 @@ depends=(brotli
          double-conversion
          fontconfig
          freetype2
-         gcc-libs
          glib2
          glibc
          harfbuzz
@@ -51,6 +50,7 @@ depends=(brotli
          libb2
          libcups
          libdrm
+         libgcc
          libgl
          libice
          libinput
@@ -58,6 +58,7 @@ depends=(brotli
          libpng
          libproxy
          libsm
+         libstdc++
          liburing
          libx11
          libxcb
@@ -115,7 +116,7 @@ source=(git+https://code.qt.io/qt/$_pkgfn#tag=v$_pkgver
         0001-qopengltextureglyphcache-pick-GL_R8-on-ES3.patch
         0002-qrhigles2-RED_OR_ALPHA8-pick-GL_R8-on-ES3.patch
         0003-qopengltextureuploader-pick-GL_R8-on-ES3.patch)
-sha256sums=('2223c075e95d86f8dbf6395b025a74d996c418f094453c903290e3c2663fbed2'
+sha256sums=('2eafe504fae873d20f206b5661e2e10506879455cb2d370f42c5bb72ccf7a8a1'
             '5411edbe215c24b30448fac69bd0ba7c882f545e8cf05027b2b6e2227abc5e78'
             '4b93f6a79039e676a56f9d6990a324a64a36f143916065973ded89adc621e094'
             'SKIP'
@@ -126,9 +127,8 @@ prepare() {
   patch -d $_pkgfn -p1 < qt6-base-cflags.patch # Use system CFLAGS
   patch -d $_pkgfn -p1 < qt6-base-nostrip.patch # Don't strip binaries with qmake
 
-  # cherry-pick needs git author identity; git-cli refuses without it.
-  git -C $_pkgfn -c user.email=fourier@build -c user.name='qt6-base-fourier build' \
-      cherry-pick -n 8b54513cdcf62047376a5d27d784ad68a8f235bf # Fix qdbus crashes
+  # 8b54513cdcf6 (qdbus crash fix) cherry-pick removed: landed upstream
+  # in 6.11.1. Re-add if qdbus regressions re-surface.
 
   # qt6-base-fourier — three small runtime-checks that pick GL_R8 over
   # GL_ALPHA when the live GL context is ES 3 or newer. See the
@@ -165,7 +165,7 @@ build() {
     -DFEATURE_system_sqlite=ON \
     -DFEATURE_system_xcb_xinput=ON \
     -DFEATURE_no_direct_extern_access=$_no_direct_extern_access \
-    -DFEATURE_sql_ibase=OFF \
+    -DFEATURE_mimetype_database=OFF \
     -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON \
     -DCMAKE_MESSAGE_LOG_LEVEL=STATUS
   cmake --build build

debian/daedalus-v4l2-dkms/build-deb.sh

@@ -0,0 +1,174 @@
+#!/bin/bash
+# Build daedalus-v4l2-dkms_<ver>_all.deb (kernel module via DKMS).
+#
+# Installs kernel/ source tree to /usr/src/daedalus_v4l2-${PKGVER}/
+# plus a dkms.conf.  Postinst registers with DKMS (dkms add + build +
+# install).  Prerm deregisters.  Result: the daedalus_v4l2 module
+# auto-rebuilds against any installed kernel headers without users
+# needing to remember to dkms-add it.
+#
+# Architecture: all.  The kernel module itself is per-kernel-version,
+# but the SOURCE package is arch-independent.
+#
+# Sibling Arch package: ../../arch/daedalus-v4l2-dkms/PKGBUILD
+# Sibling userspace package: ../daedalus-v4l2/build-deb.sh
+set -euo pipefail
+
+UPSTREAM_COMMIT=f55b2cdab8a8c0bc04e8c1bb1d0b6ca85e7d96d2
+PKGVER=0.1.0+r16+gf55b2cd
+PKGREL=1
+MODULE_NAME=daedalus_v4l2
+
+HERE=$(dirname "$(readlink -f "$0")")
+
+# Reproducible build.  2026-05-18 23:00 UTC — Phase 8.13 close.
+export SOURCE_DATE_EPOCH=1779231600
+
+work=$(mktemp -d)
+trap "rm -rf $work" EXIT
+
+cd "$work"
+curl -sSLfo daedalus-v4l2.tar.gz \
+    "https://git.reauktion.de/reauktion/daedalus-v4l2/archive/${UPSTREAM_COMMIT}.tar.gz"
+tar xzf daedalus-v4l2.tar.gz
+SRCDIR=daedalus-v4l2
+
+ROOT="$work/pkgroot"
+SRCROOT="$ROOT/usr/src/${MODULE_NAME}-${PKGVER}"
+
+mkdir -p "$SRCROOT/include" \
+         "$ROOT/DEBIAN" \
+         "$ROOT/usr/share/doc/daedalus-v4l2-dkms"
+
+# Copy kernel/ source files to the DKMS source dir.
+cp -r "$work/$SRCDIR/kernel/." "$SRCROOT/"
+
+# Embed the shared protocol header inline (rather than referencing
+# ../include/ which doesn't exist after DKMS extracts the tree).
+# Patch the Makefile to find it at $SRCROOT/include/ instead.
+install -m 644 "$work/$SRCDIR/include/daedalus_v4l2_proto.h" \
+    "$SRCROOT/include/daedalus_v4l2_proto.h"
+sed -i 's|-I\$(src)/\.\./include|-I$(src)/include|' "$SRCROOT/Makefile"
+
+# Generate dkms.conf with the actual version substituted.
+cat > "$SRCROOT/dkms.conf" <<EOF
+PACKAGE_NAME="${MODULE_NAME}"
+PACKAGE_VERSION="${PKGVER}"
+
+BUILT_MODULE_NAME[0]="${MODULE_NAME}"
+DEST_MODULE_LOCATION[0]="/updates"
+
+MAKE[0]="make KERNELDIR=/lib/modules/\${kernelver}/build all"
+CLEAN="make KERNELDIR=/lib/modules/\${kernelver}/build clean"
+
+AUTOINSTALL="yes"
+EOF
+
+# Doc
+install -m 644 "$work/$SRCDIR/README.md" \
+    "$ROOT/usr/share/doc/daedalus-v4l2-dkms/README.md"
+install -Dm644 "$HERE/debian/copyright" "$ROOT/usr/share/doc/daedalus-v4l2-dkms/copyright"
+install -Dm644 "$HERE/debian/changelog" "$ROOT/usr/share/doc/daedalus-v4l2-dkms/changelog.Debian"
+gzip -9 -n "$ROOT/usr/share/doc/daedalus-v4l2-dkms/changelog.Debian"
+
+# DKMS post-install / pre-remove hooks.
+cat > "$ROOT/DEBIAN/postinst" <<EOF
+#!/bin/sh
+set -e
+
+NAME=${MODULE_NAME}
+VERSION=${PKGVER}
+KERNELVER=\$(uname -r)
+
+# Yellow + bold ANSI for the warning so it stands out in apt's
+# stream of "Setting up" lines.  Disable colour on non-TTY.
+if [ -t 1 ]; then
+    Y=\$(printf '\\033[1;33m'); R=\$(printf '\\033[0m')
+else
+    Y=''; R=''
+fi
+
+warn() {
+    printf '%s==> daedalus-v4l2-dkms: %s%s\\n' "\$Y" "\$1" "\$R" >&2
+}
+
+if [ "\$1" = "configure" ]; then
+    if ! command -v dkms >/dev/null 2>&1; then
+        warn "dkms not installed; module \$NAME/\$VERSION not registered."
+        warn "Install 'dkms' then run: dkms add \$NAME/\$VERSION && dkms autoinstall"
+        exit 0
+    fi
+
+    dkms add "\$NAME/\$VERSION" 2>/dev/null || true
+
+    # Don't let autoinstall failure mask the actual problem behind '|| true'.
+    # Run it, capture the result, then verify post-condition.
+    autoinstall_rc=0
+    dkms autoinstall "\$NAME/\$VERSION" || autoinstall_rc=\$?
+
+    # Verify the module actually built + installed for the running kernel.
+    status=\$(dkms status -m "\$NAME" -v "\$VERSION" -k "\$KERNELVER" 2>/dev/null || true)
+    if ! printf '%s\\n' "\$status" | grep -q -E 'installed|loaded'; then
+        warn ""
+        warn "DKMS build did NOT land for kernel \$KERNELVER."
+        warn "  dkms status -m \$NAME -v \$VERSION -k \$KERNELVER:"
+        warn "    \$(printf '%s' "\$status" | head -1)"
+        warn ""
+        warn "Most likely cause: kernel headers package is missing."
+        warn "  Raspberry Pi OS / Pi 5:  apt install linux-headers-rpi-2712"
+        warn "  Debian generic:          apt install linux-headers-\$KERNELVER"
+        warn ""
+        warn "After installing headers, finish the install with:"
+        warn "  sudo dkms autoinstall \$NAME/\$VERSION"
+        warn "  sudo modprobe daedalus_v4l2"
+        warn ""
+        warn "Until then daedalus_v4l2 will NOT be loadable and the"
+        warn "userspace daedalus-v4l2 daemon will have nothing to talk to."
+    fi
+fi
+
+#DEBHELPER#
+EOF
+chmod 755 "$ROOT/DEBIAN/postinst"
+
+cat > "$ROOT/DEBIAN/prerm" <<EOF
+#!/bin/sh
+set -e
+
+NAME=${MODULE_NAME}
+VERSION=${PKGVER}
+
+if [ "\$1" = "remove" ] && command -v dkms >/dev/null 2>&1; then
+    dkms remove "\$NAME/\$VERSION" --all || true
+fi
+
+#DEBHELPER#
+EOF
+chmod 755 "$ROOT/DEBIAN/prerm"
+
+cat > "$ROOT/DEBIAN/control" <<EOF
+Package: daedalus-v4l2-dkms
+Version: ${PKGVER}-${PKGREL}
+Section: kernel
+Priority: optional
+Architecture: all
+Depends: dkms (>= 2.1.0.0)
+Recommends: daedalus-v4l2, linux-headers-generic | linux-headers
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Homepage: https://git.reauktion.de/reauktion/daedalus-v4l2
+Description: V4L2 stateless decoder shim kernel module (DKMS) — Pi 5 / CM5
+ Out-of-tree V4L2 m2m kernel module for the daedalus-v4l2 stack on
+ Raspberry Pi 5 / CM5.  Registers /dev/videoNN (V4L2 stateless m2m
+ decoder), /dev/mediaNN (media controller with request API), and
+ /dev/daedalus-v4l2 (chardev bridge to the userspace daemon).
+ .
+ The actual decode happens in the userspace daemon shipped by the
+ daedalus-v4l2 package — this module is just the kernel-side V4L2
+ plumbing.  Install both to actually serve VAAPI / V4L2 clients.
+ .
+ Built via DKMS against the running kernel's headers.
+EOF
+
+DEB_OUT="daedalus-v4l2-dkms_${PKGVER}-${PKGREL}_all.deb"
+dpkg-deb --root-owner-group --build "$ROOT" "$HERE/$DEB_OUT"
+echo "built: $HERE/$DEB_OUT"

debian/daedalus-v4l2-dkms/debian/changelog

@@ -0,0 +1,11 @@
+daedalus-v4l2-dkms (0.1.0+r16+gf55b2cd-1) bookworm trixie; urgency=medium
+
+  * Initial Debian DKMS packaging for the daedalus_v4l2 kernel module.
+  * Pinned to f55b2cd (Phase 8.13 close): kernel-side framework
+    integration (V4L2 m2m, dmabuf-export, media controller, request
+    API, NV12 single-plane + NV12M + P010 CAPTURE) that closes the
+    libva→/dev/video0→daemon round-trip with byte-exact pixels.
+  * Auto-builds via DKMS against the running kernel's headers.
+  * Companion userspace package: daedalus-v4l2 (daemon + tools).
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Mon, 18 May 2026 23:00:00 +0000

debian/daedalus-v4l2-dkms/debian/control

@@ -0,0 +1,24 @@
+Source: daedalus-v4l2-dkms
+Section: kernel
+Priority: optional
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Build-Depends: debhelper-compat (= 13)
+Standards-Version: 4.6.2
+Homepage: https://git.reauktion.de/reauktion/daedalus-v4l2
+
+Package: daedalus-v4l2-dkms
+Architecture: all
+Depends: ${misc:Depends}, dkms (>= 2.1.0.0)
+Recommends: daedalus-v4l2,
+            linux-headers-generic | linux-headers
+Description: V4L2 stateless decoder shim kernel module (DKMS) — Pi 5 / CM5
+ Out-of-tree V4L2 m2m kernel module for the daedalus-v4l2 stack on
+ Raspberry Pi 5 / CM5. Registers /dev/videoNN (V4L2 stateless m2m
+ decoder), /dev/mediaNN (media controller with request API), and
+ /dev/daedalus-v4l2 (chardev bridge to the userspace daemon).
+ .
+ The actual decode happens in the userspace daemon shipped by the
+ daedalus-v4l2 package — this module is just the kernel-side V4L2
+ plumbing. Install both to actually serve VAAPI / V4L2 clients.
+ .
+ Built via DKMS against the running kernel's headers.

debian/daedalus-v4l2-dkms/debian/copyright

@@ -0,0 +1,21 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: daedalus-v4l2
+Upstream-Contact: Markus Fritsche <fritsche.markus@gmail.com>
+Source: https://git.reauktion.de/reauktion/daedalus-v4l2
+
+Files: *
+Copyright: 2026 Markus Fritsche <fritsche.markus@gmail.com>
+License: GPL-2.0-or-later
+Comment:
+ Kernel module (loadable into the Linux kernel) — GPL-2.0-or-later.
+ The shared protocol header carries an additional Linux-syscall-note
+ exception so userspace inclusion is BSD-clean.
+
+License: GPL-2.0-or-later
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+ .
+ On Debian systems, the complete text of the GNU General Public
+ License v2 can be found in `/usr/share/common-licenses/GPL-2'.

debian/daedalus-v4l2/build-deb.sh

@@ -0,0 +1,106 @@
+#!/bin/bash
+# Build daedalus-v4l2_<ver>_arm64.deb (userspace daemon + test tools).
+#
+# Mirrors arch/daedalus-v4l2 (Arch Linux build).  The companion DKMS
+# package (debian/daedalus-v4l2-dkms) carries the kernel module
+# separately so apt/dpkg can split kernel-version-tied and userspace
+# upgrade cadence.
+#
+# Sibling Arch package: ../../arch/daedalus-v4l2/PKGBUILD
+# Sibling DKMS package: ../daedalus-v4l2-dkms/build-deb.sh
+# Upstream repo: https://git.reauktion.de/reauktion/daedalus-v4l2
+set -euo pipefail
+
+# Same pin as the Arch PKGBUILD.  f55b2cd = "Phase 8.13: byte-exact
+# end-to-end via libva (consumer target hit)" — first commit where the
+# full ffmpeg -hwaccel vaapi → libva → /dev/video0 → daemon path lands
+# a pixel-correct decoded frame back in ffmpeg.
+UPSTREAM_COMMIT=f55b2cdab8a8c0bc04e8c1bb1d0b6ca85e7d96d2
+PKGVER=0.1.0+r16+gf55b2cd
+PKGREL=1
+
+HERE=$(dirname "$(readlink -f "$0")")
+
+# Reproducible build.  2026-05-18 23:00 UTC — Phase 8.13 close.
+export SOURCE_DATE_EPOCH=1779231600
+
+work=$(mktemp -d)
+trap "rm -rf $work" EXIT
+
+cd "$work"
+curl -sSLfo daedalus-v4l2.tar.gz \
+    "https://git.reauktion.de/reauktion/daedalus-v4l2/archive/${UPSTREAM_COMMIT}.tar.gz"
+tar xzf daedalus-v4l2.tar.gz
+SRCDIR=daedalus-v4l2
+
+# Build daemon (CMake)
+cd "$SRCDIR/daemon"
+cmake -B build -G Ninja \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_INSTALL_PREFIX=/usr
+cmake --build build
+
+# Build test tools (in-tree Makefile)
+cd "$work/$SRCDIR/tools"
+make
+
+# Stage
+ROOT="$work/pkgroot"
+mkdir -p "$ROOT/DEBIAN" \
+         "$ROOT/usr/bin" \
+         "$ROOT/usr/libexec/daedalus-v4l2" \
+         "$ROOT/usr/include" \
+         "$ROOT/usr/share/doc/daedalus-v4l2"
+
+install -m 755 "$work/$SRCDIR/daemon/build/daedalus_v4l2_daemon" \
+    "$ROOT/usr/bin/daedalus_v4l2_daemon"
+
+install -m 755 "$work/$SRCDIR/tools/test_chardev_pingpong" \
+    "$ROOT/usr/libexec/daedalus-v4l2/test_chardev_pingpong"
+install -m 755 "$work/$SRCDIR/tools/test_m2m_decode" \
+    "$ROOT/usr/libexec/daedalus-v4l2/test_m2m_decode"
+install -m 755 "$work/$SRCDIR/tools/test_m2m_stream" \
+    "$ROOT/usr/libexec/daedalus-v4l2/test_m2m_stream"
+
+install -m 644 "$work/$SRCDIR/include/daedalus_v4l2_proto.h" \
+    "$ROOT/usr/include/daedalus_v4l2_proto.h"
+
+install -m 644 "$work/$SRCDIR/README.md" \
+    "$ROOT/usr/share/doc/daedalus-v4l2/README.md"
+for d in "$work/$SRCDIR/docs/"*.md; do
+    install -m 644 "$d" "$ROOT/usr/share/doc/daedalus-v4l2/$(basename "$d")"
+done
+
+install -Dm644 "$HERE/debian/copyright" "$ROOT/usr/share/doc/daedalus-v4l2/copyright"
+install -Dm644 "$HERE/debian/changelog" "$ROOT/usr/share/doc/daedalus-v4l2/changelog.Debian"
+gzip -9 -n "$ROOT/usr/share/doc/daedalus-v4l2/changelog.Debian"
+
+cat > "$ROOT/DEBIAN/control" <<EOF
+Package: daedalus-v4l2
+Version: ${PKGVER}-${PKGREL}
+Section: video
+Priority: optional
+Architecture: arm64
+Depends: ffmpeg (>= 7.1), libdrm2
+Recommends: daedalus-v4l2-dkms
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Homepage: https://git.reauktion.de/reauktion/daedalus-v4l2
+Description: Userspace daemon for the daedalus_v4l2 stateless decoder shim
+ daedalus-v4l2 ships the userspace daemon that backs the daedalus_v4l2
+ out-of-tree V4L2 kernel module on Raspberry Pi 5 / CM5.  Together they
+ expose /dev/videoNN + /dev/mediaNN as a V4L2 stateless decoder for
+ VP9, AV1, and H.264 — actual decoding happens in this single-threaded
+ daemon via dlopen'd FFmpeg, with decoded NV12 / P010 frames shipped
+ back through dmabuf.
+ .
+ Consumed end-to-end by libva-v4l2-request-fourier (>= 1.0.0+r376) so
+ that 'ffmpeg -hwaccel vaapi' against vp9_small.ivf produces a
+ byte-exact NV12 frame.
+ .
+ The kernel module ships separately in daedalus-v4l2-dkms; install
+ both to actually serve V4L2 clients.
+EOF
+
+DEB_OUT="daedalus-v4l2_${PKGVER}-${PKGREL}_arm64.deb"
+dpkg-deb --root-owner-group --build "$ROOT" "$HERE/$DEB_OUT"
+echo "built: $HERE/$DEB_OUT"

debian/daedalus-v4l2/debian/changelog

@@ -0,0 +1,13 @@
+daedalus-v4l2 (0.1.0+r16+gf55b2cd-1) bookworm trixie; urgency=medium
+
+  * Initial Debian packaging for the daedalus-v4l2 userspace daemon.
+  * Pinned to f55b2cd (Phase 8.13 close): first commit where the full
+    ffmpeg -hwaccel vaapi → libva-v4l2-request-fourier → /dev/video0
+    → daemon path lands a pixel-correct decoded NV12 frame back in
+    ffmpeg.
+  * Codecs: VP9, AV1, H.264 (all via dlopen'd FFmpeg 7.1.3).
+  * Capture formats: NV12M (2 plane), NV12 (1 plane, for libva),
+    P010 (10-bit single plane).
+  * Companion package: daedalus-v4l2-dkms (kernel module).
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Mon, 18 May 2026 23:00:00 +0000

debian/daedalus-v4l2/debian/control

@@ -0,0 +1,34 @@
+Source: daedalus-v4l2
+Section: video
+Priority: optional
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Build-Depends: debhelper-compat (= 13),
+               cmake,
+               ninja-build,
+               pkg-config,
+               libavformat-dev (>= 7.1),
+               libavcodec-dev (>= 7.1),
+               libavutil-dev (>= 7.1)
+Standards-Version: 4.6.2
+Homepage: https://git.reauktion.de/reauktion/daedalus-v4l2
+
+Package: daedalus-v4l2
+Architecture: arm64
+Depends: ${misc:Depends}, ${shlibs:Depends},
+         ffmpeg (>= 7.1),
+         libdrm2
+Recommends: daedalus-v4l2-dkms
+Description: Userspace daemon for the daedalus_v4l2 stateless decoder shim
+ daedalus-v4l2 ships the userspace daemon that backs the daedalus_v4l2
+ out-of-tree V4L2 kernel module on Raspberry Pi 5 / CM5. Together they
+ expose /dev/videoNN + /dev/mediaNN as a V4L2 stateless decoder for
+ VP9, AV1, and H.264 — actual decoding happens in this single-threaded
+ daemon via dlopen'd FFmpeg, with decoded NV12 / P010 frames shipped
+ back through dmabuf.
+ .
+ Consumed end-to-end by libva-v4l2-request-fourier (>= 1.0.0+r376) so
+ that 'ffmpeg -hwaccel vaapi' against vp9_small.ivf produces a
+ byte-exact NV12 frame.
+ .
+ The kernel module ships separately in daedalus-v4l2-dkms; install
+ both to actually serve V4L2 clients.

debian/daedalus-v4l2/debian/copyright

@@ -0,0 +1,40 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: daedalus-v4l2
+Upstream-Contact: Markus Fritsche <fritsche.markus@gmail.com>
+Source: https://git.reauktion.de/reauktion/daedalus-v4l2
+
+Files: *
+Copyright: 2026 Markus Fritsche <fritsche.markus@gmail.com>
+License: BSD-2-Clause
+
+Files: include/daedalus_v4l2_proto.h
+Copyright: 2026 Markus Fritsche <fritsche.markus@gmail.com>
+License: GPL-2.0-or-later WITH Linux-syscall-note
+Comment:
+ Shared kernel↔daemon wire-protocol header. GPL-2.0-or-later (matches
+ the kernel module that includes it) with the standard
+ Linux-syscall-note exception so userspace inclusion is BSD-clean.
+
+License: BSD-2-Clause
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ .
+ 1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+ .
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES ARE DISCLAIMED.
+
+License: GPL-2.0-or-later
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+ .
+ On Debian systems, the complete text of the GNU General Public
+ License v2 can be found in `/usr/share/common-licenses/GPL-2'.

debian/ffmpeg-v4l2-request-fourier/0001-libudev-bypass-fallback.patch

@@ -0,0 +1,166 @@
+--- a/libavutil/hwcontext_v4l2request.c
++++ b/libavutil/hwcontext_v4l2request.c
+@@ -19,12 +19,13 @@
+ #include "config.h"
+ 
+ #include <fcntl.h>
+ #include <linux/dma-buf.h>
+ #include <linux/media.h>
+ #include <sys/ioctl.h>
++#include <sys/stat.h>
+ #include <sys/mman.h>
+ #include <unistd.h>
+ 
+ #include <drm_fourcc.h>
+ #include <libudev.h>
+ 
+@@ -690,12 +691,125 @@
+     }
+ 
+     udev_enumerate_unref(enumerate);
+     return ret;
+ }
+ 
++/*
++ * Brute-force fallback used when libudev's scan fails (e.g. inside firefox's
++ * RDD sandbox where Mozilla's broker rejects fd-relative openat used by
++ * systemd's chase() symlink resolver). Iterates /dev/video[0..63], picks the
++ * one whose major/minor matches the requested devnum.
++ */
++static char *v4l2request_devnum_to_video_path_brute(dev_t devnum)
++{
++    char path[32];
++    struct stat st;
++    for (int i = 0; i < 64; i++) {
++        snprintf(path, sizeof(path), "/dev/video%d", i);
++        if (stat(path, &st) < 0)
++            continue;
++        if (st.st_rdev == devnum)
++            return av_strdup(path);
++    }
++    return NULL;
++}
++
++/* Brute-force version of v4l2request_probe_video_devices: replaces the
++ * udev_device_new_from_devnum + udev_device_get_devnode flow with
++ * stat()-based major/minor matching against /dev/video[0..63]. */
++static int v4l2request_probe_video_devices_brute(AVHWFramesContext *hwfc,
++                                                 uint32_t pixelformat,
++                                                 uint32_t buffersize)
++{
++    AVV4L2RequestFramesContext *fctx = hwfc->hwctx;
++    AVV4L2RequestFramesContextInternal *fctxi = fctx->internal;
++    struct media_device_info device_info;
++    struct media_v2_topology topology = {0};
++    struct media_v2_interface *interfaces;
++    char *path;
++    dev_t devnum;
++    int ret;
++
++    if (ioctl(fctxi->media_fd, MEDIA_IOC_DEVICE_INFO, &device_info) < 0)
++        return AVERROR(errno);
++
++    if (ioctl(fctxi->media_fd, MEDIA_IOC_G_TOPOLOGY, &topology) < 0)
++        return AVERROR(errno);
++
++    if (!topology.num_interfaces)
++        return AVERROR(ENOENT);
++
++    interfaces = av_calloc(topology.num_interfaces,
++                           sizeof(struct media_v2_interface));
++    if (!interfaces)
++        return AVERROR(ENOMEM);
++
++    topology.ptr_interfaces = (__u64)(uintptr_t)interfaces;
++    if (ioctl(fctxi->media_fd, MEDIA_IOC_G_TOPOLOGY, &topology) < 0) {
++        ret = AVERROR(errno);
++        goto fail;
++    }
++
++    ret = AVERROR(ENOENT);
++    for (unsigned i = 0; i < topology.num_interfaces; i++) {
++        if (interfaces[i].intf_type != MEDIA_INTF_T_V4L_VIDEO)
++            continue;
++
++        devnum = makedev(interfaces[i].devnode.major,
++                         interfaces[i].devnode.minor);
++        path = v4l2request_devnum_to_video_path_brute(devnum);
++        if (!path)
++            continue;
++
++        ret = v4l2request_probe_video_device(hwfc, path, pixelformat, buffersize);
++        if (!ret) {
++            av_log(hwfc, AV_LOG_INFO,
++                   "Using V4L2 media driver %s (brute-force) for %s\n",
++                   device_info.driver, av_fourcc2str(pixelformat));
++            av_free(path);
++            break;
++        }
++        av_free(path);
++    }
++
++fail:
++    av_free(interfaces);
++    return ret;
++}
++
++/* Brute-force fallback for v4l2request_probe_media_devices(). Iterates
++ * /dev/media[0..15], opens each, probes via topology+stat. */
++static int v4l2request_probe_media_devices_brute(AVHWFramesContext *hwfc,
++                                                 uint32_t pixelformat,
++                                                 uint32_t buffersize)
++{
++    AVV4L2RequestFramesContext *fctx = hwfc->hwctx;
++    AVV4L2RequestFramesContextInternal *fctxi = fctx->internal;
++    char path[32];
++    int ret = AVERROR(ENOENT);
++
++    for (int i = 0; i < 16; i++) {
++        snprintf(path, sizeof(path), "/dev/media%d", i);
++
++        fctxi->media_fd = open(path, O_RDWR);
++        if (fctxi->media_fd < 0)
++            continue;
++
++        ret = v4l2request_probe_video_devices_brute(hwfc, pixelformat,
++                                                    buffersize);
++        if (!ret)
++            return 0;
++
++        close(fctxi->media_fd);
++        fctxi->media_fd = -1;
++    }
++
++    return ret;
++}
++
+ static int v4l2request_open_decoder(AVHWFramesContext *hwfc)
+ {
+     AVV4L2RequestFramesContext *fctx = hwfc->hwctx;
+     uint32_t buffersize;
+     struct udev *udev;
+     int ret;
+@@ -712,12 +826,23 @@
+ 
+     buffersize = FFMAX(hwfc->width * hwfc->height * 3 / 2, 256 * 1024);
+ 
+     // Probe all media devices (auto-detection)
+     ret = v4l2request_probe_media_devices(hwfc, udev, fctx->pixelformat, buffersize);
+ 
++    // Brute-force fallback when libudev fails. Firefox-fourier hits this
++    // because Mozilla's RDD sandbox blocks fd-relative openat used by
++    // systemd's chase() symlink resolver inside udev_enumerate_scan_devices.
++    if (ret < 0) {
++        av_log(hwfc, AV_LOG_INFO,
++               "libudev probe failed (%d), falling back to brute-force /dev/media*\n",
++               ret);
++        ret = v4l2request_probe_media_devices_brute(hwfc, fctx->pixelformat,
++                                                    buffersize);
++    }
++
+     udev_unref(udev);
+     return ret;
+ }
+ 
+ static AVBufferRef *v4l2request_v4l2_buffer_alloc(AVHWFramesContext *hwfc,
+                                                   struct v4l2_format *format)

debian/ffmpeg-v4l2-request-fourier/0002-nv15-to-p010-unpack.patch

@@ -0,0 +1,178 @@
+From 0cd6e669735e453ec8772f111065bbb2f70a5bc6 Mon Sep 17 00:00:00 2001
+From: Markus Fritsche <mfritsche@reauktion.de>
+Date: Mon, 18 May 2026 07:27:10 +0000
+Subject: [PATCH] avutil/hwcontext_v4l2request: unpack NV15 to P010 in
+ transfer_data_from
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+V4L2_PIX_FMT_NV15 (RK3399/RK3588 rkvdec 10-bit 4:2:0 capture) is mapped to
+sw_format = AV_PIX_FMT_YUV420P10 in v4l2request_capture_pixelformats[]. The
+existing transfer_get_formats explicitly blanked the format list for that
+sw_format, so 'ffmpeg -hwaccel v4l2request -vf hwdownload,format=p010le' on
+a Hi10P / Main10 input failed at filter init with EINVAL before reaching
+the actual decode (which itself succeeds — 2 frames decoded cleanly).
+
+Expose AV_PIX_FMT_P010 as the transfer target for NV15-backed surfaces and
+unpack the packed 10-bit samples into the standard high-bits-of-16 layout
+inside transfer_data_from. Luma and chroma share the same packing format
+(5 bytes per 4 samples, little endian); chroma plane is W × H/2 samples
+for 4:2:0.
+
+The other 'needs custom unpack' sw_formats (YUV420P / Allwinner NV12_32L32
+tiled and YUV422P10 / rkvdec NV20) keep the original ENOSYS path because
+they need different unpack code that isn't covered by this patch.
+
+Closes marfrit/marfrit-packages#21.
+---
+ libavutil/hwcontext_v4l2request.c | 111 +++++++++++++++++++++++++++++-
+ 1 file changed, 110 insertions(+), 1 deletion(-)
+
+diff --git a/libavutil/hwcontext_v4l2request.c b/libavutil/hwcontext_v4l2request.c
+index b6633d9081..3842160dfb 100644
+--- a/libavutil/hwcontext_v4l2request.c
++++ b/libavutil/hwcontext_v4l2request.c
+@@ -1073,6 +1073,56 @@ fail:
+     return ret;
+ }
+ 
++/*
++ * Unpack one NV15-packed 10-bit plane (5 bytes per 4 samples, little endian)
++ * into a P010-style plane (10 bits in the high bits of a 16-bit container).
++ * `dst_stride` is in bytes; `src_stride` is bytes per row of NV15 data.
++ */
++static void v4l2request_nv15_unpack_plane_to_p010(const uint8_t *src,
++                                                  uint16_t *dst,
++                                                  unsigned width,
++                                                  unsigned height,
++                                                  unsigned src_stride,
++                                                  unsigned dst_stride)
++{
++    for (unsigned y = 0; y < height; y++) {
++        const uint8_t *s = src + y * src_stride;
++        uint16_t *d = (uint16_t *)((uint8_t *)dst + y * dst_stride);
++        unsigned x;
++
++        for (x = 0; x + 4 <= width; x += 4) {
++            uint16_t a = (uint16_t)s[0] | ((uint16_t)(s[1] & 0x03) << 8);
++            uint16_t b = ((uint16_t)s[1] >> 2) | ((uint16_t)(s[2] & 0x0F) << 6);
++            uint16_t c = ((uint16_t)s[2] >> 4) | ((uint16_t)(s[3] & 0x3F) << 4);
++            uint16_t e = ((uint16_t)s[3] >> 6) | ((uint16_t)s[4] << 2);
++
++            d[0] = (uint16_t)(a << 6);
++            d[1] = (uint16_t)(b << 6);
++            d[2] = (uint16_t)(c << 6);
++            d[3] = (uint16_t)(e << 6);
++
++            d += 4;
++            s += 5;
++        }
++
++        if (x < width) {
++            unsigned rem = width - x;
++            uint16_t pix[4] = { 0, 0, 0, 0 };
++
++            pix[0] = (uint16_t)s[0] | ((uint16_t)(s[1] & 0x03) << 8);
++            if (rem >= 2)
++                pix[1] = ((uint16_t)s[1] >> 2) | ((uint16_t)(s[2] & 0x0F) << 6);
++            if (rem >= 3)
++                pix[2] = ((uint16_t)s[2] >> 4) | ((uint16_t)(s[3] & 0x3F) << 4);
++            if (rem >= 4)
++                pix[3] = ((uint16_t)s[3] >> 6) | ((uint16_t)s[4] << 2);
++
++            for (unsigned j = 0; j < rem; j++)
++                d[j] = (uint16_t)(pix[j] << 6);
++        }
++    }
++}
++
+ static int v4l2request_transfer_get_formats(AVHWFramesContext *hwfc,
+                                             enum AVHWFrameTransferDirection dir,
+                                             enum AVPixelFormat **formats)
+@@ -1082,6 +1132,22 @@ static int v4l2request_transfer_get_formats(AVHWFramesContext *hwfc,
+     if (dir == AV_HWFRAME_TRANSFER_DIRECTION_TO)
+         return AVERROR(ENOSYS);
+ 
++    /*
++     * NV15-backed surfaces (sw_format = YUV420P10) are exposed as P010 to
++     * downstream filters: the unpack below converts the packed 10-bit
++     * samples into the standard high-bits-of-16 layout. Hi10P / Main10
++     * VAAPI/v4l2-request decode reaches userspace through this path.
++     */
++    if (hwfc->sw_format == AV_PIX_FMT_YUV420P10) {
++        fmts = av_malloc_array(2, sizeof(*fmts));
++        if (!fmts)
++            return AVERROR(ENOMEM);
++        fmts[0] = AV_PIX_FMT_P010;
++        fmts[1] = AV_PIX_FMT_NONE;
++        *formats = fmts;
++        return 0;
++    }
++
+     fmts = av_malloc_array(2, sizeof(*fmts));
+     if (!fmts)
+         return AVERROR(ENOMEM);
+@@ -1089,8 +1155,13 @@ static int v4l2request_transfer_get_formats(AVHWFramesContext *hwfc,
+     fmts[0] = hwfc->sw_format;
+     fmts[1] = AV_PIX_FMT_NONE;
+ 
++    /*
++     * Tiled-NV12-32L32 (Allwinner) and NV20 (rkvdec 4:2:2 10-bit) still need
++     * dedicated unpacks before hwdownload can consume them; leave them as
++     * "no transfer formats" so the filter graph reports the limitation
++     * rather than silently producing garbage.
++     */
+     if (hwfc->sw_format == AV_PIX_FMT_YUV420P ||
+-        hwfc->sw_format == AV_PIX_FMT_YUV420P10 ||
+         hwfc->sw_format == AV_PIX_FMT_YUV422P10)
+         fmts[0] = AV_PIX_FMT_NONE;
+ 
+@@ -1110,6 +1181,44 @@ static int v4l2request_transfer_data_from(AVHWFramesContext *hwfc,
+     map = av_frame_alloc();
+     if (!map)
+         return AVERROR(ENOMEM);
++
++    /*
++     * For NV15→P010, map the raw NV15 bytes (sw_format) and unpack into
++     * dst's P010 storage. Otherwise fall through to the original byte-copy
++     * path used for 1:1 sw_format matches (NV12, NV16, AFBC handled by DRM).
++     */
++    if (hwfc->sw_format == AV_PIX_FMT_YUV420P10) {
++        /*
++         * Only P010 is advertised by transfer_get_formats for this sw_format;
++         * a caller that bypasses get_formats and asks for anything else would
++         * silently corrupt output via av_frame_copy on NV15-packed bytes.
++         * Reject explicitly.
++         */
++        if (dst->format != AV_PIX_FMT_P010) {
++            ret = AVERROR(ENOSYS);
++            goto fail;
++        }
++
++        map->format = hwfc->sw_format;
++        ret = v4l2request_map_frame(hwfc, map, src);
++        if (ret)
++            goto fail;
++
++        v4l2request_nv15_unpack_plane_to_p010(map->data[0],
++                                              (uint16_t *)dst->data[0],
++                                              dst->width, dst->height,
++                                              map->linesize[0],
++                                              dst->linesize[0]);
++        /* NV15 chroma plane is W × H/2 samples (4:2:0, UV interleaved). */
++        v4l2request_nv15_unpack_plane_to_p010(map->data[1],
++                                              (uint16_t *)dst->data[1],
++                                              dst->width, dst->height / 2,
++                                              map->linesize[1],
++                                              dst->linesize[1]);
++        ret = 0;
++        goto fail;
++    }
++
+     map->format = dst->format;
+ 
+     ret = v4l2request_map_frame(hwfc, map, src);
+-- 
+2.47.3
+

debian/ffmpeg-v4l2-request-fourier/build-deb.sh

@@ -0,0 +1,177 @@
+#!/bin/bash
+# Build ffmpeg-v4l2-request-fourier_<ver>_arm64.deb (the Kwiboo FFmpeg
+# fork with the V4L2-Request API hwaccel patches).
+#
+# Mirror of arch/ffmpeg-v4l2-request-fourier into the Debian tree.
+# Provides the patched `ffmpeg` + `ffprobe` binaries plus the shared
+# libav* libraries with v4l2-request support, so consumers like
+# mpv-fourier (and the kdirect bit-exact reference test rig) work
+# end-to-end without a stock-Debian FFmpeg fallback.
+#
+# Conflicts: ffmpeg, libav* — this is a drop-in replacement.  Pi 5 /
+# CM5 (BCM2712) hosts using daedalus_v4l2 + libva-v4l2-request-fourier
+# DON'T strictly need this package (stock Debian ffmpeg + libva path
+# is sufficient for the VAAPI route), but the kdirect bit-exact
+# reference + firefox-fourier / mpv-fourier consumers do.
+#
+# Big build: 25-40 min on a runner.  Output is a single .deb that
+# bundles ffmpeg/ffprobe + libavcodec.so.61 + libavformat.so.61 etc.
+# all together — no split per-library subpackages.  Easier to consume,
+# trades off finer-grained downgrades.
+#
+# Sibling Arch package: ../../arch/ffmpeg-v4l2-request-fourier/PKGBUILD
+# Upstream: https://github.com/Kwiboo/FFmpeg (branch v4l2-request-n8.1)
+set -euo pipefail
+
+# Same pin as arch/ — v4l2-request-n8.1 tip 2026-04-24.
+UPSTREAM_COMMIT=b57fbbe50c9b2656fad86a1a7eeabfd2b2a50935
+FFMPEG_VERSION=8.1
+# epoch 2 matches Debian's stock ffmpeg (currently 7:7.1.x in trixie);
+# +rfourier suffix to avoid colliding with upstream/Debian rebuilds.
+PKGVER=2:${FFMPEG_VERSION}+rfourier+gb57fbbe
+PKGREL=1
+
+HERE=$(dirname "$(readlink -f "$0")")
+
+# Reproducible build.  2026-05-18 23:00 UTC — Phase 8.13 close.
+export SOURCE_DATE_EPOCH=1779231600
+
+work=$(mktemp -d)
+trap "rm -rf $work" EXIT
+
+cd "$work"
+git clone --depth 1 \
+    --branch v4l2-request-n8.1 \
+    https://github.com/Kwiboo/FFmpeg.git FFmpeg
+cd FFmpeg
+# git fetch the specific commit (depth=1 of branch tip might not be it)
+if [ "$(git rev-parse HEAD)" != "$UPSTREAM_COMMIT" ]; then
+    git fetch origin "$UPSTREAM_COMMIT"
+    git checkout "$UPSTREAM_COMMIT"
+fi
+
+# Apply patches (same as Arch).
+patch -Np1 -i "$HERE/0001-libudev-bypass-fallback.patch"
+patch -Np1 -i "$HERE/0002-nv15-to-p010-unpack.patch"
+
+# Configure with Arch-parity flags.  Drops the same set of features
+# (X11, AMF, CUDA, FireWire, AviSynth, Bluray, OpenMPT, JPEG-XL,
+# Theora, XVid, rsvg, soxr, ssh, vidstab, modplug, SDL2, Vulkan,
+# JACK, GSM, Speex) — not needed on the Fourier fleet, keeps the .deb
+# smaller and the dependency graph tighter.
+./configure \
+    --prefix=/usr \
+    --libdir=/usr/lib/aarch64-linux-gnu \
+    --shlibdir=/usr/lib/aarch64-linux-gnu \
+    --incdir=/usr/include/aarch64-linux-gnu \
+    --disable-debug \
+    --disable-static \
+    --disable-doc \
+    --disable-stripping \
+    --enable-shared \
+    --enable-gpl \
+    --enable-version3 \
+    --enable-pic \
+    --enable-neon \
+    --arch=aarch64 \
+    --enable-libdrm \
+    --enable-libv4l2 \
+    --enable-libudev \
+    --enable-v4l2-request \
+    --enable-v4l2_m2m \
+    --enable-vaapi \
+    --enable-opengl \
+    --enable-gnutls \
+    --enable-fontconfig \
+    --enable-libass \
+    --enable-libfreetype \
+    --enable-libfribidi \
+    --enable-libxml2 \
+    --enable-libpulse \
+    --enable-libdav1d \
+    --enable-libopus \
+    --enable-libvorbis \
+    --enable-libmp3lame \
+    --enable-libvpx \
+    --enable-libx264 \
+    --enable-libx265 \
+    --enable-libwebp \
+    --host-cflags='-fPIC'
+
+make -j"$(nproc)"
+make tools/qt-faststart
+
+# Stage
+ROOT="$work/pkgroot"
+make DESTDIR="$ROOT" install
+install -Dm755 tools/qt-faststart "$ROOT/usr/bin/qt-faststart"
+
+# Doc
+mkdir -p "$ROOT/usr/share/doc/ffmpeg-v4l2-request-fourier" "$ROOT/DEBIAN"
+install -Dm644 "$HERE/debian/copyright" \
+    "$ROOT/usr/share/doc/ffmpeg-v4l2-request-fourier/copyright"
+install -Dm644 "$HERE/debian/changelog" \
+    "$ROOT/usr/share/doc/ffmpeg-v4l2-request-fourier/changelog.Debian"
+gzip -9 -n "$ROOT/usr/share/doc/ffmpeg-v4l2-request-fourier/changelog.Debian"
+
+cat > "$ROOT/DEBIAN/control" <<EOF
+Package: ffmpeg-v4l2-request-fourier
+Version: ${PKGVER}-${PKGREL}
+Section: video
+Priority: optional
+Architecture: arm64
+Depends: libc6,
+         libdrm2,
+         libfontconfig1,
+         libfreetype6,
+         libfribidi0,
+         libxml2,
+         libpulse0,
+         libdav1d7 | libdav1d6,
+         libopus0,
+         libvorbis0a,
+         libvorbisenc2,
+         libmp3lame0,
+         libvpx9 | libvpx8 | libvpx7,
+         libx264-164 | libx264-163,
+         libx265-215 | libx265-209 | libx265-199,
+         libwebp7 | libwebp6,
+         libwebpmux3,
+         libass9,
+         libgnutls30,
+         libudev1,
+         libv4l-0,
+         libva2,
+         libva-drm2
+Conflicts: ffmpeg, libavcodec61, libavformat61, libavutil59,
+           libswresample5, libswscale8, libavdevice61, libavfilter10,
+           libpostproc58
+Replaces: ffmpeg, libavcodec61, libavformat61, libavutil59,
+          libswresample5, libswscale8, libavdevice61, libavfilter10,
+          libpostproc58
+Provides: ffmpeg (= ${PKGVER}-${PKGREL}),
+          libavcodec.so.61,
+          libavformat.so.61,
+          libavutil.so.59
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Homepage: https://github.com/Kwiboo/FFmpeg
+Description: FFmpeg with V4L2 Request API hwaccel (Kwiboo fork)
+ FFmpeg ${FFMPEG_VERSION} patched with the V4L2 Request API stateless
+ video decoder hwaccel — Kwiboo's long-running rebase of Jernej
+ Škrabec's v4l2-request patchset onto FFmpeg release tags.
+ .
+ Provides 'ffmpeg -hwaccel v4l2request' / '-hwaccel drm' routes that
+ drive rkvdec / hantro / cedrus / rpi-hevc-dec / daedalus_v4l2
+ stateless decoders directly through libavcodec's hwdevice DRM path,
+ bypassing libva.  Used by mpv-fourier and firefox-fourier as their
+ backing FFmpeg, and as the kdirect bit-exact reference in libva-v4l2-
+ request-fourier validation.
+ .
+ Drops X11/AMF/CUDA/Bluray/JACK/Vulkan/SDL2/Theora/XVid/Speex/JPEG-XL
+ per Fourier fleet policy (Wayland + ARM + video-decode focus).
+ No 'ffplay' binary; mpv-fourier covers interactive playback.
+EOF
+
+DEB_OUT="ffmpeg-v4l2-request-fourier_${PKGVER//:/%3a}-${PKGREL}_arm64.deb"
+dpkg-deb --root-owner-group --build "$ROOT" "$HERE/$DEB_OUT"
+echo "built: $HERE/$DEB_OUT"

debian/ffmpeg-v4l2-request-fourier/debian/changelog

@@ -0,0 +1,14 @@
+ffmpeg-v4l2-request-fourier (2:8.1+rfourier+gb57fbbe-1) bookworm trixie; urgency=medium
+
+  * Initial Debian packaging for the Kwiboo FFmpeg fork with V4L2
+    Request API hwaccel patches.
+  * Mirror of arch/ffmpeg-v4l2-request-fourier (same pin b57fbbe,
+    same configure flags, same 2 patches: libudev-bypass-fallback +
+    nv15-to-p010-unpack).
+  * Drop-in replacement for Debian's stock ffmpeg + libav*; takes
+    epoch 2 to win the apt version comparison.
+  * Required by mpv-fourier and firefox-fourier; not strictly
+    required for the VAAPI-only path on daedalus-v4l2 hosts (stock
+    libva + Debian ffmpeg works there).
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Mon, 18 May 2026 23:00:00 +0000

debian/ffmpeg-v4l2-request-fourier/debian/control

@@ -0,0 +1,61 @@
+Source: ffmpeg-v4l2-request-fourier
+Section: video
+Priority: optional
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Build-Depends: debhelper-compat (= 13),
+               git,
+               nasm,
+               pkg-config,
+               libass-dev,
+               libdrm-dev,
+               libfontconfig1-dev,
+               libfreetype6-dev,
+               libfribidi-dev,
+               libgnutls28-dev,
+               libmp3lame-dev,
+               libopus-dev,
+               libpulse-dev,
+               libudev-dev,
+               libv4l-dev,
+               libva-dev,
+               libvorbis-dev,
+               libvpx-dev,
+               libwebp-dev,
+               libx264-dev,
+               libx265-dev,
+               libxml2-dev,
+               libdav1d-dev,
+               linux-libc-dev
+Standards-Version: 4.6.2
+Homepage: https://github.com/Kwiboo/FFmpeg
+
+Package: ffmpeg-v4l2-request-fourier
+Architecture: arm64
+Depends: ${misc:Depends}, ${shlibs:Depends}
+Conflicts: ffmpeg,
+           libavcodec61, libavformat61, libavutil59,
+           libswresample5, libswscale8, libavdevice61, libavfilter10,
+           libpostproc58
+Replaces: ffmpeg,
+          libavcodec61, libavformat61, libavutil59,
+          libswresample5, libswscale8, libavdevice61, libavfilter10,
+          libpostproc58
+Provides: ffmpeg (= ${binary:Version}),
+          libavcodec.so.61,
+          libavformat.so.61,
+          libavutil.so.59
+Description: FFmpeg with V4L2 Request API hwaccel (Kwiboo fork)
+ FFmpeg 8.1 patched with the V4L2 Request API stateless video decoder
+ hwaccel — Kwiboo's long-running rebase of Jernej Škrabec's
+ v4l2-request patchset onto FFmpeg release tags.
+ .
+ Provides 'ffmpeg -hwaccel v4l2request' / '-hwaccel drm' routes that
+ drive rkvdec / hantro / cedrus / rpi-hevc-dec / daedalus_v4l2
+ stateless decoders directly through libavcodec's hwdevice DRM path,
+ bypassing libva. Used by mpv-fourier and firefox-fourier as their
+ backing FFmpeg, and as the kdirect bit-exact reference in
+ libva-v4l2-request-fourier validation.
+ .
+ Drops X11/AMF/CUDA/Bluray/JACK/Vulkan/SDL2/Theora/XVid/Speex/JPEG-XL
+ per Fourier fleet policy (Wayland + ARM + video-decode focus). No
+ 'ffplay' binary; mpv-fourier covers interactive playback.

debian/ffmpeg-v4l2-request-fourier/debian/copyright

@@ -0,0 +1,21 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: FFmpeg (Kwiboo v4l2-request fork)
+Upstream-Contact: Niklas Haas <niklas@haasn.dev>, Jernej Škrabec, Kwiboo
+Source: https://github.com/Kwiboo/FFmpeg
+
+Files: *
+Copyright: 2000-2026 The FFmpeg developers
+License: GPL-3.0-or-later
+
+Files: 0001-libudev-bypass-fallback.patch 0002-nv15-to-p010-unpack.patch
+Copyright: 2024-2026 Markus Fritsche <fritsche.markus@gmail.com>
+License: GPL-3.0-or-later
+
+License: GPL-3.0-or-later
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+ .
+ On Debian systems, the complete text of the GNU General Public
+ License v3 can be found in `/usr/share/common-licenses/GPL-3'.

debian/libva-v4l2-request-fourier/build-deb.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+# Build libva-v4l2-request-fourier_<ver>_arm64.deb.
+#
+# Compiles the libva ICD from the marfrit/libva-v4l2-request-fourier
+# tip pinned in PKGVER below.  Mirrors arch/libva-v4l2-request-fourier
+# (Arch Linux build).  Output is a single arm64 .deb that ships the
+# VA-API driver as /usr/lib/aarch64-linux-gnu/dri/v4l2_request_drv_video.so.
+#
+# Sibling Arch package: ../../arch/libva-v4l2-request-fourier/PKGBUILD
+# Upstream fork: https://git.reauktion.de/marfrit/libva-v4l2-request-fourier
+set -euo pipefail
+
+# Same pin as the Arch PKGBUILD.  de27e95 = "v4l2: log error_idx +
+# failing ctrl id on S_EXT_CTRLS failure" (Phase 8.13 diagnostic).
+UPSTREAM_COMMIT=de27e95571b67ef34619c23a12db4698f9b3454e
+PKGVER=1.0.0+r376+gde27e95
+PKGREL=1
+
+HERE=$(dirname "$(readlink -f "$0")")
+
+# Reproducible build.  2026-05-18 23:00 UTC — Phase 8.13 close.
+export SOURCE_DATE_EPOCH=1779231600
+
+work=$(mktemp -d)
+trap "rm -rf $work" EXIT
+
+cd "$work"
+curl -sSLfo libva-fourier.tar.gz \
+    "https://git.reauktion.de/marfrit/libva-v4l2-request-fourier/archive/${UPSTREAM_COMMIT}.tar.gz"
+tar xzf libva-fourier.tar.gz
+SRCDIR=$(echo libva-v4l2-request-fourier)
+
+cd "$SRCDIR"
+meson setup build \
+    --buildtype=release \
+    --prefix=/usr \
+    --libdir=lib/aarch64-linux-gnu \
+    -Db_lto=false
+meson compile -C build
+
+ROOT="$work/pkgroot"
+DESTDIR="$ROOT" meson install -C build
+
+# Strip any non-package debug, then drop dependencies + control.
+install -Dm644 "$HERE/debian/copyright" "$ROOT/usr/share/doc/libva-v4l2-request-fourier/copyright"
+install -Dm644 "$HERE/debian/changelog" "$ROOT/usr/share/doc/libva-v4l2-request-fourier/changelog.Debian"
+gzip -9 -n "$ROOT/usr/share/doc/libva-v4l2-request-fourier/changelog.Debian"
+
+mkdir -p "$ROOT/DEBIAN"
+cat > "$ROOT/DEBIAN/control" <<EOF
+Package: libva-v4l2-request-fourier
+Version: ${PKGVER}-${PKGREL}
+Section: libs
+Priority: optional
+Architecture: arm64
+Depends: libva2, libdrm2
+Conflicts: libva-v4l2-request
+Replaces: libva-v4l2-request
+Provides: libva-driver, libva-v4l2-request (= ${PKGVER}-${PKGREL})
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Homepage: https://git.reauktion.de/marfrit/libva-v4l2-request-fourier
+Description: VA-API backend for V4L2 stateless decoders (fourier fork)
+ LibVA implementation for the Linux Video4Linux2 Request API, multiplanar
+ fork of bootlin/libva-v4l2-request.  Drives rkvdec / hantro / cedrus /
+ rpi-hevc-dec / daedalus_v4l2 stateless decoders for H.264, HEVC, VP8,
+ VP9, AV1, and MPEG-2.
+ .
+ Auto-detected by VAAPI consumers (ffmpeg -hwaccel vaapi, mpv --hwdec=vaapi,
+ Firefox VAAPI accel) when LIBVA_DRIVER_NAME=v4l2_request is set.
+EOF
+
+DEB_OUT="libva-v4l2-request-fourier_${PKGVER}-${PKGREL}_arm64.deb"
+dpkg-deb --root-owner-group --build "$ROOT" "$HERE/$DEB_OUT"
+echo "built: $HERE/$DEB_OUT"

debian/libva-v4l2-request-fourier/debian/changelog

@@ -0,0 +1,15 @@
+libva-v4l2-request-fourier (1.0.0+r376+gde27e95-1) bookworm trixie; urgency=medium
+
+  * Initial Debian packaging (sibling to existing
+    arch/libva-v4l2-request-fourier).
+  * Pinned to fork tip de27e95: "v4l2: log error_idx + failing ctrl id
+    on S_EXT_CTRLS failure" — Phase 8.13 diagnostic that surfaced the
+    real root cause of the libva→daedalus_v4l2 request-completion
+    timeout.
+  * Includes daedalus_v4l2 probe slot (b5b3acf) and meson option gate
+    (2146341) for the Pi 5 daemon-backed decoder shim.
+  * Backward-compatible on rkvdec / hantro / cedrus / rpi-hevc-dec
+    hosts — daedalus probe is off by default unless the kernel module
+    is present.
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Mon, 18 May 2026 23:00:00 +0000

debian/libva-v4l2-request-fourier/debian/control

@@ -0,0 +1,27 @@
+Source: libva-v4l2-request-fourier
+Section: libs
+Priority: optional
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Build-Depends: debhelper-compat (= 13),
+               libva-dev,
+               libdrm-dev,
+               meson (>= 0.43),
+               ninja-build,
+               pkg-config
+Standards-Version: 4.6.2
+Homepage: https://git.reauktion.de/marfrit/libva-v4l2-request-fourier
+
+Package: libva-v4l2-request-fourier
+Architecture: arm64
+Depends: ${misc:Depends}, ${shlibs:Depends}, libva2, libdrm2
+Conflicts: libva-v4l2-request
+Replaces: libva-v4l2-request
+Provides: libva-driver, libva-v4l2-request (= ${binary:Version})
+Description: VA-API backend for V4L2 stateless decoders (fourier fork)
+ LibVA implementation for the Linux Video4Linux2 Request API, multiplanar
+ fork of bootlin/libva-v4l2-request. Drives rkvdec / hantro / cedrus /
+ rpi-hevc-dec / daedalus_v4l2 stateless decoders for H.264, HEVC, VP8,
+ VP9, AV1, and MPEG-2.
+ .
+ Auto-detected by VAAPI consumers (ffmpeg -hwaccel vaapi, mpv --hwdec=vaapi,
+ Firefox VAAPI accel) when LIBVA_DRIVER_NAME=v4l2_request is set.

debian/libva-v4l2-request-fourier/debian/copyright

@@ -0,0 +1,38 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: libva-v4l2-request-fourier
+Upstream-Contact: Markus Fritsche <fritsche.markus@gmail.com>
+Source: https://git.reauktion.de/marfrit/libva-v4l2-request-fourier
+Comment:
+ Fork of bootlin/libva-v4l2-request with multi-codec / multi-device
+ enhancements for the fourier campaign (RK3399 / RK3588 / RK3566 / BCM2712).
+ Per-file SPDX headers are the canonical declaration; this summary
+ covers the aggregate.
+
+Files: *
+Copyright: 2018 Paul Kocialkowski <paul.kocialkowski@bootlin.com>
+           2018-2026 The libva-v4l2-request authors
+           2024-2026 Markus Fritsche <fritsche.markus@gmail.com>
+License: LGPL-2.1+ or MIT
+
+License: LGPL-2.1+
+ This package is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+ .
+ On Debian systems, the complete text of the GNU Lesser General
+ Public License v2.1 can be found in `/usr/share/common-licenses/LGPL-2.1'.
+
+License: MIT
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ "Software"), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject
+ to the following conditions:
+ .
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+ .
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.

debian/lmcp/build-deb.sh

@@ -7,9 +7,10 @@
 # package (Architecture: all, depends on lua + lua-socket).
 set -euo pipefail
 
-PKGVER=0.5.4
+PKGVER=1.2.1
+UPSTREAM_TAG=v1.2.1
 PKGREL=1
-LMCP_TARBALL_SHA256=af72b8c1d88255456b75d2c53cd5c451a8923417e5498ef31858539397e09caf
+LMCP_TARBALL_SHA256=bf9cce1a84c66b1b74c5aec923c5960d60ae33c221afc8d47ce0d74b8f7ee609
 HERE=$(dirname "$(readlink -f "$0")")
 
 # Reproducible build: pin all file mtimes + ar member timestamps to a fixed
@@ -22,7 +23,7 @@ work=$(mktemp -d)
 trap "rm -rf $work" EXIT
 
 cd "$work"
-curl -sSLfo lmcp.tar.gz "https://git.reauktion.de/marfrit/lmcp/archive/v${PKGVER}.tar.gz"
+curl -sSLfo lmcp.tar.gz "https://git.reauktion.de/marfrit/lmcp/archive/${UPSTREAM_TAG}.tar.gz"
 echo "$LMCP_TARBALL_SHA256  lmcp.tar.gz" | sha256sum -c
 tar xzf lmcp.tar.gz
 

debian/lmcp/debian/changelog

@@ -1,3 +1,83 @@
+lmcp (1.2.1-1) bookworm trixie; urgency=medium
+
+  * tools.d/ plugin scan (closes lmcp#22): server.lua now scans
+    LMCP_TOOLS_DIR (default /opt/lmcp/tools.d on POSIX) for *.lua
+    files and invokes each as a function receiving (server, run).
+    Lets hosts ship local tool extensions alongside the packaged
+    generics without forking server.lua. Existing single-file
+    deployments without a tools.d/ directory: no behaviour change.
+  * LMCP_HOST + LMCP_CONF env vars: packaged server.lua now threads
+    these into lmcp.new(opts.host, opts.conf). Hosts that need
+    single-interface binding (e.g. hertz on 192.168.88.18) or a
+    conf-file-based bearer token (e.g. /opt/herding/etc/hertz-tools.conf)
+    can drive the packaged entrypoint directly via systemd env
+    instead of carrying a forked server.lua.
+  * Together with the above, hertz, ampere, and any future host with
+    custom tools can migrate from /opt/lmcp/server.lua forks to a
+    plain plugin file + standard systemd env. apt upgrade then
+    delivers all packaged improvements automatically.
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Mon, 18 May 2026 01:30:00 +0000
+
+lmcp (1.1.1-1) bookworm trixie; urgency=medium
+
+  * Bug fix: omit empty inputSchema.properties at tool registration.
+    The json.lua empty-table-as-array gotcha (same one that bit
+    `ping` in v1.0.0-rc1) was re-surfacing on tool inputSchemas
+    declared with `properties = {}` — spec-strict MCP clients (Zod)
+    rejected the tools/list with "expected: record, received: array".
+    lmcp:tool() now normalises empty properties tables by dropping
+    the key entirely (JSON Schema permits omitting `properties` on
+    `type:object`, meaning "any object — no constraints").
+    Discovered live on a hertz-tools deployment where two custom
+    no-arg tools (lxc_list, network_status) tripped the Zod check
+    and caused Claude Code to mark the entire MCP endpoint as
+    disconnected.
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Mon, 18 May 2026 00:55:00 +0000
+
+lmcp (1.1.0-1) bookworm trixie; urgency=medium
+
+  * Concurrent handler dispatch (closes #20): tool handlers run in
+    cooperative coroutines. server.lua:run()'s sleep_ms yields to
+    the event loop instead of blocking. Slow shell commands no
+    longer serialise other requests — fast ping during a slow
+    `sleep N` returns in ~10ms (was ~N seconds).
+  * Progress + cancellation notifications (closes #11): tool
+    handler ctx gains progress(p, total?, message?) and cancelled().
+    Client→server notifications/cancelled flips a flag the running
+    handler sees within ~420ms (poll interval capped when ctx
+    present). Cancelled requests get a JSON-RPC -32800 error
+    response (spec wording is "SHOULD NOT respond" but the practical
+    UX wins; see upstream issue for the FD-inheritance trade-off).
+  * Windows MSI build sync (closes #18): windows/sync.sh script
+    refreshes windows/pkg/{lmcp,server,json}.lua from root before
+    WiX is invoked. Closes the drift trap that left the MSI ~6
+    months behind master in April 2026.
+  * Zero handler source-code changes; all existing tools (shell,
+    fetch, web_search, hub remote_*) benefit from concurrency and
+    auto-cancellation transparently via the run() helper.
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Sun, 17 May 2026 19:45:00 +0000
+
+lmcp (1.0.0~rc1-1) bookworm trixie; urgency=medium
+
+  * Full MCP 2025-06-18 surface (release candidate). Closes 14
+    upstream issues. New primitives: Resources, Prompts, Completion,
+    Logging, Sampling, Roots, fetch, web_search. Protocol: cursor
+    pagination, structuredContent, _meta passthrough, tool annotations
+    (readOnlyHint/destructiveHint/idempotentHint/openWorldHint).
+    Transports: stdio (LMCP_TRANSPORT=stdio) for Claude Desktop / IDE
+    clients; full Streamable HTTP rewrite with select()-based event
+    loop, sessions (Mcp-Session-Id), persistent SSE, server-initiated
+    requests, heartbeat, DELETE.
+  * json.lua: UTF-16 surrogate-pair combination + json.empty_object
+    sentinel for spec-correct {} emission (fixes ping's result:[]
+    bug).
+  * Backwards compatible with all existing sessionless-POST clients.
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Sun, 17 May 2026 17:25:00 +0000
+
 lmcp (0.5.4-1) bookworm trixie; urgency=medium
 
   * Ship examples/lmcp.service systemd unit template alongside the

debian/mpv-fourier/0001-meson-add-detection-logic-for-v4l2request-support.patch

@@ -0,0 +1,56 @@
+From 9d3bbd3651eb8405b8609e4f5e8c4978056483d0 Mon Sep 17 00:00:00 2001
+From: Jonas Karlman <jonas@kwiboo.se>
+Date: Sun, 18 Aug 2024 17:42:14 -0700
+Subject: [PATCH 1/2] meson: add detection logic for v4l2request support
+
+We will probably adjust this to look for a specific libavutil version after
+v4l2request support is merged upstream, but this check is fine for now.
+---
+ meson.build   | 11 +++++++++++
+ meson.options |  1 +
+ 2 files changed, 12 insertions(+)
+
+diff --git a/meson.build b/meson.build
+index d4c75a907f..540f279dc7 100644
+--- a/meson.build
++++ b/meson.build
+@@ -1444,6 +1444,16 @@ if features['ios-gl']
+     sources += files('video/out/hwdec/hwdec_ios_gl.m')
+ endif
+ 
++v4l2request = get_option('v4l2request').require(
++    cc.has_header_symbol('libavutil/hwcontext.h',
++                         'AV_HWDEVICE_TYPE_V4L2REQUEST',
++                         dependencies: libavutil)
++)
++features += {'v4l2request': v4l2request.allowed()}
++if features['v4l2request']
++    sources += files('video/v4l2request.c')
++endif
++
+ libva = dependency('libva', version: '>= 1.1.0', required: get_option('vaapi'))
+ 
+ vaapi_drm = dependency('libva-drm', version: '>= 1.1.0', required:
+@@ -1911,6 +1921,7 @@ summary({'cocoa': features['cocoa'] and features['swift'],
+          'libmpv': get_option('libmpv'),
+          'lua': features['lua'],
+          'opengl': features['gl'],
++         'v4l2request': features['v4l2request'],
+          'vulkan': features['vulkan'],
+          'wayland': features['wayland'],
+          'x11': features['x11']},
+diff --git a/meson.options b/meson.options
+index 836d16d03f..54ec2dccfc 100644
+--- a/meson.options
++++ b/meson.options
+@@ -103,6 +103,7 @@ option('d3d-hwaccel', type: 'feature', value: 'auto', description: 'D3D11VA hwac
+ option('d3d9-hwaccel', type: 'feature', value: 'auto', description: 'DXVA2 hwaccel')
+ option('gl-dxinterop-d3d9', type: 'feature', value: 'auto', description: 'OpenGL/DirectX DXVA2 hwaccel')
+ option('ios-gl', type: 'feature', value: 'auto', description: 'iOS OpenGL ES interop support')
++option('v4l2request', type: 'feature', value: 'auto', description: 'V4L2 Request API hwaccel')
+ option('videotoolbox-gl', type: 'feature', value: 'auto', description: 'Videotoolbox with OpenGL')
+ option('videotoolbox-pl', type: 'feature', value: 'auto', description: 'Videotoolbox with libplacebo')
+ 
+-- 
+2.52.0
+

debian/mpv-fourier/0001-vo_dmabuf_wayland-explicit-cache-sync-on-import-fd.patch

@@ -0,0 +1,81 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Markus Fritsche <fritsche.markus@gmail.com>
+Date: Fri, 8 May 2026 23:30:00 +0000
+Subject: [PATCH] vo_dmabuf_wayland: explicit DMA_BUF_IOCTL_SYNC on import fds
+
+V4L2 does not attach implicit fences (dma_resv) to CAPTURE buffers
+on VIDIOC_DQBUF. When the buffer is forwarded to a Wayland compositor
+that imports it via wl_dmabuf and samples in the GPU, the GPU may
+read from physical memory before the producer's writes have flushed,
+producing all-zero output (manifests as solid green for BT.601
+limited-range YUV(0,0,0) -> RGB(0, 135, 0) on the consumer side).
+
+Issue an explicit DMA_BUF_IOCTL_SYNC(SYNC_START|SYNC_RW) +
+SYNC_END(SYNC_RW) round-trip on each unique dma_buf fd before
+zwp_linux_buffer_params_v1_add(). This invokes the producer driver's
+dma_buf_ops->begin_cpu_access / end_cpu_access, which on most ARM
+SoCs flushes write buffers and synchronizes coherent memory before
+the compositor's GPU import.
+
+This is a userspace workaround. Root cause is the missing implicit
+fence on V4L2 CAPTURE DQBUF and is being addressed upstream via
+the vb2_dma_resv RFC.
+
+Without this patch, on RK3566 (hantro VPU + Mali-G52 panfrost +
+KDE Plasma 6 / KWin 6.6.4), `mpv --hwdec=vaapi --vo=dmabuf-wayland`
+shows solid green frames for all hardware-decoded content. With
+this patch, decoded frames are presented correctly.
+
+Signed-off-by: Markus Fritsche <fritsche.markus@gmail.com>
+---
+diff --git a/video/out/vo_dmabuf_wayland.c b/video/out/vo_dmabuf_wayland.c
+index 6b7c511..16e3d18 100644
+--- a/video/out/vo_dmabuf_wayland.c
++++ b/video/out/vo_dmabuf_wayland.c
+@@ -27,6 +27,12 @@
+ #include <va/va_drmcommon.h>
+ #endif
+ 
++/* fourier patch: explicit dma_buf cache sync workaround for missing
++ * implicit-fence on V4L2 stateless CAPTURE buffers. Applies to both
++ * VAAPI and DRMPrime import paths. */
++#include <linux/dma-buf.h>
++#include <sys/ioctl.h>
++
+ #include "gpu/hwdec.h"
+ #include "gpu/video.h"
+ #include "mpv_talloc.h"
+@@ -205,6 +211,14 @@ static void vaapi_dmabuf_importer(struct buffer *buf, struct mp_image *src,
+         buf->drm_format = 0;
+         goto done;
+     }
++    /* fourier patch: explicit cache coherency sync on each dma_buf fd
++     * before submitting to the compositor. See top-of-file comment. */
++    for (int obj_no = 0; obj_no < desc.num_objects; obj_no++) {
++        struct dma_buf_sync sync = { .flags = DMA_BUF_SYNC_START | DMA_BUF_SYNC_RW };
++        (void)ioctl(desc.objects[obj_no].fd, DMA_BUF_IOCTL_SYNC, &sync);
++        sync.flags = DMA_BUF_SYNC_END | DMA_BUF_SYNC_RW;
++        (void)ioctl(desc.objects[obj_no].fd, DMA_BUF_IOCTL_SYNC, &sync);
++    }
+     for (int plane_no = 0; plane_no < desc.layers[layer_no].num_planes; ++plane_no) {
+         int object = desc.layers[layer_no].object_index[plane_no];
+         uint64_t modifier = desc.objects[object].drm_format_modifier;
+@@ -258,6 +272,16 @@ static void drmprime_dmabuf_importer(struct buffer *buf, struct mp_image *src,
+         return;
+ 
+     buf->id = drmprime_surface_id(src);
++
++    /* fourier patch: explicit cache coherency sync on each dma_buf fd
++     * before submitting to the compositor. See top-of-file comment. */
++    for (int obj_no = 0; obj_no < desc->nb_objects; obj_no++) {
++        struct dma_buf_sync sync = { .flags = DMA_BUF_SYNC_START | DMA_BUF_SYNC_RW };
++        (void)ioctl(desc->objects[obj_no].fd, DMA_BUF_IOCTL_SYNC, &sync);
++        sync.flags = DMA_BUF_SYNC_END | DMA_BUF_SYNC_RW;
++        (void)ioctl(desc->objects[obj_no].fd, DMA_BUF_IOCTL_SYNC, &sync);
++    }
++
+     for (layer_no = 0; layer_no < desc->nb_layers; layer_no++) {
+         AVDRMLayerDescriptor layer = desc->layers[layer_no];
+ 
+-- 
+2.51.0

debian/mpv-fourier/0002-vo-hwdec-drmprime-add-separate-hwdecs-for-v4l2reques.patch

@@ -0,0 +1,435 @@
+From dd1e1fd6fe884d66c49dc26af715e1423c7471a3 Mon Sep 17 00:00:00 2001
+From: Philip Langdale <philipl@overt.org>
+Date: Sun, 18 Aug 2024 17:43:41 -0700
+Subject: [PATCH 2/2] vo: hwdec: drmprime: add separate hwdecs for v4l2request
+
+With all the machinery in place, we can now add the v4l2request hwdecs with a
+different hw device type, and a different initialisation path. This applies to
+both the drmprime and drmprime_overlay hwdecs.
+
+At the moment, the device initialisation is done in the bare minimum way, but
+it can be extended to take a device path (for example) if that makes sense as
+we better understand what meaningful configuration will be.
+
+Co-authored-by: Jonas Karlman <jonas@kwiboo.se>
+---
+ video/hwdec.c                            |   3 +
+ video/hwdec.h                            |   1 +
+ video/out/gpu/hwdec.c                    |   6 ++
+ video/out/hwdec/hwdec_drmprime.c         | 125 +++++++++++++++++------
+ video/out/hwdec/hwdec_drmprime_overlay.c |  81 +++++++++++++--
+ video/out/vo_dmabuf_wayland.c            |   1 +
+ video/v4l2request.c                      |  34 ++++++
+ 7 files changed, 210 insertions(+), 41 deletions(-)
+ create mode 100644 video/v4l2request.c
+
+diff --git a/video/hwdec.c b/video/hwdec.c
+index deba518e82..de2ffecc40 100644
+--- a/video/hwdec.c
++++ b/video/hwdec.c
+@@ -125,6 +125,9 @@ static const struct hwcontext_fns *const hwcontext_fns[] = {
+ #if HAVE_DRM
+     &hwcontext_fns_drmprime,
+ #endif
++#if HAVE_V4L2REQUEST
++    &hwcontext_fns_v4l2request,
++#endif
+ #if HAVE_VAAPI
+     &hwcontext_fns_vaapi,
+ #endif
+diff --git a/video/hwdec.h b/video/hwdec.h
+index e7734e5d7e..bf337389cb 100644
+--- a/video/hwdec.h
++++ b/video/hwdec.h
+@@ -119,6 +119,7 @@ extern const struct hwcontext_fns hwcontext_fns_cuda;
+ extern const struct hwcontext_fns hwcontext_fns_d3d11;
+ extern const struct hwcontext_fns hwcontext_fns_drmprime;
+ extern const struct hwcontext_fns hwcontext_fns_dxva2;
++extern const struct hwcontext_fns hwcontext_fns_v4l2request;
+ extern const struct hwcontext_fns hwcontext_fns_vaapi;
+ extern const struct hwcontext_fns hwcontext_fns_vdpau;
+ 
+diff --git a/video/out/gpu/hwdec.c b/video/out/gpu/hwdec.c
+index be39c507d0..f50b927851 100644
+--- a/video/out/gpu/hwdec.c
++++ b/video/out/gpu/hwdec.c
+@@ -38,6 +38,8 @@ extern const struct ra_hwdec_driver ra_hwdec_drmprime;
+ extern const struct ra_hwdec_driver ra_hwdec_drmprime_overlay;
+ extern const struct ra_hwdec_driver ra_hwdec_aimagereader;
+ extern const struct ra_hwdec_driver ra_hwdec_vulkan;
++extern const struct ra_hwdec_driver ra_hwdec_v4l2request;
++extern const struct ra_hwdec_driver ra_hwdec_v4l2request_overlay;
+ 
+ const struct ra_hwdec_driver *const ra_hwdec_drivers[] = {
+ #if HAVE_D3D_HWACCEL
+@@ -73,6 +75,10 @@ const struct ra_hwdec_driver *const ra_hwdec_drivers[] = {
+     &ra_hwdec_drmprime,
+     &ra_hwdec_drmprime_overlay,
+ #endif
++#if HAVE_V4L2REQUEST
++    &ra_hwdec_v4l2request,
++    &ra_hwdec_v4l2request_overlay,
++#endif
+ #if HAVE_ANDROID_MEDIA_NDK
+     &ra_hwdec_aimagereader,
+ #endif
+diff --git a/video/out/hwdec/hwdec_drmprime.c b/video/out/hwdec/hwdec_drmprime.c
+index 7869eb124a..446f63de44 100644
+--- a/video/out/hwdec/hwdec_drmprime.c
++++ b/video/out/hwdec/hwdec_drmprime.c
+@@ -77,7 +77,7 @@ static const char *forked_pix_fmt_names[] = {
+     "rpi4_10",
+ };
+ 
+-static int init(struct ra_hwdec *hw)
++static int pre_init(struct ra_hwdec *hw)
+ {
+     struct priv_owner *p = hw->priv;
+ 
+@@ -92,36 +92,12 @@ static int init(struct ra_hwdec *hw)
+         return -1;
+     }
+ 
+-    /*
+-     * The drm_params resource is not provided when using X11 or Wayland, but
+-     * there are extensions that supposedly provide this information from the
+-     * drivers. Not properly documented. Of course.
+-     */
+-    mpv_opengl_drm_params_v2 *params = ra_get_native_resource(hw->ra_ctx->ra,
+-                                                              "drm_params_v2");
+-
+-    /*
+-     * Respect drm_device option, so there is a way to control this when not
+-     * using a DRM gpu context. If drm_params_v2 are present, they will already
+-     * respect this option.
+-     */
+-    void *tmp = talloc_new(NULL);
+-    struct drm_opts *drm_opts = mp_get_config_group(tmp, hw->global, &drm_conf);
+-    const char *opt_path = drm_opts->device_path;
+-
+-    const char *device_path = params && params->render_fd > -1 ?
+-                              drmGetRenderDeviceNameFromFd(params->render_fd) :
+-                              opt_path ? opt_path : "/dev/dri/renderD128";
+-    MP_VERBOSE(hw, "Using DRM device: %s\n", device_path);
++    return 0;
++}
+ 
+-    int ret = av_hwdevice_ctx_create(&p->hwctx.av_device_ref,
+-                                     AV_HWDEVICE_TYPE_DRM,
+-                                     device_path, NULL, 0);
+-    talloc_free(tmp);
+-    if (ret != 0) {
+-        MP_VERBOSE(hw, "Failed to create hwdevice_ctx: %s\n", av_err2str(ret));
+-        return -1;
+-    }
++static int post_init(struct ra_hwdec *hw)
++{
++    struct priv_owner *p = hw->priv;
+ 
+     /*
+      * At the moment, there is no way to discover compatible formats
+@@ -154,6 +130,75 @@ static int init(struct ra_hwdec *hw)
+     return 0;
+ }
+ 
++static int init_drmprime(struct ra_hwdec *hw)
++{
++    struct priv_owner *p = hw->priv;
++
++    int ret = pre_init(hw);
++    if (ret < 0)
++        return ret;
++
++    /*
++     * The drm_params resource is not provided when using X11 or Wayland, but
++     * there are extensions that supposedly provide this information from the
++     * drivers. Not properly documented. Of course.
++     */
++    mpv_opengl_drm_params_v2 *params = ra_get_native_resource(hw->ra_ctx->ra,
++                                                              "drm_params_v2");
++
++    /*
++     * Respect drm_device option, so there is a way to control this when not
++     * using a DRM gpu context. If drm_params_v2 are present, they will already
++     * respect this option.
++     */
++    void *tmp = talloc_new(NULL);
++    struct drm_opts *drm_opts = mp_get_config_group(tmp, hw->global, &drm_conf);
++    const char *opt_path = drm_opts->device_path;
++
++    const char *device_path = params && params->render_fd > -1 ?
++                              drmGetRenderDeviceNameFromFd(params->render_fd) :
++                              opt_path ? opt_path : "/dev/dri/renderD128";
++    MP_VERBOSE(hw, "Using DRM device: %s\n", device_path);
++
++    ret = av_hwdevice_ctx_create(&p->hwctx.av_device_ref,
++                                 AV_HWDEVICE_TYPE_DRM,
++                                 device_path, NULL, 0);
++    talloc_free(tmp);
++    if (ret < 0) {
++        MP_VERBOSE(hw, "Failed to create hwdevice_ctx: %s\n", av_err2str(ret));
++        return ret;
++    }
++
++    return post_init(hw);
++}
++
++#if HAVE_V4L2REQUEST
++static int init_v4l2request(struct ra_hwdec *hw)
++{
++    struct priv_owner *p = hw->priv;
++
++    int ret = pre_init(hw);
++    if (ret < 0)
++        return ret;
++
++    /*
++     * AVCodecHWConfig contains a combo of a pixel format and hwdevice type,
++     * correct type must be created here or hwaccel will fail.
++     *
++     * FIXME: Create hwdevice based on type in AVCodecHWConfig
++     */
++    ret = av_hwdevice_ctx_create(&p->hwctx.av_device_ref,
++                                 AV_HWDEVICE_TYPE_V4L2REQUEST,
++                                 NULL, NULL, 0);
++    if (ret < 0) {
++        MP_VERBOSE(hw, "Failed to create hwdevice_ctx: %s\n", av_err2str(ret));
++        return ret;
++    }
++
++    return post_init(hw);
++}
++#endif
++
+ static void mapper_unmap(struct ra_hwdec_mapper *mapper)
+ {
+     struct priv_owner *p_owner = mapper->owner->priv;
+@@ -308,7 +353,7 @@ const struct ra_hwdec_driver ra_hwdec_drmprime = {
+     .priv_size = sizeof(struct priv_owner),
+     .imgfmts = {IMGFMT_DRMPRIME, 0},
+     .device_type = AV_HWDEVICE_TYPE_DRM,
+-    .init = init,
++    .init = init_drmprime,
+     .uninit = uninit,
+     .mapper = &(const struct ra_hwdec_mapper_driver){
+         .priv_size = sizeof(struct dmabuf_interop_priv),
+@@ -318,3 +363,21 @@ const struct ra_hwdec_driver ra_hwdec_drmprime = {
+         .unmap = mapper_unmap,
+     },
+ };
++
++#if HAVE_V4L2REQUEST
++const struct ra_hwdec_driver ra_hwdec_v4l2request = {
++    .name = "v4l2request",
++    .priv_size = sizeof(struct priv_owner),
++    .imgfmts = {IMGFMT_DRMPRIME, 0},
++    .device_type = AV_HWDEVICE_TYPE_V4L2REQUEST,
++    .init = init_v4l2request,
++    .uninit = uninit,
++    .mapper = &(const struct ra_hwdec_mapper_driver){
++        .priv_size = sizeof(struct dmabuf_interop_priv),
++        .init = mapper_init,
++        .uninit = mapper_uninit,
++        .map = mapper_map,
++        .unmap = mapper_unmap,
++    },
++};
++#endif
+diff --git a/video/out/hwdec/hwdec_drmprime_overlay.c b/video/out/hwdec/hwdec_drmprime_overlay.c
+index 61514f8e89..689e9b04e5 100644
+--- a/video/out/hwdec/hwdec_drmprime_overlay.c
++++ b/video/out/hwdec/hwdec_drmprime_overlay.c
+@@ -246,7 +246,7 @@ static void uninit(struct ra_hwdec *hw)
+     }
+ }
+ 
+-static int init(struct ra_hwdec *hw)
++static int pre_init(struct ra_hwdec *hw)
+ {
+     struct priv *p = hw->priv;
+     int draw_plane, drmprime_video_plane;
+@@ -267,15 +267,15 @@ static int init(struct ra_hwdec *hw)
+                                            drm_params->connector_id, draw_plane, drmprime_video_plane);
+         if (!p->ctx) {
+             mp_err(p->log, "Failed to retrieve DRM atomic context.\n");
+-            goto err;
++            return -1;
+         }
+         if (!p->ctx->drmprime_video_plane) {
+             mp_warn(p->log, "No drmprime video plane. You might need to specify it manually using --drm-drmprime-video-plane\n");
+-            goto err;
++            return -1;
+         }
+     } else {
+         mp_verbose(p->log, "Failed to retrieve DRM fd from native display.\n");
+-        goto err;
++        return -1;
+     }
+ 
+     drmModeCrtcPtr crtc;
+@@ -289,7 +289,7 @@ static int init(struct ra_hwdec *hw)
+     uint64_t has_prime;
+     if (drmGetCap(p->ctx->fd, DRM_CAP_PRIME, &has_prime) < 0) {
+         MP_ERR(hw, "Card does not support prime handles.\n");
+-        goto err;
++        return -1;
+     }
+ 
+     if (has_prime) {
+@@ -298,19 +298,67 @@ static int init(struct ra_hwdec *hw)
+ 
+     disable_video_plane(hw);
+ 
++    return 0;
++}
++
++static int init_drmprime(struct ra_hwdec *hw)
++{
++    struct priv *p = hw->priv;
++
++    int ret = pre_init(hw);
++    if (ret < 0)
++        goto err;
++
+     p->hwctx = (struct mp_hwdec_ctx) {
+         .driver_name = hw->driver->name,
+         .hw_imgfmt = IMGFMT_DRMPRIME,
+     };
+ 
+     char *device = drmGetDeviceNameFromFd2(p->ctx->fd);
+-    int ret = av_hwdevice_ctx_create(&p->hwctx.av_device_ref,
+-                                     AV_HWDEVICE_TYPE_DRM, device, NULL, 0);
++    ret = av_hwdevice_ctx_create(&p->hwctx.av_device_ref,
++                                 AV_HWDEVICE_TYPE_DRM, device, NULL, 0);
+ 
+     if (device)
+         free(device);
+ 
+-    if (ret != 0) {
++    if (ret < 0) {
++        MP_VERBOSE(hw, "Failed to create hwdevice_ctx: %s\n", av_err2str(ret));
++        goto err;
++    }
++
++    hwdec_devices_add(hw->devs, &p->hwctx);
++
++    return 0;
++
++err:
++    uninit(hw);
++    return ret;
++}
++
++#if HAVE_V4L2REQUEST
++static int init_v4l2request(struct ra_hwdec *hw)
++{
++    struct priv *p = hw->priv;
++
++    int ret = pre_init(hw);
++    if (ret < 0)
++        goto err;
++
++    p->hwctx = (struct mp_hwdec_ctx) {
++        .driver_name = hw->driver->name,
++        .hw_imgfmt = IMGFMT_DRMPRIME,
++    };
++
++    /*
++     * AVCodecHWConfig contains a combo of a pixel format and hwdevice type,
++     * correct type must be created here or hwaccel will fail.
++     *
++     * FIXME: Create hwdevice based on type in AVCodecHWConfig
++     */
++    ret = av_hwdevice_ctx_create(&p->hwctx.av_device_ref,
++                                 AV_HWDEVICE_TYPE_V4L2REQUEST,
++                                 NULL, NULL, 0);
++    if (ret < 0) {
+         MP_VERBOSE(hw, "Failed to create hwdevice_ctx: %s\n", av_err2str(ret));
+         goto err;
+     }
+@@ -321,15 +369,28 @@ static int init(struct ra_hwdec *hw)
+ 
+ err:
+     uninit(hw);
+-    return -1;
++    return ret;
+ }
++#endif
+ 
+ const struct ra_hwdec_driver ra_hwdec_drmprime_overlay = {
+     .name = "drmprime-overlay",
+     .priv_size = sizeof(struct priv),
+     .imgfmts = {IMGFMT_DRMPRIME, 0},
+     .device_type = AV_HWDEVICE_TYPE_DRM,
+-    .init = init,
++    .init = init_drmprime,
++    .overlay_frame = overlay_frame,
++    .uninit = uninit,
++};
++
++#if HAVE_V4L2REQUEST
++const struct ra_hwdec_driver ra_hwdec_v4l2request_overlay = {
++    .name = "v4l2request-overlay",
++    .priv_size = sizeof(struct priv),
++    .imgfmts = {IMGFMT_DRMPRIME, 0},
++    .device_type = AV_HWDEVICE_TYPE_V4L2REQUEST,
++    .init = init_v4l2request,
+     .overlay_frame = overlay_frame,
+     .uninit = uninit,
+ };
++#endif
+diff --git a/video/out/vo_dmabuf_wayland.c b/video/out/vo_dmabuf_wayland.c
+index 9b06643544..6d62849568 100644
+--- a/video/out/vo_dmabuf_wayland.c
++++ b/video/out/vo_dmabuf_wayland.c
+@@ -860,6 +860,7 @@ static int preinit(struct vo *vo)
+     // Initialize all possible hwdec drivers.
+     ra_hwdec_ctx_init(&p->hwdec_ctx, vo->hwdec_devs, "vaapi", false);
+     ra_hwdec_ctx_init(&p->hwdec_ctx, vo->hwdec_devs, "drmprime", false);
++    ra_hwdec_ctx_init(&p->hwdec_ctx, vo->hwdec_devs, "v4l2request", false);
+ 
+     p->src = (struct mp_rect){0, 0, 0, 0};
+     return 0;
+diff --git a/video/v4l2request.c b/video/v4l2request.c
+new file mode 100644
+index 0000000000..2aa4d14fea
+--- /dev/null
++++ b/video/v4l2request.c
+@@ -0,0 +1,34 @@
++/*
++ * This file is part of mpv.
++ *
++ * mpv is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU Lesser General Public
++ * License as published by the Free Software Foundation; either
++ * version 2.1 of the License, or (at your option) any later version.
++ *
++ * mpv is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
++ * GNU Lesser General Public License for more details.
++ *
++ * You should have received a copy of the GNU Lesser General Public
++ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
++ */
++
++#include <libavutil/hwcontext.h>
++
++#include "hwdec.h"
++
++static struct AVBufferRef *v4l2request_create_standalone(struct mpv_global *global,
++        struct mp_log *log, struct hwcontext_create_dev_params *params)
++{
++    AVBufferRef* ref = NULL;
++    av_hwdevice_ctx_create(&ref, AV_HWDEVICE_TYPE_V4L2REQUEST, NULL, NULL, 0);
++
++    return ref;
++}
++
++const struct hwcontext_fns hwcontext_fns_v4l2request = {
++    .av_hwdevice_type = AV_HWDEVICE_TYPE_V4L2REQUEST,
++    .create_dev = v4l2request_create_standalone,
++};
+-- 
+2.52.0
+

debian/mpv-fourier/build-deb.sh

@@ -0,0 +1,134 @@
+#!/bin/bash
+# Build mpv-fourier_<ver>_arm64.deb (mpv with v4l2request hwdec wiring +
+# vo_dmabuf_wayland cache-sync fix).
+#
+# Mirror of arch/mpv-fourier into the Debian tree.  Same source pin
+# (mpv 0.41.0), same 3 patches, same meson options.
+#
+# Depends on ffmpeg-v4l2-request-fourier for the libavcodec backing
+# library — the v4l2request hwdec mpv now offers requires
+# AV_HWDEVICE_TYPE_V4L2REQUEST which only exists in Kwiboo's FFmpeg
+# fork, not in Debian stock ffmpeg.
+#
+# Conflicts: mpv — drop-in replacement.  Pi 5 / CM5 hosts using stock
+# Firefox + VAAPI don't need this; the firefox-fourier / kdirect
+# bench-test paths do.
+#
+# Sibling Arch package: ../../arch/mpv-fourier/PKGBUILD
+# Sibling FFmpeg package: ../ffmpeg-v4l2-request-fourier/build-deb.sh
+# Upstream: https://github.com/mpv-player/mpv
+set -euo pipefail
+
+MPV_VERSION=0.41.0
+PKGVER=1:${MPV_VERSION}+rfourier
+PKGREL=1
+MPV_TARBALL_SHA256=ee21092a5ee427353392360929dc64645c54479aefdb5babc5cfbb5fad626209
+
+HERE=$(dirname "$(readlink -f "$0")")
+
+# Reproducible build.  2026-05-18 23:00 UTC — Phase 8.13 close.
+export SOURCE_DATE_EPOCH=1779231600
+
+work=$(mktemp -d)
+trap "rm -rf $work" EXIT
+
+cd "$work"
+curl -sSLfo mpv.tar.gz \
+    "https://github.com/mpv-player/mpv/archive/v${MPV_VERSION}/mpv-${MPV_VERSION}.tar.gz"
+echo "$MPV_TARBALL_SHA256  mpv.tar.gz" | sha256sum -c
+tar xzf mpv.tar.gz
+
+cd "mpv-${MPV_VERSION}"
+
+# Apply the 3 fourier patches.
+patch -p1 < "$HERE/0001-meson-add-detection-logic-for-v4l2request-support.patch"
+patch -p1 < "$HERE/0002-vo-hwdec-drmprime-add-separate-hwdecs-for-v4l2reques.patch"
+patch -p1 < "$HERE/0001-vo_dmabuf_wayland-explicit-cache-sync-on-import-fd.patch"
+
+# Configure.  Same shape as arch/mpv-fourier's meson options.
+meson setup build \
+    --prefix=/usr \
+    --libdir=lib/aarch64-linux-gnu \
+    --buildtype=release \
+    --auto-features=auto \
+    -Dv4l2request=enabled \
+    -Dlibmpv=true \
+    -Dgl-x11=enabled \
+    -Dcaca=disabled \
+    -Dcdda=enabled \
+    -Ddrm=enabled \
+    -Ddvbin=enabled \
+    -Ddvdnav=enabled \
+    -Dlibarchive=enabled \
+    -Dopenal=enabled \
+    -Dsdl2-audio=enabled \
+    -Dsdl2-video=enabled \
+    -Dsdl2-gamepad=enabled
+
+meson compile -C build -j"$(nproc)"
+
+# Stage
+ROOT="$work/pkgroot"
+DESTDIR="$ROOT" meson install -C build
+
+# Drop private linkage entries from the .pc (only matter for static linking).
+sed -i -e '/Requires.private/d' -e '/Libs.private/d' \
+    "$ROOT/usr/lib/aarch64-linux-gnu/pkgconfig/mpv.pc"
+
+# Docs
+mkdir -p "$ROOT/usr/share/doc/mpv-fourier" "$ROOT/DEBIAN"
+install -m 644 DOCS/encoding.rst "$ROOT/usr/share/doc/mpv-fourier/"
+install -m 644 DOCS/tech-overview.txt "$ROOT/usr/share/doc/mpv-fourier/"
+install -Dm644 "$HERE/debian/copyright" "$ROOT/usr/share/doc/mpv-fourier/copyright"
+install -Dm644 "$HERE/debian/changelog" "$ROOT/usr/share/doc/mpv-fourier/changelog.Debian"
+gzip -9 -n "$ROOT/usr/share/doc/mpv-fourier/changelog.Debian"
+
+# TOOLS scripts
+mkdir -p "$ROOT/usr/share/mpv/scripts"
+install -m 644 TOOLS/umpv TOOLS/mpv_identify.sh TOOLS/stats-conv.py TOOLS/idet.sh \
+    "$ROOT/usr/share/mpv/scripts/" 2>/dev/null || true
+[ -d TOOLS/lua ] && cp TOOLS/lua/* "$ROOT/usr/share/mpv/scripts/" 2>/dev/null || true
+
+cat > "$ROOT/DEBIAN/control" <<EOF
+Package: mpv-fourier
+Version: ${PKGVER}-${PKGREL}
+Section: video
+Priority: optional
+Architecture: arm64
+Depends: ffmpeg-v4l2-request-fourier (>= 2:8.1+rfourier),
+         libc6, libdrm2,
+         libass9, libbluray2, libcdio19, libcdio-paranoia2,
+         libdvdnav4, libdvdread8,
+         libegl1, libgl1, libjpeg62-turbo | libjpeg62,
+         libplacebo338 | libplacebo208,
+         libpulse0, libsixel1, libluajit-5.1-2,
+         libmujs3 | libmujs2 | libmujs1,
+         libpipewire-0.3-0, librubberband2, libsdl2-2.0-0,
+         libopenal1, libuchardet0, libvulkan1,
+         libwayland-client0, libwayland-egl1, libwayland-cursor0,
+         libxkbcommon0, libxext6, libxpresent1,
+         libxrandr2, libxss1, libxv1, libx11-6,
+         zlib1g
+Conflicts: mpv, libmpv2 | libmpv1
+Replaces: mpv, libmpv2, libmpv1
+Provides: mpv (= ${PKGVER}-${PKGREL}), libmpv.so.2
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Homepage: https://mpv.io/
+Description: mpv media player with V4L2-Request hwdec (fourier fork)
+ mpv ${MPV_VERSION} patched with:
+   - Kwiboo + Langdale v4l2request hwdec wiring (meson detection +
+     vo_hwdec_drmprime separate hwdec instance for AV_HWDEVICE_TYPE_
+     V4L2REQUEST) so '--hwdec=v4l2request' actually engages on
+     dmabuf-wayland.
+   - vo_dmabuf_wayland explicit DMA_BUF_IOCTL_SYNC on import fds
+     (iter1 of dmabuf-modifier-triage) — workaround for missing
+     implicit-fence on V4L2 stateless CAPTURE buffers.  Fixes the
+     KWin-on-RK3566 dark-green chroma readback regression on ohm.
+ .
+ Requires ffmpeg-v4l2-request-fourier as the backing libavcodec.
+ Stock Debian ffmpeg does not provide AV_HWDEVICE_TYPE_V4L2REQUEST.
+EOF
+
+DEB_OUT="mpv-fourier_${PKGVER//:/%3a}-${PKGREL}_arm64.deb"
+dpkg-deb --root-owner-group --build "$ROOT" "$HERE/$DEB_OUT"
+echo "built: $HERE/$DEB_OUT"

debian/mpv-fourier/debian/changelog

@@ -0,0 +1,12 @@
+mpv-fourier (1:0.41.0+rfourier-1) bookworm trixie; urgency=medium
+
+  * Initial Debian packaging for mpv with the fourier-umbrella patches.
+  * Mirror of arch/mpv-fourier (same source tarball pin 0.41.0,
+    same 3 patches: v4l2request meson detection, drmprime hwdec
+    wiring, vo_dmabuf_wayland explicit cache-sync).
+  * Depends on ffmpeg-v4l2-request-fourier (>= 2:8.1+rfourier) — the
+    v4l2request hwdec requires AV_HWDEVICE_TYPE_V4L2REQUEST which
+    only exists in Kwiboo's FFmpeg fork.
+  * Drop-in replacement for Debian's stock mpv; takes epoch 1.
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Mon, 18 May 2026 23:00:00 +0000

debian/mpv-fourier/debian/control

@@ -0,0 +1,70 @@
+Source: mpv-fourier
+Section: video
+Priority: optional
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Build-Depends: debhelper-compat (= 13),
+               meson (>= 1.0),
+               ninja-build,
+               pkg-config,
+               python3-docutils,
+               ffmpeg-v4l2-request-fourier (>= 2:8.1+rfourier),
+               libdrm-dev,
+               libass-dev,
+               libbluray-dev,
+               libcdio-dev,
+               libcdio-paranoia-dev,
+               libdvdnav-dev,
+               libdvdread-dev,
+               libegl-dev,
+               libgl-dev,
+               libjpeg-dev,
+               libplacebo-dev,
+               libpulse-dev,
+               libsixel-dev,
+               libluajit-5.1-dev,
+               libmujs-dev,
+               libpipewire-0.3-dev,
+               librubberband-dev,
+               libsdl2-dev,
+               libopenal-dev,
+               libuchardet-dev,
+               libvulkan-dev,
+               libwayland-dev,
+               wayland-protocols,
+               libxkbcommon-dev,
+               libxext-dev,
+               libxpresent-dev,
+               libxrandr-dev,
+               libxss-dev,
+               libxv-dev,
+               libx11-dev,
+               libv4l-dev,
+               libudev-dev,
+               libsystemd-dev,
+               libarchive-dev,
+               libxml2-dev,
+               libdvbpsi-dev,
+               zlib1g-dev
+Standards-Version: 4.6.2
+Homepage: https://mpv.io/
+
+Package: mpv-fourier
+Architecture: arm64
+Depends: ${misc:Depends}, ${shlibs:Depends},
+         ffmpeg-v4l2-request-fourier (>= 2:8.1+rfourier)
+Conflicts: mpv, libmpv2, libmpv1
+Replaces: mpv, libmpv2, libmpv1
+Provides: mpv (= ${binary:Version}), libmpv.so.2
+Description: mpv media player with V4L2-Request hwdec (fourier fork)
+ mpv 0.41.0 patched with:
+   - Kwiboo + Langdale v4l2request hwdec wiring (meson detection +
+     vo_hwdec_drmprime separate hwdec instance for AV_HWDEVICE_TYPE_
+     V4L2REQUEST) so '--hwdec=v4l2request' actually engages on
+     dmabuf-wayland.
+   - vo_dmabuf_wayland explicit DMA_BUF_IOCTL_SYNC on import fds
+     (iter1 of dmabuf-modifier-triage) — workaround for missing
+     implicit-fence on V4L2 stateless CAPTURE buffers. Fixes the
+     KWin-on-RK3566 dark-green chroma readback regression on ohm.
+ .
+ Requires ffmpeg-v4l2-request-fourier as the backing libavcodec.
+ Stock Debian ffmpeg does not provide AV_HWDEVICE_TYPE_V4L2REQUEST.

debian/mpv-fourier/debian/copyright

@@ -0,0 +1,25 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: mpv
+Upstream-Contact: https://github.com/mpv-player/mpv/issues
+Source: https://github.com/mpv-player/mpv
+
+Files: *
+Copyright: 2000-2026 The mpv developers
+License: GPL-2.0-or-later AND LGPL-2.1-or-later
+
+Files: 0001-meson-add-detection-logic-for-v4l2request-support.patch
+       0002-vo-hwdec-drmprime-add-separate-hwdecs-for-v4l2reques.patch
+Copyright: 2024 Kwiboo, Niklas Haas, contributors
+License: LGPL-2.1-or-later
+
+Files: 0001-vo_dmabuf_wayland-explicit-cache-sync-on-import-fd.patch
+Copyright: 2026 Markus Fritsche <fritsche.markus@gmail.com>
+License: LGPL-2.1-or-later
+
+License: GPL-2.0-or-later
+ On Debian systems, the complete text of the GNU General Public
+ License v2 can be found in `/usr/share/common-licenses/GPL-2'.
+
+License: LGPL-2.1-or-later
+ On Debian systems, the complete text of the GNU Lesser General
+ Public License v2.1 can be found in `/usr/share/common-licenses/LGPL-2.1'.