daedalus-v4l2: 5d8b436 -> 77e14e5 — picks up #12 (LOW_DELAY) + #13 (daedalus-fourier linkage)

Daemon-only bump (no daedalus-v4l2-dkms change needed; PROTO_VERSION
stays at 0).

#12 (LOW_DELAY half-measure): daemon sets AV_CODEC_FLAG_LOW_DELAY on
the H.264 AVCodecContext so libavcodec emits frames in decode order
~99% of the time (a few stragglers at GOP boundaries when the
stream's SPS num_reorder_frames overrides the flag).  Visible
improvement vs the 2-1-4-3 pair-swap on Firefox + mpv playback;
not the permanent fix — see daedalus-v4l2#11 for the architectural
plan to substitute daedalus-fourier kernels for libavcodec's
pixel math one cycle at a time.

#13 (daedalus-fourier linkage): daemon now pkg-config-links against
the daedalus-fourier kernel library (marfrit/daedalus-fourier) and
logs substrate availability at startup.  No kernels dispatched yet
— this is the build-time foundation for the substitution work.

build-deb.sh updated to fetch + build + install daedalus-fourier
(pinned at d87239d, marfrit/daedalus-fourier PR #1) into a per-
build temp prefix before invoking the daemon's cmake, exposing it
via PKG_CONFIG_PATH.  Static-linked, so the resulting .deb has no
new runtime deps.  Requires libvulkan-dev + glslang-tools on the
CI runner.

Arch PKGBUILD bumped to the same upstream commit but Arch packaging
for daedalus-fourier itself is a follow-up; until that lands the
Arch build expects daedalus-fourier installed by the user (AUR-style).
Debian-side is end-to-end self-contained via build-deb.sh.

Refs:
  * reauktion/daedalus-v4l2#12
  * reauktion/daedalus-v4l2#13
  * reauktion/daedalus-v4l2#11
  * marfrit/daedalus-fourier#1

arch/daedalus-v4l2/PKGBUILD

@@ -16,19 +16,21 @@
 pkgname=daedalus-v4l2
 _upstreampkg=daedalus-v4l2
 
-# Pin the daedalus-v4l2 tip.  5d8b436 = revert of PRs #7 + #8 (the
+# 77e14e5 = post-revert state plus daedalus-v4l2 PRs #12 (LOW_DELAY
-# parking design that broke libva's 1:1 contract — see
+# half-measure for the H.264 display-reorder visual) and #13 (daemon
-# daedalus-v4l2#9 + #10).  Tree is content-equivalent to f0d4186
+# now links daedalus-fourier and logs substrate availability at
-# plus PR #4 (DECODE_MODE / START_CODE menu controls; cosmetic
+# startup).  Daemon now needs `daedalus-fourier` at build time —
-# warning fix).  PROTO_VERSION drops 1 → 0 to match — lock-step
+# Arch packaging for that sibling library is a follow-up; until it
-# install with daedalus-v4l2-dkms 0.1.0.r33.5d8b436 REQUIRED.
+# lands as an AUR-style PKGBUILD, this Arch build expects
-# Proper H.264 reorder fix tracked separately at daedalus-v4l2#11.
+# daedalus-fourier installed to /usr/local (or equivalent) by the
-_commit=5d8b4369e58ab947d1c56b1f718293c57c6065b5
+# user.  See debian/daedalus-v4l2/build-deb.sh for the Debian-side
+# in-build fetch-and-install of daedalus-fourier.
+_commit=77e14e5a192f0eef0b41dd1140205e29d13d4d58
 
 # 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.r33.5d8b436
+pkgver=0.1.0.r37.77e14e5
-pkgrel=1  # reset for new upstream pin (5d8b436 — revert parking design)
+pkgrel=1  # reset for new upstream pin (77e14e5 — daedalus-fourier linkage)
 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"

debian/daedalus-v4l2/build-deb.sh

@@ -11,16 +11,25 @@
 # Upstream repo: https://git.reauktion.de/reauktion/daedalus-v4l2
 set -euo pipefail
 
-# Same pin as the Arch PKGBUILD.  5d8b436 reverts PRs #7 + #8 (the
+# 77e14e5 = post-revert state plus daedalus-v4l2 PRs #12 (LOW_DELAY
-# parking design that broke libva's 1:1 CAPTURE-buffer contract; see
+# half-measure for the H.264 display-reorder visual) and #13 (daemon
-# daedalus-v4l2#9 + #10).  Tree is content-equivalent to f0d4186
+# now links daedalus-fourier and logs substrate availability at
-# plus PR #4 (DECODE_MODE / START_CODE menu controls — cosmetic
+# startup).  PROTO_VERSION stays at 0; daedalus-v4l2-dkms only needs
-# warning fix).  PROTO_VERSION drops 1 → 0; lock-step install with
+# bumping when the kernel module changes (no kmod changes here).
-# daedalus-v4l2-dkms 0.1.0+r33+g5d8b436 REQUIRED.  Proper H.264
+#
-# reorder fix tracked separately at daedalus-v4l2#11.
+# New build-dep: daedalus-fourier kernel library.  Fetched + built +
-UPSTREAM_COMMIT=5d8b4369e58ab947d1c56b1f718293c57c6065b5
+# installed to a per-build temp prefix below, exposed to the daemon
-PKGVER=0.1.0+r33+g5d8b436
+# cmake via PKG_CONFIG_PATH.  Static-linked into the daemon binary,
-PKGREL=1  # reset for new upstream pin (5d8b436 — revert parking design)
+# so the resulting .deb has no runtime dep on daedalus-fourier.
+UPSTREAM_COMMIT=77e14e5a192f0eef0b41dd1140205e29d13d4d58
+PKGVER=0.1.0+r37+g77e14e5
+PKGREL=1  # reset for new upstream pin (77e14e5 — daedalus-fourier linkage)
+
+# daedalus-fourier pin.  d87239d = marfrit/daedalus-fourier PR #1 merge
+# (install rules + pkg-config, enables this consumer to find_package
+# + link).  Bump in lockstep with the upstream daemon when daedalus-
+# fourier's API or installed shaders are changed by a new consumer.
+DAEDALUS_FOURIER_COMMIT=d87239d8172307d9a1b93c95cbed116d175b85cc
 
 HERE=$(dirname "$(readlink -f "$0")")
 
@@ -30,14 +39,37 @@ export SOURCE_DATE_EPOCH=1779231600
 work=$(mktemp -d)
 trap "rm -rf $work" EXIT
 
+# --- daedalus-fourier: fetch + build + install to per-build prefix ---
+#
+# Static-linked into the daemon, so the temp prefix is only for the
+# duration of this build script.  Requires libvulkan-dev + glslang-tools
+# on the runner (already needed for the daedalus-fourier benches).
+FOURIER_PREFIX=$work/fourier-prefix
+mkdir -p "$FOURIER_PREFIX"
+
+cd "$work"
+curl --connect-timeout 10 --max-time 600 --retry 3 --retry-delay 5 -sSLfo daedalus-fourier.tar.gz \
+    "https://git.reauktion.de/marfrit/daedalus-fourier/archive/${DAEDALUS_FOURIER_COMMIT}.tar.gz"
+tar xzf daedalus-fourier.tar.gz
+cd daedalus-fourier
+cmake -B build -G Ninja \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_INSTALL_PREFIX="$FOURIER_PREFIX"
+cmake --build build --target daedalus_core
+cmake --install build
+
+# --- daedalus-v4l2: fetch + build daemon against installed daedalus-fourier ---
+
 cd "$work"
 curl --connect-timeout 10 --max-time 600 --retry 3 --retry-delay 5 -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)
+# Build daemon (CMake) — point pkg-config at the daedalus-fourier
+# temp prefix so pkg_check_modules(DAEDALUS_FOURIER …) resolves to it.
 cd "$SRCDIR/daemon"
+PKG_CONFIG_PATH="$FOURIER_PREFIX/lib/pkgconfig" \
 cmake -B build -G Ninja \
     -DCMAKE_BUILD_TYPE=Release \
     -DCMAKE_INSTALL_PREFIX=/usr

debian/daedalus-v4l2/debian/changelog

@@ -1,3 +1,34 @@
+daedalus-v4l2 (0.1.0+r37+g77e14e5-1) bookworm trixie; urgency=medium
+
+  * Bump to 77e14e5 — picks up daedalus-v4l2 PRs #12 + #13.
+  * #12 (LOW_DELAY half-measure): the daemon now sets
+    AV_CODEC_FLAG_LOW_DELAY on the H.264 AVCodecContext so libavcodec
+    emits frames in decode order ~99% of the time (a few stragglers
+    at GOP boundaries when the stream's SPS num_reorder_frames
+    overrides the flag).  Visible improvement vs the 2-1-4-3
+    pair-swap on Firefox YouTube + mpv playback; not a permanent
+    fix (see #11 for the architectural plan).
+  * #13 (daedalus-fourier linkage): the daemon now pkg-config-links
+    against the daedalus-fourier kernel library (marfrit/
+    daedalus-fourier) and logs substrate availability at startup.
+    No kernels dispatched yet — this is the build-time / link-time
+    foundation for the H.264 daemon-rewrite plan in #11
+    (substituting daedalus-fourier IDCT 4×4 / IDCT 8×8 / luma
+    deblock primitives for libavcodec's per-MB pixel math, one
+    cycle at a time, measuring CPU saved per substitution).
+  * Build-deb.sh now fetches + builds + installs daedalus-fourier
+    (pinned at d87239d, marfrit/daedalus-fourier PR #1) into a
+    per-build temp prefix, then builds the daemon with
+    PKG_CONFIG_PATH pointing at it.  daedalus-fourier is
+    statically linked into the daemon binary, so the resulting
+    .deb has no new runtime deps.  Requires libvulkan-dev +
+    glslang-tools on the CI runner (the daedalus-fourier benches
+    already needed those).
+  * Wire protocol unchanged — DAEDALUS_PROTO_VERSION stays at 0.
+    No daedalus-v4l2-dkms bump needed.
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Thu, 21 May 2026 16:30:00 +0000
+
 daedalus-v4l2 (0.1.0+r33+g5d8b436-1) bookworm trixie; urgency=medium
 
   * Bump to 5d8b436 — reverts daedalus-v4l2 PRs #7 + #8 (the parking