#!/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"