#!/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.  c454618 = PR #16 merge "picture,
# request_pool: transparent OUTPUT-pool resize on bitstream overrun
# (#15)" — follow-up root-cause fix to #13/#14.  On a mid-stream
# bitstream-budget overrun (typical cause: SPS-driven resolution
# upshift in an adaptive-bitrate stream), codec_store_buffer now
# snapshots the in-flight surface's accumulated bytes, releases its
# OUTPUT pool slot, calls request_pool_resize (STREAMOFF →
# REQBUFS(0) → S_FMT with 2×sizeimage hint, capped at 1 GiB, page-
# aligned → CREATE_BUFS → mmap → media_request_alloc → STREAMON),
# re-acquires a slot, re-mirrors the surface's source_{data,size,
# request_fd}, restores the bytes, and continues.  The frame
# survives instead of being dropped back to libavcodec for surface
# recreation.  CAPTURE side untouched (per-queue V4L2 streaming
# independence).
#
# Prior pin (2860d75) = PR #14 merge — codec_store_buffer bounds-
# check floor (#13).
UPSTREAM_COMMIT=c454618ae11addce2e17b560f4deeacbed067d98
PKGVER=1.0.0+r390+gc454618
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 "$work"
curl --connect-timeout 10 --max-time 600 --retry 3 --retry-delay 5 -sSLfo libva-fourier.tar.gz \
    "https://git.reauktion.de/marfrit/libva-v4l2-request-fourier/archive/${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

# ---------------------------------------------------------------------------
# ABI sanity check: the produced .so MUST export __vaDriverInit_1_<MINOR>
# matching the install target's libva runtime.  Build is expected to run on
# a Debian trixie runner where <va/va.h>'s VA_MINOR is 22 — see
# .gitea/workflows/build.yml (runs-on: actrunner-debian-aarch64-bohr).  If a future
# runner change lands the build on a host with a different libva-dev
# version, the produced symbol won't bind on the install target and ffmpeg/
# vainfo/firefox-vaapi will all fail with "has no function
# __vaDriverInit_1_0".  Fail loud at build time instead of shipping a
# silently-broken .deb (which is what happened in -1).
# ---------------------------------------------------------------------------
SO=$(find build -name 'v4l2_request_drv_video.so' | head -1)
if ! nm -D --defined-only "$SO" | grep -q '__vaDriverInit_1_22'; then
    echo "FATAL: built driver does not export __vaDriverInit_1_22."
    echo "    Build host's <va/va.h> VA_MINOR_VERSION is likely != 22."
    echo "    Expected runner: actrunner-debian-aarch64-bohr (trixie, libva 2.22)."
    echo "    Symbol exports found:"
    nm -D --defined-only "$SO" | grep -i vadriverinit || echo "    (none)"
    exit 1
fi
echo "ABI check: $SO exports __vaDriverInit_1_22 (matches trixie libva 2.22)"

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"