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ffmpeg-v4l2-request-fourier: preserve sl->mb for inspection callback (0017)

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Companion to 0016 (PR #106).  Adds a coefficient side buffer in
H264Context, populated at the start of ff_h264_hl_decode_mb with a
single memcpy from sl->mb BEFORE IDCT-add zeros it.  The existing
post-pixel-work callback (still in 0016) can now read:
  - h->mb_inspect_coeffs  = pre-IDCT coefficients (this patch)
  - h->cur_pic.f->data    = post-pixel-work pre-deblock reconstruction

and derive P = pixels − IDCT(C) for daedalus-decoder's frame-major
dispatch in PR-A3+.

Memcpy gated on (h->mb_inspect_cb != NULL).  Zero cost when no
consumer is registered.  Side buffer = 16 * 48 int16 = 1536 bytes
(matches the 8-bit half of sl->mb's int16_t[16 * 48 * 2] declared
size; high-bit-depth uses the upper half — not preserved here since
the daedalus-decoder consumer is 8-bit-only).

Single-threaded decode assumed at the consumer side
(avctx->thread_count = 1).  Multi-slice / multi-threaded streams
would race on the single side buffer — explicit limitation of the
inspection mechanism, future extension would put per-slice buffers
in H264SliceContext.

Verified: patches 0016 + 0017 apply cleanly and build in sequence
against the Kwiboo v4l2-request-n8.1 fork at the pinned commit
b57fbbe5.  ff_h264_set_mb_inspect_cb symbol exported as before.

Wired into arch PKGBUILD + debian build-deb.sh patch sequence.
pkgrel bumped 13 → 14.

Refs reauktion/daedalus-decoder!14 (PR-A2 callback wiring complete,
PR-A3 coefficient extraction is the next consumer).
This commit is contained in:
Claude (noether)
2026-05-26 09:46:10 +02:00
parent 59901bceca
commit ea99dc8e27
4 changed files with 183 additions and 4 deletions
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arch/ffmpeg-v4l2-request-fourier/PKGBUILD
+5 -3
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@@ -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=13 # pkgrel=13 — per-MB inspection callback (0016) for daedalus-decoder CLI test harness; observation-only, no behaviour change to existing decode path
pkgrel=14 # pkgrel=14 — per-MB coefficient side buffer (0017) extending 0016 for daedalus-decoder CLI IDCT validation; observation-only, no behaviour change to existing decode path
epoch=2
# daedalus-fourier pin. 209a421 = PR #2 merge (Phase 8c — public API
@@ -103,8 +103,9 @@ source=("git+https://github.com/Kwiboo/FFmpeg.git#commit=${_commit}"
'0013-h264-deblock-chroma-intra-daedalus-fourier.patch'
'0014-h264-ctx-qpu-capable.patch'
'0015-h264-ctx-revert-to-no-qpu.patch'
'0016-h264-mb-inspect-callback.patch')
sha256sums=('SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP')
'0016-h264-mb-inspect-callback.patch'
'0017-h264-mb-coeffs-side-buffer.patch')
sha256sums=('SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP')
pkgver() {
cd "${_srcname}"
@@ -131,6 +132,7 @@ prepare() {
patch -Np1 -i "${srcdir}/0014-h264-ctx-qpu-capable.patch"
patch -Np1 -i "${srcdir}/0015-h264-ctx-revert-to-no-qpu.patch"
patch -Np1 -i "${srcdir}/0016-h264-mb-inspect-callback.patch"
patch -Np1 -i "${srcdir}/0017-h264-mb-coeffs-side-buffer.patch"
}
build() {