Merge pull request 'ffmpeg-v4l2-request-fourier: export ff_h264_set_mb_inspect_cb (0016 amend, PKGREL 15)' (#108) from claude-noether/marfrit-packages:noether/h264-mb-inspect-export-symbol into main

Reviewed-on: #108

arch/ffmpeg-v4l2-request-fourier/0016-h264-mb-inspect-callback.patch

@@ -35,13 +35,20 @@ to fall through.
 
 Used by:
   - daedalus-decoder/tools/daedalus_decode_h264 (PR-A1b)
-  - future daedalus-v4l2 daemon refactor
+  - daedalus-v4l2 daemon shadow-mode path (PR-Q3a.1+)
+
+The CLI static-links libavcodec.a so symbol visibility doesn't matter
+there.  The daemon dlopens libavcodec.so.62 and resolves the callback
+via dlsym, so the symbol MUST be exported — added to libavcodec.v
+explicitly (FFmpeg's default version script hides every `ff_*` symbol
+as LOCAL behind a glob).
 
 Refs reauktion/daedalus-decoder!12 (Stage 2 PR-b complete).
 ---
  libavcodec/h264_mb.c    | 20 ++++++++++++++++++++
  libavcodec/h264dec.h    | 26 ++++++++++++++++++++++++++
- 2 files changed, 46 insertions(+)
+ libavcodec/libavcodec.v |  1 +
+ 3 files changed, 47 insertions(+)
 
 --- a/libavcodec/h264dec.h
 +++ b/libavcodec/h264dec.h
@@ -113,3 +120,13 @@ Refs reauktion/daedalus-decoder!12 (Stage 2 PR-b complete).
 +    h->mb_inspect_cb     = cb;
 +    h->mb_inspect_opaque = opaque;
  }
+--- a/libavcodec/libavcodec.v
++++ b/libavcodec/libavcodec.v
+@@ -3,6 +3,7 @@
+         av_*;
+         avcodec_*;
+         avpriv_*;
++        ff_h264_set_mb_inspect_cb;
+         avsubtitle_free;
+     local:
+         *;

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=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
+pkgrel=15  # pkgrel=15 — export ff_h264_set_mb_inspect_cb via libavcodec.v so dlsym consumers (daedalus-v4l2 daemon shadow_decoder, PR-Q3a.1) can resolve the symbol; static-link CLI was unaffected. No behaviour change to existing decode path. (2026-05-26)
 epoch=2
 
 # daedalus-fourier pin.  209a421 = PR #2 merge (Phase 8c — public API

debian/ffmpeg-v4l2-request-fourier/0016-h264-mb-inspect-callback.patch

@@ -35,13 +35,20 @@ to fall through.
 
 Used by:
   - daedalus-decoder/tools/daedalus_decode_h264 (PR-A1b)
-  - future daedalus-v4l2 daemon refactor
+  - daedalus-v4l2 daemon shadow-mode path (PR-Q3a.1+)
+
+The CLI static-links libavcodec.a so symbol visibility doesn't matter
+there.  The daemon dlopens libavcodec.so.62 and resolves the callback
+via dlsym, so the symbol MUST be exported — added to libavcodec.v
+explicitly (FFmpeg's default version script hides every `ff_*` symbol
+as LOCAL behind a glob).
 
 Refs reauktion/daedalus-decoder!12 (Stage 2 PR-b complete).
 ---
  libavcodec/h264_mb.c    | 20 ++++++++++++++++++++
  libavcodec/h264dec.h    | 26 ++++++++++++++++++++++++++
- 2 files changed, 46 insertions(+)
+ libavcodec/libavcodec.v |  1 +
+ 3 files changed, 47 insertions(+)
 
 --- a/libavcodec/h264dec.h
 +++ b/libavcodec/h264dec.h
@@ -113,3 +120,13 @@ Refs reauktion/daedalus-decoder!12 (Stage 2 PR-b complete).
 +    h->mb_inspect_cb     = cb;
 +    h->mb_inspect_opaque = opaque;
  }
+--- a/libavcodec/libavcodec.v
++++ b/libavcodec/libavcodec.v
+@@ -3,6 +3,7 @@
+         av_*;
+         avcodec_*;
+         avpriv_*;
++        ff_h264_set_mb_inspect_cb;
+         avsubtitle_free;
+     local:
+         *;

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

@@ -33,12 +33,10 @@ 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=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
+PKGREL=15  # pkgrel=15 — export ff_h264_set_mb_inspect_cb via libavcodec.v so
-           # (cycle 9 of the daedalus-v4l2#11 step 2 substitution arc; closes
+           # dlsym consumers (daedalus-v4l2 daemon shadow_decoder, PR-Q3a.1)
-           # the libavcodec.so substitution sequence 6 IDCT4 / 7 IDCT8 /
+           # can resolve the symbol; static-link CLI was unaffected.  No
-           # 8 luma-v deblock / 9 qpel mc20).  Pulls daedalus-fourier PR #2
+           # behaviour change to existing decode path.  (2026-05-26)
-           # which extends the public API with
-           # daedalus_recipe_dispatch_h264_qpel_mc20.  (2026-05-23)
 
 # daedalus-fourier pin.  209a421 = daedalus-fourier PR #2 merge — public
 # API now exposes daedalus_recipe_dispatch_h264_qpel_mc20 +

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

@@ -1,3 +1,21 @@
+ffmpeg-v4l2-request-fourier (2:8.1+rfourier+gb57fbbe-15) bookworm trixie; urgency=medium
+
+  * Amend 0016-h264-mb-inspect-callback.patch to also add
+    ff_h264_set_mb_inspect_cb to libavcodec/libavcodec.v so the
+    symbol is exported (GLOBAL) on the shipped libavcodec.so.62.
+    Without this, FFmpeg's default version script hides every ff_*
+    symbol behind a glob → LOCAL → dlsym() returns NULL.  The CLI
+    consumer (daedalus_decode_h264) was unaffected because it
+    static-links libavcodec.a; the daedalus-v4l2 daemon (PR-Q3a.1
+    shadow_decoder path) dlopens libavcodec.so.62 and needs the
+    symbol resolvable at runtime.
+  * No behaviour change to existing decode path.  Callback is still
+    opt-in via the function pointer (NULL default), so paying the
+    one-load-one-branch cost only when a consumer has explicitly
+    installed an inspection callback.
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Tue, 26 May 2026 15:00:00 +0200
+
 ffmpeg-v4l2-request-fourier (2:8.1+rfourier+gb57fbbe-10) bookworm trixie; urgency=medium
 
   * Add 0007-h264-qpel-mc20-daedalus-fourier.patch —