[FFmpeg-devel] [PATCH v6 0/9] Properly decode ogg metadata in ogg/{vorbis, flac, opus} chained bitstreams

[Romain Beauxis]

This is a series of patches to allow proper decoding of ogg metadata in chained
`ogg/vorbis, `ogg/flac` and `ogg/opus` streams.

## Changes since last version:
* Metadata update is now using a factored out function from the vorbis
  decoder which includes update the underlying AVStream metadata and
  setting AVSTREAM_EVENT_FLAG_METADATA_UPDATED on it.
* New vorbis comment metadata erase existing ones instead of appending
* Test utility is updated to include the stream's metadata
* A test for chained ogg/vorbis metadata is added.

Last version and discussion: https://ffmpeg.org/pipermail/ffmpeg-devel/2025-February/339887.html

Romain Beauxis (9):
  libavcodec/decode.c: intercept `AV_PKT_DATA_METADATA_UPDATE` packet
    extra data, attach them to the next decoded frame.
  tests: Add stream dump test API util.
  libavformat/oggparsevorbis.c: Don't append new metadata.
  tests: Add chained ogg/vorbis stream dump test.
  libavformat/oggdec.h, libavformat/oggparsevorbis.c: Factor out vorbis
    metadata update mechanism.
  libavformat/oggparseflac.c: Parse ogg/flac comments in new ogg
    packets, add them to ogg stream new_metadata.
  tests: Add chained ogg/flac stream dump test.
  libavformat/oggparseopus.c: Parse comments from secondary chained
    streams header packet.
  tests: Add chained ogg/opus stream dump test.

 libavcodec/decode.c                   |  20 +++
 libavformat/oggdec.h                  |  14 +++
 libavformat/oggparseflac.c            |  21 ++++
 libavformat/oggparseopus.c            |  13 +-
 libavformat/oggparsevorbis.c          |  29 +++--
 tests/Makefile                        |   4 +
 tests/api/Makefile                    |   2 +-
 tests/api/api-dump-stream-meta-test.c | 175 ++++++++++++++++++++++++++
 tests/fate/ogg-flac.mak               |  11 ++
 tests/fate/ogg-opus.mak               |  11 ++
 tests/fate/ogg-vorbis.mak             |  11 ++
 11 files changed, 298 insertions(+), 13 deletions(-)
 create mode 100644 tests/api/api-dump-stream-meta-test.c
 create mode 100644 tests/fate/ogg-flac.mak
 create mode 100644 tests/fate/ogg-opus.mak
 create mode 100644 tests/fate/ogg-vorbis.mak

-- 
2.39.5 (Apple Git-154)