Adds support for encoding to adpcm_ima_amv and muxing to AMV.
Things to note:
- AMV is a hard-coded (and broken) subset of AVI. It's not worth sullying the
existing AVI muxer with its filth.
- The muxer is extremely pedantic about its streams, this is to
not break certain software players.
- The sizes of certain tags are deliberately set to 0 as some players break
when they're set correctly. Ditto with some header fields.
- Players can be **very** sensitive to the frame order and sizes.
- Frames must be strictly interleaved as V-A, any V-V or A-A will
cause crashes.
- Variable audio frame sizes cause crashes.
- If audio is shorter than video, it's padded with silence.
- If video is shorter than audio, the most recent frame is repeated.
v4:
- Always use the coded sample count if its a sensible value
- Fix decoder odd sample check
v3: [2]
- Use ffio_fill()
v2: [1]
- Unref allocated audio frame
- Check return value of av_packet_ref()
- Remove unnecessary initialisations
- Add deinit() function
[1]: https://ffmpeg.org/pipermail/ffmpeg-devel/2020-November/271837.html
[2]: https://ffmpeg.org/pipermail/ffmpeg-devel/2020-November/271882.html
Zane van Iperen (5):
avcodec/adpcm_ima_amv: restrict to 1 channel
avcodec/adpcm_ima_amv: use coded sample count
avcodec/adpcm_ima_amv: document header format
avcodec: add adpcm_ima_amv encoder
avformat: add amv muxer
MAINTAINERS | 1 +
doc/general_contents.texi | 2 +-
libavcodec/adpcm.c | 34 ++-
libavcodec/adpcmenc.c | 58 ++++-
libavcodec/allcodecs.c | 1 +
libavcodec/utils.c | 3 +-
libavformat/Makefile | 1 +
libavformat/allformats.c | 1 +
libavformat/amvenc.c | 413 +++++++++++++++++++++++++++++++++++
tests/ref/fate/adpcm-ima-amv | 312 +++++++++++++-------------
10 files changed, 665 insertions(+), 161 deletions(-)
create mode 100644 libavformat/amvenc.c
--
2.28.0
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