avcodec/cbs_vp8: Add support for VP8 codec bitstream

This commit adds support for VP8 bitstream read methods to the cbs
codec. This enables the trace_headers bitstream filter to support VP8,
in addition to AV1, H.264, H.265, and VP9. This can be useful for
debugging VP8 stream issues.

The CBS VP8 implements a simple VP8 boolean decoder using GetBitContext
to read the bitstream.

Only the read methods `read_unit` and `split_fragment` are implemented.
The write methods `write_unit` and `assemble_fragment` return the error
code AVERROR_PATCHWELCOME. This is because CBS VP8 write is unlikely to
be used by any applications at the moment. The write methods can be
added later if there is a real need for them.

TESTS: ffmpeg -i fate-suite/vp8/frame_size_change.webm -vcodec copy
-bsf:v trace_headers -f null -

Signed-off-by: Jianhui Dai <[email protected]>
Signed-off-by: Ronald S. Bultje <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/libavcodec/cbs_internal.h b/libavcodec/cbs_internal.h
index 07220f1f3e..d982262bd9 100644
--- a/libavcodec/cbs_internal.h
+++ b/libavcodec/cbs_internal.h
@@ -341,6 +341,7 @@ extern const CodedBitstreamType ff_cbs_type_h265;
 extern const CodedBitstreamType ff_cbs_type_h266;
 extern const CodedBitstreamType ff_cbs_type_jpeg;
 extern const CodedBitstreamType ff_cbs_type_mpeg2;
+extern const CodedBitstreamType ff_cbs_type_vp8;
 extern const CodedBitstreamType ff_cbs_type_vp9;