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 <jianhui.j.dai@intel.com>
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/configure b/configure
index 055d558c5a..d6e4a1e7df 100755
--- a/configure
+++ b/configure
@@ -2471,6 +2471,7 @@ CONFIG_EXTRA="
     cbs_h266
     cbs_jpeg
     cbs_mpeg2
+    cbs_vp8
     cbs_vp9
     deflate_wrapper
     dirac_parse
@@ -2756,6 +2757,7 @@ cbs_h265_select="cbs"
 cbs_h266_select="cbs"
 cbs_jpeg_select="cbs"
 cbs_mpeg2_select="cbs"
+cbs_vp8_select="cbs"
 cbs_vp9_select="cbs"
 deflate_wrapper_deps="zlib"
 dirac_parse_select="golomb"
@@ -3340,7 +3342,7 @@ h264_redundant_pps_bsf_select="cbs_h264"
 hevc_metadata_bsf_select="cbs_h265"
 mjpeg2jpeg_bsf_select="jpegtables"
 mpeg2_metadata_bsf_select="cbs_mpeg2"
-trace_headers_bsf_select="cbs"
+trace_headers_bsf_select="cbs cbs_vp8"
 vp9_metadata_bsf_select="cbs_vp9"
 vvc_metadata_bsf_select="cbs_h266"