Handle AVID MJPEG streams directly in the MJPEG decoder

Multimedia / FFmpeg - Anton Khirnov [khirnov.net] - 25 February 2021 10:46 UTC

AVID streams - currently handled by the AVRN decoder - can be (depending on extradata contents) either MJPEG or raw video. To decode the MJPEG
variant, the AVRN decoder currently instantiates a MJPEG decoder internally and forwards decoded frames to the caller (possibly after cropping them).

This is suboptimal, because the AVRN decoder does not forward all the features of the internal MJPEG decoder, such as direct rendering. Handling such forwarding in a full and generic manner would be quite hard, so it is simpler to just handle those streams in the MJPEG decoder directly.

The AVRN decoder, which now handles only the raw streams, can now be marked as supporting direct rendering.

This also removes the last remaining internal use of the obsolete decoding API.

9e4225cf7f Handle AVID MJPEG streams directly in the MJPEG decoder.
configure | 1 -
libavcodec/avrndec.c | 71 +------------------------------------------------
libavcodec/mjpegdec.c | 11 ++++++++
libavcodec/version.h | 2 +-
libavformat/avidec.c | 6 +++++
libavformat/isom_tags.c | 4 +--
tests/fate/video.mak | 2 +-
7 files changed, 22 insertions(+), 75 deletions(-)

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