Martin Storsjö c9b5e145b7 avformat: Add av_mime_codec_str public API ...

Add a public API for producing RFC 4281/6381 codecs trings for
MIME types.

This can be required for providing alternative video files to
a web browser, letting the browser pick the best file it supports.
Such strings also allow querying a browser whether it supports
a certain codec combination.

Finally, if implementing a DASH/HLS segmenter outside of libavformat,
one also has to generate such strings.

Generating such strings for H264/AAC is very simple, but for
more modern codecs, it can require a lot of nontrivial codec
specific parsing of extradata.

As libavformat already implements this, expose it for users as well.

The old, internal function ff_make_codec_str is kept and used by
the HLS and DASH muxers; the old function takes a logging context
which can be used for logging auxillary info about how the string
generation worked out.

2025-12-12 18:40:00 +02:00

9.5 KiB

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