Commit Graph

6 Commits

Author SHA1 Message Date
Anton Khirnov 9200514ad8 lavf: replace AVStream.codec with AVStream.codecpar
Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.

In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.

There are multiple important problems with this approach:
    - the fields in AVCodecContext are in general one of
        * stream parameters
        * codec options
        * codec state
      However, it's not clear which ones are which. It is consequently
      unclear which fields are a demuxer allowed to set or a muxer allowed to
      read. This leads to erratic behaviour depending on whether decoding or
      encoding is being performed or not (and whether it uses the AVStream
      embedded codec context).
    - various synchronization issues arising from the fact that the same
      context is used by several different APIs (muxers/demuxers,
      parsers, bitstream filters and encoders/decoders) simultaneously, with
      there being no clear rules for who can modify what and the different
      processes being typically delayed with respect to each other.
    - avformat_find_stream_info() making it necessary to support opening
      and closing a single codec context multiple times, thus
      complicating the semantics of freeing various allocated objects in the
      codec context.

Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
2016-02-23 17:01:58 +01:00
Diego Biurrun 8d26c193fb avdevice: Apply a more consistent file naming scheme 2015-04-09 16:40:12 +02:00
Diego Biurrun c201069fac avdevice: Add missing header for NULL_IF_CONFIG_SMALL
Also reshuffle headers into canonical order where appropriate.
2015-04-09 16:40:12 +02:00
Anton Khirnov 36ef5369ee Replace all CODEC_ID_* with AV_CODEC_ID_* 2012-08-07 16:00:24 +02:00
Reimar Döffinger c673c90515 oss,sndio: simplify by using FFMIN.
Signed-off-by: Anton Khirnov <anton@khirnov.net>
2011-06-09 22:53:17 +02:00
Brad 15d59d2cea sndio support for playback and record
Signed-off-by: Anton Khirnov <anton@khirnov.net>
2011-03-27 10:46:45 +02:00