Commit Graph

7 Commits

Author SHA1 Message Date
Derek Buitenhuis
6f69f7a8bf Merge commit '9200514ad8717c63f82101dc394f4378854325bf'
* commit '9200514ad8717c63f82101dc394f4378854325bf':
  lavf: replace AVStream.codec with AVStream.codecpar

This has been a HUGE effort from:
    - Derek Buitenhuis <derek.buitenhuis@gmail.com>
    - Hendrik Leppkes <h.leppkes@gmail.com>
    - wm4 <nfxjfg@googlemail.com>
    - Clément Bœsch <clement@stupeflix.com>
    - James Almer <jamrial@gmail.com>
    - Michael Niedermayer <michael@niedermayer.cc>
    - Rostislav Pehlivanov <atomnuker@gmail.com>

Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
2016-04-10 20:59:55 +01:00
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
Michael Niedermayer
5a1cd796e2 Merge commit '430a8168594b3cb29f44141d4da88f2c642de06f'
* commit '430a8168594b3cb29f44141d4da88f2c642de06f':
  oggdec: add support for VP8 demuxing

Conflicts:
	Changelog
	libavformat/oggparsevp8.c
	libavformat/version.h

See: d890db5f53
Merged-by: Michael Niedermayer <michaelni@gmx.at>
2014-12-19 04:36:45 +01:00
James Almer
430a816859 oggdec: add support for VP8 demuxing
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
2014-12-18 23:27:07 +01:00
James Almer
dffbac0956 lavf/oggparsevp8: use ff_vorbis_stream_comment()
commit db68ef89 did not update the vp8 parser

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2014-08-14 05:47:06 +02:00
Michael Niedermayer
579e2b2874 Merge commit '23f741f79327e31be7b2a75ebb2e02111e06e52f'
* commit '23f741f79327e31be7b2a75ebb2e02111e06e52f':
  matroskadec: parse the channel layout mask for FLAC

Conflicts:
	libavformat/oggparsevorbis.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2014-05-28 13:02:19 +02:00
James Almer
d890db5f53 oggdec: add support for VP8 demuxing
Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-12-30 04:05:27 +01:00