Commit Graph

14 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
Diego Biurrun
9adbc3f3a1 bmv: Remove unused variable 2013-10-06 19:36:53 +02:00
Michael Niedermayer
63139f62f3 avformat/bmv: remove unused variable
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-09-19 22:04:34 +02:00
Michael Niedermayer
20dfab33f5 Merge commit '5626f994f273af80fb100d4743b963304de9e05c'
* commit '5626f994f273af80fb100d4743b963304de9e05c':
  avformat: Use av_reallocp() where suitable

Conflicts:
	libavformat/avidec.c
	libavformat/avienc.c
	libavformat/aviobuf.c
	libavformat/oggparsevorbis.c
	libavformat/utils.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2013-09-19 11:01:26 +02:00
Alexandra Khirnova
5626f994f2 avformat: Use av_reallocp() where suitable
Signed-off-by: Diego Biurrun <diego@biurrun.de>
2013-09-18 18:28:38 +02:00
Thilo Borgmann
d814a839ac Reinstate proper FFmpeg license for all files. 2013-08-30 15:47:38 +00:00
Justin Ruggles
e8088d6e4b bmv: set channel layout 2012-11-12 10:33:18 -05:00
Anton Khirnov
716d413c13 Replace PIX_FMT_* -> AV_PIX_FMT_*, PixelFormat -> AVPixelFormat 2012-10-08 07:13:26 +02:00
Anton Khirnov
36ef5369ee Replace all CODEC_ID_* with AV_CODEC_ID_* 2012-08-07 16:00:24 +02:00
Martin Storsjö
20234a4bd7 cosmetics: Align muxer/demuxer declarations
Also add missing trailing commas, break long codec_tag lines and
add spaces in codec_tag declarations.

Signed-off-by: Martin Storsjö <martin@martin.st>
2012-04-06 19:19:59 +03:00
Anton Khirnov
6e9651d106 lavf: remove AVFormatParameters from AVFormatContext.read_header signature 2012-01-27 10:51:57 +01:00
Anton Khirnov
c3f9ebf743 lavf: make av_set_pts_info private.
It's supposed to be called only from (de)muxers.
2011-11-30 20:34:45 +01:00
Kostya Shishkov
f545e00677 BMV demuxer and decoder
Signed-off-by: Martin Storsjö <martin@martin.st>
2011-11-08 00:36:45 +02:00