1. 23 Feb, 2016 1 commit
    • Anton Khirnov's avatar
      lavf: replace AVStream.codec with AVStream.codecpar · 9200514a
      Anton Khirnov authored
      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.
      9200514a
  2. 10 Mar, 2015 2 commits
  3. 24 Feb, 2015 1 commit
  4. 19 Dec, 2014 1 commit
  5. 18 Dec, 2014 1 commit
    • Martin Storsjö's avatar
      libavformat: Add a muxer wrapping mpegts encoding into RTP · 8a70ef94
      Martin Storsjö authored
      Since this structurally is quite different from normal RTP
      (multiple streams are muxed into one single mpegts stream,
      which is packetized into one single RTP session), it is kept
      as a separate muxer.
      
      Since this structurally also behaves differently than normal
      RTP, all of the other muxers that do chained RTP muxing
      (rtsp, sap, mp4) would need to be updated similarly to handle
      this - in particular, creating one single rtp_mpegts muxer
      for the whole presentation instead of one rtp muxer per stream.
      Signed-off-by: 's avatarMartin Storsjö <martin@martin.st>
      8a70ef94