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    • 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
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    • Diego Biurrun's avatar
      configure: Do not unconditionally add -D_POSIX_C_SOURCE to CPPFLAGS. · 046f081b
      Diego Biurrun authored
      Adding _POSIX_C_SOURCE to CPPFLAGS globally produces all sorts of problems
      since it causes certain system functions to be hidden on some (BSD) systems.
      The solution is to only add the flag on systems that really require it, i.e.
      glibc-based ones.
      
      This change makes BSD systems compile out-of-the-box without the need for
      adding specific flags manually.  It also allows dropping a number of flags
      set manually on a file-per-file basis, but were only present to work around
      breakage introduced by the presence of _POSIX_C_SOURCE.
      
      Also add _XOPEN_SOURCE to CPPFLAGS for glibc systems.  We use XSI extensions
      in several places already, so it is preferable to define it globally instead
      of littering source files with individual #defines only needed for glibc.
      046f081b