[MPlayer-dev-eng] [RFC][PATCH] audio and video framers

Nico Sabbi nicola_sabbi at fastwebnet.it
Sat Feb 24 23:32:52 CET 2007

This patch adds to mplayer a framer layer and 4 implementations (as 
usual for mpeg* formats):
- one for mpeg1/2 video
- one for each of mpeg audio, aac, ac3 (for dts it's equally trivial but 
I didn't have time).
- in theory there's support for codecs that use extradata (e.g. vorbis 
would be parsable)

Demuxers need only set ds->needs_parsing=1; if possible demux_open() 
will initialize the
appropriate framers/parsers and from that point onward:
- ds_add_packet() will do something like
    if(ds->parser) {
        demux_packet_t *dp2;
        mp_parser_fill_buffer(ds->parser, dp);
        while(dp2 = mp_parser_fetch_packet(ds->parser)) 
real_ds_add_packet(ds, dp2);
    } else real_ds_add_packet(ds, dp);

-  ds_free_packs() will reset the parser's buffers, so seeking will be safe.

The job of the framer is to output demux_packets containing exactly 1 
frame with the correct pts;
the pts will be either:
- the one provided by the mux when available
- an interpolated value based on the properties read from the elementary 

Framers can be used both in the path between demuxers and decoders and 
in the path
between [m]encoder and muxers (mpeg or lavf, that need correct pts for 
every frame,
not yet implemented).

In order to activate the framer you have to add -framer to your command 
line, possibly with -correct-pts
(now fully supported).

Audio and video switching are not yet supported.

I'm not completely sure there aren't bugs.
I'd like to hear opinions and test reports.


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