[FFmpeg-devel] [PATCH] Mobotix .mxg demixer and MxPEG decoder basic implementation

[Reimar Döffinger]

On Wed, Aug 11, 2010 at 09:22:48PM +0400, Anatoly Nenashev wrote:
> >> @@ -1026,6 +1044,12 @@
> >>       if(8*len + get_bits_count(&s->gb)>  s->gb.size_in_bits)
> >>           return -1;
> >>
> >> +    /* skip MXPEG audio data*/
> >> +    if ((s->avctx->codec_id == CODEC_ID_MXPEG)&&  (s->start_code == APP13)) {
> >> +        skip_bits(&s->gb, (len-2)<<  3);
> >> +        return 0;
> >> +    }
> >>      
> > how does the audio data reach the video decoder?
> > this just looks like the demuxer is wrongly implemented
> >
> > [...]
> >
> >    
> 
> On the other hand APP13 is valid marker for JPEG format. So, there no 
> need to extract this data from video stream.
> Also rejecting audio data from video stream will reduce the performance.

At worst, by implementing a custom function that frees the packets
there should not be any reduction in performance.
Even without it, it's at most the cost of memcpying the whole stream.