[FFmpeg-devel] [PATCH 5/8] avformat/rtpdec_rfc4175: add support for exactframerate

[lance.lmwang at gmail.com]

On Mon, Oct 11, 2021 at 05:00:29PM +0200, Andreas Rheinhardt wrote:
> lance.lmwang at gmail.com:
> > From: Limin Wang <lance.lmwang at gmail.com>
> > 
> > Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> > ---
> >  libavformat/rtpdec_rfc4175.c | 14 ++++++++++++++
> >  1 file changed, 14 insertions(+)
> > 
> > diff --git a/libavformat/rtpdec_rfc4175.c b/libavformat/rtpdec_rfc4175.c
> > index 46d30ed..367567d 100644
> > --- a/libavformat/rtpdec_rfc4175.c
> > +++ b/libavformat/rtpdec_rfc4175.c
> > @@ -25,9 +25,11 @@
> >  #include "rtpdec_formats.h"
> >  #include "libavutil/avstring.h"
> >  #include "libavutil/pixdesc.h"
> > +#include "libavutil/parseutils.h"
> >  
> >  struct PayloadContext {
> >      char *sampling;
> > +    char *framerate;
> >      int depth;
> >      int width;
> >      int height;
> > @@ -45,6 +47,7 @@ static int rfc4175_parse_format(AVStream *stream, PayloadContext *data)
> >      enum AVPixelFormat pixfmt;
> >      int tag;
> >      const AVPixFmtDescriptor *desc;
> > +    AVRational framerate;
> >  
> >      if (!strncmp(data->sampling, "YCbCr-4:2:2", 11)) {
> >          tag = MKTAG('U', 'Y', 'V', 'Y');
> > @@ -69,6 +72,14 @@ static int rfc4175_parse_format(AVStream *stream, PayloadContext *data)
> >      stream->codecpar->bits_per_coded_sample = av_get_bits_per_pixel(desc);
> >      data->frame_size = data->width * data->height * data->pgroup / data->xinc;
> >  
> > +    if (data->framerate) {
> > +        if (av_parse_video_rate(&framerate, data->framerate) < 0)
> > +            return AVERROR(EINVAL);
> > +        stream->avg_frame_rate = framerate;
> > +        if (framerate.den)
> > +            stream->codecpar->bit_rate = data->frame_size * av_q2d(framerate) * 8;
> > +    }
> > +
> >      return 0;
> >  }
> >  
> > @@ -84,6 +95,8 @@ static int rfc4175_parse_fmtp(AVFormatContext *s, AVStream *stream,
> >          data->sampling = av_strdup(value);
> >      else if (!strncmp(attr, "depth", 5))
> >          data->depth = atoi(value);
> > +    else if (!strncmp(attr, "exactframerate", 14))
> > +        data->framerate = av_strdup(value);
> >  
> >      return 0;
> >  }
> > @@ -112,6 +125,7 @@ static int rfc4175_parse_sdp_line(AVFormatContext *s, int st_index,
> >  
> >          ret = rfc4175_parse_format(stream, data);
> >          av_freep(&data->sampling);
> > +        av_freep(&data->framerate);
> >  
> >          return ret;
> >      }
> > 
> 
> Why the (unchecked!) allocation of a temporary string if you only want
> the number anyway?

I'm just following the same style for sampling, but I can change to parse the frame rate when
parsing fmtp string to save the temporary string allocation if you prefer to. 

> 
> - Andreas
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-- 
Thanks,
Limin Wang