RTP/JPEG specific private data.
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
int ff_parse_fmtp(AVStream *stream, PayloadContext *data, const char *p, int(*parse_fmtp)(AVStream *stream, PayloadContext *data, char *attr, char *value))