int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { int ret; AVStream *st; ff_read_frame_flush(s); if(flags & AVSEEK_FLAG_BYTE) return av_seek_frame_byte(s, stream_index, timestamp, flags); if(stream_index < 0){ stream_index= av_find_default_stream_index(s); if(stream_index < 0) return -1; st= s->streams[stream_index]; /* timestamp for default must be expressed in AV_TIME_BASE units */ timestamp = av_rescale(timestamp, st->time_base.den, AV_TIME_BASE * (int64_t)st->time_base.num); } /* first, we try the format specific seek */ if (s->iformat->read_seek) ret = s->iformat->read_seek(s, stream_index, timestamp, flags); else ret = -1; if (ret >= 0) { return 0; } if(s->iformat->read_timestamp) return av_seek_frame_binary(s, stream_index, timestamp, flags); else return av_seek_frame_generic(s, stream_index, timestamp, flags); }