int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, AVCodec **decoder_ret, int flags) { int i, nb_streams = ic->nb_streams, stream_number = 0; int ret = AVERROR_STREAM_NOT_FOUND, best_count = -1; unsigned *program = NULL; AVCodec *decoder = NULL, *best_decoder = NULL; if (related_stream >= 0 && wanted_stream_nb < 0) { AVProgram *p = find_program_from_stream(ic, related_stream); if (p) { program = p->stream_index; nb_streams = p->nb_stream_indexes; } } for (i = 0; i < nb_streams; i++) { AVStream *st = ic->streams[program ? program[i] : i]; AVCodecContext *avctx = st->codec; if (avctx->codec_type != type) continue; if (wanted_stream_nb >= 0 && stream_number++ != wanted_stream_nb) continue; if (st->disposition & (AV_DISPOSITION_HEARING_IMPAIRED|AV_DISPOSITION_VISUAL_IMPAIRED)) continue; if (decoder_ret) { decoder = avcodec_find_decoder(st->codec->codec_id); if (!decoder) { if (ret < 0) ret = AVERROR_DECODER_NOT_FOUND; continue; } } if (best_count >= st->codec_info_nb_frames) continue; best_count = st->codec_info_nb_frames; ret = program ? program[i] : i; best_decoder = decoder; if (program && i == nb_streams - 1 && ret < 0) { program = NULL; nb_streams = ic->nb_streams; i = 0; /* no related stream found, try again with everything */ } } if (decoder_ret) *decoder_ret = best_decoder; return ret; }