static int mpegps_read_packet(AVFormatContext *s, AVPacket *pkt) { AVStream *st; int len, startcode, i, type, codec_id; int64_t pts, dts; redo: len = mpegps_read_pes_header(s, NULL, &startcode, &pts, &dts, 1); if (len < 0) return len; /* now find stream */ for(i=0;i<s->nb_streams;i++) { st = s->streams[i]; if (st->id == startcode) goto found; } if (startcode >= 0x1e0 && startcode <= 0x1ef) { type = CODEC_TYPE_VIDEO; codec_id = CODEC_ID_MPEG1VIDEO; } else if (startcode >= 0x1c0 && startcode <= 0x1df) { type = CODEC_TYPE_AUDIO; codec_id = CODEC_ID_MP2; } else if (startcode >= 0x80 && startcode <= 0x9f) { type = CODEC_TYPE_AUDIO; codec_id = CODEC_ID_AC3; } else if (startcode >= 0xa0 && startcode <= 0xbf) { type = CODEC_TYPE_AUDIO; codec_id = CODEC_ID_PCM_S16BE; } else { skip: /* skip packet */ url_fskip(&s->pb, len); goto redo; } /* no stream found: add a new stream */ st = av_new_stream(s, startcode); if (!st) goto skip; st->codec.codec_type = type; st->codec.codec_id = codec_id; if (codec_id != CODEC_ID_PCM_S16BE) st->need_parsing = 1; found: if (startcode >= 0xa0 && startcode <= 0xbf) { int b1, freq; static const int lpcm_freq_tab[4] = { 48000, 96000, 44100, 32000 }; /* for LPCM, we just skip the header and consider it is raw audio data */ if (len <= 3) goto skip; get_byte(&s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */ b1 = get_byte(&s->pb); /* quant (2), freq(2), reserved(1), channels(3) */ get_byte(&s->pb); /* dynamic range control (0x80 = off) */ len -= 3; freq = (b1 >> 4) & 3; st->codec.sample_rate = lpcm_freq_tab[freq]; st->codec.channels = 1 + (b1 & 7); st->codec.bit_rate = st->codec.channels * st->codec.sample_rate * 2; } av_new_packet(pkt, len); get_buffer(&s->pb, pkt->data, pkt->size); pkt->pts = pts; pkt->dts = dts; pkt->stream_index = st->index; #if 0 printf("%d: pts=%0.3f dts=%0.3f\n", pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0); #endif return 0; }