static int mpegts_write_header(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; MpegTSWriteStream *ts_st; MpegTSService *service; AVStream *st, *pcr_st = NULL; AVDictionaryEntry *title, *provider; int i, j; const char *service_name; const char *provider_name; int *pids; int ret; if (s->max_delay < 0) /* Not set by the caller */ s->max_delay = 0; // round up to a whole number of TS packets ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14; ts->tsid = ts->transport_stream_id; ts->onid = ts->original_network_id; /* allocate a single DVB service */ title = av_dict_get(s->metadata, "service_name", NULL, 0); if (!title) title = av_dict_get(s->metadata, "title", NULL, 0); service_name = title ? title->value : DEFAULT_SERVICE_NAME; provider = av_dict_get(s->metadata, "service_provider", NULL, 0); provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME; service = mpegts_add_service(ts, ts->service_id, provider_name, service_name); if (!service) return AVERROR(ENOMEM); service->pmt.write_packet = section_write_packet; service->pmt.opaque = s; service->pmt.cc = 15; ts->pat.pid = PAT_PID; /* Initialize at 15 so that it wraps and is equal to 0 for the * first packet we write. */ ts->pat.cc = 15; ts->pat.write_packet = section_write_packet; ts->pat.opaque = s; ts->sdt.pid = SDT_PID; ts->sdt.cc = 15; ts->sdt.write_packet = section_write_packet; ts->sdt.opaque = s; pids = av_malloc_array(s->nb_streams, sizeof(*pids)); if (!pids) { ret = AVERROR(ENOMEM); goto fail; } /* assign pids to each stream */ for (i = 0; i < s->nb_streams; i++) { st = s->streams[i]; ts_st = av_mallocz(sizeof(MpegTSWriteStream)); if (!ts_st) { ret = AVERROR(ENOMEM); goto fail; } st->priv_data = ts_st; ts_st->user_tb = st->time_base; avpriv_set_pts_info(st, 33, 1, 90000); ts_st->payload = av_mallocz(ts->pes_payload_size); if (!ts_st->payload) { ret = AVERROR(ENOMEM); goto fail; } ts_st->service = service; /* MPEG pid values < 16 are reserved. Applications which set st->id in * this range are assigned a calculated pid. */ if (st->id < 16) { ts_st->pid = ts->start_pid + i; } else if (st->id < 0x1FFF) { ts_st->pid = st->id; } else { av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id); ret = AVERROR(EINVAL); goto fail; } if (ts_st->pid == service->pmt.pid) { av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid); ret = AVERROR(EINVAL); goto fail; } for (j = 0; j < i; j++) { if (pids[j] == ts_st->pid) { av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid); ret = AVERROR(EINVAL); goto fail; } } pids[i] = ts_st->pid; ts_st->payload_pts = AV_NOPTS_VALUE; ts_st->payload_dts = AV_NOPTS_VALUE; ts_st->first_pts_check = 1; ts_st->cc = 15; /* update PCR pid by using the first video stream */ if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && service->pcr_pid == 0x1fff) { service->pcr_pid = ts_st->pid; pcr_st = st; } if (st->codec->codec_id == AV_CODEC_ID_AAC && st->codec->extradata_size > 0) { AVStream *ast; ts_st->amux = avformat_alloc_context(); if (!ts_st->amux) { ret = AVERROR(ENOMEM); goto fail; } ts_st->amux->oformat = av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts", NULL, NULL); if (!ts_st->amux->oformat) { ret = AVERROR(EINVAL); goto fail; } if (!(ast = avformat_new_stream(ts_st->amux, NULL))) { ret = AVERROR(ENOMEM); goto fail; } ret = avcodec_copy_context(ast->codec, st->codec); if (ret != 0) goto fail; ast->time_base = st->time_base; ret = avformat_write_header(ts_st->amux, NULL); if (ret < 0) goto fail; } if (st->codec->codec_id == AV_CODEC_ID_OPUS) { ts_st->opus_pending_trim_start = st->codec->initial_padding * 48000 / st->codec->sample_rate; } } av_freep(&pids); /* if no video stream, use the first stream as PCR */ if (service->pcr_pid == 0x1fff && s->nb_streams > 0) { pcr_st = s->streams[0]; ts_st = pcr_st->priv_data; service->pcr_pid = ts_st->pid; } else ts_st = pcr_st->priv_data; if (ts->mux_rate > 1) { service->pcr_packet_period = (ts->mux_rate * ts->pcr_period) / (TS_PACKET_SIZE * 8 * 1000); ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) / (TS_PACKET_SIZE * 8 * 1000); ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) / (TS_PACKET_SIZE * 8 * 1000); if (ts->copyts < 1) ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE); } else { /* Arbitrary values, PAT/PMT will also be written on video key frames */ ts->sdt_packet_period = 200; ts->pat_packet_period = 40; if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { if (!pcr_st->codec->frame_size) { av_log(s, AV_LOG_WARNING, "frame size not set\n"); service->pcr_packet_period = pcr_st->codec->sample_rate / (10 * 512); } else { service->pcr_packet_period = pcr_st->codec->sample_rate / (10 * pcr_st->codec->frame_size); } } else { // max delta PCR 0.1s // TODO: should be avg_frame_rate service->pcr_packet_period = ts_st->user_tb.den / (10 * ts_st->user_tb.num); } if (!service->pcr_packet_period) service->pcr_packet_period = 1; } ts->last_pat_ts = AV_NOPTS_VALUE; ts->last_sdt_ts = AV_NOPTS_VALUE; // The user specified a period, use only it if (ts->pat_period < INT_MAX/2) { ts->pat_packet_period = INT_MAX; } if (ts->sdt_period < INT_MAX/2) { ts->sdt_packet_period = INT_MAX; } // output a PCR as soon as possible service->pcr_packet_count = service->pcr_packet_period; ts->pat_packet_count = ts->pat_packet_period - 1; ts->sdt_packet_count = ts->sdt_packet_period - 1; if (ts->mux_rate == 1) av_log(s, AV_LOG_VERBOSE, "muxrate VBR, "); else av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate); av_log(s, AV_LOG_VERBOSE, "pcr every %d pkts, sdt every %d, pat/pmt every %d pkts\n", service->pcr_packet_period, ts->sdt_packet_period, ts->pat_packet_period); if (ts->m2ts_mode == -1) { if (av_match_ext(s->filename, "m2ts")) { ts->m2ts_mode = 1; } else { ts->m2ts_mode = 0; } } return 0; fail: av_freep(&pids); for (i = 0; i < s->nb_streams; i++) { st = s->streams[i]; ts_st = st->priv_data; if (ts_st) { av_freep(&ts_st->payload); if (ts_st->amux) { avformat_free_context(ts_st->amux); ts_st->amux = NULL; } } av_freep(&st->priv_data); } for (i = 0; i < ts->nb_services; i++) { service = ts->services[i]; av_freep(&service->provider_name); av_freep(&service->name); av_freep(&service); } av_freep(&ts->services); return ret; }