/* * MPEG2 transport stream (aka DVB) muxer * Copyright (c) 2003 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/bswap.h" #include "libavutil/crc.h" #include "libavcodec/mpegvideo.h" #include "avformat.h" #include "mpegts.h" /* write DVB SI sections */ /*********************************************/ /* mpegts section writer */ typedef struct MpegTSSection { int pid; int cc; void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet); void *opaque; } MpegTSSection; typedef struct MpegTSService { MpegTSSection pmt; /* MPEG2 pmt table context */ int sid; /* service ID */ char *name; char *provider_name; int pcr_pid; int pcr_packet_count; int pcr_packet_period; } MpegTSService; typedef struct MpegTSWrite { MpegTSSection pat; /* MPEG2 pat table */ MpegTSSection sdt; /* MPEG2 sdt table context */ MpegTSService **services; int sdt_packet_count; int sdt_packet_period; int pat_packet_count; int pat_packet_period; int nb_services; int onid; int tsid; uint64_t cur_pcr; int mux_rate; } MpegTSWrite; /* NOTE: 4 bytes must be left at the end for the crc32 */ static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len) { MpegTSWrite *ts = ((AVFormatContext*)s->opaque)->priv_data; unsigned int crc; unsigned char packet[TS_PACKET_SIZE]; const unsigned char *buf_ptr; unsigned char *q; int first, b, len1, left; crc = bswap_32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4)); buf[len - 4] = (crc >> 24) & 0xff; buf[len - 3] = (crc >> 16) & 0xff; buf[len - 2] = (crc >> 8) & 0xff; buf[len - 1] = (crc) & 0xff; /* send each packet */ buf_ptr = buf; while (len > 0) { first = (buf == buf_ptr); q = packet; *q++ = 0x47; b = (s->pid >> 8); if (first) b |= 0x40; *q++ = b; *q++ = s->pid; s->cc = (s->cc + 1) & 0xf; *q++ = 0x10 | s->cc; if (first) *q++ = 0; /* 0 offset */ len1 = TS_PACKET_SIZE - (q - packet); if (len1 > len) len1 = len; memcpy(q, buf_ptr, len1); q += len1; /* add known padding data */ left = TS_PACKET_SIZE - (q - packet); if (left > 0) memset(q, 0xff, left); s->write_packet(s, packet); buf_ptr += len1; len -= len1; ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; } } static inline void put16(uint8_t **q_ptr, int val) { uint8_t *q; q = *q_ptr; *q++ = val >> 8; *q++ = val; *q_ptr = q; } static int mpegts_write_section1(MpegTSSection *s, int tid, int id, int version, int sec_num, int last_sec_num, uint8_t *buf, int len) { uint8_t section[1024], *q; unsigned int tot_len; tot_len = 3 + 5 + len + 4; /* check if not too big */ if (tot_len > 1024) return -1; q = section; *q++ = tid; put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */ put16(&q, id); *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */ *q++ = sec_num; *q++ = last_sec_num; memcpy(q, buf, len); mpegts_write_section(s, section, tot_len); return 0; } /*********************************************/ /* mpegts writer */ #define DEFAULT_PMT_START_PID 0x1000 #define DEFAULT_START_PID 0x0100 #define DEFAULT_PROVIDER_NAME "FFmpeg" #define DEFAULT_SERVICE_NAME "Service01" /* default network id, transport stream and service identifiers */ #define DEFAULT_ONID 0x0001 #define DEFAULT_TSID 0x0001 #define DEFAULT_SID 0x0001 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */ #define DEFAULT_PES_HEADER_FREQ 16 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170) /* we retransmit the SI info at this rate */ #define SDT_RETRANS_TIME 500 #define PAT_RETRANS_TIME 100 #define PCR_RETRANS_TIME 20 typedef struct MpegTSWriteStream { struct MpegTSService *service; int pid; /* stream associated pid */ int cc; int payload_index; int first_pts_check; ///< first pts check needed int64_t payload_pts; int64_t payload_dts; uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE]; } MpegTSWriteStream; static void mpegts_write_pat(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; MpegTSService *service; uint8_t data[1012], *q; int i; q = data; for(i = 0; i < ts->nb_services; i++) { service = ts->services[i]; put16(&q, service->sid); put16(&q, 0xe000 | service->pmt.pid); } mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0, data, q - data); } static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service) { // MpegTSWrite *ts = s->priv_data; uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr; int val, stream_type, i; q = data; put16(&q, 0xe000 | service->pcr_pid); program_info_length_ptr = q; q += 2; /* patched after */ /* put program info here */ val = 0xf000 | (q - program_info_length_ptr - 2); program_info_length_ptr[0] = val >> 8; program_info_length_ptr[1] = val; for(i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; MpegTSWriteStream *ts_st = st->priv_data; AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0); switch(st->codec->codec_id) { case CODEC_ID_MPEG1VIDEO: case CODEC_ID_MPEG2VIDEO: stream_type = STREAM_TYPE_VIDEO_MPEG2; break; case CODEC_ID_MPEG4: stream_type = STREAM_TYPE_VIDEO_MPEG4; break; case CODEC_ID_H264: stream_type = STREAM_TYPE_VIDEO_H264; break; case CODEC_ID_DIRAC: stream_type = STREAM_TYPE_VIDEO_DIRAC; break; case CODEC_ID_MP2: case CODEC_ID_MP3: stream_type = STREAM_TYPE_AUDIO_MPEG1; break; case CODEC_ID_AAC: stream_type = STREAM_TYPE_AUDIO_AAC; break; case CODEC_ID_AC3: stream_type = STREAM_TYPE_AUDIO_AC3; break; default: stream_type = STREAM_TYPE_PRIVATE_DATA; break; } *q++ = stream_type; put16(&q, 0xe000 | ts_st->pid); desc_length_ptr = q; q += 2; /* patched after */ /* write optional descriptors here */ switch(st->codec->codec_type) { case CODEC_TYPE_AUDIO: if (lang && strlen(lang->value) == 3) { *q++ = 0x0a; /* ISO 639 language descriptor */ *q++ = 4; *q++ = lang->value[0]; *q++ = lang->value[1]; *q++ = lang->value[2]; *q++ = 0; /* undefined type */ } break; case CODEC_TYPE_SUBTITLE: { const char *language; language = lang && strlen(lang->value)==3 ? lang->value : "eng"; *q++ = 0x59; *q++ = 8; *q++ = language[0]; *q++ = language[1]; *q++ = language[2]; *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */ put16(&q, 1); /* page id */ put16(&q, 1); /* ancillary page id */ } break; case CODEC_TYPE_VIDEO: if (stream_type == STREAM_TYPE_VIDEO_DIRAC) { *q++ = 0x05; /*MPEG-2 registration descriptor*/ *q++ = 4; *q++ = 'd'; *q++ = 'r'; *q++ = 'a'; *q++ = 'c'; } break; } val = 0xf000 | (q - desc_length_ptr - 2); desc_length_ptr[0] = val >> 8; desc_length_ptr[1] = val; } mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0, data, q - data); } /* NOTE: str == NULL is accepted for an empty string */ static void putstr8(uint8_t **q_ptr, const char *str) { uint8_t *q; int len; q = *q_ptr; if (!str) len = 0; else len = strlen(str); *q++ = len; memcpy(q, str, len); q += len; *q_ptr = q; } static void mpegts_write_sdt(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; MpegTSService *service; uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr; int i, running_status, free_ca_mode, val; q = data; put16(&q, ts->onid); *q++ = 0xff; for(i = 0; i < ts->nb_services; i++) { service = ts->services[i]; put16(&q, service->sid); *q++ = 0xfc | 0x00; /* currently no EIT info */ desc_list_len_ptr = q; q += 2; running_status = 4; /* running */ free_ca_mode = 0; /* write only one descriptor for the service name and provider */ *q++ = 0x48; desc_len_ptr = q; q++; *q++ = 0x01; /* digital television service */ putstr8(&q, service->provider_name); putstr8(&q, service->name); desc_len_ptr[0] = q - desc_len_ptr - 1; /* fill descriptor length */ val = (running_status << 13) | (free_ca_mode << 12) | (q - desc_list_len_ptr - 2); desc_list_len_ptr[0] = val >> 8; desc_list_len_ptr[1] = val; } mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0, data, q - data); } static MpegTSService *mpegts_add_service(MpegTSWrite *ts, int sid, const char *provider_name, const char *name) { MpegTSService *service; service = av_mallocz(sizeof(MpegTSService)); if (!service) return NULL; service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1; service->sid = sid; service->provider_name = av_strdup(provider_name); service->name = av_strdup(name); service->pcr_pid = 0x1fff; dynarray_add(&ts->services, &ts->nb_services, service); return service; } static void section_write_packet(MpegTSSection *s, const uint8_t *packet) { AVFormatContext *ctx = s->opaque; put_buffer(ctx->pb, packet, TS_PACKET_SIZE); } static int mpegts_write_header(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; MpegTSWriteStream *ts_st; MpegTSService *service; AVStream *st; AVMetadataTag *title; int i, total_bit_rate; const char *service_name; uint64_t sdt_size, pat_pmt_size, pos; ts->tsid = DEFAULT_TSID; ts->onid = DEFAULT_ONID; /* allocate a single DVB service */ title = av_metadata_get(s->metadata, "title", NULL, 0); service_name = title ? title->value : DEFAULT_SERVICE_NAME; service = mpegts_add_service(ts, DEFAULT_SID, DEFAULT_PROVIDER_NAME, service_name); service->pmt.write_packet = section_write_packet; service->pmt.opaque = s; ts->pat.pid = PAT_PID; ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write 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; /* assign pids to each stream */ total_bit_rate = 0; for(i = 0;i < s->nb_streams; i++) { st = s->streams[i]; ts_st = av_mallocz(sizeof(MpegTSWriteStream)); if (!ts_st) goto fail; st->priv_data = ts_st; ts_st->service = service; ts_st->pid = DEFAULT_START_PID + i; 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 == CODEC_TYPE_VIDEO && service->pcr_pid == 0x1fff) service->pcr_pid = ts_st->pid; if (st->codec->rc_max_rate) total_bit_rate += st->codec->rc_max_rate; else { if (!st->codec->bit_rate) { av_log(s, AV_LOG_WARNING, "stream %d, bit rate is not set, this will cause problems\n", st->index); } total_bit_rate += st->codec->bit_rate; } /* PES header size */ if (st->codec->codec_type == CODEC_TYPE_VIDEO || st->codec->codec_type == CODEC_TYPE_SUBTITLE) { /* 1 PES per frame * 19 bytes of PES header * on average a half TS-packet (184/2) of padding-overhead every PES */ total_bit_rate += (19 + 184/2)*8 / av_q2d(st->codec->time_base); } else { /* 1 PES per DEFAULT_PES_PAYLOAD_SIZE bytes of audio data * 14 bytes of PES header * on average a half TS-packet (184/2) of padding-overhead every PES */ total_bit_rate += (14 + 184/2) * st->codec->bit_rate / DEFAULT_PES_PAYLOAD_SIZE; } } /* if no video stream, use the first stream as PCR */ if (service->pcr_pid == 0x1fff && s->nb_streams > 0) { ts_st = s->streams[0]->priv_data; service->pcr_pid = ts_st->pid; } ts->mux_rate = 1; // avoid div by 0 /* write info at the start of the file, so that it will be fast to find them */ pos = url_ftell(s->pb); mpegts_write_sdt(s); sdt_size = url_ftell(s->pb) - pos; pos = url_ftell(s->pb); mpegts_write_pat(s); for(i = 0; i < ts->nb_services; i++) { mpegts_write_pmt(s, ts->services[i]); } pat_pmt_size = url_ftell(s->pb) - pos; if (total_bit_rate <= 8 * 1024) total_bit_rate = 8 * 1024; total_bit_rate += total_bit_rate * 4 / (TS_PACKET_SIZE-4) + /* TS header size */ 1000 * 8 * sdt_size / SDT_RETRANS_TIME + /* SDT size */ 1000 * 8 * pat_pmt_size / PAT_RETRANS_TIME + /* PAT+PMT size */ 1000 * 8 * 8 / PCR_RETRANS_TIME; /* PCR size */ if (s->mux_rate) ts->mux_rate = s->mux_rate; else ts->mux_rate = total_bit_rate; service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) / (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); // output a PCR as soon as possible service->pcr_packet_count = service->pcr_packet_period; av_log(s, AV_LOG_DEBUG, "calculated bitrate %d bps, muxrate %d bps, " "sdt every %d, pat/pmt every %d pkts\n", total_bit_rate, ts->mux_rate, ts->sdt_packet_period, ts->pat_packet_period); // adjust pcr ts->cur_pcr /= ts->mux_rate; put_flush_packet(s->pb); return 0; fail: for(i = 0;i < s->nb_streams; i++) { st = s->streams[i]; av_free(st->priv_data); } return -1; } /* send SDT, PAT and PMT tables regulary */ static void retransmit_si_info(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; int i; if (++ts->sdt_packet_count == ts->sdt_packet_period) { ts->sdt_packet_count = 0; mpegts_write_sdt(s); } if (++ts->pat_packet_count == ts->pat_packet_period) { ts->pat_packet_count = 0; mpegts_write_pat(s); for(i = 0; i < ts->nb_services; i++) { mpegts_write_pmt(s, ts->services[i]); } } } /* Write a single null transport stream packet */ static void mpegts_insert_null_packet(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; uint8_t *q; uint8_t buf[TS_PACKET_SIZE]; q = buf; *q++ = 0x47; *q++ = 0x00 | 0x1f; *q++ = 0xff; *q++ = 0x10; memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf)); put_buffer(s->pb, buf, TS_PACKET_SIZE); ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; } /* Write a single transport stream packet with a PCR and no payload */ static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st) { MpegTSWrite *ts = s->priv_data; MpegTSWriteStream *ts_st = st->priv_data; uint8_t *q; uint64_t pcr = ts->cur_pcr; uint8_t buf[TS_PACKET_SIZE]; q = buf; *q++ = 0x47; *q++ = ts_st->pid >> 8; *q++ = ts_st->pid; *q++ = 0x20 | ts_st->cc; /* Adaptation only */ /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */ *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */ *q++ = 0x10; /* Adaptation flags: PCR present */ /* PCR coded into 6 bytes */ *q++ = pcr >> 25; *q++ = pcr >> 17; *q++ = pcr >> 9; *q++ = pcr >> 1; *q++ = (pcr & 1) << 7; *q++ = 0; /* stuffing bytes */ memset(q, 0xFF, TS_PACKET_SIZE - (q - buf)); put_buffer(s->pb, buf, TS_PACKET_SIZE); ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; } static void write_pts(uint8_t *q, int fourbits, int64_t pts) { int val; val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1; *q++ = val; val = (((pts >> 15) & 0x7fff) << 1) | 1; *q++ = val >> 8; *q++ = val; val = (((pts) & 0x7fff) << 1) | 1; *q++ = val >> 8; *q++ = val; } /* Add a pes header to the front of payload, and segment into an integer number of * ts packets. The final ts packet is padded using an over-sized adaptation header * to exactly fill the last ts packet. * NOTE: 'payload' contains a complete PES payload. */ static void mpegts_write_pes(AVFormatContext *s, AVStream *st, const uint8_t *payload, int payload_size, int64_t pts, int64_t dts) { MpegTSWriteStream *ts_st = st->priv_data; MpegTSWrite *ts = s->priv_data; uint8_t buf[TS_PACKET_SIZE]; uint8_t *q; int val, is_start, len, header_len, write_pcr, private_code, flags; int afc_len, stuffing_len; int64_t pcr = -1; /* avoid warning */ int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE); is_start = 1; while (payload_size > 0) { retransmit_si_info(s); write_pcr = 0; if (ts_st->pid == ts_st->service->pcr_pid) { ts_st->service->pcr_packet_count++; if (ts_st->service->pcr_packet_count >= ts_st->service->pcr_packet_period) { ts_st->service->pcr_packet_count = 0; write_pcr = 1; } } if (dts != AV_NOPTS_VALUE && (dts - (int64_t)ts->cur_pcr) > delay) { /* pcr insert gets priority over null packet insert */ if (write_pcr) mpegts_insert_pcr_only(s, st); else mpegts_insert_null_packet(s); continue; /* recalculate write_pcr and possibly retransmit si_info */ } /* prepare packet header */ q = buf; *q++ = 0x47; val = (ts_st->pid >> 8); if (is_start) val |= 0x40; *q++ = val; *q++ = ts_st->pid; ts_st->cc = (ts_st->cc + 1) & 0xf; *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0); if (write_pcr) { // add 11, pcr references the last byte of program clock reference base pcr = ts->cur_pcr + (4+7)*8*90000LL / ts->mux_rate; if (dts != AV_NOPTS_VALUE && dts < pcr) av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n"); *q++ = 7; /* AFC length */ *q++ = 0x10; /* flags: PCR present */ *q++ = pcr >> 25; *q++ = pcr >> 17; *q++ = pcr >> 9; *q++ = pcr >> 1; *q++ = (pcr & 1) << 7; *q++ = 0; } if (is_start) { int pes_extension = 0; /* write PES header */ *q++ = 0x00; *q++ = 0x00; *q++ = 0x01; private_code = 0; if (st->codec->codec_type == CODEC_TYPE_VIDEO) { if (st->codec->codec_id == CODEC_ID_DIRAC) { *q++ = 0xfd; } else *q++ = 0xe0; } else if (st->codec->codec_type == CODEC_TYPE_AUDIO && (st->codec->codec_id == CODEC_ID_MP2 || st->codec->codec_id == CODEC_ID_MP3)) { *q++ = 0xc0; } else { *q++ = 0xbd; if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) { private_code = 0x20; } } header_len = 0; flags = 0; if (pts != AV_NOPTS_VALUE) { header_len += 5; flags |= 0x80; } if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) { header_len += 5; flags |= 0x40; } if (st->codec->codec_type == CODEC_TYPE_VIDEO && st->codec->codec_id == CODEC_ID_DIRAC) { /* set PES_extension_flag */ pes_extension = 1; flags |= 0x01; /* * One byte for PES2 extension flag + * one byte for extension length + * one byte for extension id */ header_len += 3; } len = payload_size + header_len + 3; if (private_code != 0) len++; if (len > 0xffff) len = 0; *q++ = len >> 8; *q++ = len; val = 0x80; /* data alignment indicator is required for subtitle data */ if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) val |= 0x04; *q++ = val; *q++ = flags; *q++ = header_len; if (pts != AV_NOPTS_VALUE) { write_pts(q, flags >> 6, pts); q += 5; } if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) { write_pts(q, 1, dts); q += 5; } if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) { flags = 0x01; /* set PES_extension_flag_2 */ *q++ = flags; *q++ = 0x80 | 0x01; /* marker bit + extension length */ /* * Set the stream id extension flag bit to 0 and * write the extended stream id */ *q++ = 0x00 | 0x60; } if (private_code != 0) *q++ = private_code; is_start = 0; } /* header size */ header_len = q - buf; /* data len */ len = TS_PACKET_SIZE - header_len; if (len > payload_size) len = payload_size; stuffing_len = TS_PACKET_SIZE - header_len - len; if (stuffing_len > 0) { /* add stuffing with AFC */ if (buf[3] & 0x20) { /* stuffing already present: increase its size */ afc_len = buf[4] + 1; memmove(buf + 4 + afc_len + stuffing_len, buf + 4 + afc_len, header_len - (4 + afc_len)); buf[4] += stuffing_len; memset(buf + 4 + afc_len, 0xff, stuffing_len); } else { /* add stuffing */ memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4); buf[3] |= 0x20; buf[4] = stuffing_len - 1; if (stuffing_len >= 2) { buf[5] = 0x00; memset(buf + 6, 0xff, stuffing_len - 2); } } } memcpy(buf + TS_PACKET_SIZE - len, payload, len); payload += len; payload_size -= len; put_buffer(s->pb, buf, TS_PACKET_SIZE); ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate; } put_flush_packet(s->pb); } static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt) { AVStream *st = s->streams[pkt->stream_index]; int size = pkt->size; uint8_t *buf= pkt->data; uint8_t *data= NULL; MpegTSWriteStream *ts_st = st->priv_data; const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE); int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE; if (pkt->pts != AV_NOPTS_VALUE) pts = pkt->pts + delay; if (pkt->dts != AV_NOPTS_VALUE) dts = pkt->dts + delay; if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) { av_log(s, AV_LOG_ERROR, "first pts value must set\n"); return -1; } ts_st->first_pts_check = 0; if (st->codec->codec_id == CODEC_ID_H264) { if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) { av_log(s, AV_LOG_ERROR, "h264 bitstream malformated\n"); return -1; } if (pkt->data[4] != 0x09) { // AUD NAL data = av_malloc(pkt->size+6); if (!data) return -1; memcpy(data+6, pkt->data, pkt->size); AV_WB32(data, 0x00000001); data[4] = 0x09; data[5] = 0xe0; // any slice type buf = data; size = pkt->size+6; } } if (st->codec->codec_type != CODEC_TYPE_AUDIO) { // for video and subtitle, write a single pes packet mpegts_write_pes(s, st, buf, size, pts, dts); av_free(data); return 0; } if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) { mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, ts_st->payload_pts, ts_st->payload_dts); ts_st->payload_index = 0; } if (!ts_st->payload_index) { ts_st->payload_pts = pts; ts_st->payload_dts = dts; } memcpy(ts_st->payload + ts_st->payload_index, buf, size); ts_st->payload_index += size; return 0; } static int mpegts_write_end(AVFormatContext *s) { MpegTSWrite *ts = s->priv_data; MpegTSWriteStream *ts_st; MpegTSService *service; AVStream *st; int i; /* flush current packets */ for(i = 0; i < s->nb_streams; i++) { st = s->streams[i]; ts_st = st->priv_data; if (ts_st->payload_index > 0) { mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, ts_st->payload_pts, ts_st->payload_dts); } } put_flush_packet(s->pb); for(i = 0; i < ts->nb_services; i++) { service = ts->services[i]; av_freep(&service->provider_name); av_freep(&service->name); av_free(service); } av_free(ts->services); return 0; } AVOutputFormat mpegts_muxer = { "mpegts", NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"), "video/x-mpegts", "ts,m2t", sizeof(MpegTSWrite), CODEC_ID_MP2, CODEC_ID_MPEG2VIDEO, mpegts_write_header, mpegts_write_packet, mpegts_write_end, };