2 * MPEG-2 transport stream (aka DVB) muxer
3 * Copyright (c) 2003 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/bswap.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/dict.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/mathematics.h"
27 #include "libavutil/opt.h"
29 #include "libavcodec/internal.h"
32 #include "avio_internal.h"
36 #define PCR_TIME_BASE 27000000
38 /* write DVB SI sections */
40 #define DVB_PRIVATE_NETWORK_START 0xff01
42 /*********************************************/
43 /* mpegts section writer */
45 typedef struct MpegTSSection {
48 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
52 typedef struct MpegTSService {
53 MpegTSSection pmt; /* MPEG-2 PMT table context */
54 int sid; /* service ID */
59 int pcr_packet_period;
62 typedef struct MpegTSWrite {
63 const AVClass *av_class;
64 MpegTSSection pat; /* MPEG-2 PAT table */
65 MpegTSSection sdt; /* MPEG-2 SDT table context */
66 MpegTSService **services;
68 int sdt_packet_period;
70 int pat_packet_period;
75 int mux_rate; ///< set to 1 when VBR
78 int transport_stream_id;
79 int original_network_id;
86 int reemit_pat_pmt; // backward compatibility
89 #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
90 #define MPEGTS_FLAG_AAC_LATM 0x02
91 #define MPEGTS_FLAG_SYSTEM_B 0x04
95 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
96 #define DEFAULT_PES_HEADER_FREQ 16
97 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
99 /* The section length is 12 bits. The first 2 are set to 0, the remaining
100 * 10 bits should not exceed 1021. */
101 #define SECTION_LENGTH 1020
103 /* NOTE: 4 bytes must be left at the end for the crc32 */
104 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
107 unsigned char packet[TS_PACKET_SIZE];
108 const unsigned char *buf_ptr;
110 int first, b, len1, left;
112 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE),
115 buf[len - 4] = (crc >> 24) & 0xff;
116 buf[len - 3] = (crc >> 16) & 0xff;
117 buf[len - 2] = (crc >> 8) & 0xff;
118 buf[len - 1] = crc & 0xff;
120 /* send each packet */
123 first = buf == buf_ptr;
131 s->cc = s->cc + 1 & 0xf;
134 *q++ = 0; /* 0 offset */
135 len1 = TS_PACKET_SIZE - (q - packet);
138 memcpy(q, buf_ptr, len1);
140 /* add known padding data */
141 left = TS_PACKET_SIZE - (q - packet);
143 memset(q, 0xff, left);
145 s->write_packet(s, packet);
152 static inline void put16(uint8_t **q_ptr, int val)
161 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
162 int version, int sec_num, int last_sec_num,
163 uint8_t *buf, int len)
165 uint8_t section[1024], *q;
166 unsigned int tot_len;
167 /* reserved_future_use field must be set to 1 for SDT */
168 unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
170 tot_len = 3 + 5 + len + 4;
171 /* check if not too big */
173 return AVERROR_INVALIDDATA;
177 put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
179 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
184 mpegts_write_section(s, section, tot_len);
188 /*********************************************/
191 #define DEFAULT_PROVIDER_NAME "Libav"
192 #define DEFAULT_SERVICE_NAME "Service01"
194 /* we retransmit the SI info at this rate */
195 #define SDT_RETRANS_TIME 500
196 #define PAT_RETRANS_TIME 100
197 #define PCR_RETRANS_TIME 20
199 typedef struct MpegTSWriteStream {
200 struct MpegTSService *service;
201 int pid; /* stream associated pid */
204 int first_pts_check; ///< first pts check needed
209 AVFormatContext *amux;
213 static void mpegts_write_pat(AVFormatContext *s)
215 MpegTSWrite *ts = s->priv_data;
216 MpegTSService *service;
217 uint8_t data[SECTION_LENGTH], *q;
221 for (i = 0; i < ts->nb_services; i++) {
222 service = ts->services[i];
223 put16(&q, service->sid);
224 put16(&q, 0xe000 | service->pmt.pid);
226 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
230 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
232 MpegTSWrite *ts = s->priv_data;
233 uint8_t data[SECTION_LENGTH], *q, *desc_length_ptr, *program_info_length_ptr;
234 int val, stream_type, i, err = 0;
237 put16(&q, 0xe000 | service->pcr_pid);
239 program_info_length_ptr = q;
240 q += 2; /* patched after */
242 /* put program info here */
244 val = 0xf000 | (q - program_info_length_ptr - 2);
245 program_info_length_ptr[0] = val >> 8;
246 program_info_length_ptr[1] = val;
248 for (i = 0; i < s->nb_streams; i++) {
249 AVStream *st = s->streams[i];
250 MpegTSWriteStream *ts_st = st->priv_data;
251 AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL, 0);
253 if (q - data > SECTION_LENGTH - 3 - 2 - 6) {
257 switch (st->codecpar->codec_id) {
258 case AV_CODEC_ID_MPEG1VIDEO:
259 case AV_CODEC_ID_MPEG2VIDEO:
260 stream_type = STREAM_TYPE_VIDEO_MPEG2;
262 case AV_CODEC_ID_MPEG4:
263 stream_type = STREAM_TYPE_VIDEO_MPEG4;
265 case AV_CODEC_ID_H264:
266 stream_type = STREAM_TYPE_VIDEO_H264;
268 case AV_CODEC_ID_HEVC:
269 stream_type = STREAM_TYPE_VIDEO_HEVC;
271 case AV_CODEC_ID_CAVS:
272 stream_type = STREAM_TYPE_VIDEO_CAVS;
274 case AV_CODEC_ID_DIRAC:
275 stream_type = STREAM_TYPE_VIDEO_DIRAC;
277 case AV_CODEC_ID_MP2:
278 case AV_CODEC_ID_MP3:
279 stream_type = STREAM_TYPE_AUDIO_MPEG1;
281 case AV_CODEC_ID_AAC:
282 stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM)
283 ? STREAM_TYPE_AUDIO_AAC_LATM
284 : STREAM_TYPE_AUDIO_AAC;
286 case AV_CODEC_ID_AAC_LATM:
287 stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
289 case AV_CODEC_ID_AC3:
290 stream_type = (ts->flags & MPEGTS_FLAG_SYSTEM_B)
291 ? STREAM_TYPE_PRIVATE_DATA
292 : STREAM_TYPE_AUDIO_AC3;
295 stream_type = STREAM_TYPE_PRIVATE_DATA;
299 put16(&q, 0xe000 | ts_st->pid);
301 q += 2; /* patched after */
303 /* write optional descriptors here */
304 switch (st->codecpar->codec_type) {
305 case AVMEDIA_TYPE_AUDIO:
306 if (st->codecpar->codec_id == AV_CODEC_ID_AC3 && (ts->flags & MPEGTS_FLAG_SYSTEM_B)) {
307 *q++ = 0x6a; /* ETSI EN 300 468 AC-3 descriptor */
314 char *next = lang->value;
317 *q++ = 0x0a; /* ISO 639 language descriptor */
321 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
322 if (q - data > SECTION_LENGTH - 4) {
326 next = strchr(p, ',');
327 if (strlen(p) != 3 && (!next || next != p + 3))
328 continue; /* not a 3-letter code */
334 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
336 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
338 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
341 *q++ = 0; /* undefined type */
347 q -= 2; /* no language codes were written */
350 case AVMEDIA_TYPE_SUBTITLE:
352 const char *language;
353 language = lang && strlen(lang->value) == 3 ? lang->value : "eng";
359 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
361 if (q - data > SECTION_LENGTH - 4) {
366 if (st->codecpar->extradata_size == 4) {
367 memcpy(q, st->codecpar->extradata, 4);
370 put16(&q, 1); /* page id */
371 put16(&q, 1); /* ancillary page id */
375 case AVMEDIA_TYPE_VIDEO:
376 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
377 *q++ = 0x05; /*MPEG-2 registration descriptor*/
387 val = 0xf000 | (q - desc_length_ptr - 2);
388 desc_length_ptr[0] = val >> 8;
389 desc_length_ptr[1] = val;
393 av_log(s, AV_LOG_ERROR,
394 "The PMT section cannot fit stream %d and all following streams.\n"
395 "Try reducing the number of languages in the audio streams "
396 "or the total number of streams.\n", i);
398 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
402 /* NOTE: str == NULL is accepted for an empty string */
403 static void putstr8(uint8_t **q_ptr, const char *str)
419 static void mpegts_write_sdt(AVFormatContext *s)
421 MpegTSWrite *ts = s->priv_data;
422 MpegTSService *service;
423 uint8_t data[SECTION_LENGTH], *q, *desc_list_len_ptr, *desc_len_ptr;
424 int i, running_status, free_ca_mode, val;
429 for (i = 0; i < ts->nb_services; i++) {
430 service = ts->services[i];
431 put16(&q, service->sid);
432 *q++ = 0xfc | 0x00; /* currently no EIT info */
433 desc_list_len_ptr = q;
435 running_status = 4; /* running */
438 /* write only one descriptor for the service name and provider */
442 *q++ = 0x01; /* digital television service */
443 putstr8(&q, service->provider_name);
444 putstr8(&q, service->name);
445 desc_len_ptr[0] = q - desc_len_ptr - 1;
447 /* fill descriptor length */
448 val = (running_status << 13) | (free_ca_mode << 12) |
449 (q - desc_list_len_ptr - 2);
450 desc_list_len_ptr[0] = val >> 8;
451 desc_list_len_ptr[1] = val;
453 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
457 static MpegTSService *mpegts_add_service(MpegTSWrite *ts, int sid,
458 const char *provider_name,
461 MpegTSService *service;
463 service = av_mallocz(sizeof(MpegTSService));
466 service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
468 service->pcr_pid = 0x1fff;
469 service->provider_name = av_strdup(provider_name);
470 service->name = av_strdup(name);
471 if (!service->provider_name || !service->name) {
472 av_free(service->provider_name);
473 av_free(service->name);
477 dynarray_add(&ts->services, &ts->nb_services, service);
481 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
483 return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
487 static void mpegts_prefix_m2ts_header(AVFormatContext *s)
489 MpegTSWrite *ts = s->priv_data;
491 int64_t pcr = get_pcr(s->priv_data, s->pb);
492 uint32_t tp_extra_header = pcr % 0x3fffffff;
493 tp_extra_header = AV_RB32(&tp_extra_header);
494 avio_write(s->pb, (unsigned char *) &tp_extra_header,
495 sizeof(tp_extra_header));
499 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
501 AVFormatContext *ctx = s->opaque;
502 mpegts_prefix_m2ts_header(ctx);
503 avio_write(ctx->pb, packet, TS_PACKET_SIZE);
506 static int mpegts_write_header(AVFormatContext *s)
508 MpegTSWrite *ts = s->priv_data;
509 MpegTSWriteStream *ts_st;
510 MpegTSService *service;
511 AVStream *st, *pcr_st = NULL;
512 AVDictionaryEntry *title, *provider;
514 const char *service_name;
515 const char *provider_name;
519 if (s->max_delay < 0) /* Not set by the caller */
522 // round up to a whole number of TS packets
523 ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;
525 ts->tsid = ts->transport_stream_id;
526 ts->onid = ts->original_network_id;
527 /* allocate a single DVB service */
528 title = av_dict_get(s->metadata, "service_name", NULL, 0);
530 title = av_dict_get(s->metadata, "title", NULL, 0);
531 service_name = title ? title->value : DEFAULT_SERVICE_NAME;
532 provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
533 provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
534 service = mpegts_add_service(ts, ts->service_id,
535 provider_name, service_name);
538 return AVERROR(ENOMEM);
540 service->pmt.write_packet = section_write_packet;
541 service->pmt.opaque = s;
542 service->pmt.cc = 15;
544 ts->pat.pid = PAT_PID;
545 /* Initialize at 15 so that it wraps and is equal to 0 for the
546 * first packet we write. */
548 ts->pat.write_packet = section_write_packet;
551 ts->sdt.pid = SDT_PID;
553 ts->sdt.write_packet = section_write_packet;
556 pids = av_malloc(s->nb_streams * sizeof(*pids));
559 return AVERROR(ENOMEM);
562 /* assign pids to each stream */
563 for (i = 0; i < s->nb_streams; i++) {
566 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
568 ret = AVERROR(ENOMEM);
571 st->priv_data = ts_st;
573 ts_st->user_tb = st->time_base;
574 avpriv_set_pts_info(st, 33, 1, 90000);
576 ts_st->payload = av_mallocz(ts->pes_payload_size);
577 if (!ts_st->payload) {
578 ret = AVERROR(ENOMEM);
581 ts_st->service = service;
582 /* MPEG pid values < 16 are reserved. Applications which set st->id in
583 * this range are assigned a calculated pid. */
585 ts_st->pid = ts->start_pid + i;
586 } else if (st->id < 0x1FFF) {
589 av_log(s, AV_LOG_ERROR,
590 "Invalid stream id %d, must be less than 8191\n", st->id);
591 ret = AVERROR(EINVAL);
594 if (ts_st->pid == service->pmt.pid) {
595 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
596 ret = AVERROR(EINVAL);
599 for (j = 0; j < i; j++) {
600 if (pids[j] == ts_st->pid) {
601 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
602 ret = AVERROR(EINVAL);
606 pids[i] = ts_st->pid;
607 ts_st->payload_pts = AV_NOPTS_VALUE;
608 ts_st->payload_dts = AV_NOPTS_VALUE;
609 ts_st->first_pts_check = 1;
611 /* update PCR pid by using the first video stream */
612 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
613 service->pcr_pid == 0x1fff) {
614 service->pcr_pid = ts_st->pid;
617 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
618 st->codecpar->extradata_size > 0) {
620 ts_st->amux = avformat_alloc_context();
622 ret = AVERROR(ENOMEM);
625 ts_st->amux->oformat =
626 av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts",
628 if (!ts_st->amux->oformat) {
629 ret = AVERROR(EINVAL);
632 if (!(ast = avformat_new_stream(ts_st->amux, NULL))) {
633 ret = AVERROR(ENOMEM);
636 ret = avcodec_parameters_copy(ast->codecpar, st->codecpar);
639 ast->time_base = st->time_base;
640 ret = avformat_write_header(ts_st->amux, NULL);
648 /* if no video stream, use the first stream as PCR */
649 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
650 pcr_st = s->streams[0];
651 ts_st = pcr_st->priv_data;
652 service->pcr_pid = ts_st->pid;
654 ts_st = pcr_st->priv_data;
656 if (ts->mux_rate > 1) {
657 service->pcr_packet_period = (ts->mux_rate * ts->pcr_period) /
658 (TS_PACKET_SIZE * 8 * 1000);
659 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
660 (TS_PACKET_SIZE * 8 * 1000);
661 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
662 (TS_PACKET_SIZE * 8 * 1000);
664 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
666 /* Arbitrary values, PAT/PMT could be written on key frames */
667 ts->sdt_packet_period = 200;
668 ts->pat_packet_period = 40;
669 if (pcr_st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
670 int frame_size = av_get_audio_frame_duration2(pcr_st->codecpar, 0);
672 av_log(s, AV_LOG_WARNING, "frame size not set\n");
673 service->pcr_packet_period =
674 pcr_st->codecpar->sample_rate / (10 * 512);
676 service->pcr_packet_period =
677 pcr_st->codecpar->sample_rate / (10 * frame_size);
680 // max delta PCR 0.1s
681 // TODO: should be avg_frame_rate
682 service->pcr_packet_period =
683 ts_st->user_tb.den / (10 * ts_st->user_tb.num);
687 // output a PCR as soon as possible
688 service->pcr_packet_count = service->pcr_packet_period;
689 ts->pat_packet_count = ts->pat_packet_period - 1;
690 ts->sdt_packet_count = ts->sdt_packet_period - 1;
692 if (ts->mux_rate == 1)
693 av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");
695 av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);
696 av_log(s, AV_LOG_VERBOSE,
697 "pcr every %d pkts, sdt every %d, pat/pmt every %d pkts\n",
698 service->pcr_packet_period,
699 ts->sdt_packet_period, ts->pat_packet_period);
701 if (ts->m2ts_mode == -1) {
702 if (av_match_ext(s->filename, "m2ts")) {
716 for (i = 0; i < s->nb_streams; i++) {
718 ts_st = st->priv_data;
720 av_freep(&ts_st->payload);
722 avformat_free_context(ts_st->amux);
726 av_freep(&st->priv_data);
731 /* send SDT, PAT and PMT tables regularly */
732 static void retransmit_si_info(AVFormatContext *s)
734 MpegTSWrite *ts = s->priv_data;
737 if (++ts->sdt_packet_count == ts->sdt_packet_period) {
738 ts->sdt_packet_count = 0;
741 if (++ts->pat_packet_count == ts->pat_packet_period) {
742 ts->pat_packet_count = 0;
744 for (i = 0; i < ts->nb_services; i++)
745 mpegts_write_pmt(s, ts->services[i]);
749 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
751 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
753 *buf++ = pcr_high >> 25;
754 *buf++ = pcr_high >> 17;
755 *buf++ = pcr_high >> 9;
756 *buf++ = pcr_high >> 1;
757 *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
763 /* Write a single null transport stream packet */
764 static void mpegts_insert_null_packet(AVFormatContext *s)
767 uint8_t buf[TS_PACKET_SIZE];
774 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
775 mpegts_prefix_m2ts_header(s);
776 avio_write(s->pb, buf, TS_PACKET_SIZE);
779 /* Write a single transport stream packet with a PCR and no payload */
780 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
782 MpegTSWrite *ts = s->priv_data;
783 MpegTSWriteStream *ts_st = st->priv_data;
785 uint8_t buf[TS_PACKET_SIZE];
789 *q++ = ts_st->pid >> 8;
791 *q++ = 0x20 | ts_st->cc; /* Adaptation only */
792 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
793 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
794 *q++ = 0x10; /* Adaptation flags: PCR present */
796 /* PCR coded into 6 bytes */
797 q += write_pcr_bits(q, get_pcr(ts, s->pb));
800 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
801 mpegts_prefix_m2ts_header(s);
802 avio_write(s->pb, buf, TS_PACKET_SIZE);
805 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
809 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
811 val = (((pts >> 15) & 0x7fff) << 1) | 1;
814 val = (((pts) & 0x7fff) << 1) | 1;
819 /* Set an adaptation field flag in an MPEG-TS packet*/
820 static void set_af_flag(uint8_t *pkt, int flag)
822 // expect at least one flag to set
825 if ((pkt[3] & 0x20) == 0) {
826 // no AF yet, set adaptation field flag
828 // 1 byte length, no flags
835 /* Extend the adaptation field by size bytes */
836 static void extend_af(uint8_t *pkt, int size)
838 // expect already existing adaptation field
839 assert(pkt[3] & 0x20);
843 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
844 static uint8_t *get_ts_payload_start(uint8_t *pkt)
847 return pkt + 5 + pkt[4];
852 /* Add a PES header to the front of the payload, and segment into an integer
853 * number of TS packets. The final TS packet is padded using an oversized
854 * adaptation header to exactly fill the last TS packet.
855 * NOTE: 'payload' contains a complete PES payload. */
856 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
857 const uint8_t *payload, int payload_size,
858 int64_t pts, int64_t dts, int key)
860 MpegTSWriteStream *ts_st = st->priv_data;
861 MpegTSWrite *ts = s->priv_data;
862 uint8_t buf[TS_PACKET_SIZE];
864 int val, is_start, len, header_len, write_pcr, private_code, flags;
865 int afc_len, stuffing_len;
866 int64_t pcr = -1; /* avoid warning */
867 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
870 while (payload_size > 0) {
871 retransmit_si_info(s);
874 if (ts_st->pid == ts_st->service->pcr_pid) {
875 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
876 ts_st->service->pcr_packet_count++;
877 if (ts_st->service->pcr_packet_count >=
878 ts_st->service->pcr_packet_period) {
879 ts_st->service->pcr_packet_count = 0;
884 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
885 (dts - get_pcr(ts, s->pb) / 300) > delay) {
886 /* pcr insert gets priority over null packet insert */
888 mpegts_insert_pcr_only(s, st);
890 mpegts_insert_null_packet(s);
891 /* recalculate write_pcr and possibly retransmit si_info */
895 /* prepare packet header */
898 val = ts_st->pid >> 8;
903 ts_st->cc = ts_st->cc + 1 & 0xf;
904 *q++ = 0x10 | ts_st->cc; // payload indicator + CC
905 if (key && is_start && pts != AV_NOPTS_VALUE) {
906 // set Random Access for key frames
907 if (ts_st->pid == ts_st->service->pcr_pid)
909 set_af_flag(buf, 0x40);
910 q = get_ts_payload_start(buf);
913 set_af_flag(buf, 0x10);
914 q = get_ts_payload_start(buf);
915 // add 11, pcr references the last byte of program clock reference base
916 if (ts->mux_rate > 1)
917 pcr = get_pcr(ts, s->pb);
919 pcr = (dts - delay) * 300;
920 if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
921 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
922 extend_af(buf, write_pcr_bits(q, pcr));
923 q = get_ts_payload_start(buf);
926 int pes_extension = 0;
927 /* write PES header */
932 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
933 if (st->codecpar->codec_id == AV_CODEC_ID_DIRAC)
937 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
938 (st->codecpar->codec_id == AV_CODEC_ID_MP2 ||
939 st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
940 st->codecpar->codec_id == AV_CODEC_ID_AAC)) {
944 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
949 if (pts != AV_NOPTS_VALUE) {
953 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
957 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
958 st->codecpar->codec_id == AV_CODEC_ID_DIRAC) {
959 /* set PES_extension_flag */
963 /* One byte for PES2 extension flag +
964 * one byte for extension length +
965 * one byte for extension id */
968 len = payload_size + header_len + 3;
969 if (private_code != 0)
976 /* data alignment indicator is required for subtitle data */
977 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
982 if (pts != AV_NOPTS_VALUE) {
983 write_pts(q, flags >> 6, pts);
986 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
987 write_pts(q, 1, dts);
990 if (pes_extension && st->codecpar->codec_id == AV_CODEC_ID_DIRAC) {
991 flags = 0x01; /* set PES_extension_flag_2 */
993 *q++ = 0x80 | 0x01; /* marker bit + extension length */
994 /* Set the stream ID extension flag bit to 0 and
995 * write the extended stream ID. */
998 if (private_code != 0)
1003 header_len = q - buf;
1005 len = TS_PACKET_SIZE - header_len;
1006 if (len > payload_size)
1008 stuffing_len = TS_PACKET_SIZE - header_len - len;
1009 if (stuffing_len > 0) {
1010 /* add stuffing with AFC */
1011 if (buf[3] & 0x20) {
1012 /* stuffing already present: increase its size */
1013 afc_len = buf[4] + 1;
1014 memmove(buf + 4 + afc_len + stuffing_len,
1016 header_len - (4 + afc_len));
1017 buf[4] += stuffing_len;
1018 memset(buf + 4 + afc_len, 0xff, stuffing_len);
1021 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
1023 buf[4] = stuffing_len - 1;
1024 if (stuffing_len >= 2) {
1026 memset(buf + 6, 0xff, stuffing_len - 2);
1030 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
1032 payload_size -= len;
1033 mpegts_prefix_m2ts_header(s);
1034 avio_write(s->pb, buf, TS_PACKET_SIZE);
1039 static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1041 AVStream *st = s->streams[pkt->stream_index];
1042 int size = pkt->size;
1043 uint8_t *buf = pkt->data;
1044 uint8_t *data = NULL;
1045 MpegTSWrite *ts = s->priv_data;
1046 MpegTSWriteStream *ts_st = st->priv_data;
1047 const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE) * 2;
1048 int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
1050 if (ts->reemit_pat_pmt) {
1051 av_log(s, AV_LOG_WARNING,
1052 "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");
1053 ts->reemit_pat_pmt = 0;
1054 ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;
1057 if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
1058 ts->pat_packet_count = ts->pat_packet_period - 1;
1059 ts->sdt_packet_count = ts->sdt_packet_period - 1;
1060 ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;
1063 if (pkt->pts != AV_NOPTS_VALUE)
1064 pts = pkt->pts + delay;
1065 if (pkt->dts != AV_NOPTS_VALUE)
1066 dts = pkt->dts + delay;
1068 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
1069 av_log(s, AV_LOG_ERROR, "first pts value must set\n");
1070 return AVERROR_INVALIDDATA;
1072 ts_st->first_pts_check = 0;
1074 if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
1075 const uint8_t *p = buf, *buf_end = p + size;
1076 uint32_t state = -1;
1078 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
1079 av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
1080 "no startcode found, use -bsf h264_mp4toannexb\n");
1081 return AVERROR_INVALIDDATA;
1085 p = avpriv_find_start_code(p, buf_end, &state);
1086 av_log(s, AV_LOG_TRACE, "nal %"PRIu32"\n", state & 0x1f);
1087 } while (p < buf_end && (state & 0x1f) != 9 &&
1088 (state & 0x1f) != 5 && (state & 0x1f) != 1);
1090 if ((state & 0x1f) != 9) { // AUD NAL
1091 data = av_malloc(pkt->size + 6);
1093 return AVERROR(ENOMEM);
1094 memcpy(data + 6, pkt->data, pkt->size);
1095 AV_WB32(data, 0x00000001);
1097 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
1099 size = pkt->size + 6;
1101 } else if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
1102 if (pkt->size < 2) {
1103 av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
1104 return AVERROR_INVALIDDATA;
1106 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
1111 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
1112 "and extradata missing\n");
1113 return AVERROR_INVALIDDATA;
1116 av_init_packet(&pkt2);
1117 pkt2.data = pkt->data;
1118 pkt2.size = pkt->size;
1120 ret = avio_open_dyn_buf(&ts_st->amux->pb);
1122 return AVERROR(ENOMEM);
1124 ret = av_write_frame(ts_st->amux, &pkt2);
1126 ffio_free_dyn_buf(&ts_st->amux->pb);
1129 size = avio_close_dyn_buf(ts_st->amux->pb, &data);
1130 ts_st->amux->pb = NULL;
1135 if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO) {
1136 // for video and subtitle, write a single pes packet
1137 mpegts_write_pes(s, st, buf, size, pts, dts,
1138 pkt->flags & AV_PKT_FLAG_KEY);
1143 if (ts_st->payload_size + size > ts->pes_payload_size ||
1144 (dts != AV_NOPTS_VALUE && ts_st->payload_dts != AV_NOPTS_VALUE &&
1145 av_compare_ts(dts - ts_st->payload_dts, st->time_base,
1146 s->max_delay, AV_TIME_BASE_Q) >= 0)) {
1147 if (ts_st->payload_size) {
1148 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1149 ts_st->payload_pts, ts_st->payload_dts,
1150 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1151 ts_st->payload_size = 0;
1153 if (size > ts->pes_payload_size) {
1154 mpegts_write_pes(s, st, buf, size, pts, dts,
1155 pkt->flags & AV_PKT_FLAG_KEY);
1161 if (!ts_st->payload_size) {
1162 ts_st->payload_pts = pts;
1163 ts_st->payload_dts = dts;
1164 ts_st->payload_flags = pkt->flags;
1167 memcpy(ts_st->payload + ts_st->payload_size, buf, size);
1168 ts_st->payload_size += size;
1175 static void mpegts_write_flush(AVFormatContext *s)
1179 /* flush current packets */
1180 for (i = 0; i < s->nb_streams; i++) {
1181 AVStream *st = s->streams[i];
1182 MpegTSWriteStream *ts_st = st->priv_data;
1183 if (ts_st->payload_size > 0) {
1184 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1185 ts_st->payload_pts, ts_st->payload_dts,
1186 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1187 ts_st->payload_size = 0;
1193 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
1196 mpegts_write_flush(s);
1199 return mpegts_write_packet_internal(s, pkt);
1203 static int mpegts_write_end(AVFormatContext *s)
1205 MpegTSWrite *ts = s->priv_data;
1206 MpegTSService *service;
1210 mpegts_write_flush(s);
1212 for (i = 0; i < s->nb_streams; i++) {
1213 AVStream *st = s->streams[i];
1214 MpegTSWriteStream *ts_st = st->priv_data;
1215 av_freep(&ts_st->payload);
1217 avformat_free_context(ts_st->amux);
1222 for (i = 0; i < ts->nb_services; i++) {
1223 service = ts->services[i];
1224 av_freep(&service->provider_name);
1225 av_freep(&service->name);
1228 av_free(ts->services);
1233 static const AVOption options[] = {
1234 { "mpegts_transport_stream_id", "Set transport_stream_id field.",
1235 offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT,
1236 { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },
1237 { "mpegts_original_network_id", "Set original_network_id field.",
1238 offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT,
1239 { .i64 = DVB_PRIVATE_NETWORK_START }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },
1240 { "mpegts_service_id", "Set service_id field.",
1241 offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT,
1242 { .i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM },
1243 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
1244 offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT,
1245 { .i64 = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM },
1246 { "mpegts_start_pid", "Set the first pid.",
1247 offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT,
1248 { .i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM },
1249 {"mpegts_m2ts_mode", "Enable m2ts mode.",
1250 offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT,
1251 { .i64 = -1 }, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},
1253 offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT,
1254 { .i64 = 1 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1255 { "pes_payload_size", "Minimum PES packet payload in bytes",
1256 offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT,
1257 { .i64 = DEFAULT_PES_PAYLOAD_SIZE }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1258 { "mpegts_flags", "MPEG-TS muxing flags",
1259 offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, { .i64 = 0 }, 0, INT_MAX,
1260 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1261 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
1262 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_REEMIT_PAT_PMT }, 0, INT_MAX,
1263 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1264 { "latm", "Use LATM packetization for AAC",
1265 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_AAC_LATM }, 0, INT_MAX,
1266 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1267 { "system_b", "Conform to System B (DVB) instead of System A (ATSC)",
1268 0, AV_OPT_TYPE_CONST, { .i64 = MPEGTS_FLAG_SYSTEM_B }, 0, INT_MAX,
1269 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
1270 // backward compatibility
1271 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
1272 offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT,
1273 { .i64 = 0 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1274 { "pcr_period", "PCR retransmission time",
1275 offsetof(MpegTSWrite, pcr_period), AV_OPT_TYPE_INT,
1276 { .i64 = PCR_RETRANS_TIME }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
1280 static const AVClass mpegts_muxer_class = {
1281 .class_name = "MPEGTS muxer",
1282 .item_name = av_default_item_name,
1284 .version = LIBAVUTIL_VERSION_INT,
1287 AVOutputFormat ff_mpegts_muxer = {
1289 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
1290 .mime_type = "video/MP2T",
1291 .extensions = "ts,m2t,m2ts,mts",
1292 .priv_data_size = sizeof(MpegTSWrite),
1293 .audio_codec = AV_CODEC_ID_MP2,
1294 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1295 .write_header = mpegts_write_header,
1296 .write_packet = mpegts_write_packet,
1297 .write_trailer = mpegts_write_end,
1298 .flags = AVFMT_ALLOW_FLUSH | AVFMT_VARIABLE_FPS,
1299 .priv_class = &mpegts_muxer_class,