2 * MPEG2 transport stream (aka DVB) muxer
3 * Copyright (c) 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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"
28 #include "libavutil/avassert.h"
29 #include "libavcodec/internal.h"
34 #define PCR_TIME_BASE 27000000
36 /* write DVB SI sections */
38 /*********************************************/
39 /* mpegts section writer */
41 typedef struct MpegTSSection {
44 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
48 typedef struct MpegTSService {
49 MpegTSSection pmt; /* MPEG2 pmt table context */
50 int sid; /* service ID */
55 int pcr_packet_period;
58 typedef struct MpegTSWrite {
59 const AVClass *av_class;
60 MpegTSSection pat; /* MPEG2 pat table */
61 MpegTSSection sdt; /* MPEG2 sdt table context */
62 MpegTSService **services;
64 int sdt_packet_period;
66 int pat_packet_period;
71 int mux_rate; ///< set to 1 when VBR
74 int transport_stream_id;
75 int original_network_id;
82 int reemit_pat_pmt; // backward compatibility
84 #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
85 #define MPEGTS_FLAG_AAC_LATM 0x02
91 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
92 #define DEFAULT_PES_HEADER_FREQ 16
93 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
95 static const AVOption options[] = {
96 { "mpegts_transport_stream_id", "Set transport_stream_id field.",
97 offsetof(MpegTSWrite, transport_stream_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
98 { "mpegts_original_network_id", "Set original_network_id field.",
99 offsetof(MpegTSWrite, original_network_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
100 { "mpegts_service_id", "Set service_id field.",
101 offsetof(MpegTSWrite, service_id), AV_OPT_TYPE_INT, {.i64 = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
102 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
103 offsetof(MpegTSWrite, pmt_start_pid), AV_OPT_TYPE_INT, {.i64 = 0x1000 }, 0x0010, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
104 { "mpegts_start_pid", "Set the first pid.",
105 offsetof(MpegTSWrite, start_pid), AV_OPT_TYPE_INT, {.i64 = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
106 {"mpegts_m2ts_mode", "Enable m2ts mode.",
107 offsetof(MpegTSWrite, m2ts_mode), AV_OPT_TYPE_INT, {.i64 = -1 },
108 -1,1, AV_OPT_FLAG_ENCODING_PARAM},
109 { "muxrate", NULL, offsetof(MpegTSWrite, mux_rate), AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
110 { "pes_payload_size", "Minimum PES packet payload in bytes",
111 offsetof(MpegTSWrite, pes_payload_size), AV_OPT_TYPE_INT, {.i64 = DEFAULT_PES_PAYLOAD_SIZE}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
112 { "mpegts_flags", "MPEG-TS muxing flags", offsetof(MpegTSWrite, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX,
113 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags" },
114 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
115 0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_REEMIT_PAT_PMT}, 0, INT_MAX,
116 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
117 { "latm", "Use LATM packetization for AAC",
118 0, AV_OPT_TYPE_CONST, {.i64 = MPEGTS_FLAG_AAC_LATM}, 0, INT_MAX,
119 AV_OPT_FLAG_ENCODING_PARAM, "mpegts_flags"},
120 // backward compatibility
121 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
122 offsetof(MpegTSWrite, reemit_pat_pmt), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
123 { "mpegts_copyts", "don't offset dts/pts",
124 offsetof(MpegTSWrite, copyts), AV_OPT_TYPE_INT, {.i64=-1}, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},
125 { "tables_version", "set PAT, PMT and SDT version",
126 offsetof(MpegTSWrite, tables_version), AV_OPT_TYPE_INT, {.i64=0}, 0, 31, AV_OPT_FLAG_ENCODING_PARAM},
130 static const AVClass mpegts_muxer_class = {
131 .class_name = "MPEGTS muxer",
132 .item_name = av_default_item_name,
134 .version = LIBAVUTIL_VERSION_INT,
137 /* NOTE: 4 bytes must be left at the end for the crc32 */
138 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
141 unsigned char packet[TS_PACKET_SIZE];
142 const unsigned char *buf_ptr;
144 int first, b, len1, left;
146 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
147 buf[len - 4] = (crc >> 24) & 0xff;
148 buf[len - 3] = (crc >> 16) & 0xff;
149 buf[len - 2] = (crc >> 8) & 0xff;
150 buf[len - 1] = (crc) & 0xff;
152 /* send each packet */
155 first = (buf == buf_ptr);
163 s->cc = (s->cc + 1) & 0xf;
166 *q++ = 0; /* 0 offset */
167 len1 = TS_PACKET_SIZE - (q - packet);
170 memcpy(q, buf_ptr, len1);
172 /* add known padding data */
173 left = TS_PACKET_SIZE - (q - packet);
175 memset(q, 0xff, left);
177 s->write_packet(s, packet);
184 static inline void put16(uint8_t **q_ptr, int val)
193 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
194 int version, int sec_num, int last_sec_num,
195 uint8_t *buf, int len)
197 uint8_t section[1024], *q;
198 unsigned int tot_len;
199 /* reserved_future_use field must be set to 1 for SDT */
200 unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
202 tot_len = 3 + 5 + len + 4;
203 /* check if not too big */
205 return AVERROR_INVALIDDATA;
209 put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
211 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
216 mpegts_write_section(s, section, tot_len);
220 /*********************************************/
223 #define DEFAULT_PROVIDER_NAME "FFmpeg"
224 #define DEFAULT_SERVICE_NAME "Service01"
226 /* we retransmit the SI info at this rate */
227 #define SDT_RETRANS_TIME 500
228 #define PAT_RETRANS_TIME 100
229 #define PCR_RETRANS_TIME 20
231 typedef struct MpegTSWriteStream {
232 struct MpegTSService *service;
233 int pid; /* stream associated pid */
236 int first_pts_check; ///< first pts check needed
237 int prev_payload_key;
242 AVFormatContext *amux;
245 static void mpegts_write_pat(AVFormatContext *s)
247 MpegTSWrite *ts = s->priv_data;
248 MpegTSService *service;
249 uint8_t data[1012], *q;
253 for(i = 0; i < ts->nb_services; i++) {
254 service = ts->services[i];
255 put16(&q, service->sid);
256 put16(&q, 0xe000 | service->pmt.pid);
258 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, ts->tables_version, 0, 0,
262 static int mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
264 MpegTSWrite *ts = s->priv_data;
265 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
266 int val, stream_type, i;
269 put16(&q, 0xe000 | service->pcr_pid);
271 program_info_length_ptr = q;
272 q += 2; /* patched after */
274 /* put program info here */
276 val = 0xf000 | (q - program_info_length_ptr - 2);
277 program_info_length_ptr[0] = val >> 8;
278 program_info_length_ptr[1] = val;
280 for(i = 0; i < s->nb_streams; i++) {
281 AVStream *st = s->streams[i];
282 MpegTSWriteStream *ts_st = st->priv_data;
283 AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);
284 switch(st->codec->codec_id) {
285 case AV_CODEC_ID_MPEG1VIDEO:
286 case AV_CODEC_ID_MPEG2VIDEO:
287 stream_type = STREAM_TYPE_VIDEO_MPEG2;
289 case AV_CODEC_ID_MPEG4:
290 stream_type = STREAM_TYPE_VIDEO_MPEG4;
292 case AV_CODEC_ID_H264:
293 stream_type = STREAM_TYPE_VIDEO_H264;
295 case AV_CODEC_ID_CAVS:
296 stream_type = STREAM_TYPE_VIDEO_CAVS;
298 case AV_CODEC_ID_DIRAC:
299 stream_type = STREAM_TYPE_VIDEO_DIRAC;
301 case AV_CODEC_ID_MP2:
302 case AV_CODEC_ID_MP3:
303 stream_type = STREAM_TYPE_AUDIO_MPEG1;
305 case AV_CODEC_ID_AAC:
306 stream_type = (ts->flags & MPEGTS_FLAG_AAC_LATM) ? STREAM_TYPE_AUDIO_AAC_LATM : STREAM_TYPE_AUDIO_AAC;
308 case AV_CODEC_ID_AAC_LATM:
309 stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
311 case AV_CODEC_ID_AC3:
312 stream_type = STREAM_TYPE_AUDIO_AC3;
315 stream_type = STREAM_TYPE_PRIVATE_DATA;
319 if (q - data > sizeof(data) - 32)
320 return AVERROR(EINVAL);
323 put16(&q, 0xe000 | ts_st->pid);
325 q += 2; /* patched after */
327 /* write optional descriptors here */
328 switch(st->codec->codec_type) {
329 case AVMEDIA_TYPE_AUDIO:
330 if(st->codec->codec_id==AV_CODEC_ID_EAC3){
331 *q++=0x7a; // EAC3 descriptor see A038 DVB SI
332 *q++=1; // 1 byte, all flags sets to 0
333 *q++=0; // omit all fields...
335 if(st->codec->codec_id==AV_CODEC_ID_S302M){
336 *q++ = 0x05; /* MPEG-2 registration descriptor*/
346 char *next = lang->value;
349 *q++ = 0x0a; /* ISO 639 language descriptor */
353 for (p = lang->value; next && *len_ptr < 255 / 4 * 4 && q - data < sizeof(data) - 4; p = next + 1) {
354 next = strchr(p, ',');
355 if (strlen(p) != 3 && (!next || next != p + 3))
356 continue; /* not a 3-letter code */
362 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
364 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
366 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
369 *q++ = 0; /* undefined type */
375 q -= 2; /* no language codes were written */
378 case AVMEDIA_TYPE_SUBTITLE:
380 const char default_language[] = "und";
381 const char *language = lang && strlen(lang->value) >= 3 ? lang->value : default_language;
383 if (st->codec->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
385 int extradata_copied = 0;
387 *q++ = 0x59; /* subtitling_descriptor */
390 while (strlen(language) >= 3 && (sizeof(data) - (q - data)) >= 8) { /* 8 bytes per DVB subtitle substream data */
395 if (*language != '\0')
398 if (st->codec->extradata_size - extradata_copied >= 5) {
399 *q++ = st->codec->extradata[extradata_copied + 4]; /* subtitling_type */
400 memcpy(q, st->codec->extradata + extradata_copied, 4); /* composition_page_id and ancillary_page_id */
401 extradata_copied += 5;
405 * 0x10 - normal with no monitor aspect ratio criticality
406 * 0x20 - for the hard of hearing with no monitor aspect ratio criticality */
407 *q++ = (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED) ? 0x20 : 0x10;
408 if ((st->codec->extradata_size == 4) && (extradata_copied == 0)) {
409 /* support of old 4-byte extradata format */
410 memcpy(q, st->codec->extradata, 4); /* composition_page_id and ancillary_page_id */
411 extradata_copied += 4;
414 put16(&q, 1); /* composition_page_id */
415 put16(&q, 1); /* ancillary_page_id */
420 *len_ptr = q - len_ptr - 1;
421 } else if (st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
422 uint8_t *len_ptr = NULL;
423 int extradata_copied = 0;
425 /* The descriptor tag. teletext_descriptor */
429 while (strlen(language) >= 3 && q - data < sizeof(data) - 6) {
434 if (*language != '\0')
437 if (st->codec->extradata_size - 1 > extradata_copied) {
438 memcpy(q, st->codec->extradata + extradata_copied, 2);
439 extradata_copied += 2;
442 /* The Teletext descriptor:
443 * teletext_type: This 5-bit field indicates the type of Teletext page indicated. (0x01 Initial Teletext page)
444 * teletext_magazine_number: This is a 3-bit field which identifies the magazine number.
445 * teletext_page_number: This is an 8-bit field giving two 4-bit hex digits identifying the page number. */
451 *len_ptr = q - len_ptr - 1;
455 case AVMEDIA_TYPE_VIDEO:
456 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
457 *q++ = 0x05; /*MPEG-2 registration descriptor*/
465 case AVMEDIA_TYPE_DATA:
466 if (st->codec->codec_id == AV_CODEC_ID_SMPTE_KLV) {
467 *q++ = 0x05; /* MPEG-2 registration descriptor */
477 val = 0xf000 | (q - desc_length_ptr - 2);
478 desc_length_ptr[0] = val >> 8;
479 desc_length_ptr[1] = val;
481 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, ts->tables_version, 0, 0,
486 /* NOTE: str == NULL is accepted for an empty string */
487 static void putstr8(uint8_t **q_ptr, const char *str)
503 static void mpegts_write_sdt(AVFormatContext *s)
505 MpegTSWrite *ts = s->priv_data;
506 MpegTSService *service;
507 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
508 int i, running_status, free_ca_mode, val;
513 for(i = 0; i < ts->nb_services; i++) {
514 service = ts->services[i];
515 put16(&q, service->sid);
516 *q++ = 0xfc | 0x00; /* currently no EIT info */
517 desc_list_len_ptr = q;
519 running_status = 4; /* running */
522 /* write only one descriptor for the service name and provider */
526 *q++ = 0x01; /* digital television service */
527 putstr8(&q, service->provider_name);
528 putstr8(&q, service->name);
529 desc_len_ptr[0] = q - desc_len_ptr - 1;
531 /* fill descriptor length */
532 val = (running_status << 13) | (free_ca_mode << 12) |
533 (q - desc_list_len_ptr - 2);
534 desc_list_len_ptr[0] = val >> 8;
535 desc_list_len_ptr[1] = val;
537 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, ts->tables_version, 0, 0,
541 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
543 const char *provider_name,
546 MpegTSService *service;
548 service = av_mallocz(sizeof(MpegTSService));
551 service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
553 service->provider_name = av_strdup(provider_name);
554 service->name = av_strdup(name);
555 service->pcr_pid = 0x1fff;
556 dynarray_add(&ts->services, &ts->nb_services, service);
560 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
562 return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
566 static void mpegts_prefix_m2ts_header(AVFormatContext *s)
568 MpegTSWrite *ts = s->priv_data;
570 int64_t pcr = get_pcr(s->priv_data, s->pb);
571 uint32_t tp_extra_header = pcr % 0x3fffffff;
572 tp_extra_header = AV_RB32(&tp_extra_header);
573 avio_write(s->pb, (unsigned char *) &tp_extra_header,
574 sizeof(tp_extra_header));
578 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
580 AVFormatContext *ctx = s->opaque;
581 mpegts_prefix_m2ts_header(ctx);
582 avio_write(ctx->pb, packet, TS_PACKET_SIZE);
585 static int mpegts_write_header(AVFormatContext *s)
587 MpegTSWrite *ts = s->priv_data;
588 MpegTSWriteStream *ts_st;
589 MpegTSService *service;
590 AVStream *st, *pcr_st = NULL;
591 AVDictionaryEntry *title, *provider;
593 const char *service_name;
594 const char *provider_name;
598 if (s->max_delay < 0) /* Not set by the caller */
601 // round up to a whole number of TS packets
602 ts->pes_payload_size = (ts->pes_payload_size + 14 + 183) / 184 * 184 - 14;
604 ts->tsid = ts->transport_stream_id;
605 ts->onid = ts->original_network_id;
606 /* allocate a single DVB service */
607 title = av_dict_get(s->metadata, "service_name", NULL, 0);
609 title = av_dict_get(s->metadata, "title", NULL, 0);
610 service_name = title ? title->value : DEFAULT_SERVICE_NAME;
611 provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
612 provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
613 service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
614 service->pmt.write_packet = section_write_packet;
615 service->pmt.opaque = s;
616 service->pmt.cc = 15;
618 ts->pat.pid = PAT_PID;
619 ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
620 ts->pat.write_packet = section_write_packet;
623 ts->sdt.pid = SDT_PID;
625 ts->sdt.write_packet = section_write_packet;
628 pids = av_malloc(s->nb_streams * sizeof(*pids));
630 return AVERROR(ENOMEM);
632 /* assign pids to each stream */
633 for(i = 0;i < s->nb_streams; i++) {
635 avpriv_set_pts_info(st, 33, 1, 90000);
636 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
638 ret = AVERROR(ENOMEM);
641 st->priv_data = ts_st;
642 ts_st->payload = av_mallocz(ts->pes_payload_size);
643 if (!ts_st->payload) {
644 ret = AVERROR(ENOMEM);
647 ts_st->service = service;
648 /* MPEG pid values < 16 are reserved. Applications which set st->id in
649 * this range are assigned a calculated pid. */
651 ts_st->pid = ts->start_pid + i;
652 } else if (st->id < 0x1FFF) {
655 av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
656 ret = AVERROR(EINVAL);
659 if (ts_st->pid == service->pmt.pid) {
660 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
661 ret = AVERROR(EINVAL);
664 for (j = 0; j < i; j++)
665 if (pids[j] == ts_st->pid) {
666 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
667 ret = AVERROR(EINVAL);
670 pids[i] = ts_st->pid;
671 ts_st->payload_pts = AV_NOPTS_VALUE;
672 ts_st->payload_dts = AV_NOPTS_VALUE;
673 ts_st->first_pts_check = 1;
675 /* update PCR pid by using the first video stream */
676 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
677 service->pcr_pid == 0x1fff) {
678 service->pcr_pid = ts_st->pid;
681 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
682 st->codec->extradata_size > 0)
685 ts_st->amux = avformat_alloc_context();
687 ret = AVERROR(ENOMEM);
690 ts_st->amux->oformat = av_guess_format((ts->flags & MPEGTS_FLAG_AAC_LATM) ? "latm" : "adts", NULL, NULL);
691 if (!ts_st->amux->oformat) {
692 ret = AVERROR(EINVAL);
695 ast = avformat_new_stream(ts_st->amux, NULL);
696 ret = avcodec_copy_context(ast->codec, st->codec);
699 ret = avformat_write_header(ts_st->amux, NULL);
707 /* if no video stream, use the first stream as PCR */
708 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
709 pcr_st = s->streams[0];
710 ts_st = pcr_st->priv_data;
711 service->pcr_pid = ts_st->pid;
714 if (ts->mux_rate > 1) {
715 service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
716 (TS_PACKET_SIZE * 8 * 1000);
717 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
718 (TS_PACKET_SIZE * 8 * 1000);
719 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
720 (TS_PACKET_SIZE * 8 * 1000);
723 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
725 /* Arbitrary values, PAT/PMT will also be written on video key frames */
726 ts->sdt_packet_period = 200;
727 ts->pat_packet_period = 40;
728 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
729 if (!pcr_st->codec->frame_size) {
730 av_log(s, AV_LOG_WARNING, "frame size not set\n");
731 service->pcr_packet_period =
732 pcr_st->codec->sample_rate/(10*512);
734 service->pcr_packet_period =
735 pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
738 // max delta PCR 0.1s
739 service->pcr_packet_period =
740 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
742 if(!service->pcr_packet_period)
743 service->pcr_packet_period = 1;
746 // output a PCR as soon as possible
747 service->pcr_packet_count = service->pcr_packet_period;
748 ts->pat_packet_count = ts->pat_packet_period-1;
749 ts->sdt_packet_count = ts->sdt_packet_period-1;
751 if (ts->mux_rate == 1)
752 av_log(s, AV_LOG_VERBOSE, "muxrate VBR, ");
754 av_log(s, AV_LOG_VERBOSE, "muxrate %d, ", ts->mux_rate);
755 av_log(s, AV_LOG_VERBOSE, "pcr every %d pkts, "
756 "sdt every %d, pat/pmt every %d pkts\n",
757 service->pcr_packet_period,
758 ts->sdt_packet_period, ts->pat_packet_period);
760 if (ts->m2ts_mode == -1) {
761 if (av_match_ext(s->filename, "m2ts")) {
774 for(i = 0;i < s->nb_streams; i++) {
775 MpegTSWriteStream *ts_st;
777 ts_st = st->priv_data;
779 av_freep(&ts_st->payload);
781 avformat_free_context(ts_st->amux);
785 av_freep(&st->priv_data);
790 /* send SDT, PAT and PMT tables regulary */
791 static void retransmit_si_info(AVFormatContext *s, int force_pat)
793 MpegTSWrite *ts = s->priv_data;
796 if (++ts->sdt_packet_count == ts->sdt_packet_period) {
797 ts->sdt_packet_count = 0;
800 if (++ts->pat_packet_count == ts->pat_packet_period || force_pat) {
801 ts->pat_packet_count = 0;
803 for(i = 0; i < ts->nb_services; i++) {
804 mpegts_write_pmt(s, ts->services[i]);
809 static int write_pcr_bits(uint8_t *buf, int64_t pcr)
811 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
813 *buf++ = pcr_high >> 25;
814 *buf++ = pcr_high >> 17;
815 *buf++ = pcr_high >> 9;
816 *buf++ = pcr_high >> 1;
817 *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
823 /* Write a single null transport stream packet */
824 static void mpegts_insert_null_packet(AVFormatContext *s)
827 uint8_t buf[TS_PACKET_SIZE];
834 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
835 mpegts_prefix_m2ts_header(s);
836 avio_write(s->pb, buf, TS_PACKET_SIZE);
839 /* Write a single transport stream packet with a PCR and no payload */
840 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
842 MpegTSWrite *ts = s->priv_data;
843 MpegTSWriteStream *ts_st = st->priv_data;
845 uint8_t buf[TS_PACKET_SIZE];
849 *q++ = ts_st->pid >> 8;
851 *q++ = 0x20 | ts_st->cc; /* Adaptation only */
852 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
853 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
854 *q++ = 0x10; /* Adaptation flags: PCR present */
856 /* PCR coded into 6 bytes */
857 q += write_pcr_bits(q, get_pcr(ts, s->pb));
860 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
861 mpegts_prefix_m2ts_header(s);
862 avio_write(s->pb, buf, TS_PACKET_SIZE);
865 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
869 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
871 val = (((pts >> 15) & 0x7fff) << 1) | 1;
874 val = (((pts) & 0x7fff) << 1) | 1;
879 /* Set an adaptation field flag in an MPEG-TS packet*/
880 static void set_af_flag(uint8_t *pkt, int flag)
882 // expect at least one flag to set
885 if ((pkt[3] & 0x20) == 0) {
886 // no AF yet, set adaptation field flag
888 // 1 byte length, no flags
895 /* Extend the adaptation field by size bytes */
896 static void extend_af(uint8_t *pkt, int size)
898 // expect already existing adaptation field
899 av_assert0(pkt[3] & 0x20);
903 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
904 static uint8_t *get_ts_payload_start(uint8_t *pkt)
907 return pkt + 5 + pkt[4];
912 /* Add a pes header to the front of payload, and segment into an integer number of
913 * ts packets. The final ts packet is padded using an over-sized adaptation header
914 * to exactly fill the last ts packet.
915 * NOTE: 'payload' contains a complete PES payload.
917 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
918 const uint8_t *payload, int payload_size,
919 int64_t pts, int64_t dts, int key)
921 MpegTSWriteStream *ts_st = st->priv_data;
922 MpegTSWrite *ts = s->priv_data;
923 uint8_t buf[TS_PACKET_SIZE];
925 int val, is_start, len, header_len, write_pcr, is_dvb_subtitle, is_dvb_teletext, flags;
926 int afc_len, stuffing_len;
927 int64_t pcr = -1; /* avoid warning */
928 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
929 int force_pat = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && key && !ts_st->prev_payload_key;
932 while (payload_size > 0) {
933 retransmit_si_info(s, force_pat);
937 if (ts_st->pid == ts_st->service->pcr_pid) {
938 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
939 ts_st->service->pcr_packet_count++;
940 if (ts_st->service->pcr_packet_count >=
941 ts_st->service->pcr_packet_period) {
942 ts_st->service->pcr_packet_count = 0;
947 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
948 (dts - get_pcr(ts, s->pb)/300) > delay) {
949 /* pcr insert gets priority over null packet insert */
951 mpegts_insert_pcr_only(s, st);
953 mpegts_insert_null_packet(s);
954 continue; /* recalculate write_pcr and possibly retransmit si_info */
957 /* prepare packet header */
960 val = (ts_st->pid >> 8);
965 ts_st->cc = (ts_st->cc + 1) & 0xf;
966 *q++ = 0x10 | ts_st->cc; // payload indicator + CC
967 if (key && is_start && pts != AV_NOPTS_VALUE) {
968 // set Random Access for key frames
969 if (ts_st->pid == ts_st->service->pcr_pid)
971 set_af_flag(buf, 0x40);
972 q = get_ts_payload_start(buf);
975 set_af_flag(buf, 0x10);
976 q = get_ts_payload_start(buf);
977 // add 11, pcr references the last byte of program clock reference base
978 if (ts->mux_rate > 1)
979 pcr = get_pcr(ts, s->pb);
981 pcr = (dts - delay)*300;
982 if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
983 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
984 extend_af(buf, write_pcr_bits(q, pcr));
985 q = get_ts_payload_start(buf);
988 int pes_extension = 0;
989 int pes_header_stuffing_bytes = 0;
990 /* write PES header */
996 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
997 if (st->codec->codec_id == AV_CODEC_ID_DIRAC) {
1001 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
1002 (st->codec->codec_id == AV_CODEC_ID_MP2 ||
1003 st->codec->codec_id == AV_CODEC_ID_MP3 ||
1004 st->codec->codec_id == AV_CODEC_ID_AAC)) {
1006 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
1007 st->codec->codec_id == AV_CODEC_ID_AC3 &&
1012 if(st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
1013 if (st->codec->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
1014 is_dvb_subtitle = 1;
1015 } else if (st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1016 is_dvb_teletext = 1;
1022 if (pts != AV_NOPTS_VALUE) {
1026 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
1030 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
1031 st->codec->codec_id == AV_CODEC_ID_DIRAC) {
1032 /* set PES_extension_flag */
1037 * One byte for PES2 extension flag +
1038 * one byte for extension length +
1039 * one byte for extension id
1043 /* for Blu-ray AC3 Audio the PES Extension flag should be as follow
1044 * otherwise it will not play sound on blu-ray
1046 if (ts->m2ts_mode &&
1047 st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
1048 st->codec->codec_id == AV_CODEC_ID_AC3) {
1049 /* set PES_extension_flag */
1054 if (is_dvb_teletext) {
1055 pes_header_stuffing_bytes = 0x24 - header_len;
1058 len = payload_size + header_len + 3;
1059 /* 3 extra bytes should be added to DVB subtitle payload: 0x20 0x00 at the beginning and trailing 0xff */
1060 if (is_dvb_subtitle) {
1069 /* data alignment indicator is required for subtitle and data streams */
1070 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE || st->codec->codec_type == AVMEDIA_TYPE_DATA)
1075 if (pts != AV_NOPTS_VALUE) {
1076 write_pts(q, flags >> 6, pts);
1079 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
1080 write_pts(q, 1, dts);
1083 if (pes_extension && st->codec->codec_id == AV_CODEC_ID_DIRAC) {
1084 flags = 0x01; /* set PES_extension_flag_2 */
1086 *q++ = 0x80 | 0x01; /* marker bit + extension length */
1088 * Set the stream id extension flag bit to 0 and
1089 * write the extended stream id
1093 /* For Blu-ray AC3 Audio Setting extended flags */
1094 if (ts->m2ts_mode &&
1096 st->codec->codec_id == AV_CODEC_ID_AC3) {
1097 flags = 0x01; /* set PES_extension_flag_2 */
1099 *q++ = 0x80 | 0x01; /* marker bit + extension length */
1100 *q++ = 0x00 | 0x71; /* for AC3 Audio (specifically on blue-rays) */
1104 if (is_dvb_subtitle) {
1105 /* First two fields of DVB subtitles PES data:
1106 * data_identifier: for DVB subtitle streams shall be coded with the value 0x20
1107 * subtitle_stream_id: for DVB subtitle stream shall be identified by the value 0x00 */
1111 if (is_dvb_teletext) {
1112 memset(q, 0xff, pes_header_stuffing_bytes);
1113 q += pes_header_stuffing_bytes;
1118 header_len = q - buf;
1120 len = TS_PACKET_SIZE - header_len;
1121 if (len > payload_size)
1123 stuffing_len = TS_PACKET_SIZE - header_len - len;
1124 if (stuffing_len > 0) {
1125 /* add stuffing with AFC */
1126 if (buf[3] & 0x20) {
1127 /* stuffing already present: increase its size */
1128 afc_len = buf[4] + 1;
1129 memmove(buf + 4 + afc_len + stuffing_len,
1131 header_len - (4 + afc_len));
1132 buf[4] += stuffing_len;
1133 memset(buf + 4 + afc_len, 0xff, stuffing_len);
1136 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
1138 buf[4] = stuffing_len - 1;
1139 if (stuffing_len >= 2) {
1141 memset(buf + 6, 0xff, stuffing_len - 2);
1146 if (is_dvb_subtitle && payload_size == len) {
1147 memcpy(buf + TS_PACKET_SIZE - len, payload, len - 1);
1148 buf[TS_PACKET_SIZE - 1] = 0xff; /* end_of_PES_data_field_marker: an 8-bit field with fixed contents 0xff for DVB subtitle */
1150 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
1154 payload_size -= len;
1155 mpegts_prefix_m2ts_header(s);
1156 avio_write(s->pb, buf, TS_PACKET_SIZE);
1159 ts_st->prev_payload_key = key;
1162 static int mpegts_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
1164 AVStream *st = s->streams[pkt->stream_index];
1165 int size = pkt->size;
1166 uint8_t *buf= pkt->data;
1167 uint8_t *data= NULL;
1168 MpegTSWrite *ts = s->priv_data;
1169 MpegTSWriteStream *ts_st = st->priv_data;
1170 const int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
1171 int64_t dts = pkt->dts, pts = pkt->pts;
1173 if (ts->reemit_pat_pmt) {
1174 av_log(s, AV_LOG_WARNING, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");
1175 ts->reemit_pat_pmt = 0;
1176 ts->flags |= MPEGTS_FLAG_REEMIT_PAT_PMT;
1179 if (ts->flags & MPEGTS_FLAG_REEMIT_PAT_PMT) {
1180 ts->pat_packet_count = ts->pat_packet_period - 1;
1181 ts->sdt_packet_count = ts->sdt_packet_period - 1;
1182 ts->flags &= ~MPEGTS_FLAG_REEMIT_PAT_PMT;
1186 if (pts != AV_NOPTS_VALUE)
1188 if (dts != AV_NOPTS_VALUE)
1192 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
1193 av_log(s, AV_LOG_ERROR, "first pts value must be set\n");
1194 return AVERROR_INVALIDDATA;
1196 ts_st->first_pts_check = 0;
1198 if (st->codec->codec_id == AV_CODEC_ID_H264) {
1199 const uint8_t *p = buf, *buf_end = p+size;
1200 uint32_t state = -1;
1202 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
1203 if (!st->nb_frames) {
1204 av_log(s, AV_LOG_ERROR, "H.264 bitstream malformed, "
1205 "no startcode found, use the h264_mp4toannexb bitstream filter (-bsf h264_mp4toannexb)\n");
1206 return AVERROR(EINVAL);
1208 av_log(s, AV_LOG_WARNING, "H.264 bitstream error, startcode missing\n");
1212 p = avpriv_find_start_code(p, buf_end, &state);
1213 av_dlog(s, "nal %d\n", state & 0x1f);
1214 } while (p < buf_end && (state & 0x1f) != 9 &&
1215 (state & 0x1f) != 5 && (state & 0x1f) != 1);
1217 if ((state & 0x1f) != 9) { // AUD NAL
1218 data = av_malloc(pkt->size+6);
1220 return AVERROR(ENOMEM);
1221 memcpy(data+6, pkt->data, pkt->size);
1222 AV_WB32(data, 0x00000001);
1224 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
1228 } else if (st->codec->codec_id == AV_CODEC_ID_AAC) {
1229 if (pkt->size < 2) {
1230 av_log(s, AV_LOG_ERROR, "AAC packet too short\n");
1231 return AVERROR_INVALIDDATA;
1233 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
1238 av_log(s, AV_LOG_ERROR, "AAC bitstream not in ADTS format "
1239 "and extradata missing\n");
1240 return AVERROR_INVALIDDATA;
1243 av_init_packet(&pkt2);
1244 pkt2.data = pkt->data;
1245 pkt2.size = pkt->size;
1246 ret = avio_open_dyn_buf(&ts_st->amux->pb);
1248 return AVERROR(ENOMEM);
1250 ret = av_write_frame(ts_st->amux, &pkt2);
1252 avio_close_dyn_buf(ts_st->amux->pb, &data);
1253 ts_st->amux->pb = NULL;
1257 size = avio_close_dyn_buf(ts_st->amux->pb, &data);
1258 ts_st->amux->pb = NULL;
1263 if (pkt->dts != AV_NOPTS_VALUE) {
1265 for(i=0; i<s->nb_streams; i++){
1266 AVStream *st2 = s->streams[i];
1267 MpegTSWriteStream *ts_st2 = st2->priv_data;
1268 if( ts_st2->payload_size
1269 && (ts_st2->payload_dts == AV_NOPTS_VALUE || dts - ts_st2->payload_dts > delay/2)){
1270 mpegts_write_pes(s, st2, ts_st2->payload, ts_st2->payload_size,
1271 ts_st2->payload_pts, ts_st2->payload_dts,
1272 ts_st2->payload_flags & AV_PKT_FLAG_KEY);
1273 ts_st2->payload_size = 0;
1278 if (ts_st->payload_size && ts_st->payload_size + size > ts->pes_payload_size) {
1279 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1280 ts_st->payload_pts, ts_st->payload_dts,
1281 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1282 ts_st->payload_size = 0;
1285 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO || size > ts->pes_payload_size) {
1286 av_assert0(!ts_st->payload_size);
1287 // for video and subtitle, write a single pes packet
1288 mpegts_write_pes(s, st, buf, size, pts, dts, pkt->flags & AV_PKT_FLAG_KEY);
1293 if (!ts_st->payload_size) {
1294 ts_st->payload_pts = pts;
1295 ts_st->payload_dts = dts;
1296 ts_st->payload_flags = pkt->flags;
1299 memcpy(ts_st->payload + ts_st->payload_size, buf, size);
1300 ts_st->payload_size += size;
1307 static void mpegts_write_flush(AVFormatContext *s)
1311 /* flush current packets */
1312 for(i = 0; i < s->nb_streams; i++) {
1313 AVStream *st = s->streams[i];
1314 MpegTSWriteStream *ts_st = st->priv_data;
1315 if (ts_st->payload_size > 0) {
1316 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_size,
1317 ts_st->payload_pts, ts_st->payload_dts,
1318 ts_st->payload_flags & AV_PKT_FLAG_KEY);
1319 ts_st->payload_size = 0;
1325 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
1328 mpegts_write_flush(s);
1331 return mpegts_write_packet_internal(s, pkt);
1335 static int mpegts_write_end(AVFormatContext *s)
1337 MpegTSWrite *ts = s->priv_data;
1338 MpegTSService *service;
1341 mpegts_write_flush(s);
1343 for(i = 0; i < s->nb_streams; i++) {
1344 AVStream *st = s->streams[i];
1345 MpegTSWriteStream *ts_st = st->priv_data;
1346 av_freep(&ts_st->payload);
1348 avformat_free_context(ts_st->amux);
1353 for(i = 0; i < ts->nb_services; i++) {
1354 service = ts->services[i];
1355 av_freep(&service->provider_name);
1356 av_freep(&service->name);
1359 av_free(ts->services);
1364 AVOutputFormat ff_mpegts_muxer = {
1366 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
1367 .mime_type = "video/x-mpegts",
1368 .extensions = "ts,m2t,m2ts,mts",
1369 .priv_data_size = sizeof(MpegTSWrite),
1370 .audio_codec = AV_CODEC_ID_MP2,
1371 .video_codec = AV_CODEC_ID_MPEG2VIDEO,
1372 .write_header = mpegts_write_header,
1373 .write_packet = mpegts_write_packet,
1374 .write_trailer = mpegts_write_end,
1375 .flags = AVFMT_ALLOW_FLUSH,
1376 .priv_class = &mpegts_muxer_class,