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/opt.h"
26 #include "libavcodec/mpegvideo.h"
32 #define PCR_TIME_BASE 27000000
34 /* write DVB SI sections */
36 /*********************************************/
37 /* mpegts section writer */
39 typedef struct MpegTSSection {
42 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
46 typedef struct MpegTSService {
47 MpegTSSection pmt; /* MPEG2 pmt table context */
48 int sid; /* service ID */
53 int pcr_packet_period;
56 typedef struct MpegTSWrite {
57 const AVClass *av_class;
58 MpegTSSection pat; /* MPEG2 pat table */
59 MpegTSSection sdt; /* MPEG2 sdt table context */
60 MpegTSService **services;
62 int sdt_packet_period;
64 int pat_packet_period;
69 int mux_rate; ///< set to 1 when VBR
71 int transport_stream_id;
72 int original_network_id;
79 static const AVOption options[] = {
80 { "mpegts_transport_stream_id", "Set transport_stream_id field.",
81 offsetof(MpegTSWrite, transport_stream_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
82 { "mpegts_original_network_id", "Set original_network_id field.",
83 offsetof(MpegTSWrite, original_network_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
84 { "mpegts_service_id", "Set service_id field.",
85 offsetof(MpegTSWrite, service_id), FF_OPT_TYPE_INT, {.dbl = 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
86 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
87 offsetof(MpegTSWrite, pmt_start_pid), FF_OPT_TYPE_INT, {.dbl = 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM},
88 { "mpegts_start_pid", "Set the first pid.",
89 offsetof(MpegTSWrite, start_pid), FF_OPT_TYPE_INT, {.dbl = 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM},
93 static const AVClass mpegts_muxer_class = {
94 .class_name = "MPEGTS muxer",
95 .item_name = av_default_item_name,
97 .version = LIBAVUTIL_VERSION_INT,
100 /* NOTE: 4 bytes must be left at the end for the crc32 */
101 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
104 unsigned char packet[TS_PACKET_SIZE];
105 const unsigned char *buf_ptr;
107 int first, b, len1, left;
109 crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
110 buf[len - 4] = (crc >> 24) & 0xff;
111 buf[len - 3] = (crc >> 16) & 0xff;
112 buf[len - 2] = (crc >> 8) & 0xff;
113 buf[len - 1] = (crc) & 0xff;
115 /* send each packet */
118 first = (buf == buf_ptr);
126 s->cc = (s->cc + 1) & 0xf;
129 *q++ = 0; /* 0 offset */
130 len1 = TS_PACKET_SIZE - (q - packet);
133 memcpy(q, buf_ptr, len1);
135 /* add known padding data */
136 left = TS_PACKET_SIZE - (q - packet);
138 memset(q, 0xff, left);
140 s->write_packet(s, packet);
147 static inline void put16(uint8_t **q_ptr, int val)
156 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
157 int version, int sec_num, int last_sec_num,
158 uint8_t *buf, int len)
160 uint8_t section[1024], *q;
161 unsigned int tot_len;
162 /* reserved_future_use field must be set to 1 for SDT */
163 unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000;
165 tot_len = 3 + 5 + len + 4;
166 /* check if not too big */
172 put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
174 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
179 mpegts_write_section(s, section, tot_len);
183 /*********************************************/
186 #define DEFAULT_PROVIDER_NAME "FFmpeg"
187 #define DEFAULT_SERVICE_NAME "Service01"
189 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
190 #define DEFAULT_PES_HEADER_FREQ 16
191 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
193 /* we retransmit the SI info at this rate */
194 #define SDT_RETRANS_TIME 500
195 #define PAT_RETRANS_TIME 100
196 #define PCR_RETRANS_TIME 20
198 typedef struct MpegTSWriteStream {
199 struct MpegTSService *service;
200 int pid; /* stream associated pid */
203 int first_pts_check; ///< first pts check needed
206 uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
210 static void mpegts_write_pat(AVFormatContext *s)
212 MpegTSWrite *ts = s->priv_data;
213 MpegTSService *service;
214 uint8_t data[1012], *q;
218 for(i = 0; i < ts->nb_services; i++) {
219 service = ts->services[i];
220 put16(&q, service->sid);
221 put16(&q, 0xe000 | service->pmt.pid);
223 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
227 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
229 // MpegTSWrite *ts = s->priv_data;
230 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
231 int val, stream_type, i;
234 put16(&q, 0xe000 | service->pcr_pid);
236 program_info_length_ptr = q;
237 q += 2; /* patched after */
239 /* put program info here */
241 val = 0xf000 | (q - program_info_length_ptr - 2);
242 program_info_length_ptr[0] = val >> 8;
243 program_info_length_ptr[1] = val;
245 for(i = 0; i < s->nb_streams; i++) {
246 AVStream *st = s->streams[i];
247 MpegTSWriteStream *ts_st = st->priv_data;
248 AVDictionaryEntry *lang = av_dict_get(st->metadata, "language", NULL,0);
249 switch(st->codec->codec_id) {
250 case CODEC_ID_MPEG1VIDEO:
251 case CODEC_ID_MPEG2VIDEO:
252 stream_type = STREAM_TYPE_VIDEO_MPEG2;
255 stream_type = STREAM_TYPE_VIDEO_MPEG4;
258 stream_type = STREAM_TYPE_VIDEO_H264;
261 stream_type = STREAM_TYPE_VIDEO_DIRAC;
265 stream_type = STREAM_TYPE_AUDIO_MPEG1;
268 stream_type = STREAM_TYPE_AUDIO_AAC;
270 case CODEC_ID_AAC_LATM:
271 stream_type = STREAM_TYPE_AUDIO_AAC_LATM;
274 stream_type = STREAM_TYPE_AUDIO_AC3;
277 stream_type = STREAM_TYPE_PRIVATE_DATA;
281 put16(&q, 0xe000 | ts_st->pid);
283 q += 2; /* patched after */
285 /* write optional descriptors here */
286 switch(st->codec->codec_type) {
287 case AVMEDIA_TYPE_AUDIO:
290 char *next = lang->value;
293 *q++ = 0x0a; /* ISO 639 language descriptor */
297 for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
298 next = strchr(p, ',');
299 if (strlen(p) != 3 && (!next || next != p + 3))
300 continue; /* not a 3-letter code */
306 if (st->disposition & AV_DISPOSITION_CLEAN_EFFECTS)
308 else if (st->disposition & AV_DISPOSITION_HEARING_IMPAIRED)
310 else if (st->disposition & AV_DISPOSITION_VISUAL_IMPAIRED)
313 *q++ = 0; /* undefined type */
319 q -= 2; /* no language codes were written */
322 case AVMEDIA_TYPE_SUBTITLE:
324 const char *language;
325 language = lang && strlen(lang->value)==3 ? lang->value : "eng";
331 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
332 if(st->codec->extradata_size == 4) {
333 memcpy(q, st->codec->extradata, 4);
336 put16(&q, 1); /* page id */
337 put16(&q, 1); /* ancillary page id */
341 case AVMEDIA_TYPE_VIDEO:
342 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
343 *q++ = 0x05; /*MPEG-2 registration descriptor*/
353 val = 0xf000 | (q - desc_length_ptr - 2);
354 desc_length_ptr[0] = val >> 8;
355 desc_length_ptr[1] = val;
357 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
361 /* NOTE: str == NULL is accepted for an empty string */
362 static void putstr8(uint8_t **q_ptr, const char *str)
378 static void mpegts_write_sdt(AVFormatContext *s)
380 MpegTSWrite *ts = s->priv_data;
381 MpegTSService *service;
382 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
383 int i, running_status, free_ca_mode, val;
388 for(i = 0; i < ts->nb_services; i++) {
389 service = ts->services[i];
390 put16(&q, service->sid);
391 *q++ = 0xfc | 0x00; /* currently no EIT info */
392 desc_list_len_ptr = q;
394 running_status = 4; /* running */
397 /* write only one descriptor for the service name and provider */
401 *q++ = 0x01; /* digital television service */
402 putstr8(&q, service->provider_name);
403 putstr8(&q, service->name);
404 desc_len_ptr[0] = q - desc_len_ptr - 1;
406 /* fill descriptor length */
407 val = (running_status << 13) | (free_ca_mode << 12) |
408 (q - desc_list_len_ptr - 2);
409 desc_list_len_ptr[0] = val >> 8;
410 desc_list_len_ptr[1] = val;
412 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
416 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
418 const char *provider_name,
421 MpegTSService *service;
423 service = av_mallocz(sizeof(MpegTSService));
426 service->pmt.pid = ts->pmt_start_pid + ts->nb_services;
428 service->provider_name = av_strdup(provider_name);
429 service->name = av_strdup(name);
430 service->pcr_pid = 0x1fff;
431 dynarray_add(&ts->services, &ts->nb_services, service);
435 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
437 AVFormatContext *ctx = s->opaque;
438 avio_write(ctx->pb, packet, TS_PACKET_SIZE);
441 static int mpegts_write_header(AVFormatContext *s)
443 MpegTSWrite *ts = s->priv_data;
444 MpegTSWriteStream *ts_st;
445 MpegTSService *service;
446 AVStream *st, *pcr_st = NULL;
447 AVDictionaryEntry *title, *provider;
449 const char *service_name;
450 const char *provider_name;
453 ts->tsid = ts->transport_stream_id;
454 ts->onid = ts->original_network_id;
455 /* allocate a single DVB service */
456 title = av_dict_get(s->metadata, "service_name", NULL, 0);
458 title = av_dict_get(s->metadata, "title", NULL, 0);
459 service_name = title ? title->value : DEFAULT_SERVICE_NAME;
460 provider = av_dict_get(s->metadata, "service_provider", NULL, 0);
461 provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME;
462 service = mpegts_add_service(ts, ts->service_id, provider_name, service_name);
463 service->pmt.write_packet = section_write_packet;
464 service->pmt.opaque = s;
465 service->pmt.cc = 15;
467 ts->pat.pid = PAT_PID;
468 ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
469 ts->pat.write_packet = section_write_packet;
472 ts->sdt.pid = SDT_PID;
474 ts->sdt.write_packet = section_write_packet;
477 pids = av_malloc(s->nb_streams * sizeof(*pids));
479 return AVERROR(ENOMEM);
481 /* assign pids to each stream */
482 for(i = 0;i < s->nb_streams; i++) {
484 av_set_pts_info(st, 33, 1, 90000);
485 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
488 st->priv_data = ts_st;
489 ts_st->service = service;
490 /* MPEG pid values < 16 are reserved. Applications which set st->id in
491 * this range are assigned a calculated pid. */
493 ts_st->pid = ts->start_pid + i;
494 } else if (st->id < 0x1FFF) {
497 av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
500 if (ts_st->pid == service->pmt.pid) {
501 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
504 for (j = 0; j < i; j++)
505 if (pids[j] == ts_st->pid) {
506 av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
509 pids[i] = ts_st->pid;
510 ts_st->payload_pts = AV_NOPTS_VALUE;
511 ts_st->payload_dts = AV_NOPTS_VALUE;
512 ts_st->first_pts_check = 1;
514 /* update PCR pid by using the first video stream */
515 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
516 service->pcr_pid == 0x1fff) {
517 service->pcr_pid = ts_st->pid;
520 if (st->codec->codec_id == CODEC_ID_AAC &&
521 st->codec->extradata_size > 0) {
522 ts_st->adts = av_mallocz(sizeof(*ts_st->adts));
524 return AVERROR(ENOMEM);
525 if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata,
526 st->codec->extradata_size) < 0)
533 /* if no video stream, use the first stream as PCR */
534 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
535 pcr_st = s->streams[0];
536 ts_st = pcr_st->priv_data;
537 service->pcr_pid = ts_st->pid;
540 ts->mux_rate = s->mux_rate ? s->mux_rate : 1;
542 if (ts->mux_rate > 1) {
543 service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) /
544 (TS_PACKET_SIZE * 8 * 1000);
545 ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) /
546 (TS_PACKET_SIZE * 8 * 1000);
547 ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) /
548 (TS_PACKET_SIZE * 8 * 1000);
550 ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE);
552 /* Arbitrary values, PAT/PMT could be written on key frames */
553 ts->sdt_packet_period = 200;
554 ts->pat_packet_period = 40;
555 if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
556 if (!pcr_st->codec->frame_size) {
557 av_log(s, AV_LOG_WARNING, "frame size not set\n");
558 service->pcr_packet_period =
559 pcr_st->codec->sample_rate/(10*512);
561 service->pcr_packet_period =
562 pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
565 // max delta PCR 0.1s
566 service->pcr_packet_period =
567 pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
571 // output a PCR as soon as possible
572 service->pcr_packet_count = service->pcr_packet_period;
573 ts->pat_packet_count = ts->pat_packet_period-1;
574 ts->sdt_packet_count = ts->sdt_packet_period-1;
576 if (ts->mux_rate == 1)
577 av_log(s, AV_LOG_INFO, "muxrate VBR, ");
579 av_log(s, AV_LOG_INFO, "muxrate %d, ", ts->mux_rate);
580 av_log(s, AV_LOG_INFO, "pcr every %d pkts, "
581 "sdt every %d, pat/pmt every %d pkts\n",
582 service->pcr_packet_period,
583 ts->sdt_packet_period, ts->pat_packet_period);
591 for(i = 0;i < s->nb_streams; i++) {
593 av_freep(&st->priv_data);
598 /* send SDT, PAT and PMT tables regulary */
599 static void retransmit_si_info(AVFormatContext *s)
601 MpegTSWrite *ts = s->priv_data;
604 if (++ts->sdt_packet_count == ts->sdt_packet_period) {
605 ts->sdt_packet_count = 0;
608 if (++ts->pat_packet_count == ts->pat_packet_period) {
609 ts->pat_packet_count = 0;
611 for(i = 0; i < ts->nb_services; i++) {
612 mpegts_write_pmt(s, ts->services[i]);
617 static int64_t get_pcr(const MpegTSWrite *ts, AVIOContext *pb)
619 return av_rescale(avio_tell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) +
623 static uint8_t* write_pcr_bits(uint8_t *buf, int64_t pcr)
625 int64_t pcr_low = pcr % 300, pcr_high = pcr / 300;
627 *buf++ = pcr_high >> 25;
628 *buf++ = pcr_high >> 17;
629 *buf++ = pcr_high >> 9;
630 *buf++ = pcr_high >> 1;
631 *buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e;
637 /* Write a single null transport stream packet */
638 static void mpegts_insert_null_packet(AVFormatContext *s)
641 uint8_t buf[TS_PACKET_SIZE];
648 memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
649 avio_write(s->pb, buf, TS_PACKET_SIZE);
652 /* Write a single transport stream packet with a PCR and no payload */
653 static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st)
655 MpegTSWrite *ts = s->priv_data;
656 MpegTSWriteStream *ts_st = st->priv_data;
658 uint8_t buf[TS_PACKET_SIZE];
662 *q++ = ts_st->pid >> 8;
664 *q++ = 0x20 | ts_st->cc; /* Adaptation only */
665 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
666 *q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */
667 *q++ = 0x10; /* Adaptation flags: PCR present */
669 /* PCR coded into 6 bytes */
670 q = write_pcr_bits(q, get_pcr(ts, s->pb));
673 memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
674 avio_write(s->pb, buf, TS_PACKET_SIZE);
677 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
681 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
683 val = (((pts >> 15) & 0x7fff) << 1) | 1;
686 val = (((pts) & 0x7fff) << 1) | 1;
691 /* Add a pes header to the front of payload, and segment into an integer number of
692 * ts packets. The final ts packet is padded using an over-sized adaptation header
693 * to exactly fill the last ts packet.
694 * NOTE: 'payload' contains a complete PES payload.
696 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
697 const uint8_t *payload, int payload_size,
698 int64_t pts, int64_t dts)
700 MpegTSWriteStream *ts_st = st->priv_data;
701 MpegTSWrite *ts = s->priv_data;
702 uint8_t buf[TS_PACKET_SIZE];
704 int val, is_start, len, header_len, write_pcr, private_code, flags;
705 int afc_len, stuffing_len;
706 int64_t pcr = -1; /* avoid warning */
707 int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
710 while (payload_size > 0) {
711 retransmit_si_info(s);
714 if (ts_st->pid == ts_st->service->pcr_pid) {
715 if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames
716 ts_st->service->pcr_packet_count++;
717 if (ts_st->service->pcr_packet_count >=
718 ts_st->service->pcr_packet_period) {
719 ts_st->service->pcr_packet_count = 0;
724 if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE &&
725 (dts - get_pcr(ts, s->pb)/300) > delay) {
726 /* pcr insert gets priority over null packet insert */
728 mpegts_insert_pcr_only(s, st);
730 mpegts_insert_null_packet(s);
731 continue; /* recalculate write_pcr and possibly retransmit si_info */
734 /* prepare packet header */
737 val = (ts_st->pid >> 8);
742 ts_st->cc = (ts_st->cc + 1) & 0xf;
743 *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
745 // add 11, pcr references the last byte of program clock reference base
746 if (ts->mux_rate > 1)
747 pcr = get_pcr(ts, s->pb);
749 pcr = (dts - delay)*300;
750 if (dts != AV_NOPTS_VALUE && dts < pcr / 300)
751 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
752 *q++ = 7; /* AFC length */
753 *q++ = 0x10; /* flags: PCR present */
754 q = write_pcr_bits(q, pcr);
757 int pes_extension = 0;
758 /* write PES header */
763 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
764 if (st->codec->codec_id == CODEC_ID_DIRAC) {
768 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
769 (st->codec->codec_id == CODEC_ID_MP2 ||
770 st->codec->codec_id == CODEC_ID_MP3 ||
771 st->codec->codec_id == CODEC_ID_AAC)) {
775 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
781 if (pts != AV_NOPTS_VALUE) {
785 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
789 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
790 st->codec->codec_id == CODEC_ID_DIRAC) {
791 /* set PES_extension_flag */
796 * One byte for PES2 extension flag +
797 * one byte for extension length +
798 * one byte for extension id
802 len = payload_size + header_len + 3;
803 if (private_code != 0)
810 /* data alignment indicator is required for subtitle data */
811 if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
816 if (pts != AV_NOPTS_VALUE) {
817 write_pts(q, flags >> 6, pts);
820 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
821 write_pts(q, 1, dts);
824 if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {
825 flags = 0x01; /* set PES_extension_flag_2 */
827 *q++ = 0x80 | 0x01; /* marker bit + extension length */
829 * Set the stream id extension flag bit to 0 and
830 * write the extended stream id
834 if (private_code != 0)
839 header_len = q - buf;
841 len = TS_PACKET_SIZE - header_len;
842 if (len > payload_size)
844 stuffing_len = TS_PACKET_SIZE - header_len - len;
845 if (stuffing_len > 0) {
846 /* add stuffing with AFC */
848 /* stuffing already present: increase its size */
849 afc_len = buf[4] + 1;
850 memmove(buf + 4 + afc_len + stuffing_len,
852 header_len - (4 + afc_len));
853 buf[4] += stuffing_len;
854 memset(buf + 4 + afc_len, 0xff, stuffing_len);
857 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
859 buf[4] = stuffing_len - 1;
860 if (stuffing_len >= 2) {
862 memset(buf + 6, 0xff, stuffing_len - 2);
866 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
869 avio_write(s->pb, buf, TS_PACKET_SIZE);
874 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
876 AVStream *st = s->streams[pkt->stream_index];
877 int size = pkt->size;
878 uint8_t *buf= pkt->data;
880 MpegTSWriteStream *ts_st = st->priv_data;
881 const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2;
882 int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
884 if (pkt->pts != AV_NOPTS_VALUE)
885 pts = pkt->pts + delay;
886 if (pkt->dts != AV_NOPTS_VALUE)
887 dts = pkt->dts + delay;
889 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
890 av_log(s, AV_LOG_ERROR, "first pts value must set\n");
893 ts_st->first_pts_check = 0;
895 if (st->codec->codec_id == CODEC_ID_H264) {
896 const uint8_t *p = buf, *buf_end = p+size;
899 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
900 av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, "
901 "no startcode found, use -vbsf h264_mp4toannexb\n");
906 p = ff_find_start_code(p, buf_end, &state);
907 //av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f);
908 } while (p < buf_end && (state & 0x1f) != 9 &&
909 (state & 0x1f) != 5 && (state & 0x1f) != 1);
911 if ((state & 0x1f) != 9) { // AUD NAL
912 data = av_malloc(pkt->size+6);
915 memcpy(data+6, pkt->data, pkt->size);
916 AV_WB32(data, 0x00000001);
918 data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
922 } else if (st->codec->codec_id == CODEC_ID_AAC) {
925 if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) {
926 ADTSContext *adts = ts_st->adts;
929 av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format "
930 "and extradata missing\n");
933 new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size;
934 if ((unsigned)new_size >= INT_MAX)
936 data = av_malloc(new_size);
938 return AVERROR(ENOMEM);
939 ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size);
940 if (adts->pce_size) {
941 memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size);
944 memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size);
950 if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
951 // for video and subtitle, write a single pes packet
952 mpegts_write_pes(s, st, buf, size, pts, dts);
957 if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) {
958 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
959 ts_st->payload_pts, ts_st->payload_dts);
960 ts_st->payload_index = 0;
963 if (!ts_st->payload_index) {
964 ts_st->payload_pts = pts;
965 ts_st->payload_dts = dts;
968 memcpy(ts_st->payload + ts_st->payload_index, buf, size);
969 ts_st->payload_index += size;
976 static int mpegts_write_end(AVFormatContext *s)
978 MpegTSWrite *ts = s->priv_data;
979 MpegTSWriteStream *ts_st;
980 MpegTSService *service;
984 /* flush current packets */
985 for(i = 0; i < s->nb_streams; i++) {
987 ts_st = st->priv_data;
988 if (ts_st->payload_index > 0) {
989 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
990 ts_st->payload_pts, ts_st->payload_dts);
992 av_freep(&ts_st->adts);
996 for(i = 0; i < ts->nb_services; i++) {
997 service = ts->services[i];
998 av_freep(&service->provider_name);
999 av_freep(&service->name);
1002 av_free(ts->services);
1007 AVOutputFormat ff_mpegts_muxer = {
1009 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1012 sizeof(MpegTSWrite),
1014 CODEC_ID_MPEG2VIDEO,
1015 mpegts_write_header,
1016 mpegts_write_packet,
1018 .priv_class = &mpegts_muxer_class,