c29f9bb87c60d14cd3f535af10d99de9168d4501
[libav.git] / libavformat / mpegtsenc.c
1 /*
2 * MPEG2 transport stream (aka DVB) muxer
3 * Copyright (c) 2003 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 #include "libavutil/bswap.h"
23 #include "libavutil/crc.h"
24 #include "libavcodec/mpegvideo.h"
25 #include "avformat.h"
26 #include "mpegts.h"
27
28 /* write DVB SI sections */
29
30 /*********************************************/
31 /* mpegts section writer */
32
33 typedef struct MpegTSSection {
34 int pid;
35 int cc;
36 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
37 void *opaque;
38 } MpegTSSection;
39
40 typedef struct MpegTSService {
41 MpegTSSection pmt; /* MPEG2 pmt table context */
42 int sid; /* service ID */
43 char *name;
44 char *provider_name;
45 int pcr_pid;
46 int pcr_packet_count;
47 int pcr_packet_freq;
48 } MpegTSService;
49
50 typedef struct MpegTSWrite {
51 MpegTSSection pat; /* MPEG2 pat table */
52 MpegTSSection sdt; /* MPEG2 sdt table context */
53 MpegTSService **services;
54 int sdt_packet_count;
55 int sdt_packet_freq;
56 int pat_packet_count;
57 int pat_packet_freq;
58 int nb_services;
59 int onid;
60 int tsid;
61 uint64_t cur_pcr;
62 int mux_rate;
63 } MpegTSWrite;
64
65 /* NOTE: 4 bytes must be left at the end for the crc32 */
66 static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
67 {
68 MpegTSWrite *ts = ((AVFormatContext*)s->opaque)->priv_data;
69 unsigned int crc;
70 unsigned char packet[TS_PACKET_SIZE];
71 const unsigned char *buf_ptr;
72 unsigned char *q;
73 int first, b, len1, left;
74
75 crc = bswap_32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4));
76 buf[len - 4] = (crc >> 24) & 0xff;
77 buf[len - 3] = (crc >> 16) & 0xff;
78 buf[len - 2] = (crc >> 8) & 0xff;
79 buf[len - 1] = (crc) & 0xff;
80
81 /* send each packet */
82 buf_ptr = buf;
83 while (len > 0) {
84 first = (buf == buf_ptr);
85 q = packet;
86 *q++ = 0x47;
87 b = (s->pid >> 8);
88 if (first)
89 b |= 0x40;
90 *q++ = b;
91 *q++ = s->pid;
92 *q++ = 0x10 | s->cc;
93 s->cc = (s->cc + 1) & 0xf;
94 if (first)
95 *q++ = 0; /* 0 offset */
96 len1 = TS_PACKET_SIZE - (q - packet);
97 if (len1 > len)
98 len1 = len;
99 memcpy(q, buf_ptr, len1);
100 q += len1;
101 /* add known padding data */
102 left = TS_PACKET_SIZE - (q - packet);
103 if (left > 0)
104 memset(q, 0xff, left);
105
106 s->write_packet(s, packet);
107
108 buf_ptr += len1;
109 len -= len1;
110
111 ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;
112 }
113 }
114
115 static inline void put16(uint8_t **q_ptr, int val)
116 {
117 uint8_t *q;
118 q = *q_ptr;
119 *q++ = val >> 8;
120 *q++ = val;
121 *q_ptr = q;
122 }
123
124 static int mpegts_write_section1(MpegTSSection *s, int tid, int id,
125 int version, int sec_num, int last_sec_num,
126 uint8_t *buf, int len)
127 {
128 uint8_t section[1024], *q;
129 unsigned int tot_len;
130
131 tot_len = 3 + 5 + len + 4;
132 /* check if not too big */
133 if (tot_len > 1024)
134 return -1;
135
136 q = section;
137 *q++ = tid;
138 put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
139 put16(&q, id);
140 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
141 *q++ = sec_num;
142 *q++ = last_sec_num;
143 memcpy(q, buf, len);
144
145 mpegts_write_section(s, section, tot_len);
146 return 0;
147 }
148
149 /*********************************************/
150 /* mpegts writer */
151
152 #define DEFAULT_PMT_START_PID 0x1000
153 #define DEFAULT_START_PID 0x0100
154 #define DEFAULT_PROVIDER_NAME "FFmpeg"
155 #define DEFAULT_SERVICE_NAME "Service01"
156
157 /* default network id, transport stream and service identifiers */
158 #define DEFAULT_ONID 0x0001
159 #define DEFAULT_TSID 0x0001
160 #define DEFAULT_SID 0x0001
161
162 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
163 #define DEFAULT_PES_HEADER_FREQ 16
164 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
165
166 /* we retransmit the SI info at this rate */
167 #define SDT_RETRANS_TIME 500
168 #define PAT_RETRANS_TIME 100
169 #define PCR_RETRANS_TIME 20
170
171 typedef struct MpegTSWriteStream {
172 struct MpegTSService *service;
173 int pid; /* stream associated pid */
174 int cc;
175 int payload_index;
176 int first_pts_check; ///< first pts check needed
177 int64_t payload_pts;
178 int64_t payload_dts;
179 uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
180 } MpegTSWriteStream;
181
182 static void mpegts_write_pat(AVFormatContext *s)
183 {
184 MpegTSWrite *ts = s->priv_data;
185 MpegTSService *service;
186 uint8_t data[1012], *q;
187 int i;
188
189 q = data;
190 for(i = 0; i < ts->nb_services; i++) {
191 service = ts->services[i];
192 put16(&q, service->sid);
193 put16(&q, 0xe000 | service->pmt.pid);
194 }
195 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
196 data, q - data);
197 }
198
199 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
200 {
201 // MpegTSWrite *ts = s->priv_data;
202 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
203 int val, stream_type, i;
204
205 q = data;
206 put16(&q, 0xe000 | service->pcr_pid);
207
208 program_info_length_ptr = q;
209 q += 2; /* patched after */
210
211 /* put program info here */
212
213 val = 0xf000 | (q - program_info_length_ptr - 2);
214 program_info_length_ptr[0] = val >> 8;
215 program_info_length_ptr[1] = val;
216
217 for(i = 0; i < s->nb_streams; i++) {
218 AVStream *st = s->streams[i];
219 MpegTSWriteStream *ts_st = st->priv_data;
220 AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0);
221 switch(st->codec->codec_id) {
222 case CODEC_ID_MPEG1VIDEO:
223 case CODEC_ID_MPEG2VIDEO:
224 stream_type = STREAM_TYPE_VIDEO_MPEG2;
225 break;
226 case CODEC_ID_MPEG4:
227 stream_type = STREAM_TYPE_VIDEO_MPEG4;
228 break;
229 case CODEC_ID_H264:
230 stream_type = STREAM_TYPE_VIDEO_H264;
231 break;
232 case CODEC_ID_DIRAC:
233 stream_type = STREAM_TYPE_VIDEO_DIRAC;
234 break;
235 case CODEC_ID_MP2:
236 case CODEC_ID_MP3:
237 stream_type = STREAM_TYPE_AUDIO_MPEG1;
238 break;
239 case CODEC_ID_AAC:
240 stream_type = STREAM_TYPE_AUDIO_AAC;
241 break;
242 case CODEC_ID_AC3:
243 stream_type = STREAM_TYPE_AUDIO_AC3;
244 break;
245 default:
246 stream_type = STREAM_TYPE_PRIVATE_DATA;
247 break;
248 }
249 *q++ = stream_type;
250 put16(&q, 0xe000 | ts_st->pid);
251 desc_length_ptr = q;
252 q += 2; /* patched after */
253
254 /* write optional descriptors here */
255 switch(st->codec->codec_type) {
256 case CODEC_TYPE_AUDIO:
257 if (lang && strlen(lang->value) == 3) {
258 *q++ = 0x0a; /* ISO 639 language descriptor */
259 *q++ = 4;
260 *q++ = lang->value[0];
261 *q++ = lang->value[1];
262 *q++ = lang->value[2];
263 *q++ = 0; /* undefined type */
264 }
265 break;
266 case CODEC_TYPE_SUBTITLE:
267 {
268 const char *language;
269 language = lang && strlen(lang->value)==3 ? lang->value : "eng";
270 *q++ = 0x59;
271 *q++ = 8;
272 *q++ = language[0];
273 *q++ = language[1];
274 *q++ = language[2];
275 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
276 put16(&q, 1); /* page id */
277 put16(&q, 1); /* ancillary page id */
278 }
279 break;
280 case CODEC_TYPE_VIDEO:
281 if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
282 *q++ = 0x05; /*MPEG-2 registration descriptor*/
283 *q++ = 4;
284 *q++ = 'd';
285 *q++ = 'r';
286 *q++ = 'a';
287 *q++ = 'c';
288 }
289 break;
290 }
291
292 val = 0xf000 | (q - desc_length_ptr - 2);
293 desc_length_ptr[0] = val >> 8;
294 desc_length_ptr[1] = val;
295 }
296 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
297 data, q - data);
298 }
299
300 /* NOTE: str == NULL is accepted for an empty string */
301 static void putstr8(uint8_t **q_ptr, const char *str)
302 {
303 uint8_t *q;
304 int len;
305
306 q = *q_ptr;
307 if (!str)
308 len = 0;
309 else
310 len = strlen(str);
311 *q++ = len;
312 memcpy(q, str, len);
313 q += len;
314 *q_ptr = q;
315 }
316
317 static void mpegts_write_sdt(AVFormatContext *s)
318 {
319 MpegTSWrite *ts = s->priv_data;
320 MpegTSService *service;
321 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
322 int i, running_status, free_ca_mode, val;
323
324 q = data;
325 put16(&q, ts->onid);
326 *q++ = 0xff;
327 for(i = 0; i < ts->nb_services; i++) {
328 service = ts->services[i];
329 put16(&q, service->sid);
330 *q++ = 0xfc | 0x00; /* currently no EIT info */
331 desc_list_len_ptr = q;
332 q += 2;
333 running_status = 4; /* running */
334 free_ca_mode = 0;
335
336 /* write only one descriptor for the service name and provider */
337 *q++ = 0x48;
338 desc_len_ptr = q;
339 q++;
340 *q++ = 0x01; /* digital television service */
341 putstr8(&q, service->provider_name);
342 putstr8(&q, service->name);
343 desc_len_ptr[0] = q - desc_len_ptr - 1;
344
345 /* fill descriptor length */
346 val = (running_status << 13) | (free_ca_mode << 12) |
347 (q - desc_list_len_ptr - 2);
348 desc_list_len_ptr[0] = val >> 8;
349 desc_list_len_ptr[1] = val;
350 }
351 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
352 data, q - data);
353 }
354
355 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
356 int sid,
357 const char *provider_name,
358 const char *name)
359 {
360 MpegTSService *service;
361
362 service = av_mallocz(sizeof(MpegTSService));
363 if (!service)
364 return NULL;
365 service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1;
366 service->sid = sid;
367 service->provider_name = av_strdup(provider_name);
368 service->name = av_strdup(name);
369 service->pcr_pid = 0x1fff;
370 dynarray_add(&ts->services, &ts->nb_services, service);
371 return service;
372 }
373
374 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
375 {
376 AVFormatContext *ctx = s->opaque;
377 put_buffer(ctx->pb, packet, TS_PACKET_SIZE);
378 }
379
380 static int mpegts_write_header(AVFormatContext *s)
381 {
382 MpegTSWrite *ts = s->priv_data;
383 MpegTSWriteStream *ts_st;
384 MpegTSService *service;
385 AVStream *st;
386 AVMetadataTag *title;
387 int i, total_bit_rate;
388 const char *service_name;
389 uint64_t sdt_size, pat_pmt_size, pos;
390
391 ts->tsid = DEFAULT_TSID;
392 ts->onid = DEFAULT_ONID;
393 /* allocate a single DVB service */
394 title = av_metadata_get(s->metadata, "title", NULL, 0);
395 service_name = title ? title->value : DEFAULT_SERVICE_NAME;
396 service = mpegts_add_service(ts, DEFAULT_SID,
397 DEFAULT_PROVIDER_NAME, service_name);
398 service->pmt.write_packet = section_write_packet;
399 service->pmt.opaque = s;
400
401 ts->pat.pid = PAT_PID;
402 ts->pat.cc = 0;
403 ts->pat.write_packet = section_write_packet;
404 ts->pat.opaque = s;
405
406 ts->sdt.pid = SDT_PID;
407 ts->sdt.cc = 0;
408 ts->sdt.write_packet = section_write_packet;
409 ts->sdt.opaque = s;
410
411 /* assign pids to each stream */
412 total_bit_rate = 0;
413 for(i = 0;i < s->nb_streams; i++) {
414 st = s->streams[i];
415 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
416 if (!ts_st)
417 goto fail;
418 st->priv_data = ts_st;
419 ts_st->service = service;
420 ts_st->pid = DEFAULT_START_PID + i;
421 ts_st->payload_pts = AV_NOPTS_VALUE;
422 ts_st->payload_dts = AV_NOPTS_VALUE;
423 ts_st->first_pts_check = 1;
424 /* update PCR pid by using the first video stream */
425 if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
426 service->pcr_pid == 0x1fff)
427 service->pcr_pid = ts_st->pid;
428 total_bit_rate += st->codec->bit_rate;
429 /* PES header size */
430 if (st->codec->codec_type == CODEC_TYPE_VIDEO ||
431 st->codec->codec_type == CODEC_TYPE_SUBTITLE)
432 total_bit_rate += 25 * 8 / av_q2d(st->codec->time_base);
433 else
434 total_bit_rate += total_bit_rate * 25 / DEFAULT_PES_PAYLOAD_SIZE;
435 }
436
437 /* if no video stream, use the first stream as PCR */
438 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
439 ts_st = s->streams[0]->priv_data;
440 service->pcr_pid = ts_st->pid;
441 }
442
443 if (total_bit_rate <= 8 * 1024)
444 total_bit_rate = 8 * 1024;
445 service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) /
446 (TS_PACKET_SIZE * 8 * 1000);
447 ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) /
448 (TS_PACKET_SIZE * 8 * 1000);
449 ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) /
450 (TS_PACKET_SIZE * 8 * 1000);
451
452 ts->mux_rate = 1; // avoid div by 0
453
454 /* write info at the start of the file, so that it will be fast to
455 find them */
456 pos = url_ftell(s->pb);
457 mpegts_write_sdt(s);
458 sdt_size = url_ftell(s->pb) - pos;
459 pos = url_ftell(s->pb);
460 mpegts_write_pat(s);
461 for(i = 0; i < ts->nb_services; i++) {
462 mpegts_write_pmt(s, ts->services[i]);
463 }
464 pat_pmt_size = url_ftell(s->pb) - pos;
465
466 total_bit_rate +=
467 total_bit_rate * 4 / TS_PACKET_SIZE + /* TS header size */
468 SDT_RETRANS_TIME * 8 * sdt_size / 1000 + /* SDT size */
469 PAT_RETRANS_TIME * 8 * pat_pmt_size / 1000 + /* PAT+PMT size */
470 PCR_RETRANS_TIME * 8 * 8 / 1000; /* PCR size */
471
472 av_log(s, AV_LOG_DEBUG, "muxrate %d freq sdt %d pat %d\n",
473 total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq);
474
475 if (s->mux_rate)
476 ts->mux_rate = s->mux_rate;
477 else
478 ts->mux_rate = total_bit_rate;
479
480 // adjust pcr
481 ts->cur_pcr /= ts->mux_rate;
482
483 put_flush_packet(s->pb);
484
485 return 0;
486
487 fail:
488 for(i = 0;i < s->nb_streams; i++) {
489 st = s->streams[i];
490 av_free(st->priv_data);
491 }
492 return -1;
493 }
494
495 /* send SDT, PAT and PMT tables regulary */
496 static void retransmit_si_info(AVFormatContext *s)
497 {
498 MpegTSWrite *ts = s->priv_data;
499 int i;
500
501 if (++ts->sdt_packet_count == ts->sdt_packet_freq) {
502 ts->sdt_packet_count = 0;
503 mpegts_write_sdt(s);
504 }
505 if (++ts->pat_packet_count == ts->pat_packet_freq) {
506 ts->pat_packet_count = 0;
507 mpegts_write_pat(s);
508 for(i = 0; i < ts->nb_services; i++) {
509 mpegts_write_pmt(s, ts->services[i]);
510 }
511 }
512 }
513
514 static void write_pts(uint8_t *q, int fourbits, int64_t pts)
515 {
516 int val;
517
518 val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1;
519 *q++ = val;
520 val = (((pts >> 15) & 0x7fff) << 1) | 1;
521 *q++ = val >> 8;
522 *q++ = val;
523 val = (((pts) & 0x7fff) << 1) | 1;
524 *q++ = val >> 8;
525 *q++ = val;
526 }
527
528 /* NOTE: pes_data contains all the PES packet */
529 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
530 const uint8_t *payload, int payload_size,
531 int64_t pts, int64_t dts)
532 {
533 MpegTSWriteStream *ts_st = st->priv_data;
534 MpegTSWrite *ts = s->priv_data;
535 uint8_t buf[TS_PACKET_SIZE];
536 uint8_t *q;
537 int val, is_start, len, header_len, write_pcr, private_code, flags;
538 int afc_len, stuffing_len;
539 int64_t pcr = -1; /* avoid warning */
540
541 is_start = 1;
542 while (payload_size > 0) {
543 retransmit_si_info(s);
544
545 write_pcr = 0;
546 if (ts_st->pid == ts_st->service->pcr_pid) {
547 ts_st->service->pcr_packet_count++;
548 if (ts_st->service->pcr_packet_count >=
549 ts_st->service->pcr_packet_freq) {
550 ts_st->service->pcr_packet_count = 0;
551 write_pcr = 1;
552 }
553 }
554
555 /* prepare packet header */
556 q = buf;
557 *q++ = 0x47;
558 val = (ts_st->pid >> 8);
559 if (is_start)
560 val |= 0x40;
561 *q++ = val;
562 *q++ = ts_st->pid;
563 *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
564 ts_st->cc = (ts_st->cc + 1) & 0xf;
565 if (write_pcr) {
566 // add 11, pcr references the last byte of program clock reference base
567 pcr = ts->cur_pcr + (4+7)*8*90000LL / ts->mux_rate;
568 if (dts != AV_NOPTS_VALUE && dts < pcr)
569 av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
570 *q++ = 7; /* AFC length */
571 *q++ = 0x10; /* flags: PCR present */
572 *q++ = pcr >> 25;
573 *q++ = pcr >> 17;
574 *q++ = pcr >> 9;
575 *q++ = pcr >> 1;
576 *q++ = (pcr & 1) << 7;
577 *q++ = 0;
578 }
579 if (is_start) {
580 int pes_extension = 0;
581 /* write PES header */
582 *q++ = 0x00;
583 *q++ = 0x00;
584 *q++ = 0x01;
585 private_code = 0;
586 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
587 if (st->codec->codec_id == CODEC_ID_DIRAC) {
588 *q++ = 0xfd;
589 } else
590 *q++ = 0xe0;
591 } else if (st->codec->codec_type == CODEC_TYPE_AUDIO &&
592 (st->codec->codec_id == CODEC_ID_MP2 ||
593 st->codec->codec_id == CODEC_ID_MP3)) {
594 *q++ = 0xc0;
595 } else {
596 *q++ = 0xbd;
597 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
598 private_code = 0x20;
599 }
600 }
601 header_len = 0;
602 flags = 0;
603 if (pts != AV_NOPTS_VALUE) {
604 header_len += 5;
605 flags |= 0x80;
606 }
607 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
608 header_len += 5;
609 flags |= 0x40;
610 }
611 if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
612 st->codec->codec_id == CODEC_ID_DIRAC) {
613 /* set PES_extension_flag */
614 pes_extension = 1;
615 flags |= 0x01;
616
617 /*
618 * One byte for PES2 extension flag +
619 * one byte for extension length +
620 * one byte for extension id
621 */
622 header_len += 3;
623 }
624 len = payload_size + header_len + 3;
625 if (private_code != 0)
626 len++;
627 if (len > 0xffff)
628 len = 0;
629 *q++ = len >> 8;
630 *q++ = len;
631 val = 0x80;
632 /* data alignment indicator is required for subtitle data */
633 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE)
634 val |= 0x04;
635 *q++ = val;
636 *q++ = flags;
637 *q++ = header_len;
638 if (pts != AV_NOPTS_VALUE) {
639 write_pts(q, flags >> 6, pts);
640 q += 5;
641 }
642 if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
643 write_pts(q, 1, dts);
644 q += 5;
645 }
646 if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {
647 flags = 0x01; /* set PES_extension_flag_2 */
648 *q++ = flags;
649 *q++ = 0x80 | 0x01; /* marker bit + extension length */
650 /*
651 * Set the stream id extension flag bit to 0 and
652 * write the extended stream id
653 */
654 *q++ = 0x00 | 0x60;
655 }
656 if (private_code != 0)
657 *q++ = private_code;
658 is_start = 0;
659 }
660 /* header size */
661 header_len = q - buf;
662 /* data len */
663 len = TS_PACKET_SIZE - header_len;
664 if (len > payload_size)
665 len = payload_size;
666 stuffing_len = TS_PACKET_SIZE - header_len - len;
667 if (stuffing_len > 0) {
668 /* add stuffing with AFC */
669 if (buf[3] & 0x20) {
670 /* stuffing already present: increase its size */
671 afc_len = buf[4] + 1;
672 memmove(buf + 4 + afc_len + stuffing_len,
673 buf + 4 + afc_len,
674 header_len - (4 + afc_len));
675 buf[4] += stuffing_len;
676 memset(buf + 4 + afc_len, 0xff, stuffing_len);
677 } else {
678 /* add stuffing */
679 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
680 buf[3] |= 0x20;
681 buf[4] = stuffing_len - 1;
682 if (stuffing_len >= 2) {
683 buf[5] = 0x00;
684 memset(buf + 6, 0xff, stuffing_len - 2);
685 }
686 }
687 }
688 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
689 payload += len;
690 payload_size -= len;
691 put_buffer(s->pb, buf, TS_PACKET_SIZE);
692 ts->cur_pcr += TS_PACKET_SIZE*8*90000LL/ts->mux_rate;
693 }
694 put_flush_packet(s->pb);
695 }
696
697 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
698 {
699 AVStream *st = s->streams[pkt->stream_index];
700 int len, size = pkt->size;
701 uint8_t *buf= pkt->data;
702 uint8_t *data= NULL;
703 MpegTSWriteStream *ts_st = st->priv_data;
704 const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
705 int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE;
706
707 if (pkt->pts != AV_NOPTS_VALUE)
708 pts = pkt->pts + delay;
709 if (pkt->dts != AV_NOPTS_VALUE)
710 dts = pkt->dts + delay;
711
712 if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
713 av_log(s, AV_LOG_ERROR, "first pts value must set\n");
714 return -1;
715 }
716 ts_st->first_pts_check = 0;
717
718 if (st->codec->codec_id == CODEC_ID_H264) {
719 if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) {
720 av_log(s, AV_LOG_ERROR, "h264 bitstream malformated\n");
721 return -1;
722 }
723 if (pkt->data[4] != 0x09) { // AUD NAL
724 data = av_malloc(pkt->size+6);
725 if (!data)
726 return -1;
727 memcpy(data+6, pkt->data, pkt->size);
728 AV_WB32(data, 0x00000001);
729 data[4] = 0x09;
730 data[5] = 0xe0; // any slice type
731 buf = data;
732 size = pkt->size+6;
733 }
734 }
735
736 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE ||
737 st->codec->codec_type == CODEC_TYPE_VIDEO) {
738 // for video and subtitle, write a single pes packet
739 mpegts_write_pes(s, st, buf, size, pts, dts);
740 av_free(data);
741 return 0;
742 }
743
744 if (ts_st->payload_pts == AV_NOPTS_VALUE) {
745 ts_st->payload_dts = dts;
746 ts_st->payload_pts = pts;
747 }
748
749 // audio
750 while (size > 0) {
751 len = DEFAULT_PES_PAYLOAD_SIZE - ts_st->payload_index;
752 if (len > size)
753 len = size;
754 memcpy(ts_st->payload + ts_st->payload_index, buf, len);
755 buf += len;
756 size -= len;
757 ts_st->payload_index += len;
758 if (ts_st->payload_index >= DEFAULT_PES_PAYLOAD_SIZE) {
759 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
760 ts_st->payload_pts, ts_st->payload_dts);
761 ts_st->payload_pts = AV_NOPTS_VALUE;
762 ts_st->payload_dts = AV_NOPTS_VALUE;
763 ts_st->payload_index = 0;
764 }
765 }
766
767 return 0;
768 }
769
770 static int mpegts_write_end(AVFormatContext *s)
771 {
772 MpegTSWrite *ts = s->priv_data;
773 MpegTSWriteStream *ts_st;
774 MpegTSService *service;
775 AVStream *st;
776 int i;
777
778 /* flush current packets */
779 for(i = 0; i < s->nb_streams; i++) {
780 st = s->streams[i];
781 ts_st = st->priv_data;
782 if (ts_st->payload_index > 0) {
783 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
784 ts_st->payload_pts, ts_st->payload_dts);
785 }
786 }
787 put_flush_packet(s->pb);
788
789 for(i = 0; i < ts->nb_services; i++) {
790 service = ts->services[i];
791 av_freep(&service->provider_name);
792 av_freep(&service->name);
793 av_free(service);
794 }
795 av_free(ts->services);
796
797 return 0;
798 }
799
800 AVOutputFormat mpegts_muxer = {
801 "mpegts",
802 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
803 "video/x-mpegts",
804 "ts,m2t",
805 sizeof(MpegTSWrite),
806 CODEC_ID_MP2,
807 CODEC_ID_MPEG2VIDEO,
808 mpegts_write_header,
809 mpegts_write_packet,
810 mpegts_write_end,
811 };