changing AVCodecContext codec -> *codec in AVStream so additions to AVCodecContext...
[libav.git] / libavformat / mpegtsenc.c
1 /*
2 * MPEG2 transport stream (aka DVB) mux
3 * Copyright (c) 2003 Fabrice Bellard.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19 #include "avformat.h"
20
21 #include "mpegts.h"
22
23 /* write DVB SI sections */
24
25 static const uint32_t crc_table[256] = {
26 0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
27 0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
28 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
29 0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
30 0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
31 0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
32 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
33 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
34 0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
35 0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
36 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
37 0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
38 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4,
39 0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
40 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
41 0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
42 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
43 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
44 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
45 0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
46 0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
47 0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
48 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
49 0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
50 0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
51 0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
52 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
53 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
54 0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
55 0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
56 0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
57 0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
58 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
59 0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
60 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
61 0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
62 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
63 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
64 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
65 0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
66 0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
67 0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
68 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
69 };
70
71 unsigned int mpegts_crc32(const uint8_t *data, int len)
72 {
73 register int i;
74 unsigned int crc = 0xffffffff;
75
76 for (i=0; i<len; i++)
77 crc = (crc << 8) ^ crc_table[((crc >> 24) ^ *data++) & 0xff];
78
79 return crc;
80 }
81
82 /*********************************************/
83 /* mpegts section writer */
84
85 typedef struct MpegTSSection {
86 int pid;
87 int cc;
88 void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet);
89 void *opaque;
90 } MpegTSSection;
91
92 /* NOTE: 4 bytes must be left at the end for the crc32 */
93 void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len)
94 {
95 unsigned int crc;
96 unsigned char packet[TS_PACKET_SIZE];
97 const unsigned char *buf_ptr;
98 unsigned char *q;
99 int first, b, len1, left;
100
101 crc = mpegts_crc32(buf, len - 4);
102 buf[len - 4] = (crc >> 24) & 0xff;
103 buf[len - 3] = (crc >> 16) & 0xff;
104 buf[len - 2] = (crc >> 8) & 0xff;
105 buf[len - 1] = (crc) & 0xff;
106
107 /* send each packet */
108 buf_ptr = buf;
109 while (len > 0) {
110 first = (buf == buf_ptr);
111 q = packet;
112 *q++ = 0x47;
113 b = (s->pid >> 8);
114 if (first)
115 b |= 0x40;
116 *q++ = b;
117 *q++ = s->pid;
118 s->cc = (s->cc + 1) & 0xf;
119 *q++ = 0x10 | s->cc;
120 if (first)
121 *q++ = 0; /* 0 offset */
122 len1 = TS_PACKET_SIZE - (q - packet);
123 if (len1 > len)
124 len1 = len;
125 memcpy(q, buf_ptr, len1);
126 q += len1;
127 /* add known padding data */
128 left = TS_PACKET_SIZE - (q - packet);
129 if (left > 0)
130 memset(q, 0xff, left);
131
132 s->write_packet(s, packet);
133
134 buf_ptr += len1;
135 len -= len1;
136 }
137 }
138
139 static inline void put16(uint8_t **q_ptr, int val)
140 {
141 uint8_t *q;
142 q = *q_ptr;
143 *q++ = val >> 8;
144 *q++ = val;
145 *q_ptr = q;
146 }
147
148 int mpegts_write_section1(MpegTSSection *s, int tid, int id,
149 int version, int sec_num, int last_sec_num,
150 uint8_t *buf, int len)
151 {
152 uint8_t section[1024], *q;
153 unsigned int tot_len;
154
155 tot_len = 3 + 5 + len + 4;
156 /* check if not too big */
157 if (tot_len > 1024)
158 return -1;
159
160 q = section;
161 *q++ = tid;
162 put16(&q, 0xb000 | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */
163 put16(&q, id);
164 *q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */
165 *q++ = sec_num;
166 *q++ = last_sec_num;
167 memcpy(q, buf, len);
168
169 mpegts_write_section(s, section, tot_len);
170 return 0;
171 }
172
173 /*********************************************/
174 /* mpegts writer */
175
176 #define DEFAULT_PMT_START_PID 0x1000
177 #define DEFAULT_START_PID 0x0100
178 #define DEFAULT_PROVIDER_NAME "FFmpeg"
179 #define DEFAULT_SERVICE_NAME "Service01"
180
181 /* default network id, transport stream and service identifiers */
182 #define DEFAULT_ONID 0x0001
183 #define DEFAULT_TSID 0x0001
184 #define DEFAULT_SID 0x0001
185
186 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
187 #define DEFAULT_PES_HEADER_FREQ 16
188 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
189
190 /* we retransmit the SI info at this rate */
191 #define SDT_RETRANS_TIME 500
192 #define PAT_RETRANS_TIME 100
193 #define PCR_RETRANS_TIME 20
194
195 typedef struct MpegTSWriteStream {
196 struct MpegTSService *service;
197 int pid; /* stream associated pid */
198 int cc;
199 int payload_index;
200 int64_t payload_pts;
201 uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE];
202 } MpegTSWriteStream;
203
204 typedef struct MpegTSService {
205 MpegTSSection pmt; /* MPEG2 pmt table context */
206 int sid; /* service ID */
207 char *name;
208 char *provider_name;
209 int pcr_pid;
210 int pcr_packet_count;
211 int pcr_packet_freq;
212 } MpegTSService;
213
214 typedef struct MpegTSWrite {
215 MpegTSSection pat; /* MPEG2 pat table */
216 MpegTSSection sdt; /* MPEG2 sdt table context */
217 MpegTSService **services;
218 int sdt_packet_count;
219 int sdt_packet_freq;
220 int pat_packet_count;
221 int pat_packet_freq;
222 int nb_services;
223 int onid;
224 int tsid;
225 } MpegTSWrite;
226
227 static void mpegts_write_pat(AVFormatContext *s)
228 {
229 MpegTSWrite *ts = s->priv_data;
230 MpegTSService *service;
231 uint8_t data[1012], *q;
232 int i;
233
234 q = data;
235 for(i = 0; i < ts->nb_services; i++) {
236 service = ts->services[i];
237 put16(&q, service->sid);
238 put16(&q, 0xe000 | service->pmt.pid);
239 }
240 mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0,
241 data, q - data);
242 }
243
244 static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
245 {
246 // MpegTSWrite *ts = s->priv_data;
247 uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
248 int val, stream_type, i;
249
250 q = data;
251 put16(&q, 0xe000 | service->pcr_pid);
252
253 program_info_length_ptr = q;
254 q += 2; /* patched after */
255
256 /* put program info here */
257
258 val = 0xf000 | (q - program_info_length_ptr - 2);
259 program_info_length_ptr[0] = val >> 8;
260 program_info_length_ptr[1] = val;
261
262 for(i = 0; i < s->nb_streams; i++) {
263 AVStream *st = s->streams[i];
264 MpegTSWriteStream *ts_st = st->priv_data;
265 switch(st->codec->codec_id) {
266 case CODEC_ID_MPEG1VIDEO:
267 case CODEC_ID_MPEG2VIDEO:
268 stream_type = STREAM_TYPE_VIDEO_MPEG2;
269 break;
270 case CODEC_ID_MPEG4:
271 stream_type = STREAM_TYPE_VIDEO_MPEG4;
272 break;
273 case CODEC_ID_H264:
274 stream_type = STREAM_TYPE_VIDEO_H264;
275 break;
276 case CODEC_ID_MP2:
277 case CODEC_ID_MP3:
278 stream_type = STREAM_TYPE_AUDIO_MPEG1;
279 break;
280 case CODEC_ID_AAC:
281 stream_type = STREAM_TYPE_AUDIO_AAC;
282 break;
283 case CODEC_ID_AC3:
284 stream_type = STREAM_TYPE_AUDIO_AC3;
285 break;
286 default:
287 stream_type = STREAM_TYPE_PRIVATE_DATA;
288 break;
289 }
290 *q++ = stream_type;
291 put16(&q, 0xe000 | ts_st->pid);
292 desc_length_ptr = q;
293 q += 2; /* patched after */
294
295 /* write optional descriptors here */
296 switch(st->codec->codec_type) {
297 case CODEC_TYPE_AUDIO:
298 if (strlen(st->language) == 3) {
299 *q++ = 0x0a; /* ISO 639 language descriptor */
300 *q++ = 4;
301 *q++ = st->language[0];
302 *q++ = st->language[1];
303 *q++ = st->language[2];
304 *q++ = 0; /* undefined type */
305 }
306 break;
307 case CODEC_TYPE_SUBTITLE:
308 {
309 const char *language;
310 language = st->language;
311 if (strlen(language) != 3)
312 language = "eng";
313 *q++ = 0x59;
314 *q++ = 8;
315 *q++ = language[0];
316 *q++ = language[1];
317 *q++ = language[2];
318 *q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
319 put16(&q, 1); /* page id */
320 put16(&q, 1); /* ancillary page id */
321 }
322 break;
323 }
324
325 val = 0xf000 | (q - desc_length_ptr - 2);
326 desc_length_ptr[0] = val >> 8;
327 desc_length_ptr[1] = val;
328 }
329 mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0,
330 data, q - data);
331 }
332
333 /* NOTE: str == NULL is accepted for an empty string */
334 static void putstr8(uint8_t **q_ptr, const char *str)
335 {
336 uint8_t *q;
337 int len;
338
339 q = *q_ptr;
340 if (!str)
341 len = 0;
342 else
343 len = strlen(str);
344 *q++ = len;
345 memcpy(q, str, len);
346 q += len;
347 *q_ptr = q;
348 }
349
350 static void mpegts_write_sdt(AVFormatContext *s)
351 {
352 MpegTSWrite *ts = s->priv_data;
353 MpegTSService *service;
354 uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
355 int i, running_status, free_ca_mode, val;
356
357 q = data;
358 put16(&q, ts->onid);
359 *q++ = 0xff;
360 for(i = 0; i < ts->nb_services; i++) {
361 service = ts->services[i];
362 put16(&q, service->sid);
363 *q++ = 0xfc | 0x00; /* currently no EIT info */
364 desc_list_len_ptr = q;
365 q += 2;
366 running_status = 4; /* running */
367 free_ca_mode = 0;
368
369 /* write only one descriptor for the service name and provider */
370 *q++ = 0x48;
371 desc_len_ptr = q;
372 q++;
373 *q++ = 0x01; /* digital television service */
374 putstr8(&q, service->provider_name);
375 putstr8(&q, service->name);
376 desc_len_ptr[0] = q - desc_len_ptr - 1;
377
378 /* fill descriptor length */
379 val = (running_status << 13) | (free_ca_mode << 12) |
380 (q - desc_list_len_ptr - 2);
381 desc_list_len_ptr[0] = val >> 8;
382 desc_list_len_ptr[1] = val;
383 }
384 mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0,
385 data, q - data);
386 }
387
388 static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
389 int sid,
390 const char *provider_name,
391 const char *name)
392 {
393 MpegTSService *service;
394
395 service = av_mallocz(sizeof(MpegTSService));
396 if (!service)
397 return NULL;
398 service->pmt.pid = DEFAULT_PMT_START_PID + ts->nb_services - 1;
399 service->sid = sid;
400 service->provider_name = av_strdup(provider_name);
401 service->name = av_strdup(name);
402 service->pcr_pid = 0x1fff;
403 dynarray_add(&ts->services, &ts->nb_services, service);
404 return service;
405 }
406
407 static void section_write_packet(MpegTSSection *s, const uint8_t *packet)
408 {
409 AVFormatContext *ctx = s->opaque;
410 put_buffer(&ctx->pb, packet, TS_PACKET_SIZE);
411 }
412
413 static int mpegts_write_header(AVFormatContext *s)
414 {
415 MpegTSWrite *ts = s->priv_data;
416 MpegTSWriteStream *ts_st;
417 MpegTSService *service;
418 AVStream *st;
419 int i, total_bit_rate;
420 const char *service_name;
421
422 ts->tsid = DEFAULT_TSID;
423 ts->onid = DEFAULT_ONID;
424 /* allocate a single DVB service */
425 service_name = s->title;
426 if (service_name[0] == '\0')
427 service_name = DEFAULT_SERVICE_NAME;
428 service = mpegts_add_service(ts, DEFAULT_SID,
429 DEFAULT_PROVIDER_NAME, service_name);
430 service->pmt.write_packet = section_write_packet;
431 service->pmt.opaque = s;
432
433 ts->pat.pid = PAT_PID;
434 ts->pat.cc = 0;
435 ts->pat.write_packet = section_write_packet;
436 ts->pat.opaque = s;
437
438 ts->sdt.pid = SDT_PID;
439 ts->sdt.cc = 0;
440 ts->sdt.write_packet = section_write_packet;
441 ts->sdt.opaque = s;
442
443 /* assign pids to each stream */
444 total_bit_rate = 0;
445 for(i = 0;i < s->nb_streams; i++) {
446 st = s->streams[i];
447 ts_st = av_mallocz(sizeof(MpegTSWriteStream));
448 if (!ts_st)
449 goto fail;
450 st->priv_data = ts_st;
451 ts_st->service = service;
452 ts_st->pid = DEFAULT_START_PID + i;
453 ts_st->payload_pts = AV_NOPTS_VALUE;
454 /* update PCR pid by using the first video stream */
455 if (st->codec->codec_type == CODEC_TYPE_VIDEO &&
456 service->pcr_pid == 0x1fff)
457 service->pcr_pid = ts_st->pid;
458 total_bit_rate += st->codec->bit_rate;
459 }
460
461 /* if no video stream, use the first stream as PCR */
462 if (service->pcr_pid == 0x1fff && s->nb_streams > 0) {
463 ts_st = s->streams[0]->priv_data;
464 service->pcr_pid = ts_st->pid;
465 }
466
467 if (total_bit_rate <= 8 * 1024)
468 total_bit_rate = 8 * 1024;
469 service->pcr_packet_freq = (total_bit_rate * PCR_RETRANS_TIME) /
470 (TS_PACKET_SIZE * 8 * 1000);
471 ts->sdt_packet_freq = (total_bit_rate * SDT_RETRANS_TIME) /
472 (TS_PACKET_SIZE * 8 * 1000);
473 ts->pat_packet_freq = (total_bit_rate * PAT_RETRANS_TIME) /
474 (TS_PACKET_SIZE * 8 * 1000);
475 #if 0
476 printf("%d %d %d\n",
477 total_bit_rate, ts->sdt_packet_freq, ts->pat_packet_freq);
478 #endif
479
480 /* write info at the start of the file, so that it will be fast to
481 find them */
482 mpegts_write_sdt(s);
483 mpegts_write_pat(s);
484 for(i = 0; i < ts->nb_services; i++) {
485 mpegts_write_pmt(s, ts->services[i]);
486 }
487 put_flush_packet(&s->pb);
488
489 return 0;
490
491 fail:
492 for(i = 0;i < s->nb_streams; i++) {
493 st = s->streams[i];
494 av_free(st->priv_data);
495 }
496 return -1;
497 }
498
499 /* send SDT, PAT and PMT tables regulary */
500 static void retransmit_si_info(AVFormatContext *s)
501 {
502 MpegTSWrite *ts = s->priv_data;
503 int i;
504
505 if (++ts->sdt_packet_count == ts->sdt_packet_freq) {
506 ts->sdt_packet_count = 0;
507 mpegts_write_sdt(s);
508 }
509 if (++ts->pat_packet_count == ts->pat_packet_freq) {
510 ts->pat_packet_count = 0;
511 mpegts_write_pat(s);
512 for(i = 0; i < ts->nb_services; i++) {
513 mpegts_write_pmt(s, ts->services[i]);
514 }
515 }
516 }
517
518 /* NOTE: pes_data contains all the PES packet */
519 static void mpegts_write_pes(AVFormatContext *s, AVStream *st,
520 const uint8_t *payload, int payload_size,
521 int64_t pts)
522 {
523 MpegTSWriteStream *ts_st = st->priv_data;
524 uint8_t buf[TS_PACKET_SIZE];
525 uint8_t *q;
526 int val, is_start, len, header_len, write_pcr, private_code;
527 int afc_len, stuffing_len;
528 int64_t pcr = -1; /* avoid warning */
529
530 is_start = 1;
531 while (payload_size > 0) {
532 retransmit_si_info(s);
533
534 write_pcr = 0;
535 if (ts_st->pid == ts_st->service->pcr_pid) {
536 ts_st->service->pcr_packet_count++;
537 if (ts_st->service->pcr_packet_count >=
538 ts_st->service->pcr_packet_freq) {
539 ts_st->service->pcr_packet_count = 0;
540 write_pcr = 1;
541 /* XXX: this is incorrect, but at least we have a PCR
542 value */
543 pcr = pts;
544 }
545 }
546
547 /* prepare packet header */
548 q = buf;
549 *q++ = 0x47;
550 val = (ts_st->pid >> 8);
551 if (is_start)
552 val |= 0x40;
553 *q++ = val;
554 *q++ = ts_st->pid;
555 *q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0);
556 ts_st->cc = (ts_st->cc + 1) & 0xf;
557 if (write_pcr) {
558 *q++ = 7; /* AFC length */
559 *q++ = 0x10; /* flags: PCR present */
560 *q++ = pcr >> 25;
561 *q++ = pcr >> 17;
562 *q++ = pcr >> 9;
563 *q++ = pcr >> 1;
564 *q++ = (pcr & 1) << 7;
565 *q++ = 0;
566 }
567 if (is_start) {
568 /* write PES header */
569 *q++ = 0x00;
570 *q++ = 0x00;
571 *q++ = 0x01;
572 private_code = 0;
573 if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
574 *q++ = 0xe0;
575 } else if (st->codec->codec_type == CODEC_TYPE_AUDIO &&
576 (st->codec->codec_id == CODEC_ID_MP2 ||
577 st->codec->codec_id == CODEC_ID_MP3)) {
578 *q++ = 0xc0;
579 } else {
580 *q++ = 0xbd;
581 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
582 private_code = 0x20;
583 }
584 }
585 if (pts != AV_NOPTS_VALUE)
586 header_len = 8;
587 else
588 header_len = 3;
589 if (private_code != 0)
590 header_len++;
591 len = payload_size + header_len;
592 *q++ = len >> 8;
593 *q++ = len;
594 val = 0x80;
595 /* data alignment indicator is required for subtitle data */
596 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE)
597 val |= 0x04;
598 *q++ = val;
599 if (pts != AV_NOPTS_VALUE) {
600 *q++ = 0x80; /* PTS only */
601 *q++ = 0x05; /* header len */
602 val = (0x02 << 4) |
603 (((pts >> 30) & 0x07) << 1) | 1;
604 *q++ = val;
605 val = (((pts >> 15) & 0x7fff) << 1) | 1;
606 *q++ = val >> 8;
607 *q++ = val;
608 val = (((pts) & 0x7fff) << 1) | 1;
609 *q++ = val >> 8;
610 *q++ = val;
611 } else {
612 *q++ = 0x00;
613 *q++ = 0x00;
614 }
615 if (private_code != 0)
616 *q++ = private_code;
617 is_start = 0;
618 }
619 /* header size */
620 header_len = q - buf;
621 /* data len */
622 len = TS_PACKET_SIZE - header_len;
623 if (len > payload_size)
624 len = payload_size;
625 stuffing_len = TS_PACKET_SIZE - header_len - len;
626 if (stuffing_len > 0) {
627 /* add stuffing with AFC */
628 if (buf[3] & 0x20) {
629 /* stuffing already present: increase its size */
630 afc_len = buf[4] + 1;
631 memmove(buf + 4 + afc_len + stuffing_len,
632 buf + 4 + afc_len,
633 header_len - (4 + afc_len));
634 buf[4] += stuffing_len;
635 memset(buf + 4 + afc_len, 0xff, stuffing_len);
636 } else {
637 /* add stuffing */
638 memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4);
639 buf[3] |= 0x20;
640 buf[4] = stuffing_len - 1;
641 if (stuffing_len >= 2) {
642 buf[5] = 0x00;
643 memset(buf + 6, 0xff, stuffing_len - 2);
644 }
645 }
646 }
647 memcpy(buf + TS_PACKET_SIZE - len, payload, len);
648 payload += len;
649 payload_size -= len;
650 put_buffer(&s->pb, buf, TS_PACKET_SIZE);
651 }
652 put_flush_packet(&s->pb);
653 }
654
655 static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt)
656 {
657 AVStream *st = s->streams[pkt->stream_index];
658 int size= pkt->size;
659 uint8_t *buf= pkt->data;
660 MpegTSWriteStream *ts_st = st->priv_data;
661 int len, max_payload_size;
662
663 if (st->codec->codec_type == CODEC_TYPE_SUBTITLE) {
664 /* for subtitle, a single PES packet must be generated */
665 mpegts_write_pes(s, st, buf, size, pkt->pts);
666 return 0;
667 }
668
669 max_payload_size = DEFAULT_PES_PAYLOAD_SIZE;
670 while (size > 0) {
671 len = max_payload_size - ts_st->payload_index;
672 if (len > size)
673 len = size;
674 memcpy(ts_st->payload + ts_st->payload_index, buf, len);
675 buf += len;
676 size -= len;
677 ts_st->payload_index += len;
678 if (ts_st->payload_pts == AV_NOPTS_VALUE)
679 ts_st->payload_pts = pkt->pts;
680 if (ts_st->payload_index >= max_payload_size) {
681 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
682 ts_st->payload_pts);
683 ts_st->payload_pts = AV_NOPTS_VALUE;
684 ts_st->payload_index = 0;
685 }
686 }
687 return 0;
688 }
689
690 static int mpegts_write_end(AVFormatContext *s)
691 {
692 MpegTSWrite *ts = s->priv_data;
693 MpegTSWriteStream *ts_st;
694 MpegTSService *service;
695 AVStream *st;
696 int i;
697
698 /* flush current packets */
699 for(i = 0; i < s->nb_streams; i++) {
700 st = s->streams[i];
701 ts_st = st->priv_data;
702 if (ts_st->payload_index > 0) {
703 mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index,
704 ts_st->payload_pts);
705 }
706 }
707 put_flush_packet(&s->pb);
708
709 for(i = 0; i < ts->nb_services; i++) {
710 service = ts->services[i];
711 av_freep(&service->provider_name);
712 av_freep(&service->name);
713 av_free(service);
714 }
715 av_free(ts->services);
716
717 return 0;
718 }
719
720 AVOutputFormat mpegts_mux = {
721 "mpegts",
722 "MPEG2 transport stream format",
723 "video/x-mpegts",
724 "ts",
725 sizeof(MpegTSWrite),
726 CODEC_ID_MP2,
727 CODEC_ID_MPEG2VIDEO,
728 mpegts_write_header,
729 mpegts_write_packet,
730 mpegts_write_end,
731 };