2 * MPEG2 transport stream (aka DVB) mux
3 * Copyright (c) 2003 Fabrice Bellard.
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.
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.
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
23 /* write DVB SI sections */
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
71 unsigned int mpegts_crc32(const uint8_t *data
, int len
)
74 unsigned int crc
= 0xffffffff;
77 crc
= (crc
<< 8) ^ crc_table
[((crc
>> 24) ^ *data
++) & 0xff];
82 /*********************************************/
83 /* mpegts section writer */
85 typedef struct MpegTSSection
{
88 void (*write_packet
)(struct MpegTSSection
*s
, const uint8_t *packet
);
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
)
96 unsigned char packet
[TS_PACKET_SIZE
];
97 const unsigned char *buf_ptr
;
99 int first
, b
, len1
, left
;
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;
107 /* send each packet */
110 first
= (buf
== buf_ptr
);
118 s
->cc
= (s
->cc
+ 1) & 0xf;
121 *q
++ = 0; /* 0 offset */
122 len1
= TS_PACKET_SIZE
- (q
- packet
);
125 memcpy(q
, buf_ptr
, len1
);
127 /* add known padding data */
128 left
= TS_PACKET_SIZE
- (q
- packet
);
130 memset(q
, 0xff, left
);
132 s
->write_packet(s
, packet
);
139 static inline void put16(uint8_t **q_ptr
, int val
)
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
)
152 uint8_t section
[1024], *q
;
153 unsigned int tot_len
;
155 tot_len
= 3 + 5 + len
+ 4;
156 /* check if not too big */
162 put16(&q
, 0xb000 | (len
+ 5 + 4)); /* 5 byte header + 4 byte CRC */
164 *q
++ = 0xc1 | (version
<< 1); /* current_next_indicator = 1 */
169 mpegts_write_section(s
, section
, tot_len
);
173 /*********************************************/
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"
181 /* default network id, transport stream and service identifiers */
182 #define DEFAULT_ONID 0x0001
183 #define DEFAULT_TSID 0x0001
184 #define DEFAULT_SID 0x0001
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)
190 /* we retransmit the SI info at this rate */
191 #define SDT_RETRANS_TIME 500
192 #define PAT_RETRANS_TIME 100
194 typedef struct MpegTSWriteStream
{
195 int pid
; /* stream associated pid */
199 uint8_t payload
[DEFAULT_PES_PAYLOAD_SIZE
];
202 typedef struct MpegTSService
{
203 MpegTSSection pmt
; /* MPEG2 pmt table context */
205 int sid
; /* service ID */
210 typedef struct MpegTSWrite
{
211 MpegTSSection pat
; /* MPEG2 pat table */
212 MpegTSSection sdt
; /* MPEG2 sdt table context */
213 MpegTSService
**services
;
214 int sdt_packet_count
;
216 int pat_packet_count
;
223 static void mpegts_write_pat(AVFormatContext
*s
)
225 MpegTSWrite
*ts
= s
->priv_data
;
226 MpegTSService
*service
;
227 uint8_t data
[1012], *q
;
231 for(i
= 0; i
< ts
->nb_services
; i
++) {
232 service
= ts
->services
[i
];
233 put16(&q
, service
->sid
);
234 put16(&q
, 0xe000 | service
->pmt
.pid
);
236 mpegts_write_section1(&ts
->pat
, PAT_TID
, ts
->tsid
, 0, 0, 0,
240 static void mpegts_write_pmt(AVFormatContext
*s
, MpegTSService
*service
)
242 // MpegTSWrite *ts = s->priv_data;
243 uint8_t data
[1012], *q
, *desc_length_ptr
, *program_info_length_ptr
;
244 int val
, stream_type
, i
;
247 put16(&q
, 0xe000 | service
->pcr_pid
);
249 program_info_length_ptr
= q
;
250 q
+= 2; /* patched after */
252 /* put program info here */
254 val
= 0xf000 | (q
- program_info_length_ptr
- 2);
255 program_info_length_ptr
[0] = val
>> 8;
256 program_info_length_ptr
[1] = val
;
258 for(i
= 0; i
< s
->nb_streams
; i
++) {
259 AVStream
*st
= s
->streams
[i
];
260 MpegTSWriteStream
*ts_st
= st
->priv_data
;
261 switch(st
->codec
.codec_id
) {
262 case CODEC_ID_MPEG1VIDEO
:
263 case CODEC_ID_MPEG2VIDEO
:
264 stream_type
= STREAM_TYPE_VIDEO_MPEG2
;
267 stream_type
= STREAM_TYPE_VIDEO_MPEG4
;
270 stream_type
= STREAM_TYPE_VIDEO_H264
;
274 stream_type
= STREAM_TYPE_AUDIO_MPEG1
;
277 stream_type
= STREAM_TYPE_AUDIO_AAC
;
280 stream_type
= STREAM_TYPE_AUDIO_AC3
;
283 stream_type
= STREAM_TYPE_PRIVATE_DATA
;
287 put16(&q
, 0xe000 | ts_st
->pid
);
289 q
+= 2; /* patched after */
291 /* write optional descriptors here */
293 val
= 0xf000 | (q
- desc_length_ptr
- 2);
294 desc_length_ptr
[0] = val
>> 8;
295 desc_length_ptr
[1] = val
;
297 mpegts_write_section1(&service
->pmt
, PMT_TID
, service
->sid
, 0, 0, 0,
301 /* NOTE: str == NULL is accepted for an empty string */
302 static void putstr8(uint8_t **q_ptr
, const char *str
)
318 static void mpegts_write_sdt(AVFormatContext
*s
)
320 MpegTSWrite
*ts
= s
->priv_data
;
321 MpegTSService
*service
;
322 uint8_t data
[1012], *q
, *desc_list_len_ptr
, *desc_len_ptr
;
323 int i
, running_status
, free_ca_mode
, val
;
328 for(i
= 0; i
< ts
->nb_services
; i
++) {
329 service
= ts
->services
[i
];
330 put16(&q
, service
->sid
);
331 *q
++ = 0xfc | 0x00; /* currently no EIT info */
332 desc_list_len_ptr
= q
;
334 running_status
= 4; /* running */
337 /* write only one descriptor for the service name and provider */
341 *q
++ = 0x01; /* digital television service */
342 putstr8(&q
, service
->provider_name
);
343 putstr8(&q
, service
->name
);
344 desc_len_ptr
[0] = q
- desc_len_ptr
- 1;
346 /* fill descriptor length */
347 val
= (running_status
<< 13) | (free_ca_mode
<< 12) |
348 (q
- desc_list_len_ptr
- 2);
349 desc_list_len_ptr
[0] = val
>> 8;
350 desc_list_len_ptr
[1] = val
;
352 mpegts_write_section1(&ts
->sdt
, SDT_TID
, ts
->tsid
, 0, 0, 0,
356 static MpegTSService
*mpegts_add_service(MpegTSWrite
*ts
,
358 const char *provider_name
,
361 MpegTSService
*service
;
363 service
= av_mallocz(sizeof(MpegTSService
));
366 service
->pmt
.pid
= DEFAULT_PMT_START_PID
+ ts
->nb_services
- 1;
368 service
->provider_name
= av_strdup(provider_name
);
369 service
->name
= av_strdup(name
);
370 service
->pcr_pid
= 0x1fff;
371 dynarray_add(&ts
->services
, &ts
->nb_services
, service
);
375 static void section_write_packet(MpegTSSection
*s
, const uint8_t *packet
)
377 AVFormatContext
*ctx
= s
->opaque
;
378 put_buffer(&ctx
->pb
, packet
, TS_PACKET_SIZE
);
381 static int mpegts_write_header(AVFormatContext
*s
)
383 MpegTSWrite
*ts
= s
->priv_data
;
384 MpegTSWriteStream
*ts_st
;
385 MpegTSService
*service
;
387 int i
, total_bit_rate
;
389 ts
->tsid
= DEFAULT_TSID
;
390 ts
->onid
= DEFAULT_ONID
;
391 /* allocate a single DVB service */
392 service
= mpegts_add_service(ts
, DEFAULT_SID
,
393 DEFAULT_PROVIDER_NAME
, DEFAULT_SERVICE_NAME
);
394 service
->pmt
.write_packet
= section_write_packet
;
395 service
->pmt
.opaque
= s
;
397 ts
->pat
.pid
= PAT_PID
;
399 ts
->pat
.write_packet
= section_write_packet
;
402 ts
->sdt
.pid
= SDT_PID
;
404 ts
->sdt
.write_packet
= section_write_packet
;
407 /* assign pids to each stream */
409 for(i
= 0;i
< s
->nb_streams
; i
++) {
411 ts_st
= av_mallocz(sizeof(MpegTSWriteStream
));
414 st
->priv_data
= ts_st
;
415 ts_st
->pid
= DEFAULT_START_PID
+ i
;
416 ts_st
->payload_pts
= AV_NOPTS_VALUE
;
417 /* update PCR pid if needed */
418 if (st
->codec
.codec_type
== CODEC_TYPE_VIDEO
&&
419 service
->pcr_pid
== 0x1fff)
420 service
->pcr_pid
= ts_st
->pid
;
421 total_bit_rate
+= st
->codec
.bit_rate
;
423 if (total_bit_rate
<= 8 * 1024)
424 total_bit_rate
= 8 * 1024;
425 ts
->sdt_packet_freq
= (total_bit_rate
* SDT_RETRANS_TIME
) /
426 (TS_PACKET_SIZE
* 8 * 1000);
427 ts
->pat_packet_freq
= (total_bit_rate
* PAT_RETRANS_TIME
) /
428 (TS_PACKET_SIZE
* 8 * 1000);
431 total_bit_rate
, ts
->sdt_packet_freq
, ts
->pat_packet_freq
);
434 /* write info at the start of the file, so that it will be fast to
438 for(i
= 0; i
< ts
->nb_services
; i
++) {
439 mpegts_write_pmt(s
, ts
->services
[i
]);
441 put_flush_packet(&s
->pb
);
446 for(i
= 0;i
< s
->nb_streams
; i
++) {
448 av_free(st
->priv_data
);
453 /* send SDT, PAT and PMT tables regulary */
454 static void retransmit_si_info(AVFormatContext
*s
)
456 MpegTSWrite
*ts
= s
->priv_data
;
459 if (++ts
->sdt_packet_count
== ts
->sdt_packet_freq
) {
460 ts
->sdt_packet_count
= 0;
463 if (++ts
->pat_packet_count
== ts
->pat_packet_freq
) {
464 ts
->pat_packet_count
= 0;
466 for(i
= 0; i
< ts
->nb_services
; i
++) {
467 mpegts_write_pmt(s
, ts
->services
[i
]);
472 /* NOTE: pes_data contains all the PES packet */
473 static void mpegts_write_pes(AVFormatContext
*s
, AVStream
*st
,
474 const uint8_t *payload
, int payload_size
,
477 MpegTSWriteStream
*ts_st
= st
->priv_data
;
478 uint8_t buf
[TS_PACKET_SIZE
];
480 int val
, is_start
, len
, ts_len
, header_len
;
483 while (payload_size
> 0) {
484 retransmit_si_info(s
);
486 /* prepare packet header */
489 val
= (ts_st
->pid
>> 8);
494 *q
++ = 0x10 | ts_st
->cc
;
495 ts_st
->cc
= (ts_st
->cc
+ 1) & 0xf;
497 /* write PES header */
501 if (st
->codec
.codec_type
== CODEC_TYPE_VIDEO
)
505 if (pts
!= AV_NOPTS_VALUE
)
509 len
= payload_size
+ header_len
;
513 if (pts
!= AV_NOPTS_VALUE
) {
514 *q
++ = 0x80; /* PTS only */
515 *q
++ = 0x05; /* header len */
517 (((pts
>> 30) & 0x07) << 1) | 1;
519 val
= (((pts
>> 15) & 0x7fff) << 1) | 1;
522 val
= (((pts
) & 0x7fff) << 1) | 1;
533 put_buffer(&s
->pb
, buf
, ts_len
);
535 len
= TS_PACKET_SIZE
- ts_len
;
536 if (len
> payload_size
)
538 put_buffer(&s
->pb
, payload
, len
);
543 len
= TS_PACKET_SIZE
- ts_len
;
545 memset(buf
, 0xff, len
);
546 put_buffer(&s
->pb
, buf
, len
);
549 put_flush_packet(&s
->pb
);
552 static int mpegts_write_packet(AVFormatContext
*s
, AVPacket
*pkt
)
554 AVStream
*st
= s
->streams
[pkt
->stream_index
];
556 uint8_t *buf
= pkt
->data
;
557 MpegTSWriteStream
*ts_st
= st
->priv_data
;
561 len
= DEFAULT_PES_PAYLOAD_SIZE
- ts_st
->payload_index
;
564 memcpy(ts_st
->payload
+ ts_st
->payload_index
, buf
, len
);
567 ts_st
->payload_index
+= len
;
568 if (ts_st
->payload_pts
== AV_NOPTS_VALUE
)
569 ts_st
->payload_pts
= pkt
->pts
;
570 if (ts_st
->payload_index
>= DEFAULT_PES_PAYLOAD_SIZE
) {
571 mpegts_write_pes(s
, st
, ts_st
->payload
, ts_st
->payload_index
,
573 ts_st
->payload_pts
= AV_NOPTS_VALUE
;
574 ts_st
->payload_index
= 0;
580 static int mpegts_write_end(AVFormatContext
*s
)
582 MpegTSWrite
*ts
= s
->priv_data
;
583 MpegTSWriteStream
*ts_st
;
584 MpegTSService
*service
;
588 /* flush current packets */
589 for(i
= 0; i
< s
->nb_streams
; i
++) {
591 ts_st
= st
->priv_data
;
592 if (ts_st
->payload_index
> 0) {
593 mpegts_write_pes(s
, st
, ts_st
->payload
, ts_st
->payload_index
,
597 put_flush_packet(&s
->pb
);
599 for(i
= 0; i
< ts
->nb_services
; i
++) {
600 service
= ts
->services
[i
];
601 av_freep(&service
->provider_name
);
602 av_freep(&service
->name
);
605 av_free(ts
->services
);
610 AVOutputFormat mpegts_mux
= {
612 "MPEG2 transport stream format",