2 * MPEG2 transport stream (aka DVB) muxer
3 * Copyright (c) 2003 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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 "libavcodec/internal.h"
33 #define PCR_TIME_BASE 27000000
35 /* write DVB SI sections */
37 /*********************************************/
38 /* mpegts section writer */
40 typedef struct MpegTSSection
{
43 void (*write_packet
)(struct MpegTSSection
*s
, const uint8_t *packet
);
47 typedef struct MpegTSService
{
48 MpegTSSection pmt
; /* MPEG2 pmt table context */
49 int sid
; /* service ID */
54 int pcr_packet_period
;
57 typedef struct MpegTSWrite
{
58 const AVClass
*av_class
;
59 MpegTSSection pat
; /* MPEG2 pat table */
60 MpegTSSection sdt
; /* MPEG2 sdt table context */
61 MpegTSService
**services
;
63 int sdt_packet_period
;
65 int pat_packet_period
;
70 int mux_rate
; ///< set to 1 when VBR
73 int transport_stream_id
;
74 int original_network_id
;
80 int reemit_pat_pmt
; // backward compatibility
82 #define MPEGTS_FLAG_REEMIT_PAT_PMT 0x01
83 #define MPEGTS_FLAG_AAC_LATM 0x02
87 /* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
88 #define DEFAULT_PES_HEADER_FREQ 16
89 #define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170)
91 static const AVOption options
[] = {
92 { "mpegts_transport_stream_id", "Set transport_stream_id field.",
93 offsetof(MpegTSWrite
, transport_stream_id
), AV_OPT_TYPE_INT
, {.i64
= 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM
},
94 { "mpegts_original_network_id", "Set original_network_id field.",
95 offsetof(MpegTSWrite
, original_network_id
), AV_OPT_TYPE_INT
, {.i64
= 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM
},
96 { "mpegts_service_id", "Set service_id field.",
97 offsetof(MpegTSWrite
, service_id
), AV_OPT_TYPE_INT
, {.i64
= 0x0001 }, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM
},
98 { "mpegts_pmt_start_pid", "Set the first pid of the PMT.",
99 offsetof(MpegTSWrite
, pmt_start_pid
), AV_OPT_TYPE_INT
, {.i64
= 0x1000 }, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM
},
100 { "mpegts_start_pid", "Set the first pid.",
101 offsetof(MpegTSWrite
, start_pid
), AV_OPT_TYPE_INT
, {.i64
= 0x0100 }, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM
},
102 { "muxrate", NULL
, offsetof(MpegTSWrite
, mux_rate
), AV_OPT_TYPE_INT
, {.i64
= 1}, 0, INT_MAX
, AV_OPT_FLAG_ENCODING_PARAM
},
103 { "pes_payload_size", "Minimum PES packet payload in bytes",
104 offsetof(MpegTSWrite
, pes_payload_size
), AV_OPT_TYPE_INT
, {.i64
= DEFAULT_PES_PAYLOAD_SIZE
}, 0, INT_MAX
, AV_OPT_FLAG_ENCODING_PARAM
},
105 { "mpegts_flags", "MPEG-TS muxing flags", offsetof(MpegTSWrite
, flags
), AV_OPT_TYPE_FLAGS
, {.i64
= 0}, 0, INT_MAX
,
106 AV_OPT_FLAG_ENCODING_PARAM
, "mpegts_flags" },
107 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
108 0, AV_OPT_TYPE_CONST
, {.i64
= MPEGTS_FLAG_REEMIT_PAT_PMT
}, 0, INT_MAX
,
109 AV_OPT_FLAG_ENCODING_PARAM
, "mpegts_flags"},
110 { "latm", "Use LATM packetization for AAC",
111 0, AV_OPT_TYPE_CONST
, {.i64
= MPEGTS_FLAG_AAC_LATM
}, 0, INT_MAX
,
112 AV_OPT_FLAG_ENCODING_PARAM
, "mpegts_flags"},
113 // backward compatibility
114 { "resend_headers", "Reemit PAT/PMT before writing the next packet",
115 offsetof(MpegTSWrite
, reemit_pat_pmt
), AV_OPT_TYPE_INT
, {.i64
= 0}, 0, INT_MAX
, AV_OPT_FLAG_ENCODING_PARAM
},
119 static const AVClass mpegts_muxer_class
= {
120 .class_name
= "MPEGTS muxer",
121 .item_name
= av_default_item_name
,
123 .version
= LIBAVUTIL_VERSION_INT
,
126 /* NOTE: 4 bytes must be left at the end for the crc32 */
127 static void mpegts_write_section(MpegTSSection
*s
, uint8_t *buf
, int len
)
130 unsigned char packet
[TS_PACKET_SIZE
];
131 const unsigned char *buf_ptr
;
133 int first
, b
, len1
, left
;
135 crc
= av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE
), -1, buf
, len
- 4));
136 buf
[len
- 4] = (crc
>> 24) & 0xff;
137 buf
[len
- 3] = (crc
>> 16) & 0xff;
138 buf
[len
- 2] = (crc
>> 8) & 0xff;
139 buf
[len
- 1] = (crc
) & 0xff;
141 /* send each packet */
144 first
= (buf
== buf_ptr
);
152 s
->cc
= (s
->cc
+ 1) & 0xf;
155 *q
++ = 0; /* 0 offset */
156 len1
= TS_PACKET_SIZE
- (q
- packet
);
159 memcpy(q
, buf_ptr
, len1
);
161 /* add known padding data */
162 left
= TS_PACKET_SIZE
- (q
- packet
);
164 memset(q
, 0xff, left
);
166 s
->write_packet(s
, packet
);
173 static inline void put16(uint8_t **q_ptr
, int val
)
182 static int mpegts_write_section1(MpegTSSection
*s
, int tid
, int id
,
183 int version
, int sec_num
, int last_sec_num
,
184 uint8_t *buf
, int len
)
186 uint8_t section
[1024], *q
;
187 unsigned int tot_len
;
188 /* reserved_future_use field must be set to 1 for SDT */
189 unsigned int flags
= tid
== SDT_TID ?
0xf000 : 0xb000;
191 tot_len
= 3 + 5 + len
+ 4;
192 /* check if not too big */
198 put16(&q
, flags
| (len
+ 5 + 4)); /* 5 byte header + 4 byte CRC */
200 *q
++ = 0xc1 | (version
<< 1); /* current_next_indicator = 1 */
205 mpegts_write_section(s
, section
, tot_len
);
209 /*********************************************/
212 #define DEFAULT_PROVIDER_NAME "Libav"
213 #define DEFAULT_SERVICE_NAME "Service01"
215 /* we retransmit the SI info at this rate */
216 #define SDT_RETRANS_TIME 500
217 #define PAT_RETRANS_TIME 100
218 #define PCR_RETRANS_TIME 20
220 typedef struct MpegTSWriteStream
{
221 struct MpegTSService
*service
;
222 int pid
; /* stream associated pid */
225 int first_pts_check
; ///< first pts check needed
230 AVFormatContext
*amux
;
233 static void mpegts_write_pat(AVFormatContext
*s
)
235 MpegTSWrite
*ts
= s
->priv_data
;
236 MpegTSService
*service
;
237 uint8_t data
[1012], *q
;
241 for(i
= 0; i
< ts
->nb_services
; i
++) {
242 service
= ts
->services
[i
];
243 put16(&q
, service
->sid
);
244 put16(&q
, 0xe000 | service
->pmt
.pid
);
246 mpegts_write_section1(&ts
->pat
, PAT_TID
, ts
->tsid
, 0, 0, 0,
250 static void mpegts_write_pmt(AVFormatContext
*s
, MpegTSService
*service
)
252 MpegTSWrite
*ts
= s
->priv_data
;
253 uint8_t data
[1012], *q
, *desc_length_ptr
, *program_info_length_ptr
;
254 int val
, stream_type
, i
;
257 put16(&q
, 0xe000 | service
->pcr_pid
);
259 program_info_length_ptr
= q
;
260 q
+= 2; /* patched after */
262 /* put program info here */
264 val
= 0xf000 | (q
- program_info_length_ptr
- 2);
265 program_info_length_ptr
[0] = val
>> 8;
266 program_info_length_ptr
[1] = val
;
268 for(i
= 0; i
< s
->nb_streams
; i
++) {
269 AVStream
*st
= s
->streams
[i
];
270 MpegTSWriteStream
*ts_st
= st
->priv_data
;
271 AVDictionaryEntry
*lang
= av_dict_get(st
->metadata
, "language", NULL
,0);
272 switch(st
->codec
->codec_id
) {
273 case AV_CODEC_ID_MPEG1VIDEO
:
274 case AV_CODEC_ID_MPEG2VIDEO
:
275 stream_type
= STREAM_TYPE_VIDEO_MPEG2
;
277 case AV_CODEC_ID_MPEG4
:
278 stream_type
= STREAM_TYPE_VIDEO_MPEG4
;
280 case AV_CODEC_ID_H264
:
281 stream_type
= STREAM_TYPE_VIDEO_H264
;
283 case AV_CODEC_ID_CAVS
:
284 stream_type
= STREAM_TYPE_VIDEO_CAVS
;
286 case AV_CODEC_ID_DIRAC
:
287 stream_type
= STREAM_TYPE_VIDEO_DIRAC
;
289 case AV_CODEC_ID_MP2
:
290 case AV_CODEC_ID_MP3
:
291 stream_type
= STREAM_TYPE_AUDIO_MPEG1
;
293 case AV_CODEC_ID_AAC
:
294 stream_type
= (ts
->flags
& MPEGTS_FLAG_AAC_LATM
) ? STREAM_TYPE_AUDIO_AAC_LATM
: STREAM_TYPE_AUDIO_AAC
;
296 case AV_CODEC_ID_AAC_LATM
:
297 stream_type
= STREAM_TYPE_AUDIO_AAC_LATM
;
299 case AV_CODEC_ID_AC3
:
300 stream_type
= STREAM_TYPE_AUDIO_AC3
;
303 stream_type
= STREAM_TYPE_PRIVATE_DATA
;
307 put16(&q
, 0xe000 | ts_st
->pid
);
309 q
+= 2; /* patched after */
311 /* write optional descriptors here */
312 switch(st
->codec
->codec_type
) {
313 case AVMEDIA_TYPE_AUDIO
:
316 char *next
= lang
->value
;
319 *q
++ = 0x0a; /* ISO 639 language descriptor */
323 for (p
= lang
->value
; next
&& *len_ptr
< 255 / 4 * 4; p
= next
+ 1) {
324 next
= strchr(p
, ',');
325 if (strlen(p
) != 3 && (!next
|| next
!= p
+ 3))
326 continue; /* not a 3-letter code */
332 if (st
->disposition
& AV_DISPOSITION_CLEAN_EFFECTS
)
334 else if (st
->disposition
& AV_DISPOSITION_HEARING_IMPAIRED
)
336 else if (st
->disposition
& AV_DISPOSITION_VISUAL_IMPAIRED
)
339 *q
++ = 0; /* undefined type */
345 q
-= 2; /* no language codes were written */
348 case AVMEDIA_TYPE_SUBTITLE
:
350 const char *language
;
351 language
= lang
&& strlen(lang
->value
)==3 ? lang
->value
: "eng";
357 *q
++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */
358 if(st
->codec
->extradata_size
== 4) {
359 memcpy(q
, st
->codec
->extradata
, 4);
362 put16(&q
, 1); /* page id */
363 put16(&q
, 1); /* ancillary page id */
367 case AVMEDIA_TYPE_VIDEO
:
368 if (stream_type
== STREAM_TYPE_VIDEO_DIRAC
) {
369 *q
++ = 0x05; /*MPEG-2 registration descriptor*/
379 val
= 0xf000 | (q
- desc_length_ptr
- 2);
380 desc_length_ptr
[0] = val
>> 8;
381 desc_length_ptr
[1] = val
;
383 mpegts_write_section1(&service
->pmt
, PMT_TID
, service
->sid
, 0, 0, 0,
387 /* NOTE: str == NULL is accepted for an empty string */
388 static void putstr8(uint8_t **q_ptr
, const char *str
)
404 static void mpegts_write_sdt(AVFormatContext
*s
)
406 MpegTSWrite
*ts
= s
->priv_data
;
407 MpegTSService
*service
;
408 uint8_t data
[1012], *q
, *desc_list_len_ptr
, *desc_len_ptr
;
409 int i
, running_status
, free_ca_mode
, val
;
414 for(i
= 0; i
< ts
->nb_services
; i
++) {
415 service
= ts
->services
[i
];
416 put16(&q
, service
->sid
);
417 *q
++ = 0xfc | 0x00; /* currently no EIT info */
418 desc_list_len_ptr
= q
;
420 running_status
= 4; /* running */
423 /* write only one descriptor for the service name and provider */
427 *q
++ = 0x01; /* digital television service */
428 putstr8(&q
, service
->provider_name
);
429 putstr8(&q
, service
->name
);
430 desc_len_ptr
[0] = q
- desc_len_ptr
- 1;
432 /* fill descriptor length */
433 val
= (running_status
<< 13) | (free_ca_mode
<< 12) |
434 (q
- desc_list_len_ptr
- 2);
435 desc_list_len_ptr
[0] = val
>> 8;
436 desc_list_len_ptr
[1] = val
;
438 mpegts_write_section1(&ts
->sdt
, SDT_TID
, ts
->tsid
, 0, 0, 0,
442 static MpegTSService
*mpegts_add_service(MpegTSWrite
*ts
,
444 const char *provider_name
,
447 MpegTSService
*service
;
449 service
= av_mallocz(sizeof(MpegTSService
));
452 service
->pmt
.pid
= ts
->pmt_start_pid
+ ts
->nb_services
;
454 service
->provider_name
= av_strdup(provider_name
);
455 service
->name
= av_strdup(name
);
456 service
->pcr_pid
= 0x1fff;
457 dynarray_add(&ts
->services
, &ts
->nb_services
, service
);
461 static void section_write_packet(MpegTSSection
*s
, const uint8_t *packet
)
463 AVFormatContext
*ctx
= s
->opaque
;
464 avio_write(ctx
->pb
, packet
, TS_PACKET_SIZE
);
467 static int mpegts_write_header(AVFormatContext
*s
)
469 MpegTSWrite
*ts
= s
->priv_data
;
470 MpegTSWriteStream
*ts_st
;
471 MpegTSService
*service
;
472 AVStream
*st
, *pcr_st
= NULL
;
473 AVDictionaryEntry
*title
, *provider
;
475 const char *service_name
;
476 const char *provider_name
;
480 if (s
->max_delay
< 0) /* Not set by the caller */
483 // round up to a whole number of TS packets
484 ts
->pes_payload_size
= (ts
->pes_payload_size
+ 14 + 183) / 184 * 184 - 14;
486 ts
->tsid
= ts
->transport_stream_id
;
487 ts
->onid
= ts
->original_network_id
;
488 /* allocate a single DVB service */
489 title
= av_dict_get(s
->metadata
, "service_name", NULL
, 0);
491 title
= av_dict_get(s
->metadata
, "title", NULL
, 0);
492 service_name
= title ? title
->value
: DEFAULT_SERVICE_NAME
;
493 provider
= av_dict_get(s
->metadata
, "service_provider", NULL
, 0);
494 provider_name
= provider ? provider
->value
: DEFAULT_PROVIDER_NAME
;
495 service
= mpegts_add_service(ts
, ts
->service_id
, provider_name
, service_name
);
496 service
->pmt
.write_packet
= section_write_packet
;
497 service
->pmt
.opaque
= s
;
498 service
->pmt
.cc
= 15;
500 ts
->pat
.pid
= PAT_PID
;
501 ts
->pat
.cc
= 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write
502 ts
->pat
.write_packet
= section_write_packet
;
505 ts
->sdt
.pid
= SDT_PID
;
507 ts
->sdt
.write_packet
= section_write_packet
;
510 pids
= av_malloc(s
->nb_streams
* sizeof(*pids
));
512 return AVERROR(ENOMEM
);
514 /* assign pids to each stream */
515 for(i
= 0;i
< s
->nb_streams
; i
++) {
517 avpriv_set_pts_info(st
, 33, 1, 90000);
518 ts_st
= av_mallocz(sizeof(MpegTSWriteStream
));
520 ret
= AVERROR(ENOMEM
);
523 st
->priv_data
= ts_st
;
524 ts_st
->payload
= av_mallocz(ts
->pes_payload_size
);
525 if (!ts_st
->payload
) {
526 ret
= AVERROR(ENOMEM
);
529 ts_st
->service
= service
;
530 /* MPEG pid values < 16 are reserved. Applications which set st->id in
531 * this range are assigned a calculated pid. */
533 ts_st
->pid
= ts
->start_pid
+ i
;
534 } else if (st
->id
< 0x1FFF) {
537 av_log(s
, AV_LOG_ERROR
, "Invalid stream id %d, must be less than 8191\n", st
->id
);
538 ret
= AVERROR(EINVAL
);
541 if (ts_st
->pid
== service
->pmt
.pid
) {
542 av_log(s
, AV_LOG_ERROR
, "Duplicate stream id %d\n", ts_st
->pid
);
543 ret
= AVERROR(EINVAL
);
546 for (j
= 0; j
< i
; j
++)
547 if (pids
[j
] == ts_st
->pid
) {
548 av_log(s
, AV_LOG_ERROR
, "Duplicate stream id %d\n", ts_st
->pid
);
549 ret
= AVERROR(EINVAL
);
552 pids
[i
] = ts_st
->pid
;
553 ts_st
->payload_pts
= AV_NOPTS_VALUE
;
554 ts_st
->payload_dts
= AV_NOPTS_VALUE
;
555 ts_st
->first_pts_check
= 1;
557 /* update PCR pid by using the first video stream */
558 if (st
->codec
->codec_type
== AVMEDIA_TYPE_VIDEO
&&
559 service
->pcr_pid
== 0x1fff) {
560 service
->pcr_pid
= ts_st
->pid
;
563 if (st
->codec
->codec_id
== AV_CODEC_ID_AAC
&&
564 st
->codec
->extradata_size
> 0)
567 ts_st
->amux
= avformat_alloc_context();
569 ret
= AVERROR(ENOMEM
);
572 ts_st
->amux
->oformat
= av_guess_format((ts
->flags
& MPEGTS_FLAG_AAC_LATM
) ?
"latm" : "adts", NULL
, NULL
);
573 if (!ts_st
->amux
->oformat
) {
574 ret
= AVERROR(EINVAL
);
577 ast
= avformat_new_stream(ts_st
->amux
, NULL
);
578 ret
= avcodec_copy_context(ast
->codec
, st
->codec
);
581 ret
= avformat_write_header(ts_st
->amux
, NULL
);
589 /* if no video stream, use the first stream as PCR */
590 if (service
->pcr_pid
== 0x1fff && s
->nb_streams
> 0) {
591 pcr_st
= s
->streams
[0];
592 ts_st
= pcr_st
->priv_data
;
593 service
->pcr_pid
= ts_st
->pid
;
596 if (ts
->mux_rate
> 1) {
597 service
->pcr_packet_period
= (ts
->mux_rate
* PCR_RETRANS_TIME
) /
598 (TS_PACKET_SIZE
* 8 * 1000);
599 ts
->sdt_packet_period
= (ts
->mux_rate
* SDT_RETRANS_TIME
) /
600 (TS_PACKET_SIZE
* 8 * 1000);
601 ts
->pat_packet_period
= (ts
->mux_rate
* PAT_RETRANS_TIME
) /
602 (TS_PACKET_SIZE
* 8 * 1000);
604 ts
->first_pcr
= av_rescale(s
->max_delay
, PCR_TIME_BASE
, AV_TIME_BASE
);
606 /* Arbitrary values, PAT/PMT could be written on key frames */
607 ts
->sdt_packet_period
= 200;
608 ts
->pat_packet_period
= 40;
609 if (pcr_st
->codec
->codec_type
== AVMEDIA_TYPE_AUDIO
) {
610 if (!pcr_st
->codec
->frame_size
) {
611 av_log(s
, AV_LOG_WARNING
, "frame size not set\n");
612 service
->pcr_packet_period
=
613 pcr_st
->codec
->sample_rate
/(10*512);
615 service
->pcr_packet_period
=
616 pcr_st
->codec
->sample_rate
/(10*pcr_st
->codec
->frame_size
);
619 // max delta PCR 0.1s
620 service
->pcr_packet_period
=
621 pcr_st
->codec
->time_base
.den
/(10*pcr_st
->codec
->time_base
.num
);
625 // output a PCR as soon as possible
626 service
->pcr_packet_count
= service
->pcr_packet_period
;
627 ts
->pat_packet_count
= ts
->pat_packet_period
-1;
628 ts
->sdt_packet_count
= ts
->sdt_packet_period
-1;
630 if (ts
->mux_rate
== 1)
631 av_log(s
, AV_LOG_VERBOSE
, "muxrate VBR, ");
633 av_log(s
, AV_LOG_VERBOSE
, "muxrate %d, ", ts
->mux_rate
);
634 av_log(s
, AV_LOG_VERBOSE
, "pcr every %d pkts, "
635 "sdt every %d, pat/pmt every %d pkts\n",
636 service
->pcr_packet_period
,
637 ts
->sdt_packet_period
, ts
->pat_packet_period
);
645 for(i
= 0;i
< s
->nb_streams
; i
++) {
646 MpegTSWriteStream
*ts_st
;
648 ts_st
= st
->priv_data
;
650 av_freep(&ts_st
->payload
);
652 avformat_free_context(ts_st
->amux
);
656 av_freep(&st
->priv_data
);
661 /* send SDT, PAT and PMT tables regulary */
662 static void retransmit_si_info(AVFormatContext
*s
)
664 MpegTSWrite
*ts
= s
->priv_data
;
667 if (++ts
->sdt_packet_count
== ts
->sdt_packet_period
) {
668 ts
->sdt_packet_count
= 0;
671 if (++ts
->pat_packet_count
== ts
->pat_packet_period
) {
672 ts
->pat_packet_count
= 0;
674 for(i
= 0; i
< ts
->nb_services
; i
++) {
675 mpegts_write_pmt(s
, ts
->services
[i
]);
680 static int64_t get_pcr(const MpegTSWrite
*ts
, AVIOContext
*pb
)
682 return av_rescale(avio_tell(pb
) + 11, 8 * PCR_TIME_BASE
, ts
->mux_rate
) +
686 static int write_pcr_bits(uint8_t *buf
, int64_t pcr
)
688 int64_t pcr_low
= pcr
% 300, pcr_high
= pcr
/ 300;
690 *buf
++ = pcr_high
>> 25;
691 *buf
++ = pcr_high
>> 17;
692 *buf
++ = pcr_high
>> 9;
693 *buf
++ = pcr_high
>> 1;
694 *buf
++ = pcr_high
<< 7 | pcr_low
>> 8 | 0x7e;
700 /* Write a single null transport stream packet */
701 static void mpegts_insert_null_packet(AVFormatContext
*s
)
704 uint8_t buf
[TS_PACKET_SIZE
];
711 memset(q
, 0x0FF, TS_PACKET_SIZE
- (q
- buf
));
712 avio_write(s
->pb
, buf
, TS_PACKET_SIZE
);
715 /* Write a single transport stream packet with a PCR and no payload */
716 static void mpegts_insert_pcr_only(AVFormatContext
*s
, AVStream
*st
)
718 MpegTSWrite
*ts
= s
->priv_data
;
719 MpegTSWriteStream
*ts_st
= st
->priv_data
;
721 uint8_t buf
[TS_PACKET_SIZE
];
725 *q
++ = ts_st
->pid
>> 8;
727 *q
++ = 0x20 | ts_st
->cc
; /* Adaptation only */
728 /* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
729 *q
++ = TS_PACKET_SIZE
- 5; /* Adaptation Field Length */
730 *q
++ = 0x10; /* Adaptation flags: PCR present */
732 /* PCR coded into 6 bytes */
733 q
+= write_pcr_bits(q
, get_pcr(ts
, s
->pb
));
736 memset(q
, 0xFF, TS_PACKET_SIZE
- (q
- buf
));
737 avio_write(s
->pb
, buf
, TS_PACKET_SIZE
);
740 static void write_pts(uint8_t *q
, int fourbits
, int64_t pts
)
744 val
= fourbits
<< 4 | (((pts
>> 30) & 0x07) << 1) | 1;
746 val
= (((pts
>> 15) & 0x7fff) << 1) | 1;
749 val
= (((pts
) & 0x7fff) << 1) | 1;
754 /* Set an adaptation field flag in an MPEG-TS packet*/
755 static void set_af_flag(uint8_t *pkt
, int flag
)
757 // expect at least one flag to set
760 if ((pkt
[3] & 0x20) == 0) {
761 // no AF yet, set adaptation field flag
763 // 1 byte length, no flags
770 /* Extend the adaptation field by size bytes */
771 static void extend_af(uint8_t *pkt
, int size
)
773 // expect already existing adaptation field
774 assert(pkt
[3] & 0x20);
778 /* Get a pointer to MPEG-TS payload (right after TS packet header) */
779 static uint8_t *get_ts_payload_start(uint8_t *pkt
)
782 return pkt
+ 5 + pkt
[4];
787 /* Add a pes header to the front of payload, and segment into an integer number of
788 * ts packets. The final ts packet is padded using an over-sized adaptation header
789 * to exactly fill the last ts packet.
790 * NOTE: 'payload' contains a complete PES payload.
792 static void mpegts_write_pes(AVFormatContext
*s
, AVStream
*st
,
793 const uint8_t *payload
, int payload_size
,
794 int64_t pts
, int64_t dts
, int key
)
796 MpegTSWriteStream
*ts_st
= st
->priv_data
;
797 MpegTSWrite
*ts
= s
->priv_data
;
798 uint8_t buf
[TS_PACKET_SIZE
];
800 int val
, is_start
, len
, header_len
, write_pcr
, private_code
, flags
;
801 int afc_len
, stuffing_len
;
802 int64_t pcr
= -1; /* avoid warning */
803 int64_t delay
= av_rescale(s
->max_delay
, 90000, AV_TIME_BASE
);
806 while (payload_size
> 0) {
807 retransmit_si_info(s
);
810 if (ts_st
->pid
== ts_st
->service
->pcr_pid
) {
811 if (ts
->mux_rate
> 1 || is_start
) // VBR pcr period is based on frames
812 ts_st
->service
->pcr_packet_count
++;
813 if (ts_st
->service
->pcr_packet_count
>=
814 ts_st
->service
->pcr_packet_period
) {
815 ts_st
->service
->pcr_packet_count
= 0;
820 if (ts
->mux_rate
> 1 && dts
!= AV_NOPTS_VALUE
&&
821 (dts
- get_pcr(ts
, s
->pb
)/300) > delay
) {
822 /* pcr insert gets priority over null packet insert */
824 mpegts_insert_pcr_only(s
, st
);
826 mpegts_insert_null_packet(s
);
827 continue; /* recalculate write_pcr and possibly retransmit si_info */
830 /* prepare packet header */
833 val
= (ts_st
->pid
>> 8);
838 ts_st
->cc
= (ts_st
->cc
+ 1) & 0xf;
839 *q
++ = 0x10 | ts_st
->cc
; // payload indicator + CC
840 if (key
&& is_start
&& pts
!= AV_NOPTS_VALUE
) {
841 // set Random Access for key frames
842 if (ts_st
->pid
== ts_st
->service
->pcr_pid
)
844 set_af_flag(buf
, 0x40);
845 q
= get_ts_payload_start(buf
);
848 set_af_flag(buf
, 0x10);
849 q
= get_ts_payload_start(buf
);
850 // add 11, pcr references the last byte of program clock reference base
851 if (ts
->mux_rate
> 1)
852 pcr
= get_pcr(ts
, s
->pb
);
854 pcr
= (dts
- delay
)*300;
855 if (dts
!= AV_NOPTS_VALUE
&& dts
< pcr
/ 300)
856 av_log(s
, AV_LOG_WARNING
, "dts < pcr, TS is invalid\n");
857 extend_af(buf
, write_pcr_bits(q
, pcr
));
858 q
= get_ts_payload_start(buf
);
861 int pes_extension
= 0;
862 /* write PES header */
867 if (st
->codec
->codec_type
== AVMEDIA_TYPE_VIDEO
) {
868 if (st
->codec
->codec_id
== AV_CODEC_ID_DIRAC
) {
872 } else if (st
->codec
->codec_type
== AVMEDIA_TYPE_AUDIO
&&
873 (st
->codec
->codec_id
== AV_CODEC_ID_MP2
||
874 st
->codec
->codec_id
== AV_CODEC_ID_MP3
||
875 st
->codec
->codec_id
== AV_CODEC_ID_AAC
)) {
879 if (st
->codec
->codec_type
== AVMEDIA_TYPE_SUBTITLE
) {
885 if (pts
!= AV_NOPTS_VALUE
) {
889 if (dts
!= AV_NOPTS_VALUE
&& pts
!= AV_NOPTS_VALUE
&& dts
!= pts
) {
893 if (st
->codec
->codec_type
== AVMEDIA_TYPE_VIDEO
&&
894 st
->codec
->codec_id
== AV_CODEC_ID_DIRAC
) {
895 /* set PES_extension_flag */
900 * One byte for PES2 extension flag +
901 * one byte for extension length +
902 * one byte for extension id
906 len
= payload_size
+ header_len
+ 3;
907 if (private_code
!= 0)
914 /* data alignment indicator is required for subtitle data */
915 if (st
->codec
->codec_type
== AVMEDIA_TYPE_SUBTITLE
)
920 if (pts
!= AV_NOPTS_VALUE
) {
921 write_pts(q
, flags
>> 6, pts
);
924 if (dts
!= AV_NOPTS_VALUE
&& pts
!= AV_NOPTS_VALUE
&& dts
!= pts
) {
925 write_pts(q
, 1, dts
);
928 if (pes_extension
&& st
->codec
->codec_id
== AV_CODEC_ID_DIRAC
) {
929 flags
= 0x01; /* set PES_extension_flag_2 */
931 *q
++ = 0x80 | 0x01; /* marker bit + extension length */
933 * Set the stream id extension flag bit to 0 and
934 * write the extended stream id
938 if (private_code
!= 0)
943 header_len
= q
- buf
;
945 len
= TS_PACKET_SIZE
- header_len
;
946 if (len
> payload_size
)
948 stuffing_len
= TS_PACKET_SIZE
- header_len
- len
;
949 if (stuffing_len
> 0) {
950 /* add stuffing with AFC */
952 /* stuffing already present: increase its size */
953 afc_len
= buf
[4] + 1;
954 memmove(buf
+ 4 + afc_len
+ stuffing_len
,
956 header_len
- (4 + afc_len
));
957 buf
[4] += stuffing_len
;
958 memset(buf
+ 4 + afc_len
, 0xff, stuffing_len
);
961 memmove(buf
+ 4 + stuffing_len
, buf
+ 4, header_len
- 4);
963 buf
[4] = stuffing_len
- 1;
964 if (stuffing_len
>= 2) {
966 memset(buf
+ 6, 0xff, stuffing_len
- 2);
970 memcpy(buf
+ TS_PACKET_SIZE
- len
, payload
, len
);
973 avio_write(s
->pb
, buf
, TS_PACKET_SIZE
);
978 static int mpegts_write_packet_internal(AVFormatContext
*s
, AVPacket
*pkt
)
980 AVStream
*st
= s
->streams
[pkt
->stream_index
];
981 int size
= pkt
->size
;
982 uint8_t *buf
= pkt
->data
;
984 MpegTSWrite
*ts
= s
->priv_data
;
985 MpegTSWriteStream
*ts_st
= st
->priv_data
;
986 const uint64_t delay
= av_rescale(s
->max_delay
, 90000, AV_TIME_BASE
)*2;
987 int64_t dts
= AV_NOPTS_VALUE
, pts
= AV_NOPTS_VALUE
;
989 if (ts
->reemit_pat_pmt
) {
990 av_log(s
, AV_LOG_WARNING
, "resend_headers option is deprecated, use -mpegts_flags resend_headers\n");
991 ts
->reemit_pat_pmt
= 0;
992 ts
->flags
|= MPEGTS_FLAG_REEMIT_PAT_PMT
;
995 if (ts
->flags
& MPEGTS_FLAG_REEMIT_PAT_PMT
) {
996 ts
->pat_packet_count
= ts
->pat_packet_period
- 1;
997 ts
->sdt_packet_count
= ts
->sdt_packet_period
- 1;
998 ts
->flags
&= ~MPEGTS_FLAG_REEMIT_PAT_PMT
;
1001 if (pkt
->pts
!= AV_NOPTS_VALUE
)
1002 pts
= pkt
->pts
+ delay
;
1003 if (pkt
->dts
!= AV_NOPTS_VALUE
)
1004 dts
= pkt
->dts
+ delay
;
1006 if (ts_st
->first_pts_check
&& pts
== AV_NOPTS_VALUE
) {
1007 av_log(s
, AV_LOG_ERROR
, "first pts value must set\n");
1008 return AVERROR(EINVAL
);
1010 ts_st
->first_pts_check
= 0;
1012 if (st
->codec
->codec_id
== AV_CODEC_ID_H264
) {
1013 const uint8_t *p
= buf
, *buf_end
= p
+size
;
1014 uint32_t state
= -1;
1016 if (pkt
->size
< 5 || AV_RB32(pkt
->data
) != 0x0000001) {
1017 av_log(s
, AV_LOG_ERROR
, "H.264 bitstream malformed, "
1018 "no startcode found, use -bsf h264_mp4toannexb\n");
1019 return AVERROR(EINVAL
);
1023 p
= avpriv_find_start_code(p
, buf_end
, &state
);
1024 av_dlog(s
, "nal %d\n", state
& 0x1f);
1025 } while (p
< buf_end
&& (state
& 0x1f) != 9 &&
1026 (state
& 0x1f) != 5 && (state
& 0x1f) != 1);
1028 if ((state
& 0x1f) != 9) { // AUD NAL
1029 data
= av_malloc(pkt
->size
+6);
1031 return AVERROR(ENOMEM
);
1032 memcpy(data
+6, pkt
->data
, pkt
->size
);
1033 AV_WB32(data
, 0x00000001);
1035 data
[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit
1039 } else if (st
->codec
->codec_id
== AV_CODEC_ID_AAC
) {
1040 if (pkt
->size
< 2) {
1041 av_log(s
, AV_LOG_ERROR
, "AAC packet too short\n");
1042 return AVERROR(EINVAL
);
1044 if ((AV_RB16(pkt
->data
) & 0xfff0) != 0xfff0) {
1049 av_log(s
, AV_LOG_ERROR
, "AAC bitstream not in ADTS format "
1050 "and extradata missing\n");
1051 return AVERROR(EINVAL
);
1054 av_init_packet(&pkt2
);
1055 pkt2
.data
= pkt
->data
;
1056 pkt2
.size
= pkt
->size
;
1057 ret
= avio_open_dyn_buf(&ts_st
->amux
->pb
);
1059 return AVERROR(ENOMEM
);
1061 ret
= av_write_frame(ts_st
->amux
, &pkt2
);
1063 avio_close_dyn_buf(ts_st
->amux
->pb
, &data
);
1064 ts_st
->amux
->pb
= NULL
;
1068 size
= avio_close_dyn_buf(ts_st
->amux
->pb
, &data
);
1069 ts_st
->amux
->pb
= NULL
;
1074 if (st
->codec
->codec_type
!= AVMEDIA_TYPE_AUDIO
) {
1075 // for video and subtitle, write a single pes packet
1076 mpegts_write_pes(s
, st
, buf
, size
, pts
, dts
, pkt
->flags
& AV_PKT_FLAG_KEY
);
1081 if (ts_st
->payload_size
+ size
> ts
->pes_payload_size
) {
1082 if (ts_st
->payload_size
) {
1083 mpegts_write_pes(s
, st
, ts_st
->payload
, ts_st
->payload_size
,
1084 ts_st
->payload_pts
, ts_st
->payload_dts
,
1085 ts_st
->payload_flags
& AV_PKT_FLAG_KEY
);
1086 ts_st
->payload_size
= 0;
1088 if (size
> ts
->pes_payload_size
) {
1089 mpegts_write_pes(s
, st
, buf
, size
, pts
, dts
,
1090 pkt
->flags
& AV_PKT_FLAG_KEY
);
1096 if (!ts_st
->payload_size
) {
1097 ts_st
->payload_pts
= pts
;
1098 ts_st
->payload_dts
= dts
;
1099 ts_st
->payload_flags
= pkt
->flags
;
1102 memcpy(ts_st
->payload
+ ts_st
->payload_size
, buf
, size
);
1103 ts_st
->payload_size
+= size
;
1110 static void mpegts_write_flush(AVFormatContext
*s
)
1114 /* flush current packets */
1115 for(i
= 0; i
< s
->nb_streams
; i
++) {
1116 AVStream
*st
= s
->streams
[i
];
1117 MpegTSWriteStream
*ts_st
= st
->priv_data
;
1118 if (ts_st
->payload_size
> 0) {
1119 mpegts_write_pes(s
, st
, ts_st
->payload
, ts_st
->payload_size
,
1120 ts_st
->payload_pts
, ts_st
->payload_dts
,
1121 ts_st
->payload_flags
& AV_PKT_FLAG_KEY
);
1122 ts_st
->payload_size
= 0;
1128 static int mpegts_write_packet(AVFormatContext
*s
, AVPacket
*pkt
)
1131 mpegts_write_flush(s
);
1134 return mpegts_write_packet_internal(s
, pkt
);
1138 static int mpegts_write_end(AVFormatContext
*s
)
1140 MpegTSWrite
*ts
= s
->priv_data
;
1141 MpegTSService
*service
;
1144 mpegts_write_flush(s
);
1146 for(i
= 0; i
< s
->nb_streams
; i
++) {
1147 AVStream
*st
= s
->streams
[i
];
1148 MpegTSWriteStream
*ts_st
= st
->priv_data
;
1149 av_freep(&ts_st
->payload
);
1151 avformat_free_context(ts_st
->amux
);
1156 for(i
= 0; i
< ts
->nb_services
; i
++) {
1157 service
= ts
->services
[i
];
1158 av_freep(&service
->provider_name
);
1159 av_freep(&service
->name
);
1162 av_free(ts
->services
);
1167 AVOutputFormat ff_mpegts_muxer
= {
1169 .long_name
= NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
1170 .mime_type
= "video/x-mpegts",
1171 .extensions
= "ts,m2t",
1172 .priv_data_size
= sizeof(MpegTSWrite
),
1173 .audio_codec
= AV_CODEC_ID_MP2
,
1174 .video_codec
= AV_CODEC_ID_MPEG2VIDEO
,
1175 .write_header
= mpegts_write_header
,
1176 .write_packet
= mpegts_write_packet
,
1177 .write_trailer
= mpegts_write_end
,
1178 .flags
= AVFMT_ALLOW_FLUSH
,
1179 .priv_class
= &mpegts_muxer_class
,