ffmpeg / libavformat / mpegtsenc.c @ 445996aa
History | View | Annotate | Download (31.2 KB)
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 "libavutil/opt.h" |
25 |
#include "libavcodec/mpegvideo.h" |
26 |
#include "avformat.h" |
27 |
#include "internal.h" |
28 |
#include "mpegts.h" |
29 |
#include "adts.h" |
30 |
|
31 |
#define PCR_TIME_BASE 27000000 |
32 |
|
33 |
/* write DVB SI sections */
|
34 |
|
35 |
/*********************************************/
|
36 |
/* mpegts section writer */
|
37 |
|
38 |
typedef struct MpegTSSection { |
39 |
int pid;
|
40 |
int cc;
|
41 |
void (*write_packet)(struct MpegTSSection *s, const uint8_t *packet); |
42 |
void *opaque;
|
43 |
} MpegTSSection; |
44 |
|
45 |
typedef struct MpegTSService { |
46 |
MpegTSSection pmt; /* MPEG2 pmt table context */
|
47 |
int sid; /* service ID */ |
48 |
char *name;
|
49 |
char *provider_name;
|
50 |
int pcr_pid;
|
51 |
int pcr_packet_count;
|
52 |
int pcr_packet_period;
|
53 |
} MpegTSService; |
54 |
|
55 |
typedef struct MpegTSWrite { |
56 |
MpegTSSection pat; /* MPEG2 pat table */
|
57 |
MpegTSSection sdt; /* MPEG2 sdt table context */
|
58 |
MpegTSService **services; |
59 |
int sdt_packet_count;
|
60 |
int sdt_packet_period;
|
61 |
int pat_packet_count;
|
62 |
int pat_packet_period;
|
63 |
int nb_services;
|
64 |
int onid;
|
65 |
int tsid;
|
66 |
int64_t first_pcr; |
67 |
int mux_rate; ///< set to 1 when VBR |
68 |
|
69 |
int transport_stream_id;
|
70 |
int original_network_id;
|
71 |
int service_id;
|
72 |
|
73 |
int pmt_start_pid;
|
74 |
int start_pid;
|
75 |
} MpegTSWrite; |
76 |
|
77 |
static const AVOption options[] = { |
78 |
{ "mpegts_transport_stream_id", "Set transport_stream_id field.", |
79 |
offsetof(MpegTSWrite, transport_stream_id), FF_OPT_TYPE_INT, 0x0001, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM}, |
80 |
{ "mpegts_original_network_id", "Set original_network_id field.", |
81 |
offsetof(MpegTSWrite, original_network_id), FF_OPT_TYPE_INT, 0x0001, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM}, |
82 |
{ "mpegts_service_id", "Set service_id field.", |
83 |
offsetof(MpegTSWrite, service_id), FF_OPT_TYPE_INT, 0x0001, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM}, |
84 |
{ "mpegts_pmt_start_pid", "Set the first pid of the PMT.", |
85 |
offsetof(MpegTSWrite, pmt_start_pid), FF_OPT_TYPE_INT, 0x1000, 0x1000, 0x1f00, AV_OPT_FLAG_ENCODING_PARAM}, |
86 |
{ "mpegts_start_pid", "Set the first pid.", |
87 |
offsetof(MpegTSWrite, start_pid), FF_OPT_TYPE_INT, 0x0100, 0x0100, 0x0f00, AV_OPT_FLAG_ENCODING_PARAM}, |
88 |
{ NULL },
|
89 |
}; |
90 |
|
91 |
static const AVClass mpegts_muxer_class = { |
92 |
"MPEGTS muxer",
|
93 |
av_default_item_name, |
94 |
options, |
95 |
LIBAVUTIL_VERSION_INT, |
96 |
}; |
97 |
|
98 |
/* NOTE: 4 bytes must be left at the end for the crc32 */
|
99 |
static void mpegts_write_section(MpegTSSection *s, uint8_t *buf, int len) |
100 |
{ |
101 |
unsigned int crc; |
102 |
unsigned char packet[TS_PACKET_SIZE]; |
103 |
const unsigned char *buf_ptr; |
104 |
unsigned char *q; |
105 |
int first, b, len1, left;
|
106 |
|
107 |
crc = av_bswap32(av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, buf, len - 4)); |
108 |
buf[len - 4] = (crc >> 24) & 0xff; |
109 |
buf[len - 3] = (crc >> 16) & 0xff; |
110 |
buf[len - 2] = (crc >> 8) & 0xff; |
111 |
buf[len - 1] = (crc) & 0xff; |
112 |
|
113 |
/* send each packet */
|
114 |
buf_ptr = buf; |
115 |
while (len > 0) { |
116 |
first = (buf == buf_ptr); |
117 |
q = packet; |
118 |
*q++ = 0x47;
|
119 |
b = (s->pid >> 8);
|
120 |
if (first)
|
121 |
b |= 0x40;
|
122 |
*q++ = b; |
123 |
*q++ = s->pid; |
124 |
s->cc = (s->cc + 1) & 0xf; |
125 |
*q++ = 0x10 | s->cc;
|
126 |
if (first)
|
127 |
*q++ = 0; /* 0 offset */ |
128 |
len1 = TS_PACKET_SIZE - (q - packet); |
129 |
if (len1 > len)
|
130 |
len1 = len; |
131 |
memcpy(q, buf_ptr, len1); |
132 |
q += len1; |
133 |
/* add known padding data */
|
134 |
left = TS_PACKET_SIZE - (q - packet); |
135 |
if (left > 0) |
136 |
memset(q, 0xff, left);
|
137 |
|
138 |
s->write_packet(s, packet); |
139 |
|
140 |
buf_ptr += len1; |
141 |
len -= len1; |
142 |
} |
143 |
} |
144 |
|
145 |
static inline void put16(uint8_t **q_ptr, int val) |
146 |
{ |
147 |
uint8_t *q; |
148 |
q = *q_ptr; |
149 |
*q++ = val >> 8;
|
150 |
*q++ = val; |
151 |
*q_ptr = q; |
152 |
} |
153 |
|
154 |
static int mpegts_write_section1(MpegTSSection *s, int tid, int id, |
155 |
int version, int sec_num, int last_sec_num, |
156 |
uint8_t *buf, int len)
|
157 |
{ |
158 |
uint8_t section[1024], *q;
|
159 |
unsigned int tot_len; |
160 |
/* reserved_future_use field must be set to 1 for SDT */
|
161 |
unsigned int flags = tid == SDT_TID ? 0xf000 : 0xb000; |
162 |
|
163 |
tot_len = 3 + 5 + len + 4; |
164 |
/* check if not too big */
|
165 |
if (tot_len > 1024) |
166 |
return -1; |
167 |
|
168 |
q = section; |
169 |
*q++ = tid; |
170 |
put16(&q, flags | (len + 5 + 4)); /* 5 byte header + 4 byte CRC */ |
171 |
put16(&q, id); |
172 |
*q++ = 0xc1 | (version << 1); /* current_next_indicator = 1 */ |
173 |
*q++ = sec_num; |
174 |
*q++ = last_sec_num; |
175 |
memcpy(q, buf, len); |
176 |
|
177 |
mpegts_write_section(s, section, tot_len); |
178 |
return 0; |
179 |
} |
180 |
|
181 |
/*********************************************/
|
182 |
/* mpegts writer */
|
183 |
|
184 |
#define DEFAULT_PROVIDER_NAME "FFmpeg" |
185 |
#define DEFAULT_SERVICE_NAME "Service01" |
186 |
|
187 |
/* a PES packet header is generated every DEFAULT_PES_HEADER_FREQ packets */
|
188 |
#define DEFAULT_PES_HEADER_FREQ 16 |
189 |
#define DEFAULT_PES_PAYLOAD_SIZE ((DEFAULT_PES_HEADER_FREQ - 1) * 184 + 170) |
190 |
|
191 |
/* we retransmit the SI info at this rate */
|
192 |
#define SDT_RETRANS_TIME 500 |
193 |
#define PAT_RETRANS_TIME 100 |
194 |
#define PCR_RETRANS_TIME 20 |
195 |
|
196 |
typedef struct MpegTSWriteStream { |
197 |
struct MpegTSService *service;
|
198 |
int pid; /* stream associated pid */ |
199 |
int cc;
|
200 |
int payload_index;
|
201 |
int first_pts_check; ///< first pts check needed |
202 |
int64_t payload_pts; |
203 |
int64_t payload_dts; |
204 |
uint8_t payload[DEFAULT_PES_PAYLOAD_SIZE]; |
205 |
ADTSContext *adts; |
206 |
} MpegTSWriteStream; |
207 |
|
208 |
static void mpegts_write_pat(AVFormatContext *s) |
209 |
{ |
210 |
MpegTSWrite *ts = s->priv_data; |
211 |
MpegTSService *service; |
212 |
uint8_t data[1012], *q;
|
213 |
int i;
|
214 |
|
215 |
q = data; |
216 |
for(i = 0; i < ts->nb_services; i++) { |
217 |
service = ts->services[i]; |
218 |
put16(&q, service->sid); |
219 |
put16(&q, 0xe000 | service->pmt.pid);
|
220 |
} |
221 |
mpegts_write_section1(&ts->pat, PAT_TID, ts->tsid, 0, 0, 0, |
222 |
data, q - data); |
223 |
} |
224 |
|
225 |
static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service) |
226 |
{ |
227 |
// MpegTSWrite *ts = s->priv_data;
|
228 |
uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
|
229 |
int val, stream_type, i;
|
230 |
|
231 |
q = data; |
232 |
put16(&q, 0xe000 | service->pcr_pid);
|
233 |
|
234 |
program_info_length_ptr = q; |
235 |
q += 2; /* patched after */ |
236 |
|
237 |
/* put program info here */
|
238 |
|
239 |
val = 0xf000 | (q - program_info_length_ptr - 2); |
240 |
program_info_length_ptr[0] = val >> 8; |
241 |
program_info_length_ptr[1] = val;
|
242 |
|
243 |
for(i = 0; i < s->nb_streams; i++) { |
244 |
AVStream *st = s->streams[i]; |
245 |
MpegTSWriteStream *ts_st = st->priv_data; |
246 |
AVMetadataTag *lang = av_metadata_get(st->metadata, "language", NULL,0); |
247 |
switch(st->codec->codec_id) {
|
248 |
case CODEC_ID_MPEG1VIDEO:
|
249 |
case CODEC_ID_MPEG2VIDEO:
|
250 |
stream_type = STREAM_TYPE_VIDEO_MPEG2; |
251 |
break;
|
252 |
case CODEC_ID_MPEG4:
|
253 |
stream_type = STREAM_TYPE_VIDEO_MPEG4; |
254 |
break;
|
255 |
case CODEC_ID_H264:
|
256 |
stream_type = STREAM_TYPE_VIDEO_H264; |
257 |
break;
|
258 |
case CODEC_ID_DIRAC:
|
259 |
stream_type = STREAM_TYPE_VIDEO_DIRAC; |
260 |
break;
|
261 |
case CODEC_ID_MP2:
|
262 |
case CODEC_ID_MP3:
|
263 |
stream_type = STREAM_TYPE_AUDIO_MPEG1; |
264 |
break;
|
265 |
case CODEC_ID_AAC:
|
266 |
stream_type = STREAM_TYPE_AUDIO_AAC; |
267 |
break;
|
268 |
case CODEC_ID_AAC_LATM:
|
269 |
stream_type = STREAM_TYPE_AUDIO_AAC_LATM; |
270 |
break;
|
271 |
case CODEC_ID_AC3:
|
272 |
stream_type = STREAM_TYPE_AUDIO_AC3; |
273 |
break;
|
274 |
default:
|
275 |
stream_type = STREAM_TYPE_PRIVATE_DATA; |
276 |
break;
|
277 |
} |
278 |
*q++ = stream_type; |
279 |
put16(&q, 0xe000 | ts_st->pid);
|
280 |
desc_length_ptr = q; |
281 |
q += 2; /* patched after */ |
282 |
|
283 |
/* write optional descriptors here */
|
284 |
switch(st->codec->codec_type) {
|
285 |
case AVMEDIA_TYPE_AUDIO:
|
286 |
if (lang && strlen(lang->value) == 3) { |
287 |
*q++ = 0x0a; /* ISO 639 language descriptor */ |
288 |
*q++ = 4;
|
289 |
*q++ = lang->value[0];
|
290 |
*q++ = lang->value[1];
|
291 |
*q++ = lang->value[2];
|
292 |
*q++ = 0; /* undefined type */ |
293 |
} |
294 |
break;
|
295 |
case AVMEDIA_TYPE_SUBTITLE:
|
296 |
{ |
297 |
const char *language; |
298 |
language = lang && strlen(lang->value)==3 ? lang->value : "eng"; |
299 |
*q++ = 0x59;
|
300 |
*q++ = 8;
|
301 |
*q++ = language[0];
|
302 |
*q++ = language[1];
|
303 |
*q++ = language[2];
|
304 |
*q++ = 0x10; /* normal subtitles (0x20 = if hearing pb) */ |
305 |
if(st->codec->extradata_size == 4) { |
306 |
memcpy(q, st->codec->extradata, 4);
|
307 |
q += 4;
|
308 |
} else {
|
309 |
put16(&q, 1); /* page id */ |
310 |
put16(&q, 1); /* ancillary page id */ |
311 |
} |
312 |
} |
313 |
break;
|
314 |
case AVMEDIA_TYPE_VIDEO:
|
315 |
if (stream_type == STREAM_TYPE_VIDEO_DIRAC) {
|
316 |
*q++ = 0x05; /*MPEG-2 registration descriptor*/ |
317 |
*q++ = 4;
|
318 |
*q++ = 'd';
|
319 |
*q++ = 'r';
|
320 |
*q++ = 'a';
|
321 |
*q++ = 'c';
|
322 |
} |
323 |
break;
|
324 |
} |
325 |
|
326 |
val = 0xf000 | (q - desc_length_ptr - 2); |
327 |
desc_length_ptr[0] = val >> 8; |
328 |
desc_length_ptr[1] = val;
|
329 |
} |
330 |
mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0, |
331 |
data, q - data); |
332 |
} |
333 |
|
334 |
/* NOTE: str == NULL is accepted for an empty string */
|
335 |
static void putstr8(uint8_t **q_ptr, const char *str) |
336 |
{ |
337 |
uint8_t *q; |
338 |
int len;
|
339 |
|
340 |
q = *q_ptr; |
341 |
if (!str)
|
342 |
len = 0;
|
343 |
else
|
344 |
len = strlen(str); |
345 |
*q++ = len; |
346 |
memcpy(q, str, len); |
347 |
q += len; |
348 |
*q_ptr = q; |
349 |
} |
350 |
|
351 |
static void mpegts_write_sdt(AVFormatContext *s) |
352 |
{ |
353 |
MpegTSWrite *ts = s->priv_data; |
354 |
MpegTSService *service; |
355 |
uint8_t data[1012], *q, *desc_list_len_ptr, *desc_len_ptr;
|
356 |
int i, running_status, free_ca_mode, val;
|
357 |
|
358 |
q = data; |
359 |
put16(&q, ts->onid); |
360 |
*q++ = 0xff;
|
361 |
for(i = 0; i < ts->nb_services; i++) { |
362 |
service = ts->services[i]; |
363 |
put16(&q, service->sid); |
364 |
*q++ = 0xfc | 0x00; /* currently no EIT info */ |
365 |
desc_list_len_ptr = q; |
366 |
q += 2;
|
367 |
running_status = 4; /* running */ |
368 |
free_ca_mode = 0;
|
369 |
|
370 |
/* write only one descriptor for the service name and provider */
|
371 |
*q++ = 0x48;
|
372 |
desc_len_ptr = q; |
373 |
q++; |
374 |
*q++ = 0x01; /* digital television service */ |
375 |
putstr8(&q, service->provider_name); |
376 |
putstr8(&q, service->name); |
377 |
desc_len_ptr[0] = q - desc_len_ptr - 1; |
378 |
|
379 |
/* fill descriptor length */
|
380 |
val = (running_status << 13) | (free_ca_mode << 12) | |
381 |
(q - desc_list_len_ptr - 2);
|
382 |
desc_list_len_ptr[0] = val >> 8; |
383 |
desc_list_len_ptr[1] = val;
|
384 |
} |
385 |
mpegts_write_section1(&ts->sdt, SDT_TID, ts->tsid, 0, 0, 0, |
386 |
data, q - data); |
387 |
} |
388 |
|
389 |
static MpegTSService *mpegts_add_service(MpegTSWrite *ts,
|
390 |
int sid,
|
391 |
const char *provider_name, |
392 |
const char *name) |
393 |
{ |
394 |
MpegTSService *service; |
395 |
|
396 |
service = av_mallocz(sizeof(MpegTSService));
|
397 |
if (!service)
|
398 |
return NULL; |
399 |
service->pmt.pid = ts->pmt_start_pid + ts->nb_services; |
400 |
service->sid = sid; |
401 |
service->provider_name = av_strdup(provider_name); |
402 |
service->name = av_strdup(name); |
403 |
service->pcr_pid = 0x1fff;
|
404 |
dynarray_add(&ts->services, &ts->nb_services, service); |
405 |
return service;
|
406 |
} |
407 |
|
408 |
static void section_write_packet(MpegTSSection *s, const uint8_t *packet) |
409 |
{ |
410 |
AVFormatContext *ctx = s->opaque; |
411 |
put_buffer(ctx->pb, packet, TS_PACKET_SIZE); |
412 |
} |
413 |
|
414 |
static int mpegts_write_header(AVFormatContext *s) |
415 |
{ |
416 |
MpegTSWrite *ts = s->priv_data; |
417 |
MpegTSWriteStream *ts_st; |
418 |
MpegTSService *service; |
419 |
AVStream *st, *pcr_st = NULL;
|
420 |
AVMetadataTag *title, *provider; |
421 |
int i, j;
|
422 |
const char *service_name; |
423 |
const char *provider_name; |
424 |
int *pids;
|
425 |
|
426 |
ts->tsid = ts->transport_stream_id; |
427 |
ts->onid = ts->original_network_id; |
428 |
/* allocate a single DVB service */
|
429 |
title = av_metadata_get(s->metadata, "service_name", NULL, 0); |
430 |
if (!title)
|
431 |
title = av_metadata_get(s->metadata, "title", NULL, 0); |
432 |
service_name = title ? title->value : DEFAULT_SERVICE_NAME; |
433 |
provider = av_metadata_get(s->metadata, "service_provider", NULL, 0); |
434 |
provider_name = provider ? provider->value : DEFAULT_PROVIDER_NAME; |
435 |
service = mpegts_add_service(ts, ts->service_id, provider_name, service_name); |
436 |
service->pmt.write_packet = section_write_packet; |
437 |
service->pmt.opaque = s; |
438 |
service->pmt.cc = 15;
|
439 |
|
440 |
ts->pat.pid = PAT_PID; |
441 |
ts->pat.cc = 15; // Initialize at 15 so that it wraps and be equal to 0 for the first packet we write |
442 |
ts->pat.write_packet = section_write_packet; |
443 |
ts->pat.opaque = s; |
444 |
|
445 |
ts->sdt.pid = SDT_PID; |
446 |
ts->sdt.cc = 15;
|
447 |
ts->sdt.write_packet = section_write_packet; |
448 |
ts->sdt.opaque = s; |
449 |
|
450 |
pids = av_malloc(s->nb_streams * sizeof(*pids));
|
451 |
if (!pids)
|
452 |
return AVERROR(ENOMEM);
|
453 |
|
454 |
/* assign pids to each stream */
|
455 |
for(i = 0;i < s->nb_streams; i++) { |
456 |
st = s->streams[i]; |
457 |
ts_st = av_mallocz(sizeof(MpegTSWriteStream));
|
458 |
if (!ts_st)
|
459 |
goto fail;
|
460 |
st->priv_data = ts_st; |
461 |
ts_st->service = service; |
462 |
/* MPEG pid values < 16 are reserved. Applications which set st->id in
|
463 |
* this range are assigned a calculated pid. */
|
464 |
if (st->id < 16) { |
465 |
ts_st->pid = ts->start_pid + i; |
466 |
} else if (st->id < 0x1FFF) { |
467 |
ts_st->pid = st->id; |
468 |
} else {
|
469 |
av_log(s, AV_LOG_ERROR, "Invalid stream id %d, must be less than 8191\n", st->id);
|
470 |
goto fail;
|
471 |
} |
472 |
if (ts_st->pid == service->pmt.pid) {
|
473 |
av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
|
474 |
goto fail;
|
475 |
} |
476 |
for (j = 0; j < i; j++) |
477 |
if (pids[j] == ts_st->pid) {
|
478 |
av_log(s, AV_LOG_ERROR, "Duplicate stream id %d\n", ts_st->pid);
|
479 |
goto fail;
|
480 |
} |
481 |
pids[i] = ts_st->pid; |
482 |
ts_st->payload_pts = AV_NOPTS_VALUE; |
483 |
ts_st->payload_dts = AV_NOPTS_VALUE; |
484 |
ts_st->first_pts_check = 1;
|
485 |
ts_st->cc = 15;
|
486 |
/* update PCR pid by using the first video stream */
|
487 |
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
|
488 |
service->pcr_pid == 0x1fff) {
|
489 |
service->pcr_pid = ts_st->pid; |
490 |
pcr_st = st; |
491 |
} |
492 |
if (st->codec->codec_id == CODEC_ID_AAC &&
|
493 |
st->codec->extradata_size > 0) {
|
494 |
ts_st->adts = av_mallocz(sizeof(*ts_st->adts));
|
495 |
if (!ts_st->adts)
|
496 |
return AVERROR(ENOMEM);
|
497 |
if (ff_adts_decode_extradata(s, ts_st->adts, st->codec->extradata,
|
498 |
st->codec->extradata_size) < 0)
|
499 |
return -1; |
500 |
} |
501 |
} |
502 |
|
503 |
av_free(pids); |
504 |
|
505 |
/* if no video stream, use the first stream as PCR */
|
506 |
if (service->pcr_pid == 0x1fff && s->nb_streams > 0) { |
507 |
pcr_st = s->streams[0];
|
508 |
ts_st = pcr_st->priv_data; |
509 |
service->pcr_pid = ts_st->pid; |
510 |
} |
511 |
|
512 |
ts->mux_rate = s->mux_rate ? s->mux_rate : 1;
|
513 |
|
514 |
if (ts->mux_rate > 1) { |
515 |
service->pcr_packet_period = (ts->mux_rate * PCR_RETRANS_TIME) / |
516 |
(TS_PACKET_SIZE * 8 * 1000); |
517 |
ts->sdt_packet_period = (ts->mux_rate * SDT_RETRANS_TIME) / |
518 |
(TS_PACKET_SIZE * 8 * 1000); |
519 |
ts->pat_packet_period = (ts->mux_rate * PAT_RETRANS_TIME) / |
520 |
(TS_PACKET_SIZE * 8 * 1000); |
521 |
|
522 |
ts->first_pcr = av_rescale(s->max_delay, PCR_TIME_BASE, AV_TIME_BASE); |
523 |
} else {
|
524 |
/* Arbitrary values, PAT/PMT could be written on key frames */
|
525 |
ts->sdt_packet_period = 200;
|
526 |
ts->pat_packet_period = 40;
|
527 |
if (pcr_st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
|
528 |
if (!pcr_st->codec->frame_size) {
|
529 |
av_log(s, AV_LOG_WARNING, "frame size not set\n");
|
530 |
service->pcr_packet_period = |
531 |
pcr_st->codec->sample_rate/(10*512); |
532 |
} else {
|
533 |
service->pcr_packet_period = |
534 |
pcr_st->codec->sample_rate/(10*pcr_st->codec->frame_size);
|
535 |
} |
536 |
} else {
|
537 |
// max delta PCR 0.1s
|
538 |
service->pcr_packet_period = |
539 |
pcr_st->codec->time_base.den/(10*pcr_st->codec->time_base.num);
|
540 |
} |
541 |
} |
542 |
|
543 |
// output a PCR as soon as possible
|
544 |
service->pcr_packet_count = service->pcr_packet_period; |
545 |
ts->pat_packet_count = ts->pat_packet_period-1;
|
546 |
ts->sdt_packet_count = ts->sdt_packet_period-1;
|
547 |
|
548 |
if (ts->mux_rate == 1) |
549 |
av_log(s, AV_LOG_INFO, "muxrate VBR, ");
|
550 |
else
|
551 |
av_log(s, AV_LOG_INFO, "muxrate %d, ", ts->mux_rate);
|
552 |
av_log(s, AV_LOG_INFO, "pcr every %d pkts, "
|
553 |
"sdt every %d, pat/pmt every %d pkts\n",
|
554 |
service->pcr_packet_period, |
555 |
ts->sdt_packet_period, ts->pat_packet_period); |
556 |
|
557 |
put_flush_packet(s->pb); |
558 |
|
559 |
return 0; |
560 |
|
561 |
fail:
|
562 |
av_free(pids); |
563 |
for(i = 0;i < s->nb_streams; i++) { |
564 |
st = s->streams[i]; |
565 |
av_free(st->priv_data); |
566 |
} |
567 |
return -1; |
568 |
} |
569 |
|
570 |
/* send SDT, PAT and PMT tables regulary */
|
571 |
static void retransmit_si_info(AVFormatContext *s) |
572 |
{ |
573 |
MpegTSWrite *ts = s->priv_data; |
574 |
int i;
|
575 |
|
576 |
if (++ts->sdt_packet_count == ts->sdt_packet_period) {
|
577 |
ts->sdt_packet_count = 0;
|
578 |
mpegts_write_sdt(s); |
579 |
} |
580 |
if (++ts->pat_packet_count == ts->pat_packet_period) {
|
581 |
ts->pat_packet_count = 0;
|
582 |
mpegts_write_pat(s); |
583 |
for(i = 0; i < ts->nb_services; i++) { |
584 |
mpegts_write_pmt(s, ts->services[i]); |
585 |
} |
586 |
} |
587 |
} |
588 |
|
589 |
static int64_t get_pcr(const MpegTSWrite *ts, ByteIOContext *pb) |
590 |
{ |
591 |
return av_rescale(url_ftell(pb) + 11, 8 * PCR_TIME_BASE, ts->mux_rate) + |
592 |
ts->first_pcr; |
593 |
} |
594 |
|
595 |
static uint8_t* write_pcr_bits(uint8_t *buf, int64_t pcr)
|
596 |
{ |
597 |
int64_t pcr_low = pcr % 300, pcr_high = pcr / 300; |
598 |
|
599 |
*buf++ = pcr_high >> 25;
|
600 |
*buf++ = pcr_high >> 17;
|
601 |
*buf++ = pcr_high >> 9;
|
602 |
*buf++ = pcr_high >> 1;
|
603 |
*buf++ = pcr_high << 7 | pcr_low >> 8 | 0x7e; |
604 |
*buf++ = pcr_low; |
605 |
|
606 |
return buf;
|
607 |
} |
608 |
|
609 |
/* Write a single null transport stream packet */
|
610 |
static void mpegts_insert_null_packet(AVFormatContext *s) |
611 |
{ |
612 |
uint8_t *q; |
613 |
uint8_t buf[TS_PACKET_SIZE]; |
614 |
|
615 |
q = buf; |
616 |
*q++ = 0x47;
|
617 |
*q++ = 0x00 | 0x1f; |
618 |
*q++ = 0xff;
|
619 |
*q++ = 0x10;
|
620 |
memset(q, 0x0FF, TS_PACKET_SIZE - (q - buf));
|
621 |
put_buffer(s->pb, buf, TS_PACKET_SIZE); |
622 |
} |
623 |
|
624 |
/* Write a single transport stream packet with a PCR and no payload */
|
625 |
static void mpegts_insert_pcr_only(AVFormatContext *s, AVStream *st) |
626 |
{ |
627 |
MpegTSWrite *ts = s->priv_data; |
628 |
MpegTSWriteStream *ts_st = st->priv_data; |
629 |
uint8_t *q; |
630 |
uint8_t buf[TS_PACKET_SIZE]; |
631 |
|
632 |
q = buf; |
633 |
*q++ = 0x47;
|
634 |
*q++ = ts_st->pid >> 8;
|
635 |
*q++ = ts_st->pid; |
636 |
*q++ = 0x20 | ts_st->cc; /* Adaptation only */ |
637 |
/* Continuity Count field does not increment (see 13818-1 section 2.4.3.3) */
|
638 |
*q++ = TS_PACKET_SIZE - 5; /* Adaptation Field Length */ |
639 |
*q++ = 0x10; /* Adaptation flags: PCR present */ |
640 |
|
641 |
/* PCR coded into 6 bytes */
|
642 |
q = write_pcr_bits(q, get_pcr(ts, s->pb)); |
643 |
|
644 |
/* stuffing bytes */
|
645 |
memset(q, 0xFF, TS_PACKET_SIZE - (q - buf));
|
646 |
put_buffer(s->pb, buf, TS_PACKET_SIZE); |
647 |
} |
648 |
|
649 |
static void write_pts(uint8_t *q, int fourbits, int64_t pts) |
650 |
{ |
651 |
int val;
|
652 |
|
653 |
val = fourbits << 4 | (((pts >> 30) & 0x07) << 1) | 1; |
654 |
*q++ = val; |
655 |
val = (((pts >> 15) & 0x7fff) << 1) | 1; |
656 |
*q++ = val >> 8;
|
657 |
*q++ = val; |
658 |
val = (((pts) & 0x7fff) << 1) | 1; |
659 |
*q++ = val >> 8;
|
660 |
*q++ = val; |
661 |
} |
662 |
|
663 |
/* Add a pes header to the front of payload, and segment into an integer number of
|
664 |
* ts packets. The final ts packet is padded using an over-sized adaptation header
|
665 |
* to exactly fill the last ts packet.
|
666 |
* NOTE: 'payload' contains a complete PES payload.
|
667 |
*/
|
668 |
static void mpegts_write_pes(AVFormatContext *s, AVStream *st, |
669 |
const uint8_t *payload, int payload_size, |
670 |
int64_t pts, int64_t dts) |
671 |
{ |
672 |
MpegTSWriteStream *ts_st = st->priv_data; |
673 |
MpegTSWrite *ts = s->priv_data; |
674 |
uint8_t buf[TS_PACKET_SIZE]; |
675 |
uint8_t *q; |
676 |
int val, is_start, len, header_len, write_pcr, private_code, flags;
|
677 |
int afc_len, stuffing_len;
|
678 |
int64_t pcr = -1; /* avoid warning */ |
679 |
int64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE);
|
680 |
|
681 |
is_start = 1;
|
682 |
while (payload_size > 0) { |
683 |
retransmit_si_info(s); |
684 |
|
685 |
write_pcr = 0;
|
686 |
if (ts_st->pid == ts_st->service->pcr_pid) {
|
687 |
if (ts->mux_rate > 1 || is_start) // VBR pcr period is based on frames |
688 |
ts_st->service->pcr_packet_count++; |
689 |
if (ts_st->service->pcr_packet_count >=
|
690 |
ts_st->service->pcr_packet_period) { |
691 |
ts_st->service->pcr_packet_count = 0;
|
692 |
write_pcr = 1;
|
693 |
} |
694 |
} |
695 |
|
696 |
if (ts->mux_rate > 1 && dts != AV_NOPTS_VALUE && |
697 |
(dts - get_pcr(ts, s->pb)/300) > delay) {
|
698 |
/* pcr insert gets priority over null packet insert */
|
699 |
if (write_pcr)
|
700 |
mpegts_insert_pcr_only(s, st); |
701 |
else
|
702 |
mpegts_insert_null_packet(s); |
703 |
continue; /* recalculate write_pcr and possibly retransmit si_info */ |
704 |
} |
705 |
|
706 |
/* prepare packet header */
|
707 |
q = buf; |
708 |
*q++ = 0x47;
|
709 |
val = (ts_st->pid >> 8);
|
710 |
if (is_start)
|
711 |
val |= 0x40;
|
712 |
*q++ = val; |
713 |
*q++ = ts_st->pid; |
714 |
ts_st->cc = (ts_st->cc + 1) & 0xf; |
715 |
*q++ = 0x10 | ts_st->cc | (write_pcr ? 0x20 : 0); |
716 |
if (write_pcr) {
|
717 |
// add 11, pcr references the last byte of program clock reference base
|
718 |
if (ts->mux_rate > 1) |
719 |
pcr = get_pcr(ts, s->pb); |
720 |
else
|
721 |
pcr = (dts - delay)*300;
|
722 |
if (dts != AV_NOPTS_VALUE && dts < pcr / 300) |
723 |
av_log(s, AV_LOG_WARNING, "dts < pcr, TS is invalid\n");
|
724 |
*q++ = 7; /* AFC length */ |
725 |
*q++ = 0x10; /* flags: PCR present */ |
726 |
q = write_pcr_bits(q, pcr); |
727 |
} |
728 |
if (is_start) {
|
729 |
int pes_extension = 0; |
730 |
/* write PES header */
|
731 |
*q++ = 0x00;
|
732 |
*q++ = 0x00;
|
733 |
*q++ = 0x01;
|
734 |
private_code = 0;
|
735 |
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
|
736 |
if (st->codec->codec_id == CODEC_ID_DIRAC) {
|
737 |
*q++ = 0xfd;
|
738 |
} else
|
739 |
*q++ = 0xe0;
|
740 |
} else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && |
741 |
(st->codec->codec_id == CODEC_ID_MP2 || |
742 |
st->codec->codec_id == CODEC_ID_MP3)) { |
743 |
*q++ = 0xc0;
|
744 |
} else {
|
745 |
*q++ = 0xbd;
|
746 |
if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
|
747 |
private_code = 0x20;
|
748 |
} |
749 |
} |
750 |
header_len = 0;
|
751 |
flags = 0;
|
752 |
if (pts != AV_NOPTS_VALUE) {
|
753 |
header_len += 5;
|
754 |
flags |= 0x80;
|
755 |
} |
756 |
if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
|
757 |
header_len += 5;
|
758 |
flags |= 0x40;
|
759 |
} |
760 |
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
|
761 |
st->codec->codec_id == CODEC_ID_DIRAC) { |
762 |
/* set PES_extension_flag */
|
763 |
pes_extension = 1;
|
764 |
flags |= 0x01;
|
765 |
|
766 |
/*
|
767 |
* One byte for PES2 extension flag +
|
768 |
* one byte for extension length +
|
769 |
* one byte for extension id
|
770 |
*/
|
771 |
header_len += 3;
|
772 |
} |
773 |
len = payload_size + header_len + 3;
|
774 |
if (private_code != 0) |
775 |
len++; |
776 |
if (len > 0xffff) |
777 |
len = 0;
|
778 |
*q++ = len >> 8;
|
779 |
*q++ = len; |
780 |
val = 0x80;
|
781 |
/* data alignment indicator is required for subtitle data */
|
782 |
if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
|
783 |
val |= 0x04;
|
784 |
*q++ = val; |
785 |
*q++ = flags; |
786 |
*q++ = header_len; |
787 |
if (pts != AV_NOPTS_VALUE) {
|
788 |
write_pts(q, flags >> 6, pts);
|
789 |
q += 5;
|
790 |
} |
791 |
if (dts != AV_NOPTS_VALUE && pts != AV_NOPTS_VALUE && dts != pts) {
|
792 |
write_pts(q, 1, dts);
|
793 |
q += 5;
|
794 |
} |
795 |
if (pes_extension && st->codec->codec_id == CODEC_ID_DIRAC) {
|
796 |
flags = 0x01; /* set PES_extension_flag_2 */ |
797 |
*q++ = flags; |
798 |
*q++ = 0x80 | 0x01; /* marker bit + extension length */ |
799 |
/*
|
800 |
* Set the stream id extension flag bit to 0 and
|
801 |
* write the extended stream id
|
802 |
*/
|
803 |
*q++ = 0x00 | 0x60; |
804 |
} |
805 |
if (private_code != 0) |
806 |
*q++ = private_code; |
807 |
is_start = 0;
|
808 |
} |
809 |
/* header size */
|
810 |
header_len = q - buf; |
811 |
/* data len */
|
812 |
len = TS_PACKET_SIZE - header_len; |
813 |
if (len > payload_size)
|
814 |
len = payload_size; |
815 |
stuffing_len = TS_PACKET_SIZE - header_len - len; |
816 |
if (stuffing_len > 0) { |
817 |
/* add stuffing with AFC */
|
818 |
if (buf[3] & 0x20) { |
819 |
/* stuffing already present: increase its size */
|
820 |
afc_len = buf[4] + 1; |
821 |
memmove(buf + 4 + afc_len + stuffing_len,
|
822 |
buf + 4 + afc_len,
|
823 |
header_len - (4 + afc_len));
|
824 |
buf[4] += stuffing_len;
|
825 |
memset(buf + 4 + afc_len, 0xff, stuffing_len); |
826 |
} else {
|
827 |
/* add stuffing */
|
828 |
memmove(buf + 4 + stuffing_len, buf + 4, header_len - 4); |
829 |
buf[3] |= 0x20; |
830 |
buf[4] = stuffing_len - 1; |
831 |
if (stuffing_len >= 2) { |
832 |
buf[5] = 0x00; |
833 |
memset(buf + 6, 0xff, stuffing_len - 2); |
834 |
} |
835 |
} |
836 |
} |
837 |
memcpy(buf + TS_PACKET_SIZE - len, payload, len); |
838 |
payload += len; |
839 |
payload_size -= len; |
840 |
put_buffer(s->pb, buf, TS_PACKET_SIZE); |
841 |
} |
842 |
put_flush_packet(s->pb); |
843 |
} |
844 |
|
845 |
static int mpegts_write_packet(AVFormatContext *s, AVPacket *pkt) |
846 |
{ |
847 |
AVStream *st = s->streams[pkt->stream_index]; |
848 |
int size = pkt->size;
|
849 |
uint8_t *buf= pkt->data; |
850 |
uint8_t *data= NULL;
|
851 |
MpegTSWriteStream *ts_st = st->priv_data; |
852 |
const uint64_t delay = av_rescale(s->max_delay, 90000, AV_TIME_BASE)*2; |
853 |
int64_t dts = AV_NOPTS_VALUE, pts = AV_NOPTS_VALUE; |
854 |
|
855 |
if (pkt->pts != AV_NOPTS_VALUE)
|
856 |
pts = pkt->pts + delay; |
857 |
if (pkt->dts != AV_NOPTS_VALUE)
|
858 |
dts = pkt->dts + delay; |
859 |
|
860 |
if (ts_st->first_pts_check && pts == AV_NOPTS_VALUE) {
|
861 |
av_log(s, AV_LOG_ERROR, "first pts value must set\n");
|
862 |
return -1; |
863 |
} |
864 |
ts_st->first_pts_check = 0;
|
865 |
|
866 |
if (st->codec->codec_id == CODEC_ID_H264) {
|
867 |
const uint8_t *p = buf, *buf_end = p+size;
|
868 |
uint32_t state = -1;
|
869 |
|
870 |
if (pkt->size < 5 || AV_RB32(pkt->data) != 0x0000001) { |
871 |
av_log(s, AV_LOG_ERROR, "h264 bitstream malformated, "
|
872 |
"no startcode found, use -vbsf h264_mp4toannexb\n");
|
873 |
return -1; |
874 |
} |
875 |
|
876 |
do {
|
877 |
p = ff_find_start_code(p, buf_end, &state); |
878 |
//av_log(s, AV_LOG_INFO, "nal %d\n", state & 0x1f);
|
879 |
} while (p < buf_end && (state & 0x1f) != 9 && |
880 |
(state & 0x1f) != 5 && (state & 0x1f) != 1); |
881 |
|
882 |
if ((state & 0x1f) != 9) { // AUD NAL |
883 |
data = av_malloc(pkt->size+6);
|
884 |
if (!data)
|
885 |
return -1; |
886 |
memcpy(data+6, pkt->data, pkt->size);
|
887 |
AV_WB32(data, 0x00000001);
|
888 |
data[4] = 0x09; |
889 |
data[5] = 0xf0; // any slice type (0xe) + rbsp stop one bit |
890 |
buf = data; |
891 |
size = pkt->size+6;
|
892 |
} |
893 |
} else if (st->codec->codec_id == CODEC_ID_AAC) { |
894 |
if (pkt->size < 2) |
895 |
return -1; |
896 |
if ((AV_RB16(pkt->data) & 0xfff0) != 0xfff0) { |
897 |
ADTSContext *adts = ts_st->adts; |
898 |
int new_size;
|
899 |
if (!adts) {
|
900 |
av_log(s, AV_LOG_ERROR, "aac bitstream not in adts format "
|
901 |
"and extradata missing\n");
|
902 |
return -1; |
903 |
} |
904 |
new_size = ADTS_HEADER_SIZE+adts->pce_size+pkt->size; |
905 |
if ((unsigned)new_size >= INT_MAX) |
906 |
return -1; |
907 |
data = av_malloc(new_size); |
908 |
if (!data)
|
909 |
return AVERROR(ENOMEM);
|
910 |
ff_adts_write_frame_header(adts, data, pkt->size, adts->pce_size); |
911 |
if (adts->pce_size) {
|
912 |
memcpy(data+ADTS_HEADER_SIZE, adts->pce_data, adts->pce_size); |
913 |
adts->pce_size = 0;
|
914 |
} |
915 |
memcpy(data+ADTS_HEADER_SIZE+adts->pce_size, pkt->data, pkt->size); |
916 |
buf = data; |
917 |
size = new_size; |
918 |
} |
919 |
} |
920 |
|
921 |
if (st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
|
922 |
// for video and subtitle, write a single pes packet
|
923 |
mpegts_write_pes(s, st, buf, size, pts, dts); |
924 |
av_free(data); |
925 |
return 0; |
926 |
} |
927 |
|
928 |
if (ts_st->payload_index + size > DEFAULT_PES_PAYLOAD_SIZE) {
|
929 |
mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, |
930 |
ts_st->payload_pts, ts_st->payload_dts); |
931 |
ts_st->payload_index = 0;
|
932 |
} |
933 |
|
934 |
if (!ts_st->payload_index) {
|
935 |
ts_st->payload_pts = pts; |
936 |
ts_st->payload_dts = dts; |
937 |
} |
938 |
|
939 |
memcpy(ts_st->payload + ts_st->payload_index, buf, size); |
940 |
ts_st->payload_index += size; |
941 |
|
942 |
av_free(data); |
943 |
|
944 |
return 0; |
945 |
} |
946 |
|
947 |
static int mpegts_write_end(AVFormatContext *s) |
948 |
{ |
949 |
MpegTSWrite *ts = s->priv_data; |
950 |
MpegTSWriteStream *ts_st; |
951 |
MpegTSService *service; |
952 |
AVStream *st; |
953 |
int i;
|
954 |
|
955 |
/* flush current packets */
|
956 |
for(i = 0; i < s->nb_streams; i++) { |
957 |
st = s->streams[i]; |
958 |
ts_st = st->priv_data; |
959 |
if (ts_st->payload_index > 0) { |
960 |
mpegts_write_pes(s, st, ts_st->payload, ts_st->payload_index, |
961 |
ts_st->payload_pts, ts_st->payload_dts); |
962 |
} |
963 |
av_freep(&ts_st->adts); |
964 |
} |
965 |
put_flush_packet(s->pb); |
966 |
|
967 |
for(i = 0; i < ts->nb_services; i++) { |
968 |
service = ts->services[i]; |
969 |
av_freep(&service->provider_name); |
970 |
av_freep(&service->name); |
971 |
av_free(service); |
972 |
} |
973 |
av_free(ts->services); |
974 |
|
975 |
return 0; |
976 |
} |
977 |
|
978 |
AVOutputFormat ff_mpegts_muxer = { |
979 |
"mpegts",
|
980 |
NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
|
981 |
"video/x-mpegts",
|
982 |
"ts,m2t",
|
983 |
sizeof(MpegTSWrite),
|
984 |
CODEC_ID_MP2, |
985 |
CODEC_ID_MPEG2VIDEO, |
986 |
mpegts_write_header, |
987 |
mpegts_write_packet, |
988 |
mpegts_write_end, |
989 |
.priv_class = &mpegts_muxer_class, |
990 |
}; |