ffmpeg / libavformat / mpegtsenc.c @ 5509bffa
History | View | Annotate | Download (23.5 KB)
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 |
}; |