5575cccda4c342c65aeddd9af83a648221746672
[libav.git] / libavformat / mpegts.c
1 /*
2 * MPEG2 transport stream (aka DVB) demux
3 * Copyright (c) 2002-2003 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 #include "crc.h"
21 #include "mpegts.h"
22
23 //#define DEBUG_SI
24 //#define DEBUG_SEEK
25
26 /* 1.0 second at 24Mbit/s */
27 #define MAX_SCAN_PACKETS 32000
28
29 /* maximum size in which we look for synchronisation if
30 synchronisation is lost */
31 #define MAX_RESYNC_SIZE 4096
32
33 typedef struct PESContext PESContext;
34
35 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int stream_type);
36 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
37
38 enum MpegTSFilterType {
39 MPEGTS_PES,
40 MPEGTS_SECTION,
41 };
42
43 typedef void PESCallback(void *opaque, const uint8_t *buf, int len, int is_start);
44
45 typedef struct MpegTSPESFilter {
46 PESCallback *pes_cb;
47 void *opaque;
48 } MpegTSPESFilter;
49
50 typedef void SectionCallback(void *opaque, const uint8_t *buf, int len);
51
52 typedef void SetServiceCallback(void *opaque, int ret);
53
54 typedef struct MpegTSSectionFilter {
55 int section_index;
56 int section_h_size;
57 uint8_t *section_buf;
58 int check_crc:1;
59 int end_of_section_reached:1;
60 SectionCallback *section_cb;
61 void *opaque;
62 } MpegTSSectionFilter;
63
64 typedef struct MpegTSFilter {
65 int pid;
66 int last_cc; /* last cc code (-1 if first packet) */
67 enum MpegTSFilterType type;
68 union {
69 MpegTSPESFilter pes_filter;
70 MpegTSSectionFilter section_filter;
71 } u;
72 } MpegTSFilter;
73
74 typedef struct MpegTSService {
75 int running:1;
76 int sid;
77 char *provider_name;
78 char *name;
79 } MpegTSService;
80
81 struct MpegTSContext {
82 /* user data */
83 AVFormatContext *stream;
84 int raw_packet_size; /* raw packet size, including FEC if present */
85 int auto_guess; /* if true, all pids are analized to find streams */
86 int set_service_ret;
87
88 int mpeg2ts_raw; /* force raw MPEG2 transport stream output, if possible */
89 int mpeg2ts_compute_pcr; /* compute exact PCR for each transport stream packet */
90
91 /* used to estimate the exact PCR */
92 int64_t cur_pcr;
93 int pcr_incr;
94 int pcr_pid;
95
96 /* data needed to handle file based ts */
97 int stop_parse; /* stop parsing loop */
98 AVPacket *pkt; /* packet containing av data */
99
100 /******************************************/
101 /* private mpegts data */
102 /* scan context */
103 MpegTSFilter *sdt_filter;
104 int nb_services;
105 MpegTSService **services;
106
107 /* set service context (XXX: allocated it ?) */
108 SetServiceCallback *set_service_cb;
109 void *set_service_opaque;
110 MpegTSFilter *pat_filter;
111 MpegTSFilter *pmt_filter;
112 int req_sid;
113
114 MpegTSFilter *pids[NB_PID_MAX];
115 };
116
117 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
118 const uint8_t *buf, int buf_size, int is_start)
119 {
120 MpegTSSectionFilter *tss = &tss1->u.section_filter;
121 int len;
122
123 if (is_start) {
124 memcpy(tss->section_buf, buf, buf_size);
125 tss->section_index = buf_size;
126 tss->section_h_size = -1;
127 tss->end_of_section_reached = 0;
128 } else {
129 if (tss->end_of_section_reached)
130 return;
131 len = 4096 - tss->section_index;
132 if (buf_size < len)
133 len = buf_size;
134 memcpy(tss->section_buf + tss->section_index, buf, len);
135 tss->section_index += len;
136 }
137
138 /* compute section length if possible */
139 if (tss->section_h_size == -1 && tss->section_index >= 3) {
140 len = (((tss->section_buf[1] & 0xf) << 8) | tss->section_buf[2]) + 3;
141 if (len > 4096)
142 return;
143 tss->section_h_size = len;
144 }
145
146 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
147 tss->end_of_section_reached = 1;
148 if (!tss->check_crc ||
149 av_crc(av_crc04C11DB7, -1, tss->section_buf, tss->section_h_size) == 0)
150 tss->section_cb(tss->opaque, tss->section_buf, tss->section_h_size);
151 }
152 }
153
154 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
155 SectionCallback *section_cb, void *opaque,
156 int check_crc)
157
158 {
159 MpegTSFilter *filter;
160 MpegTSSectionFilter *sec;
161
162 #ifdef DEBUG_SI
163 printf("Filter: pid=0x%x\n", pid);
164 #endif
165 if (pid >= NB_PID_MAX || ts->pids[pid])
166 return NULL;
167 filter = av_mallocz(sizeof(MpegTSFilter));
168 if (!filter)
169 return NULL;
170 ts->pids[pid] = filter;
171 filter->type = MPEGTS_SECTION;
172 filter->pid = pid;
173 filter->last_cc = -1;
174 sec = &filter->u.section_filter;
175 sec->section_cb = section_cb;
176 sec->opaque = opaque;
177 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
178 sec->check_crc = check_crc;
179 if (!sec->section_buf) {
180 av_free(filter);
181 return NULL;
182 }
183 return filter;
184 }
185
186 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
187 PESCallback *pes_cb,
188 void *opaque)
189 {
190 MpegTSFilter *filter;
191 MpegTSPESFilter *pes;
192
193 if (pid >= NB_PID_MAX || ts->pids[pid])
194 return NULL;
195 filter = av_mallocz(sizeof(MpegTSFilter));
196 if (!filter)
197 return NULL;
198 ts->pids[pid] = filter;
199 filter->type = MPEGTS_PES;
200 filter->pid = pid;
201 filter->last_cc = -1;
202 pes = &filter->u.pes_filter;
203 pes->pes_cb = pes_cb;
204 pes->opaque = opaque;
205 return filter;
206 }
207
208 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
209 {
210 int pid;
211
212 pid = filter->pid;
213 if (filter->type == MPEGTS_SECTION)
214 av_freep(&filter->u.section_filter.section_buf);
215 else if (filter->type == MPEGTS_PES)
216 av_freep(&filter->u.pes_filter.opaque);
217
218 av_free(filter);
219 ts->pids[pid] = NULL;
220 }
221
222 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
223 int stat[packet_size];
224 int i;
225 int x=0;
226 int best_score=0;
227
228 memset(stat, 0, packet_size*sizeof(int));
229
230 for(x=i=0; i<size; i++){
231 if(buf[i] == 0x47){
232 stat[x]++;
233 if(stat[x] > best_score){
234 best_score= stat[x];
235 if(index) *index= x;
236 }
237 }
238
239 x++;
240 if(x == packet_size) x= 0;
241 }
242
243 return best_score;
244 }
245
246 /* autodetect fec presence. Must have at least 1024 bytes */
247 static int get_packet_size(const uint8_t *buf, int size)
248 {
249 int score, fec_score, dvhs_score;
250
251 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
252 return -1;
253
254 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
255 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
256 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
257 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
258
259 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
260 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
261 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
262 else return -1;
263 }
264
265 typedef struct SectionHeader {
266 uint8_t tid;
267 uint16_t id;
268 uint8_t version;
269 uint8_t sec_num;
270 uint8_t last_sec_num;
271 } SectionHeader;
272
273 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
274 {
275 const uint8_t *p;
276 int c;
277
278 p = *pp;
279 if (p >= p_end)
280 return -1;
281 c = *p++;
282 *pp = p;
283 return c;
284 }
285
286 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
287 {
288 const uint8_t *p;
289 int c;
290
291 p = *pp;
292 if ((p + 1) >= p_end)
293 return -1;
294 c = (p[0] << 8) | p[1];
295 p += 2;
296 *pp = p;
297 return c;
298 }
299
300 /* read and allocate a DVB string preceeded by its length */
301 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
302 {
303 int len;
304 const uint8_t *p;
305 char *str;
306
307 p = *pp;
308 len = get8(&p, p_end);
309 if (len < 0)
310 return NULL;
311 if ((p + len) > p_end)
312 return NULL;
313 str = av_malloc(len + 1);
314 if (!str)
315 return NULL;
316 memcpy(str, p, len);
317 str[len] = '\0';
318 p += len;
319 *pp = p;
320 return str;
321 }
322
323 static int parse_section_header(SectionHeader *h,
324 const uint8_t **pp, const uint8_t *p_end)
325 {
326 int val;
327
328 val = get8(pp, p_end);
329 if (val < 0)
330 return -1;
331 h->tid = val;
332 *pp += 2;
333 val = get16(pp, p_end);
334 if (val < 0)
335 return -1;
336 h->id = val;
337 val = get8(pp, p_end);
338 if (val < 0)
339 return -1;
340 h->version = (val >> 1) & 0x1f;
341 val = get8(pp, p_end);
342 if (val < 0)
343 return -1;
344 h->sec_num = val;
345 val = get8(pp, p_end);
346 if (val < 0)
347 return -1;
348 h->last_sec_num = val;
349 return 0;
350 }
351
352 static MpegTSService *new_service(MpegTSContext *ts, int sid,
353 char *provider_name, char *name)
354 {
355 MpegTSService *service;
356
357 #ifdef DEBUG_SI
358 printf("new_service: sid=0x%04x provider='%s' name='%s'\n",
359 sid, provider_name, name);
360 #endif
361
362 service = av_mallocz(sizeof(MpegTSService));
363 if (!service)
364 return NULL;
365 service->sid = sid;
366 service->provider_name = provider_name;
367 service->name = name;
368 dynarray_add(&ts->services, &ts->nb_services, service);
369 return service;
370 }
371
372 static void pmt_cb(void *opaque, const uint8_t *section, int section_len)
373 {
374 MpegTSContext *ts = opaque;
375 SectionHeader h1, *h = &h1;
376 PESContext *pes;
377 AVStream *st;
378 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
379 int program_info_length, pcr_pid, pid, stream_type;
380 int desc_list_len, desc_len, desc_tag;
381 int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
382 char language[4];
383
384 #ifdef DEBUG_SI
385 printf("PMT:\n");
386 av_hex_dump(stdout, (uint8_t *)section, section_len);
387 #endif
388 p_end = section + section_len - 4;
389 p = section;
390 if (parse_section_header(h, &p, p_end) < 0)
391 return;
392 #ifdef DEBUG_SI
393 printf("sid=0x%x sec_num=%d/%d\n", h->id, h->sec_num, h->last_sec_num);
394 #endif
395 if (h->tid != PMT_TID || (ts->req_sid >= 0 && h->id != ts->req_sid) )
396 return;
397
398 pcr_pid = get16(&p, p_end) & 0x1fff;
399 if (pcr_pid < 0)
400 return;
401 ts->pcr_pid = pcr_pid;
402 #ifdef DEBUG_SI
403 printf("pcr_pid=0x%x\n", pcr_pid);
404 #endif
405 program_info_length = get16(&p, p_end) & 0xfff;
406 if (program_info_length < 0)
407 return;
408 p += program_info_length;
409 if (p >= p_end)
410 return;
411 for(;;) {
412 language[0] = 0;
413 st = 0;
414 stream_type = get8(&p, p_end);
415 if (stream_type < 0)
416 break;
417 pid = get16(&p, p_end) & 0x1fff;
418 if (pid < 0)
419 break;
420 desc_list_len = get16(&p, p_end) & 0xfff;
421 if (desc_list_len < 0)
422 break;
423 desc_list_end = p + desc_list_len;
424 if (desc_list_end > p_end)
425 break;
426 for(;;) {
427 desc_tag = get8(&p, desc_list_end);
428 if (desc_tag < 0)
429 break;
430 if (stream_type == STREAM_TYPE_PRIVATE_DATA &&
431 ((desc_tag == 0x6A) || (desc_tag == 0x7A))) {
432 /*assume DVB AC-3 Audio*/
433 stream_type = STREAM_TYPE_AUDIO_AC3;
434 }
435 desc_len = get8(&p, desc_list_end);
436 desc_end = p + desc_len;
437 if (desc_end > desc_list_end)
438 break;
439 #ifdef DEBUG_SI
440 printf("tag: 0x%02x len=%d\n", desc_tag, desc_len);
441 #endif
442 switch(desc_tag) {
443 case DVB_SUBT_DESCID:
444 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
445 stream_type = STREAM_TYPE_SUBTITLE_DVB;
446
447 language[0] = get8(&p, desc_end);
448 language[1] = get8(&p, desc_end);
449 language[2] = get8(&p, desc_end);
450 language[3] = 0;
451 get8(&p, desc_end);
452 comp_page = get16(&p, desc_end);
453 anc_page = get16(&p, desc_end);
454
455 break;
456 case 0x0a: /* ISO 639 language descriptor */
457 language[0] = get8(&p, desc_end);
458 language[1] = get8(&p, desc_end);
459 language[2] = get8(&p, desc_end);
460 language[3] = 0;
461 break;
462 default:
463 break;
464 }
465 p = desc_end;
466 }
467 p = desc_list_end;
468
469 #ifdef DEBUG_SI
470 printf("stream_type=%d pid=0x%x\n", stream_type, pid);
471 #endif
472
473 /* now create ffmpeg stream */
474 switch(stream_type) {
475 case STREAM_TYPE_AUDIO_MPEG1:
476 case STREAM_TYPE_AUDIO_MPEG2:
477 case STREAM_TYPE_VIDEO_MPEG1:
478 case STREAM_TYPE_VIDEO_MPEG2:
479 case STREAM_TYPE_VIDEO_MPEG4:
480 case STREAM_TYPE_VIDEO_H264:
481 case STREAM_TYPE_AUDIO_AAC:
482 case STREAM_TYPE_AUDIO_AC3:
483 case STREAM_TYPE_AUDIO_DTS:
484 case STREAM_TYPE_SUBTITLE_DVB:
485 pes = add_pes_stream(ts, pid, stream_type);
486 if (pes)
487 st = new_pes_av_stream(pes, 0);
488 break;
489 default:
490 /* we ignore the other streams */
491 break;
492 }
493
494 if (st) {
495 if (language[0] != 0) {
496 st->language[0] = language[0];
497 st->language[1] = language[1];
498 st->language[2] = language[2];
499 st->language[3] = language[3];
500 }
501
502 if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
503 st->codec->sub_id = (anc_page << 16) | comp_page;
504 }
505 }
506 }
507 /* all parameters are there */
508 ts->set_service_cb(ts->set_service_opaque, 0);
509 mpegts_close_filter(ts, ts->pmt_filter);
510 ts->pmt_filter = NULL;
511 }
512
513 static void pat_cb(void *opaque, const uint8_t *section, int section_len)
514 {
515 MpegTSContext *ts = opaque;
516 SectionHeader h1, *h = &h1;
517 const uint8_t *p, *p_end;
518 int sid, pmt_pid;
519
520 #ifdef DEBUG_SI
521 printf("PAT:\n");
522 av_hex_dump(stdout, (uint8_t *)section, section_len);
523 #endif
524 p_end = section + section_len - 4;
525 p = section;
526 if (parse_section_header(h, &p, p_end) < 0)
527 return;
528 if (h->tid != PAT_TID)
529 return;
530
531 for(;;) {
532 sid = get16(&p, p_end);
533 if (sid < 0)
534 break;
535 pmt_pid = get16(&p, p_end) & 0x1fff;
536 if (pmt_pid < 0)
537 break;
538 #ifdef DEBUG_SI
539 printf("sid=0x%x pid=0x%x\n", sid, pmt_pid);
540 #endif
541 if (sid == 0x0000) {
542 /* NIT info */
543 } else {
544 if (ts->req_sid == sid) {
545 ts->pmt_filter = mpegts_open_section_filter(ts, pmt_pid,
546 pmt_cb, ts, 1);
547 goto found;
548 }
549 }
550 }
551 /* not found */
552 ts->set_service_cb(ts->set_service_opaque, -1);
553
554 found:
555 mpegts_close_filter(ts, ts->pat_filter);
556 ts->pat_filter = NULL;
557 }
558
559 /* add all services found in the PAT */
560 static void pat_scan_cb(void *opaque, const uint8_t *section, int section_len)
561 {
562 MpegTSContext *ts = opaque;
563 SectionHeader h1, *h = &h1;
564 const uint8_t *p, *p_end;
565 int sid, pmt_pid;
566 char *provider_name, *name;
567 char buf[256];
568
569 #ifdef DEBUG_SI
570 printf("PAT:\n");
571 av_hex_dump(stdout, (uint8_t *)section, section_len);
572 #endif
573 p_end = section + section_len - 4;
574 p = section;
575 if (parse_section_header(h, &p, p_end) < 0)
576 return;
577 if (h->tid != PAT_TID)
578 return;
579
580 for(;;) {
581 sid = get16(&p, p_end);
582 if (sid < 0)
583 break;
584 pmt_pid = get16(&p, p_end) & 0x1fff;
585 if (pmt_pid < 0)
586 break;
587 #ifdef DEBUG_SI
588 printf("sid=0x%x pid=0x%x\n", sid, pmt_pid);
589 #endif
590 if (sid == 0x0000) {
591 /* NIT info */
592 } else {
593 /* add the service with a dummy name */
594 snprintf(buf, sizeof(buf), "Service %x\n", sid);
595 name = av_strdup(buf);
596 provider_name = av_strdup("");
597 if (name && provider_name) {
598 new_service(ts, sid, provider_name, name);
599 } else {
600 av_freep(&name);
601 av_freep(&provider_name);
602 }
603 }
604 }
605 ts->stop_parse = 1;
606
607 /* remove filter */
608 mpegts_close_filter(ts, ts->pat_filter);
609 ts->pat_filter = NULL;
610 }
611
612 static void mpegts_set_service(MpegTSContext *ts, int sid,
613 SetServiceCallback *set_service_cb, void *opaque)
614 {
615 ts->set_service_cb = set_service_cb;
616 ts->set_service_opaque = opaque;
617 ts->req_sid = sid;
618 ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
619 pat_cb, ts, 1);
620 }
621
622 static void sdt_cb(void *opaque, const uint8_t *section, int section_len)
623 {
624 MpegTSContext *ts = opaque;
625 SectionHeader h1, *h = &h1;
626 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
627 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
628 char *name, *provider_name;
629
630 #ifdef DEBUG_SI
631 printf("SDT:\n");
632 av_hex_dump(stdout, (uint8_t *)section, section_len);
633 #endif
634
635 p_end = section + section_len - 4;
636 p = section;
637 if (parse_section_header(h, &p, p_end) < 0)
638 return;
639 if (h->tid != SDT_TID)
640 return;
641 onid = get16(&p, p_end);
642 if (onid < 0)
643 return;
644 val = get8(&p, p_end);
645 if (val < 0)
646 return;
647 for(;;) {
648 sid = get16(&p, p_end);
649 if (sid < 0)
650 break;
651 val = get8(&p, p_end);
652 if (val < 0)
653 break;
654 desc_list_len = get16(&p, p_end) & 0xfff;
655 if (desc_list_len < 0)
656 break;
657 desc_list_end = p + desc_list_len;
658 if (desc_list_end > p_end)
659 break;
660 for(;;) {
661 desc_tag = get8(&p, desc_list_end);
662 if (desc_tag < 0)
663 break;
664 desc_len = get8(&p, desc_list_end);
665 desc_end = p + desc_len;
666 if (desc_end > desc_list_end)
667 break;
668 #ifdef DEBUG_SI
669 printf("tag: 0x%02x len=%d\n", desc_tag, desc_len);
670 #endif
671 switch(desc_tag) {
672 case 0x48:
673 service_type = get8(&p, p_end);
674 if (service_type < 0)
675 break;
676 provider_name = getstr8(&p, p_end);
677 if (!provider_name)
678 break;
679 name = getstr8(&p, p_end);
680 if (!name)
681 break;
682 new_service(ts, sid, provider_name, name);
683 break;
684 default:
685 break;
686 }
687 p = desc_end;
688 }
689 p = desc_list_end;
690 }
691 ts->stop_parse = 1;
692
693 /* remove filter */
694 mpegts_close_filter(ts, ts->sdt_filter);
695 ts->sdt_filter = NULL;
696 }
697
698 /* scan services in a transport stream by looking at the SDT */
699 static void mpegts_scan_sdt(MpegTSContext *ts)
700 {
701 ts->sdt_filter = mpegts_open_section_filter(ts, SDT_PID,
702 sdt_cb, ts, 1);
703 }
704
705 /* scan services in a transport stream by looking at the PAT (better
706 than nothing !) */
707 static void mpegts_scan_pat(MpegTSContext *ts)
708 {
709 ts->pat_filter = mpegts_open_section_filter(ts, PAT_PID,
710 pat_scan_cb, ts, 1);
711 }
712
713 /* TS stream handling */
714
715 enum MpegTSState {
716 MPEGTS_HEADER = 0,
717 MPEGTS_PESHEADER_FILL,
718 MPEGTS_PAYLOAD,
719 MPEGTS_SKIP,
720 };
721
722 /* enough for PES header + length */
723 #define PES_START_SIZE 9
724 #define MAX_PES_HEADER_SIZE (9 + 255)
725
726 struct PESContext {
727 int pid;
728 int stream_type;
729 MpegTSContext *ts;
730 AVFormatContext *stream;
731 AVStream *st;
732 enum MpegTSState state;
733 /* used to get the format */
734 int data_index;
735 int total_size;
736 int pes_header_size;
737 int64_t pts, dts;
738 uint8_t header[MAX_PES_HEADER_SIZE];
739 };
740
741 static int64_t get_pts(const uint8_t *p)
742 {
743 int64_t pts;
744 int val;
745
746 pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
747 val = (p[1] << 8) | p[2];
748 pts |= (int64_t)(val >> 1) << 15;
749 val = (p[3] << 8) | p[4];
750 pts |= (int64_t)(val >> 1);
751 return pts;
752 }
753
754 /* return non zero if a packet could be constructed */
755 static void mpegts_push_data(void *opaque,
756 const uint8_t *buf, int buf_size, int is_start)
757 {
758 PESContext *pes = opaque;
759 MpegTSContext *ts = pes->ts;
760 const uint8_t *p;
761 int len, code;
762
763 if (is_start) {
764 pes->state = MPEGTS_HEADER;
765 pes->data_index = 0;
766 }
767 p = buf;
768 while (buf_size > 0) {
769 switch(pes->state) {
770 case MPEGTS_HEADER:
771 len = PES_START_SIZE - pes->data_index;
772 if (len > buf_size)
773 len = buf_size;
774 memcpy(pes->header + pes->data_index, p, len);
775 pes->data_index += len;
776 p += len;
777 buf_size -= len;
778 if (pes->data_index == PES_START_SIZE) {
779 /* we got all the PES or section header. We can now
780 decide */
781 #if 0
782 av_hex_dump(pes->header, pes->data_index);
783 #endif
784 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
785 pes->header[2] == 0x01) {
786 /* it must be an mpeg2 PES stream */
787 code = pes->header[3] | 0x100;
788 if (!((code >= 0x1c0 && code <= 0x1df) ||
789 (code >= 0x1e0 && code <= 0x1ef) ||
790 (code == 0x1bd)))
791 goto skip;
792 if (!pes->st) {
793 /* allocate stream */
794 new_pes_av_stream(pes, code);
795 }
796 pes->state = MPEGTS_PESHEADER_FILL;
797 pes->total_size = (pes->header[4] << 8) | pes->header[5];
798 /* NOTE: a zero total size means the PES size is
799 unbounded */
800 if (pes->total_size)
801 pes->total_size += 6;
802 pes->pes_header_size = pes->header[8] + 9;
803 } else {
804 /* otherwise, it should be a table */
805 /* skip packet */
806 skip:
807 pes->state = MPEGTS_SKIP;
808 continue;
809 }
810 }
811 break;
812 /**********************************************/
813 /* PES packing parsing */
814 case MPEGTS_PESHEADER_FILL:
815 len = pes->pes_header_size - pes->data_index;
816 if (len > buf_size)
817 len = buf_size;
818 memcpy(pes->header + pes->data_index, p, len);
819 pes->data_index += len;
820 p += len;
821 buf_size -= len;
822 if (pes->data_index == pes->pes_header_size) {
823 const uint8_t *r;
824 unsigned int flags;
825
826 flags = pes->header[7];
827 r = pes->header + 9;
828 pes->pts = AV_NOPTS_VALUE;
829 pes->dts = AV_NOPTS_VALUE;
830 if ((flags & 0xc0) == 0x80) {
831 pes->pts = get_pts(r);
832 r += 5;
833 } else if ((flags & 0xc0) == 0xc0) {
834 pes->pts = get_pts(r);
835 r += 5;
836 pes->dts = get_pts(r);
837 r += 5;
838 }
839 /* we got the full header. We parse it and get the payload */
840 pes->state = MPEGTS_PAYLOAD;
841 }
842 break;
843 case MPEGTS_PAYLOAD:
844 if (pes->total_size) {
845 len = pes->total_size - pes->data_index;
846 if (len > buf_size)
847 len = buf_size;
848 } else {
849 len = buf_size;
850 }
851 if (len > 0) {
852 AVPacket *pkt = ts->pkt;
853 if (pes->st && av_new_packet(pkt, len) == 0) {
854 memcpy(pkt->data, p, len);
855 pkt->stream_index = pes->st->index;
856 pkt->pts = pes->pts;
857 pkt->dts = pes->dts;
858 /* reset pts values */
859 pes->pts = AV_NOPTS_VALUE;
860 pes->dts = AV_NOPTS_VALUE;
861 ts->stop_parse = 1;
862 return;
863 }
864 }
865 buf_size = 0;
866 break;
867 case MPEGTS_SKIP:
868 buf_size = 0;
869 break;
870 }
871 }
872 }
873
874 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
875 {
876 AVStream *st;
877 int codec_type, codec_id;
878
879 switch(pes->stream_type){
880 case STREAM_TYPE_AUDIO_MPEG1:
881 case STREAM_TYPE_AUDIO_MPEG2:
882 codec_type = CODEC_TYPE_AUDIO;
883 codec_id = CODEC_ID_MP3;
884 break;
885 case STREAM_TYPE_VIDEO_MPEG1:
886 case STREAM_TYPE_VIDEO_MPEG2:
887 codec_type = CODEC_TYPE_VIDEO;
888 codec_id = CODEC_ID_MPEG2VIDEO;
889 break;
890 case STREAM_TYPE_VIDEO_MPEG4:
891 codec_type = CODEC_TYPE_VIDEO;
892 codec_id = CODEC_ID_MPEG4;
893 break;
894 case STREAM_TYPE_VIDEO_H264:
895 codec_type = CODEC_TYPE_VIDEO;
896 codec_id = CODEC_ID_H264;
897 break;
898 case STREAM_TYPE_AUDIO_AAC:
899 codec_type = CODEC_TYPE_AUDIO;
900 codec_id = CODEC_ID_AAC;
901 break;
902 case STREAM_TYPE_AUDIO_AC3:
903 codec_type = CODEC_TYPE_AUDIO;
904 codec_id = CODEC_ID_AC3;
905 break;
906 case STREAM_TYPE_AUDIO_DTS:
907 codec_type = CODEC_TYPE_AUDIO;
908 codec_id = CODEC_ID_DTS;
909 break;
910 case STREAM_TYPE_SUBTITLE_DVB:
911 codec_type = CODEC_TYPE_SUBTITLE;
912 codec_id = CODEC_ID_DVB_SUBTITLE;
913 break;
914 default:
915 if (code >= 0x1c0 && code <= 0x1df) {
916 codec_type = CODEC_TYPE_AUDIO;
917 codec_id = CODEC_ID_MP2;
918 } else if (code == 0x1bd) {
919 codec_type = CODEC_TYPE_AUDIO;
920 codec_id = CODEC_ID_AC3;
921 } else {
922 codec_type = CODEC_TYPE_VIDEO;
923 codec_id = CODEC_ID_MPEG1VIDEO;
924 }
925 break;
926 }
927 st = av_new_stream(pes->stream, pes->pid);
928 if (st) {
929 av_set_pts_info(st, 33, 1, 90000);
930 st->priv_data = pes;
931 st->codec->codec_type = codec_type;
932 st->codec->codec_id = codec_id;
933 st->need_parsing = 1;
934 pes->st = st;
935 }
936 return st;
937 }
938
939
940 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int stream_type)
941 {
942 MpegTSFilter *tss;
943 PESContext *pes;
944
945 /* if no pid found, then add a pid context */
946 pes = av_mallocz(sizeof(PESContext));
947 if (!pes)
948 return 0;
949 pes->ts = ts;
950 pes->stream = ts->stream;
951 pes->pid = pid;
952 pes->stream_type = stream_type;
953 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
954 if (!tss) {
955 av_free(pes);
956 return 0;
957 }
958 return pes;
959 }
960
961 /* handle one TS packet */
962 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
963 {
964 AVFormatContext *s = ts->stream;
965 MpegTSFilter *tss;
966 int len, pid, cc, cc_ok, afc, is_start;
967 const uint8_t *p, *p_end;
968
969 pid = ((packet[1] & 0x1f) << 8) | packet[2];
970 is_start = packet[1] & 0x40;
971 tss = ts->pids[pid];
972 if (ts->auto_guess && tss == NULL && is_start) {
973 add_pes_stream(ts, pid, 0);
974 tss = ts->pids[pid];
975 }
976 if (!tss)
977 return;
978
979 /* continuity check (currently not used) */
980 cc = (packet[3] & 0xf);
981 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
982 tss->last_cc = cc;
983
984 /* skip adaptation field */
985 afc = (packet[3] >> 4) & 3;
986 p = packet + 4;
987 if (afc == 0) /* reserved value */
988 return;
989 if (afc == 2) /* adaptation field only */
990 return;
991 if (afc == 3) {
992 /* skip adapation field */
993 p += p[0] + 1;
994 }
995 /* if past the end of packet, ignore */
996 p_end = packet + TS_PACKET_SIZE;
997 if (p >= p_end)
998 return;
999
1000 if (tss->type == MPEGTS_SECTION) {
1001 if (is_start) {
1002 /* pointer field present */
1003 len = *p++;
1004 if (p + len > p_end)
1005 return;
1006 if (len && cc_ok) {
1007 /* write remaining section bytes */
1008 write_section_data(s, tss,
1009 p, len, 0);
1010 /* check whether filter has been closed */
1011 if (!ts->pids[pid])
1012 return;
1013 }
1014 p += len;
1015 if (p < p_end) {
1016 write_section_data(s, tss,
1017 p, p_end - p, 1);
1018 }
1019 } else {
1020 if (cc_ok) {
1021 write_section_data(s, tss,
1022 p, p_end - p, 0);
1023 }
1024 }
1025 } else {
1026 tss->u.pes_filter.pes_cb(tss->u.pes_filter.opaque,
1027 p, p_end - p, is_start);
1028 }
1029 }
1030
1031 /* XXX: try to find a better synchro over several packets (use
1032 get_packet_size() ?) */
1033 static int mpegts_resync(ByteIOContext *pb)
1034 {
1035 int c, i;
1036
1037 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1038 c = url_fgetc(pb);
1039 if (c < 0)
1040 return -1;
1041 if (c == 0x47) {
1042 url_fseek(pb, -1, SEEK_CUR);
1043 return 0;
1044 }
1045 }
1046 /* no sync found */
1047 return -1;
1048 }
1049
1050 /* return -1 if error or EOF. Return 0 if OK. */
1051 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1052 {
1053 int skip, len;
1054
1055 for(;;) {
1056 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1057 if (len != TS_PACKET_SIZE)
1058 return AVERROR_IO;
1059 /* check paquet sync byte */
1060 if (buf[0] != 0x47) {
1061 /* find a new packet start */
1062 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1063 if (mpegts_resync(pb) < 0)
1064 return AVERROR_INVALIDDATA;
1065 else
1066 continue;
1067 } else {
1068 skip = raw_packet_size - TS_PACKET_SIZE;
1069 if (skip > 0)
1070 url_fskip(pb, skip);
1071 break;
1072 }
1073 }
1074 return 0;
1075 }
1076
1077 static int handle_packets(MpegTSContext *ts, int nb_packets)
1078 {
1079 AVFormatContext *s = ts->stream;
1080 ByteIOContext *pb = &s->pb;
1081 uint8_t packet[TS_PACKET_SIZE];
1082 int packet_num, ret;
1083
1084 ts->stop_parse = 0;
1085 packet_num = 0;
1086 for(;;) {
1087 if (ts->stop_parse)
1088 break;
1089 packet_num++;
1090 if (nb_packets != 0 && packet_num >= nb_packets)
1091 break;
1092 ret = read_packet(pb, packet, ts->raw_packet_size);
1093 if (ret != 0)
1094 return ret;
1095 handle_packet(ts, packet);
1096 }
1097 return 0;
1098 }
1099
1100 static int mpegts_probe(AVProbeData *p)
1101 {
1102 #if 1
1103 const int size= p->buf_size;
1104 int score, fec_score, dvhs_score;
1105 #define CHECK_COUNT 10
1106
1107 if (size < (TS_FEC_PACKET_SIZE * CHECK_COUNT))
1108 return -1;
1109
1110 score = analyze(p->buf, TS_PACKET_SIZE *CHECK_COUNT, TS_PACKET_SIZE, NULL);
1111 dvhs_score = analyze(p->buf, TS_DVHS_PACKET_SIZE *CHECK_COUNT, TS_DVHS_PACKET_SIZE, NULL);
1112 fec_score= analyze(p->buf, TS_FEC_PACKET_SIZE*CHECK_COUNT, TS_FEC_PACKET_SIZE, NULL);
1113 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1114
1115 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1116 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1117 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1118 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1119 else return -1;
1120 #else
1121 /* only use the extension for safer guess */
1122 if (match_ext(p->filename, "ts"))
1123 return AVPROBE_SCORE_MAX;
1124 else
1125 return 0;
1126 #endif
1127 }
1128
1129 void set_service_cb(void *opaque, int ret)
1130 {
1131 MpegTSContext *ts = opaque;
1132 ts->set_service_ret = ret;
1133 ts->stop_parse = 1;
1134 }
1135
1136 /* return the 90 kHz PCR and the extension for the 27 MHz PCR. return
1137 (-1) if not available */
1138 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1139 const uint8_t *packet)
1140 {
1141 int afc, len, flags;
1142 const uint8_t *p;
1143 unsigned int v;
1144
1145 afc = (packet[3] >> 4) & 3;
1146 if (afc <= 1)
1147 return -1;
1148 p = packet + 4;
1149 len = p[0];
1150 p++;
1151 if (len == 0)
1152 return -1;
1153 flags = *p++;
1154 len--;
1155 if (!(flags & 0x10))
1156 return -1;
1157 if (len < 6)
1158 return -1;
1159 v = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
1160 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1161 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1162 return 0;
1163 }
1164
1165 static int mpegts_read_header(AVFormatContext *s,
1166 AVFormatParameters *ap)
1167 {
1168 MpegTSContext *ts = s->priv_data;
1169 ByteIOContext *pb = &s->pb;
1170 uint8_t buf[1024];
1171 int len, sid, i;
1172 int64_t pos;
1173 MpegTSService *service;
1174
1175 if (ap) {
1176 ts->mpeg2ts_raw = ap->mpeg2ts_raw;
1177 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1178 }
1179
1180 /* read the first 1024 bytes to get packet size */
1181 pos = url_ftell(pb);
1182 len = get_buffer(pb, buf, sizeof(buf));
1183 if (len != sizeof(buf))
1184 goto fail;
1185 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1186 if (ts->raw_packet_size <= 0)
1187 goto fail;
1188 ts->stream = s;
1189 ts->auto_guess = 0;
1190
1191 goto_auto_guess:
1192 if (!ts->mpeg2ts_raw) {
1193 /* normal demux */
1194
1195 if (!ts->auto_guess) {
1196 ts->set_service_ret = -1;
1197
1198 /* first do a scaning to get all the services */
1199 url_fseek(pb, pos, SEEK_SET);
1200 mpegts_scan_sdt(ts);
1201
1202 handle_packets(ts, MAX_SCAN_PACKETS);
1203
1204 if (ts->nb_services <= 0) {
1205 /* no SDT found, we try to look at the PAT */
1206
1207 /* First remove the SDT filters from each PID */
1208 int i;
1209 for (i=0; i < NB_PID_MAX; i++) {
1210 if (ts->pids[i])
1211 mpegts_close_filter(ts, ts->pids[i]);
1212 }
1213 url_fseek(pb, pos, SEEK_SET);
1214 mpegts_scan_pat(ts);
1215
1216 handle_packets(ts, MAX_SCAN_PACKETS);
1217 }
1218
1219 if (ts->nb_services <= 0) {
1220 /* raw transport stream */
1221 ts->auto_guess = 1;
1222 s->ctx_flags |= AVFMTCTX_NOHEADER;
1223 goto do_pcr;
1224 }
1225
1226 /* tune to first service found */
1227 for(i=0; i<ts->nb_services && ts->set_service_ret; i++){
1228 service = ts->services[i];
1229 sid = service->sid;
1230 #ifdef DEBUG_SI
1231 printf("tuning to '%s'\n", service->name);
1232 #endif
1233
1234 /* now find the info for the first service if we found any,
1235 otherwise try to filter all PATs */
1236
1237 url_fseek(pb, pos, SEEK_SET);
1238 mpegts_set_service(ts, sid, set_service_cb, ts);
1239
1240 handle_packets(ts, MAX_SCAN_PACKETS);
1241 }
1242 /* if could not find service, exit */
1243
1244 if (ts->set_service_ret != 0) {
1245 if(ts->auto_guess)
1246 return -1;
1247 else {
1248 //let's retry with auto_guess set
1249 ts->auto_guess = 1;
1250 goto goto_auto_guess;
1251 }
1252 }
1253
1254 #ifdef DEBUG_SI
1255 printf("tuning done\n");
1256 #endif
1257 }
1258 s->ctx_flags |= AVFMTCTX_NOHEADER;
1259 } else {
1260 AVStream *st;
1261 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1262 int64_t pcrs[2], pcr_h;
1263 int packet_count[2];
1264 uint8_t packet[TS_PACKET_SIZE];
1265
1266 /* only read packets */
1267
1268 do_pcr:
1269 st = av_new_stream(s, 0);
1270 if (!st)
1271 goto fail;
1272 av_set_pts_info(st, 60, 1, 27000000);
1273 st->codec->codec_type = CODEC_TYPE_DATA;
1274 st->codec->codec_id = CODEC_ID_MPEG2TS;
1275
1276 /* we iterate until we find two PCRs to estimate the bitrate */
1277 pcr_pid = -1;
1278 nb_pcrs = 0;
1279 nb_packets = 0;
1280 for(;;) {
1281 ret = read_packet(&s->pb, packet, ts->raw_packet_size);
1282 if (ret < 0)
1283 return -1;
1284 pid = ((packet[1] & 0x1f) << 8) | packet[2];
1285 if ((pcr_pid == -1 || pcr_pid == pid) &&
1286 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1287 pcr_pid = pid;
1288 packet_count[nb_pcrs] = nb_packets;
1289 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1290 nb_pcrs++;
1291 if (nb_pcrs >= 2)
1292 break;
1293 }
1294 nb_packets++;
1295 }
1296 ts->pcr_pid = pcr_pid;
1297
1298 /* NOTE1: the bitrate is computed without the FEC */
1299 /* NOTE2: it is only the bitrate of the start of the stream */
1300 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1301 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1302 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1303 st->codec->bit_rate = s->bit_rate;
1304 st->start_time = ts->cur_pcr;
1305 #if 0
1306 printf("start=%0.3f pcr=%0.3f incr=%d\n",
1307 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1308 #endif
1309 }
1310
1311 url_fseek(pb, pos, SEEK_SET);
1312 return 0;
1313 fail:
1314 return -1;
1315 }
1316
1317 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1318
1319 static int mpegts_raw_read_packet(AVFormatContext *s,
1320 AVPacket *pkt)
1321 {
1322 MpegTSContext *ts = s->priv_data;
1323 int ret, i;
1324 int64_t pcr_h, next_pcr_h, pos;
1325 int pcr_l, next_pcr_l;
1326 uint8_t pcr_buf[12];
1327
1328 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1329 return -ENOMEM;
1330 pkt->pos= url_ftell(&s->pb);
1331 ret = read_packet(&s->pb, pkt->data, ts->raw_packet_size);
1332 if (ret < 0) {
1333 av_free_packet(pkt);
1334 return ret;
1335 }
1336 if (ts->mpeg2ts_compute_pcr) {
1337 /* compute exact PCR for each packet */
1338 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1339 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1340 pos = url_ftell(&s->pb);
1341 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1342 url_fseek(&s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1343 get_buffer(&s->pb, pcr_buf, 12);
1344 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1345 /* XXX: not precise enough */
1346 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1347 (i + 1);
1348 break;
1349 }
1350 }
1351 url_fseek(&s->pb, pos, SEEK_SET);
1352 /* no next PCR found: we use previous increment */
1353 ts->cur_pcr = pcr_h * 300 + pcr_l;
1354 }
1355 pkt->pts = ts->cur_pcr;
1356 pkt->duration = ts->pcr_incr;
1357 ts->cur_pcr += ts->pcr_incr;
1358 }
1359 pkt->stream_index = 0;
1360 return 0;
1361 }
1362
1363 static int mpegts_read_packet(AVFormatContext *s,
1364 AVPacket *pkt)
1365 {
1366 MpegTSContext *ts = s->priv_data;
1367
1368 if (!ts->mpeg2ts_raw) {
1369 ts->pkt = pkt;
1370 return handle_packets(ts, 0);
1371 } else {
1372 return mpegts_raw_read_packet(s, pkt);
1373 }
1374 }
1375
1376 static int mpegts_read_close(AVFormatContext *s)
1377 {
1378 MpegTSContext *ts = s->priv_data;
1379 int i;
1380 for(i=0;i<NB_PID_MAX;i++)
1381 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1382
1383 for(i = 0; i < ts->nb_services; i++){
1384 av_free(ts->services[i]->provider_name);
1385 av_free(ts->services[i]->name);
1386 av_free(ts->services[i]);
1387 }
1388 av_freep(&ts->services);
1389
1390 return 0;
1391 }
1392
1393 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1394 int64_t *ppos, int64_t pos_limit)
1395 {
1396 MpegTSContext *ts = s->priv_data;
1397 int64_t pos, timestamp;
1398 uint8_t buf[TS_PACKET_SIZE];
1399 int pcr_l, pid;
1400 const int find_next= 1;
1401 pos = ((*ppos + ts->raw_packet_size - 1) / ts->raw_packet_size) * ts->raw_packet_size;
1402 if (find_next) {
1403 for(;;) {
1404 url_fseek(&s->pb, pos, SEEK_SET);
1405 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1406 return AV_NOPTS_VALUE;
1407 pid = ((buf[1] & 0x1f) << 8) | buf[2];
1408 if (pid == ts->pcr_pid &&
1409 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1410 break;
1411 }
1412 pos += ts->raw_packet_size;
1413 }
1414 } else {
1415 for(;;) {
1416 pos -= ts->raw_packet_size;
1417 if (pos < 0)
1418 return AV_NOPTS_VALUE;
1419 url_fseek(&s->pb, pos, SEEK_SET);
1420 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1421 return AV_NOPTS_VALUE;
1422 pid = ((buf[1] & 0x1f) << 8) | buf[2];
1423 if (pid == ts->pcr_pid &&
1424 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1425 break;
1426 }
1427 }
1428 }
1429 *ppos = pos;
1430
1431 return timestamp;
1432 }
1433
1434 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1435 MpegTSContext *ts = s->priv_data;
1436 uint8_t buf[TS_PACKET_SIZE];
1437 int64_t pos;
1438
1439 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1440 return -1;
1441
1442 pos= url_ftell(&s->pb);
1443
1444 for(;;) {
1445 url_fseek(&s->pb, pos, SEEK_SET);
1446 if (get_buffer(&s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1447 return -1;
1448 // pid = ((buf[1] & 0x1f) << 8) | buf[2];
1449 if(buf[1] & 0x40) break;
1450 pos += ts->raw_packet_size;
1451 }
1452 url_fseek(&s->pb, pos, SEEK_SET);
1453
1454 return 0;
1455 }
1456
1457 /**************************************************************/
1458 /* parsing functions - called from other demuxers such as RTP */
1459
1460 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1461 {
1462 MpegTSContext *ts;
1463
1464 ts = av_mallocz(sizeof(MpegTSContext));
1465 if (!ts)
1466 return NULL;
1467 /* no stream case, currently used by RTP */
1468 ts->raw_packet_size = TS_PACKET_SIZE;
1469 ts->stream = s;
1470 ts->auto_guess = 1;
1471 return ts;
1472 }
1473
1474 /* return the consumed length if a packet was output, or -1 if no
1475 packet is output */
1476 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1477 const uint8_t *buf, int len)
1478 {
1479 int len1;
1480
1481 len1 = len;
1482 ts->pkt = pkt;
1483 ts->stop_parse = 0;
1484 for(;;) {
1485 if (ts->stop_parse)
1486 break;
1487 if (len < TS_PACKET_SIZE)
1488 return -1;
1489 if (buf[0] != 0x47) {
1490 buf++;
1491 len--;
1492 } else {
1493 handle_packet(ts, buf);
1494 buf += TS_PACKET_SIZE;
1495 len -= TS_PACKET_SIZE;
1496 }
1497 }
1498 return len1 - len;
1499 }
1500
1501 void mpegts_parse_close(MpegTSContext *ts)
1502 {
1503 int i;
1504
1505 for(i=0;i<NB_PID_MAX;i++)
1506 av_free(ts->pids[i]);
1507 av_free(ts);
1508 }
1509
1510 AVInputFormat mpegts_demux = {
1511 "mpegts",
1512 "MPEG2 transport stream format",
1513 sizeof(MpegTSContext),
1514 mpegts_probe,
1515 mpegts_read_header,
1516 mpegts_read_packet,
1517 mpegts_read_close,
1518 read_seek,
1519 mpegts_get_pcr,
1520 .flags = AVFMT_SHOW_IDS,
1521 };
1522
1523 int mpegts_init(void)
1524 {
1525 av_register_input_format(&mpegts_demux);
1526 #ifdef CONFIG_MUXERS
1527 av_register_output_format(&mpegts_mux);
1528 #endif
1529 return 0;
1530 }