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cosmetics: line wrap and vertical alignment
[FFMpeg-mirror/lagarith.git] / libavformat / mpegts.c
blob67b0a6f5bec2db611bf0a657c70c520affca731d
1 /*
2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 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/crc.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavcodec/bytestream.h"
25 #include "avformat.h"
26 #include "mpegts.h"
27 #include "internal.h"
28
29 //#define DEBUG
30 //#define DEBUG_SEEK
31
32 /* 1.0 second at 24Mbit/s */
33 #define MAX_SCAN_PACKETS 32000
34
35 /* maximum size in which we look for synchronisation if
36 synchronisation is lost */
37 #define MAX_RESYNC_SIZE 4096
38 #define REGISTRATION_DESCRIPTOR 5
39
40 typedef struct PESContext PESContext;
41
42 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
43 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code);
44
45 enum MpegTSFilterType {
46 MPEGTS_PES,
47 MPEGTS_SECTION,
48 };
49
50 typedef struct MpegTSFilter MpegTSFilter;
51
52 typedef void PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
53
54 typedef struct MpegTSPESFilter {
55 PESCallback *pes_cb;
56 void *opaque;
57 } MpegTSPESFilter;
58
59 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
60
61 typedef void SetServiceCallback(void *opaque, int ret);
62
63 typedef struct MpegTSSectionFilter {
64 int section_index;
65 int section_h_size;
66 uint8_t *section_buf;
67 unsigned int check_crc:1;
68 unsigned int end_of_section_reached:1;
69 SectionCallback *section_cb;
70 void *opaque;
71 } MpegTSSectionFilter;
72
73 struct MpegTSFilter {
74 int pid;
75 int last_cc; /* last cc code (-1 if first packet) */
76 enum MpegTSFilterType type;
77 union {
78 MpegTSPESFilter pes_filter;
79 MpegTSSectionFilter section_filter;
80 } u;
81 };
82
83 #define MAX_PIDS_PER_PROGRAM 64
84 struct Program {
85 unsigned int id; //program id/service id
86 unsigned int nb_pids;
87 unsigned int pids[MAX_PIDS_PER_PROGRAM];
88 };
89
90 struct MpegTSContext {
91 /* user data */
92 AVFormatContext *stream;
93 /** raw packet size, including FEC if present */
94 int raw_packet_size;
95
96 int pos47;
97
98 /** if true, all pids are analyzed to find streams */
99 int auto_guess;
100
101 /** compute exact PCR for each transport stream packet */
102 int mpeg2ts_compute_pcr;
103
104 int64_t cur_pcr; /**< used to estimate the exact PCR */
105 int pcr_incr; /**< used to estimate the exact PCR */
106
107 /* data needed to handle file based ts */
108 /** stop parsing loop */
109 int stop_parse;
110 /** packet containing Audio/Video data */
111 AVPacket *pkt;
112
113 /******************************************/
114 /* private mpegts data */
115 /* scan context */
116 /** structure to keep track of Program->pids mapping */
117 unsigned int nb_prg;
118 struct Program *prg;
119
120
121 /** filters for various streams specified by PMT + for the PAT and PMT */
122 MpegTSFilter *pids[NB_PID_MAX];
123 };
124
125 /* TS stream handling */
126
127 enum MpegTSState {
128 MPEGTS_HEADER = 0,
129 MPEGTS_PESHEADER_FILL,
130 MPEGTS_PAYLOAD,
131 MPEGTS_SKIP,
132 };
133
134 /* enough for PES header + length */
135 #define PES_START_SIZE 9
136 #define MAX_PES_HEADER_SIZE (9 + 255)
137
138 struct PESContext {
139 int pid;
140 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
141 int stream_type;
142 MpegTSContext *ts;
143 AVFormatContext *stream;
144 AVStream *st;
145 enum MpegTSState state;
146 /* used to get the format */
147 int data_index;
148 int total_size;
149 int pes_header_size;
150 int64_t pts, dts;
151 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
152 uint8_t header[MAX_PES_HEADER_SIZE];
153 };
154
155 extern AVInputFormat mpegts_demuxer;
156
157 static void clear_program(MpegTSContext *ts, unsigned int programid)
158 {
159 int i;
160
161 for(i=0; i<ts->nb_prg; i++)
162 if(ts->prg[i].id == programid)
163 ts->prg[i].nb_pids = 0;
164 }
165
166 static void clear_programs(MpegTSContext *ts)
167 {
168 av_freep(&ts->prg);
169 ts->nb_prg=0;
170 }
171
172 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
173 {
174 struct Program *p;
175 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
176 if(!tmp)
177 return;
178 ts->prg = tmp;
179 p = &ts->prg[ts->nb_prg];
180 p->id = programid;
181 p->nb_pids = 0;
182 ts->nb_prg++;
183 }
184
185 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
186 {
187 int i;
188 struct Program *p = NULL;
189 for(i=0; i<ts->nb_prg; i++) {
190 if(ts->prg[i].id == programid) {
191 p = &ts->prg[i];
192 break;
193 }
194 }
195 if(!p)
196 return;
197
198 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
199 return;
200 p->pids[p->nb_pids++] = pid;
201 }
202
203 /**
204 * \brief discard_pid() decides if the pid is to be discarded according
205 * to caller's programs selection
206 * \param ts : - TS context
207 * \param pid : - pid
208 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
209 * 0 otherwise
210 */
211 static int discard_pid(MpegTSContext *ts, unsigned int pid)
212 {
213 int i, j, k;
214 int used = 0, discarded = 0;
215 struct Program *p;
216 for(i=0; i<ts->nb_prg; i++) {
217 p = &ts->prg[i];
218 for(j=0; j<p->nb_pids; j++) {
219 if(p->pids[j] != pid)
220 continue;
221 //is program with id p->id set to be discarded?
222 for(k=0; k<ts->stream->nb_programs; k++) {
223 if(ts->stream->programs[k]->id == p->id) {
224 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
225 discarded++;
226 else
227 used++;
228 }
229 }
230 }
231 }
232
233 return !used && discarded;
234 }
235
236 /**
237 * Assembles PES packets out of TS packets, and then calls the "section_cb"
238 * function when they are complete.
239 */
240 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
241 const uint8_t *buf, int buf_size, int is_start)
242 {
243 MpegTSSectionFilter *tss = &tss1->u.section_filter;
244 int len;
245
246 if (is_start) {
247 memcpy(tss->section_buf, buf, buf_size);
248 tss->section_index = buf_size;
249 tss->section_h_size = -1;
250 tss->end_of_section_reached = 0;
251 } else {
252 if (tss->end_of_section_reached)
253 return;
254 len = 4096 - tss->section_index;
255 if (buf_size < len)
256 len = buf_size;
257 memcpy(tss->section_buf + tss->section_index, buf, len);
258 tss->section_index += len;
259 }
260
261 /* compute section length if possible */
262 if (tss->section_h_size == -1 && tss->section_index >= 3) {
263 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
264 if (len > 4096)
265 return;
266 tss->section_h_size = len;
267 }
268
269 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
270 tss->end_of_section_reached = 1;
271 if (!tss->check_crc ||
272 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
273 tss->section_buf, tss->section_h_size) == 0)
274 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
275 }
276 }
277
278 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
279 SectionCallback *section_cb, void *opaque,
280 int check_crc)
281
282 {
283 MpegTSFilter *filter;
284 MpegTSSectionFilter *sec;
285
286 dprintf(ts->stream, "Filter: pid=0x%x\n", pid);
287
288 if (pid >= NB_PID_MAX || ts->pids[pid])
289 return NULL;
290 filter = av_mallocz(sizeof(MpegTSFilter));
291 if (!filter)
292 return NULL;
293 ts->pids[pid] = filter;
294 filter->type = MPEGTS_SECTION;
295 filter->pid = pid;
296 filter->last_cc = -1;
297 sec = &filter->u.section_filter;
298 sec->section_cb = section_cb;
299 sec->opaque = opaque;
300 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
301 sec->check_crc = check_crc;
302 if (!sec->section_buf) {
303 av_free(filter);
304 return NULL;
305 }
306 return filter;
307 }
308
309 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
310 PESCallback *pes_cb,
311 void *opaque)
312 {
313 MpegTSFilter *filter;
314 MpegTSPESFilter *pes;
315
316 if (pid >= NB_PID_MAX || ts->pids[pid])
317 return NULL;
318 filter = av_mallocz(sizeof(MpegTSFilter));
319 if (!filter)
320 return NULL;
321 ts->pids[pid] = filter;
322 filter->type = MPEGTS_PES;
323 filter->pid = pid;
324 filter->last_cc = -1;
325 pes = &filter->u.pes_filter;
326 pes->pes_cb = pes_cb;
327 pes->opaque = opaque;
328 return filter;
329 }
330
331 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
332 {
333 int pid;
334
335 pid = filter->pid;
336 if (filter->type == MPEGTS_SECTION)
337 av_freep(&filter->u.section_filter.section_buf);
338 else if (filter->type == MPEGTS_PES) {
339 /* referenced private data will be freed later in
340 * av_close_input_stream */
341 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
342 av_freep(&filter->u.pes_filter.opaque);
343 }
344 }
345
346 av_free(filter);
347 ts->pids[pid] = NULL;
348 }
349
350 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
351 int stat[packet_size];
352 int i;
353 int x=0;
354 int best_score=0;
355
356 memset(stat, 0, packet_size*sizeof(int));
357
358 for(x=i=0; i<size-3; i++){
359 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
360 stat[x]++;
361 if(stat[x] > best_score){
362 best_score= stat[x];
363 if(index) *index= x;
364 }
365 }
366
367 x++;
368 if(x == packet_size) x= 0;
369 }
370
371 return best_score;
372 }
373
374 /* autodetect fec presence. Must have at least 1024 bytes */
375 static int get_packet_size(const uint8_t *buf, int size)
376 {
377 int score, fec_score, dvhs_score;
378
379 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
380 return -1;
381
382 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
383 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
384 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
385 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
386
387 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
388 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
389 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
390 else return -1;
391 }
392
393 typedef struct SectionHeader {
394 uint8_t tid;
395 uint16_t id;
396 uint8_t version;
397 uint8_t sec_num;
398 uint8_t last_sec_num;
399 } SectionHeader;
400
401 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
402 {
403 const uint8_t *p;
404 int c;
405
406 p = *pp;
407 if (p >= p_end)
408 return -1;
409 c = *p++;
410 *pp = p;
411 return c;
412 }
413
414 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
415 {
416 const uint8_t *p;
417 int c;
418
419 p = *pp;
420 if ((p + 1) >= p_end)
421 return -1;
422 c = AV_RB16(p);
423 p += 2;
424 *pp = p;
425 return c;
426 }
427
428 /* read and allocate a DVB string preceeded by its length */
429 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
430 {
431 int len;
432 const uint8_t *p;
433 char *str;
434
435 p = *pp;
436 len = get8(&p, p_end);
437 if (len < 0)
438 return NULL;
439 if ((p + len) > p_end)
440 return NULL;
441 str = av_malloc(len + 1);
442 if (!str)
443 return NULL;
444 memcpy(str, p, len);
445 str[len] = '\0';
446 p += len;
447 *pp = p;
448 return str;
449 }
450
451 static int parse_section_header(SectionHeader *h,
452 const uint8_t **pp, const uint8_t *p_end)
453 {
454 int val;
455
456 val = get8(pp, p_end);
457 if (val < 0)
458 return -1;
459 h->tid = val;
460 *pp += 2;
461 val = get16(pp, p_end);
462 if (val < 0)
463 return -1;
464 h->id = val;
465 val = get8(pp, p_end);
466 if (val < 0)
467 return -1;
468 h->version = (val >> 1) & 0x1f;
469 val = get8(pp, p_end);
470 if (val < 0)
471 return -1;
472 h->sec_num = val;
473 val = get8(pp, p_end);
474 if (val < 0)
475 return -1;
476 h->last_sec_num = val;
477 return 0;
478 }
479
480
481 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
482 {
483 MpegTSContext *ts = filter->u.section_filter.opaque;
484 SectionHeader h1, *h = &h1;
485 PESContext *pes;
486 AVStream *st;
487 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
488 int program_info_length, pcr_pid, pid, stream_type;
489 int desc_list_len, desc_len, desc_tag;
490 int comp_page = 0, anc_page = 0; /* initialize to kill warnings */
491 char language[4] = {0}; /* initialize to kill warnings */
492 int has_hdmv_descr = 0;
493 int has_dirac_descr = 0;
494 uint32_t reg_desc = 0; /* registration descriptor */
495
496 #ifdef DEBUG
497 dprintf(ts->stream, "PMT: len %i\n", section_len);
498 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
499 #endif
500
501 p_end = section + section_len - 4;
502 p = section;
503 if (parse_section_header(h, &p, p_end) < 0)
504 return;
505
506 dprintf(ts->stream, "sid=0x%x sec_num=%d/%d\n",
507 h->id, h->sec_num, h->last_sec_num);
508
509 if (h->tid != PMT_TID)
510 return;
511
512 clear_program(ts, h->id);
513 pcr_pid = get16(&p, p_end) & 0x1fff;
514 if (pcr_pid < 0)
515 return;
516 add_pid_to_pmt(ts, h->id, pcr_pid);
517
518 dprintf(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
519
520 program_info_length = get16(&p, p_end) & 0xfff;
521 if (program_info_length < 0)
522 return;
523 while(program_info_length >= 2) {
524 uint8_t tag, len;
525 tag = get8(&p, p_end);
526 len = get8(&p, p_end);
527 if(len > program_info_length - 2)
528 //something else is broken, exit the program_descriptors_loop
529 break;
530 program_info_length -= len + 2;
531 if(tag == REGISTRATION_DESCRIPTOR && len >= 4) {
532 reg_desc = bytestream_get_le32(&p);
533 len -= 4;
534 if(reg_desc == AV_RL32("HDMV"))
535 has_hdmv_descr = 1;
536 }
537 p += len;
538 }
539 p += program_info_length;
540 if (p >= p_end)
541 return;
542 for(;;) {
543 language[0] = 0;
544 st = 0;
545 stream_type = get8(&p, p_end);
546 if (stream_type < 0)
547 break;
548 pid = get16(&p, p_end) & 0x1fff;
549 if (pid < 0)
550 break;
551 desc_list_len = get16(&p, p_end) & 0xfff;
552 if (desc_list_len < 0)
553 break;
554 desc_list_end = p + desc_list_len;
555 if (desc_list_end > p_end)
556 break;
557 for(;;) {
558 desc_tag = get8(&p, desc_list_end);
559 if (desc_tag < 0)
560 break;
561 if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
562 if((desc_tag == 0x6A) || (desc_tag == 0x7A)) {
563 /*assume DVB AC-3 Audio*/
564 stream_type = STREAM_TYPE_AUDIO_AC3;
565 } else if(desc_tag == 0x7B) {
566 /* DVB DTS audio */
567 stream_type = STREAM_TYPE_AUDIO_DTS;
568 }
569 }
570 desc_len = get8(&p, desc_list_end);
571 if (desc_len < 0)
572 break;
573 desc_end = p + desc_len;
574 if (desc_end > desc_list_end)
575 break;
576
577 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
578 desc_tag, desc_len);
579
580 switch(desc_tag) {
581 case DVB_SUBT_DESCID:
582 if (stream_type == STREAM_TYPE_PRIVATE_DATA)
583 stream_type = STREAM_TYPE_SUBTITLE_DVB;
584
585 language[0] = get8(&p, desc_end);
586 language[1] = get8(&p, desc_end);
587 language[2] = get8(&p, desc_end);
588 language[3] = 0;
589 get8(&p, desc_end);
590 comp_page = get16(&p, desc_end);
591 anc_page = get16(&p, desc_end);
592
593 break;
594 case 0x0a: /* ISO 639 language descriptor */
595 language[0] = get8(&p, desc_end);
596 language[1] = get8(&p, desc_end);
597 language[2] = get8(&p, desc_end);
598 language[3] = 0;
599 break;
600 case REGISTRATION_DESCRIPTOR: /*MPEG-2 Registration descriptor */
601 reg_desc = bytestream_get_le32(&p);
602 if(reg_desc == AV_RL32("drac"))
603 has_dirac_descr = 1;
604 else if(reg_desc == AV_RL32("AC-3"))
605 stream_type = STREAM_TYPE_AUDIO_AC3;
606 break;
607 default:
608 break;
609 }
610 p = desc_end;
611 }
612 p = desc_list_end;
613
614 dprintf(ts->stream, "stream_type=%x pid=0x%x\n",
615 stream_type, pid);
616
617 /* now create ffmpeg stream */
618 switch(stream_type) {
619 case STREAM_TYPE_AUDIO_MPEG1:
620 case STREAM_TYPE_AUDIO_MPEG2:
621 case STREAM_TYPE_VIDEO_MPEG1:
622 case STREAM_TYPE_VIDEO_MPEG2:
623 case STREAM_TYPE_VIDEO_MPEG4:
624 case STREAM_TYPE_VIDEO_H264:
625 case STREAM_TYPE_VIDEO_VC1:
626 case STREAM_TYPE_VIDEO_DIRAC:
627 case STREAM_TYPE_AUDIO_AAC:
628 case STREAM_TYPE_AUDIO_AC3:
629 case STREAM_TYPE_AUDIO_DTS:
630 case STREAM_TYPE_AUDIO_HDMV_DTS:
631 case STREAM_TYPE_SUBTITLE_DVB:
632 if((stream_type == STREAM_TYPE_AUDIO_HDMV_DTS && !has_hdmv_descr)
633 || (stream_type == STREAM_TYPE_VIDEO_DIRAC && !has_dirac_descr))
634 break;
635 if(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES){
636 pes= ts->pids[pid]->u.pes_filter.opaque;
637 st= pes->st;
638 }else{
639 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
640 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
641 if (pes)
642 st = new_pes_av_stream(pes, 0);
643 }
644 add_pid_to_pmt(ts, h->id, pid);
645 if(st)
646 av_program_add_stream_index(ts->stream, h->id, st->index);
647 break;
648 default:
649 /* we ignore the other streams */
650 break;
651 }
652
653 if (st) {
654 if (language[0] != 0) {
655 av_metadata_set(&st->metadata, "language", language);
656 }
657
658 if (stream_type == STREAM_TYPE_SUBTITLE_DVB) {
659 st->codec->sub_id = (anc_page << 16) | comp_page;
660 }
661 }
662 }
663 /* all parameters are there */
664 ts->stop_parse++;
665 mpegts_close_filter(ts, filter);
666 }
667
668 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
669 {
670 MpegTSContext *ts = filter->u.section_filter.opaque;
671 SectionHeader h1, *h = &h1;
672 const uint8_t *p, *p_end;
673 int sid, pmt_pid;
674
675 #ifdef DEBUG
676 dprintf(ts->stream, "PAT:\n");
677 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
678 #endif
679 p_end = section + section_len - 4;
680 p = section;
681 if (parse_section_header(h, &p, p_end) < 0)
682 return;
683 if (h->tid != PAT_TID)
684 return;
685
686 clear_programs(ts);
687 for(;;) {
688 sid = get16(&p, p_end);
689 if (sid < 0)
690 break;
691 pmt_pid = get16(&p, p_end) & 0x1fff;
692 if (pmt_pid < 0)
693 break;
694
695 dprintf(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
696
697 if (sid == 0x0000) {
698 /* NIT info */
699 } else {
700 av_new_program(ts->stream, sid);
701 ts->stop_parse--;
702 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
703 add_pat_entry(ts, sid);
704 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
705 add_pid_to_pmt(ts, sid, pmt_pid);
706 }
707 }
708 /* not found */
709 ts->stop_parse++;
710
711 mpegts_close_filter(ts, filter);
712 }
713
714 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
715 {
716 MpegTSContext *ts = filter->u.section_filter.opaque;
717 SectionHeader h1, *h = &h1;
718 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
719 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
720 char *name, *provider_name;
721
722 #ifdef DEBUG
723 dprintf(ts->stream, "SDT:\n");
724 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
725 #endif
726
727 p_end = section + section_len - 4;
728 p = section;
729 if (parse_section_header(h, &p, p_end) < 0)
730 return;
731 if (h->tid != SDT_TID)
732 return;
733 onid = get16(&p, p_end);
734 if (onid < 0)
735 return;
736 val = get8(&p, p_end);
737 if (val < 0)
738 return;
739 for(;;) {
740 sid = get16(&p, p_end);
741 if (sid < 0)
742 break;
743 val = get8(&p, p_end);
744 if (val < 0)
745 break;
746 desc_list_len = get16(&p, p_end) & 0xfff;
747 if (desc_list_len < 0)
748 break;
749 desc_list_end = p + desc_list_len;
750 if (desc_list_end > p_end)
751 break;
752 for(;;) {
753 desc_tag = get8(&p, desc_list_end);
754 if (desc_tag < 0)
755 break;
756 desc_len = get8(&p, desc_list_end);
757 desc_end = p + desc_len;
758 if (desc_end > desc_list_end)
759 break;
760
761 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
762 desc_tag, desc_len);
763
764 switch(desc_tag) {
765 case 0x48:
766 service_type = get8(&p, p_end);
767 if (service_type < 0)
768 break;
769 provider_name = getstr8(&p, p_end);
770 if (!provider_name)
771 break;
772 name = getstr8(&p, p_end);
773 if (name) {
774 AVProgram *program = av_new_program(ts->stream, sid);
775 if(program) {
776 av_metadata_set(&program->metadata, "name", name);
777 av_metadata_set(&program->metadata, "provider_name", provider_name);
778 }
779 }
780 av_free(name);
781 av_free(provider_name);
782 break;
783 default:
784 break;
785 }
786 p = desc_end;
787 }
788 p = desc_list_end;
789 }
790 }
791
792 static int64_t get_pts(const uint8_t *p)
793 {
794 int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
795 pts |= (AV_RB16(p + 1) >> 1) << 15;
796 pts |= AV_RB16(p + 3) >> 1;
797 return pts;
798 }
799
800 /* return non zero if a packet could be constructed */
801 static void mpegts_push_data(MpegTSFilter *filter,
802 const uint8_t *buf, int buf_size, int is_start,
803 int64_t pos)
804 {
805 PESContext *pes = filter->u.pes_filter.opaque;
806 MpegTSContext *ts = pes->ts;
807 const uint8_t *p;
808 int len, code;
809
810 if(!ts->pkt)
811 return;
812
813 if (is_start) {
814 pes->state = MPEGTS_HEADER;
815 pes->data_index = 0;
816 pes->ts_packet_pos = pos;
817 }
818 p = buf;
819 while (buf_size > 0) {
820 switch(pes->state) {
821 case MPEGTS_HEADER:
822 len = PES_START_SIZE - pes->data_index;
823 if (len > buf_size)
824 len = buf_size;
825 memcpy(pes->header + pes->data_index, p, len);
826 pes->data_index += len;
827 p += len;
828 buf_size -= len;
829 if (pes->data_index == PES_START_SIZE) {
830 /* we got all the PES or section header. We can now
831 decide */
832 #if 0
833 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
834 #endif
835 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
836 pes->header[2] == 0x01) {
837 /* it must be an mpeg2 PES stream */
838 code = pes->header[3] | 0x100;
839 if (!pes->st ||
840 !((code >= 0x1c0 && code <= 0x1df) ||
841 (code >= 0x1e0 && code <= 0x1ef) ||
842 (code == 0x1bd) || (code == 0x1fd)))
843 goto skip;
844 pes->state = MPEGTS_PESHEADER_FILL;
845 pes->total_size = AV_RB16(pes->header + 4);
846 /* NOTE: a zero total size means the PES size is
847 unbounded */
848 if (pes->total_size)
849 pes->total_size += 6;
850 pes->pes_header_size = pes->header[8] + 9;
851 } else {
852 /* otherwise, it should be a table */
853 /* skip packet */
854 skip:
855 pes->state = MPEGTS_SKIP;
856 continue;
857 }
858 }
859 break;
860 /**********************************************/
861 /* PES packing parsing */
862 case MPEGTS_PESHEADER_FILL:
863 len = pes->pes_header_size - pes->data_index;
864 if (len > buf_size)
865 len = buf_size;
866 memcpy(pes->header + pes->data_index, p, len);
867 pes->data_index += len;
868 p += len;
869 buf_size -= len;
870 if (pes->data_index == pes->pes_header_size) {
871 const uint8_t *r;
872 unsigned int flags;
873
874 flags = pes->header[7];
875 r = pes->header + 9;
876 pes->pts = AV_NOPTS_VALUE;
877 pes->dts = AV_NOPTS_VALUE;
878 if ((flags & 0xc0) == 0x80) {
879 pes->dts = pes->pts = get_pts(r);
880 r += 5;
881 } else if ((flags & 0xc0) == 0xc0) {
882 pes->pts = get_pts(r);
883 r += 5;
884 pes->dts = get_pts(r);
885 r += 5;
886 }
887 /* we got the full header. We parse it and get the payload */
888 pes->state = MPEGTS_PAYLOAD;
889 }
890 break;
891 case MPEGTS_PAYLOAD:
892 if (pes->total_size) {
893 len = pes->total_size - pes->data_index;
894 if (len > buf_size)
895 len = buf_size;
896 } else {
897 len = buf_size;
898 }
899 if (len > 0) {
900 AVPacket *pkt = ts->pkt;
901 if (pes->st && av_new_packet(pkt, len) == 0) {
902 memcpy(pkt->data, p, len);
903 pkt->stream_index = pes->st->index;
904 pkt->pts = pes->pts;
905 pkt->dts = pes->dts;
906 /* store position of first TS packet of this PES packet */
907 pkt->pos = pes->ts_packet_pos;
908 /* reset pts values */
909 pes->pts = AV_NOPTS_VALUE;
910 pes->dts = AV_NOPTS_VALUE;
911 ts->stop_parse = 1;
912 return;
913 }
914 }
915 buf_size = 0;
916 break;
917 case MPEGTS_SKIP:
918 buf_size = 0;
919 break;
920 }
921 }
922 }
923
924 static AVStream* new_pes_av_stream(PESContext *pes, uint32_t code)
925 {
926 AVStream *st;
927 enum CodecID codec_id;
928 enum CodecType codec_type;
929
930 switch(pes->stream_type){
931 case STREAM_TYPE_AUDIO_MPEG1:
932 case STREAM_TYPE_AUDIO_MPEG2:
933 codec_type = CODEC_TYPE_AUDIO;
934 codec_id = CODEC_ID_MP3;
935 break;
936 case STREAM_TYPE_VIDEO_MPEG1:
937 case STREAM_TYPE_VIDEO_MPEG2:
938 codec_type = CODEC_TYPE_VIDEO;
939 codec_id = CODEC_ID_MPEG2VIDEO;
940 break;
941 case STREAM_TYPE_VIDEO_MPEG4:
942 codec_type = CODEC_TYPE_VIDEO;
943 codec_id = CODEC_ID_MPEG4;
944 break;
945 case STREAM_TYPE_VIDEO_H264:
946 codec_type = CODEC_TYPE_VIDEO;
947 codec_id = CODEC_ID_H264;
948 break;
949 case STREAM_TYPE_VIDEO_VC1:
950 codec_type = CODEC_TYPE_VIDEO;
951 codec_id = CODEC_ID_VC1;
952 break;
953 case STREAM_TYPE_VIDEO_DIRAC:
954 codec_type = CODEC_TYPE_VIDEO;
955 codec_id = CODEC_ID_DIRAC;
956 break;
957 case STREAM_TYPE_AUDIO_AAC:
958 codec_type = CODEC_TYPE_AUDIO;
959 codec_id = CODEC_ID_AAC;
960 break;
961 case STREAM_TYPE_AUDIO_AC3:
962 codec_type = CODEC_TYPE_AUDIO;
963 codec_id = CODEC_ID_AC3;
964 break;
965 case STREAM_TYPE_AUDIO_DTS:
966 case STREAM_TYPE_AUDIO_HDMV_DTS:
967 codec_type = CODEC_TYPE_AUDIO;
968 codec_id = CODEC_ID_DTS;
969 break;
970 case STREAM_TYPE_SUBTITLE_DVB:
971 codec_type = CODEC_TYPE_SUBTITLE;
972 codec_id = CODEC_ID_DVB_SUBTITLE;
973 break;
974 default:
975 if (code >= 0x1c0 && code <= 0x1df) {
976 codec_type = CODEC_TYPE_AUDIO;
977 codec_id = CODEC_ID_MP2;
978 } else if (code == 0x1bd) {
979 codec_type = CODEC_TYPE_AUDIO;
980 codec_id = CODEC_ID_AC3;
981 } else {
982 codec_type = CODEC_TYPE_VIDEO;
983 codec_id = CODEC_ID_PROBE;
984 }
985 break;
986 }
987 st = av_new_stream(pes->stream, pes->pid);
988 if (st) {
989 av_set_pts_info(st, 33, 1, 90000);
990 st->priv_data = pes;
991 st->codec->codec_type = codec_type;
992 st->codec->codec_id = codec_id;
993 st->need_parsing = AVSTREAM_PARSE_FULL;
994 pes->st = st;
995 }
996 return st;
997 }
998
999
1000 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
1001 {
1002 MpegTSFilter *tss;
1003 PESContext *pes;
1004
1005 /* if no pid found, then add a pid context */
1006 pes = av_mallocz(sizeof(PESContext));
1007 if (!pes)
1008 return 0;
1009 pes->ts = ts;
1010 pes->stream = ts->stream;
1011 pes->pid = pid;
1012 pes->pcr_pid = pcr_pid;
1013 pes->stream_type = stream_type;
1014 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1015 if (!tss) {
1016 av_free(pes);
1017 return 0;
1018 }
1019 return pes;
1020 }
1021
1022 /* handle one TS packet */
1023 static void handle_packet(MpegTSContext *ts, const uint8_t *packet)
1024 {
1025 AVFormatContext *s = ts->stream;
1026 MpegTSFilter *tss;
1027 int len, pid, cc, cc_ok, afc, is_start;
1028 const uint8_t *p, *p_end;
1029 int64_t pos;
1030
1031 pid = AV_RB16(packet + 1) & 0x1fff;
1032 if(pid && discard_pid(ts, pid))
1033 return;
1034 is_start = packet[1] & 0x40;
1035 tss = ts->pids[pid];
1036 if (ts->auto_guess && tss == NULL && is_start) {
1037 add_pes_stream(ts, pid, -1, 0);
1038 tss = ts->pids[pid];
1039 }
1040 if (!tss)
1041 return;
1042
1043 /* continuity check (currently not used) */
1044 cc = (packet[3] & 0xf);
1045 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1046 tss->last_cc = cc;
1047
1048 /* skip adaptation field */
1049 afc = (packet[3] >> 4) & 3;
1050 p = packet + 4;
1051 if (afc == 0) /* reserved value */
1052 return;
1053 if (afc == 2) /* adaptation field only */
1054 return;
1055 if (afc == 3) {
1056 /* skip adapation field */
1057 p += p[0] + 1;
1058 }
1059 /* if past the end of packet, ignore */
1060 p_end = packet + TS_PACKET_SIZE;
1061 if (p >= p_end)
1062 return;
1063
1064 pos = url_ftell(ts->stream->pb);
1065 ts->pos47= pos % ts->raw_packet_size;
1066
1067 if (tss->type == MPEGTS_SECTION) {
1068 if (is_start) {
1069 /* pointer field present */
1070 len = *p++;
1071 if (p + len > p_end)
1072 return;
1073 if (len && cc_ok) {
1074 /* write remaining section bytes */
1075 write_section_data(s, tss,
1076 p, len, 0);
1077 /* check whether filter has been closed */
1078 if (!ts->pids[pid])
1079 return;
1080 }
1081 p += len;
1082 if (p < p_end) {
1083 write_section_data(s, tss,
1084 p, p_end - p, 1);
1085 }
1086 } else {
1087 if (cc_ok) {
1088 write_section_data(s, tss,
1089 p, p_end - p, 0);
1090 }
1091 }
1092 } else {
1093 // Note: The position here points actually behind the current packet.
1094 tss->u.pes_filter.pes_cb(tss,
1095 p, p_end - p, is_start, pos - ts->raw_packet_size);
1096 }
1097 }
1098
1099 /* XXX: try to find a better synchro over several packets (use
1100 get_packet_size() ?) */
1101 static int mpegts_resync(ByteIOContext *pb)
1102 {
1103 int c, i;
1104
1105 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1106 c = url_fgetc(pb);
1107 if (c < 0)
1108 return -1;
1109 if (c == 0x47) {
1110 url_fseek(pb, -1, SEEK_CUR);
1111 return 0;
1112 }
1113 }
1114 /* no sync found */
1115 return -1;
1116 }
1117
1118 /* return -1 if error or EOF. Return 0 if OK. */
1119 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1120 {
1121 int skip, len;
1122
1123 for(;;) {
1124 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1125 if (len != TS_PACKET_SIZE)
1126 return AVERROR(EIO);
1127 /* check paquet sync byte */
1128 if (buf[0] != 0x47) {
1129 /* find a new packet start */
1130 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1131 if (mpegts_resync(pb) < 0)
1132 return AVERROR_INVALIDDATA;
1133 else
1134 continue;
1135 } else {
1136 skip = raw_packet_size - TS_PACKET_SIZE;
1137 if (skip > 0)
1138 url_fskip(pb, skip);
1139 break;
1140 }
1141 }
1142 return 0;
1143 }
1144
1145 static int handle_packets(MpegTSContext *ts, int nb_packets)
1146 {
1147 AVFormatContext *s = ts->stream;
1148 ByteIOContext *pb = s->pb;
1149 uint8_t packet[TS_PACKET_SIZE];
1150 int packet_num, ret;
1151
1152 ts->stop_parse = 0;
1153 packet_num = 0;
1154 for(;;) {
1155 if (ts->stop_parse>0)
1156 break;
1157 packet_num++;
1158 if (nb_packets != 0 && packet_num >= nb_packets)
1159 break;
1160 ret = read_packet(pb, packet, ts->raw_packet_size);
1161 if (ret != 0)
1162 return ret;
1163 handle_packet(ts, packet);
1164 }
1165 return 0;
1166 }
1167
1168 static int mpegts_probe(AVProbeData *p)
1169 {
1170 #if 1
1171 const int size= p->buf_size;
1172 int score, fec_score, dvhs_score;
1173 int check_count= size / TS_FEC_PACKET_SIZE;
1174 #define CHECK_COUNT 10
1175
1176 if (check_count < CHECK_COUNT)
1177 return -1;
1178
1179 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1180 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1181 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1182 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1183
1184 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1185 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1186 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1187 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1188 else return -1;
1189 #else
1190 /* only use the extension for safer guess */
1191 if (match_ext(p->filename, "ts"))
1192 return AVPROBE_SCORE_MAX;
1193 else
1194 return 0;
1195 #endif
1196 }
1197
1198 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1199 (-1) if not available */
1200 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1201 const uint8_t *packet)
1202 {
1203 int afc, len, flags;
1204 const uint8_t *p;
1205 unsigned int v;
1206
1207 afc = (packet[3] >> 4) & 3;
1208 if (afc <= 1)
1209 return -1;
1210 p = packet + 4;
1211 len = p[0];
1212 p++;
1213 if (len == 0)
1214 return -1;
1215 flags = *p++;
1216 len--;
1217 if (!(flags & 0x10))
1218 return -1;
1219 if (len < 6)
1220 return -1;
1221 v = AV_RB32(p);
1222 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1223 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1224 return 0;
1225 }
1226
1227 static int mpegts_read_header(AVFormatContext *s,
1228 AVFormatParameters *ap)
1229 {
1230 MpegTSContext *ts = s->priv_data;
1231 ByteIOContext *pb = s->pb;
1232 uint8_t buf[5*1024];
1233 int len;
1234 int64_t pos;
1235
1236 if (ap) {
1237 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1238 if(ap->mpeg2ts_raw){
1239 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1240 return -1;
1241 }
1242 }
1243
1244 /* read the first 1024 bytes to get packet size */
1245 pos = url_ftell(pb);
1246 len = get_buffer(pb, buf, sizeof(buf));
1247 if (len != sizeof(buf))
1248 goto fail;
1249 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1250 if (ts->raw_packet_size <= 0)
1251 goto fail;
1252 ts->stream = s;
1253 ts->auto_guess = 0;
1254
1255 if (s->iformat == &mpegts_demuxer) {
1256 /* normal demux */
1257
1258 /* first do a scaning to get all the services */
1259 url_fseek(pb, pos, SEEK_SET);
1260
1261 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1262
1263 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1264
1265 handle_packets(ts, s->probesize);
1266 /* if could not find service, enable auto_guess */
1267
1268 ts->auto_guess = 1;
1269
1270 dprintf(ts->stream, "tuning done\n");
1271
1272 s->ctx_flags |= AVFMTCTX_NOHEADER;
1273 } else {
1274 AVStream *st;
1275 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1276 int64_t pcrs[2], pcr_h;
1277 int packet_count[2];
1278 uint8_t packet[TS_PACKET_SIZE];
1279
1280 /* only read packets */
1281
1282 st = av_new_stream(s, 0);
1283 if (!st)
1284 goto fail;
1285 av_set_pts_info(st, 60, 1, 27000000);
1286 st->codec->codec_type = CODEC_TYPE_DATA;
1287 st->codec->codec_id = CODEC_ID_MPEG2TS;
1288
1289 /* we iterate until we find two PCRs to estimate the bitrate */
1290 pcr_pid = -1;
1291 nb_pcrs = 0;
1292 nb_packets = 0;
1293 for(;;) {
1294 ret = read_packet(s->pb, packet, ts->raw_packet_size);
1295 if (ret < 0)
1296 return -1;
1297 pid = AV_RB16(packet + 1) & 0x1fff;
1298 if ((pcr_pid == -1 || pcr_pid == pid) &&
1299 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1300 pcr_pid = pid;
1301 packet_count[nb_pcrs] = nb_packets;
1302 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1303 nb_pcrs++;
1304 if (nb_pcrs >= 2)
1305 break;
1306 }
1307 nb_packets++;
1308 }
1309
1310 /* NOTE1: the bitrate is computed without the FEC */
1311 /* NOTE2: it is only the bitrate of the start of the stream */
1312 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1313 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1314 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1315 st->codec->bit_rate = s->bit_rate;
1316 st->start_time = ts->cur_pcr;
1317 #if 0
1318 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1319 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1320 #endif
1321 }
1322
1323 url_fseek(pb, pos, SEEK_SET);
1324 return 0;
1325 fail:
1326 return -1;
1327 }
1328
1329 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1330
1331 static int mpegts_raw_read_packet(AVFormatContext *s,
1332 AVPacket *pkt)
1333 {
1334 MpegTSContext *ts = s->priv_data;
1335 int ret, i;
1336 int64_t pcr_h, next_pcr_h, pos;
1337 int pcr_l, next_pcr_l;
1338 uint8_t pcr_buf[12];
1339
1340 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1341 return AVERROR(ENOMEM);
1342 pkt->pos= url_ftell(s->pb);
1343 ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1344 if (ret < 0) {
1345 av_free_packet(pkt);
1346 return ret;
1347 }
1348 if (ts->mpeg2ts_compute_pcr) {
1349 /* compute exact PCR for each packet */
1350 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1351 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1352 pos = url_ftell(s->pb);
1353 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1354 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1355 get_buffer(s->pb, pcr_buf, 12);
1356 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1357 /* XXX: not precise enough */
1358 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1359 (i + 1);
1360 break;
1361 }
1362 }
1363 url_fseek(s->pb, pos, SEEK_SET);
1364 /* no next PCR found: we use previous increment */
1365 ts->cur_pcr = pcr_h * 300 + pcr_l;
1366 }
1367 pkt->pts = ts->cur_pcr;
1368 pkt->duration = ts->pcr_incr;
1369 ts->cur_pcr += ts->pcr_incr;
1370 }
1371 pkt->stream_index = 0;
1372 return 0;
1373 }
1374
1375 static int mpegts_read_packet(AVFormatContext *s,
1376 AVPacket *pkt)
1377 {
1378 MpegTSContext *ts = s->priv_data;
1379
1380 ts->pkt = pkt;
1381 return handle_packets(ts, 0);
1382 }
1383
1384 static int mpegts_read_close(AVFormatContext *s)
1385 {
1386 MpegTSContext *ts = s->priv_data;
1387 int i;
1388
1389 clear_programs(ts);
1390
1391 for(i=0;i<NB_PID_MAX;i++)
1392 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1393
1394 return 0;
1395 }
1396
1397 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1398 int64_t *ppos, int64_t pos_limit)
1399 {
1400 MpegTSContext *ts = s->priv_data;
1401 int64_t pos, timestamp;
1402 uint8_t buf[TS_PACKET_SIZE];
1403 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1404 const int find_next= 1;
1405 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1406 if (find_next) {
1407 for(;;) {
1408 url_fseek(s->pb, pos, SEEK_SET);
1409 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1410 return AV_NOPTS_VALUE;
1411 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1412 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1413 break;
1414 }
1415 pos += ts->raw_packet_size;
1416 }
1417 } else {
1418 for(;;) {
1419 pos -= ts->raw_packet_size;
1420 if (pos < 0)
1421 return AV_NOPTS_VALUE;
1422 url_fseek(s->pb, pos, SEEK_SET);
1423 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1424 return AV_NOPTS_VALUE;
1425 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1426 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1427 break;
1428 }
1429 }
1430 }
1431 *ppos = pos;
1432
1433 return timestamp;
1434 }
1435
1436 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1437 MpegTSContext *ts = s->priv_data;
1438 uint8_t buf[TS_PACKET_SIZE];
1439 int64_t pos;
1440
1441 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1442 return -1;
1443
1444 pos= url_ftell(s->pb);
1445
1446 for(;;) {
1447 url_fseek(s->pb, pos, SEEK_SET);
1448 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1449 return -1;
1450 // pid = AV_RB16(buf + 1) & 0x1fff;
1451 if(buf[1] & 0x40) break;
1452 pos += ts->raw_packet_size;
1453 }
1454 url_fseek(s->pb, pos, SEEK_SET);
1455
1456 return 0;
1457 }
1458
1459 /**************************************************************/
1460 /* parsing functions - called from other demuxers such as RTP */
1461
1462 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1463 {
1464 MpegTSContext *ts;
1465
1466 ts = av_mallocz(sizeof(MpegTSContext));
1467 if (!ts)
1468 return NULL;
1469 /* no stream case, currently used by RTP */
1470 ts->raw_packet_size = TS_PACKET_SIZE;
1471 ts->stream = s;
1472 ts->auto_guess = 1;
1473 return ts;
1474 }
1475
1476 /* return the consumed length if a packet was output, or -1 if no
1477 packet is output */
1478 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1479 const uint8_t *buf, int len)
1480 {
1481 int len1;
1482
1483 len1 = len;
1484 ts->pkt = pkt;
1485 ts->stop_parse = 0;
1486 for(;;) {
1487 if (ts->stop_parse>0)
1488 break;
1489 if (len < TS_PACKET_SIZE)
1490 return -1;
1491 if (buf[0] != 0x47) {
1492 buf++;
1493 len--;
1494 } else {
1495 handle_packet(ts, buf);
1496 buf += TS_PACKET_SIZE;
1497 len -= TS_PACKET_SIZE;
1498 }
1499 }
1500 return len1 - len;
1501 }
1502
1503 void mpegts_parse_close(MpegTSContext *ts)
1504 {
1505 int i;
1506
1507 for(i=0;i<NB_PID_MAX;i++)
1508 av_free(ts->pids[i]);
1509 av_free(ts);
1510 }
1511
1512 AVInputFormat mpegts_demuxer = {
1513 "mpegts",
1514 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1515 sizeof(MpegTSContext),
1516 mpegts_probe,
1517 mpegts_read_header,
1518 mpegts_read_packet,
1519 mpegts_read_close,
1520 read_seek,
1521 mpegts_get_pcr,
1522 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1523 };
1524
1525 AVInputFormat mpegtsraw_demuxer = {
1526 "mpegtsraw",
1527 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1528 sizeof(MpegTSContext),
1529 NULL,
1530 mpegts_read_header,
1531 mpegts_raw_read_packet,
1532 mpegts_read_close,
1533 read_seek,
1534 mpegts_get_pcr,
1535 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1536 };
ffmpeg Lagarith lossless decoder