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cosmetics: add more detailed information to the documentation for
[FFMpeg-mirror/lagarith.git] / libavformat / mpegts.c
blob6c0c314f42cad1025972f20c8f333136cf107460
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 //#define DEBUG
23 //#define DEBUG_SEEK
24
25 #include "libavutil/crc.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavcodec/bytestream.h"
28 #include "avformat.h"
29 #include "mpegts.h"
30 #include "internal.h"
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
39 #define MAX_PES_PAYLOAD 200*1024
40
41 typedef struct PESContext PESContext;
42
43 static PESContext* add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type);
44
45 enum MpegTSFilterType {
46 MPEGTS_PES,
47 MPEGTS_SECTION,
48 };
49
50 typedef struct MpegTSFilter MpegTSFilter;
51
52 typedef int 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 /** to detect seek */
113 int64_t last_pos;
114
115 /******************************************/
116 /* private mpegts data */
117 /* scan context */
118 /** structure to keep track of Program->pids mapping */
119 unsigned int nb_prg;
120 struct Program *prg;
121
122
123 /** filters for various streams specified by PMT + for the PAT and PMT */
124 MpegTSFilter *pids[NB_PID_MAX];
125 };
126
127 /* TS stream handling */
128
129 enum MpegTSState {
130 MPEGTS_HEADER = 0,
131 MPEGTS_PESHEADER,
132 MPEGTS_PESHEADER_FILL,
133 MPEGTS_PAYLOAD,
134 MPEGTS_SKIP,
135 };
136
137 /* enough for PES header + length */
138 #define PES_START_SIZE 6
139 #define PES_HEADER_SIZE 9
140 #define MAX_PES_HEADER_SIZE (9 + 255)
141
142 struct PESContext {
143 int pid;
144 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
145 int stream_type;
146 MpegTSContext *ts;
147 AVFormatContext *stream;
148 AVStream *st;
149 enum MpegTSState state;
150 /* used to get the format */
151 int data_index;
152 int total_size;
153 int pes_header_size;
154 int64_t pts, dts;
155 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
156 uint8_t header[MAX_PES_HEADER_SIZE];
157 uint8_t *buffer;
158 };
159
160 extern AVInputFormat mpegts_demuxer;
161
162 static void clear_program(MpegTSContext *ts, unsigned int programid)
163 {
164 int i;
165
166 for(i=0; i<ts->nb_prg; i++)
167 if(ts->prg[i].id == programid)
168 ts->prg[i].nb_pids = 0;
169 }
170
171 static void clear_programs(MpegTSContext *ts)
172 {
173 av_freep(&ts->prg);
174 ts->nb_prg=0;
175 }
176
177 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
178 {
179 struct Program *p;
180 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
181 if(!tmp)
182 return;
183 ts->prg = tmp;
184 p = &ts->prg[ts->nb_prg];
185 p->id = programid;
186 p->nb_pids = 0;
187 ts->nb_prg++;
188 }
189
190 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
191 {
192 int i;
193 struct Program *p = NULL;
194 for(i=0; i<ts->nb_prg; i++) {
195 if(ts->prg[i].id == programid) {
196 p = &ts->prg[i];
197 break;
198 }
199 }
200 if(!p)
201 return;
202
203 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
204 return;
205 p->pids[p->nb_pids++] = pid;
206 }
207
208 /**
209 * \brief discard_pid() decides if the pid is to be discarded according
210 * to caller's programs selection
211 * \param ts : - TS context
212 * \param pid : - pid
213 * \return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
214 * 0 otherwise
215 */
216 static int discard_pid(MpegTSContext *ts, unsigned int pid)
217 {
218 int i, j, k;
219 int used = 0, discarded = 0;
220 struct Program *p;
221 for(i=0; i<ts->nb_prg; i++) {
222 p = &ts->prg[i];
223 for(j=0; j<p->nb_pids; j++) {
224 if(p->pids[j] != pid)
225 continue;
226 //is program with id p->id set to be discarded?
227 for(k=0; k<ts->stream->nb_programs; k++) {
228 if(ts->stream->programs[k]->id == p->id) {
229 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
230 discarded++;
231 else
232 used++;
233 }
234 }
235 }
236 }
237
238 return !used && discarded;
239 }
240
241 /**
242 * Assembles PES packets out of TS packets, and then calls the "section_cb"
243 * function when they are complete.
244 */
245 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
246 const uint8_t *buf, int buf_size, int is_start)
247 {
248 MpegTSSectionFilter *tss = &tss1->u.section_filter;
249 int len;
250
251 if (is_start) {
252 memcpy(tss->section_buf, buf, buf_size);
253 tss->section_index = buf_size;
254 tss->section_h_size = -1;
255 tss->end_of_section_reached = 0;
256 } else {
257 if (tss->end_of_section_reached)
258 return;
259 len = 4096 - tss->section_index;
260 if (buf_size < len)
261 len = buf_size;
262 memcpy(tss->section_buf + tss->section_index, buf, len);
263 tss->section_index += len;
264 }
265
266 /* compute section length if possible */
267 if (tss->section_h_size == -1 && tss->section_index >= 3) {
268 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
269 if (len > 4096)
270 return;
271 tss->section_h_size = len;
272 }
273
274 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
275 tss->end_of_section_reached = 1;
276 if (!tss->check_crc ||
277 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
278 tss->section_buf, tss->section_h_size) == 0)
279 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
280 }
281 }
282
283 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
284 SectionCallback *section_cb, void *opaque,
285 int check_crc)
286
287 {
288 MpegTSFilter *filter;
289 MpegTSSectionFilter *sec;
290
291 dprintf(ts->stream, "Filter: pid=0x%x\n", pid);
292
293 if (pid >= NB_PID_MAX || ts->pids[pid])
294 return NULL;
295 filter = av_mallocz(sizeof(MpegTSFilter));
296 if (!filter)
297 return NULL;
298 ts->pids[pid] = filter;
299 filter->type = MPEGTS_SECTION;
300 filter->pid = pid;
301 filter->last_cc = -1;
302 sec = &filter->u.section_filter;
303 sec->section_cb = section_cb;
304 sec->opaque = opaque;
305 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
306 sec->check_crc = check_crc;
307 if (!sec->section_buf) {
308 av_free(filter);
309 return NULL;
310 }
311 return filter;
312 }
313
314 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
315 PESCallback *pes_cb,
316 void *opaque)
317 {
318 MpegTSFilter *filter;
319 MpegTSPESFilter *pes;
320
321 if (pid >= NB_PID_MAX || ts->pids[pid])
322 return NULL;
323 filter = av_mallocz(sizeof(MpegTSFilter));
324 if (!filter)
325 return NULL;
326 ts->pids[pid] = filter;
327 filter->type = MPEGTS_PES;
328 filter->pid = pid;
329 filter->last_cc = -1;
330 pes = &filter->u.pes_filter;
331 pes->pes_cb = pes_cb;
332 pes->opaque = opaque;
333 return filter;
334 }
335
336 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
337 {
338 int pid;
339
340 pid = filter->pid;
341 if (filter->type == MPEGTS_SECTION)
342 av_freep(&filter->u.section_filter.section_buf);
343 else if (filter->type == MPEGTS_PES) {
344 PESContext *pes = filter->u.pes_filter.opaque;
345 av_freep(&pes->buffer);
346 /* referenced private data will be freed later in
347 * av_close_input_stream */
348 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
349 av_freep(&filter->u.pes_filter.opaque);
350 }
351 }
352
353 av_free(filter);
354 ts->pids[pid] = NULL;
355 }
356
357 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
358 int stat[packet_size];
359 int i;
360 int x=0;
361 int best_score=0;
362
363 memset(stat, 0, packet_size*sizeof(int));
364
365 for(x=i=0; i<size-3; i++){
366 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
367 stat[x]++;
368 if(stat[x] > best_score){
369 best_score= stat[x];
370 if(index) *index= x;
371 }
372 }
373
374 x++;
375 if(x == packet_size) x= 0;
376 }
377
378 return best_score;
379 }
380
381 /* autodetect fec presence. Must have at least 1024 bytes */
382 static int get_packet_size(const uint8_t *buf, int size)
383 {
384 int score, fec_score, dvhs_score;
385
386 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
387 return -1;
388
389 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
390 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
391 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
392 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
393
394 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
395 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
396 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
397 else return -1;
398 }
399
400 typedef struct SectionHeader {
401 uint8_t tid;
402 uint16_t id;
403 uint8_t version;
404 uint8_t sec_num;
405 uint8_t last_sec_num;
406 } SectionHeader;
407
408 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
409 {
410 const uint8_t *p;
411 int c;
412
413 p = *pp;
414 if (p >= p_end)
415 return -1;
416 c = *p++;
417 *pp = p;
418 return c;
419 }
420
421 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
422 {
423 const uint8_t *p;
424 int c;
425
426 p = *pp;
427 if ((p + 1) >= p_end)
428 return -1;
429 c = AV_RB16(p);
430 p += 2;
431 *pp = p;
432 return c;
433 }
434
435 /* read and allocate a DVB string preceeded by its length */
436 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
437 {
438 int len;
439 const uint8_t *p;
440 char *str;
441
442 p = *pp;
443 len = get8(&p, p_end);
444 if (len < 0)
445 return NULL;
446 if ((p + len) > p_end)
447 return NULL;
448 str = av_malloc(len + 1);
449 if (!str)
450 return NULL;
451 memcpy(str, p, len);
452 str[len] = '\0';
453 p += len;
454 *pp = p;
455 return str;
456 }
457
458 static int parse_section_header(SectionHeader *h,
459 const uint8_t **pp, const uint8_t *p_end)
460 {
461 int val;
462
463 val = get8(pp, p_end);
464 if (val < 0)
465 return -1;
466 h->tid = val;
467 *pp += 2;
468 val = get16(pp, p_end);
469 if (val < 0)
470 return -1;
471 h->id = val;
472 val = get8(pp, p_end);
473 if (val < 0)
474 return -1;
475 h->version = (val >> 1) & 0x1f;
476 val = get8(pp, p_end);
477 if (val < 0)
478 return -1;
479 h->sec_num = val;
480 val = get8(pp, p_end);
481 if (val < 0)
482 return -1;
483 h->last_sec_num = val;
484 return 0;
485 }
486
487 typedef struct {
488 uint32_t stream_type;
489 enum CodecType codec_type;
490 enum CodecID codec_id;
491 } StreamType;
492
493 static const StreamType ISO_types[] = {
494 { 0x01, CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
495 { 0x02, CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
496 { 0x03, CODEC_TYPE_AUDIO, CODEC_ID_MP3 },
497 { 0x04, CODEC_TYPE_AUDIO, CODEC_ID_MP3 },
498 { 0x0f, CODEC_TYPE_AUDIO, CODEC_ID_AAC },
499 { 0x10, CODEC_TYPE_VIDEO, CODEC_ID_MPEG4 },
500 { 0x1b, CODEC_TYPE_VIDEO, CODEC_ID_H264 },
501 { 0xd1, CODEC_TYPE_VIDEO, CODEC_ID_DIRAC },
502 { 0xea, CODEC_TYPE_VIDEO, CODEC_ID_VC1 },
503 { 0 },
504 };
505
506 static const StreamType HDMV_types[] = {
507 { 0x81, CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
508 { 0x82, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
509 { 0 },
510 };
511
512 /* ATSC ? */
513 static const StreamType MISC_types[] = {
514 { 0x81, CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
515 { 0x8a, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
516 { 0 },
517 };
518
519 static const StreamType REGD_types[] = {
520 { MKTAG('d','r','a','c'), CODEC_TYPE_VIDEO, CODEC_ID_DIRAC },
521 { MKTAG('A','C','-','3'), CODEC_TYPE_AUDIO, CODEC_ID_AC3 },
522 { 0 },
523 };
524
525 /* descriptor present */
526 static const StreamType DESC_types[] = {
527 { 0x6a, CODEC_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
528 { 0x7a, CODEC_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
529 { 0x7b, CODEC_TYPE_AUDIO, CODEC_ID_DTS },
530 { 0x59, CODEC_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
531 { 0 },
532 };
533
534 static void mpegts_find_stream_type(AVStream *st,
535 uint32_t stream_type, const StreamType *types)
536 {
537 for (; types->stream_type; types++) {
538 if (stream_type == types->stream_type) {
539 st->codec->codec_type = types->codec_type;
540 st->codec->codec_id = types->codec_id;
541 return;
542 }
543 }
544 }
545
546 static AVStream *new_pes_av_stream(PESContext *pes, uint32_t prog_reg_desc, uint32_t code)
547 {
548 AVStream *st = av_new_stream(pes->stream, pes->pid);
549
550 if (!st)
551 return NULL;
552
553 av_set_pts_info(st, 33, 1, 90000);
554 st->priv_data = pes;
555 st->codec->codec_type = CODEC_TYPE_DATA;
556 st->codec->codec_id = CODEC_ID_NONE;
557 st->need_parsing = AVSTREAM_PARSE_FULL;
558 pes->st = st;
559
560 dprintf(pes->stream, "stream_type=%x pid=%x prog_reg_desc=%.4s\n",
561 pes->stream_type, pes->pid, (char*)&prog_reg_desc);
562
563 st->codec->codec_tag = pes->stream_type;
564
565 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
566 if (prog_reg_desc == AV_RL32("HDMV") &&
567 st->codec->codec_id == CODEC_ID_NONE)
568 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
569 if (st->codec->codec_id == CODEC_ID_NONE)
570 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
571
572 /* stream was not present in PMT, guess based on PES start code */
573 if (st->codec->codec_id == CODEC_ID_NONE) {
574 if (code >= 0x1c0 && code <= 0x1df) {
575 st->codec->codec_type = CODEC_TYPE_AUDIO;
576 st->codec->codec_id = CODEC_ID_MP2;
577 } else if (code == 0x1bd) {
578 st->codec->codec_type = CODEC_TYPE_AUDIO;
579 st->codec->codec_id = CODEC_ID_AC3;
580 }
581 }
582
583 return st;
584 }
585
586 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
587 {
588 MpegTSContext *ts = filter->u.section_filter.opaque;
589 SectionHeader h1, *h = &h1;
590 PESContext *pes;
591 AVStream *st;
592 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
593 int program_info_length, pcr_pid, pid, stream_type;
594 int desc_list_len, desc_len, desc_tag;
595 int comp_page, anc_page;
596 char language[4];
597 uint32_t prog_reg_desc = 0; /* registration descriptor */
598
599 #ifdef DEBUG
600 dprintf(ts->stream, "PMT: len %i\n", section_len);
601 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
602 #endif
603
604 p_end = section + section_len - 4;
605 p = section;
606 if (parse_section_header(h, &p, p_end) < 0)
607 return;
608
609 dprintf(ts->stream, "sid=0x%x sec_num=%d/%d\n",
610 h->id, h->sec_num, h->last_sec_num);
611
612 if (h->tid != PMT_TID)
613 return;
614
615 clear_program(ts, h->id);
616 pcr_pid = get16(&p, p_end) & 0x1fff;
617 if (pcr_pid < 0)
618 return;
619 add_pid_to_pmt(ts, h->id, pcr_pid);
620
621 dprintf(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
622
623 program_info_length = get16(&p, p_end) & 0xfff;
624 if (program_info_length < 0)
625 return;
626 while(program_info_length >= 2) {
627 uint8_t tag, len;
628 tag = get8(&p, p_end);
629 len = get8(&p, p_end);
630 if(len > program_info_length - 2)
631 //something else is broken, exit the program_descriptors_loop
632 break;
633 program_info_length -= len + 2;
634 if(tag == 0x05 && len >= 4) { // registration descriptor
635 prog_reg_desc = bytestream_get_le32(&p);
636 len -= 4;
637 }
638 p += len;
639 }
640 p += program_info_length;
641 if (p >= p_end)
642 return;
643
644 // stop parsing after pmt, we found header
645 if (!ts->stream->nb_streams)
646 ts->stop_parse = 1;
647
648 for(;;) {
649 st = 0;
650 stream_type = get8(&p, p_end);
651 if (stream_type < 0)
652 break;
653 pid = get16(&p, p_end) & 0x1fff;
654 if (pid < 0)
655 break;
656
657 /* now create ffmpeg stream */
658 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
659 pes = ts->pids[pid]->u.pes_filter.opaque;
660 st = pes->st;
661 } else {
662 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
663 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
664 if (pes)
665 st = new_pes_av_stream(pes, prog_reg_desc, 0);
666 }
667
668 if (!st)
669 return;
670
671 add_pid_to_pmt(ts, h->id, pid);
672
673 av_program_add_stream_index(ts->stream, h->id, st->index);
674
675 desc_list_len = get16(&p, p_end) & 0xfff;
676 if (desc_list_len < 0)
677 break;
678 desc_list_end = p + desc_list_len;
679 if (desc_list_end > p_end)
680 break;
681 for(;;) {
682 desc_tag = get8(&p, desc_list_end);
683 if (desc_tag < 0)
684 break;
685 desc_len = get8(&p, desc_list_end);
686 if (desc_len < 0)
687 break;
688 desc_end = p + desc_len;
689 if (desc_end > desc_list_end)
690 break;
691
692 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
693 desc_tag, desc_len);
694
695 if (st->codec->codec_id == CODEC_ID_NONE &&
696 stream_type == STREAM_TYPE_PRIVATE_DATA)
697 mpegts_find_stream_type(st, desc_tag, DESC_types);
698
699 switch(desc_tag) {
700 case 0x59: /* subtitling descriptor */
701 language[0] = get8(&p, desc_end);
702 language[1] = get8(&p, desc_end);
703 language[2] = get8(&p, desc_end);
704 language[3] = 0;
705 get8(&p, desc_end);
706 comp_page = get16(&p, desc_end);
707 anc_page = get16(&p, desc_end);
708 st->codec->sub_id = (anc_page << 16) | comp_page;
709 av_metadata_set(&st->metadata, "language", language);
710 break;
711 case 0x0a: /* ISO 639 language descriptor */
712 language[0] = get8(&p, desc_end);
713 language[1] = get8(&p, desc_end);
714 language[2] = get8(&p, desc_end);
715 language[3] = 0;
716 av_metadata_set(&st->metadata, "language", language);
717 break;
718 case 0x05: /* registration descriptor */
719 st->codec->codec_tag = bytestream_get_le32(&p);
720 dprintf(ts->stream, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
721 if (st->codec->codec_id == CODEC_ID_NONE &&
722 stream_type == STREAM_TYPE_PRIVATE_DATA)
723 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
724 break;
725 default:
726 break;
727 }
728 p = desc_end;
729 }
730 p = desc_list_end;
731 }
732 /* all parameters are there */
733 mpegts_close_filter(ts, filter);
734 }
735
736 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
737 {
738 MpegTSContext *ts = filter->u.section_filter.opaque;
739 SectionHeader h1, *h = &h1;
740 const uint8_t *p, *p_end;
741 int sid, pmt_pid;
742
743 #ifdef DEBUG
744 dprintf(ts->stream, "PAT:\n");
745 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
746 #endif
747 p_end = section + section_len - 4;
748 p = section;
749 if (parse_section_header(h, &p, p_end) < 0)
750 return;
751 if (h->tid != PAT_TID)
752 return;
753
754 clear_programs(ts);
755 for(;;) {
756 sid = get16(&p, p_end);
757 if (sid < 0)
758 break;
759 pmt_pid = get16(&p, p_end) & 0x1fff;
760 if (pmt_pid < 0)
761 break;
762
763 dprintf(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
764
765 if (sid == 0x0000) {
766 /* NIT info */
767 } else {
768 av_new_program(ts->stream, sid);
769 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
770 add_pat_entry(ts, sid);
771 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
772 add_pid_to_pmt(ts, sid, pmt_pid);
773 }
774 }
775 }
776
777 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
778 {
779 MpegTSContext *ts = filter->u.section_filter.opaque;
780 SectionHeader h1, *h = &h1;
781 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
782 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
783 char *name, *provider_name;
784
785 #ifdef DEBUG
786 dprintf(ts->stream, "SDT:\n");
787 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
788 #endif
789
790 p_end = section + section_len - 4;
791 p = section;
792 if (parse_section_header(h, &p, p_end) < 0)
793 return;
794 if (h->tid != SDT_TID)
795 return;
796 onid = get16(&p, p_end);
797 if (onid < 0)
798 return;
799 val = get8(&p, p_end);
800 if (val < 0)
801 return;
802 for(;;) {
803 sid = get16(&p, p_end);
804 if (sid < 0)
805 break;
806 val = get8(&p, p_end);
807 if (val < 0)
808 break;
809 desc_list_len = get16(&p, p_end) & 0xfff;
810 if (desc_list_len < 0)
811 break;
812 desc_list_end = p + desc_list_len;
813 if (desc_list_end > p_end)
814 break;
815 for(;;) {
816 desc_tag = get8(&p, desc_list_end);
817 if (desc_tag < 0)
818 break;
819 desc_len = get8(&p, desc_list_end);
820 desc_end = p + desc_len;
821 if (desc_end > desc_list_end)
822 break;
823
824 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
825 desc_tag, desc_len);
826
827 switch(desc_tag) {
828 case 0x48:
829 service_type = get8(&p, p_end);
830 if (service_type < 0)
831 break;
832 provider_name = getstr8(&p, p_end);
833 if (!provider_name)
834 break;
835 name = getstr8(&p, p_end);
836 if (name) {
837 AVProgram *program = av_new_program(ts->stream, sid);
838 if(program) {
839 av_metadata_set(&program->metadata, "name", name);
840 av_metadata_set(&program->metadata, "provider_name", provider_name);
841 }
842 }
843 av_free(name);
844 av_free(provider_name);
845 break;
846 default:
847 break;
848 }
849 p = desc_end;
850 }
851 p = desc_list_end;
852 }
853 }
854
855 static int64_t get_pts(const uint8_t *p)
856 {
857 int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
858 pts |= (AV_RB16(p + 1) >> 1) << 15;
859 pts |= AV_RB16(p + 3) >> 1;
860 return pts;
861 }
862
863 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
864 {
865 av_init_packet(pkt);
866
867 pkt->destruct = av_destruct_packet;
868 pkt->data = pes->buffer;
869 pkt->size = pes->data_index;
870 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
871
872 pkt->stream_index = pes->st->index;
873 pkt->pts = pes->pts;
874 pkt->dts = pes->dts;
875 /* store position of first TS packet of this PES packet */
876 pkt->pos = pes->ts_packet_pos;
877
878 /* reset pts values */
879 pes->pts = AV_NOPTS_VALUE;
880 pes->dts = AV_NOPTS_VALUE;
881 pes->buffer = NULL;
882 pes->data_index = 0;
883 }
884
885 /* return non zero if a packet could be constructed */
886 static int mpegts_push_data(MpegTSFilter *filter,
887 const uint8_t *buf, int buf_size, int is_start,
888 int64_t pos)
889 {
890 PESContext *pes = filter->u.pes_filter.opaque;
891 MpegTSContext *ts = pes->ts;
892 const uint8_t *p;
893 int len, code;
894
895 if(!ts->pkt)
896 return 0;
897
898 if (is_start) {
899 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
900 new_pes_packet(pes, ts->pkt);
901 ts->stop_parse = 1;
902 }
903 pes->state = MPEGTS_HEADER;
904 pes->data_index = 0;
905 pes->ts_packet_pos = pos;
906 }
907 p = buf;
908 while (buf_size > 0) {
909 switch(pes->state) {
910 case MPEGTS_HEADER:
911 len = PES_START_SIZE - pes->data_index;
912 if (len > buf_size)
913 len = buf_size;
914 memcpy(pes->header + pes->data_index, p, len);
915 pes->data_index += len;
916 p += len;
917 buf_size -= len;
918 if (pes->data_index == PES_START_SIZE) {
919 /* we got all the PES or section header. We can now
920 decide */
921 #if 0
922 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
923 #endif
924 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
925 pes->header[2] == 0x01) {
926 /* it must be an mpeg2 PES stream */
927 code = pes->header[3] | 0x100;
928 dprintf(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
929
930 if ((!pes->st && pes->stream->nb_streams == MAX_STREAMS) ||
931 (pes->st && pes->st->discard == AVDISCARD_ALL) ||
932 code == 0x1be) /* padding_stream */
933 goto skip;
934
935 /* stream not present in PMT */
936 if (!pes->st)
937 pes->st = new_pes_av_stream(pes, 0, code);
938 if (!pes->st)
939 return AVERROR(ENOMEM);
940
941 pes->total_size = AV_RB16(pes->header + 4);
942 /* NOTE: a zero total size means the PES size is
943 unbounded */
944 if (!pes->total_size)
945 pes->total_size = MAX_PES_PAYLOAD;
946
947 /* allocate pes buffer */
948 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
949 if (!pes->buffer)
950 return AVERROR(ENOMEM);
951
952 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
953 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
954 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
955 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
956 pes->state = MPEGTS_PESHEADER;
957 if (pes->st->codec->codec_id == CODEC_ID_NONE) {
958 dprintf(pes->stream, "pid=%x stream_type=%x probing\n",
959 pes->pid, pes->stream_type);
960 pes->st->codec->codec_id = CODEC_ID_PROBE;
961 }
962 } else {
963 pes->state = MPEGTS_PAYLOAD;
964 pes->data_index = 0;
965 }
966 } else {
967 /* otherwise, it should be a table */
968 /* skip packet */
969 skip:
970 pes->state = MPEGTS_SKIP;
971 continue;
972 }
973 }
974 break;
975 /**********************************************/
976 /* PES packing parsing */
977 case MPEGTS_PESHEADER:
978 len = PES_HEADER_SIZE - pes->data_index;
979 if (len < 0)
980 return -1;
981 if (len > buf_size)
982 len = buf_size;
983 memcpy(pes->header + pes->data_index, p, len);
984 pes->data_index += len;
985 p += len;
986 buf_size -= len;
987 if (pes->data_index == PES_HEADER_SIZE) {
988 pes->pes_header_size = pes->header[8] + 9;
989 pes->state = MPEGTS_PESHEADER_FILL;
990 }
991 break;
992 case MPEGTS_PESHEADER_FILL:
993 len = pes->pes_header_size - pes->data_index;
994 if (len < 0)
995 return -1;
996 if (len > buf_size)
997 len = buf_size;
998 memcpy(pes->header + pes->data_index, p, len);
999 pes->data_index += len;
1000 p += len;
1001 buf_size -= len;
1002 if (pes->data_index == pes->pes_header_size) {
1003 const uint8_t *r;
1004 unsigned int flags;
1005
1006 flags = pes->header[7];
1007 r = pes->header + 9;
1008 pes->pts = AV_NOPTS_VALUE;
1009 pes->dts = AV_NOPTS_VALUE;
1010 if ((flags & 0xc0) == 0x80) {
1011 pes->dts = pes->pts = get_pts(r);
1012 r += 5;
1013 } else if ((flags & 0xc0) == 0xc0) {
1014 pes->pts = get_pts(r);
1015 r += 5;
1016 pes->dts = get_pts(r);
1017 r += 5;
1018 }
1019
1020 /* we got the full header. We parse it and get the payload */
1021 pes->state = MPEGTS_PAYLOAD;
1022 pes->data_index = 0;
1023 }
1024 break;
1025 case MPEGTS_PAYLOAD:
1026 if (buf_size > 0) {
1027 if (pes->data_index+buf_size > pes->total_size) {
1028 new_pes_packet(pes, ts->pkt);
1029 pes->total_size = MAX_PES_PAYLOAD;
1030 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
1031 if (!pes->buffer)
1032 return AVERROR(ENOMEM);
1033 ts->stop_parse = 1;
1034 }
1035 memcpy(pes->buffer+pes->data_index, p, buf_size);
1036 pes->data_index += buf_size;
1037 }
1038 buf_size = 0;
1039 break;
1040 case MPEGTS_SKIP:
1041 buf_size = 0;
1042 break;
1043 }
1044 }
1045
1046 return 0;
1047 }
1048
1049 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
1050 {
1051 MpegTSFilter *tss;
1052 PESContext *pes;
1053
1054 /* if no pid found, then add a pid context */
1055 pes = av_mallocz(sizeof(PESContext));
1056 if (!pes)
1057 return 0;
1058 pes->ts = ts;
1059 pes->stream = ts->stream;
1060 pes->pid = pid;
1061 pes->pcr_pid = pcr_pid;
1062 pes->stream_type = stream_type;
1063 pes->state = MPEGTS_SKIP;
1064 pes->pts = AV_NOPTS_VALUE;
1065 pes->dts = AV_NOPTS_VALUE;
1066 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1067 if (!tss) {
1068 av_free(pes);
1069 return 0;
1070 }
1071 return pes;
1072 }
1073
1074 /* handle one TS packet */
1075 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1076 {
1077 AVFormatContext *s = ts->stream;
1078 MpegTSFilter *tss;
1079 int len, pid, cc, cc_ok, afc, is_start;
1080 const uint8_t *p, *p_end;
1081 int64_t pos;
1082
1083 pid = AV_RB16(packet + 1) & 0x1fff;
1084 if(pid && discard_pid(ts, pid))
1085 return 0;
1086 is_start = packet[1] & 0x40;
1087 tss = ts->pids[pid];
1088 if (ts->auto_guess && tss == NULL && is_start) {
1089 add_pes_stream(ts, pid, -1, 0);
1090 tss = ts->pids[pid];
1091 }
1092 if (!tss)
1093 return 0;
1094
1095 /* continuity check (currently not used) */
1096 cc = (packet[3] & 0xf);
1097 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1098 tss->last_cc = cc;
1099
1100 /* skip adaptation field */
1101 afc = (packet[3] >> 4) & 3;
1102 p = packet + 4;
1103 if (afc == 0) /* reserved value */
1104 return 0;
1105 if (afc == 2) /* adaptation field only */
1106 return 0;
1107 if (afc == 3) {
1108 /* skip adapation field */
1109 p += p[0] + 1;
1110 }
1111 /* if past the end of packet, ignore */
1112 p_end = packet + TS_PACKET_SIZE;
1113 if (p >= p_end)
1114 return 0;
1115
1116 pos = url_ftell(ts->stream->pb);
1117 ts->pos47= pos % ts->raw_packet_size;
1118
1119 if (tss->type == MPEGTS_SECTION) {
1120 if (is_start) {
1121 /* pointer field present */
1122 len = *p++;
1123 if (p + len > p_end)
1124 return 0;
1125 if (len && cc_ok) {
1126 /* write remaining section bytes */
1127 write_section_data(s, tss,
1128 p, len, 0);
1129 /* check whether filter has been closed */
1130 if (!ts->pids[pid])
1131 return 0;
1132 }
1133 p += len;
1134 if (p < p_end) {
1135 write_section_data(s, tss,
1136 p, p_end - p, 1);
1137 }
1138 } else {
1139 if (cc_ok) {
1140 write_section_data(s, tss,
1141 p, p_end - p, 0);
1142 }
1143 }
1144 } else {
1145 int ret;
1146 // Note: The position here points actually behind the current packet.
1147 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1148 pos - ts->raw_packet_size)) < 0)
1149 return ret;
1150 }
1151
1152 return 0;
1153 }
1154
1155 /* XXX: try to find a better synchro over several packets (use
1156 get_packet_size() ?) */
1157 static int mpegts_resync(ByteIOContext *pb)
1158 {
1159 int c, i;
1160
1161 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1162 c = url_fgetc(pb);
1163 if (c < 0)
1164 return -1;
1165 if (c == 0x47) {
1166 url_fseek(pb, -1, SEEK_CUR);
1167 return 0;
1168 }
1169 }
1170 /* no sync found */
1171 return -1;
1172 }
1173
1174 /* return -1 if error or EOF. Return 0 if OK. */
1175 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1176 {
1177 int skip, len;
1178
1179 for(;;) {
1180 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1181 if (len != TS_PACKET_SIZE)
1182 return AVERROR(EIO);
1183 /* check paquet sync byte */
1184 if (buf[0] != 0x47) {
1185 /* find a new packet start */
1186 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1187 if (mpegts_resync(pb) < 0)
1188 return AVERROR_INVALIDDATA;
1189 else
1190 continue;
1191 } else {
1192 skip = raw_packet_size - TS_PACKET_SIZE;
1193 if (skip > 0)
1194 url_fskip(pb, skip);
1195 break;
1196 }
1197 }
1198 return 0;
1199 }
1200
1201 static int handle_packets(MpegTSContext *ts, int nb_packets)
1202 {
1203 AVFormatContext *s = ts->stream;
1204 ByteIOContext *pb = s->pb;
1205 uint8_t packet[TS_PACKET_SIZE];
1206 int packet_num, ret;
1207
1208 ts->stop_parse = 0;
1209 packet_num = 0;
1210 for(;;) {
1211 if (ts->stop_parse>0)
1212 break;
1213 packet_num++;
1214 if (nb_packets != 0 && packet_num >= nb_packets)
1215 break;
1216 ret = read_packet(pb, packet, ts->raw_packet_size);
1217 if (ret != 0)
1218 return ret;
1219 ret = handle_packet(ts, packet);
1220 if (ret != 0)
1221 return ret;
1222 }
1223 return 0;
1224 }
1225
1226 static int mpegts_probe(AVProbeData *p)
1227 {
1228 #if 1
1229 const int size= p->buf_size;
1230 int score, fec_score, dvhs_score;
1231 int check_count= size / TS_FEC_PACKET_SIZE;
1232 #define CHECK_COUNT 10
1233
1234 if (check_count < CHECK_COUNT)
1235 return -1;
1236
1237 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1238 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1239 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1240 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1241
1242 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1243 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1244 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1245 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1246 else return -1;
1247 #else
1248 /* only use the extension for safer guess */
1249 if (match_ext(p->filename, "ts"))
1250 return AVPROBE_SCORE_MAX;
1251 else
1252 return 0;
1253 #endif
1254 }
1255
1256 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1257 (-1) if not available */
1258 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1259 const uint8_t *packet)
1260 {
1261 int afc, len, flags;
1262 const uint8_t *p;
1263 unsigned int v;
1264
1265 afc = (packet[3] >> 4) & 3;
1266 if (afc <= 1)
1267 return -1;
1268 p = packet + 4;
1269 len = p[0];
1270 p++;
1271 if (len == 0)
1272 return -1;
1273 flags = *p++;
1274 len--;
1275 if (!(flags & 0x10))
1276 return -1;
1277 if (len < 6)
1278 return -1;
1279 v = AV_RB32(p);
1280 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1281 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1282 return 0;
1283 }
1284
1285 static int mpegts_read_header(AVFormatContext *s,
1286 AVFormatParameters *ap)
1287 {
1288 MpegTSContext *ts = s->priv_data;
1289 ByteIOContext *pb = s->pb;
1290 uint8_t buf[5*1024];
1291 int len;
1292 int64_t pos;
1293
1294 if (ap) {
1295 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1296 if(ap->mpeg2ts_raw){
1297 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1298 return -1;
1299 }
1300 }
1301
1302 /* read the first 1024 bytes to get packet size */
1303 pos = url_ftell(pb);
1304 len = get_buffer(pb, buf, sizeof(buf));
1305 if (len != sizeof(buf))
1306 goto fail;
1307 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1308 if (ts->raw_packet_size <= 0)
1309 goto fail;
1310 ts->stream = s;
1311 ts->auto_guess = 0;
1312
1313 if (s->iformat == &mpegts_demuxer) {
1314 /* normal demux */
1315
1316 /* first do a scaning to get all the services */
1317 url_fseek(pb, pos, SEEK_SET);
1318
1319 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1320
1321 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1322
1323 handle_packets(ts, s->probesize);
1324 /* if could not find service, enable auto_guess */
1325
1326 ts->auto_guess = 1;
1327
1328 dprintf(ts->stream, "tuning done\n");
1329
1330 s->ctx_flags |= AVFMTCTX_NOHEADER;
1331 } else {
1332 AVStream *st;
1333 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1334 int64_t pcrs[2], pcr_h;
1335 int packet_count[2];
1336 uint8_t packet[TS_PACKET_SIZE];
1337
1338 /* only read packets */
1339
1340 st = av_new_stream(s, 0);
1341 if (!st)
1342 goto fail;
1343 av_set_pts_info(st, 60, 1, 27000000);
1344 st->codec->codec_type = CODEC_TYPE_DATA;
1345 st->codec->codec_id = CODEC_ID_MPEG2TS;
1346
1347 /* we iterate until we find two PCRs to estimate the bitrate */
1348 pcr_pid = -1;
1349 nb_pcrs = 0;
1350 nb_packets = 0;
1351 for(;;) {
1352 ret = read_packet(s->pb, packet, ts->raw_packet_size);
1353 if (ret < 0)
1354 return -1;
1355 pid = AV_RB16(packet + 1) & 0x1fff;
1356 if ((pcr_pid == -1 || pcr_pid == pid) &&
1357 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1358 pcr_pid = pid;
1359 packet_count[nb_pcrs] = nb_packets;
1360 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1361 nb_pcrs++;
1362 if (nb_pcrs >= 2)
1363 break;
1364 }
1365 nb_packets++;
1366 }
1367
1368 /* NOTE1: the bitrate is computed without the FEC */
1369 /* NOTE2: it is only the bitrate of the start of the stream */
1370 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1371 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1372 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1373 st->codec->bit_rate = s->bit_rate;
1374 st->start_time = ts->cur_pcr;
1375 #if 0
1376 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1377 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1378 #endif
1379 }
1380
1381 url_fseek(pb, pos, SEEK_SET);
1382 return 0;
1383 fail:
1384 return -1;
1385 }
1386
1387 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1388
1389 static int mpegts_raw_read_packet(AVFormatContext *s,
1390 AVPacket *pkt)
1391 {
1392 MpegTSContext *ts = s->priv_data;
1393 int ret, i;
1394 int64_t pcr_h, next_pcr_h, pos;
1395 int pcr_l, next_pcr_l;
1396 uint8_t pcr_buf[12];
1397
1398 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1399 return AVERROR(ENOMEM);
1400 pkt->pos= url_ftell(s->pb);
1401 ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1402 if (ret < 0) {
1403 av_free_packet(pkt);
1404 return ret;
1405 }
1406 if (ts->mpeg2ts_compute_pcr) {
1407 /* compute exact PCR for each packet */
1408 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1409 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1410 pos = url_ftell(s->pb);
1411 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1412 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1413 get_buffer(s->pb, pcr_buf, 12);
1414 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1415 /* XXX: not precise enough */
1416 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1417 (i + 1);
1418 break;
1419 }
1420 }
1421 url_fseek(s->pb, pos, SEEK_SET);
1422 /* no next PCR found: we use previous increment */
1423 ts->cur_pcr = pcr_h * 300 + pcr_l;
1424 }
1425 pkt->pts = ts->cur_pcr;
1426 pkt->duration = ts->pcr_incr;
1427 ts->cur_pcr += ts->pcr_incr;
1428 }
1429 pkt->stream_index = 0;
1430 return 0;
1431 }
1432
1433 static int mpegts_read_packet(AVFormatContext *s,
1434 AVPacket *pkt)
1435 {
1436 MpegTSContext *ts = s->priv_data;
1437 int ret, i;
1438
1439 if (url_ftell(s->pb) != ts->last_pos) {
1440 /* seek detected, flush pes buffer */
1441 for (i = 0; i < NB_PID_MAX; i++) {
1442 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1443 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1444 av_freep(&pes->buffer);
1445 pes->data_index = 0;
1446 pes->state = MPEGTS_SKIP; /* skip until pes header */
1447 }
1448 }
1449 }
1450
1451 ts->pkt = pkt;
1452 ret = handle_packets(ts, 0);
1453 if (ret < 0) {
1454 /* flush pes data left */
1455 for (i = 0; i < NB_PID_MAX; i++) {
1456 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1457 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1458 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1459 new_pes_packet(pes, pkt);
1460 ret = 0;
1461 break;
1462 }
1463 }
1464 }
1465 }
1466
1467 ts->last_pos = url_ftell(s->pb);
1468
1469 return ret;
1470 }
1471
1472 static int mpegts_read_close(AVFormatContext *s)
1473 {
1474 MpegTSContext *ts = s->priv_data;
1475 int i;
1476
1477 clear_programs(ts);
1478
1479 for(i=0;i<NB_PID_MAX;i++)
1480 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1481
1482 return 0;
1483 }
1484
1485 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1486 int64_t *ppos, int64_t pos_limit)
1487 {
1488 MpegTSContext *ts = s->priv_data;
1489 int64_t pos, timestamp;
1490 uint8_t buf[TS_PACKET_SIZE];
1491 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1492 const int find_next= 1;
1493 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1494 if (find_next) {
1495 for(;;) {
1496 url_fseek(s->pb, pos, SEEK_SET);
1497 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1498 return AV_NOPTS_VALUE;
1499 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1500 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1501 break;
1502 }
1503 pos += ts->raw_packet_size;
1504 }
1505 } else {
1506 for(;;) {
1507 pos -= ts->raw_packet_size;
1508 if (pos < 0)
1509 return AV_NOPTS_VALUE;
1510 url_fseek(s->pb, pos, SEEK_SET);
1511 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1512 return AV_NOPTS_VALUE;
1513 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1514 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1515 break;
1516 }
1517 }
1518 }
1519 *ppos = pos;
1520
1521 return timestamp;
1522 }
1523
1524 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1525 MpegTSContext *ts = s->priv_data;
1526 uint8_t buf[TS_PACKET_SIZE];
1527 int64_t pos;
1528
1529 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1530 return -1;
1531
1532 pos= url_ftell(s->pb);
1533
1534 for(;;) {
1535 url_fseek(s->pb, pos, SEEK_SET);
1536 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1537 return -1;
1538 // pid = AV_RB16(buf + 1) & 0x1fff;
1539 if(buf[1] & 0x40) break;
1540 pos += ts->raw_packet_size;
1541 }
1542 url_fseek(s->pb, pos, SEEK_SET);
1543
1544 return 0;
1545 }
1546
1547 /**************************************************************/
1548 /* parsing functions - called from other demuxers such as RTP */
1549
1550 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1551 {
1552 MpegTSContext *ts;
1553
1554 ts = av_mallocz(sizeof(MpegTSContext));
1555 if (!ts)
1556 return NULL;
1557 /* no stream case, currently used by RTP */
1558 ts->raw_packet_size = TS_PACKET_SIZE;
1559 ts->stream = s;
1560 ts->auto_guess = 1;
1561 return ts;
1562 }
1563
1564 /* return the consumed length if a packet was output, or -1 if no
1565 packet is output */
1566 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1567 const uint8_t *buf, int len)
1568 {
1569 int len1;
1570
1571 len1 = len;
1572 ts->pkt = pkt;
1573 ts->stop_parse = 0;
1574 for(;;) {
1575 if (ts->stop_parse>0)
1576 break;
1577 if (len < TS_PACKET_SIZE)
1578 return -1;
1579 if (buf[0] != 0x47) {
1580 buf++;
1581 len--;
1582 } else {
1583 handle_packet(ts, buf);
1584 buf += TS_PACKET_SIZE;
1585 len -= TS_PACKET_SIZE;
1586 }
1587 }
1588 return len1 - len;
1589 }
1590
1591 void mpegts_parse_close(MpegTSContext *ts)
1592 {
1593 int i;
1594
1595 for(i=0;i<NB_PID_MAX;i++)
1596 av_free(ts->pids[i]);
1597 av_free(ts);
1598 }
1599
1600 AVInputFormat mpegts_demuxer = {
1601 "mpegts",
1602 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1603 sizeof(MpegTSContext),
1604 mpegts_probe,
1605 mpegts_read_header,
1606 mpegts_read_packet,
1607 mpegts_read_close,
1608 read_seek,
1609 mpegts_get_pcr,
1610 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1611 };
1612
1613 AVInputFormat mpegtsraw_demuxer = {
1614 "mpegtsraw",
1615 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1616 sizeof(MpegTSContext),
1617 NULL,
1618 mpegts_read_header,
1619 mpegts_raw_read_packet,
1620 mpegts_read_close,
1621 read_seek,
1622 mpegts_get_pcr,
1623 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1624 };
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