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Add a VorbisComment metadata conversion table and use it in the FLAC and
[FFMpeg-mirror/lagarith.git] / libavformat / mpegts.c
blob031c460dd62fc48267dc9a29babc78e7cc302fb4
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 };
532
533 static void mpegts_find_stream_type(AVStream *st,
534 uint32_t stream_type, const StreamType *types)
535 {
536 for (; types->stream_type; types++) {
537 if (stream_type == types->stream_type) {
538 st->codec->codec_type = types->codec_type;
539 st->codec->codec_id = types->codec_id;
540 return;
541 }
542 }
543 }
544
545 static AVStream *new_pes_av_stream(PESContext *pes, uint32_t prog_reg_desc, uint32_t code)
546 {
547 AVStream *st = av_new_stream(pes->stream, pes->pid);
548
549 if (!st)
550 return NULL;
551
552 av_set_pts_info(st, 33, 1, 90000);
553 st->priv_data = pes;
554 st->codec->codec_type = CODEC_TYPE_DATA;
555 st->codec->codec_id = CODEC_ID_PROBE;
556 st->need_parsing = AVSTREAM_PARSE_FULL;
557 pes->st = st;
558
559 dprintf(pes->stream, "stream_type=%x pid=%x prog_reg_desc=%.4s\n",
560 pes->stream_type, pes->pid, (char*)&prog_reg_desc);
561
562 st->codec->codec_tag = pes->stream_type;
563
564 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
565 if (prog_reg_desc == AV_RL32("HDMV") &&
566 st->codec->codec_id == CODEC_ID_PROBE)
567 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
568 if (st->codec->codec_id == CODEC_ID_PROBE)
569 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
570
571 /* stream was not present in PMT, guess based on PES start code */
572 if (st->codec->codec_id == CODEC_ID_PROBE) {
573 if (code >= 0x1c0 && code <= 0x1df) {
574 st->codec->codec_type = CODEC_TYPE_AUDIO;
575 st->codec->codec_id = CODEC_ID_MP2;
576 } else if (code == 0x1bd) {
577 st->codec->codec_type = CODEC_TYPE_AUDIO;
578 st->codec->codec_id = CODEC_ID_AC3;
579 }
580 }
581
582 return st;
583 }
584
585 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
586 {
587 MpegTSContext *ts = filter->u.section_filter.opaque;
588 SectionHeader h1, *h = &h1;
589 PESContext *pes;
590 AVStream *st;
591 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
592 int program_info_length, pcr_pid, pid, stream_type;
593 int desc_list_len, desc_len, desc_tag;
594 int comp_page, anc_page;
595 char language[4];
596 uint32_t prog_reg_desc = 0; /* registration descriptor */
597
598 #ifdef DEBUG
599 dprintf(ts->stream, "PMT: len %i\n", section_len);
600 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
601 #endif
602
603 p_end = section + section_len - 4;
604 p = section;
605 if (parse_section_header(h, &p, p_end) < 0)
606 return;
607
608 dprintf(ts->stream, "sid=0x%x sec_num=%d/%d\n",
609 h->id, h->sec_num, h->last_sec_num);
610
611 if (h->tid != PMT_TID)
612 return;
613
614 clear_program(ts, h->id);
615 pcr_pid = get16(&p, p_end) & 0x1fff;
616 if (pcr_pid < 0)
617 return;
618 add_pid_to_pmt(ts, h->id, pcr_pid);
619
620 dprintf(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
621
622 program_info_length = get16(&p, p_end) & 0xfff;
623 if (program_info_length < 0)
624 return;
625 while(program_info_length >= 2) {
626 uint8_t tag, len;
627 tag = get8(&p, p_end);
628 len = get8(&p, p_end);
629 if(len > program_info_length - 2)
630 //something else is broken, exit the program_descriptors_loop
631 break;
632 program_info_length -= len + 2;
633 if(tag == 0x05 && len >= 4) { // registration descriptor
634 prog_reg_desc = bytestream_get_le32(&p);
635 len -= 4;
636 }
637 p += len;
638 }
639 p += program_info_length;
640 if (p >= p_end)
641 return;
642 for(;;) {
643 st = 0;
644 stream_type = get8(&p, p_end);
645 if (stream_type < 0)
646 break;
647 pid = get16(&p, p_end) & 0x1fff;
648 if (pid < 0)
649 break;
650
651 /* now create ffmpeg stream */
652 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
653 pes = ts->pids[pid]->u.pes_filter.opaque;
654 st = pes->st;
655 } else {
656 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
657 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
658 if (pes)
659 st = new_pes_av_stream(pes, prog_reg_desc, 0);
660 }
661
662 if (!st)
663 return;
664
665 add_pid_to_pmt(ts, h->id, pid);
666
667 av_program_add_stream_index(ts->stream, h->id, st->index);
668
669 desc_list_len = get16(&p, p_end) & 0xfff;
670 if (desc_list_len < 0)
671 break;
672 desc_list_end = p + desc_list_len;
673 if (desc_list_end > p_end)
674 break;
675 for(;;) {
676 desc_tag = get8(&p, desc_list_end);
677 if (desc_tag < 0)
678 break;
679 desc_len = get8(&p, desc_list_end);
680 if (desc_len < 0)
681 break;
682 desc_end = p + desc_len;
683 if (desc_end > desc_list_end)
684 break;
685
686 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
687 desc_tag, desc_len);
688
689 if (st->codec->codec_id == CODEC_ID_PROBE &&
690 stream_type == STREAM_TYPE_PRIVATE_DATA)
691 mpegts_find_stream_type(st, desc_tag, DESC_types);
692
693 switch(desc_tag) {
694 case 0x59: /* subtitling descriptor */
695 language[0] = get8(&p, desc_end);
696 language[1] = get8(&p, desc_end);
697 language[2] = get8(&p, desc_end);
698 language[3] = 0;
699 get8(&p, desc_end);
700 comp_page = get16(&p, desc_end);
701 anc_page = get16(&p, desc_end);
702 st->codec->sub_id = (anc_page << 16) | comp_page;
703 av_metadata_set(&st->metadata, "language", language);
704 break;
705 case 0x0a: /* ISO 639 language descriptor */
706 language[0] = get8(&p, desc_end);
707 language[1] = get8(&p, desc_end);
708 language[2] = get8(&p, desc_end);
709 language[3] = 0;
710 av_metadata_set(&st->metadata, "language", language);
711 break;
712 case 0x05: /* registration descriptor */
713 st->codec->codec_tag = bytestream_get_le32(&p);
714 dprintf(ts->stream, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
715 if (st->codec->codec_id == CODEC_ID_PROBE &&
716 stream_type == STREAM_TYPE_PRIVATE_DATA)
717 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
718 break;
719 default:
720 break;
721 }
722 p = desc_end;
723 }
724 p = desc_list_end;
725 }
726 /* all parameters are there */
727 ts->stop_parse++;
728 mpegts_close_filter(ts, filter);
729 }
730
731 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
732 {
733 MpegTSContext *ts = filter->u.section_filter.opaque;
734 SectionHeader h1, *h = &h1;
735 const uint8_t *p, *p_end;
736 int sid, pmt_pid;
737
738 #ifdef DEBUG
739 dprintf(ts->stream, "PAT:\n");
740 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
741 #endif
742 p_end = section + section_len - 4;
743 p = section;
744 if (parse_section_header(h, &p, p_end) < 0)
745 return;
746 if (h->tid != PAT_TID)
747 return;
748
749 clear_programs(ts);
750 for(;;) {
751 sid = get16(&p, p_end);
752 if (sid < 0)
753 break;
754 pmt_pid = get16(&p, p_end) & 0x1fff;
755 if (pmt_pid < 0)
756 break;
757
758 dprintf(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
759
760 if (sid == 0x0000) {
761 /* NIT info */
762 } else {
763 av_new_program(ts->stream, sid);
764 ts->stop_parse--;
765 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
766 add_pat_entry(ts, sid);
767 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
768 add_pid_to_pmt(ts, sid, pmt_pid);
769 }
770 }
771 /* not found */
772 ts->stop_parse++;
773
774 mpegts_close_filter(ts, filter);
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 } else {
958 pes->state = MPEGTS_PAYLOAD;
959 pes->data_index = 0;
960 }
961 } else {
962 /* otherwise, it should be a table */
963 /* skip packet */
964 skip:
965 pes->state = MPEGTS_SKIP;
966 continue;
967 }
968 }
969 break;
970 /**********************************************/
971 /* PES packing parsing */
972 case MPEGTS_PESHEADER:
973 len = PES_HEADER_SIZE - pes->data_index;
974 if (len < 0)
975 return -1;
976 if (len > buf_size)
977 len = buf_size;
978 memcpy(pes->header + pes->data_index, p, len);
979 pes->data_index += len;
980 p += len;
981 buf_size -= len;
982 if (pes->data_index == PES_HEADER_SIZE) {
983 pes->pes_header_size = pes->header[8] + 9;
984 pes->state = MPEGTS_PESHEADER_FILL;
985 }
986 break;
987 case MPEGTS_PESHEADER_FILL:
988 len = pes->pes_header_size - pes->data_index;
989 if (len < 0)
990 return -1;
991 if (len > buf_size)
992 len = buf_size;
993 memcpy(pes->header + pes->data_index, p, len);
994 pes->data_index += len;
995 p += len;
996 buf_size -= len;
997 if (pes->data_index == pes->pes_header_size) {
998 const uint8_t *r;
999 unsigned int flags;
1000
1001 flags = pes->header[7];
1002 r = pes->header + 9;
1003 pes->pts = AV_NOPTS_VALUE;
1004 pes->dts = AV_NOPTS_VALUE;
1005 if ((flags & 0xc0) == 0x80) {
1006 pes->dts = pes->pts = get_pts(r);
1007 r += 5;
1008 } else if ((flags & 0xc0) == 0xc0) {
1009 pes->pts = get_pts(r);
1010 r += 5;
1011 pes->dts = get_pts(r);
1012 r += 5;
1013 }
1014
1015 /* we got the full header. We parse it and get the payload */
1016 pes->state = MPEGTS_PAYLOAD;
1017 pes->data_index = 0;
1018 }
1019 break;
1020 case MPEGTS_PAYLOAD:
1021 if (buf_size > 0) {
1022 if (pes->data_index+buf_size > pes->total_size) {
1023 new_pes_packet(pes, ts->pkt);
1024 pes->total_size = MAX_PES_PAYLOAD;
1025 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
1026 if (!pes->buffer)
1027 return AVERROR(ENOMEM);
1028 ts->stop_parse = 1;
1029 }
1030 memcpy(pes->buffer+pes->data_index, p, buf_size);
1031 pes->data_index += buf_size;
1032 }
1033 buf_size = 0;
1034 break;
1035 case MPEGTS_SKIP:
1036 buf_size = 0;
1037 break;
1038 }
1039 }
1040
1041 return 0;
1042 }
1043
1044 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
1045 {
1046 MpegTSFilter *tss;
1047 PESContext *pes;
1048
1049 /* if no pid found, then add a pid context */
1050 pes = av_mallocz(sizeof(PESContext));
1051 if (!pes)
1052 return 0;
1053 pes->ts = ts;
1054 pes->stream = ts->stream;
1055 pes->pid = pid;
1056 pes->pcr_pid = pcr_pid;
1057 pes->stream_type = stream_type;
1058 pes->state = MPEGTS_SKIP;
1059 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1060 if (!tss) {
1061 av_free(pes);
1062 return 0;
1063 }
1064 return pes;
1065 }
1066
1067 /* handle one TS packet */
1068 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1069 {
1070 AVFormatContext *s = ts->stream;
1071 MpegTSFilter *tss;
1072 int len, pid, cc, cc_ok, afc, is_start;
1073 const uint8_t *p, *p_end;
1074 int64_t pos;
1075
1076 pid = AV_RB16(packet + 1) & 0x1fff;
1077 if(pid && discard_pid(ts, pid))
1078 return 0;
1079 is_start = packet[1] & 0x40;
1080 tss = ts->pids[pid];
1081 if (ts->auto_guess && tss == NULL && is_start) {
1082 add_pes_stream(ts, pid, -1, 0);
1083 tss = ts->pids[pid];
1084 }
1085 if (!tss)
1086 return 0;
1087
1088 /* continuity check (currently not used) */
1089 cc = (packet[3] & 0xf);
1090 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1091 tss->last_cc = cc;
1092
1093 /* skip adaptation field */
1094 afc = (packet[3] >> 4) & 3;
1095 p = packet + 4;
1096 if (afc == 0) /* reserved value */
1097 return 0;
1098 if (afc == 2) /* adaptation field only */
1099 return 0;
1100 if (afc == 3) {
1101 /* skip adapation field */
1102 p += p[0] + 1;
1103 }
1104 /* if past the end of packet, ignore */
1105 p_end = packet + TS_PACKET_SIZE;
1106 if (p >= p_end)
1107 return 0;
1108
1109 pos = url_ftell(ts->stream->pb);
1110 ts->pos47= pos % ts->raw_packet_size;
1111
1112 if (tss->type == MPEGTS_SECTION) {
1113 if (is_start) {
1114 /* pointer field present */
1115 len = *p++;
1116 if (p + len > p_end)
1117 return 0;
1118 if (len && cc_ok) {
1119 /* write remaining section bytes */
1120 write_section_data(s, tss,
1121 p, len, 0);
1122 /* check whether filter has been closed */
1123 if (!ts->pids[pid])
1124 return 0;
1125 }
1126 p += len;
1127 if (p < p_end) {
1128 write_section_data(s, tss,
1129 p, p_end - p, 1);
1130 }
1131 } else {
1132 if (cc_ok) {
1133 write_section_data(s, tss,
1134 p, p_end - p, 0);
1135 }
1136 }
1137 } else {
1138 int ret;
1139 // Note: The position here points actually behind the current packet.
1140 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1141 pos - ts->raw_packet_size)) < 0)
1142 return ret;
1143 }
1144
1145 return 0;
1146 }
1147
1148 /* XXX: try to find a better synchro over several packets (use
1149 get_packet_size() ?) */
1150 static int mpegts_resync(ByteIOContext *pb)
1151 {
1152 int c, i;
1153
1154 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1155 c = url_fgetc(pb);
1156 if (c < 0)
1157 return -1;
1158 if (c == 0x47) {
1159 url_fseek(pb, -1, SEEK_CUR);
1160 return 0;
1161 }
1162 }
1163 /* no sync found */
1164 return -1;
1165 }
1166
1167 /* return -1 if error or EOF. Return 0 if OK. */
1168 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1169 {
1170 int skip, len;
1171
1172 for(;;) {
1173 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1174 if (len != TS_PACKET_SIZE)
1175 return AVERROR(EIO);
1176 /* check paquet sync byte */
1177 if (buf[0] != 0x47) {
1178 /* find a new packet start */
1179 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1180 if (mpegts_resync(pb) < 0)
1181 return AVERROR_INVALIDDATA;
1182 else
1183 continue;
1184 } else {
1185 skip = raw_packet_size - TS_PACKET_SIZE;
1186 if (skip > 0)
1187 url_fskip(pb, skip);
1188 break;
1189 }
1190 }
1191 return 0;
1192 }
1193
1194 static int handle_packets(MpegTSContext *ts, int nb_packets)
1195 {
1196 AVFormatContext *s = ts->stream;
1197 ByteIOContext *pb = s->pb;
1198 uint8_t packet[TS_PACKET_SIZE];
1199 int packet_num, ret;
1200
1201 ts->stop_parse = 0;
1202 packet_num = 0;
1203 for(;;) {
1204 if (ts->stop_parse>0)
1205 break;
1206 packet_num++;
1207 if (nb_packets != 0 && packet_num >= nb_packets)
1208 break;
1209 ret = read_packet(pb, packet, ts->raw_packet_size);
1210 if (ret != 0)
1211 return ret;
1212 ret = handle_packet(ts, packet);
1213 if (ret != 0)
1214 return ret;
1215 }
1216 return 0;
1217 }
1218
1219 static int mpegts_probe(AVProbeData *p)
1220 {
1221 #if 1
1222 const int size= p->buf_size;
1223 int score, fec_score, dvhs_score;
1224 int check_count= size / TS_FEC_PACKET_SIZE;
1225 #define CHECK_COUNT 10
1226
1227 if (check_count < CHECK_COUNT)
1228 return -1;
1229
1230 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1231 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1232 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1233 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1234
1235 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1236 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1237 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1238 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1239 else return -1;
1240 #else
1241 /* only use the extension for safer guess */
1242 if (match_ext(p->filename, "ts"))
1243 return AVPROBE_SCORE_MAX;
1244 else
1245 return 0;
1246 #endif
1247 }
1248
1249 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1250 (-1) if not available */
1251 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1252 const uint8_t *packet)
1253 {
1254 int afc, len, flags;
1255 const uint8_t *p;
1256 unsigned int v;
1257
1258 afc = (packet[3] >> 4) & 3;
1259 if (afc <= 1)
1260 return -1;
1261 p = packet + 4;
1262 len = p[0];
1263 p++;
1264 if (len == 0)
1265 return -1;
1266 flags = *p++;
1267 len--;
1268 if (!(flags & 0x10))
1269 return -1;
1270 if (len < 6)
1271 return -1;
1272 v = AV_RB32(p);
1273 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1274 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1275 return 0;
1276 }
1277
1278 static int mpegts_read_header(AVFormatContext *s,
1279 AVFormatParameters *ap)
1280 {
1281 MpegTSContext *ts = s->priv_data;
1282 ByteIOContext *pb = s->pb;
1283 uint8_t buf[5*1024];
1284 int len;
1285 int64_t pos;
1286
1287 if (ap) {
1288 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1289 if(ap->mpeg2ts_raw){
1290 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1291 return -1;
1292 }
1293 }
1294
1295 /* read the first 1024 bytes to get packet size */
1296 pos = url_ftell(pb);
1297 len = get_buffer(pb, buf, sizeof(buf));
1298 if (len != sizeof(buf))
1299 goto fail;
1300 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1301 if (ts->raw_packet_size <= 0)
1302 goto fail;
1303 ts->stream = s;
1304 ts->auto_guess = 0;
1305
1306 if (s->iformat == &mpegts_demuxer) {
1307 /* normal demux */
1308
1309 /* first do a scaning to get all the services */
1310 url_fseek(pb, pos, SEEK_SET);
1311
1312 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1313
1314 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1315
1316 handle_packets(ts, s->probesize);
1317 /* if could not find service, enable auto_guess */
1318
1319 ts->auto_guess = 1;
1320
1321 dprintf(ts->stream, "tuning done\n");
1322
1323 s->ctx_flags |= AVFMTCTX_NOHEADER;
1324 } else {
1325 AVStream *st;
1326 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1327 int64_t pcrs[2], pcr_h;
1328 int packet_count[2];
1329 uint8_t packet[TS_PACKET_SIZE];
1330
1331 /* only read packets */
1332
1333 st = av_new_stream(s, 0);
1334 if (!st)
1335 goto fail;
1336 av_set_pts_info(st, 60, 1, 27000000);
1337 st->codec->codec_type = CODEC_TYPE_DATA;
1338 st->codec->codec_id = CODEC_ID_MPEG2TS;
1339
1340 /* we iterate until we find two PCRs to estimate the bitrate */
1341 pcr_pid = -1;
1342 nb_pcrs = 0;
1343 nb_packets = 0;
1344 for(;;) {
1345 ret = read_packet(s->pb, packet, ts->raw_packet_size);
1346 if (ret < 0)
1347 return -1;
1348 pid = AV_RB16(packet + 1) & 0x1fff;
1349 if ((pcr_pid == -1 || pcr_pid == pid) &&
1350 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1351 pcr_pid = pid;
1352 packet_count[nb_pcrs] = nb_packets;
1353 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1354 nb_pcrs++;
1355 if (nb_pcrs >= 2)
1356 break;
1357 }
1358 nb_packets++;
1359 }
1360
1361 /* NOTE1: the bitrate is computed without the FEC */
1362 /* NOTE2: it is only the bitrate of the start of the stream */
1363 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1364 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1365 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1366 st->codec->bit_rate = s->bit_rate;
1367 st->start_time = ts->cur_pcr;
1368 #if 0
1369 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1370 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1371 #endif
1372 }
1373
1374 url_fseek(pb, pos, SEEK_SET);
1375 return 0;
1376 fail:
1377 return -1;
1378 }
1379
1380 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1381
1382 static int mpegts_raw_read_packet(AVFormatContext *s,
1383 AVPacket *pkt)
1384 {
1385 MpegTSContext *ts = s->priv_data;
1386 int ret, i;
1387 int64_t pcr_h, next_pcr_h, pos;
1388 int pcr_l, next_pcr_l;
1389 uint8_t pcr_buf[12];
1390
1391 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1392 return AVERROR(ENOMEM);
1393 pkt->pos= url_ftell(s->pb);
1394 ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1395 if (ret < 0) {
1396 av_free_packet(pkt);
1397 return ret;
1398 }
1399 if (ts->mpeg2ts_compute_pcr) {
1400 /* compute exact PCR for each packet */
1401 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1402 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1403 pos = url_ftell(s->pb);
1404 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1405 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1406 get_buffer(s->pb, pcr_buf, 12);
1407 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1408 /* XXX: not precise enough */
1409 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1410 (i + 1);
1411 break;
1412 }
1413 }
1414 url_fseek(s->pb, pos, SEEK_SET);
1415 /* no next PCR found: we use previous increment */
1416 ts->cur_pcr = pcr_h * 300 + pcr_l;
1417 }
1418 pkt->pts = ts->cur_pcr;
1419 pkt->duration = ts->pcr_incr;
1420 ts->cur_pcr += ts->pcr_incr;
1421 }
1422 pkt->stream_index = 0;
1423 return 0;
1424 }
1425
1426 static int mpegts_read_packet(AVFormatContext *s,
1427 AVPacket *pkt)
1428 {
1429 MpegTSContext *ts = s->priv_data;
1430 int ret, i;
1431
1432 if (url_ftell(s->pb) != ts->last_pos) {
1433 /* seek detected, flush pes buffer */
1434 for (i = 0; i < NB_PID_MAX; i++) {
1435 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1436 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1437 av_freep(&pes->buffer);
1438 pes->data_index = 0;
1439 pes->state = MPEGTS_SKIP; /* skip until pes header */
1440 }
1441 }
1442 }
1443
1444 ts->pkt = pkt;
1445 ret = handle_packets(ts, 0);
1446 if (ret < 0) {
1447 /* flush pes data left */
1448 for (i = 0; i < NB_PID_MAX; i++) {
1449 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1450 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1451 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1452 new_pes_packet(pes, pkt);
1453 ret = 0;
1454 break;
1455 }
1456 }
1457 }
1458 }
1459
1460 ts->last_pos = url_ftell(s->pb);
1461
1462 return ret;
1463 }
1464
1465 static int mpegts_read_close(AVFormatContext *s)
1466 {
1467 MpegTSContext *ts = s->priv_data;
1468 int i;
1469
1470 clear_programs(ts);
1471
1472 for(i=0;i<NB_PID_MAX;i++)
1473 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1474
1475 return 0;
1476 }
1477
1478 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1479 int64_t *ppos, int64_t pos_limit)
1480 {
1481 MpegTSContext *ts = s->priv_data;
1482 int64_t pos, timestamp;
1483 uint8_t buf[TS_PACKET_SIZE];
1484 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1485 const int find_next= 1;
1486 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1487 if (find_next) {
1488 for(;;) {
1489 url_fseek(s->pb, pos, SEEK_SET);
1490 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1491 return AV_NOPTS_VALUE;
1492 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1493 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1494 break;
1495 }
1496 pos += ts->raw_packet_size;
1497 }
1498 } else {
1499 for(;;) {
1500 pos -= ts->raw_packet_size;
1501 if (pos < 0)
1502 return AV_NOPTS_VALUE;
1503 url_fseek(s->pb, pos, SEEK_SET);
1504 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1505 return AV_NOPTS_VALUE;
1506 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1507 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1508 break;
1509 }
1510 }
1511 }
1512 *ppos = pos;
1513
1514 return timestamp;
1515 }
1516
1517 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1518 MpegTSContext *ts = s->priv_data;
1519 uint8_t buf[TS_PACKET_SIZE];
1520 int64_t pos;
1521
1522 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1523 return -1;
1524
1525 pos= url_ftell(s->pb);
1526
1527 for(;;) {
1528 url_fseek(s->pb, pos, SEEK_SET);
1529 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1530 return -1;
1531 // pid = AV_RB16(buf + 1) & 0x1fff;
1532 if(buf[1] & 0x40) break;
1533 pos += ts->raw_packet_size;
1534 }
1535 url_fseek(s->pb, pos, SEEK_SET);
1536
1537 return 0;
1538 }
1539
1540 /**************************************************************/
1541 /* parsing functions - called from other demuxers such as RTP */
1542
1543 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1544 {
1545 MpegTSContext *ts;
1546
1547 ts = av_mallocz(sizeof(MpegTSContext));
1548 if (!ts)
1549 return NULL;
1550 /* no stream case, currently used by RTP */
1551 ts->raw_packet_size = TS_PACKET_SIZE;
1552 ts->stream = s;
1553 ts->auto_guess = 1;
1554 return ts;
1555 }
1556
1557 /* return the consumed length if a packet was output, or -1 if no
1558 packet is output */
1559 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1560 const uint8_t *buf, int len)
1561 {
1562 int len1;
1563
1564 len1 = len;
1565 ts->pkt = pkt;
1566 ts->stop_parse = 0;
1567 for(;;) {
1568 if (ts->stop_parse>0)
1569 break;
1570 if (len < TS_PACKET_SIZE)
1571 return -1;
1572 if (buf[0] != 0x47) {
1573 buf++;
1574 len--;
1575 } else {
1576 handle_packet(ts, buf);
1577 buf += TS_PACKET_SIZE;
1578 len -= TS_PACKET_SIZE;
1579 }
1580 }
1581 return len1 - len;
1582 }
1583
1584 void mpegts_parse_close(MpegTSContext *ts)
1585 {
1586 int i;
1587
1588 for(i=0;i<NB_PID_MAX;i++)
1589 av_free(ts->pids[i]);
1590 av_free(ts);
1591 }
1592
1593 AVInputFormat mpegts_demuxer = {
1594 "mpegts",
1595 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1596 sizeof(MpegTSContext),
1597 mpegts_probe,
1598 mpegts_read_header,
1599 mpegts_read_packet,
1600 mpegts_read_close,
1601 read_seek,
1602 mpegts_get_pcr,
1603 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1604 };
1605
1606 AVInputFormat mpegtsraw_demuxer = {
1607 "mpegtsraw",
1608 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1609 sizeof(MpegTSContext),
1610 NULL,
1611 mpegts_read_header,
1612 mpegts_raw_read_packet,
1613 mpegts_read_close,
1614 read_seek,
1615 mpegts_get_pcr,
1616 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1617 };
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