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oggenc: return error value from ogg_build_flac_headers()
[FFMpeg-mirror/lagarith.git] / libavformat / mpegts.c
blob921ddd5e39b3aa30a3dc426d2ff6d70653ed5215
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_PROBE;
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_PROBE)
568 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
569 if (st->codec->codec_id == CODEC_ID_PROBE)
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_PROBE) {
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 for(;;) {
644 st = 0;
645 stream_type = get8(&p, p_end);
646 if (stream_type < 0)
647 break;
648 pid = get16(&p, p_end) & 0x1fff;
649 if (pid < 0)
650 break;
651
652 /* now create ffmpeg stream */
653 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
654 pes = ts->pids[pid]->u.pes_filter.opaque;
655 st = pes->st;
656 } else {
657 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
658 pes = add_pes_stream(ts, pid, pcr_pid, stream_type);
659 if (pes)
660 st = new_pes_av_stream(pes, prog_reg_desc, 0);
661 }
662
663 if (!st)
664 return;
665
666 add_pid_to_pmt(ts, h->id, pid);
667
668 av_program_add_stream_index(ts->stream, h->id, st->index);
669
670 desc_list_len = get16(&p, p_end) & 0xfff;
671 if (desc_list_len < 0)
672 break;
673 desc_list_end = p + desc_list_len;
674 if (desc_list_end > p_end)
675 break;
676 for(;;) {
677 desc_tag = get8(&p, desc_list_end);
678 if (desc_tag < 0)
679 break;
680 desc_len = get8(&p, desc_list_end);
681 if (desc_len < 0)
682 break;
683 desc_end = p + desc_len;
684 if (desc_end > desc_list_end)
685 break;
686
687 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
688 desc_tag, desc_len);
689
690 if (st->codec->codec_id == CODEC_ID_PROBE &&
691 stream_type == STREAM_TYPE_PRIVATE_DATA)
692 mpegts_find_stream_type(st, desc_tag, DESC_types);
693
694 switch(desc_tag) {
695 case 0x59: /* subtitling descriptor */
696 language[0] = get8(&p, desc_end);
697 language[1] = get8(&p, desc_end);
698 language[2] = get8(&p, desc_end);
699 language[3] = 0;
700 get8(&p, desc_end);
701 comp_page = get16(&p, desc_end);
702 anc_page = get16(&p, desc_end);
703 st->codec->sub_id = (anc_page << 16) | comp_page;
704 av_metadata_set(&st->metadata, "language", language);
705 break;
706 case 0x0a: /* ISO 639 language descriptor */
707 language[0] = get8(&p, desc_end);
708 language[1] = get8(&p, desc_end);
709 language[2] = get8(&p, desc_end);
710 language[3] = 0;
711 av_metadata_set(&st->metadata, "language", language);
712 break;
713 case 0x05: /* registration descriptor */
714 st->codec->codec_tag = bytestream_get_le32(&p);
715 dprintf(ts->stream, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
716 if (st->codec->codec_id == CODEC_ID_PROBE &&
717 stream_type == STREAM_TYPE_PRIVATE_DATA)
718 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
719 break;
720 default:
721 break;
722 }
723 p = desc_end;
724 }
725 p = desc_list_end;
726 }
727 /* all parameters are there */
728 ts->stop_parse++;
729 mpegts_close_filter(ts, filter);
730 }
731
732 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
733 {
734 MpegTSContext *ts = filter->u.section_filter.opaque;
735 SectionHeader h1, *h = &h1;
736 const uint8_t *p, *p_end;
737 int sid, pmt_pid;
738
739 #ifdef DEBUG
740 dprintf(ts->stream, "PAT:\n");
741 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
742 #endif
743 p_end = section + section_len - 4;
744 p = section;
745 if (parse_section_header(h, &p, p_end) < 0)
746 return;
747 if (h->tid != PAT_TID)
748 return;
749
750 clear_programs(ts);
751 for(;;) {
752 sid = get16(&p, p_end);
753 if (sid < 0)
754 break;
755 pmt_pid = get16(&p, p_end) & 0x1fff;
756 if (pmt_pid < 0)
757 break;
758
759 dprintf(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
760
761 if (sid == 0x0000) {
762 /* NIT info */
763 } else {
764 av_new_program(ts->stream, sid);
765 ts->stop_parse--;
766 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
767 add_pat_entry(ts, sid);
768 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
769 add_pid_to_pmt(ts, sid, pmt_pid);
770 }
771 }
772 /* not found */
773 ts->stop_parse++;
774
775 mpegts_close_filter(ts, filter);
776 }
777
778 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
779 {
780 MpegTSContext *ts = filter->u.section_filter.opaque;
781 SectionHeader h1, *h = &h1;
782 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
783 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
784 char *name, *provider_name;
785
786 #ifdef DEBUG
787 dprintf(ts->stream, "SDT:\n");
788 av_hex_dump_log(ts->stream, AV_LOG_DEBUG, (uint8_t *)section, section_len);
789 #endif
790
791 p_end = section + section_len - 4;
792 p = section;
793 if (parse_section_header(h, &p, p_end) < 0)
794 return;
795 if (h->tid != SDT_TID)
796 return;
797 onid = get16(&p, p_end);
798 if (onid < 0)
799 return;
800 val = get8(&p, p_end);
801 if (val < 0)
802 return;
803 for(;;) {
804 sid = get16(&p, p_end);
805 if (sid < 0)
806 break;
807 val = get8(&p, p_end);
808 if (val < 0)
809 break;
810 desc_list_len = get16(&p, p_end) & 0xfff;
811 if (desc_list_len < 0)
812 break;
813 desc_list_end = p + desc_list_len;
814 if (desc_list_end > p_end)
815 break;
816 for(;;) {
817 desc_tag = get8(&p, desc_list_end);
818 if (desc_tag < 0)
819 break;
820 desc_len = get8(&p, desc_list_end);
821 desc_end = p + desc_len;
822 if (desc_end > desc_list_end)
823 break;
824
825 dprintf(ts->stream, "tag: 0x%02x len=%d\n",
826 desc_tag, desc_len);
827
828 switch(desc_tag) {
829 case 0x48:
830 service_type = get8(&p, p_end);
831 if (service_type < 0)
832 break;
833 provider_name = getstr8(&p, p_end);
834 if (!provider_name)
835 break;
836 name = getstr8(&p, p_end);
837 if (name) {
838 AVProgram *program = av_new_program(ts->stream, sid);
839 if(program) {
840 av_metadata_set(&program->metadata, "name", name);
841 av_metadata_set(&program->metadata, "provider_name", provider_name);
842 }
843 }
844 av_free(name);
845 av_free(provider_name);
846 break;
847 default:
848 break;
849 }
850 p = desc_end;
851 }
852 p = desc_list_end;
853 }
854 }
855
856 static int64_t get_pts(const uint8_t *p)
857 {
858 int64_t pts = (int64_t)((p[0] >> 1) & 0x07) << 30;
859 pts |= (AV_RB16(p + 1) >> 1) << 15;
860 pts |= AV_RB16(p + 3) >> 1;
861 return pts;
862 }
863
864 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
865 {
866 av_init_packet(pkt);
867
868 pkt->destruct = av_destruct_packet;
869 pkt->data = pes->buffer;
870 pkt->size = pes->data_index;
871 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
872
873 pkt->stream_index = pes->st->index;
874 pkt->pts = pes->pts;
875 pkt->dts = pes->dts;
876 /* store position of first TS packet of this PES packet */
877 pkt->pos = pes->ts_packet_pos;
878
879 /* reset pts values */
880 pes->pts = AV_NOPTS_VALUE;
881 pes->dts = AV_NOPTS_VALUE;
882 pes->buffer = NULL;
883 pes->data_index = 0;
884 }
885
886 /* return non zero if a packet could be constructed */
887 static int mpegts_push_data(MpegTSFilter *filter,
888 const uint8_t *buf, int buf_size, int is_start,
889 int64_t pos)
890 {
891 PESContext *pes = filter->u.pes_filter.opaque;
892 MpegTSContext *ts = pes->ts;
893 const uint8_t *p;
894 int len, code;
895
896 if(!ts->pkt)
897 return 0;
898
899 if (is_start) {
900 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
901 new_pes_packet(pes, ts->pkt);
902 ts->stop_parse = 1;
903 }
904 pes->state = MPEGTS_HEADER;
905 pes->data_index = 0;
906 pes->ts_packet_pos = pos;
907 }
908 p = buf;
909 while (buf_size > 0) {
910 switch(pes->state) {
911 case MPEGTS_HEADER:
912 len = PES_START_SIZE - pes->data_index;
913 if (len > buf_size)
914 len = buf_size;
915 memcpy(pes->header + pes->data_index, p, len);
916 pes->data_index += len;
917 p += len;
918 buf_size -= len;
919 if (pes->data_index == PES_START_SIZE) {
920 /* we got all the PES or section header. We can now
921 decide */
922 #if 0
923 av_hex_dump_log(pes->stream, AV_LOG_DEBUG, pes->header, pes->data_index);
924 #endif
925 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
926 pes->header[2] == 0x01) {
927 /* it must be an mpeg2 PES stream */
928 code = pes->header[3] | 0x100;
929 dprintf(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
930
931 if ((!pes->st && pes->stream->nb_streams == MAX_STREAMS) ||
932 (pes->st && pes->st->discard == AVDISCARD_ALL) ||
933 code == 0x1be) /* padding_stream */
934 goto skip;
935
936 /* stream not present in PMT */
937 if (!pes->st)
938 pes->st = new_pes_av_stream(pes, 0, code);
939 if (!pes->st)
940 return AVERROR(ENOMEM);
941
942 pes->total_size = AV_RB16(pes->header + 4);
943 /* NOTE: a zero total size means the PES size is
944 unbounded */
945 if (!pes->total_size)
946 pes->total_size = MAX_PES_PAYLOAD;
947
948 /* allocate pes buffer */
949 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
950 if (!pes->buffer)
951 return AVERROR(ENOMEM);
952
953 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
954 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
955 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
956 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
957 pes->state = MPEGTS_PESHEADER;
958 } else {
959 pes->state = MPEGTS_PAYLOAD;
960 pes->data_index = 0;
961 }
962 } else {
963 /* otherwise, it should be a table */
964 /* skip packet */
965 skip:
966 pes->state = MPEGTS_SKIP;
967 continue;
968 }
969 }
970 break;
971 /**********************************************/
972 /* PES packing parsing */
973 case MPEGTS_PESHEADER:
974 len = PES_HEADER_SIZE - pes->data_index;
975 if (len < 0)
976 return -1;
977 if (len > buf_size)
978 len = buf_size;
979 memcpy(pes->header + pes->data_index, p, len);
980 pes->data_index += len;
981 p += len;
982 buf_size -= len;
983 if (pes->data_index == PES_HEADER_SIZE) {
984 pes->pes_header_size = pes->header[8] + 9;
985 pes->state = MPEGTS_PESHEADER_FILL;
986 }
987 break;
988 case MPEGTS_PESHEADER_FILL:
989 len = pes->pes_header_size - pes->data_index;
990 if (len < 0)
991 return -1;
992 if (len > buf_size)
993 len = buf_size;
994 memcpy(pes->header + pes->data_index, p, len);
995 pes->data_index += len;
996 p += len;
997 buf_size -= len;
998 if (pes->data_index == pes->pes_header_size) {
999 const uint8_t *r;
1000 unsigned int flags;
1001
1002 flags = pes->header[7];
1003 r = pes->header + 9;
1004 pes->pts = AV_NOPTS_VALUE;
1005 pes->dts = AV_NOPTS_VALUE;
1006 if ((flags & 0xc0) == 0x80) {
1007 pes->dts = pes->pts = get_pts(r);
1008 r += 5;
1009 } else if ((flags & 0xc0) == 0xc0) {
1010 pes->pts = get_pts(r);
1011 r += 5;
1012 pes->dts = get_pts(r);
1013 r += 5;
1014 }
1015
1016 /* we got the full header. We parse it and get the payload */
1017 pes->state = MPEGTS_PAYLOAD;
1018 pes->data_index = 0;
1019 }
1020 break;
1021 case MPEGTS_PAYLOAD:
1022 if (buf_size > 0) {
1023 if (pes->data_index+buf_size > pes->total_size) {
1024 new_pes_packet(pes, ts->pkt);
1025 pes->total_size = MAX_PES_PAYLOAD;
1026 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
1027 if (!pes->buffer)
1028 return AVERROR(ENOMEM);
1029 ts->stop_parse = 1;
1030 }
1031 memcpy(pes->buffer+pes->data_index, p, buf_size);
1032 pes->data_index += buf_size;
1033 }
1034 buf_size = 0;
1035 break;
1036 case MPEGTS_SKIP:
1037 buf_size = 0;
1038 break;
1039 }
1040 }
1041
1042 return 0;
1043 }
1044
1045 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid, int stream_type)
1046 {
1047 MpegTSFilter *tss;
1048 PESContext *pes;
1049
1050 /* if no pid found, then add a pid context */
1051 pes = av_mallocz(sizeof(PESContext));
1052 if (!pes)
1053 return 0;
1054 pes->ts = ts;
1055 pes->stream = ts->stream;
1056 pes->pid = pid;
1057 pes->pcr_pid = pcr_pid;
1058 pes->stream_type = stream_type;
1059 pes->state = MPEGTS_SKIP;
1060 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1061 if (!tss) {
1062 av_free(pes);
1063 return 0;
1064 }
1065 return pes;
1066 }
1067
1068 /* handle one TS packet */
1069 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1070 {
1071 AVFormatContext *s = ts->stream;
1072 MpegTSFilter *tss;
1073 int len, pid, cc, cc_ok, afc, is_start;
1074 const uint8_t *p, *p_end;
1075 int64_t pos;
1076
1077 pid = AV_RB16(packet + 1) & 0x1fff;
1078 if(pid && discard_pid(ts, pid))
1079 return 0;
1080 is_start = packet[1] & 0x40;
1081 tss = ts->pids[pid];
1082 if (ts->auto_guess && tss == NULL && is_start) {
1083 add_pes_stream(ts, pid, -1, 0);
1084 tss = ts->pids[pid];
1085 }
1086 if (!tss)
1087 return 0;
1088
1089 /* continuity check (currently not used) */
1090 cc = (packet[3] & 0xf);
1091 cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
1092 tss->last_cc = cc;
1093
1094 /* skip adaptation field */
1095 afc = (packet[3] >> 4) & 3;
1096 p = packet + 4;
1097 if (afc == 0) /* reserved value */
1098 return 0;
1099 if (afc == 2) /* adaptation field only */
1100 return 0;
1101 if (afc == 3) {
1102 /* skip adapation field */
1103 p += p[0] + 1;
1104 }
1105 /* if past the end of packet, ignore */
1106 p_end = packet + TS_PACKET_SIZE;
1107 if (p >= p_end)
1108 return 0;
1109
1110 pos = url_ftell(ts->stream->pb);
1111 ts->pos47= pos % ts->raw_packet_size;
1112
1113 if (tss->type == MPEGTS_SECTION) {
1114 if (is_start) {
1115 /* pointer field present */
1116 len = *p++;
1117 if (p + len > p_end)
1118 return 0;
1119 if (len && cc_ok) {
1120 /* write remaining section bytes */
1121 write_section_data(s, tss,
1122 p, len, 0);
1123 /* check whether filter has been closed */
1124 if (!ts->pids[pid])
1125 return 0;
1126 }
1127 p += len;
1128 if (p < p_end) {
1129 write_section_data(s, tss,
1130 p, p_end - p, 1);
1131 }
1132 } else {
1133 if (cc_ok) {
1134 write_section_data(s, tss,
1135 p, p_end - p, 0);
1136 }
1137 }
1138 } else {
1139 int ret;
1140 // Note: The position here points actually behind the current packet.
1141 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1142 pos - ts->raw_packet_size)) < 0)
1143 return ret;
1144 }
1145
1146 return 0;
1147 }
1148
1149 /* XXX: try to find a better synchro over several packets (use
1150 get_packet_size() ?) */
1151 static int mpegts_resync(ByteIOContext *pb)
1152 {
1153 int c, i;
1154
1155 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1156 c = url_fgetc(pb);
1157 if (c < 0)
1158 return -1;
1159 if (c == 0x47) {
1160 url_fseek(pb, -1, SEEK_CUR);
1161 return 0;
1162 }
1163 }
1164 /* no sync found */
1165 return -1;
1166 }
1167
1168 /* return -1 if error or EOF. Return 0 if OK. */
1169 static int read_packet(ByteIOContext *pb, uint8_t *buf, int raw_packet_size)
1170 {
1171 int skip, len;
1172
1173 for(;;) {
1174 len = get_buffer(pb, buf, TS_PACKET_SIZE);
1175 if (len != TS_PACKET_SIZE)
1176 return AVERROR(EIO);
1177 /* check paquet sync byte */
1178 if (buf[0] != 0x47) {
1179 /* find a new packet start */
1180 url_fseek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1181 if (mpegts_resync(pb) < 0)
1182 return AVERROR_INVALIDDATA;
1183 else
1184 continue;
1185 } else {
1186 skip = raw_packet_size - TS_PACKET_SIZE;
1187 if (skip > 0)
1188 url_fskip(pb, skip);
1189 break;
1190 }
1191 }
1192 return 0;
1193 }
1194
1195 static int handle_packets(MpegTSContext *ts, int nb_packets)
1196 {
1197 AVFormatContext *s = ts->stream;
1198 ByteIOContext *pb = s->pb;
1199 uint8_t packet[TS_PACKET_SIZE];
1200 int packet_num, ret;
1201
1202 ts->stop_parse = 0;
1203 packet_num = 0;
1204 for(;;) {
1205 if (ts->stop_parse>0)
1206 break;
1207 packet_num++;
1208 if (nb_packets != 0 && packet_num >= nb_packets)
1209 break;
1210 ret = read_packet(pb, packet, ts->raw_packet_size);
1211 if (ret != 0)
1212 return ret;
1213 ret = handle_packet(ts, packet);
1214 if (ret != 0)
1215 return ret;
1216 }
1217 return 0;
1218 }
1219
1220 static int mpegts_probe(AVProbeData *p)
1221 {
1222 #if 1
1223 const int size= p->buf_size;
1224 int score, fec_score, dvhs_score;
1225 int check_count= size / TS_FEC_PACKET_SIZE;
1226 #define CHECK_COUNT 10
1227
1228 if (check_count < CHECK_COUNT)
1229 return -1;
1230
1231 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1232 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1233 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1234 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1235
1236 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1237 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1238 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1239 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1240 else return -1;
1241 #else
1242 /* only use the extension for safer guess */
1243 if (match_ext(p->filename, "ts"))
1244 return AVPROBE_SCORE_MAX;
1245 else
1246 return 0;
1247 #endif
1248 }
1249
1250 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1251 (-1) if not available */
1252 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1253 const uint8_t *packet)
1254 {
1255 int afc, len, flags;
1256 const uint8_t *p;
1257 unsigned int v;
1258
1259 afc = (packet[3] >> 4) & 3;
1260 if (afc <= 1)
1261 return -1;
1262 p = packet + 4;
1263 len = p[0];
1264 p++;
1265 if (len == 0)
1266 return -1;
1267 flags = *p++;
1268 len--;
1269 if (!(flags & 0x10))
1270 return -1;
1271 if (len < 6)
1272 return -1;
1273 v = AV_RB32(p);
1274 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1275 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1276 return 0;
1277 }
1278
1279 static int mpegts_read_header(AVFormatContext *s,
1280 AVFormatParameters *ap)
1281 {
1282 MpegTSContext *ts = s->priv_data;
1283 ByteIOContext *pb = s->pb;
1284 uint8_t buf[5*1024];
1285 int len;
1286 int64_t pos;
1287
1288 if (ap) {
1289 ts->mpeg2ts_compute_pcr = ap->mpeg2ts_compute_pcr;
1290 if(ap->mpeg2ts_raw){
1291 av_log(s, AV_LOG_ERROR, "use mpegtsraw_demuxer!\n");
1292 return -1;
1293 }
1294 }
1295
1296 /* read the first 1024 bytes to get packet size */
1297 pos = url_ftell(pb);
1298 len = get_buffer(pb, buf, sizeof(buf));
1299 if (len != sizeof(buf))
1300 goto fail;
1301 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1302 if (ts->raw_packet_size <= 0)
1303 goto fail;
1304 ts->stream = s;
1305 ts->auto_guess = 0;
1306
1307 if (s->iformat == &mpegts_demuxer) {
1308 /* normal demux */
1309
1310 /* first do a scaning to get all the services */
1311 url_fseek(pb, pos, SEEK_SET);
1312
1313 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1314
1315 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1316
1317 handle_packets(ts, s->probesize);
1318 /* if could not find service, enable auto_guess */
1319
1320 ts->auto_guess = 1;
1321
1322 dprintf(ts->stream, "tuning done\n");
1323
1324 s->ctx_flags |= AVFMTCTX_NOHEADER;
1325 } else {
1326 AVStream *st;
1327 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1328 int64_t pcrs[2], pcr_h;
1329 int packet_count[2];
1330 uint8_t packet[TS_PACKET_SIZE];
1331
1332 /* only read packets */
1333
1334 st = av_new_stream(s, 0);
1335 if (!st)
1336 goto fail;
1337 av_set_pts_info(st, 60, 1, 27000000);
1338 st->codec->codec_type = CODEC_TYPE_DATA;
1339 st->codec->codec_id = CODEC_ID_MPEG2TS;
1340
1341 /* we iterate until we find two PCRs to estimate the bitrate */
1342 pcr_pid = -1;
1343 nb_pcrs = 0;
1344 nb_packets = 0;
1345 for(;;) {
1346 ret = read_packet(s->pb, packet, ts->raw_packet_size);
1347 if (ret < 0)
1348 return -1;
1349 pid = AV_RB16(packet + 1) & 0x1fff;
1350 if ((pcr_pid == -1 || pcr_pid == pid) &&
1351 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1352 pcr_pid = pid;
1353 packet_count[nb_pcrs] = nb_packets;
1354 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1355 nb_pcrs++;
1356 if (nb_pcrs >= 2)
1357 break;
1358 }
1359 nb_packets++;
1360 }
1361
1362 /* NOTE1: the bitrate is computed without the FEC */
1363 /* NOTE2: it is only the bitrate of the start of the stream */
1364 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1365 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1366 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1367 st->codec->bit_rate = s->bit_rate;
1368 st->start_time = ts->cur_pcr;
1369 #if 0
1370 av_log(ts->stream, AV_LOG_DEBUG, "start=%0.3f pcr=%0.3f incr=%d\n",
1371 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1372 #endif
1373 }
1374
1375 url_fseek(pb, pos, SEEK_SET);
1376 return 0;
1377 fail:
1378 return -1;
1379 }
1380
1381 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1382
1383 static int mpegts_raw_read_packet(AVFormatContext *s,
1384 AVPacket *pkt)
1385 {
1386 MpegTSContext *ts = s->priv_data;
1387 int ret, i;
1388 int64_t pcr_h, next_pcr_h, pos;
1389 int pcr_l, next_pcr_l;
1390 uint8_t pcr_buf[12];
1391
1392 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1393 return AVERROR(ENOMEM);
1394 pkt->pos= url_ftell(s->pb);
1395 ret = read_packet(s->pb, pkt->data, ts->raw_packet_size);
1396 if (ret < 0) {
1397 av_free_packet(pkt);
1398 return ret;
1399 }
1400 if (ts->mpeg2ts_compute_pcr) {
1401 /* compute exact PCR for each packet */
1402 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1403 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1404 pos = url_ftell(s->pb);
1405 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1406 url_fseek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1407 get_buffer(s->pb, pcr_buf, 12);
1408 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1409 /* XXX: not precise enough */
1410 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1411 (i + 1);
1412 break;
1413 }
1414 }
1415 url_fseek(s->pb, pos, SEEK_SET);
1416 /* no next PCR found: we use previous increment */
1417 ts->cur_pcr = pcr_h * 300 + pcr_l;
1418 }
1419 pkt->pts = ts->cur_pcr;
1420 pkt->duration = ts->pcr_incr;
1421 ts->cur_pcr += ts->pcr_incr;
1422 }
1423 pkt->stream_index = 0;
1424 return 0;
1425 }
1426
1427 static int mpegts_read_packet(AVFormatContext *s,
1428 AVPacket *pkt)
1429 {
1430 MpegTSContext *ts = s->priv_data;
1431 int ret, i;
1432
1433 if (url_ftell(s->pb) != ts->last_pos) {
1434 /* seek detected, flush pes buffer */
1435 for (i = 0; i < NB_PID_MAX; i++) {
1436 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1437 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1438 av_freep(&pes->buffer);
1439 pes->data_index = 0;
1440 pes->state = MPEGTS_SKIP; /* skip until pes header */
1441 }
1442 }
1443 }
1444
1445 ts->pkt = pkt;
1446 ret = handle_packets(ts, 0);
1447 if (ret < 0) {
1448 /* flush pes data left */
1449 for (i = 0; i < NB_PID_MAX; i++) {
1450 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
1451 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1452 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1453 new_pes_packet(pes, pkt);
1454 ret = 0;
1455 break;
1456 }
1457 }
1458 }
1459 }
1460
1461 ts->last_pos = url_ftell(s->pb);
1462
1463 return ret;
1464 }
1465
1466 static int mpegts_read_close(AVFormatContext *s)
1467 {
1468 MpegTSContext *ts = s->priv_data;
1469 int i;
1470
1471 clear_programs(ts);
1472
1473 for(i=0;i<NB_PID_MAX;i++)
1474 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
1475
1476 return 0;
1477 }
1478
1479 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
1480 int64_t *ppos, int64_t pos_limit)
1481 {
1482 MpegTSContext *ts = s->priv_data;
1483 int64_t pos, timestamp;
1484 uint8_t buf[TS_PACKET_SIZE];
1485 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
1486 const int find_next= 1;
1487 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
1488 if (find_next) {
1489 for(;;) {
1490 url_fseek(s->pb, pos, SEEK_SET);
1491 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1492 return AV_NOPTS_VALUE;
1493 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1494 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1495 break;
1496 }
1497 pos += ts->raw_packet_size;
1498 }
1499 } else {
1500 for(;;) {
1501 pos -= ts->raw_packet_size;
1502 if (pos < 0)
1503 return AV_NOPTS_VALUE;
1504 url_fseek(s->pb, pos, SEEK_SET);
1505 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1506 return AV_NOPTS_VALUE;
1507 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
1508 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
1509 break;
1510 }
1511 }
1512 }
1513 *ppos = pos;
1514
1515 return timestamp;
1516 }
1517
1518 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
1519 MpegTSContext *ts = s->priv_data;
1520 uint8_t buf[TS_PACKET_SIZE];
1521 int64_t pos;
1522
1523 if(av_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
1524 return -1;
1525
1526 pos= url_ftell(s->pb);
1527
1528 for(;;) {
1529 url_fseek(s->pb, pos, SEEK_SET);
1530 if (get_buffer(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
1531 return -1;
1532 // pid = AV_RB16(buf + 1) & 0x1fff;
1533 if(buf[1] & 0x40) break;
1534 pos += ts->raw_packet_size;
1535 }
1536 url_fseek(s->pb, pos, SEEK_SET);
1537
1538 return 0;
1539 }
1540
1541 /**************************************************************/
1542 /* parsing functions - called from other demuxers such as RTP */
1543
1544 MpegTSContext *mpegts_parse_open(AVFormatContext *s)
1545 {
1546 MpegTSContext *ts;
1547
1548 ts = av_mallocz(sizeof(MpegTSContext));
1549 if (!ts)
1550 return NULL;
1551 /* no stream case, currently used by RTP */
1552 ts->raw_packet_size = TS_PACKET_SIZE;
1553 ts->stream = s;
1554 ts->auto_guess = 1;
1555 return ts;
1556 }
1557
1558 /* return the consumed length if a packet was output, or -1 if no
1559 packet is output */
1560 int mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
1561 const uint8_t *buf, int len)
1562 {
1563 int len1;
1564
1565 len1 = len;
1566 ts->pkt = pkt;
1567 ts->stop_parse = 0;
1568 for(;;) {
1569 if (ts->stop_parse>0)
1570 break;
1571 if (len < TS_PACKET_SIZE)
1572 return -1;
1573 if (buf[0] != 0x47) {
1574 buf++;
1575 len--;
1576 } else {
1577 handle_packet(ts, buf);
1578 buf += TS_PACKET_SIZE;
1579 len -= TS_PACKET_SIZE;
1580 }
1581 }
1582 return len1 - len;
1583 }
1584
1585 void mpegts_parse_close(MpegTSContext *ts)
1586 {
1587 int i;
1588
1589 for(i=0;i<NB_PID_MAX;i++)
1590 av_free(ts->pids[i]);
1591 av_free(ts);
1592 }
1593
1594 AVInputFormat mpegts_demuxer = {
1595 "mpegts",
1596 NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
1597 sizeof(MpegTSContext),
1598 mpegts_probe,
1599 mpegts_read_header,
1600 mpegts_read_packet,
1601 mpegts_read_close,
1602 read_seek,
1603 mpegts_get_pcr,
1604 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1605 };
1606
1607 AVInputFormat mpegtsraw_demuxer = {
1608 "mpegtsraw",
1609 NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
1610 sizeof(MpegTSContext),
1611 NULL,
1612 mpegts_read_header,
1613 mpegts_raw_read_packet,
1614 mpegts_read_close,
1615 read_seek,
1616 mpegts_get_pcr,
1617 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
1618 };
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