mpegts: replace some magic numbers with the existing define
[libav.git] / libavformat / mpegts.c
1 /*
2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 //#define USE_SYNCPOINT_SEARCH
23
24 #include "libavutil/crc.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/mathematics.h"
29 #include "libavutil/opt.h"
30 #include "libavcodec/bytestream.h"
31 #include "libavcodec/get_bits.h"
32 #include "avformat.h"
33 #include "mpegts.h"
34 #include "internal.h"
35 #include "avio_internal.h"
36 #include "seek.h"
37 #include "mpeg.h"
38 #include "isom.h"
39
40 /* maximum size in which we look for synchronisation if
41 synchronisation is lost */
42 #define MAX_RESYNC_SIZE 65536
43
44 #define MAX_PES_PAYLOAD 200*1024
45
46 #define MAX_MP4_DESCR_COUNT 16
47
48 enum MpegTSFilterType {
49 MPEGTS_PES,
50 MPEGTS_SECTION,
51 };
52
53 typedef struct MpegTSFilter MpegTSFilter;
54
55 typedef int PESCallback(MpegTSFilter *f, const uint8_t *buf, int len, int is_start, int64_t pos);
56
57 typedef struct MpegTSPESFilter {
58 PESCallback *pes_cb;
59 void *opaque;
60 } MpegTSPESFilter;
61
62 typedef void SectionCallback(MpegTSFilter *f, const uint8_t *buf, int len);
63
64 typedef void SetServiceCallback(void *opaque, int ret);
65
66 typedef struct MpegTSSectionFilter {
67 int section_index;
68 int section_h_size;
69 uint8_t *section_buf;
70 unsigned int check_crc:1;
71 unsigned int end_of_section_reached:1;
72 SectionCallback *section_cb;
73 void *opaque;
74 } MpegTSSectionFilter;
75
76 struct MpegTSFilter {
77 int pid;
78 int es_id;
79 int last_cc; /* last cc code (-1 if first packet) */
80 enum MpegTSFilterType type;
81 union {
82 MpegTSPESFilter pes_filter;
83 MpegTSSectionFilter section_filter;
84 } u;
85 };
86
87 #define MAX_PIDS_PER_PROGRAM 64
88 struct Program {
89 unsigned int id; //program id/service id
90 unsigned int nb_pids;
91 unsigned int pids[MAX_PIDS_PER_PROGRAM];
92 };
93
94 struct MpegTSContext {
95 const AVClass *class;
96 /* user data */
97 AVFormatContext *stream;
98 /** raw packet size, including FEC if present */
99 int raw_packet_size;
100
101 int pos47;
102
103 /** if true, all pids are analyzed to find streams */
104 int auto_guess;
105
106 /** compute exact PCR for each transport stream packet */
107 int mpeg2ts_compute_pcr;
108
109 int64_t cur_pcr; /**< used to estimate the exact PCR */
110 int pcr_incr; /**< used to estimate the exact PCR */
111
112 /* data needed to handle file based ts */
113 /** stop parsing loop */
114 int stop_parse;
115 /** packet containing Audio/Video data */
116 AVPacket *pkt;
117 /** to detect seek */
118 int64_t last_pos;
119
120 /******************************************/
121 /* private mpegts data */
122 /* scan context */
123 /** structure to keep track of Program->pids mapping */
124 unsigned int nb_prg;
125 struct Program *prg;
126
127
128 /** filters for various streams specified by PMT + for the PAT and PMT */
129 MpegTSFilter *pids[NB_PID_MAX];
130 };
131
132 static const AVOption options[] = {
133 {"compute_pcr", "Compute exact PCR for each transport stream packet.", offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
134 {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
135 { NULL },
136 };
137
138 static const AVClass mpegtsraw_class = {
139 .class_name = "mpegtsraw demuxer",
140 .item_name = av_default_item_name,
141 .option = options,
142 .version = LIBAVUTIL_VERSION_INT,
143 };
144
145 /* TS stream handling */
146
147 enum MpegTSState {
148 MPEGTS_HEADER = 0,
149 MPEGTS_PESHEADER,
150 MPEGTS_PESHEADER_FILL,
151 MPEGTS_PAYLOAD,
152 MPEGTS_SKIP,
153 };
154
155 /* enough for PES header + length */
156 #define PES_START_SIZE 6
157 #define PES_HEADER_SIZE 9
158 #define MAX_PES_HEADER_SIZE (9 + 255)
159
160 typedef struct PESContext {
161 int pid;
162 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
163 int stream_type;
164 MpegTSContext *ts;
165 AVFormatContext *stream;
166 AVStream *st;
167 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
168 enum MpegTSState state;
169 /* used to get the format */
170 int data_index;
171 int flags; /**< copied to the AVPacket flags */
172 int total_size;
173 int pes_header_size;
174 int extended_stream_id;
175 int64_t pts, dts;
176 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
177 uint8_t header[MAX_PES_HEADER_SIZE];
178 uint8_t *buffer;
179 SLConfigDescr sl;
180 } PESContext;
181
182 extern AVInputFormat ff_mpegts_demuxer;
183
184 static void clear_program(MpegTSContext *ts, unsigned int programid)
185 {
186 int i;
187
188 for(i=0; i<ts->nb_prg; i++)
189 if(ts->prg[i].id == programid)
190 ts->prg[i].nb_pids = 0;
191 }
192
193 static void clear_programs(MpegTSContext *ts)
194 {
195 av_freep(&ts->prg);
196 ts->nb_prg=0;
197 }
198
199 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
200 {
201 struct Program *p;
202 void *tmp = av_realloc(ts->prg, (ts->nb_prg+1)*sizeof(struct Program));
203 if(!tmp)
204 return;
205 ts->prg = tmp;
206 p = &ts->prg[ts->nb_prg];
207 p->id = programid;
208 p->nb_pids = 0;
209 ts->nb_prg++;
210 }
211
212 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, unsigned int pid)
213 {
214 int i;
215 struct Program *p = NULL;
216 for(i=0; i<ts->nb_prg; i++) {
217 if(ts->prg[i].id == programid) {
218 p = &ts->prg[i];
219 break;
220 }
221 }
222 if(!p)
223 return;
224
225 if(p->nb_pids >= MAX_PIDS_PER_PROGRAM)
226 return;
227 p->pids[p->nb_pids++] = pid;
228 }
229
230 /**
231 * @brief discard_pid() decides if the pid is to be discarded according
232 * to caller's programs selection
233 * @param ts : - TS context
234 * @param pid : - pid
235 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
236 * 0 otherwise
237 */
238 static int discard_pid(MpegTSContext *ts, unsigned int pid)
239 {
240 int i, j, k;
241 int used = 0, discarded = 0;
242 struct Program *p;
243 for(i=0; i<ts->nb_prg; i++) {
244 p = &ts->prg[i];
245 for(j=0; j<p->nb_pids; j++) {
246 if(p->pids[j] != pid)
247 continue;
248 //is program with id p->id set to be discarded?
249 for(k=0; k<ts->stream->nb_programs; k++) {
250 if(ts->stream->programs[k]->id == p->id) {
251 if(ts->stream->programs[k]->discard == AVDISCARD_ALL)
252 discarded++;
253 else
254 used++;
255 }
256 }
257 }
258 }
259
260 return !used && discarded;
261 }
262
263 /**
264 * Assemble PES packets out of TS packets, and then call the "section_cb"
265 * function when they are complete.
266 */
267 static void write_section_data(AVFormatContext *s, MpegTSFilter *tss1,
268 const uint8_t *buf, int buf_size, int is_start)
269 {
270 MpegTSSectionFilter *tss = &tss1->u.section_filter;
271 int len;
272
273 if (is_start) {
274 memcpy(tss->section_buf, buf, buf_size);
275 tss->section_index = buf_size;
276 tss->section_h_size = -1;
277 tss->end_of_section_reached = 0;
278 } else {
279 if (tss->end_of_section_reached)
280 return;
281 len = 4096 - tss->section_index;
282 if (buf_size < len)
283 len = buf_size;
284 memcpy(tss->section_buf + tss->section_index, buf, len);
285 tss->section_index += len;
286 }
287
288 /* compute section length if possible */
289 if (tss->section_h_size == -1 && tss->section_index >= 3) {
290 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
291 if (len > 4096)
292 return;
293 tss->section_h_size = len;
294 }
295
296 if (tss->section_h_size != -1 && tss->section_index >= tss->section_h_size) {
297 tss->end_of_section_reached = 1;
298 if (!tss->check_crc ||
299 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
300 tss->section_buf, tss->section_h_size) == 0)
301 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
302 }
303 }
304
305 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, unsigned int pid,
306 SectionCallback *section_cb, void *opaque,
307 int check_crc)
308
309 {
310 MpegTSFilter *filter;
311 MpegTSSectionFilter *sec;
312
313 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
314
315 if (pid >= NB_PID_MAX || ts->pids[pid])
316 return NULL;
317 filter = av_mallocz(sizeof(MpegTSFilter));
318 if (!filter)
319 return NULL;
320 ts->pids[pid] = filter;
321 filter->type = MPEGTS_SECTION;
322 filter->pid = pid;
323 filter->es_id = -1;
324 filter->last_cc = -1;
325 sec = &filter->u.section_filter;
326 sec->section_cb = section_cb;
327 sec->opaque = opaque;
328 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
329 sec->check_crc = check_crc;
330 if (!sec->section_buf) {
331 av_free(filter);
332 return NULL;
333 }
334 return filter;
335 }
336
337 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
338 PESCallback *pes_cb,
339 void *opaque)
340 {
341 MpegTSFilter *filter;
342 MpegTSPESFilter *pes;
343
344 if (pid >= NB_PID_MAX || ts->pids[pid])
345 return NULL;
346 filter = av_mallocz(sizeof(MpegTSFilter));
347 if (!filter)
348 return NULL;
349 ts->pids[pid] = filter;
350 filter->type = MPEGTS_PES;
351 filter->pid = pid;
352 filter->es_id = -1;
353 filter->last_cc = -1;
354 pes = &filter->u.pes_filter;
355 pes->pes_cb = pes_cb;
356 pes->opaque = opaque;
357 return filter;
358 }
359
360 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
361 {
362 int pid;
363
364 pid = filter->pid;
365 if (filter->type == MPEGTS_SECTION)
366 av_freep(&filter->u.section_filter.section_buf);
367 else if (filter->type == MPEGTS_PES) {
368 PESContext *pes = filter->u.pes_filter.opaque;
369 av_freep(&pes->buffer);
370 /* referenced private data will be freed later in
371 * avformat_close_input */
372 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
373 av_freep(&filter->u.pes_filter.opaque);
374 }
375 }
376
377 av_free(filter);
378 ts->pids[pid] = NULL;
379 }
380
381 static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
382 int stat[TS_MAX_PACKET_SIZE];
383 int i;
384 int x=0;
385 int best_score=0;
386
387 memset(stat, 0, packet_size*sizeof(int));
388
389 for(x=i=0; i<size-3; i++){
390 if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
391 stat[x]++;
392 if(stat[x] > best_score){
393 best_score= stat[x];
394 if(index) *index= x;
395 }
396 }
397
398 x++;
399 if(x == packet_size) x= 0;
400 }
401
402 return best_score;
403 }
404
405 /* autodetect fec presence. Must have at least 1024 bytes */
406 static int get_packet_size(const uint8_t *buf, int size)
407 {
408 int score, fec_score, dvhs_score;
409
410 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
411 return -1;
412
413 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
414 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
415 fec_score= analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
416 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
417
418 if (score > fec_score && score > dvhs_score) return TS_PACKET_SIZE;
419 else if(dvhs_score > score && dvhs_score > fec_score) return TS_DVHS_PACKET_SIZE;
420 else if(score < fec_score && dvhs_score < fec_score) return TS_FEC_PACKET_SIZE;
421 else return -1;
422 }
423
424 typedef struct SectionHeader {
425 uint8_t tid;
426 uint16_t id;
427 uint8_t version;
428 uint8_t sec_num;
429 uint8_t last_sec_num;
430 } SectionHeader;
431
432 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
433 {
434 const uint8_t *p;
435 int c;
436
437 p = *pp;
438 if (p >= p_end)
439 return -1;
440 c = *p++;
441 *pp = p;
442 return c;
443 }
444
445 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
446 {
447 const uint8_t *p;
448 int c;
449
450 p = *pp;
451 if ((p + 1) >= p_end)
452 return -1;
453 c = AV_RB16(p);
454 p += 2;
455 *pp = p;
456 return c;
457 }
458
459 /* read and allocate a DVB string preceded by its length */
460 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
461 {
462 int len;
463 const uint8_t *p;
464 char *str;
465
466 p = *pp;
467 len = get8(&p, p_end);
468 if (len < 0)
469 return NULL;
470 if ((p + len) > p_end)
471 return NULL;
472 str = av_malloc(len + 1);
473 if (!str)
474 return NULL;
475 memcpy(str, p, len);
476 str[len] = '\0';
477 p += len;
478 *pp = p;
479 return str;
480 }
481
482 static int parse_section_header(SectionHeader *h,
483 const uint8_t **pp, const uint8_t *p_end)
484 {
485 int val;
486
487 val = get8(pp, p_end);
488 if (val < 0)
489 return -1;
490 h->tid = val;
491 *pp += 2;
492 val = get16(pp, p_end);
493 if (val < 0)
494 return -1;
495 h->id = val;
496 val = get8(pp, p_end);
497 if (val < 0)
498 return -1;
499 h->version = (val >> 1) & 0x1f;
500 val = get8(pp, p_end);
501 if (val < 0)
502 return -1;
503 h->sec_num = val;
504 val = get8(pp, p_end);
505 if (val < 0)
506 return -1;
507 h->last_sec_num = val;
508 return 0;
509 }
510
511 typedef struct {
512 uint32_t stream_type;
513 enum AVMediaType codec_type;
514 enum CodecID codec_id;
515 } StreamType;
516
517 static const StreamType ISO_types[] = {
518 { 0x01, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
519 { 0x02, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO },
520 { 0x03, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
521 { 0x04, AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3 },
522 { 0x0f, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC },
523 { 0x10, AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG4 },
524 { 0x11, AVMEDIA_TYPE_AUDIO, CODEC_ID_AAC_LATM }, /* LATM syntax */
525 { 0x1b, AVMEDIA_TYPE_VIDEO, CODEC_ID_H264 },
526 { 0xd1, AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
527 { 0xea, AVMEDIA_TYPE_VIDEO, CODEC_ID_VC1 },
528 { 0 },
529 };
530
531 static const StreamType HDMV_types[] = {
532 { 0x80, AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_BLURAY },
533 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
534 { 0x82, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
535 { 0x83, AVMEDIA_TYPE_AUDIO, CODEC_ID_TRUEHD },
536 { 0x84, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 },
537 { 0x90, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_HDMV_PGS_SUBTITLE },
538 { 0 },
539 };
540
541 /* ATSC ? */
542 static const StreamType MISC_types[] = {
543 { 0x81, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
544 { 0x8a, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
545 { 0 },
546 };
547
548 static const StreamType REGD_types[] = {
549 { MKTAG('d','r','a','c'), AVMEDIA_TYPE_VIDEO, CODEC_ID_DIRAC },
550 { MKTAG('A','C','-','3'), AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 },
551 { MKTAG('B','S','S','D'), AVMEDIA_TYPE_AUDIO, CODEC_ID_S302M },
552 { 0 },
553 };
554
555 /* descriptor present */
556 static const StreamType DESC_types[] = {
557 { 0x6a, AVMEDIA_TYPE_AUDIO, CODEC_ID_AC3 }, /* AC-3 descriptor */
558 { 0x7a, AVMEDIA_TYPE_AUDIO, CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
559 { 0x7b, AVMEDIA_TYPE_AUDIO, CODEC_ID_DTS },
560 { 0x56, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_TELETEXT },
561 { 0x59, AVMEDIA_TYPE_SUBTITLE, CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
562 { 0 },
563 };
564
565 static void mpegts_find_stream_type(AVStream *st,
566 uint32_t stream_type, const StreamType *types)
567 {
568 for (; types->stream_type; types++) {
569 if (stream_type == types->stream_type) {
570 st->codec->codec_type = types->codec_type;
571 st->codec->codec_id = types->codec_id;
572 return;
573 }
574 }
575 }
576
577 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
578 uint32_t stream_type, uint32_t prog_reg_desc)
579 {
580 avpriv_set_pts_info(st, 33, 1, 90000);
581 st->priv_data = pes;
582 st->codec->codec_type = AVMEDIA_TYPE_DATA;
583 st->codec->codec_id = CODEC_ID_NONE;
584 st->need_parsing = AVSTREAM_PARSE_FULL;
585 pes->st = st;
586 pes->stream_type = stream_type;
587
588 av_log(pes->stream, AV_LOG_DEBUG,
589 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
590 st->index, pes->stream_type, pes->pid, (char*)&prog_reg_desc);
591
592 st->codec->codec_tag = pes->stream_type;
593
594 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
595 if (prog_reg_desc == AV_RL32("HDMV") &&
596 st->codec->codec_id == CODEC_ID_NONE) {
597 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
598 if (pes->stream_type == 0x83) {
599 // HDMV TrueHD streams also contain an AC3 coded version of the
600 // audio track - add a second stream for this
601 AVStream *sub_st;
602 // priv_data cannot be shared between streams
603 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
604 if (!sub_pes)
605 return AVERROR(ENOMEM);
606 memcpy(sub_pes, pes, sizeof(*sub_pes));
607
608 sub_st = avformat_new_stream(pes->stream, NULL);
609 if (!sub_st) {
610 av_free(sub_pes);
611 return AVERROR(ENOMEM);
612 }
613
614 sub_st->id = pes->pid;
615 avpriv_set_pts_info(sub_st, 33, 1, 90000);
616 sub_st->priv_data = sub_pes;
617 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
618 sub_st->codec->codec_id = CODEC_ID_AC3;
619 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
620 sub_pes->sub_st = pes->sub_st = sub_st;
621 }
622 }
623 if (st->codec->codec_id == CODEC_ID_NONE)
624 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
625
626 return 0;
627 }
628
629 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
630 {
631 av_init_packet(pkt);
632
633 pkt->destruct = av_destruct_packet;
634 pkt->data = pes->buffer;
635 pkt->size = pes->data_index;
636
637 if(pes->total_size != MAX_PES_PAYLOAD &&
638 pes->pes_header_size + pes->data_index != pes->total_size + PES_START_SIZE) {
639 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
640 pes->flags |= AV_PKT_FLAG_CORRUPT;
641 }
642 memset(pkt->data+pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
643
644 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
645 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
646 pkt->stream_index = pes->sub_st->index;
647 else
648 pkt->stream_index = pes->st->index;
649 pkt->pts = pes->pts;
650 pkt->dts = pes->dts;
651 /* store position of first TS packet of this PES packet */
652 pkt->pos = pes->ts_packet_pos;
653 pkt->flags = pes->flags;
654
655 /* reset pts values */
656 pes->pts = AV_NOPTS_VALUE;
657 pes->dts = AV_NOPTS_VALUE;
658 pes->buffer = NULL;
659 pes->data_index = 0;
660 pes->flags = 0;
661 }
662
663 static uint64_t get_bits64(GetBitContext *gb, int bits)
664 {
665 uint64_t ret = 0;
666 while (bits > 17) {
667 ret <<= 17;
668 ret |= get_bits(gb, 17);
669 bits -= 17;
670 }
671 ret <<= bits;
672 ret |= get_bits(gb, bits);
673 return ret;
674 }
675
676 static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
677 {
678 GetBitContext gb;
679 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
680 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
681 int dts_flag = -1, cts_flag = -1;
682 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
683 init_get_bits(&gb, buf, buf_size*8);
684
685 if (sl->use_au_start)
686 au_start_flag = get_bits1(&gb);
687 if (sl->use_au_end)
688 au_end_flag = get_bits1(&gb);
689 if (!sl->use_au_start && !sl->use_au_end)
690 au_start_flag = au_end_flag = 1;
691 if (sl->ocr_len > 0)
692 ocr_flag = get_bits1(&gb);
693 if (sl->use_idle)
694 idle_flag = get_bits1(&gb);
695 if (sl->use_padding)
696 padding_flag = get_bits1(&gb);
697 if (padding_flag)
698 padding_bits = get_bits(&gb, 3);
699
700 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
701 if (sl->packet_seq_num_len)
702 skip_bits_long(&gb, sl->packet_seq_num_len);
703 if (sl->degr_prior_len)
704 if (get_bits1(&gb))
705 skip_bits(&gb, sl->degr_prior_len);
706 if (ocr_flag)
707 skip_bits_long(&gb, sl->ocr_len);
708 if (au_start_flag) {
709 if (sl->use_rand_acc_pt)
710 get_bits1(&gb);
711 if (sl->au_seq_num_len > 0)
712 skip_bits_long(&gb, sl->au_seq_num_len);
713 if (sl->use_timestamps) {
714 dts_flag = get_bits1(&gb);
715 cts_flag = get_bits1(&gb);
716 }
717 }
718 if (sl->inst_bitrate_len)
719 inst_bitrate_flag = get_bits1(&gb);
720 if (dts_flag == 1)
721 dts = get_bits64(&gb, sl->timestamp_len);
722 if (cts_flag == 1)
723 cts = get_bits64(&gb, sl->timestamp_len);
724 if (sl->au_len > 0)
725 skip_bits_long(&gb, sl->au_len);
726 if (inst_bitrate_flag)
727 skip_bits_long(&gb, sl->inst_bitrate_len);
728 }
729
730 if (dts != AV_NOPTS_VALUE)
731 pes->dts = dts;
732 if (cts != AV_NOPTS_VALUE)
733 pes->pts = cts;
734
735 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
736
737 return (get_bits_count(&gb) + 7) >> 3;
738 }
739
740 /* return non zero if a packet could be constructed */
741 static int mpegts_push_data(MpegTSFilter *filter,
742 const uint8_t *buf, int buf_size, int is_start,
743 int64_t pos)
744 {
745 PESContext *pes = filter->u.pes_filter.opaque;
746 MpegTSContext *ts = pes->ts;
747 const uint8_t *p;
748 int len, code;
749
750 if(!ts->pkt)
751 return 0;
752
753 if (is_start) {
754 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
755 new_pes_packet(pes, ts->pkt);
756 ts->stop_parse = 1;
757 }
758 pes->state = MPEGTS_HEADER;
759 pes->data_index = 0;
760 pes->ts_packet_pos = pos;
761 }
762 p = buf;
763 while (buf_size > 0) {
764 switch(pes->state) {
765 case MPEGTS_HEADER:
766 len = PES_START_SIZE - pes->data_index;
767 if (len > buf_size)
768 len = buf_size;
769 memcpy(pes->header + pes->data_index, p, len);
770 pes->data_index += len;
771 p += len;
772 buf_size -= len;
773 if (pes->data_index == PES_START_SIZE) {
774 /* we got all the PES or section header. We can now
775 decide */
776 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
777 pes->header[2] == 0x01) {
778 /* it must be an mpeg2 PES stream */
779 code = pes->header[3] | 0x100;
780 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, code);
781
782 if ((pes->st && pes->st->discard == AVDISCARD_ALL) ||
783 code == 0x1be) /* padding_stream */
784 goto skip;
785
786 /* stream not present in PMT */
787 if (!pes->st) {
788 pes->st = avformat_new_stream(ts->stream, NULL);
789 if (!pes->st)
790 return AVERROR(ENOMEM);
791 pes->st->id = pes->pid;
792 mpegts_set_stream_info(pes->st, pes, 0, 0);
793 }
794
795 pes->total_size = AV_RB16(pes->header + 4);
796 /* NOTE: a zero total size means the PES size is
797 unbounded */
798 if (!pes->total_size)
799 pes->total_size = MAX_PES_PAYLOAD;
800
801 /* allocate pes buffer */
802 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
803 if (!pes->buffer)
804 return AVERROR(ENOMEM);
805
806 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
807 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
808 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
809 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
810 pes->state = MPEGTS_PESHEADER;
811 if (pes->st->codec->codec_id == CODEC_ID_NONE) {
812 av_dlog(pes->stream, "pid=%x stream_type=%x probing\n",
813 pes->pid, pes->stream_type);
814 pes->st->codec->codec_id = CODEC_ID_PROBE;
815 }
816 } else {
817 pes->state = MPEGTS_PAYLOAD;
818 pes->data_index = 0;
819 }
820 } else {
821 /* otherwise, it should be a table */
822 /* skip packet */
823 skip:
824 pes->state = MPEGTS_SKIP;
825 continue;
826 }
827 }
828 break;
829 /**********************************************/
830 /* PES packing parsing */
831 case MPEGTS_PESHEADER:
832 len = PES_HEADER_SIZE - pes->data_index;
833 if (len < 0)
834 return -1;
835 if (len > buf_size)
836 len = buf_size;
837 memcpy(pes->header + pes->data_index, p, len);
838 pes->data_index += len;
839 p += len;
840 buf_size -= len;
841 if (pes->data_index == PES_HEADER_SIZE) {
842 pes->pes_header_size = pes->header[8] + 9;
843 pes->state = MPEGTS_PESHEADER_FILL;
844 }
845 break;
846 case MPEGTS_PESHEADER_FILL:
847 len = pes->pes_header_size - pes->data_index;
848 if (len < 0)
849 return -1;
850 if (len > buf_size)
851 len = buf_size;
852 memcpy(pes->header + pes->data_index, p, len);
853 pes->data_index += len;
854 p += len;
855 buf_size -= len;
856 if (pes->data_index == pes->pes_header_size) {
857 const uint8_t *r;
858 unsigned int flags, pes_ext, skip;
859
860 flags = pes->header[7];
861 r = pes->header + 9;
862 pes->pts = AV_NOPTS_VALUE;
863 pes->dts = AV_NOPTS_VALUE;
864 if ((flags & 0xc0) == 0x80) {
865 pes->dts = pes->pts = ff_parse_pes_pts(r);
866 r += 5;
867 } else if ((flags & 0xc0) == 0xc0) {
868 pes->pts = ff_parse_pes_pts(r);
869 r += 5;
870 pes->dts = ff_parse_pes_pts(r);
871 r += 5;
872 }
873 pes->extended_stream_id = -1;
874 if (flags & 0x01) { /* PES extension */
875 pes_ext = *r++;
876 /* Skip PES private data, program packet sequence counter and P-STD buffer */
877 skip = (pes_ext >> 4) & 0xb;
878 skip += skip & 0x9;
879 r += skip;
880 if ((pes_ext & 0x41) == 0x01 &&
881 (r + 2) <= (pes->header + pes->pes_header_size)) {
882 /* PES extension 2 */
883 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
884 pes->extended_stream_id = r[1];
885 }
886 }
887
888 /* we got the full header. We parse it and get the payload */
889 pes->state = MPEGTS_PAYLOAD;
890 pes->data_index = 0;
891 if (pes->stream_type == 0x12) {
892 int sl_header_bytes = read_sl_header(pes, &pes->sl, p, buf_size);
893 pes->pes_header_size += sl_header_bytes;
894 p += sl_header_bytes;
895 buf_size -= sl_header_bytes;
896 }
897 }
898 break;
899 case MPEGTS_PAYLOAD:
900 if (buf_size > 0 && pes->buffer) {
901 if (pes->data_index > 0 && pes->data_index+buf_size > pes->total_size) {
902 new_pes_packet(pes, ts->pkt);
903 pes->total_size = MAX_PES_PAYLOAD;
904 pes->buffer = av_malloc(pes->total_size+FF_INPUT_BUFFER_PADDING_SIZE);
905 if (!pes->buffer)
906 return AVERROR(ENOMEM);
907 ts->stop_parse = 1;
908 } else if (pes->data_index == 0 && buf_size > pes->total_size) {
909 // pes packet size is < ts size packet and pes data is padded with 0xff
910 // not sure if this is legal in ts but see issue #2392
911 buf_size = pes->total_size;
912 }
913 memcpy(pes->buffer+pes->data_index, p, buf_size);
914 pes->data_index += buf_size;
915 }
916 buf_size = 0;
917 /* emit complete packets with known packet size
918 * decreases demuxer delay for infrequent packets like subtitles from
919 * a couple of seconds to milliseconds for properly muxed files.
920 * total_size is the number of bytes following pes_packet_length
921 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
922 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
923 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
924 ts->stop_parse = 1;
925 new_pes_packet(pes, ts->pkt);
926 }
927 break;
928 case MPEGTS_SKIP:
929 buf_size = 0;
930 break;
931 }
932 }
933
934 return 0;
935 }
936
937 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
938 {
939 MpegTSFilter *tss;
940 PESContext *pes;
941
942 /* if no pid found, then add a pid context */
943 pes = av_mallocz(sizeof(PESContext));
944 if (!pes)
945 return 0;
946 pes->ts = ts;
947 pes->stream = ts->stream;
948 pes->pid = pid;
949 pes->pcr_pid = pcr_pid;
950 pes->state = MPEGTS_SKIP;
951 pes->pts = AV_NOPTS_VALUE;
952 pes->dts = AV_NOPTS_VALUE;
953 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
954 if (!tss) {
955 av_free(pes);
956 return 0;
957 }
958 return pes;
959 }
960
961 #define MAX_LEVEL 4
962 typedef struct {
963 AVFormatContext *s;
964 AVIOContext pb;
965 Mp4Descr *descr;
966 Mp4Descr *active_descr;
967 int descr_count;
968 int max_descr_count;
969 int level;
970 } MP4DescrParseContext;
971
972 static int init_MP4DescrParseContext(
973 MP4DescrParseContext *d, AVFormatContext *s, const uint8_t *buf,
974 unsigned size, Mp4Descr *descr, int max_descr_count)
975 {
976 int ret;
977 if (size > (1<<30))
978 return AVERROR_INVALIDDATA;
979
980 if ((ret = ffio_init_context(&d->pb, (unsigned char*)buf, size, 0,
981 NULL, NULL, NULL, NULL)) < 0)
982 return ret;
983
984 d->s = s;
985 d->level = 0;
986 d->descr_count = 0;
987 d->descr = descr;
988 d->active_descr = NULL;
989 d->max_descr_count = max_descr_count;
990
991 return 0;
992 }
993
994 static void update_offsets(AVIOContext *pb, int64_t *off, int *len) {
995 int64_t new_off = avio_tell(pb);
996 (*len) -= new_off - *off;
997 *off = new_off;
998 }
999
1000 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1001 int target_tag);
1002
1003 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1004 {
1005 while (len > 0) {
1006 if (parse_mp4_descr(d, off, len, 0) < 0)
1007 return -1;
1008 update_offsets(&d->pb, &off, &len);
1009 }
1010 return 0;
1011 }
1012
1013 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1014 {
1015 avio_rb16(&d->pb); // ID
1016 avio_r8(&d->pb);
1017 avio_r8(&d->pb);
1018 avio_r8(&d->pb);
1019 avio_r8(&d->pb);
1020 avio_r8(&d->pb);
1021 update_offsets(&d->pb, &off, &len);
1022 return parse_mp4_descr_arr(d, off, len);
1023 }
1024
1025 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1026 {
1027 int id_flags;
1028 if (len < 2)
1029 return 0;
1030 id_flags = avio_rb16(&d->pb);
1031 if (!(id_flags & 0x0020)) { //URL_Flag
1032 update_offsets(&d->pb, &off, &len);
1033 return parse_mp4_descr_arr(d, off, len); //ES_Descriptor[]
1034 } else {
1035 return 0;
1036 }
1037 }
1038
1039 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1040 {
1041 int es_id = 0;
1042 if (d->descr_count >= d->max_descr_count)
1043 return -1;
1044 ff_mp4_parse_es_descr(&d->pb, &es_id);
1045 d->active_descr = d->descr + (d->descr_count++);
1046
1047 d->active_descr->es_id = es_id;
1048 update_offsets(&d->pb, &off, &len);
1049 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1050 update_offsets(&d->pb, &off, &len);
1051 if (len > 0)
1052 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1053 d->active_descr = NULL;
1054 return 0;
1055 }
1056
1057 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1058 {
1059 Mp4Descr *descr = d->active_descr;
1060 if (!descr)
1061 return -1;
1062 d->active_descr->dec_config_descr = av_malloc(len);
1063 if (!descr->dec_config_descr)
1064 return AVERROR(ENOMEM);
1065 descr->dec_config_descr_len = len;
1066 avio_read(&d->pb, descr->dec_config_descr, len);
1067 return 0;
1068 }
1069
1070 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1071 {
1072 Mp4Descr *descr = d->active_descr;
1073 int predefined;
1074 if (!descr)
1075 return -1;
1076
1077 predefined = avio_r8(&d->pb);
1078 if (!predefined) {
1079 int lengths;
1080 int flags = avio_r8(&d->pb);
1081 descr->sl.use_au_start = !!(flags & 0x80);
1082 descr->sl.use_au_end = !!(flags & 0x40);
1083 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1084 descr->sl.use_padding = !!(flags & 0x08);
1085 descr->sl.use_timestamps = !!(flags & 0x04);
1086 descr->sl.use_idle = !!(flags & 0x02);
1087 descr->sl.timestamp_res = avio_rb32(&d->pb);
1088 avio_rb32(&d->pb);
1089 descr->sl.timestamp_len = avio_r8(&d->pb);
1090 descr->sl.ocr_len = avio_r8(&d->pb);
1091 descr->sl.au_len = avio_r8(&d->pb);
1092 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1093 lengths = avio_rb16(&d->pb);
1094 descr->sl.degr_prior_len = lengths >> 12;
1095 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1096 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1097 } else {
1098 av_log_missing_feature(d->s, "Predefined SLConfigDescriptor\n", 0);
1099 }
1100 return 0;
1101 }
1102
1103 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1104 int target_tag) {
1105 int tag;
1106 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1107 update_offsets(&d->pb, &off, &len);
1108 if (len < 0 || len1 > len || len1 <= 0) {
1109 av_log(d->s, AV_LOG_ERROR, "Tag %x length violation new length %d bytes remaining %d\n", tag, len1, len);
1110 return -1;
1111 }
1112
1113 if (d->level++ >= MAX_LEVEL) {
1114 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1115 goto done;
1116 }
1117
1118 if (target_tag && tag != target_tag) {
1119 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, target_tag);
1120 goto done;
1121 }
1122
1123 switch (tag) {
1124 case MP4IODescrTag:
1125 parse_MP4IODescrTag(d, off, len1);
1126 break;
1127 case MP4ODescrTag:
1128 parse_MP4ODescrTag(d, off, len1);
1129 break;
1130 case MP4ESDescrTag:
1131 parse_MP4ESDescrTag(d, off, len1);
1132 break;
1133 case MP4DecConfigDescrTag:
1134 parse_MP4DecConfigDescrTag(d, off, len1);
1135 break;
1136 case MP4SLDescrTag:
1137 parse_MP4SLDescrTag(d, off, len1);
1138 break;
1139 }
1140
1141 done:
1142 d->level--;
1143 avio_seek(&d->pb, off + len1, SEEK_SET);
1144 return 0;
1145 }
1146
1147 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1148 Mp4Descr *descr, int *descr_count, int max_descr_count)
1149 {
1150 MP4DescrParseContext d;
1151 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1152 return -1;
1153
1154 parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1155
1156 *descr_count = d.descr_count;
1157 return 0;
1158 }
1159
1160 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1161 Mp4Descr *descr, int *descr_count, int max_descr_count)
1162 {
1163 MP4DescrParseContext d;
1164 if (init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count) < 0)
1165 return -1;
1166
1167 parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1168
1169 *descr_count = d.descr_count;
1170 return 0;
1171 }
1172
1173 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1174 {
1175 MpegTSContext *ts = filter->u.section_filter.opaque;
1176 SectionHeader h;
1177 const uint8_t *p, *p_end;
1178 AVIOContext pb;
1179 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1180 int mp4_descr_count = 0;
1181 int i, pid;
1182 AVFormatContext *s = ts->stream;
1183
1184 p_end = section + section_len - 4;
1185 p = section;
1186 if (parse_section_header(&h, &p, p_end) < 0)
1187 return;
1188 if (h.tid != M4OD_TID)
1189 return;
1190
1191 mp4_read_od(s, p, (unsigned)(p_end - p), mp4_descr, &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1192
1193 for (pid = 0; pid < NB_PID_MAX; pid++) {
1194 if (!ts->pids[pid])
1195 continue;
1196 for (i = 0; i < mp4_descr_count; i++) {
1197 PESContext *pes;
1198 AVStream *st;
1199 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1200 continue;
1201 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1202 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1203 continue;
1204 }
1205 pes = ts->pids[pid]->u.pes_filter.opaque;
1206 st = pes->st;
1207 if (!st) {
1208 continue;
1209 }
1210
1211 pes->sl = mp4_descr[i].sl;
1212
1213 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1214 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1215 ff_mp4_read_dec_config_descr(s, st, &pb);
1216 if (st->codec->codec_id == CODEC_ID_AAC &&
1217 st->codec->extradata_size > 0)
1218 st->need_parsing = 0;
1219 if (st->codec->codec_id == CODEC_ID_H264 &&
1220 st->codec->extradata_size > 0)
1221 st->need_parsing = 0;
1222
1223 if (st->codec->codec_id <= CODEC_ID_NONE) {
1224 } else if (st->codec->codec_id < CODEC_ID_FIRST_AUDIO) {
1225 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1226 } else if (st->codec->codec_id < CODEC_ID_FIRST_SUBTITLE) {
1227 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1228 } else if (st->codec->codec_id < CODEC_ID_FIRST_UNKNOWN) {
1229 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1230 }
1231 }
1232 }
1233 for (i = 0; i < mp4_descr_count; i++)
1234 av_free(mp4_descr[i].dec_config_descr);
1235 }
1236
1237 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1238 const uint8_t **pp, const uint8_t *desc_list_end,
1239 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1240 MpegTSContext *ts)
1241 {
1242 const uint8_t *desc_end;
1243 int desc_len, desc_tag, desc_es_id;
1244 char language[252];
1245 int i;
1246
1247 desc_tag = get8(pp, desc_list_end);
1248 if (desc_tag < 0)
1249 return -1;
1250 desc_len = get8(pp, desc_list_end);
1251 if (desc_len < 0)
1252 return -1;
1253 desc_end = *pp + desc_len;
1254 if (desc_end > desc_list_end)
1255 return -1;
1256
1257 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1258
1259 if (st->codec->codec_id == CODEC_ID_NONE &&
1260 stream_type == STREAM_TYPE_PRIVATE_DATA)
1261 mpegts_find_stream_type(st, desc_tag, DESC_types);
1262
1263 switch(desc_tag) {
1264 case 0x1E: /* SL descriptor */
1265 desc_es_id = get16(pp, desc_end);
1266 if (ts && ts->pids[pid])
1267 ts->pids[pid]->es_id = desc_es_id;
1268 for (i = 0; i < mp4_descr_count; i++)
1269 if (mp4_descr[i].dec_config_descr_len &&
1270 mp4_descr[i].es_id == desc_es_id) {
1271 AVIOContext pb;
1272 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1273 mp4_descr[i].dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1274 ff_mp4_read_dec_config_descr(fc, st, &pb);
1275 if (st->codec->codec_id == CODEC_ID_AAC &&
1276 st->codec->extradata_size > 0)
1277 st->need_parsing = 0;
1278 if (st->codec->codec_id == CODEC_ID_MPEG4SYSTEMS)
1279 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1280 }
1281 break;
1282 case 0x1F: /* FMC descriptor */
1283 get16(pp, desc_end);
1284 if (mp4_descr_count > 0 && st->codec->codec_id == CODEC_ID_AAC_LATM &&
1285 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1286 AVIOContext pb;
1287 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1288 mp4_descr->dec_config_descr_len, 0, NULL, NULL, NULL, NULL);
1289 ff_mp4_read_dec_config_descr(fc, st, &pb);
1290 if (st->codec->codec_id == CODEC_ID_AAC &&
1291 st->codec->extradata_size > 0)
1292 st->need_parsing = 0;
1293 }
1294 break;
1295 case 0x56: /* DVB teletext descriptor */
1296 language[0] = get8(pp, desc_end);
1297 language[1] = get8(pp, desc_end);
1298 language[2] = get8(pp, desc_end);
1299 language[3] = 0;
1300 av_dict_set(&st->metadata, "language", language, 0);
1301 break;
1302 case 0x59: /* subtitling descriptor */
1303 language[0] = get8(pp, desc_end);
1304 language[1] = get8(pp, desc_end);
1305 language[2] = get8(pp, desc_end);
1306 language[3] = 0;
1307 /* hearing impaired subtitles detection */
1308 switch(get8(pp, desc_end)) {
1309 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1310 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1311 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1312 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1313 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1314 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1315 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1316 break;
1317 }
1318 if (st->codec->extradata) {
1319 if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
1320 av_log_ask_for_sample(fc, "DVB sub with multiple IDs\n");
1321 } else {
1322 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1323 if (st->codec->extradata) {
1324 st->codec->extradata_size = 4;
1325 memcpy(st->codec->extradata, *pp, 4);
1326 }
1327 }
1328 *pp += 4;
1329 av_dict_set(&st->metadata, "language", language, 0);
1330 break;
1331 case 0x0a: /* ISO 639 language descriptor */
1332 for (i = 0; i + 4 <= desc_len; i += 4) {
1333 language[i + 0] = get8(pp, desc_end);
1334 language[i + 1] = get8(pp, desc_end);
1335 language[i + 2] = get8(pp, desc_end);
1336 language[i + 3] = ',';
1337 switch (get8(pp, desc_end)) {
1338 case 0x01: st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; break;
1339 case 0x02: st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; break;
1340 case 0x03: st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; break;
1341 }
1342 }
1343 if (i) {
1344 language[i - 1] = 0;
1345 av_dict_set(&st->metadata, "language", language, 0);
1346 }
1347 break;
1348 case 0x05: /* registration descriptor */
1349 st->codec->codec_tag = bytestream_get_le32(pp);
1350 av_dlog(fc, "reg_desc=%.4s\n", (char*)&st->codec->codec_tag);
1351 if (st->codec->codec_id == CODEC_ID_NONE &&
1352 stream_type == STREAM_TYPE_PRIVATE_DATA)
1353 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1354 break;
1355 default:
1356 break;
1357 }
1358 *pp = desc_end;
1359 return 0;
1360 }
1361
1362 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1363 {
1364 MpegTSContext *ts = filter->u.section_filter.opaque;
1365 SectionHeader h1, *h = &h1;
1366 PESContext *pes;
1367 AVStream *st;
1368 const uint8_t *p, *p_end, *desc_list_end;
1369 int program_info_length, pcr_pid, pid, stream_type;
1370 int desc_list_len;
1371 uint32_t prog_reg_desc = 0; /* registration descriptor */
1372
1373 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = {{ 0 }};
1374 int mp4_descr_count = 0;
1375 int i;
1376
1377 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1378 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1379
1380 p_end = section + section_len - 4;
1381 p = section;
1382 if (parse_section_header(h, &p, p_end) < 0)
1383 return;
1384
1385 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1386 h->id, h->sec_num, h->last_sec_num);
1387
1388 if (h->tid != PMT_TID)
1389 return;
1390
1391 clear_program(ts, h->id);
1392 pcr_pid = get16(&p, p_end) & 0x1fff;
1393 if (pcr_pid < 0)
1394 return;
1395 add_pid_to_pmt(ts, h->id, pcr_pid);
1396
1397 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1398
1399 program_info_length = get16(&p, p_end) & 0xfff;
1400 if (program_info_length < 0)
1401 return;
1402 while(program_info_length >= 2) {
1403 uint8_t tag, len;
1404 tag = get8(&p, p_end);
1405 len = get8(&p, p_end);
1406
1407 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1408
1409 if(len > program_info_length - 2)
1410 //something else is broken, exit the program_descriptors_loop
1411 break;
1412 program_info_length -= len + 2;
1413 if (tag == 0x1d) { // IOD descriptor
1414 get8(&p, p_end); // scope
1415 get8(&p, p_end); // label
1416 len -= 2;
1417 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1418 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1419 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1420 prog_reg_desc = bytestream_get_le32(&p);
1421 len -= 4;
1422 }
1423 p += len;
1424 }
1425 p += program_info_length;
1426 if (p >= p_end)
1427 goto out;
1428
1429 // stop parsing after pmt, we found header
1430 if (!ts->stream->nb_streams)
1431 ts->stop_parse = 1;
1432
1433 for(;;) {
1434 st = 0;
1435 pes = NULL;
1436 stream_type = get8(&p, p_end);
1437 if (stream_type < 0)
1438 break;
1439 pid = get16(&p, p_end) & 0x1fff;
1440 if (pid < 0)
1441 break;
1442
1443 /* now create stream */
1444 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1445 pes = ts->pids[pid]->u.pes_filter.opaque;
1446 if (!pes->st) {
1447 pes->st = avformat_new_stream(pes->stream, NULL);
1448 pes->st->id = pes->pid;
1449 }
1450 st = pes->st;
1451 } else if (stream_type != 0x13) {
1452 if (ts->pids[pid]) mpegts_close_filter(ts, ts->pids[pid]); //wrongly added sdt filter probably
1453 pes = add_pes_stream(ts, pid, pcr_pid);
1454 if (pes) {
1455 st = avformat_new_stream(pes->stream, NULL);
1456 st->id = pes->pid;
1457 }
1458 } else {
1459 int idx = ff_find_stream_index(ts->stream, pid);
1460 if (idx >= 0) {
1461 st = ts->stream->streams[idx];
1462 } else {
1463 st = avformat_new_stream(pes->stream, NULL);
1464 st->id = pid;
1465 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1466 }
1467 }
1468
1469 if (!st)
1470 goto out;
1471
1472 if (pes && !pes->stream_type)
1473 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1474
1475 add_pid_to_pmt(ts, h->id, pid);
1476
1477 ff_program_add_stream_index(ts->stream, h->id, st->index);
1478
1479 desc_list_len = get16(&p, p_end) & 0xfff;
1480 if (desc_list_len < 0)
1481 break;
1482 desc_list_end = p + desc_list_len;
1483 if (desc_list_end > p_end)
1484 break;
1485 for(;;) {
1486 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, desc_list_end,
1487 mp4_descr, mp4_descr_count, pid, ts) < 0)
1488 break;
1489
1490 if (pes && prog_reg_desc == AV_RL32("HDMV") && stream_type == 0x83 && pes->sub_st) {
1491 ff_program_add_stream_index(ts->stream, h->id, pes->sub_st->index);
1492 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1493 }
1494 }
1495 p = desc_list_end;
1496 }
1497
1498 out:
1499 for (i = 0; i < mp4_descr_count; i++)
1500 av_free(mp4_descr[i].dec_config_descr);
1501 }
1502
1503 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1504 {
1505 MpegTSContext *ts = filter->u.section_filter.opaque;
1506 SectionHeader h1, *h = &h1;
1507 const uint8_t *p, *p_end;
1508 int sid, pmt_pid;
1509
1510 av_dlog(ts->stream, "PAT:\n");
1511 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1512
1513 p_end = section + section_len - 4;
1514 p = section;
1515 if (parse_section_header(h, &p, p_end) < 0)
1516 return;
1517 if (h->tid != PAT_TID)
1518 return;
1519
1520 clear_programs(ts);
1521 for(;;) {
1522 sid = get16(&p, p_end);
1523 if (sid < 0)
1524 break;
1525 pmt_pid = get16(&p, p_end) & 0x1fff;
1526 if (pmt_pid < 0)
1527 break;
1528
1529 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1530
1531 if (sid == 0x0000) {
1532 /* NIT info */
1533 } else {
1534 av_new_program(ts->stream, sid);
1535 if (ts->pids[pmt_pid])
1536 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1537 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1538 add_pat_entry(ts, sid);
1539 add_pid_to_pmt(ts, sid, 0); //add pat pid to program
1540 add_pid_to_pmt(ts, sid, pmt_pid);
1541 }
1542 }
1543 }
1544
1545 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1546 {
1547 MpegTSContext *ts = filter->u.section_filter.opaque;
1548 SectionHeader h1, *h = &h1;
1549 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1550 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1551 char *name, *provider_name;
1552
1553 av_dlog(ts->stream, "SDT:\n");
1554 hex_dump_debug(ts->stream, (uint8_t *)section, section_len);
1555
1556 p_end = section + section_len - 4;
1557 p = section;
1558 if (parse_section_header(h, &p, p_end) < 0)
1559 return;
1560 if (h->tid != SDT_TID)
1561 return;
1562 onid = get16(&p, p_end);
1563 if (onid < 0)
1564 return;
1565 val = get8(&p, p_end);
1566 if (val < 0)
1567 return;
1568 for(;;) {
1569 sid = get16(&p, p_end);
1570 if (sid < 0)
1571 break;
1572 val = get8(&p, p_end);
1573 if (val < 0)
1574 break;
1575 desc_list_len = get16(&p, p_end) & 0xfff;
1576 if (desc_list_len < 0)
1577 break;
1578 desc_list_end = p + desc_list_len;
1579 if (desc_list_end > p_end)
1580 break;
1581 for(;;) {
1582 desc_tag = get8(&p, desc_list_end);
1583 if (desc_tag < 0)
1584 break;
1585 desc_len = get8(&p, desc_list_end);
1586 desc_end = p + desc_len;
1587 if (desc_end > desc_list_end)
1588 break;
1589
1590 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
1591 desc_tag, desc_len);
1592
1593 switch(desc_tag) {
1594 case 0x48:
1595 service_type = get8(&p, p_end);
1596 if (service_type < 0)
1597 break;
1598 provider_name = getstr8(&p, p_end);
1599 if (!provider_name)
1600 break;
1601 name = getstr8(&p, p_end);
1602 if (name) {
1603 AVProgram *program = av_new_program(ts->stream, sid);
1604 if(program) {
1605 av_dict_set(&program->metadata, "service_name", name, 0);
1606 av_dict_set(&program->metadata, "service_provider", provider_name, 0);
1607 }
1608 }
1609 av_free(name);
1610 av_free(provider_name);
1611 break;
1612 default:
1613 break;
1614 }
1615 p = desc_end;
1616 }
1617 p = desc_list_end;
1618 }
1619 }
1620
1621 /* handle one TS packet */
1622 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1623 {
1624 AVFormatContext *s = ts->stream;
1625 MpegTSFilter *tss;
1626 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1627 has_adaptation, has_payload;
1628 const uint8_t *p, *p_end;
1629 int64_t pos;
1630
1631 pid = AV_RB16(packet + 1) & 0x1fff;
1632 if(pid && discard_pid(ts, pid))
1633 return 0;
1634 is_start = packet[1] & 0x40;
1635 tss = ts->pids[pid];
1636 if (ts->auto_guess && tss == NULL && is_start) {
1637 add_pes_stream(ts, pid, -1);
1638 tss = ts->pids[pid];
1639 }
1640 if (!tss)
1641 return 0;
1642
1643 afc = (packet[3] >> 4) & 3;
1644 if (afc == 0) /* reserved value */
1645 return 0;
1646 has_adaptation = afc & 2;
1647 has_payload = afc & 1;
1648 is_discontinuity = has_adaptation
1649 && packet[4] != 0 /* with length > 0 */
1650 && (packet[5] & 0x80); /* and discontinuity indicated */
1651
1652 /* continuity check (currently not used) */
1653 cc = (packet[3] & 0xf);
1654 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1655 cc_ok = pid == 0x1FFF // null packet PID
1656 || is_discontinuity
1657 || tss->last_cc < 0
1658 || expected_cc == cc;
1659
1660 tss->last_cc = cc;
1661 if (!cc_ok) {
1662 av_log(ts->stream, AV_LOG_WARNING,
1663 "Continuity check failed for pid %d expected %d got %d\n",
1664 pid, expected_cc, cc);
1665 if(tss->type == MPEGTS_PES) {
1666 PESContext *pc = tss->u.pes_filter.opaque;
1667 pc->flags |= AV_PKT_FLAG_CORRUPT;
1668 }
1669 }
1670
1671 if (!has_payload)
1672 return 0;
1673 p = packet + 4;
1674 if (has_adaptation) {
1675 /* skip adaptation field */
1676 p += p[0] + 1;
1677 }
1678 /* if past the end of packet, ignore */
1679 p_end = packet + TS_PACKET_SIZE;
1680 if (p >= p_end)
1681 return 0;
1682
1683 pos = avio_tell(ts->stream->pb);
1684 ts->pos47= pos % ts->raw_packet_size;
1685
1686 if (tss->type == MPEGTS_SECTION) {
1687 if (is_start) {
1688 /* pointer field present */
1689 len = *p++;
1690 if (p + len > p_end)
1691 return 0;
1692 if (len && cc_ok) {
1693 /* write remaining section bytes */
1694 write_section_data(s, tss,
1695 p, len, 0);
1696 /* check whether filter has been closed */
1697 if (!ts->pids[pid])
1698 return 0;
1699 }
1700 p += len;
1701 if (p < p_end) {
1702 write_section_data(s, tss,
1703 p, p_end - p, 1);
1704 }
1705 } else {
1706 if (cc_ok) {
1707 write_section_data(s, tss,
1708 p, p_end - p, 0);
1709 }
1710 }
1711 } else {
1712 int ret;
1713 // Note: The position here points actually behind the current packet.
1714 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1715 pos - ts->raw_packet_size)) < 0)
1716 return ret;
1717 }
1718
1719 return 0;
1720 }
1721
1722 /* XXX: try to find a better synchro over several packets (use
1723 get_packet_size() ?) */
1724 static int mpegts_resync(AVFormatContext *s)
1725 {
1726 AVIOContext *pb = s->pb;
1727 int c, i;
1728
1729 for(i = 0;i < MAX_RESYNC_SIZE; i++) {
1730 c = avio_r8(pb);
1731 if (pb->eof_reached)
1732 return -1;
1733 if (c == 0x47) {
1734 avio_seek(pb, -1, SEEK_CUR);
1735 return 0;
1736 }
1737 }
1738 av_log(s, AV_LOG_ERROR, "max resync size reached, could not find sync byte\n");
1739 /* no sync found */
1740 return -1;
1741 }
1742
1743 /* return -1 if error or EOF. Return 0 if OK. */
1744 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size)
1745 {
1746 AVIOContext *pb = s->pb;
1747 int skip, len;
1748
1749 for(;;) {
1750 len = avio_read(pb, buf, TS_PACKET_SIZE);
1751 if (len != TS_PACKET_SIZE)
1752 return len < 0 ? len : AVERROR_EOF;
1753 /* check packet sync byte */
1754 if (buf[0] != 0x47) {
1755 /* find a new packet start */
1756 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1757 if (mpegts_resync(s) < 0)
1758 return AVERROR(EAGAIN);
1759 else
1760 continue;
1761 } else {
1762 skip = raw_packet_size - TS_PACKET_SIZE;
1763 if (skip > 0)
1764 avio_skip(pb, skip);
1765 break;
1766 }
1767 }
1768 return 0;
1769 }
1770
1771 static int handle_packets(MpegTSContext *ts, int nb_packets)
1772 {
1773 AVFormatContext *s = ts->stream;
1774 uint8_t packet[TS_PACKET_SIZE];
1775 int packet_num, ret = 0;
1776
1777 if (avio_tell(s->pb) != ts->last_pos) {
1778 int i;
1779 av_dlog(ts->stream, "Skipping after seek\n");
1780 /* seek detected, flush pes buffer */
1781 for (i = 0; i < NB_PID_MAX; i++) {
1782 if (ts->pids[i]) {
1783 if (ts->pids[i]->type == MPEGTS_PES) {
1784 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1785 av_freep(&pes->buffer);
1786 pes->data_index = 0;
1787 pes->state = MPEGTS_SKIP; /* skip until pes header */
1788 }
1789 ts->pids[i]->last_cc = -1;
1790 }
1791 }
1792 }
1793
1794 ts->stop_parse = 0;
1795 packet_num = 0;
1796 for(;;) {
1797 if (ts->stop_parse>0)
1798 break;
1799 packet_num++;
1800 if (nb_packets != 0 && packet_num >= nb_packets)
1801 break;
1802 ret = read_packet(s, packet, ts->raw_packet_size);
1803 if (ret != 0)
1804 break;
1805 ret = handle_packet(ts, packet);
1806 if (ret != 0)
1807 break;
1808 }
1809 ts->last_pos = avio_tell(s->pb);
1810 return ret;
1811 }
1812
1813 static int mpegts_probe(AVProbeData *p)
1814 {
1815 #if 1
1816 const int size= p->buf_size;
1817 int score, fec_score, dvhs_score;
1818 int check_count= size / TS_FEC_PACKET_SIZE;
1819 #define CHECK_COUNT 10
1820
1821 if (check_count < CHECK_COUNT)
1822 return -1;
1823
1824 score = analyze(p->buf, TS_PACKET_SIZE *check_count, TS_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1825 dvhs_score= analyze(p->buf, TS_DVHS_PACKET_SIZE*check_count, TS_DVHS_PACKET_SIZE, NULL)*CHECK_COUNT/check_count;
1826 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE *check_count, TS_FEC_PACKET_SIZE , NULL)*CHECK_COUNT/check_count;
1827 // av_log(NULL, AV_LOG_DEBUG, "score: %d, dvhs_score: %d, fec_score: %d \n", score, dvhs_score, fec_score);
1828
1829 // we need a clear definition for the returned score otherwise things will become messy sooner or later
1830 if (score > fec_score && score > dvhs_score && score > 6) return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
1831 else if(dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6) return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
1832 else if( fec_score > 6) return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
1833 else return -1;
1834 #else
1835 /* only use the extension for safer guess */
1836 if (av_match_ext(p->filename, "ts"))
1837 return AVPROBE_SCORE_MAX;
1838 else
1839 return 0;
1840 #endif
1841 }
1842
1843 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
1844 (-1) if not available */
1845 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
1846 const uint8_t *packet)
1847 {
1848 int afc, len, flags;
1849 const uint8_t *p;
1850 unsigned int v;
1851
1852 afc = (packet[3] >> 4) & 3;
1853 if (afc <= 1)
1854 return -1;
1855 p = packet + 4;
1856 len = p[0];
1857 p++;
1858 if (len == 0)
1859 return -1;
1860 flags = *p++;
1861 len--;
1862 if (!(flags & 0x10))
1863 return -1;
1864 if (len < 6)
1865 return -1;
1866 v = AV_RB32(p);
1867 *ppcr_high = ((int64_t)v << 1) | (p[4] >> 7);
1868 *ppcr_low = ((p[4] & 1) << 8) | p[5];
1869 return 0;
1870 }
1871
1872 static int mpegts_read_header(AVFormatContext *s,
1873 AVFormatParameters *ap)
1874 {
1875 MpegTSContext *ts = s->priv_data;
1876 AVIOContext *pb = s->pb;
1877 uint8_t buf[5*1024];
1878 int len;
1879 int64_t pos;
1880
1881 /* read the first 1024 bytes to get packet size */
1882 pos = avio_tell(pb);
1883 len = avio_read(pb, buf, sizeof(buf));
1884 if (len != sizeof(buf))
1885 goto fail;
1886 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
1887 if (ts->raw_packet_size <= 0)
1888 goto fail;
1889 ts->stream = s;
1890 ts->auto_guess = 0;
1891
1892 if (s->iformat == &ff_mpegts_demuxer) {
1893 /* normal demux */
1894
1895 /* first do a scan to get all the services */
1896 if (pb->seekable && avio_seek(pb, pos, SEEK_SET) < 0)
1897 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
1898
1899 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
1900
1901 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
1902
1903 handle_packets(ts, s->probesize / ts->raw_packet_size);
1904 /* if could not find service, enable auto_guess */
1905
1906 ts->auto_guess = 1;
1907
1908 av_dlog(ts->stream, "tuning done\n");
1909
1910 s->ctx_flags |= AVFMTCTX_NOHEADER;
1911 } else {
1912 AVStream *st;
1913 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
1914 int64_t pcrs[2], pcr_h;
1915 int packet_count[2];
1916 uint8_t packet[TS_PACKET_SIZE];
1917
1918 /* only read packets */
1919
1920 st = avformat_new_stream(s, NULL);
1921 if (!st)
1922 goto fail;
1923 avpriv_set_pts_info(st, 60, 1, 27000000);
1924 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1925 st->codec->codec_id = CODEC_ID_MPEG2TS;
1926
1927 /* we iterate until we find two PCRs to estimate the bitrate */
1928 pcr_pid = -1;
1929 nb_pcrs = 0;
1930 nb_packets = 0;
1931 for(;;) {
1932 ret = read_packet(s, packet, ts->raw_packet_size);
1933 if (ret < 0)
1934 return -1;
1935 pid = AV_RB16(packet + 1) & 0x1fff;
1936 if ((pcr_pid == -1 || pcr_pid == pid) &&
1937 parse_pcr(&pcr_h, &pcr_l, packet) == 0) {
1938 pcr_pid = pid;
1939 packet_count[nb_pcrs] = nb_packets;
1940 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
1941 nb_pcrs++;
1942 if (nb_pcrs >= 2)
1943 break;
1944 }
1945 nb_packets++;
1946 }
1947
1948 /* NOTE1: the bitrate is computed without the FEC */
1949 /* NOTE2: it is only the bitrate of the start of the stream */
1950 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
1951 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
1952 s->bit_rate = (TS_PACKET_SIZE * 8) * 27e6 / ts->pcr_incr;
1953 st->codec->bit_rate = s->bit_rate;
1954 st->start_time = ts->cur_pcr;
1955 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
1956 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
1957 }
1958
1959 avio_seek(pb, pos, SEEK_SET);
1960 return 0;
1961 fail:
1962 return -1;
1963 }
1964
1965 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
1966
1967 static int mpegts_raw_read_packet(AVFormatContext *s,
1968 AVPacket *pkt)
1969 {
1970 MpegTSContext *ts = s->priv_data;
1971 int ret, i;
1972 int64_t pcr_h, next_pcr_h, pos;
1973 int pcr_l, next_pcr_l;
1974 uint8_t pcr_buf[12];
1975
1976 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
1977 return AVERROR(ENOMEM);
1978 pkt->pos= avio_tell(s->pb);
1979 ret = read_packet(s, pkt->data, ts->raw_packet_size);
1980 if (ret < 0) {
1981 av_free_packet(pkt);
1982 return ret;
1983 }
1984 if (ts->mpeg2ts_compute_pcr) {
1985 /* compute exact PCR for each packet */
1986 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
1987 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
1988 pos = avio_tell(s->pb);
1989 for(i = 0; i < MAX_PACKET_READAHEAD; i++) {
1990 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
1991 avio_read(s->pb, pcr_buf, 12);
1992 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
1993 /* XXX: not precise enough */
1994 ts->pcr_incr = ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
1995 (i + 1);
1996 break;
1997 }
1998 }
1999 avio_seek(s->pb, pos, SEEK_SET);
2000 /* no next PCR found: we use previous increment */
2001 ts->cur_pcr = pcr_h * 300 + pcr_l;
2002 }
2003 pkt->pts = ts->cur_pcr;
2004 pkt->duration = ts->pcr_incr;
2005 ts->cur_pcr += ts->pcr_incr;
2006 }
2007 pkt->stream_index = 0;
2008 return 0;
2009 }
2010
2011 static int mpegts_read_packet(AVFormatContext *s,
2012 AVPacket *pkt)
2013 {
2014 MpegTSContext *ts = s->priv_data;
2015 int ret, i;
2016
2017 ts->pkt = pkt;
2018 ret = handle_packets(ts, 0);
2019 if (ret < 0) {
2020 /* flush pes data left */
2021 for (i = 0; i < NB_PID_MAX; i++) {
2022 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2023 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2024 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2025 new_pes_packet(pes, pkt);
2026 pes->state = MPEGTS_SKIP;
2027 ret = 0;
2028 break;
2029 }
2030 }
2031 }
2032 }
2033
2034 return ret;
2035 }
2036
2037 static int mpegts_read_close(AVFormatContext *s)
2038 {
2039 MpegTSContext *ts = s->priv_data;
2040 int i;
2041
2042 clear_programs(ts);
2043
2044 for(i=0;i<NB_PID_MAX;i++)
2045 if (ts->pids[i]) mpegts_close_filter(ts, ts->pids[i]);
2046
2047 return 0;
2048 }
2049
2050 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2051 int64_t *ppos, int64_t pos_limit)
2052 {
2053 MpegTSContext *ts = s->priv_data;
2054 int64_t pos, timestamp;
2055 uint8_t buf[TS_PACKET_SIZE];
2056 int pcr_l, pcr_pid = ((PESContext*)s->streams[stream_index]->priv_data)->pcr_pid;
2057 const int find_next= 1;
2058 pos = ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) * ts->raw_packet_size + ts->pos47;
2059 if (find_next) {
2060 for(;;) {
2061 avio_seek(s->pb, pos, SEEK_SET);
2062 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2063 return AV_NOPTS_VALUE;
2064 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2065 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2066 break;
2067 }
2068 pos += ts->raw_packet_size;
2069 }
2070 } else {
2071 for(;;) {
2072 pos -= ts->raw_packet_size;
2073 if (pos < 0)
2074 return AV_NOPTS_VALUE;
2075 avio_seek(s->pb, pos, SEEK_SET);
2076 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2077 return AV_NOPTS_VALUE;
2078 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2079 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2080 break;
2081 }
2082 }
2083 }
2084 *ppos = pos;
2085
2086 return timestamp;
2087 }
2088
2089 #ifdef USE_SYNCPOINT_SEARCH
2090
2091 static int read_seek2(AVFormatContext *s,
2092 int stream_index,
2093 int64_t min_ts,
2094 int64_t target_ts,
2095 int64_t max_ts,
2096 int flags)
2097 {
2098 int64_t pos;
2099
2100 int64_t ts_ret, ts_adj;
2101 int stream_index_gen_search;
2102 AVStream *st;
2103 AVParserState *backup;
2104
2105 backup = ff_store_parser_state(s);
2106
2107 // detect direction of seeking for search purposes
2108 flags |= (target_ts - min_ts > (uint64_t)(max_ts - target_ts)) ?
2109 AVSEEK_FLAG_BACKWARD : 0;
2110
2111 if (flags & AVSEEK_FLAG_BYTE) {
2112 // use position directly, we will search starting from it
2113 pos = target_ts;
2114 } else {
2115 // search for some position with good timestamp match
2116 if (stream_index < 0) {
2117 stream_index_gen_search = av_find_default_stream_index(s);
2118 if (stream_index_gen_search < 0) {
2119 ff_restore_parser_state(s, backup);
2120 return -1;
2121 }
2122
2123 st = s->streams[stream_index_gen_search];
2124 // timestamp for default must be expressed in AV_TIME_BASE units
2125 ts_adj = av_rescale(target_ts,
2126 st->time_base.den,
2127 AV_TIME_BASE * (int64_t)st->time_base.num);
2128 } else {
2129 ts_adj = target_ts;
2130 stream_index_gen_search = stream_index;
2131 }
2132 pos = ff_gen_search(s, stream_index_gen_search, ts_adj,
2133 0, INT64_MAX, -1,
2134 AV_NOPTS_VALUE,
2135 AV_NOPTS_VALUE,
2136 flags, &ts_ret, mpegts_get_pcr);
2137 if (pos < 0) {
2138 ff_restore_parser_state(s, backup);
2139 return -1;
2140 }
2141 }
2142
2143 // search for actual matching keyframe/starting position for all streams
2144 if (ff_gen_syncpoint_search(s, stream_index, pos,
2145 min_ts, target_ts, max_ts,
2146 flags) < 0) {
2147 ff_restore_parser_state(s, backup);
2148 return -1;
2149 }
2150
2151 ff_free_parser_state(s, backup);
2152 return 0;
2153 }
2154
2155 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
2156 {
2157 int ret;
2158 if (flags & AVSEEK_FLAG_BACKWARD) {
2159 flags &= ~AVSEEK_FLAG_BACKWARD;
2160 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, target_ts, flags);
2161 if (ret < 0)
2162 // for compatibility reasons, seek to the best-fitting timestamp
2163 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
2164 } else {
2165 ret = read_seek2(s, stream_index, target_ts, target_ts, INT64_MAX, flags);
2166 if (ret < 0)
2167 // for compatibility reasons, seek to the best-fitting timestamp
2168 ret = read_seek2(s, stream_index, INT64_MIN, target_ts, INT64_MAX, flags);
2169 }
2170 return ret;
2171 }
2172
2173 #else
2174
2175 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
2176 MpegTSContext *ts = s->priv_data;
2177 uint8_t buf[TS_PACKET_SIZE];
2178 int64_t pos;
2179
2180 if (ff_seek_frame_binary(s, stream_index, target_ts, flags) < 0)
2181 return -1;
2182
2183 pos= avio_tell(s->pb);
2184
2185 for(;;) {
2186 avio_seek(s->pb, pos, SEEK_SET);
2187 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2188 return -1;
2189 // pid = AV_RB16(buf + 1) & 0x1fff;
2190 if(buf[1] & 0x40) break;
2191 pos += ts->raw_packet_size;
2192 }
2193 avio_seek(s->pb, pos, SEEK_SET);
2194
2195 return 0;
2196 }
2197
2198 #endif
2199
2200 /**************************************************************/
2201 /* parsing functions - called from other demuxers such as RTP */
2202
2203 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2204 {
2205 MpegTSContext *ts;
2206
2207 ts = av_mallocz(sizeof(MpegTSContext));
2208 if (!ts)
2209 return NULL;
2210 /* no stream case, currently used by RTP */
2211 ts->raw_packet_size = TS_PACKET_SIZE;
2212 ts->stream = s;
2213 ts->auto_guess = 1;
2214 return ts;
2215 }
2216
2217 /* return the consumed length if a packet was output, or -1 if no
2218 packet is output */
2219 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2220 const uint8_t *buf, int len)
2221 {
2222 int len1;
2223
2224 len1 = len;
2225 ts->pkt = pkt;
2226 ts->stop_parse = 0;
2227 for(;;) {
2228 if (ts->stop_parse>0)
2229 break;
2230 if (len < TS_PACKET_SIZE)
2231 return -1;
2232 if (buf[0] != 0x47) {
2233 buf++;
2234 len--;
2235 } else {
2236 handle_packet(ts, buf);
2237 buf += TS_PACKET_SIZE;
2238 len -= TS_PACKET_SIZE;
2239 }
2240 }
2241 return len1 - len;
2242 }
2243
2244 void ff_mpegts_parse_close(MpegTSContext *ts)
2245 {
2246 int i;
2247
2248 for(i=0;i<NB_PID_MAX;i++)
2249 av_free(ts->pids[i]);
2250 av_free(ts);
2251 }
2252
2253 AVInputFormat ff_mpegts_demuxer = {
2254 .name = "mpegts",
2255 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 transport stream format"),
2256 .priv_data_size = sizeof(MpegTSContext),
2257 .read_probe = mpegts_probe,
2258 .read_header = mpegts_read_header,
2259 .read_packet = mpegts_read_packet,
2260 .read_close = mpegts_read_close,
2261 .read_seek = read_seek,
2262 .read_timestamp = mpegts_get_pcr,
2263 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
2264 #ifdef USE_SYNCPOINT_SEARCH
2265 .read_seek2 = read_seek2,
2266 #endif
2267 };
2268
2269 AVInputFormat ff_mpegtsraw_demuxer = {
2270 .name = "mpegtsraw",
2271 .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 raw transport stream format"),
2272 .priv_data_size = sizeof(MpegTSContext),
2273 .read_header = mpegts_read_header,
2274 .read_packet = mpegts_raw_read_packet,
2275 .read_close = mpegts_read_close,
2276 .read_seek = read_seek,
2277 .read_timestamp = mpegts_get_pcr,
2278 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
2279 #ifdef USE_SYNCPOINT_SEARCH
2280 .read_seek2 = read_seek2,
2281 #endif
2282 .priv_class = &mpegtsraw_class,
2283 };