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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / 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 FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/buffer.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/log.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/avassert.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 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
49 do { \
50 if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
51 (modulus) = (dividend) % (divisor); \
52 (prev_dividend) = (dividend); \
53 } while (0)
54
55 enum MpegTSFilterType {
56 MPEGTS_PES,
57 MPEGTS_SECTION,
58 MPEGTS_PCR,
59 };
60
61 typedef struct MpegTSFilter MpegTSFilter;
62
63 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
64 int is_start, int64_t pos);
65
66 typedef struct MpegTSPESFilter {
67 PESCallback *pes_cb;
68 void *opaque;
69 } MpegTSPESFilter;
70
71 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
72
73 typedef void SetServiceCallback (void *opaque, int ret);
74
75 typedef struct MpegTSSectionFilter {
76 int section_index;
77 int section_h_size;
78 uint8_t *section_buf;
79 unsigned int check_crc : 1;
80 unsigned int end_of_section_reached : 1;
81 SectionCallback *section_cb;
82 void *opaque;
83 } MpegTSSectionFilter;
84
85 struct MpegTSFilter {
86 int pid;
87 int es_id;
88 int last_cc; /* last cc code (-1 if first packet) */
89 int64_t last_pcr;
90 enum MpegTSFilterType type;
91 union {
92 MpegTSPESFilter pes_filter;
93 MpegTSSectionFilter section_filter;
94 } u;
95 };
96
97 #define MAX_PIDS_PER_PROGRAM 64
98 struct Program {
99 unsigned int id; // program id/service id
100 unsigned int nb_pids;
101 unsigned int pids[MAX_PIDS_PER_PROGRAM];
102
103 /** have we found pmt for this program */
104 int pmt_found;
105 };
106
107 struct MpegTSContext {
108 const AVClass *class;
109 /* user data */
110 AVFormatContext *stream;
111 /** raw packet size, including FEC if present */
112 int raw_packet_size;
113
114 int size_stat[3];
115 int size_stat_count;
116 #define SIZE_STAT_THRESHOLD 10
117
118 int64_t pos47_full;
119
120 /** if true, all pids are analyzed to find streams */
121 int auto_guess;
122
123 /** compute exact PCR for each transport stream packet */
124 int mpeg2ts_compute_pcr;
125
126 /** fix dvb teletext pts */
127 int fix_teletext_pts;
128
129 int64_t cur_pcr; /**< used to estimate the exact PCR */
130 int pcr_incr; /**< used to estimate the exact PCR */
131
132 /* data needed to handle file based ts */
133 /** stop parsing loop */
134 int stop_parse;
135 /** packet containing Audio/Video data */
136 AVPacket *pkt;
137 /** to detect seek */
138 int64_t last_pos;
139
140 int skip_changes;
141 int skip_clear;
142
143 int resync_size;
144
145 /******************************************/
146 /* private mpegts data */
147 /* scan context */
148 /** structure to keep track of Program->pids mapping */
149 unsigned int nb_prg;
150 struct Program *prg;
151
152 int8_t crc_validity[NB_PID_MAX];
153 /** filters for various streams specified by PMT + for the PAT and PMT */
154 MpegTSFilter *pids[NB_PID_MAX];
155 int current_pid;
156 };
157
158 #define MPEGTS_OPTIONS \
159 { "resync_size", "Size limit for looking up a new synchronization.", offsetof(MpegTSContext, resync_size), AV_OPT_TYPE_INT, { .i64 = MAX_RESYNC_SIZE}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }
160
161 static const AVOption options[] = {
162 MPEGTS_OPTIONS,
163 {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
164 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
165 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
166 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
167 {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
168 {.i64 = 0}, 0, 1, 0 },
169 {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
170 {.i64 = 0}, 0, 1, 0 },
171 { NULL },
172 };
173
174 static const AVClass mpegts_class = {
175 .class_name = "mpegts demuxer",
176 .item_name = av_default_item_name,
177 .option = options,
178 .version = LIBAVUTIL_VERSION_INT,
179 };
180
181 static const AVOption raw_options[] = {
182 MPEGTS_OPTIONS,
183 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
184 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
185 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
186 { "ts_packetsize", "Output option carrying the raw packet size.",
187 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
188 { .i64 = 0 }, 0, 0,
189 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
190 { NULL },
191 };
192
193 static const AVClass mpegtsraw_class = {
194 .class_name = "mpegtsraw demuxer",
195 .item_name = av_default_item_name,
196 .option = raw_options,
197 .version = LIBAVUTIL_VERSION_INT,
198 };
199
200 /* TS stream handling */
201
202 enum MpegTSState {
203 MPEGTS_HEADER = 0,
204 MPEGTS_PESHEADER,
205 MPEGTS_PESHEADER_FILL,
206 MPEGTS_PAYLOAD,
207 MPEGTS_SKIP,
208 };
209
210 /* enough for PES header + length */
211 #define PES_START_SIZE 6
212 #define PES_HEADER_SIZE 9
213 #define MAX_PES_HEADER_SIZE (9 + 255)
214
215 typedef struct PESContext {
216 int pid;
217 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
218 int stream_type;
219 MpegTSContext *ts;
220 AVFormatContext *stream;
221 AVStream *st;
222 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
223 enum MpegTSState state;
224 /* used to get the format */
225 int data_index;
226 int flags; /**< copied to the AVPacket flags */
227 int total_size;
228 int pes_header_size;
229 int extended_stream_id;
230 int64_t pts, dts;
231 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
232 uint8_t header[MAX_PES_HEADER_SIZE];
233 AVBufferRef *buffer;
234 SLConfigDescr sl;
235 } PESContext;
236
237 extern AVInputFormat ff_mpegts_demuxer;
238
239 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
240 {
241 int i;
242 for (i = 0; i < ts->nb_prg; i++) {
243 if (ts->prg[i].id == programid) {
244 return &ts->prg[i];
245 }
246 }
247 return NULL;
248 }
249
250 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
251 {
252 AVProgram *prg = NULL;
253 int i;
254
255 for (i = 0; i < ts->stream->nb_programs; i++)
256 if (ts->stream->programs[i]->id == programid) {
257 prg = ts->stream->programs[i];
258 break;
259 }
260 if (!prg)
261 return;
262 prg->nb_stream_indexes = 0;
263 }
264
265 static void clear_program(MpegTSContext *ts, unsigned int programid)
266 {
267 int i;
268
269 clear_avprogram(ts, programid);
270 for (i = 0; i < ts->nb_prg; i++)
271 if (ts->prg[i].id == programid) {
272 ts->prg[i].nb_pids = 0;
273 ts->prg[i].pmt_found = 0;
274 }
275 }
276
277 static void clear_programs(MpegTSContext *ts)
278 {
279 av_freep(&ts->prg);
280 ts->nb_prg = 0;
281 }
282
283 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
284 {
285 struct Program *p;
286 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
287 ts->nb_prg = 0;
288 return;
289 }
290 p = &ts->prg[ts->nb_prg];
291 p->id = programid;
292 p->nb_pids = 0;
293 p->pmt_found = 0;
294 ts->nb_prg++;
295 }
296
297 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
298 unsigned int pid)
299 {
300 struct Program *p = get_program(ts, programid);
301 if (!p)
302 return;
303
304 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
305 return;
306 p->pids[p->nb_pids++] = pid;
307 }
308
309 static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
310 {
311 struct Program *p = get_program(ts, programid);
312 if (!p)
313 return;
314
315 p->pmt_found = 1;
316 }
317
318 static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
319 {
320 int i;
321 for (i = 0; i < s->nb_programs; i++) {
322 if (s->programs[i]->id == programid) {
323 s->programs[i]->pcr_pid = pid;
324 break;
325 }
326 }
327 }
328
329 /**
330 * @brief discard_pid() decides if the pid is to be discarded according
331 * to caller's programs selection
332 * @param ts : - TS context
333 * @param pid : - pid
334 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
335 * 0 otherwise
336 */
337 static int discard_pid(MpegTSContext *ts, unsigned int pid)
338 {
339 int i, j, k;
340 int used = 0, discarded = 0;
341 struct Program *p;
342
343 /* If none of the programs have .discard=AVDISCARD_ALL then there's
344 * no way we have to discard this packet */
345 for (k = 0; k < ts->stream->nb_programs; k++)
346 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
347 break;
348 if (k == ts->stream->nb_programs)
349 return 0;
350
351 for (i = 0; i < ts->nb_prg; i++) {
352 p = &ts->prg[i];
353 for (j = 0; j < p->nb_pids; j++) {
354 if (p->pids[j] != pid)
355 continue;
356 // is program with id p->id set to be discarded?
357 for (k = 0; k < ts->stream->nb_programs; k++) {
358 if (ts->stream->programs[k]->id == p->id) {
359 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
360 discarded++;
361 else
362 used++;
363 }
364 }
365 }
366 }
367
368 return !used && discarded;
369 }
370
371 /**
372 * Assemble PES packets out of TS packets, and then call the "section_cb"
373 * function when they are complete.
374 */
375 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
376 const uint8_t *buf, int buf_size, int is_start)
377 {
378 MpegTSSectionFilter *tss = &tss1->u.section_filter;
379 int len;
380
381 if (is_start) {
382 memcpy(tss->section_buf, buf, buf_size);
383 tss->section_index = buf_size;
384 tss->section_h_size = -1;
385 tss->end_of_section_reached = 0;
386 } else {
387 if (tss->end_of_section_reached)
388 return;
389 len = 4096 - tss->section_index;
390 if (buf_size < len)
391 len = buf_size;
392 memcpy(tss->section_buf + tss->section_index, buf, len);
393 tss->section_index += len;
394 }
395
396 /* compute section length if possible */
397 if (tss->section_h_size == -1 && tss->section_index >= 3) {
398 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
399 if (len > 4096)
400 return;
401 tss->section_h_size = len;
402 }
403
404 if (tss->section_h_size != -1 &&
405 tss->section_index >= tss->section_h_size) {
406 int crc_valid = 1;
407 tss->end_of_section_reached = 1;
408
409 if (tss->check_crc) {
410 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
411 if (crc_valid) {
412 ts->crc_validity[ tss1->pid ] = 100;
413 }else if (ts->crc_validity[ tss1->pid ] > -10) {
414 ts->crc_validity[ tss1->pid ]--;
415 }else
416 crc_valid = 2;
417 }
418 if (crc_valid)
419 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
420 }
421 }
422
423 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
424 enum MpegTSFilterType type)
425 {
426 MpegTSFilter *filter;
427
428 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
429
430 if (pid >= NB_PID_MAX || ts->pids[pid])
431 return NULL;
432 filter = av_mallocz(sizeof(MpegTSFilter));
433 if (!filter)
434 return NULL;
435 ts->pids[pid] = filter;
436
437 filter->type = type;
438 filter->pid = pid;
439 filter->es_id = -1;
440 filter->last_cc = -1;
441 filter->last_pcr= -1;
442
443 return filter;
444 }
445
446 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
447 unsigned int pid,
448 SectionCallback *section_cb,
449 void *opaque,
450 int check_crc)
451 {
452 MpegTSFilter *filter;
453 MpegTSSectionFilter *sec;
454
455 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
456 return NULL;
457 sec = &filter->u.section_filter;
458 sec->section_cb = section_cb;
459 sec->opaque = opaque;
460 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
461 sec->check_crc = check_crc;
462 if (!sec->section_buf) {
463 av_free(filter);
464 return NULL;
465 }
466 return filter;
467 }
468
469 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
470 PESCallback *pes_cb,
471 void *opaque)
472 {
473 MpegTSFilter *filter;
474 MpegTSPESFilter *pes;
475
476 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
477 return NULL;
478
479 pes = &filter->u.pes_filter;
480 pes->pes_cb = pes_cb;
481 pes->opaque = opaque;
482 return filter;
483 }
484
485 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
486 {
487 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
488 }
489
490 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
491 {
492 int pid;
493
494 pid = filter->pid;
495 if (filter->type == MPEGTS_SECTION)
496 av_freep(&filter->u.section_filter.section_buf);
497 else if (filter->type == MPEGTS_PES) {
498 PESContext *pes = filter->u.pes_filter.opaque;
499 av_buffer_unref(&pes->buffer);
500 /* referenced private data will be freed later in
501 * avformat_close_input */
502 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
503 av_freep(&filter->u.pes_filter.opaque);
504 }
505 }
506
507 av_free(filter);
508 ts->pids[pid] = NULL;
509 }
510
511 static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
512 {
513 int stat[TS_MAX_PACKET_SIZE];
514 int stat_all = 0;
515 int i;
516 int best_score = 0;
517
518 memset(stat, 0, packet_size * sizeof(*stat));
519
520 for (i = 0; i < size - 3; i++) {
521 if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
522 int x = i % packet_size;
523 stat[x]++;
524 stat_all++;
525 if (stat[x] > best_score) {
526 best_score = stat[x];
527 if (index)
528 *index = x;
529 }
530 }
531 }
532
533 return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
534 }
535
536 /* autodetect fec presence. Must have at least 1024 bytes */
537 static int get_packet_size(const uint8_t *buf, int size)
538 {
539 int score, fec_score, dvhs_score;
540
541 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
542 return AVERROR_INVALIDDATA;
543
544 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
545 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
546 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
547 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
548 score, dvhs_score, fec_score);
549
550 if (score > fec_score && score > dvhs_score)
551 return TS_PACKET_SIZE;
552 else if (dvhs_score > score && dvhs_score > fec_score)
553 return TS_DVHS_PACKET_SIZE;
554 else if (score < fec_score && dvhs_score < fec_score)
555 return TS_FEC_PACKET_SIZE;
556 else
557 return AVERROR_INVALIDDATA;
558 }
559
560 typedef struct SectionHeader {
561 uint8_t tid;
562 uint16_t id;
563 uint8_t version;
564 uint8_t sec_num;
565 uint8_t last_sec_num;
566 } SectionHeader;
567
568 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
569 {
570 const uint8_t *p;
571 int c;
572
573 p = *pp;
574 if (p >= p_end)
575 return AVERROR_INVALIDDATA;
576 c = *p++;
577 *pp = p;
578 return c;
579 }
580
581 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
582 {
583 const uint8_t *p;
584 int c;
585
586 p = *pp;
587 if ((p + 1) >= p_end)
588 return AVERROR_INVALIDDATA;
589 c = AV_RB16(p);
590 p += 2;
591 *pp = p;
592 return c;
593 }
594
595 /* read and allocate a DVB string preceded by its length */
596 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
597 {
598 int len;
599 const uint8_t *p;
600 char *str;
601
602 p = *pp;
603 len = get8(&p, p_end);
604 if (len < 0)
605 return NULL;
606 if ((p + len) > p_end)
607 return NULL;
608 str = av_malloc(len + 1);
609 if (!str)
610 return NULL;
611 memcpy(str, p, len);
612 str[len] = '\0';
613 p += len;
614 *pp = p;
615 return str;
616 }
617
618 static int parse_section_header(SectionHeader *h,
619 const uint8_t **pp, const uint8_t *p_end)
620 {
621 int val;
622
623 val = get8(pp, p_end);
624 if (val < 0)
625 return val;
626 h->tid = val;
627 *pp += 2;
628 val = get16(pp, p_end);
629 if (val < 0)
630 return val;
631 h->id = val;
632 val = get8(pp, p_end);
633 if (val < 0)
634 return val;
635 h->version = (val >> 1) & 0x1f;
636 val = get8(pp, p_end);
637 if (val < 0)
638 return val;
639 h->sec_num = val;
640 val = get8(pp, p_end);
641 if (val < 0)
642 return val;
643 h->last_sec_num = val;
644 return 0;
645 }
646
647 typedef struct {
648 uint32_t stream_type;
649 enum AVMediaType codec_type;
650 enum AVCodecID codec_id;
651 } StreamType;
652
653 static const StreamType ISO_types[] = {
654 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
655 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
656 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
657 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
658 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
659 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
660 /* Makito encoder sets stream type 0x11 for AAC,
661 * so auto-detect LOAS/LATM instead of hardcoding it. */
662 #if !CONFIG_LOAS_DEMUXER
663 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
664 #endif
665 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
666 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
667 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
668 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
669 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
670 { 0 },
671 };
672
673 static const StreamType HDMV_types[] = {
674 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
675 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
676 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
677 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
678 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
679 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
680 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
681 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
682 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
683 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
684 { 0 },
685 };
686
687 /* ATSC ? */
688 static const StreamType MISC_types[] = {
689 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
690 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
691 { 0 },
692 };
693
694 static const StreamType REGD_types[] = {
695 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
696 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
697 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
698 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
699 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
700 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
701 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
702 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
703 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
704 { 0 },
705 };
706
707 static const StreamType METADATA_types[] = {
708 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
709 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
710 { 0 },
711 };
712
713 /* descriptor present */
714 static const StreamType DESC_types[] = {
715 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
716 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
717 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
718 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
719 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
720 { 0 },
721 };
722
723 static void mpegts_find_stream_type(AVStream *st,
724 uint32_t stream_type,
725 const StreamType *types)
726 {
727 if (avcodec_is_open(st->codec)) {
728 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
729 return;
730 }
731
732 for (; types->stream_type; types++)
733 if (stream_type == types->stream_type) {
734 st->codec->codec_type = types->codec_type;
735 st->codec->codec_id = types->codec_id;
736 st->request_probe = 0;
737 return;
738 }
739 }
740
741 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
742 uint32_t stream_type, uint32_t prog_reg_desc)
743 {
744 int old_codec_type = st->codec->codec_type;
745 int old_codec_id = st->codec->codec_id;
746
747 if (avcodec_is_open(st->codec)) {
748 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
749 return 0;
750 }
751
752 avpriv_set_pts_info(st, 33, 1, 90000);
753 st->priv_data = pes;
754 st->codec->codec_type = AVMEDIA_TYPE_DATA;
755 st->codec->codec_id = AV_CODEC_ID_NONE;
756 st->need_parsing = AVSTREAM_PARSE_FULL;
757 pes->st = st;
758 pes->stream_type = stream_type;
759
760 av_log(pes->stream, AV_LOG_DEBUG,
761 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
762 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
763
764 st->codec->codec_tag = pes->stream_type;
765
766 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
767 if ((prog_reg_desc == AV_RL32("HDMV") ||
768 prog_reg_desc == AV_RL32("HDPR")) &&
769 st->codec->codec_id == AV_CODEC_ID_NONE) {
770 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
771 if (pes->stream_type == 0x83) {
772 // HDMV TrueHD streams also contain an AC3 coded version of the
773 // audio track - add a second stream for this
774 AVStream *sub_st;
775 // priv_data cannot be shared between streams
776 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
777 if (!sub_pes)
778 return AVERROR(ENOMEM);
779 memcpy(sub_pes, pes, sizeof(*sub_pes));
780
781 sub_st = avformat_new_stream(pes->stream, NULL);
782 if (!sub_st) {
783 av_free(sub_pes);
784 return AVERROR(ENOMEM);
785 }
786
787 sub_st->id = pes->pid;
788 avpriv_set_pts_info(sub_st, 33, 1, 90000);
789 sub_st->priv_data = sub_pes;
790 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
791 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
792 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
793 sub_pes->sub_st = pes->sub_st = sub_st;
794 }
795 }
796 if (st->codec->codec_id == AV_CODEC_ID_NONE)
797 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
798 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
799 st->codec->codec_id = old_codec_id;
800 st->codec->codec_type = old_codec_type;
801 }
802
803 return 0;
804 }
805
806 static void reset_pes_packet_state(PESContext *pes)
807 {
808 pes->pts = AV_NOPTS_VALUE;
809 pes->dts = AV_NOPTS_VALUE;
810 pes->data_index = 0;
811 pes->flags = 0;
812 av_buffer_unref(&pes->buffer);
813 }
814
815 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
816 {
817 av_init_packet(pkt);
818
819 pkt->buf = pes->buffer;
820 pkt->data = pes->buffer->data;
821 pkt->size = pes->data_index;
822
823 if (pes->total_size != MAX_PES_PAYLOAD &&
824 pes->pes_header_size + pes->data_index != pes->total_size +
825 PES_START_SIZE) {
826 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
827 pes->flags |= AV_PKT_FLAG_CORRUPT;
828 }
829 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
830
831 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
832 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
833 pkt->stream_index = pes->sub_st->index;
834 else
835 pkt->stream_index = pes->st->index;
836 pkt->pts = pes->pts;
837 pkt->dts = pes->dts;
838 /* store position of first TS packet of this PES packet */
839 pkt->pos = pes->ts_packet_pos;
840 pkt->flags = pes->flags;
841
842 pes->buffer = NULL;
843 reset_pes_packet_state(pes);
844 }
845
846 static uint64_t get_ts64(GetBitContext *gb, int bits)
847 {
848 if (get_bits_left(gb) < bits)
849 return AV_NOPTS_VALUE;
850 return get_bits64(gb, bits);
851 }
852
853 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
854 const uint8_t *buf, int buf_size)
855 {
856 GetBitContext gb;
857 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
858 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
859 int dts_flag = -1, cts_flag = -1;
860 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
861 uint8_t buf_padded[128 + FF_INPUT_BUFFER_PADDING_SIZE];
862 int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - FF_INPUT_BUFFER_PADDING_SIZE);
863
864 memcpy(buf_padded, buf, buf_padded_size);
865
866 init_get_bits(&gb, buf_padded, buf_padded_size * 8);
867
868 if (sl->use_au_start)
869 au_start_flag = get_bits1(&gb);
870 if (sl->use_au_end)
871 au_end_flag = get_bits1(&gb);
872 if (!sl->use_au_start && !sl->use_au_end)
873 au_start_flag = au_end_flag = 1;
874 if (sl->ocr_len > 0)
875 ocr_flag = get_bits1(&gb);
876 if (sl->use_idle)
877 idle_flag = get_bits1(&gb);
878 if (sl->use_padding)
879 padding_flag = get_bits1(&gb);
880 if (padding_flag)
881 padding_bits = get_bits(&gb, 3);
882
883 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
884 if (sl->packet_seq_num_len)
885 skip_bits_long(&gb, sl->packet_seq_num_len);
886 if (sl->degr_prior_len)
887 if (get_bits1(&gb))
888 skip_bits(&gb, sl->degr_prior_len);
889 if (ocr_flag)
890 skip_bits_long(&gb, sl->ocr_len);
891 if (au_start_flag) {
892 if (sl->use_rand_acc_pt)
893 get_bits1(&gb);
894 if (sl->au_seq_num_len > 0)
895 skip_bits_long(&gb, sl->au_seq_num_len);
896 if (sl->use_timestamps) {
897 dts_flag = get_bits1(&gb);
898 cts_flag = get_bits1(&gb);
899 }
900 }
901 if (sl->inst_bitrate_len)
902 inst_bitrate_flag = get_bits1(&gb);
903 if (dts_flag == 1)
904 dts = get_ts64(&gb, sl->timestamp_len);
905 if (cts_flag == 1)
906 cts = get_ts64(&gb, sl->timestamp_len);
907 if (sl->au_len > 0)
908 skip_bits_long(&gb, sl->au_len);
909 if (inst_bitrate_flag)
910 skip_bits_long(&gb, sl->inst_bitrate_len);
911 }
912
913 if (dts != AV_NOPTS_VALUE)
914 pes->dts = dts;
915 if (cts != AV_NOPTS_VALUE)
916 pes->pts = cts;
917
918 if (sl->timestamp_len && sl->timestamp_res)
919 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
920
921 return (get_bits_count(&gb) + 7) >> 3;
922 }
923
924 /* return non zero if a packet could be constructed */
925 static int mpegts_push_data(MpegTSFilter *filter,
926 const uint8_t *buf, int buf_size, int is_start,
927 int64_t pos)
928 {
929 PESContext *pes = filter->u.pes_filter.opaque;
930 MpegTSContext *ts = pes->ts;
931 const uint8_t *p;
932 int len, code;
933
934 if (!ts->pkt)
935 return 0;
936
937 if (is_start) {
938 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
939 new_pes_packet(pes, ts->pkt);
940 ts->stop_parse = 1;
941 } else {
942 reset_pes_packet_state(pes);
943 }
944 pes->state = MPEGTS_HEADER;
945 pes->ts_packet_pos = pos;
946 }
947 p = buf;
948 while (buf_size > 0) {
949 switch (pes->state) {
950 case MPEGTS_HEADER:
951 len = PES_START_SIZE - pes->data_index;
952 if (len > buf_size)
953 len = buf_size;
954 memcpy(pes->header + pes->data_index, p, len);
955 pes->data_index += len;
956 p += len;
957 buf_size -= len;
958 if (pes->data_index == PES_START_SIZE) {
959 /* we got all the PES or section header. We can now
960 * decide */
961 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
962 pes->header[2] == 0x01) {
963 /* it must be an mpeg2 PES stream */
964 code = pes->header[3] | 0x100;
965 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
966 code);
967
968 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
969 (!pes->sub_st ||
970 pes->sub_st->discard == AVDISCARD_ALL)) ||
971 code == 0x1be) /* padding_stream */
972 goto skip;
973
974 /* stream not present in PMT */
975 if (!pes->st) {
976 if (ts->skip_changes)
977 goto skip;
978
979 pes->st = avformat_new_stream(ts->stream, NULL);
980 if (!pes->st)
981 return AVERROR(ENOMEM);
982 pes->st->id = pes->pid;
983 mpegts_set_stream_info(pes->st, pes, 0, 0);
984 }
985
986 pes->total_size = AV_RB16(pes->header + 4);
987 /* NOTE: a zero total size means the PES size is
988 * unbounded */
989 if (!pes->total_size)
990 pes->total_size = MAX_PES_PAYLOAD;
991
992 /* allocate pes buffer */
993 pes->buffer = av_buffer_alloc(pes->total_size +
994 FF_INPUT_BUFFER_PADDING_SIZE);
995 if (!pes->buffer)
996 return AVERROR(ENOMEM);
997
998 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
999 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1000 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1001 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1002 pes->state = MPEGTS_PESHEADER;
1003 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1004 av_dlog(pes->stream,
1005 "pid=%x stream_type=%x probing\n",
1006 pes->pid,
1007 pes->stream_type);
1008 pes->st->request_probe = 1;
1009 }
1010 } else {
1011 pes->state = MPEGTS_PAYLOAD;
1012 pes->data_index = 0;
1013 }
1014 } else {
1015 /* otherwise, it should be a table */
1016 /* skip packet */
1017 skip:
1018 pes->state = MPEGTS_SKIP;
1019 continue;
1020 }
1021 }
1022 break;
1023 /**********************************************/
1024 /* PES packing parsing */
1025 case MPEGTS_PESHEADER:
1026 len = PES_HEADER_SIZE - pes->data_index;
1027 if (len < 0)
1028 return AVERROR_INVALIDDATA;
1029 if (len > buf_size)
1030 len = buf_size;
1031 memcpy(pes->header + pes->data_index, p, len);
1032 pes->data_index += len;
1033 p += len;
1034 buf_size -= len;
1035 if (pes->data_index == PES_HEADER_SIZE) {
1036 pes->pes_header_size = pes->header[8] + 9;
1037 pes->state = MPEGTS_PESHEADER_FILL;
1038 }
1039 break;
1040 case MPEGTS_PESHEADER_FILL:
1041 len = pes->pes_header_size - pes->data_index;
1042 if (len < 0)
1043 return AVERROR_INVALIDDATA;
1044 if (len > buf_size)
1045 len = buf_size;
1046 memcpy(pes->header + pes->data_index, p, len);
1047 pes->data_index += len;
1048 p += len;
1049 buf_size -= len;
1050 if (pes->data_index == pes->pes_header_size) {
1051 const uint8_t *r;
1052 unsigned int flags, pes_ext, skip;
1053
1054 flags = pes->header[7];
1055 r = pes->header + 9;
1056 pes->pts = AV_NOPTS_VALUE;
1057 pes->dts = AV_NOPTS_VALUE;
1058 if ((flags & 0xc0) == 0x80) {
1059 pes->dts = pes->pts = ff_parse_pes_pts(r);
1060 r += 5;
1061 } else if ((flags & 0xc0) == 0xc0) {
1062 pes->pts = ff_parse_pes_pts(r);
1063 r += 5;
1064 pes->dts = ff_parse_pes_pts(r);
1065 r += 5;
1066 }
1067 pes->extended_stream_id = -1;
1068 if (flags & 0x01) { /* PES extension */
1069 pes_ext = *r++;
1070 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1071 skip = (pes_ext >> 4) & 0xb;
1072 skip += skip & 0x9;
1073 r += skip;
1074 if ((pes_ext & 0x41) == 0x01 &&
1075 (r + 2) <= (pes->header + pes->pes_header_size)) {
1076 /* PES extension 2 */
1077 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1078 pes->extended_stream_id = r[1];
1079 }
1080 }
1081
1082 /* we got the full header. We parse it and get the payload */
1083 pes->state = MPEGTS_PAYLOAD;
1084 pes->data_index = 0;
1085 if (pes->stream_type == 0x12 && buf_size > 0) {
1086 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1087 buf_size);
1088 pes->pes_header_size += sl_header_bytes;
1089 p += sl_header_bytes;
1090 buf_size -= sl_header_bytes;
1091 }
1092 if (pes->stream_type == 0x15 && buf_size >= 5) {
1093 /* skip metadata access unit header */
1094 pes->pes_header_size += 5;
1095 p += 5;
1096 buf_size -= 5;
1097 }
1098 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1099 AVProgram *p = NULL;
1100 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1101 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1102 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1103 if (f) {
1104 AVStream *st = NULL;
1105 if (f->type == MPEGTS_PES) {
1106 PESContext *pcrpes = f->u.pes_filter.opaque;
1107 if (pcrpes)
1108 st = pcrpes->st;
1109 } else if (f->type == MPEGTS_PCR) {
1110 int i;
1111 for (i = 0; i < p->nb_stream_indexes; i++) {
1112 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1113 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1114 st = pst;
1115 }
1116 }
1117 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1118 // teletext packets do not always have correct timestamps,
1119 // the standard says they should be handled after 40.6 ms at most,
1120 // and the pcr error to this packet should be no more than 100 ms.
1121 // TODO: we should interpolate the PCR, not just use the last one
1122 int64_t pcr = f->last_pcr / 300;
1123 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1124 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1125 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1126 pes->pts = pes->dts = pcr;
1127 } else if (pes->dts > pcr + 3654 + 9000) {
1128 pes->pts = pes->dts = pcr + 3654 + 9000;
1129 }
1130 break;
1131 }
1132 }
1133 }
1134 }
1135 }
1136 }
1137 break;
1138 case MPEGTS_PAYLOAD:
1139 if (pes->buffer) {
1140 if (pes->data_index > 0 &&
1141 pes->data_index + buf_size > pes->total_size) {
1142 new_pes_packet(pes, ts->pkt);
1143 pes->total_size = MAX_PES_PAYLOAD;
1144 pes->buffer = av_buffer_alloc(pes->total_size +
1145 FF_INPUT_BUFFER_PADDING_SIZE);
1146 if (!pes->buffer)
1147 return AVERROR(ENOMEM);
1148 ts->stop_parse = 1;
1149 } else if (pes->data_index == 0 &&
1150 buf_size > pes->total_size) {
1151 // pes packet size is < ts size packet and pes data is padded with 0xff
1152 // not sure if this is legal in ts but see issue #2392
1153 buf_size = pes->total_size;
1154 }
1155 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1156 pes->data_index += buf_size;
1157 /* emit complete packets with known packet size
1158 * decreases demuxer delay for infrequent packets like subtitles from
1159 * a couple of seconds to milliseconds for properly muxed files.
1160 * total_size is the number of bytes following pes_packet_length
1161 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1162 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1163 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1164 ts->stop_parse = 1;
1165 new_pes_packet(pes, ts->pkt);
1166 }
1167 }
1168 buf_size = 0;
1169 break;
1170 case MPEGTS_SKIP:
1171 buf_size = 0;
1172 break;
1173 }
1174 }
1175
1176 return 0;
1177 }
1178
1179 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1180 {
1181 MpegTSFilter *tss;
1182 PESContext *pes;
1183
1184 /* if no pid found, then add a pid context */
1185 pes = av_mallocz(sizeof(PESContext));
1186 if (!pes)
1187 return 0;
1188 pes->ts = ts;
1189 pes->stream = ts->stream;
1190 pes->pid = pid;
1191 pes->pcr_pid = pcr_pid;
1192 pes->state = MPEGTS_SKIP;
1193 pes->pts = AV_NOPTS_VALUE;
1194 pes->dts = AV_NOPTS_VALUE;
1195 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1196 if (!tss) {
1197 av_free(pes);
1198 return 0;
1199 }
1200 return pes;
1201 }
1202
1203 #define MAX_LEVEL 4
1204 typedef struct {
1205 AVFormatContext *s;
1206 AVIOContext pb;
1207 Mp4Descr *descr;
1208 Mp4Descr *active_descr;
1209 int descr_count;
1210 int max_descr_count;
1211 int level;
1212 int predefined_SLConfigDescriptor_seen;
1213 } MP4DescrParseContext;
1214
1215 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1216 const uint8_t *buf, unsigned size,
1217 Mp4Descr *descr, int max_descr_count)
1218 {
1219 int ret;
1220 if (size > (1 << 30))
1221 return AVERROR_INVALIDDATA;
1222
1223 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1224 NULL, NULL, NULL, NULL)) < 0)
1225 return ret;
1226
1227 d->s = s;
1228 d->level = 0;
1229 d->descr_count = 0;
1230 d->descr = descr;
1231 d->active_descr = NULL;
1232 d->max_descr_count = max_descr_count;
1233
1234 return 0;
1235 }
1236
1237 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1238 {
1239 int64_t new_off = avio_tell(pb);
1240 (*len) -= new_off - *off;
1241 *off = new_off;
1242 }
1243
1244 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1245 int target_tag);
1246
1247 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1248 {
1249 while (len > 0) {
1250 int ret = parse_mp4_descr(d, off, len, 0);
1251 if (ret < 0)
1252 return ret;
1253 update_offsets(&d->pb, &off, &len);
1254 }
1255 return 0;
1256 }
1257
1258 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1259 {
1260 avio_rb16(&d->pb); // ID
1261 avio_r8(&d->pb);
1262 avio_r8(&d->pb);
1263 avio_r8(&d->pb);
1264 avio_r8(&d->pb);
1265 avio_r8(&d->pb);
1266 update_offsets(&d->pb, &off, &len);
1267 return parse_mp4_descr_arr(d, off, len);
1268 }
1269
1270 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1271 {
1272 int id_flags;
1273 if (len < 2)
1274 return 0;
1275 id_flags = avio_rb16(&d->pb);
1276 if (!(id_flags & 0x0020)) { // URL_Flag
1277 update_offsets(&d->pb, &off, &len);
1278 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1279 } else {
1280 return 0;
1281 }
1282 }
1283
1284 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1285 {
1286 int es_id = 0;
1287 if (d->descr_count >= d->max_descr_count)
1288 return AVERROR_INVALIDDATA;
1289 ff_mp4_parse_es_descr(&d->pb, &es_id);
1290 d->active_descr = d->descr + (d->descr_count++);
1291
1292 d->active_descr->es_id = es_id;
1293 update_offsets(&d->pb, &off, &len);
1294 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1295 update_offsets(&d->pb, &off, &len);
1296 if (len > 0)
1297 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1298 d->active_descr = NULL;
1299 return 0;
1300 }
1301
1302 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1303 int len)
1304 {
1305 Mp4Descr *descr = d->active_descr;
1306 if (!descr)
1307 return AVERROR_INVALIDDATA;
1308 d->active_descr->dec_config_descr = av_malloc(len);
1309 if (!descr->dec_config_descr)
1310 return AVERROR(ENOMEM);
1311 descr->dec_config_descr_len = len;
1312 avio_read(&d->pb, descr->dec_config_descr, len);
1313 return 0;
1314 }
1315
1316 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1317 {
1318 Mp4Descr *descr = d->active_descr;
1319 int predefined;
1320 if (!descr)
1321 return AVERROR_INVALIDDATA;
1322
1323 predefined = avio_r8(&d->pb);
1324 if (!predefined) {
1325 int lengths;
1326 int flags = avio_r8(&d->pb);
1327 descr->sl.use_au_start = !!(flags & 0x80);
1328 descr->sl.use_au_end = !!(flags & 0x40);
1329 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1330 descr->sl.use_padding = !!(flags & 0x08);
1331 descr->sl.use_timestamps = !!(flags & 0x04);
1332 descr->sl.use_idle = !!(flags & 0x02);
1333 descr->sl.timestamp_res = avio_rb32(&d->pb);
1334 avio_rb32(&d->pb);
1335 descr->sl.timestamp_len = avio_r8(&d->pb);
1336 if (descr->sl.timestamp_len > 64) {
1337 avpriv_request_sample(NULL, "timestamp_len > 64");
1338 descr->sl.timestamp_len = 64;
1339 return AVERROR_PATCHWELCOME;
1340 }
1341 descr->sl.ocr_len = avio_r8(&d->pb);
1342 descr->sl.au_len = avio_r8(&d->pb);
1343 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1344 lengths = avio_rb16(&d->pb);
1345 descr->sl.degr_prior_len = lengths >> 12;
1346 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1347 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1348 } else if (!d->predefined_SLConfigDescriptor_seen){
1349 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1350 d->predefined_SLConfigDescriptor_seen = 1;
1351 }
1352 return 0;
1353 }
1354
1355 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1356 int target_tag)
1357 {
1358 int tag;
1359 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1360 update_offsets(&d->pb, &off, &len);
1361 if (len < 0 || len1 > len || len1 <= 0) {
1362 av_log(d->s, AV_LOG_ERROR,
1363 "Tag %x length violation new length %d bytes remaining %d\n",
1364 tag, len1, len);
1365 return AVERROR_INVALIDDATA;
1366 }
1367
1368 if (d->level++ >= MAX_LEVEL) {
1369 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1370 goto done;
1371 }
1372
1373 if (target_tag && tag != target_tag) {
1374 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1375 target_tag);
1376 goto done;
1377 }
1378
1379 switch (tag) {
1380 case MP4IODescrTag:
1381 parse_MP4IODescrTag(d, off, len1);
1382 break;
1383 case MP4ODescrTag:
1384 parse_MP4ODescrTag(d, off, len1);
1385 break;
1386 case MP4ESDescrTag:
1387 parse_MP4ESDescrTag(d, off, len1);
1388 break;
1389 case MP4DecConfigDescrTag:
1390 parse_MP4DecConfigDescrTag(d, off, len1);
1391 break;
1392 case MP4SLDescrTag:
1393 parse_MP4SLDescrTag(d, off, len1);
1394 break;
1395 }
1396
1397
1398 done:
1399 d->level--;
1400 avio_seek(&d->pb, off + len1, SEEK_SET);
1401 return 0;
1402 }
1403
1404 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1405 Mp4Descr *descr, int *descr_count, int max_descr_count)
1406 {
1407 MP4DescrParseContext d;
1408 int ret;
1409
1410 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1411 if (ret < 0)
1412 return ret;
1413
1414 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1415
1416 *descr_count = d.descr_count;
1417 return ret;
1418 }
1419
1420 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1421 Mp4Descr *descr, int *descr_count, int max_descr_count)
1422 {
1423 MP4DescrParseContext d;
1424 int ret;
1425
1426 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1427 if (ret < 0)
1428 return ret;
1429
1430 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1431
1432 *descr_count = d.descr_count;
1433 return ret;
1434 }
1435
1436 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1437 int section_len)
1438 {
1439 MpegTSContext *ts = filter->u.section_filter.opaque;
1440 SectionHeader h;
1441 const uint8_t *p, *p_end;
1442 AVIOContext pb;
1443 int mp4_descr_count = 0;
1444 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1445 int i, pid;
1446 AVFormatContext *s = ts->stream;
1447
1448 p_end = section + section_len - 4;
1449 p = section;
1450 if (parse_section_header(&h, &p, p_end) < 0)
1451 return;
1452 if (h.tid != M4OD_TID)
1453 return;
1454
1455 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1456 MAX_MP4_DESCR_COUNT);
1457
1458 for (pid = 0; pid < NB_PID_MAX; pid++) {
1459 if (!ts->pids[pid])
1460 continue;
1461 for (i = 0; i < mp4_descr_count; i++) {
1462 PESContext *pes;
1463 AVStream *st;
1464 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1465 continue;
1466 if (ts->pids[pid]->type != MPEGTS_PES) {
1467 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1468 continue;
1469 }
1470 pes = ts->pids[pid]->u.pes_filter.opaque;
1471 st = pes->st;
1472 if (!st)
1473 continue;
1474
1475 pes->sl = mp4_descr[i].sl;
1476
1477 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1478 mp4_descr[i].dec_config_descr_len, 0,
1479 NULL, NULL, NULL, NULL);
1480 ff_mp4_read_dec_config_descr(s, st, &pb);
1481 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1482 st->codec->extradata_size > 0)
1483 st->need_parsing = 0;
1484 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1485 st->codec->extradata_size > 0)
1486 st->need_parsing = 0;
1487
1488 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1489 // do nothing
1490 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1491 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1492 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1493 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1494 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1495 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1496 }
1497 }
1498 for (i = 0; i < mp4_descr_count; i++)
1499 av_free(mp4_descr[i].dec_config_descr);
1500 }
1501
1502 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1503 const uint8_t **pp, const uint8_t *desc_list_end,
1504 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1505 MpegTSContext *ts)
1506 {
1507 const uint8_t *desc_end;
1508 int desc_len, desc_tag, desc_es_id;
1509 char language[252];
1510 int i;
1511
1512 desc_tag = get8(pp, desc_list_end);
1513 if (desc_tag < 0)
1514 return AVERROR_INVALIDDATA;
1515 desc_len = get8(pp, desc_list_end);
1516 if (desc_len < 0)
1517 return AVERROR_INVALIDDATA;
1518 desc_end = *pp + desc_len;
1519 if (desc_end > desc_list_end)
1520 return AVERROR_INVALIDDATA;
1521
1522 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1523
1524 if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1525 stream_type == STREAM_TYPE_PRIVATE_DATA)
1526 mpegts_find_stream_type(st, desc_tag, DESC_types);
1527
1528 switch (desc_tag) {
1529 case 0x1E: /* SL descriptor */
1530 desc_es_id = get16(pp, desc_end);
1531 if (ts && ts->pids[pid])
1532 ts->pids[pid]->es_id = desc_es_id;
1533 for (i = 0; i < mp4_descr_count; i++)
1534 if (mp4_descr[i].dec_config_descr_len &&
1535 mp4_descr[i].es_id == desc_es_id) {
1536 AVIOContext pb;
1537 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1538 mp4_descr[i].dec_config_descr_len, 0,
1539 NULL, NULL, NULL, NULL);
1540 ff_mp4_read_dec_config_descr(fc, st, &pb);
1541 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1542 st->codec->extradata_size > 0)
1543 st->need_parsing = 0;
1544 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1545 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1546 }
1547 break;
1548 case 0x1F: /* FMC descriptor */
1549 get16(pp, desc_end);
1550 if (mp4_descr_count > 0 &&
1551 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1552 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1553 AVIOContext pb;
1554 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1555 mp4_descr->dec_config_descr_len, 0,
1556 NULL, NULL, NULL, NULL);
1557 ff_mp4_read_dec_config_descr(fc, st, &pb);
1558 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1559 st->codec->extradata_size > 0) {
1560 st->request_probe = st->need_parsing = 0;
1561 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1562 }
1563 }
1564 break;
1565 case 0x56: /* DVB teletext descriptor */
1566 {
1567 uint8_t *extradata = NULL;
1568 int language_count = desc_len / 5;
1569
1570 if (desc_len > 0 && desc_len % 5 != 0)
1571 return AVERROR_INVALIDDATA;
1572
1573 if (language_count > 0) {
1574 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1575 if (language_count > sizeof(language) / 4) {
1576 language_count = sizeof(language) / 4;
1577 }
1578
1579 if (st->codec->extradata == NULL) {
1580 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1581 return AVERROR(ENOMEM);
1582 }
1583 }
1584
1585 if (st->codec->extradata_size < language_count * 2)
1586 return AVERROR_INVALIDDATA;
1587
1588 extradata = st->codec->extradata;
1589
1590 for (i = 0; i < language_count; i++) {
1591 language[i * 4 + 0] = get8(pp, desc_end);
1592 language[i * 4 + 1] = get8(pp, desc_end);
1593 language[i * 4 + 2] = get8(pp, desc_end);
1594 language[i * 4 + 3] = ',';
1595
1596 memcpy(extradata, *pp, 2);
1597 extradata += 2;
1598
1599 *pp += 2;
1600 }
1601
1602 language[i * 4 - 1] = 0;
1603 av_dict_set(&st->metadata, "language", language, 0);
1604 }
1605 }
1606 break;
1607 case 0x59: /* subtitling descriptor */
1608 {
1609 /* 8 bytes per DVB subtitle substream data:
1610 * ISO_639_language_code (3 bytes),
1611 * subtitling_type (1 byte),
1612 * composition_page_id (2 bytes),
1613 * ancillary_page_id (2 bytes) */
1614 int language_count = desc_len / 8;
1615
1616 if (desc_len > 0 && desc_len % 8 != 0)
1617 return AVERROR_INVALIDDATA;
1618
1619 if (language_count > 1) {
1620 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1621 }
1622
1623 if (language_count > 0) {
1624 uint8_t *extradata;
1625
1626 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1627 if (language_count > sizeof(language) / 4) {
1628 language_count = sizeof(language) / 4;
1629 }
1630
1631 if (st->codec->extradata == NULL) {
1632 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1633 return AVERROR(ENOMEM);
1634 }
1635 }
1636
1637 if (st->codec->extradata_size < language_count * 5)
1638 return AVERROR_INVALIDDATA;
1639
1640 extradata = st->codec->extradata;
1641
1642 for (i = 0; i < language_count; i++) {
1643 language[i * 4 + 0] = get8(pp, desc_end);
1644 language[i * 4 + 1] = get8(pp, desc_end);
1645 language[i * 4 + 2] = get8(pp, desc_end);
1646 language[i * 4 + 3] = ',';
1647
1648 /* hearing impaired subtitles detection using subtitling_type */
1649 switch (*pp[0]) {
1650 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1651 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1652 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1653 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1654 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1655 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1656 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1657 break;
1658 }
1659
1660 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1661 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1662 extradata += 5;
1663
1664 *pp += 4;
1665 }
1666
1667 language[i * 4 - 1] = 0;
1668 av_dict_set(&st->metadata, "language", language, 0);
1669 }
1670 }
1671 break;
1672 case 0x0a: /* ISO 639 language descriptor */
1673 for (i = 0; i + 4 <= desc_len; i += 4) {
1674 language[i + 0] = get8(pp, desc_end);
1675 language[i + 1] = get8(pp, desc_end);
1676 language[i + 2] = get8(pp, desc_end);
1677 language[i + 3] = ',';
1678 switch (get8(pp, desc_end)) {
1679 case 0x01:
1680 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1681 break;
1682 case 0x02:
1683 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1684 break;
1685 case 0x03:
1686 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1687 break;
1688 }
1689 }
1690 if (i && language[0]) {
1691 language[i - 1] = 0;
1692 av_dict_set(&st->metadata, "language", language, 0);
1693 }
1694 break;
1695 case 0x05: /* registration descriptor */
1696 st->codec->codec_tag = bytestream_get_le32(pp);
1697 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1698 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1699 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1700 break;
1701 case 0x52: /* stream identifier descriptor */
1702 st->stream_identifier = 1 + get8(pp, desc_end);
1703 break;
1704 case 0x26: /* metadata descriptor */
1705 if (get16(pp, desc_end) == 0xFFFF)
1706 *pp += 4;
1707 if (get8(pp, desc_end) == 0xFF) {
1708 st->codec->codec_tag = bytestream_get_le32(pp);
1709 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1710 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1711 }
1712 break;
1713 default:
1714 break;
1715 }
1716 *pp = desc_end;
1717 return 0;
1718 }
1719
1720 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1721 {
1722 MpegTSContext *ts = filter->u.section_filter.opaque;
1723 SectionHeader h1, *h = &h1;
1724 PESContext *pes;
1725 AVStream *st;
1726 const uint8_t *p, *p_end, *desc_list_end;
1727 int program_info_length, pcr_pid, pid, stream_type;
1728 int desc_list_len;
1729 uint32_t prog_reg_desc = 0; /* registration descriptor */
1730
1731 int mp4_descr_count = 0;
1732 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1733 int i;
1734
1735 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1736 hex_dump_debug(ts->stream, section, section_len);
1737
1738 p_end = section + section_len - 4;
1739 p = section;
1740 if (parse_section_header(h, &p, p_end) < 0)
1741 return;
1742
1743 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n",
1744 h->id, h->sec_num, h->last_sec_num);
1745
1746 if (h->tid != PMT_TID)
1747 return;
1748 if (ts->skip_changes)
1749 return;
1750
1751 clear_program(ts, h->id);
1752 pcr_pid = get16(&p, p_end);
1753 if (pcr_pid < 0)
1754 return;
1755 pcr_pid &= 0x1fff;
1756 add_pid_to_pmt(ts, h->id, pcr_pid);
1757 set_pcr_pid(ts->stream, h->id, pcr_pid);
1758
1759 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1760
1761 program_info_length = get16(&p, p_end);
1762 if (program_info_length < 0)
1763 return;
1764 program_info_length &= 0xfff;
1765 while (program_info_length >= 2) {
1766 uint8_t tag, len;
1767 tag = get8(&p, p_end);
1768 len = get8(&p, p_end);
1769
1770 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1771
1772 if (len > program_info_length - 2)
1773 // something else is broken, exit the program_descriptors_loop
1774 break;
1775 program_info_length -= len + 2;
1776 if (tag == 0x1d) { // IOD descriptor
1777 get8(&p, p_end); // scope
1778 get8(&p, p_end); // label
1779 len -= 2;
1780 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1781 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1782 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1783 prog_reg_desc = bytestream_get_le32(&p);
1784 len -= 4;
1785 }
1786 p += len;
1787 }
1788 p += program_info_length;
1789 if (p >= p_end)
1790 goto out;
1791
1792 // stop parsing after pmt, we found header
1793 if (!ts->stream->nb_streams)
1794 ts->stop_parse = 2;
1795
1796 set_pmt_found(ts, h->id);
1797
1798
1799 for (;;) {
1800 st = 0;
1801 pes = NULL;
1802 stream_type = get8(&p, p_end);
1803 if (stream_type < 0)
1804 break;
1805 pid = get16(&p, p_end);
1806 if (pid < 0)
1807 goto out;
1808 pid &= 0x1fff;
1809 if (pid == ts->current_pid)
1810 goto out;
1811
1812 /* now create stream */
1813 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1814 pes = ts->pids[pid]->u.pes_filter.opaque;
1815 if (!pes->st) {
1816 pes->st = avformat_new_stream(pes->stream, NULL);
1817 if (!pes->st)
1818 goto out;
1819 pes->st->id = pes->pid;
1820 }
1821 st = pes->st;
1822 } else if (stream_type != 0x13) {
1823 if (ts->pids[pid])
1824 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1825 pes = add_pes_stream(ts, pid, pcr_pid);
1826 if (pes) {
1827 st = avformat_new_stream(pes->stream, NULL);
1828 if (!st)
1829 goto out;
1830 st->id = pes->pid;
1831 }
1832 } else {
1833 int idx = ff_find_stream_index(ts->stream, pid);
1834 if (idx >= 0) {
1835 st = ts->stream->streams[idx];
1836 } else {
1837 st = avformat_new_stream(ts->stream, NULL);
1838 if (!st)
1839 goto out;
1840 st->id = pid;
1841 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1842 }
1843 }
1844
1845 if (!st)
1846 goto out;
1847
1848 if (pes && !pes->stream_type)
1849 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1850
1851 add_pid_to_pmt(ts, h->id, pid);
1852
1853 ff_program_add_stream_index(ts->stream, h->id, st->index);
1854
1855 desc_list_len = get16(&p, p_end);
1856 if (desc_list_len < 0)
1857 goto out;
1858 desc_list_len &= 0xfff;
1859 desc_list_end = p + desc_list_len;
1860 if (desc_list_end > p_end)
1861 goto out;
1862 for (;;) {
1863 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1864 desc_list_end, mp4_descr,
1865 mp4_descr_count, pid, ts) < 0)
1866 break;
1867
1868 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1869 stream_type == 0x83 && pes->sub_st) {
1870 ff_program_add_stream_index(ts->stream, h->id,
1871 pes->sub_st->index);
1872 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1873 }
1874 }
1875 p = desc_list_end;
1876 }
1877
1878 if (!ts->pids[pcr_pid])
1879 mpegts_open_pcr_filter(ts, pcr_pid);
1880
1881 out:
1882 for (i = 0; i < mp4_descr_count; i++)
1883 av_free(mp4_descr[i].dec_config_descr);
1884 }
1885
1886 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1887 {
1888 MpegTSContext *ts = filter->u.section_filter.opaque;
1889 SectionHeader h1, *h = &h1;
1890 const uint8_t *p, *p_end;
1891 int sid, pmt_pid;
1892 AVProgram *program;
1893
1894 av_dlog(ts->stream, "PAT:\n");
1895 hex_dump_debug(ts->stream, section, section_len);
1896
1897 p_end = section + section_len - 4;
1898 p = section;
1899 if (parse_section_header(h, &p, p_end) < 0)
1900 return;
1901 if (h->tid != PAT_TID)
1902 return;
1903 if (ts->skip_changes)
1904 return;
1905
1906 ts->stream->ts_id = h->id;
1907
1908 clear_programs(ts);
1909 for (;;) {
1910 sid = get16(&p, p_end);
1911 if (sid < 0)
1912 break;
1913 pmt_pid = get16(&p, p_end);
1914 if (pmt_pid < 0)
1915 break;
1916 pmt_pid &= 0x1fff;
1917
1918 if (pmt_pid == ts->current_pid)
1919 break;
1920
1921 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1922
1923 if (sid == 0x0000) {
1924 /* NIT info */
1925 } else {
1926 MpegTSFilter *fil = ts->pids[pmt_pid];
1927 program = av_new_program(ts->stream, sid);
1928 program->program_num = sid;
1929 program->pmt_pid = pmt_pid;
1930 if (fil)
1931 if ( fil->type != MPEGTS_SECTION
1932 || fil->pid != pmt_pid
1933 || fil->u.section_filter.section_cb != pmt_cb)
1934 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1935
1936 if (!ts->pids[pmt_pid])
1937 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1938 add_pat_entry(ts, sid);
1939 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1940 add_pid_to_pmt(ts, sid, pmt_pid);
1941 }
1942 }
1943
1944 if (sid < 0) {
1945 int i,j;
1946 for (j=0; j<ts->stream->nb_programs; j++) {
1947 for (i = 0; i < ts->nb_prg; i++)
1948 if (ts->prg[i].id == ts->stream->programs[j]->id)
1949 break;
1950 if (i==ts->nb_prg && !ts->skip_clear)
1951 clear_avprogram(ts, ts->stream->programs[j]->id);
1952 }
1953 }
1954 }
1955
1956 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1957 {
1958 MpegTSContext *ts = filter->u.section_filter.opaque;
1959 SectionHeader h1, *h = &h1;
1960 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1961 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1962 char *name, *provider_name;
1963
1964 av_dlog(ts->stream, "SDT:\n");
1965 hex_dump_debug(ts->stream, section, section_len);
1966
1967 p_end = section + section_len - 4;
1968 p = section;
1969 if (parse_section_header(h, &p, p_end) < 0)
1970 return;
1971 if (h->tid != SDT_TID)
1972 return;
1973 if (ts->skip_changes)
1974 return;
1975 onid = get16(&p, p_end);
1976 if (onid < 0)
1977 return;
1978 val = get8(&p, p_end);
1979 if (val < 0)
1980 return;
1981 for (;;) {
1982 sid = get16(&p, p_end);
1983 if (sid < 0)
1984 break;
1985 val = get8(&p, p_end);
1986 if (val < 0)
1987 break;
1988 desc_list_len = get16(&p, p_end);
1989 if (desc_list_len < 0)
1990 break;
1991 desc_list_len &= 0xfff;
1992 desc_list_end = p + desc_list_len;
1993 if (desc_list_end > p_end)
1994 break;
1995 for (;;) {
1996 desc_tag = get8(&p, desc_list_end);
1997 if (desc_tag < 0)
1998 break;
1999 desc_len = get8(&p, desc_list_end);
2000 desc_end = p + desc_len;
2001 if (desc_len < 0 || desc_end > desc_list_end)
2002 break;
2003
2004 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
2005 desc_tag, desc_len);
2006
2007 switch (desc_tag) {
2008 case 0x48:
2009 service_type = get8(&p, p_end);
2010 if (service_type < 0)
2011 break;
2012 provider_name = getstr8(&p, p_end);
2013 if (!provider_name)
2014 break;
2015 name = getstr8(&p, p_end);
2016 if (name) {
2017 AVProgram *program = av_new_program(ts->stream, sid);
2018 if (program) {
2019 av_dict_set(&program->metadata, "service_name", name, 0);
2020 av_dict_set(&program->metadata, "service_provider",
2021 provider_name, 0);
2022 }
2023 }
2024 av_free(name);
2025 av_free(provider_name);
2026 break;
2027 default:
2028 break;
2029 }
2030 p = desc_end;
2031 }
2032 p = desc_list_end;
2033 }
2034 }
2035
2036 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2037 const uint8_t *packet);
2038
2039 /* handle one TS packet */
2040 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2041 {
2042 MpegTSFilter *tss;
2043 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2044 has_adaptation, has_payload;
2045 const uint8_t *p, *p_end;
2046 int64_t pos;
2047
2048 pid = AV_RB16(packet + 1) & 0x1fff;
2049 if (pid && discard_pid(ts, pid))
2050 return 0;
2051 is_start = packet[1] & 0x40;
2052 tss = ts->pids[pid];
2053 if (ts->auto_guess && !tss && is_start) {
2054 add_pes_stream(ts, pid, -1);
2055 tss = ts->pids[pid];
2056 }
2057 if (!tss)
2058 return 0;
2059 ts->current_pid = pid;
2060
2061 afc = (packet[3] >> 4) & 3;
2062 if (afc == 0) /* reserved value */
2063 return 0;
2064 has_adaptation = afc & 2;
2065 has_payload = afc & 1;
2066 is_discontinuity = has_adaptation &&
2067 packet[4] != 0 && /* with length > 0 */
2068 (packet[5] & 0x80); /* and discontinuity indicated */
2069
2070 /* continuity check (currently not used) */
2071 cc = (packet[3] & 0xf);
2072 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2073 cc_ok = pid == 0x1FFF || // null packet PID
2074 is_discontinuity ||
2075 tss->last_cc < 0 ||
2076 expected_cc == cc;
2077
2078 tss->last_cc = cc;
2079 if (!cc_ok) {
2080 av_log(ts->stream, AV_LOG_DEBUG,
2081 "Continuity check failed for pid %d expected %d got %d\n",
2082 pid, expected_cc, cc);
2083 if (tss->type == MPEGTS_PES) {
2084 PESContext *pc = tss->u.pes_filter.opaque;
2085 pc->flags |= AV_PKT_FLAG_CORRUPT;
2086 }
2087 }
2088
2089 p = packet + 4;
2090 if (has_adaptation) {
2091 int64_t pcr_h;
2092 int pcr_l;
2093 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2094 tss->last_pcr = pcr_h * 300 + pcr_l;
2095 /* skip adaptation field */
2096 p += p[0] + 1;
2097 }
2098 /* if past the end of packet, ignore */
2099 p_end = packet + TS_PACKET_SIZE;
2100 if (p >= p_end || !has_payload)
2101 return 0;
2102
2103 pos = avio_tell(ts->stream->pb);
2104 if (pos >= 0) {
2105 av_assert0(pos >= TS_PACKET_SIZE);
2106 ts->pos47_full = pos - TS_PACKET_SIZE;
2107 }
2108
2109 if (tss->type == MPEGTS_SECTION) {
2110 if (is_start) {
2111 /* pointer field present */
2112 len = *p++;
2113 if (p + len > p_end)
2114 return 0;
2115 if (len && cc_ok) {
2116 /* write remaining section bytes */
2117 write_section_data(ts, tss,
2118 p, len, 0);
2119 /* check whether filter has been closed */
2120 if (!ts->pids[pid])
2121 return 0;
2122 }
2123 p += len;
2124 if (p < p_end) {
2125 write_section_data(ts, tss,
2126 p, p_end - p, 1);
2127 }
2128 } else {
2129 if (cc_ok) {
2130 write_section_data(ts, tss,
2131 p, p_end - p, 0);
2132 }
2133 }
2134
2135 // stop find_stream_info from waiting for more streams
2136 // when all programs have received a PMT
2137 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) {
2138 int i;
2139 for (i = 0; i < ts->nb_prg; i++) {
2140 if (!ts->prg[i].pmt_found)
2141 break;
2142 }
2143 if (i == ts->nb_prg && ts->nb_prg > 0) {
2144 if (ts->stream->nb_streams > 1 || pos > 100000) {
2145 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2146 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2147 }
2148 }
2149 }
2150
2151 } else {
2152 int ret;
2153 // Note: The position here points actually behind the current packet.
2154 if (tss->type == MPEGTS_PES) {
2155 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2156 pos - ts->raw_packet_size)) < 0)
2157 return ret;
2158 }
2159 }
2160
2161 return 0;
2162 }
2163
2164 static void reanalyze(MpegTSContext *ts) {
2165 AVIOContext *pb = ts->stream->pb;
2166 int64_t pos = avio_tell(pb);
2167 if (pos < 0)
2168 return;
2169 pos -= ts->pos47_full;
2170 if (pos == TS_PACKET_SIZE) {
2171 ts->size_stat[0] ++;
2172 } else if (pos == TS_DVHS_PACKET_SIZE) {
2173 ts->size_stat[1] ++;
2174 } else if (pos == TS_FEC_PACKET_SIZE) {
2175 ts->size_stat[2] ++;
2176 }
2177
2178 ts->size_stat_count ++;
2179 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2180 int newsize = 0;
2181 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2182 newsize = TS_PACKET_SIZE;
2183 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2184 newsize = TS_DVHS_PACKET_SIZE;
2185 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2186 newsize = TS_FEC_PACKET_SIZE;
2187 }
2188 if (newsize && newsize != ts->raw_packet_size) {
2189 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2190 ts->raw_packet_size = newsize;
2191 }
2192 ts->size_stat_count = 0;
2193 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2194 }
2195 }
2196
2197 /* XXX: try to find a better synchro over several packets (use
2198 * get_packet_size() ?) */
2199 static int mpegts_resync(AVFormatContext *s)
2200 {
2201 MpegTSContext *ts = s->priv_data;
2202 AVIOContext *pb = s->pb;
2203 int c, i;
2204
2205 for (i = 0; i < ts->resync_size; i++) {
2206 c = avio_r8(pb);
2207 if (avio_feof(pb))
2208 return AVERROR_EOF;
2209 if (c == 0x47) {
2210 avio_seek(pb, -1, SEEK_CUR);
2211 reanalyze(s->priv_data);
2212 return 0;
2213 }
2214 }
2215 av_log(s, AV_LOG_ERROR,
2216 "max resync size reached, could not find sync byte\n");
2217 /* no sync found */
2218 return AVERROR_INVALIDDATA;
2219 }
2220
2221 /* return AVERROR_something if error or EOF. Return 0 if OK. */
2222 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2223 const uint8_t **data)
2224 {
2225 AVIOContext *pb = s->pb;
2226 int len;
2227
2228 for (;;) {
2229 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2230 if (len != TS_PACKET_SIZE)
2231 return len < 0 ? len : AVERROR_EOF;
2232 /* check packet sync byte */
2233 if ((*data)[0] != 0x47) {
2234 /* find a new packet start */
2235 uint64_t pos = avio_tell(pb);
2236 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2237
2238 if (mpegts_resync(s) < 0)
2239 return AVERROR(EAGAIN);
2240 else
2241 continue;
2242 } else {
2243 break;
2244 }
2245 }
2246 return 0;
2247 }
2248
2249 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2250 {
2251 AVIOContext *pb = s->pb;
2252 int skip = raw_packet_size - TS_PACKET_SIZE;
2253 if (skip > 0)
2254 avio_skip(pb, skip);
2255 }
2256
2257 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2258 {
2259 AVFormatContext *s = ts->stream;
2260 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2261 const uint8_t *data;
2262 int64_t packet_num;
2263 int ret = 0;
2264
2265 if (avio_tell(s->pb) != ts->last_pos) {
2266 int i;
2267 av_dlog(ts->stream, "Skipping after seek\n");
2268 /* seek detected, flush pes buffer */
2269 for (i = 0; i < NB_PID_MAX; i++) {
2270 if (ts->pids[i]) {
2271 if (ts->pids[i]->type == MPEGTS_PES) {
2272 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2273 av_buffer_unref(&pes->buffer);
2274 pes->data_index = 0;
2275 pes->state = MPEGTS_SKIP; /* skip until pes header */
2276 }
2277 ts->pids[i]->last_cc = -1;
2278 ts->pids[i]->last_pcr = -1;
2279 }
2280 }
2281 }
2282
2283 ts->stop_parse = 0;
2284 packet_num = 0;
2285 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2286 for (;;) {
2287 packet_num++;
2288 if (nb_packets != 0 && packet_num >= nb_packets ||
2289 ts->stop_parse > 1) {
2290 ret = AVERROR(EAGAIN);
2291 break;
2292 }
2293 if (ts->stop_parse > 0)
2294 break;
2295
2296 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2297 if (ret != 0)
2298 break;
2299 ret = handle_packet(ts, data);
2300 finished_reading_packet(s, ts->raw_packet_size);
2301 if (ret != 0)
2302 break;
2303 }
2304 ts->last_pos = avio_tell(s->pb);
2305 return ret;
2306 }
2307
2308 static int mpegts_probe(AVProbeData *p)
2309 {
2310 const int size = p->buf_size;
2311 int maxscore = 0;
2312 int sumscore = 0;
2313 int i;
2314 int check_count = size / TS_FEC_PACKET_SIZE;
2315 #define CHECK_COUNT 10
2316 #define CHECK_BLOCK 100
2317
2318 if (check_count < CHECK_COUNT)
2319 return AVERROR_INVALIDDATA;
2320
2321 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2322 int left = FFMIN(check_count - i, CHECK_BLOCK);
2323 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2324 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2325 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2326 score = FFMAX3(score, dvhs_score, fec_score);
2327 sumscore += score;
2328 maxscore = FFMAX(maxscore, score);
2329 }
2330
2331 sumscore = sumscore * CHECK_COUNT / check_count;
2332 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2333
2334 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2335
2336 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2337 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2338 else
2339 return AVERROR_INVALIDDATA;
2340 }
2341
2342 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2343 * (-1) if not available */
2344 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2345 {
2346 int afc, len, flags;
2347 const uint8_t *p;
2348 unsigned int v;
2349
2350 afc = (packet[3] >> 4) & 3;
2351 if (afc <= 1)
2352 return AVERROR_INVALIDDATA;
2353 p = packet + 4;
2354 len = p[0];
2355 p++;
2356 if (len == 0)
2357 return AVERROR_INVALIDDATA;
2358 flags = *p++;
2359 len--;
2360 if (!(flags & 0x10))
2361 return AVERROR_INVALIDDATA;
2362 if (len < 6)
2363 return AVERROR_INVALIDDATA;
2364 v = AV_RB32(p);
2365 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2366 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2367 return 0;
2368 }
2369
2370 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2371
2372 /* NOTE: We attempt to seek on non-seekable files as well, as the
2373 * probe buffer usually is big enough. Only warn if the seek failed
2374 * on files where the seek should work. */
2375 if (avio_seek(pb, pos, SEEK_SET) < 0)
2376 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2377 }
2378
2379 static int mpegts_read_header(AVFormatContext *s)
2380 {
2381 MpegTSContext *ts = s->priv_data;
2382 AVIOContext *pb = s->pb;
2383 uint8_t buf[8 * 1024] = {0};
2384 int len;
2385 int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2386
2387 ffio_ensure_seekback(pb, probesize);
2388
2389 /* read the first 8192 bytes to get packet size */
2390 pos = avio_tell(pb);
2391 len = avio_read(pb, buf, sizeof(buf));
2392 ts->raw_packet_size = get_packet_size(buf, len);
2393 if (ts->raw_packet_size <= 0) {
2394 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2395 ts->raw_packet_size = TS_PACKET_SIZE;
2396 }
2397 ts->stream = s;
2398 ts->auto_guess = 0;
2399
2400 if (s->iformat == &ff_mpegts_demuxer) {
2401 /* normal demux */
2402
2403 /* first do a scan to get all the services */
2404 seek_back(s, pb, pos);
2405
2406 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2407
2408 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2409
2410 handle_packets(ts, probesize / ts->raw_packet_size);
2411 /* if could not find service, enable auto_guess */
2412
2413 ts->auto_guess = 1;
2414
2415 av_dlog(ts->stream, "tuning done\n");
2416
2417 s->ctx_flags |= AVFMTCTX_NOHEADER;
2418 } else {
2419 AVStream *st;
2420 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2421 int64_t pcrs[2], pcr_h;
2422 int packet_count[2];
2423 uint8_t packet[TS_PACKET_SIZE];
2424 const uint8_t *data;
2425
2426 /* only read packets */
2427
2428 st = avformat_new_stream(s, NULL);
2429 if (!st)
2430 return AVERROR(ENOMEM);
2431 avpriv_set_pts_info(st, 60, 1, 27000000);
2432 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2433 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2434
2435 /* we iterate until we find two PCRs to estimate the bitrate */
2436 pcr_pid = -1;
2437 nb_pcrs = 0;
2438 nb_packets = 0;
2439 for (;;) {
2440 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2441 if (ret < 0)
2442 return ret;
2443 pid = AV_RB16(data + 1) & 0x1fff;
2444 if ((pcr_pid == -1 || pcr_pid == pid) &&
2445 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2446 finished_reading_packet(s, ts->raw_packet_size);
2447 pcr_pid = pid;
2448 packet_count[nb_pcrs] = nb_packets;
2449 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2450 nb_pcrs++;
2451 if (nb_pcrs >= 2)
2452 break;
2453 } else {
2454 finished_reading_packet(s, ts->raw_packet_size);
2455 }
2456 nb_packets++;
2457 }
2458
2459 /* NOTE1: the bitrate is computed without the FEC */
2460 /* NOTE2: it is only the bitrate of the start of the stream */
2461 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2462 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2463 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2464 st->codec->bit_rate = s->bit_rate;
2465 st->start_time = ts->cur_pcr;
2466 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2467 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2468 }
2469
2470 seek_back(s, pb, pos);
2471 return 0;
2472 }
2473
2474 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2475
2476 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2477 {
2478 MpegTSContext *ts = s->priv_data;
2479 int ret, i;
2480 int64_t pcr_h, next_pcr_h, pos;
2481 int pcr_l, next_pcr_l;
2482 uint8_t pcr_buf[12];
2483 const uint8_t *data;
2484
2485 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2486 return AVERROR(ENOMEM);
2487 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2488 pkt->pos = avio_tell(s->pb);
2489 if (ret < 0) {
2490 av_free_packet(pkt);
2491 return ret;
2492 }
2493 if (data != pkt->data)
2494 memcpy(pkt->data, data, ts->raw_packet_size);
2495 finished_reading_packet(s, ts->raw_packet_size);
2496 if (ts->mpeg2ts_compute_pcr) {
2497 /* compute exact PCR for each packet */
2498 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2499 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2500 pos = avio_tell(s->pb);
2501 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2502 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2503 avio_read(s->pb, pcr_buf, 12);
2504 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2505 /* XXX: not precise enough */
2506 ts->pcr_incr =
2507 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2508 (i + 1);
2509 break;
2510 }
2511 }
2512 avio_seek(s->pb, pos, SEEK_SET);
2513 /* no next PCR found: we use previous increment */
2514 ts->cur_pcr = pcr_h * 300 + pcr_l;
2515 }
2516 pkt->pts = ts->cur_pcr;
2517 pkt->duration = ts->pcr_incr;
2518 ts->cur_pcr += ts->pcr_incr;
2519 }
2520 pkt->stream_index = 0;
2521 return 0;
2522 }
2523
2524 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2525 {
2526 MpegTSContext *ts = s->priv_data;
2527 int ret, i;
2528
2529 pkt->size = -1;
2530 ts->pkt = pkt;
2531 ret = handle_packets(ts, 0);
2532 if (ret < 0) {
2533 av_free_packet(ts->pkt);
2534 /* flush pes data left */
2535 for (i = 0; i < NB_PID_MAX; i++)
2536 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2537 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2538 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2539 new_pes_packet(pes, pkt);
2540 pes->state = MPEGTS_SKIP;
2541 ret = 0;
2542 break;
2543 }
2544 }
2545 }
2546
2547 if (!ret && pkt->size < 0)
2548 ret = AVERROR(EINTR);
2549 return ret;
2550 }
2551
2552 static void mpegts_free(MpegTSContext *ts)
2553 {
2554 int i;
2555
2556 clear_programs(ts);
2557
2558 for (i = 0; i < NB_PID_MAX; i++)
2559 if (ts->pids[i])
2560 mpegts_close_filter(ts, ts->pids[i]);
2561 }
2562
2563 static int mpegts_read_close(AVFormatContext *s)
2564 {
2565 MpegTSContext *ts = s->priv_data;
2566 mpegts_free(ts);
2567 return 0;
2568 }
2569
2570 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2571 int64_t *ppos, int64_t pos_limit)
2572 {
2573 MpegTSContext *ts = s->priv_data;
2574 int64_t pos, timestamp;
2575 uint8_t buf[TS_PACKET_SIZE];
2576 int pcr_l, pcr_pid =
2577 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2578 int pos47 = ts->pos47_full % ts->raw_packet_size;
2579 pos =
2580 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2581 ts->raw_packet_size + pos47;
2582 while(pos < pos_limit) {
2583 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2584 return AV_NOPTS_VALUE;
2585 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2586 return AV_NOPTS_VALUE;
2587 if (buf[0] != 0x47) {
2588 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2589 if (mpegts_resync(s) < 0)
2590 return AV_NOPTS_VALUE;
2591 pos = avio_tell(s->pb);
2592 continue;
2593 }
2594 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2595 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2596 *ppos = pos;
2597 return timestamp;
2598 }
2599 pos += ts->raw_packet_size;
2600 }
2601
2602 return AV_NOPTS_VALUE;
2603 }
2604
2605 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2606 int64_t *ppos, int64_t pos_limit)
2607 {
2608 MpegTSContext *ts = s->priv_data;
2609 int64_t pos;
2610 int pos47 = ts->pos47_full % ts->raw_packet_size;
2611 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2612 ff_read_frame_flush(s);
2613 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2614 return AV_NOPTS_VALUE;
2615 while(pos < pos_limit) {
2616 int ret;
2617 AVPacket pkt;
2618 av_init_packet(&pkt);
2619 ret = av_read_frame(s, &pkt);
2620 if (ret < 0)
2621 return AV_NOPTS_VALUE;
2622 av_free_packet(&pkt);
2623 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2624 ff_reduce_index(s, pkt.stream_index);
2625 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2626 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2627 *ppos = pkt.pos;
2628 return pkt.dts;
2629 }
2630 }
2631 pos = pkt.pos;
2632 }
2633
2634 return AV_NOPTS_VALUE;
2635 }
2636
2637 /**************************************************************/
2638 /* parsing functions - called from other demuxers such as RTP */
2639
2640 MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
2641 {
2642 MpegTSContext *ts;
2643
2644 ts = av_mallocz(sizeof(MpegTSContext));
2645 if (!ts)
2646 return NULL;
2647 /* no stream case, currently used by RTP */
2648 ts->raw_packet_size = TS_PACKET_SIZE;
2649 ts->stream = s;
2650 ts->auto_guess = 1;
2651 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2652 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2653
2654 return ts;
2655 }
2656
2657 /* return the consumed length if a packet was output, or -1 if no
2658 * packet is output */
2659 int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2660 const uint8_t *buf, int len)
2661 {
2662 int len1;
2663
2664 len1 = len;
2665 ts->pkt = pkt;
2666 for (;;) {
2667 ts->stop_parse = 0;
2668 if (len < TS_PACKET_SIZE)
2669 return AVERROR_INVALIDDATA;
2670 if (buf[0] != 0x47) {
2671 buf++;
2672 len--;
2673 } else {
2674 handle_packet(ts, buf);
2675 buf += TS_PACKET_SIZE;
2676 len -= TS_PACKET_SIZE;
2677 if (ts->stop_parse == 1)
2678 break;
2679 }
2680 }
2681 return len1 - len;
2682 }
2683
2684 void avpriv_mpegts_parse_close(MpegTSContext *ts)
2685 {
2686 mpegts_free(ts);
2687 av_free(ts);
2688 }
2689
2690 AVInputFormat ff_mpegts_demuxer = {
2691 .name = "mpegts",
2692 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2693 .priv_data_size = sizeof(MpegTSContext),
2694 .read_probe = mpegts_probe,
2695 .read_header = mpegts_read_header,
2696 .read_packet = mpegts_read_packet,
2697 .read_close = mpegts_read_close,
2698 .read_timestamp = mpegts_get_dts,
2699 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2700 .priv_class = &mpegts_class,
2701 };
2702
2703 AVInputFormat ff_mpegtsraw_demuxer = {
2704 .name = "mpegtsraw",
2705 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2706 .priv_data_size = sizeof(MpegTSContext),
2707 .read_header = mpegts_read_header,
2708 .read_packet = mpegts_raw_read_packet,
2709 .read_close = mpegts_read_close,
2710 .read_timestamp = mpegts_get_dts,
2711 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2712 .priv_class = &mpegtsraw_class,
2713 };
ffmpeg Piment Noir Debian package repository