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Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavformat / mpegts.c
CommitLineData
2ba45a60
DM		 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"
f6fa7814 32#include "libavcodec/opus.h"
2ba45a60
DM		 33#include "avformat.h"
34#include "mpegts.h"
35#include "internal.h"
36#include "avio_internal.h"
37#include "seek.h"
38#include "mpeg.h"
39#include "isom.h"
40
41/* maximum size in which we look for synchronisation if
42 * synchronisation is lost */
43#define MAX_RESYNC_SIZE 65536
44
45#define MAX_PES_PAYLOAD 200 * 1024
46
47#define MAX_MP4_DESCR_COUNT 16
48
49#define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
50 do { \
51 if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
52 (modulus) = (dividend) % (divisor); \
53 (prev_dividend) = (dividend); \
54 } while (0)
55
56enum MpegTSFilterType {
57 MPEGTS_PES,
58 MPEGTS_SECTION,
59 MPEGTS_PCR,
60};
61
62typedef struct MpegTSFilter MpegTSFilter;
63
64typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
65 int is_start, int64_t pos);
66
67typedef struct MpegTSPESFilter {
68 PESCallback *pes_cb;
69 void *opaque;
70} MpegTSPESFilter;
71
72typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
73
74typedef void SetServiceCallback (void *opaque, int ret);
75
76typedef struct MpegTSSectionFilter {
77 int section_index;
78 int section_h_size;
79 uint8_t *section_buf;
80 unsigned int check_crc : 1;
81 unsigned int end_of_section_reached : 1;
82 SectionCallback *section_cb;
83 void *opaque;
84} MpegTSSectionFilter;
85
86struct MpegTSFilter {
87 int pid;
88 int es_id;
89 int last_cc; /* last cc code (-1 if first packet) */
90 int64_t last_pcr;
91 enum MpegTSFilterType type;
92 union {
93 MpegTSPESFilter pes_filter;
94 MpegTSSectionFilter section_filter;
95 } u;
96};
97
98#define MAX_PIDS_PER_PROGRAM 64
99struct Program {
100 unsigned int id; // program id/service id
101 unsigned int nb_pids;
102 unsigned int pids[MAX_PIDS_PER_PROGRAM];
103
104 /** have we found pmt for this program */
105 int pmt_found;
106};
107
108struct MpegTSContext {
109 const AVClass *class;
110 /* user data */
111 AVFormatContext *stream;
112 /** raw packet size, including FEC if present */
113 int raw_packet_size;
114
115 int size_stat[3];
116 int size_stat_count;
117#define SIZE_STAT_THRESHOLD 10
118
119 int64_t pos47_full;
120
121 /** if true, all pids are analyzed to find streams */
122 int auto_guess;
123
124 /** compute exact PCR for each transport stream packet */
125 int mpeg2ts_compute_pcr;
126
127 /** fix dvb teletext pts */
128 int fix_teletext_pts;
129
130 int64_t cur_pcr; /**< used to estimate the exact PCR */
131 int pcr_incr; /**< used to estimate the exact PCR */
132
133 /* data needed to handle file based ts */
134 /** stop parsing loop */
135 int stop_parse;
136 /** packet containing Audio/Video data */
137 AVPacket *pkt;
138 /** to detect seek */
139 int64_t last_pos;
140
141 int skip_changes;
142 int skip_clear;
143
f6fa7814
DM		 144 int scan_all_pmts;
145
2ba45a60
DM		 146 int resync_size;
147
148 /******************************************/
149 /* private mpegts data */
150 /* scan context */
151 /** structure to keep track of Program->pids mapping */
152 unsigned int nb_prg;
153 struct Program *prg;
154
155 int8_t crc_validity[NB_PID_MAX];
156 /** filters for various streams specified by PMT + for the PAT and PMT */
157 MpegTSFilter *pids[NB_PID_MAX];
158 int current_pid;
159};
160
161#define MPEGTS_OPTIONS \
162 { "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 }
163
164static const AVOption options[] = {
165 MPEGTS_OPTIONS,
166 {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT,
167 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
168 {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
169 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
f6fa7814
DM		 170 {"scan_all_pmts", "Scan and combine all PMTs", offsetof(MpegTSContext, scan_all_pmts), AV_OPT_TYPE_INT,
171 { .i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM },
2ba45a60
DM		 172 {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT,
173 {.i64 = 0}, 0, 1, 0 },
174 {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT,
175 {.i64 = 0}, 0, 1, 0 },
176 { NULL },
177};
178
179static const AVClass mpegts_class = {
180 .class_name = "mpegts demuxer",
181 .item_name = av_default_item_name,
182 .option = options,
183 .version = LIBAVUTIL_VERSION_INT,
184};
185
186static const AVOption raw_options[] = {
187 MPEGTS_OPTIONS,
188 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
189 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
190 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
191 { "ts_packetsize", "Output option carrying the raw packet size.",
192 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
193 { .i64 = 0 }, 0, 0,
194 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
195 { NULL },
196};
197
198static const AVClass mpegtsraw_class = {
199 .class_name = "mpegtsraw demuxer",
200 .item_name = av_default_item_name,
201 .option = raw_options,
202 .version = LIBAVUTIL_VERSION_INT,
203};
204
205/* TS stream handling */
206
207enum MpegTSState {
208 MPEGTS_HEADER = 0,
209 MPEGTS_PESHEADER,
210 MPEGTS_PESHEADER_FILL,
211 MPEGTS_PAYLOAD,
212 MPEGTS_SKIP,
213};
214
215/* enough for PES header + length */
216#define PES_START_SIZE 6
217#define PES_HEADER_SIZE 9
218#define MAX_PES_HEADER_SIZE (9 + 255)
219
220typedef struct PESContext {
221 int pid;
222 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
223 int stream_type;
224 MpegTSContext *ts;
225 AVFormatContext *stream;
226 AVStream *st;
227 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
228 enum MpegTSState state;
229 /* used to get the format */
230 int data_index;
231 int flags; /**< copied to the AVPacket flags */
232 int total_size;
233 int pes_header_size;
234 int extended_stream_id;
235 int64_t pts, dts;
236 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
237 uint8_t header[MAX_PES_HEADER_SIZE];
238 AVBufferRef *buffer;
239 SLConfigDescr sl;
240} PESContext;
241
242extern AVInputFormat ff_mpegts_demuxer;
243
244static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
245{
246 int i;
247 for (i = 0; i < ts->nb_prg; i++) {
248 if (ts->prg[i].id == programid) {
249 return &ts->prg[i];
250 }
251 }
252 return NULL;
253}
254
255static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
256{
257 AVProgram *prg = NULL;
258 int i;
259
260 for (i = 0; i < ts->stream->nb_programs; i++)
261 if (ts->stream->programs[i]->id == programid) {
262 prg = ts->stream->programs[i];
263 break;
264 }
265 if (!prg)
266 return;
267 prg->nb_stream_indexes = 0;
268}
269
270static void clear_program(MpegTSContext *ts, unsigned int programid)
271{
272 int i;
273
274 clear_avprogram(ts, programid);
275 for (i = 0; i < ts->nb_prg; i++)
276 if (ts->prg[i].id == programid) {
277 ts->prg[i].nb_pids = 0;
278 ts->prg[i].pmt_found = 0;
279 }
280}
281
282static void clear_programs(MpegTSContext *ts)
283{
284 av_freep(&ts->prg);
285 ts->nb_prg = 0;
286}
287
288static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
289{
290 struct Program *p;
291 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
292 ts->nb_prg = 0;
293 return;
294 }
295 p = &ts->prg[ts->nb_prg];
296 p->id = programid;
297 p->nb_pids = 0;
298 p->pmt_found = 0;
299 ts->nb_prg++;
300}
301
302static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
303 unsigned int pid)
304{
305 struct Program *p = get_program(ts, programid);
f6fa7814 306 int i;
2ba45a60
DM		 307 if (!p)
308 return;
309
310 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
311 return;
f6fa7814
DM		 312
313 for (i = 0; i < p->nb_pids; i++)
314 if (p->pids[i] == pid)
315 return;
316
2ba45a60
DM		 317 p->pids[p->nb_pids++] = pid;
318}
319
320static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
321{
322 struct Program *p = get_program(ts, programid);
323 if (!p)
324 return;
325
326 p->pmt_found = 1;
327}
328
329static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid)
330{
331 int i;
332 for (i = 0; i < s->nb_programs; i++) {
333 if (s->programs[i]->id == programid) {
334 s->programs[i]->pcr_pid = pid;
335 break;
336 }
337 }
338}
339
340/**
341 * @brief discard_pid() decides if the pid is to be discarded according
342 * to caller's programs selection
343 * @param ts : - TS context
344 * @param pid : - pid
345 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
346 * 0 otherwise
347 */
348static int discard_pid(MpegTSContext *ts, unsigned int pid)
349{
350 int i, j, k;
351 int used = 0, discarded = 0;
352 struct Program *p;
353
354 /* If none of the programs have .discard=AVDISCARD_ALL then there's
355 * no way we have to discard this packet */
356 for (k = 0; k < ts->stream->nb_programs; k++)
357 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
358 break;
359 if (k == ts->stream->nb_programs)
360 return 0;
361
362 for (i = 0; i < ts->nb_prg; i++) {
363 p = &ts->prg[i];
364 for (j = 0; j < p->nb_pids; j++) {
365 if (p->pids[j] != pid)
366 continue;
367 // is program with id p->id set to be discarded?
368 for (k = 0; k < ts->stream->nb_programs; k++) {
369 if (ts->stream->programs[k]->id == p->id) {
370 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
371 discarded++;
372 else
373 used++;
374 }
375 }
376 }
377 }
378
379 return !used && discarded;
380}
381
382/**
383 * Assemble PES packets out of TS packets, and then call the "section_cb"
384 * function when they are complete.
385 */
386static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
387 const uint8_t *buf, int buf_size, int is_start)
388{
389 MpegTSSectionFilter *tss = &tss1->u.section_filter;
390 int len;
391
392 if (is_start) {
393 memcpy(tss->section_buf, buf, buf_size);
394 tss->section_index = buf_size;
395 tss->section_h_size = -1;
396 tss->end_of_section_reached = 0;
397 } else {
398 if (tss->end_of_section_reached)
399 return;
400 len = 4096 - tss->section_index;
401 if (buf_size < len)
402 len = buf_size;
403 memcpy(tss->section_buf + tss->section_index, buf, len);
404 tss->section_index += len;
405 }
406
407 /* compute section length if possible */
408 if (tss->section_h_size == -1 && tss->section_index >= 3) {
409 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
410 if (len > 4096)
411 return;
412 tss->section_h_size = len;
413 }
414
415 if (tss->section_h_size != -1 &&
416 tss->section_index >= tss->section_h_size) {
417 int crc_valid = 1;
418 tss->end_of_section_reached = 1;
419
420 if (tss->check_crc) {
421 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size);
422 if (crc_valid) {
423 ts->crc_validity[ tss1->pid ] = 100;
424 }else if (ts->crc_validity[ tss1->pid ] > -10) {
425 ts->crc_validity[ tss1->pid ]--;
426 }else
427 crc_valid = 2;
428 }
429 if (crc_valid)
430 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
431 }
432}
433
434static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
435 enum MpegTSFilterType type)
436{
437 MpegTSFilter *filter;
438
439 av_dlog(ts->stream, "Filter: pid=0x%x\n", pid);
440
441 if (pid >= NB_PID_MAX || ts->pids[pid])
442 return NULL;
443 filter = av_mallocz(sizeof(MpegTSFilter));
444 if (!filter)
445 return NULL;
446 ts->pids[pid] = filter;
447
448 filter->type = type;
449 filter->pid = pid;
450 filter->es_id = -1;
451 filter->last_cc = -1;
452 filter->last_pcr= -1;
453
454 return filter;
455}
456
457static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
458 unsigned int pid,
459 SectionCallback *section_cb,
460 void *opaque,
461 int check_crc)
462{
463 MpegTSFilter *filter;
464 MpegTSSectionFilter *sec;
465
466 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
467 return NULL;
468 sec = &filter->u.section_filter;
469 sec->section_cb = section_cb;
470 sec->opaque = opaque;
471 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
472 sec->check_crc = check_crc;
473 if (!sec->section_buf) {
474 av_free(filter);
475 return NULL;
476 }
477 return filter;
478}
479
480static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
481 PESCallback *pes_cb,
482 void *opaque)
483{
484 MpegTSFilter *filter;
485 MpegTSPESFilter *pes;
486
487 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
488 return NULL;
489
490 pes = &filter->u.pes_filter;
491 pes->pes_cb = pes_cb;
492 pes->opaque = opaque;
493 return filter;
494}
495
496static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
497{
498 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
499}
500
501static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
502{
503 int pid;
504
505 pid = filter->pid;
506 if (filter->type == MPEGTS_SECTION)
507 av_freep(&filter->u.section_filter.section_buf);
508 else if (filter->type == MPEGTS_PES) {
509 PESContext *pes = filter->u.pes_filter.opaque;
510 av_buffer_unref(&pes->buffer);
511 /* referenced private data will be freed later in
512 * avformat_close_input */
513 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
514 av_freep(&filter->u.pes_filter.opaque);
515 }
516 }
517
518 av_free(filter);
519 ts->pids[pid] = NULL;
520}
521
522static int analyze(const uint8_t *buf, int size, int packet_size, int *index)
523{
524 int stat[TS_MAX_PACKET_SIZE];
525 int stat_all = 0;
526 int i;
527 int best_score = 0;
528
529 memset(stat, 0, packet_size * sizeof(*stat));
530
531 for (i = 0; i < size - 3; i++) {
532 if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) {
533 int x = i % packet_size;
534 stat[x]++;
535 stat_all++;
536 if (stat[x] > best_score) {
537 best_score = stat[x];
538 if (index)
539 *index = x;
540 }
541 }
542 }
543
544 return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
545}
546
547/* autodetect fec presence. Must have at least 1024 bytes */
548static int get_packet_size(const uint8_t *buf, int size)
549{
550 int score, fec_score, dvhs_score;
551
552 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
553 return AVERROR_INVALIDDATA;
554
555 score = analyze(buf, size, TS_PACKET_SIZE, NULL);
556 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL);
557 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL);
558 av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n",
559 score, dvhs_score, fec_score);
560
561 if (score > fec_score && score > dvhs_score)
562 return TS_PACKET_SIZE;
563 else if (dvhs_score > score && dvhs_score > fec_score)
564 return TS_DVHS_PACKET_SIZE;
565 else if (score < fec_score && dvhs_score < fec_score)
566 return TS_FEC_PACKET_SIZE;
567 else
568 return AVERROR_INVALIDDATA;
569}
570
571typedef struct SectionHeader {
572 uint8_t tid;
573 uint16_t id;
574 uint8_t version;
575 uint8_t sec_num;
576 uint8_t last_sec_num;
577} SectionHeader;
578
579static inline int get8(const uint8_t **pp, const uint8_t *p_end)
580{
581 const uint8_t *p;
582 int c;
583
584 p = *pp;
585 if (p >= p_end)
586 return AVERROR_INVALIDDATA;
587 c = *p++;
588 *pp = p;
589 return c;
590}
591
592static inline int get16(const uint8_t **pp, const uint8_t *p_end)
593{
594 const uint8_t *p;
595 int c;
596
597 p = *pp;
598 if ((p + 1) >= p_end)
599 return AVERROR_INVALIDDATA;
600 c = AV_RB16(p);
601 p += 2;
602 *pp = p;
603 return c;
604}
605
606/* read and allocate a DVB string preceded by its length */
607static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
608{
609 int len;
610 const uint8_t *p;
611 char *str;
612
613 p = *pp;
614 len = get8(&p, p_end);
615 if (len < 0)
616 return NULL;
617 if ((p + len) > p_end)
618 return NULL;
619 str = av_malloc(len + 1);
620 if (!str)
621 return NULL;
622 memcpy(str, p, len);
623 str[len] = '\0';
624 p += len;
625 *pp = p;
626 return str;
627}
628
629static int parse_section_header(SectionHeader *h,
630 const uint8_t **pp, const uint8_t *p_end)
631{
632 int val;
633
634 val = get8(pp, p_end);
635 if (val < 0)
636 return val;
637 h->tid = val;
638 *pp += 2;
639 val = get16(pp, p_end);
640 if (val < 0)
641 return val;
642 h->id = val;
643 val = get8(pp, p_end);
644 if (val < 0)
645 return val;
646 h->version = (val >> 1) & 0x1f;
647 val = get8(pp, p_end);
648 if (val < 0)
649 return val;
650 h->sec_num = val;
651 val = get8(pp, p_end);
652 if (val < 0)
653 return val;
654 h->last_sec_num = val;
655 return 0;
656}
657
658typedef struct {
659 uint32_t stream_type;
660 enum AVMediaType codec_type;
661 enum AVCodecID codec_id;
662} StreamType;
663
664static const StreamType ISO_types[] = {
665 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
666 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
667 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
668 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
669 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
670 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
671 /* Makito encoder sets stream type 0x11 for AAC,
672 * so auto-detect LOAS/LATM instead of hardcoding it. */
673#if !CONFIG_LOAS_DEMUXER
674 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
675#endif
676 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
677 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
678 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
679 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
680 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
681 { 0 },
682};
683
684static const StreamType HDMV_types[] = {
685 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
686 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
687 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
688 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
689 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
690 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
691 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
692 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
693 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
694 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
695 { 0 },
696};
697
698/* ATSC ? */
699static const StreamType MISC_types[] = {
700 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
701 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
702 { 0 },
703};
704
705static const StreamType REGD_types[] = {
706 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
707 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
708 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
709 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
710 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
711 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
712 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
713 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
714 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
f6fa7814 715 { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
2ba45a60
DM		 716 { 0 },
717};
718
719static const StreamType METADATA_types[] = {
720 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
721 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
722 { 0 },
723};
724
725/* descriptor present */
726static const StreamType DESC_types[] = {
727 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
728 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
729 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
730 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
731 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
732 { 0 },
733};
734
735static void mpegts_find_stream_type(AVStream *st,
736 uint32_t stream_type,
737 const StreamType *types)
738{
739 if (avcodec_is_open(st->codec)) {
740 av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
741 return;
742 }
743
744 for (; types->stream_type; types++)
745 if (stream_type == types->stream_type) {
746 st->codec->codec_type = types->codec_type;
747 st->codec->codec_id = types->codec_id;
748 st->request_probe = 0;
749 return;
750 }
751}
752
753static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
754 uint32_t stream_type, uint32_t prog_reg_desc)
755{
756 int old_codec_type = st->codec->codec_type;
757 int old_codec_id = st->codec->codec_id;
758
759 if (avcodec_is_open(st->codec)) {
760 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n");
761 return 0;
762 }
763
764 avpriv_set_pts_info(st, 33, 1, 90000);
765 st->priv_data = pes;
766 st->codec->codec_type = AVMEDIA_TYPE_DATA;
767 st->codec->codec_id = AV_CODEC_ID_NONE;
768 st->need_parsing = AVSTREAM_PARSE_FULL;
769 pes->st = st;
770 pes->stream_type = stream_type;
771
772 av_log(pes->stream, AV_LOG_DEBUG,
773 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
774 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
775
776 st->codec->codec_tag = pes->stream_type;
777
778 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
779 if ((prog_reg_desc == AV_RL32("HDMV") ||
780 prog_reg_desc == AV_RL32("HDPR")) &&
781 st->codec->codec_id == AV_CODEC_ID_NONE) {
782 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
783 if (pes->stream_type == 0x83) {
784 // HDMV TrueHD streams also contain an AC3 coded version of the
785 // audio track - add a second stream for this
786 AVStream *sub_st;
787 // priv_data cannot be shared between streams
788 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
789 if (!sub_pes)
790 return AVERROR(ENOMEM);
791 memcpy(sub_pes, pes, sizeof(*sub_pes));
792
793 sub_st = avformat_new_stream(pes->stream, NULL);
794 if (!sub_st) {
795 av_free(sub_pes);
796 return AVERROR(ENOMEM);
797 }
798
799 sub_st->id = pes->pid;
800 avpriv_set_pts_info(sub_st, 33, 1, 90000);
801 sub_st->priv_data = sub_pes;
802 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
803 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
804 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
805 sub_pes->sub_st = pes->sub_st = sub_st;
806 }
807 }
808 if (st->codec->codec_id == AV_CODEC_ID_NONE)
809 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
810 if (st->codec->codec_id == AV_CODEC_ID_NONE) {
811 st->codec->codec_id = old_codec_id;
812 st->codec->codec_type = old_codec_type;
813 }
814
815 return 0;
816}
817
818static void reset_pes_packet_state(PESContext *pes)
819{
820 pes->pts = AV_NOPTS_VALUE;
821 pes->dts = AV_NOPTS_VALUE;
822 pes->data_index = 0;
823 pes->flags = 0;
824 av_buffer_unref(&pes->buffer);
825}
826
827static void new_pes_packet(PESContext *pes, AVPacket *pkt)
828{
829 av_init_packet(pkt);
830
831 pkt->buf = pes->buffer;
832 pkt->data = pes->buffer->data;
833 pkt->size = pes->data_index;
834
835 if (pes->total_size != MAX_PES_PAYLOAD &&
836 pes->pes_header_size + pes->data_index != pes->total_size +
837 PES_START_SIZE) {
838 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
839 pes->flags |= AV_PKT_FLAG_CORRUPT;
840 }
841 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
842
843 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
844 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
845 pkt->stream_index = pes->sub_st->index;
846 else
847 pkt->stream_index = pes->st->index;
848 pkt->pts = pes->pts;
849 pkt->dts = pes->dts;
850 /* store position of first TS packet of this PES packet */
851 pkt->pos = pes->ts_packet_pos;
852 pkt->flags = pes->flags;
853
854 pes->buffer = NULL;
855 reset_pes_packet_state(pes);
856}
857
858static uint64_t get_ts64(GetBitContext *gb, int bits)
859{
860 if (get_bits_left(gb) < bits)
861 return AV_NOPTS_VALUE;
862 return get_bits64(gb, bits);
863}
864
865static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
866 const uint8_t *buf, int buf_size)
867{
868 GetBitContext gb;
869 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
870 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
871 int dts_flag = -1, cts_flag = -1;
872 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
873 uint8_t buf_padded[128 + FF_INPUT_BUFFER_PADDING_SIZE];
874 int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - FF_INPUT_BUFFER_PADDING_SIZE);
875
876 memcpy(buf_padded, buf, buf_padded_size);
877
878 init_get_bits(&gb, buf_padded, buf_padded_size * 8);
879
880 if (sl->use_au_start)
881 au_start_flag = get_bits1(&gb);
882 if (sl->use_au_end)
883 au_end_flag = get_bits1(&gb);
884 if (!sl->use_au_start && !sl->use_au_end)
885 au_start_flag = au_end_flag = 1;
886 if (sl->ocr_len > 0)
887 ocr_flag = get_bits1(&gb);
888 if (sl->use_idle)
889 idle_flag = get_bits1(&gb);
890 if (sl->use_padding)
891 padding_flag = get_bits1(&gb);
892 if (padding_flag)
893 padding_bits = get_bits(&gb, 3);
894
895 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
896 if (sl->packet_seq_num_len)
897 skip_bits_long(&gb, sl->packet_seq_num_len);
898 if (sl->degr_prior_len)
899 if (get_bits1(&gb))
900 skip_bits(&gb, sl->degr_prior_len);
901 if (ocr_flag)
902 skip_bits_long(&gb, sl->ocr_len);
903 if (au_start_flag) {
904 if (sl->use_rand_acc_pt)
905 get_bits1(&gb);
906 if (sl->au_seq_num_len > 0)
907 skip_bits_long(&gb, sl->au_seq_num_len);
908 if (sl->use_timestamps) {
909 dts_flag = get_bits1(&gb);
910 cts_flag = get_bits1(&gb);
911 }
912 }
913 if (sl->inst_bitrate_len)
914 inst_bitrate_flag = get_bits1(&gb);
915 if (dts_flag == 1)
916 dts = get_ts64(&gb, sl->timestamp_len);
917 if (cts_flag == 1)
918 cts = get_ts64(&gb, sl->timestamp_len);
919 if (sl->au_len > 0)
920 skip_bits_long(&gb, sl->au_len);
921 if (inst_bitrate_flag)
922 skip_bits_long(&gb, sl->inst_bitrate_len);
923 }
924
925 if (dts != AV_NOPTS_VALUE)
926 pes->dts = dts;
927 if (cts != AV_NOPTS_VALUE)
928 pes->pts = cts;
929
930 if (sl->timestamp_len && sl->timestamp_res)
931 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
932
933 return (get_bits_count(&gb) + 7) >> 3;
934}
935
936/* return non zero if a packet could be constructed */
937static int mpegts_push_data(MpegTSFilter *filter,
938 const uint8_t *buf, int buf_size, int is_start,
939 int64_t pos)
940{
941 PESContext *pes = filter->u.pes_filter.opaque;
942 MpegTSContext *ts = pes->ts;
943 const uint8_t *p;
944 int len, code;
945
946 if (!ts->pkt)
947 return 0;
948
949 if (is_start) {
950 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
951 new_pes_packet(pes, ts->pkt);
952 ts->stop_parse = 1;
953 } else {
954 reset_pes_packet_state(pes);
955 }
956 pes->state = MPEGTS_HEADER;
957 pes->ts_packet_pos = pos;
958 }
959 p = buf;
960 while (buf_size > 0) {
961 switch (pes->state) {
962 case MPEGTS_HEADER:
963 len = PES_START_SIZE - pes->data_index;
964 if (len > buf_size)
965 len = buf_size;
966 memcpy(pes->header + pes->data_index, p, len);
967 pes->data_index += len;
968 p += len;
969 buf_size -= len;
970 if (pes->data_index == PES_START_SIZE) {
971 /* we got all the PES or section header. We can now
972 * decide */
973 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
974 pes->header[2] == 0x01) {
975 /* it must be an mpeg2 PES stream */
976 code = pes->header[3] | 0x100;
977 av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid,
978 code);
979
980 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
981 (!pes->sub_st ||
982 pes->sub_st->discard == AVDISCARD_ALL)) ||
983 code == 0x1be) /* padding_stream */
984 goto skip;
985
986 /* stream not present in PMT */
987 if (!pes->st) {
988 if (ts->skip_changes)
989 goto skip;
990
991 pes->st = avformat_new_stream(ts->stream, NULL);
992 if (!pes->st)
993 return AVERROR(ENOMEM);
994 pes->st->id = pes->pid;
995 mpegts_set_stream_info(pes->st, pes, 0, 0);
996 }
997
998 pes->total_size = AV_RB16(pes->header + 4);
999 /* NOTE: a zero total size means the PES size is
1000 * unbounded */
1001 if (!pes->total_size)
1002 pes->total_size = MAX_PES_PAYLOAD;
1003
1004 /* allocate pes buffer */
1005 pes->buffer = av_buffer_alloc(pes->total_size +
1006 FF_INPUT_BUFFER_PADDING_SIZE);
1007 if (!pes->buffer)
1008 return AVERROR(ENOMEM);
1009
1010 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1011 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1012 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1013 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1014 pes->state = MPEGTS_PESHEADER;
1015 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
1016 av_dlog(pes->stream,
1017 "pid=%x stream_type=%x probing\n",
1018 pes->pid,
1019 pes->stream_type);
1020 pes->st->request_probe = 1;
1021 }
1022 } else {
1023 pes->state = MPEGTS_PAYLOAD;
1024 pes->data_index = 0;
1025 }
1026 } else {
1027 /* otherwise, it should be a table */
1028 /* skip packet */
1029skip:
1030 pes->state = MPEGTS_SKIP;
1031 continue;
1032 }
1033 }
1034 break;
1035 /**********************************************/
1036 /* PES packing parsing */
1037 case MPEGTS_PESHEADER:
1038 len = PES_HEADER_SIZE - pes->data_index;
1039 if (len < 0)
1040 return AVERROR_INVALIDDATA;
1041 if (len > buf_size)
1042 len = buf_size;
1043 memcpy(pes->header + pes->data_index, p, len);
1044 pes->data_index += len;
1045 p += len;
1046 buf_size -= len;
1047 if (pes->data_index == PES_HEADER_SIZE) {
1048 pes->pes_header_size = pes->header[8] + 9;
1049 pes->state = MPEGTS_PESHEADER_FILL;
1050 }
1051 break;
1052 case MPEGTS_PESHEADER_FILL:
1053 len = pes->pes_header_size - pes->data_index;
1054 if (len < 0)
1055 return AVERROR_INVALIDDATA;
1056 if (len > buf_size)
1057 len = buf_size;
1058 memcpy(pes->header + pes->data_index, p, len);
1059 pes->data_index += len;
1060 p += len;
1061 buf_size -= len;
1062 if (pes->data_index == pes->pes_header_size) {
1063 const uint8_t *r;
1064 unsigned int flags, pes_ext, skip;
1065
1066 flags = pes->header[7];
1067 r = pes->header + 9;
1068 pes->pts = AV_NOPTS_VALUE;
1069 pes->dts = AV_NOPTS_VALUE;
1070 if ((flags & 0xc0) == 0x80) {
1071 pes->dts = pes->pts = ff_parse_pes_pts(r);
1072 r += 5;
1073 } else if ((flags & 0xc0) == 0xc0) {
1074 pes->pts = ff_parse_pes_pts(r);
1075 r += 5;
1076 pes->dts = ff_parse_pes_pts(r);
1077 r += 5;
1078 }
1079 pes->extended_stream_id = -1;
1080 if (flags & 0x01) { /* PES extension */
1081 pes_ext = *r++;
1082 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1083 skip = (pes_ext >> 4) & 0xb;
1084 skip += skip & 0x9;
1085 r += skip;
1086 if ((pes_ext & 0x41) == 0x01 &&
1087 (r + 2) <= (pes->header + pes->pes_header_size)) {
1088 /* PES extension 2 */
1089 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1090 pes->extended_stream_id = r[1];
1091 }
1092 }
1093
1094 /* we got the full header. We parse it and get the payload */
1095 pes->state = MPEGTS_PAYLOAD;
1096 pes->data_index = 0;
1097 if (pes->stream_type == 0x12 && buf_size > 0) {
1098 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1099 buf_size);
1100 pes->pes_header_size += sl_header_bytes;
1101 p += sl_header_bytes;
1102 buf_size -= sl_header_bytes;
1103 }
1104 if (pes->stream_type == 0x15 && buf_size >= 5) {
1105 /* skip metadata access unit header */
1106 pes->pes_header_size += 5;
1107 p += 5;
1108 buf_size -= 5;
1109 }
1110 if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) {
1111 AVProgram *p = NULL;
1112 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1113 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1114 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1115 if (f) {
1116 AVStream *st = NULL;
1117 if (f->type == MPEGTS_PES) {
1118 PESContext *pcrpes = f->u.pes_filter.opaque;
1119 if (pcrpes)
1120 st = pcrpes->st;
1121 } else if (f->type == MPEGTS_PCR) {
1122 int i;
1123 for (i = 0; i < p->nb_stream_indexes; i++) {
1124 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1125 if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO)
1126 st = pst;
1127 }
1128 }
1129 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
1130 // teletext packets do not always have correct timestamps,
1131 // the standard says they should be handled after 40.6 ms at most,
1132 // and the pcr error to this packet should be no more than 100 ms.
1133 // TODO: we should interpolate the PCR, not just use the last one
1134 int64_t pcr = f->last_pcr / 300;
1135 pes->st->pts_wrap_reference = st->pts_wrap_reference;
1136 pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
1137 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1138 pes->pts = pes->dts = pcr;
1139 } else if (pes->dts > pcr + 3654 + 9000) {
1140 pes->pts = pes->dts = pcr + 3654 + 9000;
1141 }
1142 break;
1143 }
1144 }
1145 }
1146 }
1147 }
1148 }
1149 break;
1150 case MPEGTS_PAYLOAD:
1151 if (pes->buffer) {
1152 if (pes->data_index > 0 &&
1153 pes->data_index + buf_size > pes->total_size) {
1154 new_pes_packet(pes, ts->pkt);
1155 pes->total_size = MAX_PES_PAYLOAD;
1156 pes->buffer = av_buffer_alloc(pes->total_size +
1157 FF_INPUT_BUFFER_PADDING_SIZE);
1158 if (!pes->buffer)
1159 return AVERROR(ENOMEM);
1160 ts->stop_parse = 1;
1161 } else if (pes->data_index == 0 &&
1162 buf_size > pes->total_size) {
1163 // pes packet size is < ts size packet and pes data is padded with 0xff
1164 // not sure if this is legal in ts but see issue #2392
1165 buf_size = pes->total_size;
1166 }
1167 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1168 pes->data_index += buf_size;
1169 /* emit complete packets with known packet size
1170 * decreases demuxer delay for infrequent packets like subtitles from
1171 * a couple of seconds to milliseconds for properly muxed files.
1172 * total_size is the number of bytes following pes_packet_length
1173 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1174 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1175 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1176 ts->stop_parse = 1;
1177 new_pes_packet(pes, ts->pkt);
1178 }
1179 }
1180 buf_size = 0;
1181 break;
1182 case MPEGTS_SKIP:
1183 buf_size = 0;
1184 break;
1185 }
1186 }
1187
1188 return 0;
1189}
1190
1191static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1192{
1193 MpegTSFilter *tss;
1194 PESContext *pes;
1195
1196 /* if no pid found, then add a pid context */
1197 pes = av_mallocz(sizeof(PESContext));
1198 if (!pes)
1199 return 0;
1200 pes->ts = ts;
1201 pes->stream = ts->stream;
1202 pes->pid = pid;
1203 pes->pcr_pid = pcr_pid;
1204 pes->state = MPEGTS_SKIP;
1205 pes->pts = AV_NOPTS_VALUE;
1206 pes->dts = AV_NOPTS_VALUE;
1207 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1208 if (!tss) {
1209 av_free(pes);
1210 return 0;
1211 }
1212 return pes;
1213}
1214
1215#define MAX_LEVEL 4
1216typedef struct {
1217 AVFormatContext *s;
1218 AVIOContext pb;
1219 Mp4Descr *descr;
1220 Mp4Descr *active_descr;
1221 int descr_count;
1222 int max_descr_count;
1223 int level;
1224 int predefined_SLConfigDescriptor_seen;
1225} MP4DescrParseContext;
1226
1227static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1228 const uint8_t *buf, unsigned size,
1229 Mp4Descr *descr, int max_descr_count)
1230{
1231 int ret;
1232 if (size > (1 << 30))
1233 return AVERROR_INVALIDDATA;
1234
1235 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1236 NULL, NULL, NULL, NULL)) < 0)
1237 return ret;
1238
1239 d->s = s;
1240 d->level = 0;
1241 d->descr_count = 0;
1242 d->descr = descr;
1243 d->active_descr = NULL;
1244 d->max_descr_count = max_descr_count;
1245
1246 return 0;
1247}
1248
1249static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1250{
1251 int64_t new_off = avio_tell(pb);
1252 (*len) -= new_off - *off;
1253 *off = new_off;
1254}
1255
1256static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1257 int target_tag);
1258
1259static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1260{
1261 while (len > 0) {
1262 int ret = parse_mp4_descr(d, off, len, 0);
1263 if (ret < 0)
1264 return ret;
1265 update_offsets(&d->pb, &off, &len);
1266 }
1267 return 0;
1268}
1269
1270static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1271{
1272 avio_rb16(&d->pb); // ID
1273 avio_r8(&d->pb);
1274 avio_r8(&d->pb);
1275 avio_r8(&d->pb);
1276 avio_r8(&d->pb);
1277 avio_r8(&d->pb);
1278 update_offsets(&d->pb, &off, &len);
1279 return parse_mp4_descr_arr(d, off, len);
1280}
1281
1282static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1283{
1284 int id_flags;
1285 if (len < 2)
1286 return 0;
1287 id_flags = avio_rb16(&d->pb);
1288 if (!(id_flags & 0x0020)) { // URL_Flag
1289 update_offsets(&d->pb, &off, &len);
1290 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1291 } else {
1292 return 0;
1293 }
1294}
1295
1296static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1297{
1298 int es_id = 0;
1299 if (d->descr_count >= d->max_descr_count)
1300 return AVERROR_INVALIDDATA;
1301 ff_mp4_parse_es_descr(&d->pb, &es_id);
1302 d->active_descr = d->descr + (d->descr_count++);
1303
1304 d->active_descr->es_id = es_id;
1305 update_offsets(&d->pb, &off, &len);
1306 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1307 update_offsets(&d->pb, &off, &len);
1308 if (len > 0)
1309 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1310 d->active_descr = NULL;
1311 return 0;
1312}
1313
1314static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1315 int len)
1316{
1317 Mp4Descr *descr = d->active_descr;
1318 if (!descr)
1319 return AVERROR_INVALIDDATA;
1320 d->active_descr->dec_config_descr = av_malloc(len);
1321 if (!descr->dec_config_descr)
1322 return AVERROR(ENOMEM);
1323 descr->dec_config_descr_len = len;
1324 avio_read(&d->pb, descr->dec_config_descr, len);
1325 return 0;
1326}
1327
1328static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1329{
1330 Mp4Descr *descr = d->active_descr;
1331 int predefined;
1332 if (!descr)
1333 return AVERROR_INVALIDDATA;
1334
1335 predefined = avio_r8(&d->pb);
1336 if (!predefined) {
1337 int lengths;
1338 int flags = avio_r8(&d->pb);
1339 descr->sl.use_au_start = !!(flags & 0x80);
1340 descr->sl.use_au_end = !!(flags & 0x40);
1341 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1342 descr->sl.use_padding = !!(flags & 0x08);
1343 descr->sl.use_timestamps = !!(flags & 0x04);
1344 descr->sl.use_idle = !!(flags & 0x02);
1345 descr->sl.timestamp_res = avio_rb32(&d->pb);
1346 avio_rb32(&d->pb);
1347 descr->sl.timestamp_len = avio_r8(&d->pb);
1348 if (descr->sl.timestamp_len > 64) {
1349 avpriv_request_sample(NULL, "timestamp_len > 64");
1350 descr->sl.timestamp_len = 64;
1351 return AVERROR_PATCHWELCOME;
1352 }
1353 descr->sl.ocr_len = avio_r8(&d->pb);
1354 descr->sl.au_len = avio_r8(&d->pb);
1355 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1356 lengths = avio_rb16(&d->pb);
1357 descr->sl.degr_prior_len = lengths >> 12;
1358 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1359 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1360 } else if (!d->predefined_SLConfigDescriptor_seen){
1361 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1362 d->predefined_SLConfigDescriptor_seen = 1;
1363 }
1364 return 0;
1365}
1366
1367static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1368 int target_tag)
1369{
1370 int tag;
1371 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1372 update_offsets(&d->pb, &off, &len);
1373 if (len < 0 || len1 > len || len1 <= 0) {
1374 av_log(d->s, AV_LOG_ERROR,
1375 "Tag %x length violation new length %d bytes remaining %d\n",
1376 tag, len1, len);
1377 return AVERROR_INVALIDDATA;
1378 }
1379
1380 if (d->level++ >= MAX_LEVEL) {
1381 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1382 goto done;
1383 }
1384
1385 if (target_tag && tag != target_tag) {
1386 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1387 target_tag);
1388 goto done;
1389 }
1390
1391 switch (tag) {
1392 case MP4IODescrTag:
1393 parse_MP4IODescrTag(d, off, len1);
1394 break;
1395 case MP4ODescrTag:
1396 parse_MP4ODescrTag(d, off, len1);
1397 break;
1398 case MP4ESDescrTag:
1399 parse_MP4ESDescrTag(d, off, len1);
1400 break;
1401 case MP4DecConfigDescrTag:
1402 parse_MP4DecConfigDescrTag(d, off, len1);
1403 break;
1404 case MP4SLDescrTag:
1405 parse_MP4SLDescrTag(d, off, len1);
1406 break;
1407 }
1408
1409
1410done:
1411 d->level--;
1412 avio_seek(&d->pb, off + len1, SEEK_SET);
1413 return 0;
1414}
1415
1416static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1417 Mp4Descr *descr, int *descr_count, int max_descr_count)
1418{
1419 MP4DescrParseContext d;
1420 int ret;
1421
1422 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1423 if (ret < 0)
1424 return ret;
1425
1426 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1427
1428 *descr_count = d.descr_count;
1429 return ret;
1430}
1431
1432static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1433 Mp4Descr *descr, int *descr_count, int max_descr_count)
1434{
1435 MP4DescrParseContext d;
1436 int ret;
1437
1438 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1439 if (ret < 0)
1440 return ret;
1441
1442 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1443
1444 *descr_count = d.descr_count;
1445 return ret;
1446}
1447
1448static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1449 int section_len)
1450{
1451 MpegTSContext *ts = filter->u.section_filter.opaque;
1452 SectionHeader h;
1453 const uint8_t *p, *p_end;
1454 AVIOContext pb;
1455 int mp4_descr_count = 0;
1456 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1457 int i, pid;
1458 AVFormatContext *s = ts->stream;
1459
1460 p_end = section + section_len - 4;
1461 p = section;
1462 if (parse_section_header(&h, &p, p_end) < 0)
1463 return;
1464 if (h.tid != M4OD_TID)
1465 return;
1466
1467 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1468 MAX_MP4_DESCR_COUNT);
1469
1470 for (pid = 0; pid < NB_PID_MAX; pid++) {
1471 if (!ts->pids[pid])
1472 continue;
1473 for (i = 0; i < mp4_descr_count; i++) {
1474 PESContext *pes;
1475 AVStream *st;
1476 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1477 continue;
1478 if (ts->pids[pid]->type != MPEGTS_PES) {
1479 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1480 continue;
1481 }
1482 pes = ts->pids[pid]->u.pes_filter.opaque;
1483 st = pes->st;
1484 if (!st)
1485 continue;
1486
1487 pes->sl = mp4_descr[i].sl;
1488
1489 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1490 mp4_descr[i].dec_config_descr_len, 0,
1491 NULL, NULL, NULL, NULL);
1492 ff_mp4_read_dec_config_descr(s, st, &pb);
1493 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1494 st->codec->extradata_size > 0)
1495 st->need_parsing = 0;
1496 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1497 st->codec->extradata_size > 0)
1498 st->need_parsing = 0;
1499
1500 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1501 // do nothing
1502 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1503 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1504 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1505 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1506 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1507 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1508 }
1509 }
1510 for (i = 0; i < mp4_descr_count; i++)
1511 av_free(mp4_descr[i].dec_config_descr);
1512}
1513
f6fa7814
DM		 1514static const uint8_t opus_coupled_stream_cnt[9] = {
1515 1, 0, 1, 1, 2, 2, 2, 3, 3
1516};
1517
1518static const uint8_t opus_channel_map[8][8] = {
1519 { 0 },
1520 { 0,1 },
1521 { 0,2,1 },
1522 { 0,1,2,3 },
1523 { 0,4,1,2,3 },
1524 { 0,4,1,2,3,5 },
1525 { 0,4,1,2,3,5,6 },
1526 { 0,6,1,2,3,4,5,7 },
1527};
1528
2ba45a60
DM		 1529int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1530 const uint8_t **pp, const uint8_t *desc_list_end,
1531 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1532 MpegTSContext *ts)
1533{
1534 const uint8_t *desc_end;
f6fa7814 1535 int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
2ba45a60
DM		 1536 char language[252];
1537 int i;
1538
1539 desc_tag = get8(pp, desc_list_end);
1540 if (desc_tag < 0)
1541 return AVERROR_INVALIDDATA;
1542 desc_len = get8(pp, desc_list_end);
1543 if (desc_len < 0)
1544 return AVERROR_INVALIDDATA;
1545 desc_end = *pp + desc_len;
1546 if (desc_end > desc_list_end)
1547 return AVERROR_INVALIDDATA;
1548
1549 av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1550
1551 if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
1552 stream_type == STREAM_TYPE_PRIVATE_DATA)
1553 mpegts_find_stream_type(st, desc_tag, DESC_types);
1554
1555 switch (desc_tag) {
1556 case 0x1E: /* SL descriptor */
1557 desc_es_id = get16(pp, desc_end);
1558 if (ts && ts->pids[pid])
1559 ts->pids[pid]->es_id = desc_es_id;
1560 for (i = 0; i < mp4_descr_count; i++)
1561 if (mp4_descr[i].dec_config_descr_len &&
1562 mp4_descr[i].es_id == desc_es_id) {
1563 AVIOContext pb;
1564 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1565 mp4_descr[i].dec_config_descr_len, 0,
1566 NULL, NULL, NULL, NULL);
1567 ff_mp4_read_dec_config_descr(fc, st, &pb);
1568 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1569 st->codec->extradata_size > 0)
1570 st->need_parsing = 0;
1571 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1572 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1573 }
1574 break;
1575 case 0x1F: /* FMC descriptor */
1576 get16(pp, desc_end);
1577 if (mp4_descr_count > 0 &&
1578 (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) &&
1579 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1580 AVIOContext pb;
1581 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1582 mp4_descr->dec_config_descr_len, 0,
1583 NULL, NULL, NULL, NULL);
1584 ff_mp4_read_dec_config_descr(fc, st, &pb);
1585 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1586 st->codec->extradata_size > 0) {
1587 st->request_probe = st->need_parsing = 0;
1588 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1589 }
1590 }
1591 break;
1592 case 0x56: /* DVB teletext descriptor */
1593 {
1594 uint8_t *extradata = NULL;
1595 int language_count = desc_len / 5;
1596
1597 if (desc_len > 0 && desc_len % 5 != 0)
1598 return AVERROR_INVALIDDATA;
1599
1600 if (language_count > 0) {
1601 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1602 if (language_count > sizeof(language) / 4) {
1603 language_count = sizeof(language) / 4;
1604 }
1605
1606 if (st->codec->extradata == NULL) {
1607 if (ff_alloc_extradata(st->codec, language_count * 2)) {
1608 return AVERROR(ENOMEM);
1609 }
1610 }
1611
1612 if (st->codec->extradata_size < language_count * 2)
1613 return AVERROR_INVALIDDATA;
1614
1615 extradata = st->codec->extradata;
1616
1617 for (i = 0; i < language_count; i++) {
1618 language[i * 4 + 0] = get8(pp, desc_end);
1619 language[i * 4 + 1] = get8(pp, desc_end);
1620 language[i * 4 + 2] = get8(pp, desc_end);
1621 language[i * 4 + 3] = ',';
1622
1623 memcpy(extradata, *pp, 2);
1624 extradata += 2;
1625
1626 *pp += 2;
1627 }
1628
1629 language[i * 4 - 1] = 0;
1630 av_dict_set(&st->metadata, "language", language, 0);
1631 }
1632 }
1633 break;
1634 case 0x59: /* subtitling descriptor */
1635 {
1636 /* 8 bytes per DVB subtitle substream data:
1637 * ISO_639_language_code (3 bytes),
1638 * subtitling_type (1 byte),
1639 * composition_page_id (2 bytes),
1640 * ancillary_page_id (2 bytes) */
1641 int language_count = desc_len / 8;
1642
1643 if (desc_len > 0 && desc_len % 8 != 0)
1644 return AVERROR_INVALIDDATA;
1645
1646 if (language_count > 1) {
1647 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1648 }
1649
1650 if (language_count > 0) {
1651 uint8_t *extradata;
1652
1653 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1654 if (language_count > sizeof(language) / 4) {
1655 language_count = sizeof(language) / 4;
1656 }
1657
1658 if (st->codec->extradata == NULL) {
1659 if (ff_alloc_extradata(st->codec, language_count * 5)) {
1660 return AVERROR(ENOMEM);
1661 }
1662 }
1663
1664 if (st->codec->extradata_size < language_count * 5)
1665 return AVERROR_INVALIDDATA;
1666
1667 extradata = st->codec->extradata;
1668
1669 for (i = 0; i < language_count; i++) {
1670 language[i * 4 + 0] = get8(pp, desc_end);
1671 language[i * 4 + 1] = get8(pp, desc_end);
1672 language[i * 4 + 2] = get8(pp, desc_end);
1673 language[i * 4 + 3] = ',';
1674
1675 /* hearing impaired subtitles detection using subtitling_type */
1676 switch (*pp[0]) {
1677 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1678 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1679 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1680 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1681 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1682 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1683 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1684 break;
1685 }
1686
1687 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1688 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1689 extradata += 5;
1690
1691 *pp += 4;
1692 }
1693
1694 language[i * 4 - 1] = 0;
1695 av_dict_set(&st->metadata, "language", language, 0);
1696 }
1697 }
1698 break;
1699 case 0x0a: /* ISO 639 language descriptor */
1700 for (i = 0; i + 4 <= desc_len; i += 4) {
1701 language[i + 0] = get8(pp, desc_end);
1702 language[i + 1] = get8(pp, desc_end);
1703 language[i + 2] = get8(pp, desc_end);
1704 language[i + 3] = ',';
1705 switch (get8(pp, desc_end)) {
1706 case 0x01:
1707 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1708 break;
1709 case 0x02:
1710 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1711 break;
1712 case 0x03:
1713 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1714 break;
1715 }
1716 }
1717 if (i && language[0]) {
1718 language[i - 1] = 0;
1719 av_dict_set(&st->metadata, "language", language, 0);
1720 }
1721 break;
1722 case 0x05: /* registration descriptor */
1723 st->codec->codec_tag = bytestream_get_le32(pp);
1724 av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1725 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1726 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1727 break;
1728 case 0x52: /* stream identifier descriptor */
1729 st->stream_identifier = 1 + get8(pp, desc_end);
1730 break;
1731 case 0x26: /* metadata descriptor */
1732 if (get16(pp, desc_end) == 0xFFFF)
1733 *pp += 4;
1734 if (get8(pp, desc_end) == 0xFF) {
1735 st->codec->codec_tag = bytestream_get_le32(pp);
1736 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1737 mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types);
1738 }
1739 break;
f6fa7814
DM		 1740 case 0x7f: /* DVB extension descriptor */
1741 ext_desc_tag = get8(pp, desc_end);
1742 if (ext_desc_tag < 0)
1743 return AVERROR_INVALIDDATA;
1744 if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
1745 ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1746 if (!st->codec->extradata) {
1747 st->codec->extradata = av_mallocz(sizeof(opus_default_extradata) +
1748 FF_INPUT_BUFFER_PADDING_SIZE);
1749 if (!st->codec->extradata)
1750 return AVERROR(ENOMEM);
1751
1752 st->codec->extradata_size = sizeof(opus_default_extradata);
1753 memcpy(st->codec->extradata, opus_default_extradata, sizeof(opus_default_extradata));
1754
1755 channel_config_code = get8(pp, desc_end);
1756 if (channel_config_code < 0)
1757 return AVERROR_INVALIDDATA;
1758 if (channel_config_code <= 0x8) {
1759 st->codec->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1760 st->codec->extradata[18] = channels > 2;
1761 st->codec->extradata[19] = channel_config_code;
1762 if (channel_config_code == 0) { /* Dual Mono */
1763 st->codec->extradata[18] = 255; /* Mapping */
1764 st->codec->extradata[19] = 2; /* Stream Count */
1765 }
1766 st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1767 memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
1768 } else {
1769 avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1770 }
1771 st->need_parsing = AVSTREAM_PARSE_FULL;
1772 }
1773 }
1774 break;
2ba45a60
DM		 1775 default:
1776 break;
1777 }
1778 *pp = desc_end;
1779 return 0;
1780}
1781
1782static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1783{
1784 MpegTSContext *ts = filter->u.section_filter.opaque;
1785 SectionHeader h1, *h = &h1;
1786 PESContext *pes;
1787 AVStream *st;
1788 const uint8_t *p, *p_end, *desc_list_end;
1789 int program_info_length, pcr_pid, pid, stream_type;
1790 int desc_list_len;
1791 uint32_t prog_reg_desc = 0; /* registration descriptor */
1792
1793 int mp4_descr_count = 0;
1794 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1795 int i;
1796
1797 av_dlog(ts->stream, "PMT: len %i\n", section_len);
1798 hex_dump_debug(ts->stream, section, section_len);
1799
1800 p_end = section + section_len - 4;
1801 p = section;
1802 if (parse_section_header(h, &p, p_end) < 0)
1803 return;
1804
f6fa7814
DM		 1805 av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d version=%d\n",
1806 h->id, h->sec_num, h->last_sec_num, h->version);
2ba45a60
DM		 1807
1808 if (h->tid != PMT_TID)
1809 return;
f6fa7814 1810 if (!ts->scan_all_pmts && ts->skip_changes)
2ba45a60
DM		 1811 return;
1812
f6fa7814
DM		 1813 if (!ts->skip_clear)
1814 clear_program(ts, h->id);
1815
2ba45a60
DM		 1816 pcr_pid = get16(&p, p_end);
1817 if (pcr_pid < 0)
1818 return;
1819 pcr_pid &= 0x1fff;
1820 add_pid_to_pmt(ts, h->id, pcr_pid);
1821 set_pcr_pid(ts->stream, h->id, pcr_pid);
1822
1823 av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid);
1824
1825 program_info_length = get16(&p, p_end);
1826 if (program_info_length < 0)
1827 return;
1828 program_info_length &= 0xfff;
1829 while (program_info_length >= 2) {
1830 uint8_t tag, len;
1831 tag = get8(&p, p_end);
1832 len = get8(&p, p_end);
1833
1834 av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len);
1835
1836 if (len > program_info_length - 2)
1837 // something else is broken, exit the program_descriptors_loop
1838 break;
1839 program_info_length -= len + 2;
1840 if (tag == 0x1d) { // IOD descriptor
1841 get8(&p, p_end); // scope
1842 get8(&p, p_end); // label
1843 len -= 2;
1844 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1845 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1846 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1847 prog_reg_desc = bytestream_get_le32(&p);
1848 len -= 4;
1849 }
1850 p += len;
1851 }
1852 p += program_info_length;
1853 if (p >= p_end)
1854 goto out;
1855
1856 // stop parsing after pmt, we found header
1857 if (!ts->stream->nb_streams)
1858 ts->stop_parse = 2;
1859
1860 set_pmt_found(ts, h->id);
1861
1862
1863 for (;;) {
1864 st = 0;
1865 pes = NULL;
1866 stream_type = get8(&p, p_end);
1867 if (stream_type < 0)
1868 break;
1869 pid = get16(&p, p_end);
1870 if (pid < 0)
1871 goto out;
1872 pid &= 0x1fff;
1873 if (pid == ts->current_pid)
1874 goto out;
1875
1876 /* now create stream */
1877 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1878 pes = ts->pids[pid]->u.pes_filter.opaque;
1879 if (!pes->st) {
1880 pes->st = avformat_new_stream(pes->stream, NULL);
1881 if (!pes->st)
1882 goto out;
1883 pes->st->id = pes->pid;
1884 }
1885 st = pes->st;
1886 } else if (stream_type != 0x13) {
1887 if (ts->pids[pid])
1888 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1889 pes = add_pes_stream(ts, pid, pcr_pid);
1890 if (pes) {
1891 st = avformat_new_stream(pes->stream, NULL);
1892 if (!st)
1893 goto out;
1894 st->id = pes->pid;
1895 }
1896 } else {
1897 int idx = ff_find_stream_index(ts->stream, pid);
1898 if (idx >= 0) {
1899 st = ts->stream->streams[idx];
1900 } else {
1901 st = avformat_new_stream(ts->stream, NULL);
1902 if (!st)
1903 goto out;
1904 st->id = pid;
1905 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1906 }
1907 }
1908
1909 if (!st)
1910 goto out;
1911
1912 if (pes && !pes->stream_type)
1913 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1914
1915 add_pid_to_pmt(ts, h->id, pid);
1916
1917 ff_program_add_stream_index(ts->stream, h->id, st->index);
1918
1919 desc_list_len = get16(&p, p_end);
1920 if (desc_list_len < 0)
1921 goto out;
1922 desc_list_len &= 0xfff;
1923 desc_list_end = p + desc_list_len;
1924 if (desc_list_end > p_end)
1925 goto out;
1926 for (;;) {
1927 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1928 desc_list_end, mp4_descr,
1929 mp4_descr_count, pid, ts) < 0)
1930 break;
1931
1932 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1933 stream_type == 0x83 && pes->sub_st) {
1934 ff_program_add_stream_index(ts->stream, h->id,
1935 pes->sub_st->index);
1936 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1937 }
1938 }
1939 p = desc_list_end;
1940 }
1941
1942 if (!ts->pids[pcr_pid])
1943 mpegts_open_pcr_filter(ts, pcr_pid);
1944
1945out:
1946 for (i = 0; i < mp4_descr_count; i++)
1947 av_free(mp4_descr[i].dec_config_descr);
1948}
1949
1950static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1951{
1952 MpegTSContext *ts = filter->u.section_filter.opaque;
1953 SectionHeader h1, *h = &h1;
1954 const uint8_t *p, *p_end;
1955 int sid, pmt_pid;
1956 AVProgram *program;
1957
1958 av_dlog(ts->stream, "PAT:\n");
1959 hex_dump_debug(ts->stream, section, section_len);
1960
1961 p_end = section + section_len - 4;
1962 p = section;
1963 if (parse_section_header(h, &p, p_end) < 0)
1964 return;
1965 if (h->tid != PAT_TID)
1966 return;
1967 if (ts->skip_changes)
1968 return;
1969
1970 ts->stream->ts_id = h->id;
1971
1972 clear_programs(ts);
1973 for (;;) {
1974 sid = get16(&p, p_end);
1975 if (sid < 0)
1976 break;
1977 pmt_pid = get16(&p, p_end);
1978 if (pmt_pid < 0)
1979 break;
1980 pmt_pid &= 0x1fff;
1981
1982 if (pmt_pid == ts->current_pid)
1983 break;
1984
1985 av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1986
1987 if (sid == 0x0000) {
1988 /* NIT info */
1989 } else {
1990 MpegTSFilter *fil = ts->pids[pmt_pid];
1991 program = av_new_program(ts->stream, sid);
f6fa7814
DM		 1992 if (program) {
1993 program->program_num = sid;
1994 program->pmt_pid = pmt_pid;
1995 }
2ba45a60
DM		 1996 if (fil)
1997 if ( fil->type != MPEGTS_SECTION
1998 || fil->pid != pmt_pid
1999 || fil->u.section_filter.section_cb != pmt_cb)
2000 mpegts_close_filter(ts, ts->pids[pmt_pid]);
2001
2002 if (!ts->pids[pmt_pid])
2003 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2004 add_pat_entry(ts, sid);
2005 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
2006 add_pid_to_pmt(ts, sid, pmt_pid);
2007 }
2008 }
2009
2010 if (sid < 0) {
2011 int i,j;
2012 for (j=0; j<ts->stream->nb_programs; j++) {
2013 for (i = 0; i < ts->nb_prg; i++)
2014 if (ts->prg[i].id == ts->stream->programs[j]->id)
2015 break;
2016 if (i==ts->nb_prg && !ts->skip_clear)
2017 clear_avprogram(ts, ts->stream->programs[j]->id);
2018 }
2019 }
2020}
2021
2022static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2023{
2024 MpegTSContext *ts = filter->u.section_filter.opaque;
2025 SectionHeader h1, *h = &h1;
2026 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2027 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2028 char *name, *provider_name;
2029
2030 av_dlog(ts->stream, "SDT:\n");
2031 hex_dump_debug(ts->stream, section, section_len);
2032
2033 p_end = section + section_len - 4;
2034 p = section;
2035 if (parse_section_header(h, &p, p_end) < 0)
2036 return;
2037 if (h->tid != SDT_TID)
2038 return;
2039 if (ts->skip_changes)
2040 return;
2041 onid = get16(&p, p_end);
2042 if (onid < 0)
2043 return;
2044 val = get8(&p, p_end);
2045 if (val < 0)
2046 return;
2047 for (;;) {
2048 sid = get16(&p, p_end);
2049 if (sid < 0)
2050 break;
2051 val = get8(&p, p_end);
2052 if (val < 0)
2053 break;
2054 desc_list_len = get16(&p, p_end);
2055 if (desc_list_len < 0)
2056 break;
2057 desc_list_len &= 0xfff;
2058 desc_list_end = p + desc_list_len;
2059 if (desc_list_end > p_end)
2060 break;
2061 for (;;) {
2062 desc_tag = get8(&p, desc_list_end);
2063 if (desc_tag < 0)
2064 break;
2065 desc_len = get8(&p, desc_list_end);
2066 desc_end = p + desc_len;
2067 if (desc_len < 0 || desc_end > desc_list_end)
2068 break;
2069
2070 av_dlog(ts->stream, "tag: 0x%02x len=%d\n",
2071 desc_tag, desc_len);
2072
2073 switch (desc_tag) {
2074 case 0x48:
2075 service_type = get8(&p, p_end);
2076 if (service_type < 0)
2077 break;
2078 provider_name = getstr8(&p, p_end);
2079 if (!provider_name)
2080 break;
2081 name = getstr8(&p, p_end);
2082 if (name) {
2083 AVProgram *program = av_new_program(ts->stream, sid);
2084 if (program) {
2085 av_dict_set(&program->metadata, "service_name", name, 0);
2086 av_dict_set(&program->metadata, "service_provider",
2087 provider_name, 0);
2088 }
2089 }
2090 av_free(name);
2091 av_free(provider_name);
2092 break;
2093 default:
2094 break;
2095 }
2096 p = desc_end;
2097 }
2098 p = desc_list_end;
2099 }
2100}
2101
2102static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2103 const uint8_t *packet);
2104
2105/* handle one TS packet */
2106static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
2107{
2108 MpegTSFilter *tss;
2109 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2110 has_adaptation, has_payload;
2111 const uint8_t *p, *p_end;
2112 int64_t pos;
2113
2114 pid = AV_RB16(packet + 1) & 0x1fff;
2115 if (pid && discard_pid(ts, pid))
2116 return 0;
2117 is_start = packet[1] & 0x40;
2118 tss = ts->pids[pid];
2119 if (ts->auto_guess && !tss && is_start) {
2120 add_pes_stream(ts, pid, -1);
2121 tss = ts->pids[pid];
2122 }
2123 if (!tss)
2124 return 0;
2125 ts->current_pid = pid;
2126
2127 afc = (packet[3] >> 4) & 3;
2128 if (afc == 0) /* reserved value */
2129 return 0;
2130 has_adaptation = afc & 2;
2131 has_payload = afc & 1;
2132 is_discontinuity = has_adaptation &&
2133 packet[4] != 0 && /* with length > 0 */
2134 (packet[5] & 0x80); /* and discontinuity indicated */
2135
2136 /* continuity check (currently not used) */
2137 cc = (packet[3] & 0xf);
2138 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2139 cc_ok = pid == 0x1FFF || // null packet PID
2140 is_discontinuity ||
2141 tss->last_cc < 0 ||
2142 expected_cc == cc;
2143
2144 tss->last_cc = cc;
2145 if (!cc_ok) {
2146 av_log(ts->stream, AV_LOG_DEBUG,
2147 "Continuity check failed for pid %d expected %d got %d\n",
2148 pid, expected_cc, cc);
2149 if (tss->type == MPEGTS_PES) {
2150 PESContext *pc = tss->u.pes_filter.opaque;
2151 pc->flags |= AV_PKT_FLAG_CORRUPT;
2152 }
2153 }
2154
2155 p = packet + 4;
2156 if (has_adaptation) {
2157 int64_t pcr_h;
2158 int pcr_l;
2159 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2160 tss->last_pcr = pcr_h * 300 + pcr_l;
2161 /* skip adaptation field */
2162 p += p[0] + 1;
2163 }
2164 /* if past the end of packet, ignore */
2165 p_end = packet + TS_PACKET_SIZE;
2166 if (p >= p_end || !has_payload)
2167 return 0;
2168
2169 pos = avio_tell(ts->stream->pb);
2170 if (pos >= 0) {
2171 av_assert0(pos >= TS_PACKET_SIZE);
2172 ts->pos47_full = pos - TS_PACKET_SIZE;
2173 }
2174
2175 if (tss->type == MPEGTS_SECTION) {
2176 if (is_start) {
2177 /* pointer field present */
2178 len = *p++;
2179 if (p + len > p_end)
2180 return 0;
2181 if (len && cc_ok) {
2182 /* write remaining section bytes */
2183 write_section_data(ts, tss,
2184 p, len, 0);
2185 /* check whether filter has been closed */
2186 if (!ts->pids[pid])
2187 return 0;
2188 }
2189 p += len;
2190 if (p < p_end) {
2191 write_section_data(ts, tss,
2192 p, p_end - p, 1);
2193 }
2194 } else {
2195 if (cc_ok) {
2196 write_section_data(ts, tss,
2197 p, p_end - p, 0);
2198 }
2199 }
2200
2201 // stop find_stream_info from waiting for more streams
2202 // when all programs have received a PMT
f6fa7814 2203 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2ba45a60
DM		 2204 int i;
2205 for (i = 0; i < ts->nb_prg; i++) {
2206 if (!ts->prg[i].pmt_found)
2207 break;
2208 }
2209 if (i == ts->nb_prg && ts->nb_prg > 0) {
f6fa7814
DM		 2210 int types = 0;
2211 for (i = 0; i < ts->stream->nb_streams; i++) {
2212 AVStream *st = ts->stream->streams[i];
2213 types |= 1<<st->codec->codec_type;
2214 }
2215 if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2ba45a60
DM		 2216 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2217 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2218 }
2219 }
2220 }
2221
2222 } else {
2223 int ret;
2224 // Note: The position here points actually behind the current packet.
2225 if (tss->type == MPEGTS_PES) {
2226 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2227 pos - ts->raw_packet_size)) < 0)
2228 return ret;
2229 }
2230 }
2231
2232 return 0;
2233}
2234
2235static void reanalyze(MpegTSContext *ts) {
2236 AVIOContext *pb = ts->stream->pb;
2237 int64_t pos = avio_tell(pb);
2238 if (pos < 0)
2239 return;
2240 pos -= ts->pos47_full;
2241 if (pos == TS_PACKET_SIZE) {
2242 ts->size_stat[0] ++;
2243 } else if (pos == TS_DVHS_PACKET_SIZE) {
2244 ts->size_stat[1] ++;
2245 } else if (pos == TS_FEC_PACKET_SIZE) {
2246 ts->size_stat[2] ++;
2247 }
2248
2249 ts->size_stat_count ++;
2250 if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
2251 int newsize = 0;
2252 if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
2253 newsize = TS_PACKET_SIZE;
2254 } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
2255 newsize = TS_DVHS_PACKET_SIZE;
2256 } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
2257 newsize = TS_FEC_PACKET_SIZE;
2258 }
2259 if (newsize && newsize != ts->raw_packet_size) {
2260 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
2261 ts->raw_packet_size = newsize;
2262 }
2263 ts->size_stat_count = 0;
2264 memset(ts->size_stat, 0, sizeof(ts->size_stat));
2265 }
2266}
2267
2268/* XXX: try to find a better synchro over several packets (use
2269 * get_packet_size() ?) */
2270static int mpegts_resync(AVFormatContext *s)
2271{
2272 MpegTSContext *ts = s->priv_data;
2273 AVIOContext *pb = s->pb;
2274 int c, i;
2275
2276 for (i = 0; i < ts->resync_size; i++) {
2277 c = avio_r8(pb);
2278 if (avio_feof(pb))
2279 return AVERROR_EOF;
2280 if (c == 0x47) {
2281 avio_seek(pb, -1, SEEK_CUR);
2282 reanalyze(s->priv_data);
2283 return 0;
2284 }
2285 }
2286 av_log(s, AV_LOG_ERROR,
2287 "max resync size reached, could not find sync byte\n");
2288 /* no sync found */
2289 return AVERROR_INVALIDDATA;
2290}
2291
2292/* return AVERROR_something if error or EOF. Return 0 if OK. */
2293static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2294 const uint8_t **data)
2295{
2296 AVIOContext *pb = s->pb;
2297 int len;
2298
2299 for (;;) {
2300 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2301 if (len != TS_PACKET_SIZE)
2302 return len < 0 ? len : AVERROR_EOF;
2303 /* check packet sync byte */
2304 if ((*data)[0] != 0x47) {
2305 /* find a new packet start */
2306 uint64_t pos = avio_tell(pb);
2307 avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
2308
2309 if (mpegts_resync(s) < 0)
2310 return AVERROR(EAGAIN);
2311 else
2312 continue;
2313 } else {
2314 break;
2315 }
2316 }
2317 return 0;
2318}
2319
2320static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2321{
2322 AVIOContext *pb = s->pb;
2323 int skip = raw_packet_size - TS_PACKET_SIZE;
2324 if (skip > 0)
2325 avio_skip(pb, skip);
2326}
2327
2328static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2329{
2330 AVFormatContext *s = ts->stream;
2331 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
2332 const uint8_t *data;
2333 int64_t packet_num;
2334 int ret = 0;
2335
2336 if (avio_tell(s->pb) != ts->last_pos) {
2337 int i;
2338 av_dlog(ts->stream, "Skipping after seek\n");
2339 /* seek detected, flush pes buffer */
2340 for (i = 0; i < NB_PID_MAX; i++) {
2341 if (ts->pids[i]) {
2342 if (ts->pids[i]->type == MPEGTS_PES) {
2343 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2344 av_buffer_unref(&pes->buffer);
2345 pes->data_index = 0;
2346 pes->state = MPEGTS_SKIP; /* skip until pes header */
2347 }
2348 ts->pids[i]->last_cc = -1;
2349 ts->pids[i]->last_pcr = -1;
2350 }
2351 }
2352 }
2353
2354 ts->stop_parse = 0;
2355 packet_num = 0;
2356 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
2357 for (;;) {
2358 packet_num++;
2359 if (nb_packets != 0 && packet_num >= nb_packets ||
2360 ts->stop_parse > 1) {
2361 ret = AVERROR(EAGAIN);
2362 break;
2363 }
2364 if (ts->stop_parse > 0)
2365 break;
2366
2367 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2368 if (ret != 0)
2369 break;
2370 ret = handle_packet(ts, data);
2371 finished_reading_packet(s, ts->raw_packet_size);
2372 if (ret != 0)
2373 break;
2374 }
2375 ts->last_pos = avio_tell(s->pb);
2376 return ret;
2377}
2378
2379static int mpegts_probe(AVProbeData *p)
2380{
2381 const int size = p->buf_size;
2382 int maxscore = 0;
2383 int sumscore = 0;
2384 int i;
2385 int check_count = size / TS_FEC_PACKET_SIZE;
2386#define CHECK_COUNT 10
2387#define CHECK_BLOCK 100
2388
2389 if (check_count < CHECK_COUNT)
2390 return AVERROR_INVALIDDATA;
2391
2392 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
2393 int left = FFMIN(check_count - i, CHECK_BLOCK);
2394 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL);
2395 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL);
2396 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL);
2397 score = FFMAX3(score, dvhs_score, fec_score);
2398 sumscore += score;
2399 maxscore = FFMAX(maxscore, score);
2400 }
2401
2402 sumscore = sumscore * CHECK_COUNT / check_count;
2403 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
2404
2405 av_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
2406
2407 if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
2408 else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
2409 else
2410 return AVERROR_INVALIDDATA;
2411}
2412
2413/* return the 90kHz PCR and the extension for the 27MHz PCR. return
2414 * (-1) if not available */
2415static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2416{
2417 int afc, len, flags;
2418 const uint8_t *p;
2419 unsigned int v;
2420
2421 afc = (packet[3] >> 4) & 3;
2422 if (afc <= 1)
2423 return AVERROR_INVALIDDATA;
2424 p = packet + 4;
2425 len = p[0];
2426 p++;
2427 if (len == 0)
2428 return AVERROR_INVALIDDATA;
2429 flags = *p++;
2430 len--;
2431 if (!(flags & 0x10))
2432 return AVERROR_INVALIDDATA;
2433 if (len < 6)
2434 return AVERROR_INVALIDDATA;
2435 v = AV_RB32(p);
2436 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2437 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2438 return 0;
2439}
2440
2441static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
2442
2443 /* NOTE: We attempt to seek on non-seekable files as well, as the
2444 * probe buffer usually is big enough. Only warn if the seek failed
2445 * on files where the seek should work. */
2446 if (avio_seek(pb, pos, SEEK_SET) < 0)
2447 av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
2448}
2449
2450static int mpegts_read_header(AVFormatContext *s)
2451{
2452 MpegTSContext *ts = s->priv_data;
2453 AVIOContext *pb = s->pb;
2454 uint8_t buf[8 * 1024] = {0};
2455 int len;
2456 int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2;
2457
2458 ffio_ensure_seekback(pb, probesize);
2459
2460 /* read the first 8192 bytes to get packet size */
2461 pos = avio_tell(pb);
2462 len = avio_read(pb, buf, sizeof(buf));
2463 ts->raw_packet_size = get_packet_size(buf, len);
2464 if (ts->raw_packet_size <= 0) {
2465 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
2466 ts->raw_packet_size = TS_PACKET_SIZE;
2467 }
2468 ts->stream = s;
2469 ts->auto_guess = 0;
2470
2471 if (s->iformat == &ff_mpegts_demuxer) {
2472 /* normal demux */
2473
2474 /* first do a scan to get all the services */
2475 seek_back(s, pb, pos);
2476
2477 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2478
2479 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2480
2481 handle_packets(ts, probesize / ts->raw_packet_size);
2482 /* if could not find service, enable auto_guess */
2483
2484 ts->auto_guess = 1;
2485
2486 av_dlog(ts->stream, "tuning done\n");
2487
2488 s->ctx_flags |= AVFMTCTX_NOHEADER;
2489 } else {
2490 AVStream *st;
2491 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2492 int64_t pcrs[2], pcr_h;
2493 int packet_count[2];
2494 uint8_t packet[TS_PACKET_SIZE];
2495 const uint8_t *data;
2496
2497 /* only read packets */
2498
2499 st = avformat_new_stream(s, NULL);
2500 if (!st)
2501 return AVERROR(ENOMEM);
2502 avpriv_set_pts_info(st, 60, 1, 27000000);
2503 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2504 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2505
2506 /* we iterate until we find two PCRs to estimate the bitrate */
2507 pcr_pid = -1;
2508 nb_pcrs = 0;
2509 nb_packets = 0;
2510 for (;;) {
2511 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2512 if (ret < 0)
2513 return ret;
2514 pid = AV_RB16(data + 1) & 0x1fff;
2515 if ((pcr_pid == -1 || pcr_pid == pid) &&
2516 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2517 finished_reading_packet(s, ts->raw_packet_size);
2518 pcr_pid = pid;
2519 packet_count[nb_pcrs] = nb_packets;
2520 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2521 nb_pcrs++;
2522 if (nb_pcrs >= 2)
2523 break;
2524 } else {
2525 finished_reading_packet(s, ts->raw_packet_size);
2526 }
2527 nb_packets++;
2528 }
2529
2530 /* NOTE1: the bitrate is computed without the FEC */
2531 /* NOTE2: it is only the bitrate of the start of the stream */
2532 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2533 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2534 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2535 st->codec->bit_rate = s->bit_rate;
2536 st->start_time = ts->cur_pcr;
2537 av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n",
2538 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2539 }
2540
2541 seek_back(s, pb, pos);
2542 return 0;
2543}
2544
2545#define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2546
2547static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2548{
2549 MpegTSContext *ts = s->priv_data;
2550 int ret, i;
2551 int64_t pcr_h, next_pcr_h, pos;
2552 int pcr_l, next_pcr_l;
2553 uint8_t pcr_buf[12];
2554 const uint8_t *data;
2555
2556 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2557 return AVERROR(ENOMEM);
2558 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2559 pkt->pos = avio_tell(s->pb);
2560 if (ret < 0) {
2561 av_free_packet(pkt);
2562 return ret;
2563 }
2564 if (data != pkt->data)
2565 memcpy(pkt->data, data, ts->raw_packet_size);
2566 finished_reading_packet(s, ts->raw_packet_size);
2567 if (ts->mpeg2ts_compute_pcr) {
2568 /* compute exact PCR for each packet */
2569 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2570 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2571 pos = avio_tell(s->pb);
2572 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2573 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2574 avio_read(s->pb, pcr_buf, 12);
2575 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2576 /* XXX: not precise enough */
2577 ts->pcr_incr =
2578 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2579 (i + 1);
2580 break;
2581 }
2582 }
2583 avio_seek(s->pb, pos, SEEK_SET);
2584 /* no next PCR found: we use previous increment */
2585 ts->cur_pcr = pcr_h * 300 + pcr_l;
2586 }
2587 pkt->pts = ts->cur_pcr;
2588 pkt->duration = ts->pcr_incr;
2589 ts->cur_pcr += ts->pcr_incr;
2590 }
2591 pkt->stream_index = 0;
2592 return 0;
2593}
2594
2595static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2596{
2597 MpegTSContext *ts = s->priv_data;
2598 int ret, i;
2599
2600 pkt->size = -1;
2601 ts->pkt = pkt;
2602 ret = handle_packets(ts, 0);
2603 if (ret < 0) {
2604 av_free_packet(ts->pkt);
2605 /* flush pes data left */
2606 for (i = 0; i < NB_PID_MAX; i++)
2607 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2608 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2609 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2610 new_pes_packet(pes, pkt);
2611 pes->state = MPEGTS_SKIP;
2612 ret = 0;
2613 break;
2614 }
2615 }
2616 }
2617
2618 if (!ret && pkt->size < 0)
2619 ret = AVERROR(EINTR);
2620 return ret;
2621}
2622
2623static void mpegts_free(MpegTSContext *ts)
2624{
2625 int i;
2626
2627 clear_programs(ts);
2628
2629 for (i = 0; i < NB_PID_MAX; i++)
2630 if (ts->pids[i])
2631 mpegts_close_filter(ts, ts->pids[i]);
2632}
2633
2634static int mpegts_read_close(AVFormatContext *s)
2635{
2636 MpegTSContext *ts = s->priv_data;
2637 mpegts_free(ts);
2638 return 0;
2639}
2640
2641static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2642 int64_t *ppos, int64_t pos_limit)
2643{
2644 MpegTSContext *ts = s->priv_data;
2645 int64_t pos, timestamp;
2646 uint8_t buf[TS_PACKET_SIZE];
2647 int pcr_l, pcr_pid =
2648 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2649 int pos47 = ts->pos47_full % ts->raw_packet_size;
2650 pos =
2651 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
2652 ts->raw_packet_size + pos47;
2653 while(pos < pos_limit) {
2654 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2655 return AV_NOPTS_VALUE;
2656 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2657 return AV_NOPTS_VALUE;
2658 if (buf[0] != 0x47) {
2659 avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
2660 if (mpegts_resync(s) < 0)
2661 return AV_NOPTS_VALUE;
2662 pos = avio_tell(s->pb);
2663 continue;
2664 }
2665 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2666 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2667 *ppos = pos;
2668 return timestamp;
2669 }
2670 pos += ts->raw_packet_size;
2671 }
2672
2673 return AV_NOPTS_VALUE;
2674}
2675
2676static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
2677 int64_t *ppos, int64_t pos_limit)
2678{
2679 MpegTSContext *ts = s->priv_data;
2680 int64_t pos;
2681 int pos47 = ts->pos47_full % ts->raw_packet_size;
2682 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
2683 ff_read_frame_flush(s);
2684 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
2685 return AV_NOPTS_VALUE;
2686 while(pos < pos_limit) {
2687 int ret;
2688 AVPacket pkt;
2689 av_init_packet(&pkt);
2690 ret = av_read_frame(s, &pkt);
2691 if (ret < 0)
2692 return AV_NOPTS_VALUE;
2693 av_free_packet(&pkt);
2694 if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
2695 ff_reduce_index(s, pkt.stream_index);
2696 av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
2697 if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
2698 *ppos = pkt.pos;
2699 return pkt.dts;
2700 }
2701 }
2702 pos = pkt.pos;
2703 }
2704
2705 return AV_NOPTS_VALUE;
2706}
2707
2708/**************************************************************/
2709/* parsing functions - called from other demuxers such as RTP */
2710
2711MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
2712{
2713 MpegTSContext *ts;
2714
2715 ts = av_mallocz(sizeof(MpegTSContext));
2716 if (!ts)
2717 return NULL;
2718 /* no stream case, currently used by RTP */
2719 ts->raw_packet_size = TS_PACKET_SIZE;
2720 ts->stream = s;
2721 ts->auto_guess = 1;
2722 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2723 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2724
2725 return ts;
2726}
2727
2728/* return the consumed length if a packet was output, or -1 if no
2729 * packet is output */
2730int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2731 const uint8_t *buf, int len)
2732{
2733 int len1;
2734
2735 len1 = len;
2736 ts->pkt = pkt;
2737 for (;;) {
2738 ts->stop_parse = 0;
2739 if (len < TS_PACKET_SIZE)
2740 return AVERROR_INVALIDDATA;
2741 if (buf[0] != 0x47) {
2742 buf++;
2743 len--;
2744 } else {
2745 handle_packet(ts, buf);
2746 buf += TS_PACKET_SIZE;
2747 len -= TS_PACKET_SIZE;
2748 if (ts->stop_parse == 1)
2749 break;
2750 }
2751 }
2752 return len1 - len;
2753}
2754
2755void avpriv_mpegts_parse_close(MpegTSContext *ts)
2756{
2757 mpegts_free(ts);
2758 av_free(ts);
2759}
2760
2761AVInputFormat ff_mpegts_demuxer = {
2762 .name = "mpegts",
2763 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2764 .priv_data_size = sizeof(MpegTSContext),
2765 .read_probe = mpegts_probe,
2766 .read_header = mpegts_read_header,
2767 .read_packet = mpegts_read_packet,
2768 .read_close = mpegts_read_close,
2769 .read_timestamp = mpegts_get_dts,
2770 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2771 .priv_class = &mpegts_class,
2772};
2773
2774AVInputFormat ff_mpegtsraw_demuxer = {
2775 .name = "mpegtsraw",
2776 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2777 .priv_data_size = sizeof(MpegTSContext),
2778 .read_header = mpegts_read_header,
2779 .read_packet = mpegts_raw_read_packet,
2780 .read_close = mpegts_read_close,
2781 .read_timestamp = mpegts_get_dts,
2782 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2783 .priv_class = &mpegtsraw_class,
2784};
ffmpeg Piment Noir Debian package repository