1 /*
2 * MPEG-2 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/common.h"
24 #include "libavutil/crc.h"
25 #include "libavutil/internal.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/log.h"
28 #include "libavutil/dict.h"
29 #include "libavutil/mathematics.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/avassert.h"
32 #include "libavutil/dovi_meta.h"
33 #include "libavcodec/bytestream.h"
34 #include "libavcodec/get_bits.h"
35 #include "libavcodec/opus.h"
36 #include "avformat.h"
37 #include "mpegts.h"
38 #include "internal.h"
39 #include "avio_internal.h"
40 #include "mpeg.h"
41 #include "isom.h"
42 #if CONFIG_ICONV
43 #include <iconv.h>
44 #endif
45
46 /* maximum size in which we look for synchronization if
47 * synchronization is lost */
48 #define MAX_RESYNC_SIZE 65536
49
50 #define MAX_PES_PAYLOAD 200 * 1024
51
52 #define MAX_MP4_DESCR_COUNT 16
53
54 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
55 do { \
56 if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
57 (modulus) = (dividend) % (divisor); \
58 (prev_dividend) = (dividend); \
59 } while (0)
60
61 #define PROBE_PACKET_MAX_BUF 8192
62 #define PROBE_PACKET_MARGIN 5
63
64 enum MpegTSFilterType {
65 MPEGTS_PES,
66 MPEGTS_SECTION,
67 MPEGTS_PCR,
68 };
69
70 typedef struct MpegTSFilter MpegTSFilter;
71
72 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
73 int is_start, int64_t pos);
74
75 typedef struct MpegTSPESFilter {
76 PESCallback *pes_cb;
77 void *opaque;
78 } MpegTSPESFilter;
79
80 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
81
82 typedef void SetServiceCallback (void *opaque, int ret);
83
84 typedef struct MpegTSSectionFilter {
85 int section_index;
86 int section_h_size;
87 int last_ver;
88 unsigned crc;
89 unsigned last_crc;
90 uint8_t *section_buf;
91 unsigned int check_crc : 1;
92 unsigned int end_of_section_reached : 1;
93 SectionCallback *section_cb;
94 void *opaque;
95 } MpegTSSectionFilter;
96
97 struct MpegTSFilter {
98 int pid;
99 int es_id;
100 int last_cc; /* last cc code (-1 if first packet) */
101 int64_t last_pcr;
102 int discard;
103 enum MpegTSFilterType type;
104 union {
105 MpegTSPESFilter pes_filter;
106 MpegTSSectionFilter section_filter;
107 } u;
108 };
109
110 struct Stream {
111 int idx;
112 int stream_identifier;
113 };
114
115 #define MAX_STREAMS_PER_PROGRAM 128
116 #define MAX_PIDS_PER_PROGRAM (MAX_STREAMS_PER_PROGRAM + 2)
117 struct Program {
118 unsigned int id; // program id/service id
119 unsigned int nb_pids;
120 unsigned int pids[MAX_PIDS_PER_PROGRAM];
121 unsigned int nb_streams;
122 struct Stream streams[MAX_STREAMS_PER_PROGRAM];
123
124 /** have we found pmt for this program */
125 int pmt_found;
126 };
127
128 struct MpegTSContext {
129 const AVClass *class;
130 /* user data */
131 AVFormatContext *stream;
132 /** raw packet size, including FEC if present */
133 int raw_packet_size;
134
135 int64_t pos47_full;
136
137 /** if true, all pids are analyzed to find streams */
138 int auto_guess;
139
140 /** compute exact PCR for each transport stream packet */
141 int mpeg2ts_compute_pcr;
142
143 /** fix dvb teletext pts */
144 int fix_teletext_pts;
145
146 int64_t cur_pcr; /**< used to estimate the exact PCR */
147 int64_t pcr_incr; /**< used to estimate the exact PCR */
148
149 /* data needed to handle file based ts */
150 /** stop parsing loop */
151 int stop_parse;
152 /** packet containing Audio/Video data */
153 AVPacket *pkt;
154 /** to detect seek */
155 int64_t last_pos;
156
157 int skip_changes;
158 int skip_clear;
159 int skip_unknown_pmt;
160
161 int scan_all_pmts;
162
163 int resync_size;
164 int merge_pmt_versions;
165
166 /******************************************/
167 /* private mpegts data */
168 /* scan context */
169 /** structure to keep track of Program->pids mapping */
170 unsigned int nb_prg;
171 struct Program *prg;
172
173 int8_t crc_validity[NB_PID_MAX];
174 /** filters for various streams specified by PMT + for the PAT and PMT */
175 MpegTSFilter *pids[NB_PID_MAX];
176 int current_pid;
177
178 AVStream *epg_stream;
179 AVBufferPool* pools[32];
180 };
181
182 #define MPEGTS_OPTIONS \
183 { "resync_size", "set 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 }
184
185 static const AVOption options[] = {
186 MPEGTS_OPTIONS,
187 {"fix_teletext_pts", "try to fix pts values of dvb teletext streams", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_BOOL,
188 {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
189 {"ts_packetsize", "output option carrying the raw packet size", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
190 {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
191 {"scan_all_pmts", "scan and combine all PMTs", offsetof(MpegTSContext, scan_all_pmts), AV_OPT_TYPE_BOOL,
192 {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM },
193 {"skip_unknown_pmt", "skip PMTs for programs not advertised in the PAT", offsetof(MpegTSContext, skip_unknown_pmt), AV_OPT_TYPE_BOOL,
194 {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
195 {"merge_pmt_versions", "re-use streams when PMT's version/pids change", offsetof(MpegTSContext, merge_pmt_versions), AV_OPT_TYPE_BOOL,
196 {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
197 {"skip_changes", "skip changing / adding streams / programs", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_BOOL,
198 {.i64 = 0}, 0, 1, 0 },
199 {"skip_clear", "skip clearing programs", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_BOOL,
200 {.i64 = 0}, 0, 1, 0 },
201 { NULL },
202 };
203
204 static const AVClass mpegts_class = {
205 .class_name = "mpegts demuxer",
206 .item_name = av_default_item_name,
207 .option = options,
208 .version = LIBAVUTIL_VERSION_INT,
209 };
210
211 static const AVOption raw_options[] = {
212 MPEGTS_OPTIONS,
213 { "compute_pcr", "compute exact PCR for each transport stream packet",
214 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_BOOL,
215 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
216 { "ts_packetsize", "output option carrying the raw packet size",
217 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
218 { .i64 = 0 }, 0, 0,
219 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
220 { NULL },
221 };
222
223 static const AVClass mpegtsraw_class = {
224 .class_name = "mpegtsraw demuxer",
225 .item_name = av_default_item_name,
226 .option = raw_options,
227 .version = LIBAVUTIL_VERSION_INT,
228 };
229
230 /* TS stream handling */
231
232 enum MpegTSState {
233 MPEGTS_HEADER = 0,
234 MPEGTS_PESHEADER,
235 MPEGTS_PESHEADER_FILL,
236 MPEGTS_PAYLOAD,
237 MPEGTS_SKIP,
238 };
239
240 /* enough for PES header + length */
241 #define PES_START_SIZE 6
242 #define PES_HEADER_SIZE 9
243 #define MAX_PES_HEADER_SIZE (9 + 255)
244
245 typedef struct PESContext {
246 int pid;
247 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
248 int stream_type;
249 MpegTSContext *ts;
250 AVFormatContext *stream;
251 AVStream *st;
252 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
253 enum MpegTSState state;
254 /* used to get the format */
255 int data_index;
256 int flags; /**< copied to the AVPacket flags */
257 int total_size;
258 int pes_header_size;
259 int extended_stream_id;
260 uint8_t stream_id;
261 int64_t pts, dts;
262 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
263 uint8_t header[MAX_PES_HEADER_SIZE];
264 AVBufferRef *buffer;
265 SLConfigDescr sl;
266 int merged_st;
267 } PESContext;
268
269 extern AVInputFormat ff_mpegts_demuxer;
270
get_program(MpegTSContext * ts,unsigned int programid)271 static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
272 {
273 int i;
274 for (i = 0; i < ts->nb_prg; i++) {
275 if (ts->prg[i].id == programid) {
276 return &ts->prg[i];
277 }
278 }
279 return NULL;
280 }
281
clear_avprogram(MpegTSContext * ts,unsigned int programid)282 static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
283 {
284 AVProgram *prg = NULL;
285 int i;
286
287 for (i = 0; i < ts->stream->nb_programs; i++)
288 if (ts->stream->programs[i]->id == programid) {
289 prg = ts->stream->programs[i];
290 break;
291 }
292 if (!prg)
293 return;
294 prg->nb_stream_indexes = 0;
295 }
296
clear_program(struct Program * p)297 static void clear_program(struct Program *p)
298 {
299 if (!p)
300 return;
301 p->nb_pids = 0;
302 p->nb_streams = 0;
303 p->pmt_found = 0;
304 }
305
clear_programs(MpegTSContext * ts)306 static void clear_programs(MpegTSContext *ts)
307 {
308 av_freep(&ts->prg);
309 ts->nb_prg = 0;
310 }
311
add_program(MpegTSContext * ts,unsigned int programid)312 static struct Program * add_program(MpegTSContext *ts, unsigned int programid)
313 {
314 struct Program *p = get_program(ts, programid);
315 if (p)
316 return p;
317 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
318 ts->nb_prg = 0;
319 return NULL;
320 }
321 p = &ts->prg[ts->nb_prg];
322 p->id = programid;
323 clear_program(p);
324 ts->nb_prg++;
325 return p;
326 }
327
add_pid_to_program(struct Program * p,unsigned int pid)328 static void add_pid_to_program(struct Program *p, unsigned int pid)
329 {
330 int i;
331 if (!p)
332 return;
333
334 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
335 return;
336
337 for (i = 0; i < p->nb_pids; i++)
338 if (p->pids[i] == pid)
339 return;
340
341 p->pids[p->nb_pids++] = pid;
342 }
343
update_av_program_info(AVFormatContext * s,unsigned int programid,unsigned int pid,int version)344 static void update_av_program_info(AVFormatContext *s, unsigned int programid,
345 unsigned int pid, int version)
346 {
347 int i;
348 for (i = 0; i < s->nb_programs; i++) {
349 AVProgram *program = s->programs[i];
350 if (program->id == programid) {
351 int old_pcr_pid = program->pcr_pid,
352 old_version = program->pmt_version;
353 program->pcr_pid = pid;
354 program->pmt_version = version;
355
356 if (old_version != -1 && old_version != version) {
357 av_log(s, AV_LOG_VERBOSE,
358 "detected PMT change (program=%d, version=%d/%d, pcr_pid=0x%x/0x%x)\n",
359 programid, old_version, version, old_pcr_pid, pid);
360 }
361 break;
362 }
363 }
364 }
365
366 /**
367 * @brief discard_pid() decides if the pid is to be discarded according
368 * to caller's programs selection
369 * @param ts : - TS context
370 * @param pid : - pid
371 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
372 * 0 otherwise
373 */
discard_pid(MpegTSContext * ts,unsigned int pid)374 static int discard_pid(MpegTSContext *ts, unsigned int pid)
375 {
376 int i, j, k;
377 int used = 0, discarded = 0;
378 struct Program *p;
379
380 if (pid == PAT_PID)
381 return 0;
382
383 /* If none of the programs have .discard=AVDISCARD_ALL then there's
384 * no way we have to discard this packet */
385 for (k = 0; k < ts->stream->nb_programs; k++)
386 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
387 break;
388 if (k == ts->stream->nb_programs)
389 return 0;
390
391 for (i = 0; i < ts->nb_prg; i++) {
392 p = &ts->prg[i];
393 for (j = 0; j < p->nb_pids; j++) {
394 if (p->pids[j] != pid)
395 continue;
396 // is program with id p->id set to be discarded?
397 for (k = 0; k < ts->stream->nb_programs; k++) {
398 if (ts->stream->programs[k]->id == p->id) {
399 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
400 discarded++;
401 else
402 used++;
403 }
404 }
405 }
406 }
407
408 return !used && discarded;
409 }
410
411 /**
412 * Assemble PES packets out of TS packets, and then call the "section_cb"
413 * function when they are complete.
414 */
write_section_data(MpegTSContext * ts,MpegTSFilter * tss1,const uint8_t * buf,int buf_size,int is_start)415 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
416 const uint8_t *buf, int buf_size, int is_start)
417 {
418 MpegTSSectionFilter *tss = &tss1->u.section_filter;
419 uint8_t *cur_section_buf = NULL;
420 int len, offset;
421
422 if (is_start) {
423 memcpy(tss->section_buf, buf, buf_size);
424 tss->section_index = buf_size;
425 tss->section_h_size = -1;
426 tss->end_of_section_reached = 0;
427 } else {
428 if (tss->end_of_section_reached)
429 return;
430 len = MAX_SECTION_SIZE - tss->section_index;
431 if (buf_size < len)
432 len = buf_size;
433 memcpy(tss->section_buf + tss->section_index, buf, len);
434 tss->section_index += len;
435 }
436
437 offset = 0;
438 cur_section_buf = tss->section_buf;
439 while (cur_section_buf - tss->section_buf < MAX_SECTION_SIZE && cur_section_buf[0] != 0xff) {
440 /* compute section length if possible */
441 if (tss->section_h_size == -1 && tss->section_index - offset >= 3) {
442 len = (AV_RB16(cur_section_buf + 1) & 0xfff) + 3;
443 if (len > MAX_SECTION_SIZE)
444 return;
445 tss->section_h_size = len;
446 }
447
448 if (tss->section_h_size != -1 &&
449 tss->section_index >= offset + tss->section_h_size) {
450 int crc_valid = 1;
451 tss->end_of_section_reached = 1;
452
453 if (tss->check_crc) {
454 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, cur_section_buf, tss->section_h_size);
455 if (tss->section_h_size >= 4)
456 tss->crc = AV_RB32(cur_section_buf + tss->section_h_size - 4);
457
458 if (crc_valid) {
459 ts->crc_validity[ tss1->pid ] = 100;
460 }else if (ts->crc_validity[ tss1->pid ] > -10) {
461 ts->crc_validity[ tss1->pid ]--;
462 }else
463 crc_valid = 2;
464 }
465 if (crc_valid) {
466 tss->section_cb(tss1, cur_section_buf, tss->section_h_size);
467 if (crc_valid != 1)
468 tss->last_ver = -1;
469 }
470
471 cur_section_buf += tss->section_h_size;
472 offset += tss->section_h_size;
473 tss->section_h_size = -1;
474 } else {
475 tss->section_h_size = -1;
476 tss->end_of_section_reached = 0;
477 break;
478 }
479 }
480 }
481
mpegts_open_filter(MpegTSContext * ts,unsigned int pid,enum MpegTSFilterType type)482 static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
483 enum MpegTSFilterType type)
484 {
485 MpegTSFilter *filter;
486
487 av_log(ts->stream, AV_LOG_TRACE, "Filter: pid=0x%x type=%d\n", pid, type);
488
489 if (pid >= NB_PID_MAX || ts->pids[pid])
490 return NULL;
491 filter = av_mallocz(sizeof(MpegTSFilter));
492 if (!filter)
493 return NULL;
494 ts->pids[pid] = filter;
495
496 filter->type = type;
497 filter->pid = pid;
498 filter->es_id = -1;
499 filter->last_cc = -1;
500 filter->last_pcr= -1;
501
502 return filter;
503 }
504
mpegts_open_section_filter(MpegTSContext * ts,unsigned int pid,SectionCallback * section_cb,void * opaque,int check_crc)505 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
506 unsigned int pid,
507 SectionCallback *section_cb,
508 void *opaque,
509 int check_crc)
510 {
511 MpegTSFilter *filter;
512 MpegTSSectionFilter *sec;
513 uint8_t *section_buf = av_mallocz(MAX_SECTION_SIZE);
514
515 if (!section_buf)
516 return NULL;
517
518 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION))) {
519 av_free(section_buf);
520 return NULL;
521 }
522 sec = &filter->u.section_filter;
523 sec->section_cb = section_cb;
524 sec->opaque = opaque;
525 sec->section_buf = section_buf;
526 sec->check_crc = check_crc;
527 sec->last_ver = -1;
528
529 return filter;
530 }
531
mpegts_open_pes_filter(MpegTSContext * ts,unsigned int pid,PESCallback * pes_cb,void * opaque)532 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
533 PESCallback *pes_cb,
534 void *opaque)
535 {
536 MpegTSFilter *filter;
537 MpegTSPESFilter *pes;
538
539 if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
540 return NULL;
541
542 pes = &filter->u.pes_filter;
543 pes->pes_cb = pes_cb;
544 pes->opaque = opaque;
545 return filter;
546 }
547
mpegts_open_pcr_filter(MpegTSContext * ts,unsigned int pid)548 static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
549 {
550 return mpegts_open_filter(ts, pid, MPEGTS_PCR);
551 }
552
mpegts_close_filter(MpegTSContext * ts,MpegTSFilter * filter)553 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
554 {
555 int pid;
556
557 pid = filter->pid;
558 if (filter->type == MPEGTS_SECTION)
559 av_freep(&filter->u.section_filter.section_buf);
560 else if (filter->type == MPEGTS_PES) {
561 PESContext *pes = filter->u.pes_filter.opaque;
562 av_buffer_unref(&pes->buffer);
563 /* referenced private data will be freed later in
564 * avformat_close_input (pes->st->priv_data == pes) */
565 if (!pes->st || pes->merged_st) {
566 av_freep(&filter->u.pes_filter.opaque);
567 }
568 }
569
570 av_free(filter);
571 ts->pids[pid] = NULL;
572 }
573
analyze(const uint8_t * buf,int size,int packet_size,int probe)574 static int analyze(const uint8_t *buf, int size, int packet_size,
575 int probe)
576 {
577 int stat[TS_MAX_PACKET_SIZE];
578 int stat_all = 0;
579 int i;
580 int best_score = 0;
581
582 memset(stat, 0, packet_size * sizeof(*stat));
583
584 for (i = 0; i < size - 3; i++) {
585 if (buf[i] == 0x47) {
586 int pid = AV_RB16(buf+1) & 0x1FFF;
587 int asc = buf[i + 3] & 0x30;
588 if (!probe || pid == 0x1FFF || asc) {
589 int x = i % packet_size;
590 stat[x]++;
591 stat_all++;
592 if (stat[x] > best_score) {
593 best_score = stat[x];
594 }
595 }
596 }
597 }
598
599 return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
600 }
601
602 /* autodetect fec presence */
get_packet_size(AVFormatContext * s)603 static int get_packet_size(AVFormatContext* s)
604 {
605 int score, fec_score, dvhs_score;
606 int margin;
607 int ret;
608
609 /*init buffer to store stream for probing */
610 uint8_t buf[PROBE_PACKET_MAX_BUF] = {0};
611 int buf_size = 0;
612 int max_iterations = 16;
613
614 while (buf_size < PROBE_PACKET_MAX_BUF && max_iterations--) {
615 ret = avio_read_partial(s->pb, buf + buf_size, PROBE_PACKET_MAX_BUF - buf_size);
616 if (ret < 0)
617 return AVERROR_INVALIDDATA;
618 buf_size += ret;
619
620 score = analyze(buf, buf_size, TS_PACKET_SIZE, 0);
621 dvhs_score = analyze(buf, buf_size, TS_DVHS_PACKET_SIZE, 0);
622 fec_score = analyze(buf, buf_size, TS_FEC_PACKET_SIZE, 0);
623 av_log(s, AV_LOG_TRACE, "Probe: %d, score: %d, dvhs_score: %d, fec_score: %d \n",
624 buf_size, score, dvhs_score, fec_score);
625
626 margin = mid_pred(score, fec_score, dvhs_score);
627
628 if (buf_size < PROBE_PACKET_MAX_BUF)
629 margin += PROBE_PACKET_MARGIN; /*if buffer not filled */
630
631 if (score > margin)
632 return TS_PACKET_SIZE;
633 else if (dvhs_score > margin)
634 return TS_DVHS_PACKET_SIZE;
635 else if (fec_score > margin)
636 return TS_FEC_PACKET_SIZE;
637 }
638 return AVERROR_INVALIDDATA;
639 }
640
641 typedef struct SectionHeader {
642 uint8_t tid;
643 uint16_t id;
644 uint8_t version;
645 uint8_t sec_num;
646 uint8_t last_sec_num;
647 } SectionHeader;
648
skip_identical(const SectionHeader * h,MpegTSSectionFilter * tssf)649 static int skip_identical(const SectionHeader *h, MpegTSSectionFilter *tssf)
650 {
651 if (h->version == tssf->last_ver && tssf->last_crc == tssf->crc)
652 return 1;
653
654 tssf->last_ver = h->version;
655 tssf->last_crc = tssf->crc;
656
657 return 0;
658 }
659
get8(const uint8_t ** pp,const uint8_t * p_end)660 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
661 {
662 const uint8_t *p;
663 int c;
664
665 p = *pp;
666 if (p >= p_end)
667 return AVERROR_INVALIDDATA;
668 c = *p++;
669 *pp = p;
670 return c;
671 }
672
get16(const uint8_t ** pp,const uint8_t * p_end)673 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
674 {
675 const uint8_t *p;
676 int c;
677
678 p = *pp;
679 if (1 >= p_end - p)
680 return AVERROR_INVALIDDATA;
681 c = AV_RB16(p);
682 p += 2;
683 *pp = p;
684 return c;
685 }
686
687 /* read and allocate a DVB string preceded by its length */
getstr8(const uint8_t ** pp,const uint8_t * p_end)688 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
689 {
690 int len;
691 const uint8_t *p;
692 char *str;
693
694 p = *pp;
695 len = get8(&p, p_end);
696 if (len < 0)
697 return NULL;
698 if (len > p_end - p)
699 return NULL;
700 #if CONFIG_ICONV
701 if (len) {
702 const char *encodings[] = {
703 "ISO6937", "ISO-8859-5", "ISO-8859-6", "ISO-8859-7",
704 "ISO-8859-8", "ISO-8859-9", "ISO-8859-10", "ISO-8859-11",
705 "", "ISO-8859-13", "ISO-8859-14", "ISO-8859-15", "", "", "", "",
706 "", "UCS-2BE", "KSC_5601", "GB2312", "UCS-2BE", "UTF-8", "", "",
707 "", "", "", "", "", "", "", ""
708 };
709 iconv_t cd;
710 char *in, *out;
711 size_t inlen = len, outlen = inlen * 6 + 1;
712 if (len >= 3 && p[0] == 0x10 && !p[1] && p[2] && p[2] <= 0xf && p[2] != 0xc) {
713 char iso8859[12];
714 snprintf(iso8859, sizeof(iso8859), "ISO-8859-%d", p[2]);
715 inlen -= 3;
716 in = (char *)p + 3;
717 cd = iconv_open("UTF-8", iso8859);
718 } else if (p[0] < 0x20) {
719 inlen -= 1;
720 in = (char *)p + 1;
721 cd = iconv_open("UTF-8", encodings[*p]);
722 } else {
723 in = (char *)p;
724 cd = iconv_open("UTF-8", encodings[0]);
725 }
726 if (cd == (iconv_t)-1)
727 goto no_iconv;
728 str = out = av_malloc(outlen);
729 if (!str) {
730 iconv_close(cd);
731 return NULL;
732 }
733 if (iconv(cd, &in, &inlen, &out, &outlen) == -1) {
734 iconv_close(cd);
735 av_freep(&str);
736 goto no_iconv;
737 }
738 iconv_close(cd);
739 *out = 0;
740 *pp = p + len;
741 return str;
742 }
743 no_iconv:
744 #endif
745 str = av_malloc(len + 1);
746 if (!str)
747 return NULL;
748 memcpy(str, p, len);
749 str[len] = '\0';
750 p += len;
751 *pp = p;
752 return str;
753 }
754
parse_section_header(SectionHeader * h,const uint8_t ** pp,const uint8_t * p_end)755 static int parse_section_header(SectionHeader *h,
756 const uint8_t **pp, const uint8_t *p_end)
757 {
758 int val;
759
760 val = get8(pp, p_end);
761 if (val < 0)
762 return val;
763 h->tid = val;
764 *pp += 2;
765 val = get16(pp, p_end);
766 if (val < 0)
767 return val;
768 h->id = val;
769 val = get8(pp, p_end);
770 if (val < 0)
771 return val;
772 h->version = (val >> 1) & 0x1f;
773 val = get8(pp, p_end);
774 if (val < 0)
775 return val;
776 h->sec_num = val;
777 val = get8(pp, p_end);
778 if (val < 0)
779 return val;
780 h->last_sec_num = val;
781 return 0;
782 }
783
784 typedef struct StreamType {
785 uint32_t stream_type;
786 enum AVMediaType codec_type;
787 enum AVCodecID codec_id;
788 } StreamType;
789
790 static const StreamType ISO_types[] = {
791 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
792 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
793 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
794 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
795 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
796 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
797 /* Makito encoder sets stream type 0x11 for AAC,
798 * so auto-detect LOAS/LATM instead of hardcoding it. */
799 #if !CONFIG_LOAS_DEMUXER
800 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
801 #endif
802 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
803 { 0x1c, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
804 { 0x20, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
805 { 0x21, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_JPEG2000 },
806 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
807 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
808 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
809 { 0xd2, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_AVS2 },
810 { 0xd5, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AVS3DA }, /* avs3 audio */
811 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
812 { 0 },
813 };
814
815 static const StreamType HDMV_types[] = {
816 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
817 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
818 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
819 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
820 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
821 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
822 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
823 { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */
824 { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */
825 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
826 { 0x92, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_TEXT_SUBTITLE },
827 { 0 },
828 };
829
830 /* SCTE types */
831 static const StreamType SCTE_types[] = {
832 { 0x86, AVMEDIA_TYPE_DATA, AV_CODEC_ID_SCTE_35 },
833 { 0 },
834 };
835
836 /* ATSC ? */
837 static const StreamType MISC_types[] = {
838 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
839 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
840 { 0 },
841 };
842
843 static const StreamType REGD_types[] = {
844 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
845 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
846 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
847 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
848 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
849 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
850 { MKTAG('E', 'A', 'C', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
851 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
852 { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
853 { MKTAG('I', 'D', '3', ' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
854 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
855 { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
856 { MKTAG('a', 'v', '3', 'a'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AVS3DA}, /* AVS3 Audio descriptor Tag */
857 { 0 },
858 };
859
860 static const StreamType METADATA_types[] = {
861 { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
862 { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
863 { 0 },
864 };
865
866 /* descriptor present */
867 static const StreamType DESC_types[] = {
868 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
869 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
870 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
871 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
872 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
873 { 0 },
874 };
875
mpegts_find_stream_type(AVStream * st,uint32_t stream_type,const StreamType * types)876 static void mpegts_find_stream_type(AVStream *st,
877 uint32_t stream_type,
878 const StreamType *types)
879 {
880 for (; types->stream_type; types++)
881 if (stream_type == types->stream_type) {
882 if (st->codecpar->codec_type != types->codec_type ||
883 st->codecpar->codec_id != types->codec_id) {
884 st->codecpar->codec_type = types->codec_type;
885 st->codecpar->codec_id = types->codec_id;
886 st->internal->need_context_update = 1;
887 }
888 st->internal->request_probe = 0;
889 return;
890 }
891 }
892
mpegts_set_stream_info(AVStream * st,PESContext * pes,uint32_t stream_type,uint32_t prog_reg_desc)893 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
894 uint32_t stream_type, uint32_t prog_reg_desc)
895 {
896 int old_codec_type = st->codecpar->codec_type;
897 int old_codec_id = st->codecpar->codec_id;
898 int old_codec_tag = st->codecpar->codec_tag;
899
900 if (avcodec_is_open(st->internal->avctx)) {
901 av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, internal codec is open\n");
902 return 0;
903 }
904
905 avpriv_set_pts_info(st, 33, 1, 90000);
906 st->priv_data = pes;
907 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
908 st->codecpar->codec_id = AV_CODEC_ID_NONE;
909 st->need_parsing = AVSTREAM_PARSE_FULL;
910 pes->st = st;
911 pes->stream_type = stream_type;
912
913 av_log(pes->stream, AV_LOG_DEBUG,
914 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
915 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
916
917 st->codecpar->codec_tag = pes->stream_type;
918
919 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
920 if (pes->stream_type == 4 || pes->stream_type == 0x0f)
921 st->internal->request_probe = 50;
922 if ((prog_reg_desc == AV_RL32("HDMV") ||
923 prog_reg_desc == AV_RL32("HDPR")) &&
924 st->codecpar->codec_id == AV_CODEC_ID_NONE) {
925 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
926 if (pes->stream_type == 0x83) {
927 // HDMV TrueHD streams also contain an AC3 coded version of the
928 // audio track - add a second stream for this
929 AVStream *sub_st;
930 // priv_data cannot be shared between streams
931 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
932 if (!sub_pes)
933 return AVERROR(ENOMEM);
934 memcpy(sub_pes, pes, sizeof(*sub_pes));
935
936 sub_st = avformat_new_stream(pes->stream, NULL);
937 if (!sub_st) {
938 av_free(sub_pes);
939 return AVERROR(ENOMEM);
940 }
941
942 sub_st->id = pes->pid;
943 avpriv_set_pts_info(sub_st, 33, 1, 90000);
944 sub_st->priv_data = sub_pes;
945 sub_st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
946 sub_st->codecpar->codec_id = AV_CODEC_ID_AC3;
947 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
948 sub_pes->sub_st = pes->sub_st = sub_st;
949 }
950 }
951 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
952 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
953 if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
954 st->codecpar->codec_id = old_codec_id;
955 st->codecpar->codec_type = old_codec_type;
956 }
957 if ((st->codecpar->codec_id == AV_CODEC_ID_NONE ||
958 (st->internal->request_probe > 0 && st->internal->request_probe < AVPROBE_SCORE_STREAM_RETRY / 5)) &&
959 st->probe_packets > 0 &&
960 stream_type == STREAM_TYPE_PRIVATE_DATA) {
961 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
962 st->codecpar->codec_id = AV_CODEC_ID_BIN_DATA;
963 st->internal->request_probe = AVPROBE_SCORE_STREAM_RETRY / 5;
964 }
965
966 /* queue a context update if properties changed */
967 if (old_codec_type != st->codecpar->codec_type ||
968 old_codec_id != st->codecpar->codec_id ||
969 old_codec_tag != st->codecpar->codec_tag)
970 st->internal->need_context_update = 1;
971
972 return 0;
973 }
974
reset_pes_packet_state(PESContext * pes)975 static void reset_pes_packet_state(PESContext *pes)
976 {
977 pes->pts = AV_NOPTS_VALUE;
978 pes->dts = AV_NOPTS_VALUE;
979 pes->data_index = 0;
980 pes->flags = 0;
981 av_buffer_unref(&pes->buffer);
982 }
983
new_data_packet(const uint8_t * buffer,int len,AVPacket * pkt)984 static void new_data_packet(const uint8_t *buffer, int len, AVPacket *pkt)
985 {
986 av_packet_unref(pkt);
987 pkt->data = (uint8_t *)buffer;
988 pkt->size = len;
989 }
990
new_pes_packet(PESContext * pes,AVPacket * pkt)991 static int new_pes_packet(PESContext *pes, AVPacket *pkt)
992 {
993 uint8_t *sd;
994
995 av_packet_unref(pkt);
996
997 pkt->buf = pes->buffer;
998 pkt->data = pes->buffer->data;
999 pkt->size = pes->data_index;
1000
1001 if (pes->total_size != MAX_PES_PAYLOAD &&
1002 pes->pes_header_size + pes->data_index != pes->total_size +
1003 PES_START_SIZE) {
1004 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
1005 pes->flags |= AV_PKT_FLAG_CORRUPT;
1006 }
1007 memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1008
1009 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
1010 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
1011 pkt->stream_index = pes->sub_st->index;
1012 else
1013 pkt->stream_index = pes->st->index;
1014 pkt->pts = pes->pts;
1015 pkt->dts = pes->dts;
1016 /* store position of first TS packet of this PES packet */
1017 pkt->pos = pes->ts_packet_pos;
1018 pkt->flags = pes->flags;
1019
1020 pes->buffer = NULL;
1021 reset_pes_packet_state(pes);
1022
1023 sd = av_packet_new_side_data(pkt, AV_PKT_DATA_MPEGTS_STREAM_ID, 1);
1024 if (!sd)
1025 return AVERROR(ENOMEM);
1026 *sd = pes->stream_id;
1027
1028 return 0;
1029 }
1030
get_ts64(GetBitContext * gb,int bits)1031 static uint64_t get_ts64(GetBitContext *gb, int bits)
1032 {
1033 if (get_bits_left(gb) < bits)
1034 return AV_NOPTS_VALUE;
1035 return get_bits64(gb, bits);
1036 }
1037
read_sl_header(PESContext * pes,SLConfigDescr * sl,const uint8_t * buf,int buf_size)1038 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
1039 const uint8_t *buf, int buf_size)
1040 {
1041 GetBitContext gb;
1042 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
1043 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
1044 int dts_flag = -1, cts_flag = -1;
1045 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
1046 uint8_t buf_padded[128 + AV_INPUT_BUFFER_PADDING_SIZE];
1047 int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - AV_INPUT_BUFFER_PADDING_SIZE);
1048
1049 memcpy(buf_padded, buf, buf_padded_size);
1050
1051 init_get_bits(&gb, buf_padded, buf_padded_size * 8);
1052
1053 if (sl->use_au_start)
1054 au_start_flag = get_bits1(&gb);
1055 if (sl->use_au_end)
1056 au_end_flag = get_bits1(&gb);
1057 if (!sl->use_au_start && !sl->use_au_end)
1058 au_start_flag = au_end_flag = 1;
1059 if (sl->ocr_len > 0)
1060 ocr_flag = get_bits1(&gb);
1061 if (sl->use_idle)
1062 idle_flag = get_bits1(&gb);
1063 if (sl->use_padding)
1064 padding_flag = get_bits1(&gb);
1065 if (padding_flag)
1066 padding_bits = get_bits(&gb, 3);
1067
1068 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
1069 if (sl->packet_seq_num_len)
1070 skip_bits_long(&gb, sl->packet_seq_num_len);
1071 if (sl->degr_prior_len)
1072 if (get_bits1(&gb))
1073 skip_bits(&gb, sl->degr_prior_len);
1074 if (ocr_flag)
1075 skip_bits_long(&gb, sl->ocr_len);
1076 if (au_start_flag) {
1077 if (sl->use_rand_acc_pt)
1078 get_bits1(&gb);
1079 if (sl->au_seq_num_len > 0)
1080 skip_bits_long(&gb, sl->au_seq_num_len);
1081 if (sl->use_timestamps) {
1082 dts_flag = get_bits1(&gb);
1083 cts_flag = get_bits1(&gb);
1084 }
1085 }
1086 if (sl->inst_bitrate_len)
1087 inst_bitrate_flag = get_bits1(&gb);
1088 if (dts_flag == 1)
1089 dts = get_ts64(&gb, sl->timestamp_len);
1090 if (cts_flag == 1)
1091 cts = get_ts64(&gb, sl->timestamp_len);
1092 if (sl->au_len > 0)
1093 skip_bits_long(&gb, sl->au_len);
1094 if (inst_bitrate_flag)
1095 skip_bits_long(&gb, sl->inst_bitrate_len);
1096 }
1097
1098 if (dts != AV_NOPTS_VALUE)
1099 pes->dts = dts;
1100 if (cts != AV_NOPTS_VALUE)
1101 pes->pts = cts;
1102
1103 if (sl->timestamp_len && sl->timestamp_res)
1104 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
1105
1106 return (get_bits_count(&gb) + 7) >> 3;
1107 }
1108
buffer_pool_get(MpegTSContext * ts,int size)1109 static AVBufferRef *buffer_pool_get(MpegTSContext *ts, int size)
1110 {
1111 int index = av_log2(size + AV_INPUT_BUFFER_PADDING_SIZE);
1112 if (!ts->pools[index]) {
1113 int pool_size = FFMIN(MAX_PES_PAYLOAD + AV_INPUT_BUFFER_PADDING_SIZE, 2 << index);
1114 ts->pools[index] = av_buffer_pool_init(pool_size, NULL);
1115 if (!ts->pools[index])
1116 return NULL;
1117 }
1118 return av_buffer_pool_get(ts->pools[index]);
1119 }
1120
1121 /* return non zero if a packet could be constructed */
mpegts_push_data(MpegTSFilter * filter,const uint8_t * buf,int buf_size,int is_start,int64_t pos)1122 static int mpegts_push_data(MpegTSFilter *filter,
1123 const uint8_t *buf, int buf_size, int is_start,
1124 int64_t pos)
1125 {
1126 PESContext *pes = filter->u.pes_filter.opaque;
1127 MpegTSContext *ts = pes->ts;
1128 const uint8_t *p;
1129 int ret, len, code;
1130
1131 if (!ts->pkt)
1132 return 0;
1133
1134 if (is_start) {
1135 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
1136 ret = new_pes_packet(pes, ts->pkt);
1137 if (ret < 0)
1138 return ret;
1139 ts->stop_parse = 1;
1140 } else {
1141 reset_pes_packet_state(pes);
1142 }
1143 pes->state = MPEGTS_HEADER;
1144 pes->ts_packet_pos = pos;
1145 }
1146 p = buf;
1147 while (buf_size > 0) {
1148 switch (pes->state) {
1149 case MPEGTS_HEADER:
1150 len = PES_START_SIZE - pes->data_index;
1151 if (len > buf_size)
1152 len = buf_size;
1153 memcpy(pes->header + pes->data_index, p, len);
1154 pes->data_index += len;
1155 p += len;
1156 buf_size -= len;
1157 if (pes->data_index == PES_START_SIZE) {
1158 /* we got all the PES or section header. We can now
1159 * decide */
1160 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
1161 pes->header[2] == 0x01) {
1162 /* it must be an MPEG-2 PES stream */
1163 code = pes->header[3] | 0x100;
1164 av_log(pes->stream, AV_LOG_TRACE, "pid=%x pes_code=%#x\n", pes->pid,
1165 code);
1166 pes->stream_id = pes->header[3];
1167
1168 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
1169 (!pes->sub_st ||
1170 pes->sub_st->discard == AVDISCARD_ALL)) ||
1171 code == 0x1be) /* padding_stream */
1172 goto skip;
1173
1174 /* stream not present in PMT */
1175 if (!pes->st) {
1176 if (ts->skip_changes)
1177 goto skip;
1178 if (ts->merge_pmt_versions)
1179 goto skip; /* wait for PMT to merge new stream */
1180
1181 pes->st = avformat_new_stream(ts->stream, NULL);
1182 if (!pes->st)
1183 return AVERROR(ENOMEM);
1184 pes->st->id = pes->pid;
1185 mpegts_set_stream_info(pes->st, pes, 0, 0);
1186 }
1187
1188 pes->total_size = AV_RB16(pes->header + 4);
1189 /* NOTE: a zero total size means the PES size is
1190 * unbounded */
1191 if (!pes->total_size)
1192 pes->total_size = MAX_PES_PAYLOAD;
1193
1194 /* allocate pes buffer */
1195 pes->buffer = buffer_pool_get(ts, pes->total_size);
1196 if (!pes->buffer)
1197 return AVERROR(ENOMEM);
1198
1199 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
1200 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
1201 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
1202 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
1203 pes->state = MPEGTS_PESHEADER;
1204 if (pes->st->codecpar->codec_id == AV_CODEC_ID_NONE && !pes->st->internal->request_probe) {
1205 av_log(pes->stream, AV_LOG_TRACE,
1206 "pid=%x stream_type=%x probing\n",
1207 pes->pid,
1208 pes->stream_type);
1209 pes->st->internal->request_probe = 1;
1210 }
1211 } else {
1212 pes->pes_header_size = 6;
1213 pes->state = MPEGTS_PAYLOAD;
1214 pes->data_index = 0;
1215 }
1216 } else {
1217 /* otherwise, it should be a table */
1218 /* skip packet */
1219 skip:
1220 pes->state = MPEGTS_SKIP;
1221 continue;
1222 }
1223 }
1224 break;
1225 /**********************************************/
1226 /* PES packing parsing */
1227 case MPEGTS_PESHEADER:
1228 len = PES_HEADER_SIZE - pes->data_index;
1229 if (len < 0)
1230 return AVERROR_INVALIDDATA;
1231 if (len > buf_size)
1232 len = buf_size;
1233 memcpy(pes->header + pes->data_index, p, len);
1234 pes->data_index += len;
1235 p += len;
1236 buf_size -= len;
1237 if (pes->data_index == PES_HEADER_SIZE) {
1238 pes->pes_header_size = pes->header[8] + 9;
1239 pes->state = MPEGTS_PESHEADER_FILL;
1240 }
1241 break;
1242 case MPEGTS_PESHEADER_FILL:
1243 len = pes->pes_header_size - pes->data_index;
1244 if (len < 0)
1245 return AVERROR_INVALIDDATA;
1246 if (len > buf_size)
1247 len = buf_size;
1248 memcpy(pes->header + pes->data_index, p, len);
1249 pes->data_index += len;
1250 p += len;
1251 buf_size -= len;
1252 if (pes->data_index == pes->pes_header_size) {
1253 const uint8_t *r;
1254 unsigned int flags, pes_ext, skip;
1255
1256 flags = pes->header[7];
1257 r = pes->header + 9;
1258 pes->pts = AV_NOPTS_VALUE;
1259 pes->dts = AV_NOPTS_VALUE;
1260 if ((flags & 0xc0) == 0x80) {
1261 pes->dts = pes->pts = ff_parse_pes_pts(r);
1262 r += 5;
1263 } else if ((flags & 0xc0) == 0xc0) {
1264 pes->pts = ff_parse_pes_pts(r);
1265 r += 5;
1266 pes->dts = ff_parse_pes_pts(r);
1267 r += 5;
1268 }
1269 pes->extended_stream_id = -1;
1270 if (flags & 0x01) { /* PES extension */
1271 pes_ext = *r++;
1272 /* Skip PES private data, program packet sequence counter and P-STD buffer */
1273 skip = (pes_ext >> 4) & 0xb;
1274 skip += skip & 0x9;
1275 r += skip;
1276 if ((pes_ext & 0x41) == 0x01 &&
1277 (r + 2) <= (pes->header + pes->pes_header_size)) {
1278 /* PES extension 2 */
1279 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
1280 pes->extended_stream_id = r[1];
1281 }
1282 }
1283
1284 /* we got the full header. We parse it and get the payload */
1285 pes->state = MPEGTS_PAYLOAD;
1286 pes->data_index = 0;
1287 if (pes->stream_type == 0x12 && buf_size > 0) {
1288 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
1289 buf_size);
1290 pes->pes_header_size += sl_header_bytes;
1291 p += sl_header_bytes;
1292 buf_size -= sl_header_bytes;
1293 }
1294 if (pes->stream_type == 0x15 && buf_size >= 5) {
1295 /* skip metadata access unit header */
1296 pes->pes_header_size += 5;
1297 p += 5;
1298 buf_size -= 5;
1299 }
1300 if ( pes->ts->fix_teletext_pts
1301 && ( pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT
1302 || pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
1303 ) {
1304 AVProgram *p = NULL;
1305 int pcr_found = 0;
1306 while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
1307 if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
1308 MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
1309 if (f) {
1310 AVStream *st = NULL;
1311 if (f->type == MPEGTS_PES) {
1312 PESContext *pcrpes = f->u.pes_filter.opaque;
1313 if (pcrpes)
1314 st = pcrpes->st;
1315 } else if (f->type == MPEGTS_PCR) {
1316 int i;
1317 for (i = 0; i < p->nb_stream_indexes; i++) {
1318 AVStream *pst = pes->stream->streams[p->stream_index[i]];
1319 if (pst->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
1320 st = pst;
1321 }
1322 }
1323 if (f->last_pcr != -1 && !f->discard) {
1324 // teletext packets do not always have correct timestamps,
1325 // the standard says they should be handled after 40.6 ms at most,
1326 // and the pcr error to this packet should be no more than 100 ms.
1327 // TODO: we should interpolate the PCR, not just use the last one
1328 int64_t pcr = f->last_pcr / 300;
1329 pcr_found = 1;
1330 if (st) {
1331 pes->st->internal->pts_wrap_reference = st->internal->pts_wrap_reference;
1332 pes->st->internal->pts_wrap_behavior = st->internal->pts_wrap_behavior;
1333 }
1334 if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
1335 pes->pts = pes->dts = pcr;
1336 } else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT &&
1337 pes->dts > pcr + 3654 + 9000) {
1338 pes->pts = pes->dts = pcr + 3654 + 9000;
1339 } else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE &&
1340 pes->dts > pcr + 10*90000) { //10sec
1341 pes->pts = pes->dts = pcr + 3654 + 9000;
1342 }
1343 break;
1344 }
1345 }
1346 }
1347 }
1348
1349 if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT &&
1350 !pcr_found) {
1351 av_log(pes->stream, AV_LOG_VERBOSE,
1352 "Forcing DTS/PTS to be unset for a "
1353 "non-trustworthy PES packet for PID %d as "
1354 "PCR hasn't been received yet.\n",
1355 pes->pid);
1356 pes->dts = pes->pts = AV_NOPTS_VALUE;
1357 }
1358 }
1359 }
1360 break;
1361 case MPEGTS_PAYLOAD:
1362 if (pes->buffer) {
1363 if (pes->data_index > 0 &&
1364 pes->data_index + buf_size > pes->total_size) {
1365 ret = new_pes_packet(pes, ts->pkt);
1366 if (ret < 0)
1367 return ret;
1368 pes->total_size = MAX_PES_PAYLOAD;
1369 pes->buffer = buffer_pool_get(ts, pes->total_size);
1370 if (!pes->buffer)
1371 return AVERROR(ENOMEM);
1372 ts->stop_parse = 1;
1373 } else if (pes->data_index == 0 &&
1374 buf_size > pes->total_size) {
1375 // pes packet size is < ts size packet and pes data is padded with 0xff
1376 // not sure if this is legal in ts but see issue #2392
1377 buf_size = pes->total_size;
1378 }
1379 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
1380 pes->data_index += buf_size;
1381 /* emit complete packets with known packet size
1382 * decreases demuxer delay for infrequent packets like subtitles from
1383 * a couple of seconds to milliseconds for properly muxed files.
1384 * total_size is the number of bytes following pes_packet_length
1385 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
1386 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
1387 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
1388 ts->stop_parse = 1;
1389 ret = new_pes_packet(pes, ts->pkt);
1390 if (ret < 0)
1391 return ret;
1392 }
1393 }
1394 buf_size = 0;
1395 break;
1396 case MPEGTS_SKIP:
1397 buf_size = 0;
1398 break;
1399 }
1400 }
1401
1402 return 0;
1403 }
1404
add_pes_stream(MpegTSContext * ts,int pid,int pcr_pid)1405 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1406 {
1407 MpegTSFilter *tss;
1408 PESContext *pes;
1409
1410 /* if no pid found, then add a pid context */
1411 pes = av_mallocz(sizeof(PESContext));
1412 if (!pes)
1413 return 0;
1414 pes->ts = ts;
1415 pes->stream = ts->stream;
1416 pes->pid = pid;
1417 pes->pcr_pid = pcr_pid;
1418 pes->state = MPEGTS_SKIP;
1419 pes->pts = AV_NOPTS_VALUE;
1420 pes->dts = AV_NOPTS_VALUE;
1421 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1422 if (!tss) {
1423 av_free(pes);
1424 return 0;
1425 }
1426 return pes;
1427 }
1428
1429 #define MAX_LEVEL 4
1430 typedef struct MP4DescrParseContext {
1431 AVFormatContext *s;
1432 AVIOContext pb;
1433 Mp4Descr *descr;
1434 Mp4Descr *active_descr;
1435 int descr_count;
1436 int max_descr_count;
1437 int level;
1438 int predefined_SLConfigDescriptor_seen;
1439 } MP4DescrParseContext;
1440
init_MP4DescrParseContext(MP4DescrParseContext * d,AVFormatContext * s,const uint8_t * buf,unsigned size,Mp4Descr * descr,int max_descr_count)1441 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1442 const uint8_t *buf, unsigned size,
1443 Mp4Descr *descr, int max_descr_count)
1444 {
1445 int ret;
1446 if (size > (1 << 30))
1447 return AVERROR_INVALIDDATA;
1448
1449 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1450 NULL, NULL, NULL, NULL)) < 0)
1451 return ret;
1452
1453 d->s = s;
1454 d->level = 0;
1455 d->descr_count = 0;
1456 d->descr = descr;
1457 d->active_descr = NULL;
1458 d->max_descr_count = max_descr_count;
1459
1460 return 0;
1461 }
1462
update_offsets(AVIOContext * pb,int64_t * off,int * len)1463 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1464 {
1465 int64_t new_off = avio_tell(pb);
1466 (*len) -= new_off - *off;
1467 *off = new_off;
1468 }
1469
1470 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1471 int target_tag);
1472
parse_mp4_descr_arr(MP4DescrParseContext * d,int64_t off,int len)1473 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1474 {
1475 while (len > 0) {
1476 int ret = parse_mp4_descr(d, off, len, 0);
1477 if (ret < 0)
1478 return ret;
1479 update_offsets(&d->pb, &off, &len);
1480 }
1481 return 0;
1482 }
1483
parse_MP4IODescrTag(MP4DescrParseContext * d,int64_t off,int len)1484 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1485 {
1486 avio_rb16(&d->pb); // ID
1487 avio_r8(&d->pb);
1488 avio_r8(&d->pb);
1489 avio_r8(&d->pb);
1490 avio_r8(&d->pb);
1491 avio_r8(&d->pb);
1492 update_offsets(&d->pb, &off, &len);
1493 return parse_mp4_descr_arr(d, off, len);
1494 }
1495
parse_MP4ODescrTag(MP4DescrParseContext * d,int64_t off,int len)1496 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1497 {
1498 int id_flags;
1499 if (len < 2)
1500 return 0;
1501 id_flags = avio_rb16(&d->pb);
1502 if (!(id_flags & 0x0020)) { // URL_Flag
1503 update_offsets(&d->pb, &off, &len);
1504 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1505 } else {
1506 return 0;
1507 }
1508 }
1509
parse_MP4ESDescrTag(MP4DescrParseContext * d,int64_t off,int len)1510 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1511 {
1512 int es_id = 0;
1513 int ret = 0;
1514
1515 if (d->descr_count >= d->max_descr_count)
1516 return AVERROR_INVALIDDATA;
1517 ff_mp4_parse_es_descr(&d->pb, &es_id);
1518 d->active_descr = d->descr + (d->descr_count++);
1519
1520 d->active_descr->es_id = es_id;
1521 update_offsets(&d->pb, &off, &len);
1522 if ((ret = parse_mp4_descr(d, off, len, MP4DecConfigDescrTag)) < 0)
1523 return ret;
1524 update_offsets(&d->pb, &off, &len);
1525 if (len > 0)
1526 ret = parse_mp4_descr(d, off, len, MP4SLDescrTag);
1527 d->active_descr = NULL;
1528 return ret;
1529 }
1530
parse_MP4DecConfigDescrTag(MP4DescrParseContext * d,int64_t off,int len)1531 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1532 int len)
1533 {
1534 Mp4Descr *descr = d->active_descr;
1535 if (!descr)
1536 return AVERROR_INVALIDDATA;
1537 d->active_descr->dec_config_descr = av_malloc(len);
1538 if (!descr->dec_config_descr)
1539 return AVERROR(ENOMEM);
1540 descr->dec_config_descr_len = len;
1541 avio_read(&d->pb, descr->dec_config_descr, len);
1542 return 0;
1543 }
1544
parse_MP4SLDescrTag(MP4DescrParseContext * d,int64_t off,int len)1545 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1546 {
1547 Mp4Descr *descr = d->active_descr;
1548 int predefined;
1549 if (!descr)
1550 return AVERROR_INVALIDDATA;
1551
1552 #define R8_CHECK_CLIP_MAX(dst, maxv) do { \
1553 descr->sl.dst = avio_r8(&d->pb); \
1554 if (descr->sl.dst > maxv) { \
1555 descr->sl.dst = maxv; \
1556 return AVERROR_INVALIDDATA; \
1557 } \
1558 } while (0)
1559
1560 predefined = avio_r8(&d->pb);
1561 if (!predefined) {
1562 int lengths;
1563 int flags = avio_r8(&d->pb);
1564 descr->sl.use_au_start = !!(flags & 0x80);
1565 descr->sl.use_au_end = !!(flags & 0x40);
1566 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1567 descr->sl.use_padding = !!(flags & 0x08);
1568 descr->sl.use_timestamps = !!(flags & 0x04);
1569 descr->sl.use_idle = !!(flags & 0x02);
1570 descr->sl.timestamp_res = avio_rb32(&d->pb);
1571 avio_rb32(&d->pb);
1572 R8_CHECK_CLIP_MAX(timestamp_len, 63);
1573 R8_CHECK_CLIP_MAX(ocr_len, 63);
1574 R8_CHECK_CLIP_MAX(au_len, 31);
1575 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1576 lengths = avio_rb16(&d->pb);
1577 descr->sl.degr_prior_len = lengths >> 12;
1578 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1579 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1580 } else if (!d->predefined_SLConfigDescriptor_seen){
1581 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1582 d->predefined_SLConfigDescriptor_seen = 1;
1583 }
1584 return 0;
1585 }
1586
parse_mp4_descr(MP4DescrParseContext * d,int64_t off,int len,int target_tag)1587 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1588 int target_tag)
1589 {
1590 int tag;
1591 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1592 int ret = 0;
1593
1594 update_offsets(&d->pb, &off, &len);
1595 if (len < 0 || len1 > len || len1 <= 0) {
1596 av_log(d->s, AV_LOG_ERROR,
1597 "Tag %x length violation new length %d bytes remaining %d\n",
1598 tag, len1, len);
1599 return AVERROR_INVALIDDATA;
1600 }
1601
1602 if (d->level++ >= MAX_LEVEL) {
1603 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1604 ret = AVERROR_INVALIDDATA;
1605 goto done;
1606 }
1607
1608 if (target_tag && tag != target_tag) {
1609 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1610 target_tag);
1611 ret = AVERROR_INVALIDDATA;
1612 goto done;
1613 }
1614
1615 switch (tag) {
1616 case MP4IODescrTag:
1617 ret = parse_MP4IODescrTag(d, off, len1);
1618 break;
1619 case MP4ODescrTag:
1620 ret = parse_MP4ODescrTag(d, off, len1);
1621 break;
1622 case MP4ESDescrTag:
1623 ret = parse_MP4ESDescrTag(d, off, len1);
1624 break;
1625 case MP4DecConfigDescrTag:
1626 ret = parse_MP4DecConfigDescrTag(d, off, len1);
1627 break;
1628 case MP4SLDescrTag:
1629 ret = parse_MP4SLDescrTag(d, off, len1);
1630 break;
1631 }
1632
1633
1634 done:
1635 d->level--;
1636 avio_seek(&d->pb, off + len1, SEEK_SET);
1637 return ret;
1638 }
1639
mp4_read_iods(AVFormatContext * s,const uint8_t * buf,unsigned size,Mp4Descr * descr,int * descr_count,int max_descr_count)1640 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1641 Mp4Descr *descr, int *descr_count, int max_descr_count)
1642 {
1643 MP4DescrParseContext d;
1644 int ret;
1645
1646 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1647 if (ret < 0)
1648 return ret;
1649
1650 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1651
1652 *descr_count = d.descr_count;
1653 return ret;
1654 }
1655
mp4_read_od(AVFormatContext * s,const uint8_t * buf,unsigned size,Mp4Descr * descr,int * descr_count,int max_descr_count)1656 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1657 Mp4Descr *descr, int *descr_count, int max_descr_count)
1658 {
1659 MP4DescrParseContext d;
1660 int ret;
1661
1662 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1663 if (ret < 0)
1664 return ret;
1665
1666 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1667
1668 *descr_count = d.descr_count;
1669 return ret;
1670 }
1671
m4sl_cb(MpegTSFilter * filter,const uint8_t * section,int section_len)1672 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1673 int section_len)
1674 {
1675 MpegTSContext *ts = filter->u.section_filter.opaque;
1676 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1677 SectionHeader h;
1678 const uint8_t *p, *p_end;
1679 AVIOContext pb;
1680 int mp4_descr_count = 0;
1681 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1682 int i, pid;
1683 AVFormatContext *s = ts->stream;
1684
1685 p_end = section + section_len - 4;
1686 p = section;
1687 if (parse_section_header(&h, &p, p_end) < 0)
1688 return;
1689 if (h.tid != M4OD_TID)
1690 return;
1691 if (skip_identical(&h, tssf))
1692 return;
1693
1694 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1695 MAX_MP4_DESCR_COUNT);
1696
1697 for (pid = 0; pid < NB_PID_MAX; pid++) {
1698 if (!ts->pids[pid])
1699 continue;
1700 for (i = 0; i < mp4_descr_count; i++) {
1701 PESContext *pes;
1702 AVStream *st;
1703 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1704 continue;
1705 if (ts->pids[pid]->type != MPEGTS_PES) {
1706 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1707 continue;
1708 }
1709 pes = ts->pids[pid]->u.pes_filter.opaque;
1710 st = pes->st;
1711 if (!st)
1712 continue;
1713
1714 pes->sl = mp4_descr[i].sl;
1715
1716 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1717 mp4_descr[i].dec_config_descr_len, 0,
1718 NULL, NULL, NULL, NULL);
1719 ff_mp4_read_dec_config_descr(s, st, &pb);
1720 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1721 st->codecpar->extradata_size > 0)
1722 st->need_parsing = 0;
1723 if (st->codecpar->codec_id == AV_CODEC_ID_H264 &&
1724 st->codecpar->extradata_size > 0)
1725 st->need_parsing = 0;
1726
1727 st->codecpar->codec_type = avcodec_get_type(st->codecpar->codec_id);
1728 st->internal->need_context_update = 1;
1729 }
1730 }
1731 for (i = 0; i < mp4_descr_count; i++)
1732 av_free(mp4_descr[i].dec_config_descr);
1733 }
1734
scte_data_cb(MpegTSFilter * filter,const uint8_t * section,int section_len)1735 static void scte_data_cb(MpegTSFilter *filter, const uint8_t *section,
1736 int section_len)
1737 {
1738 AVProgram *prg = NULL;
1739 MpegTSContext *ts = filter->u.section_filter.opaque;
1740
1741 int idx = ff_find_stream_index(ts->stream, filter->pid);
1742 if (idx < 0)
1743 return;
1744
1745 /**
1746 * In case we receive an SCTE-35 packet before mpegts context is fully
1747 * initialized.
1748 */
1749 if (!ts->pkt)
1750 return;
1751
1752 new_data_packet(section, section_len, ts->pkt);
1753 ts->pkt->stream_index = idx;
1754 prg = av_find_program_from_stream(ts->stream, NULL, idx);
1755 if (prg && prg->pcr_pid != -1 && prg->discard != AVDISCARD_ALL) {
1756 MpegTSFilter *f = ts->pids[prg->pcr_pid];
1757 if (f && f->last_pcr != -1)
1758 ts->pkt->pts = ts->pkt->dts = f->last_pcr/300;
1759 }
1760 ts->stop_parse = 1;
1761
1762 }
1763
1764 static const uint8_t opus_coupled_stream_cnt[9] = {
1765 1, 0, 1, 1, 2, 2, 2, 3, 3
1766 };
1767
1768 static const uint8_t opus_stream_cnt[9] = {
1769 1, 1, 1, 2, 2, 3, 4, 4, 5,
1770 };
1771
1772 static const uint8_t opus_channel_map[8][8] = {
1773 { 0 },
1774 { 0,1 },
1775 { 0,2,1 },
1776 { 0,1,2,3 },
1777 { 0,4,1,2,3 },
1778 { 0,4,1,2,3,5 },
1779 { 0,4,1,2,3,5,6 },
1780 { 0,6,1,2,3,4,5,7 },
1781 };
1782
ff_parse_mpeg2_descriptor(AVFormatContext * fc,AVStream * st,int stream_type,const uint8_t ** pp,const uint8_t * desc_list_end,Mp4Descr * mp4_descr,int mp4_descr_count,int pid,MpegTSContext * ts)1783 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1784 const uint8_t **pp, const uint8_t *desc_list_end,
1785 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1786 MpegTSContext *ts)
1787 {
1788 const uint8_t *desc_end;
1789 int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1790 char language[252];
1791 int i;
1792
1793 desc_tag = get8(pp, desc_list_end);
1794 if (desc_tag < 0)
1795 return AVERROR_INVALIDDATA;
1796 desc_len = get8(pp, desc_list_end);
1797 if (desc_len < 0)
1798 return AVERROR_INVALIDDATA;
1799 desc_end = *pp + desc_len;
1800 if (desc_end > desc_list_end)
1801 return AVERROR_INVALIDDATA;
1802
1803 av_log(fc, AV_LOG_TRACE, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1804
1805 if ((st->codecpar->codec_id == AV_CODEC_ID_NONE || st->internal->request_probe > 0) &&
1806 stream_type == STREAM_TYPE_PRIVATE_DATA)
1807 mpegts_find_stream_type(st, desc_tag, DESC_types);
1808
1809 switch (desc_tag) {
1810 case VIDEO_STREAM_DESCRIPTOR:
1811 if (get8(pp, desc_end) & 0x1) {
1812 st->disposition |= AV_DISPOSITION_STILL_IMAGE;
1813 }
1814 break;
1815 case SL_DESCRIPTOR:
1816 desc_es_id = get16(pp, desc_end);
1817 if (desc_es_id < 0)
1818 break;
1819 if (ts && ts->pids[pid])
1820 ts->pids[pid]->es_id = desc_es_id;
1821 for (i = 0; i < mp4_descr_count; i++)
1822 if (mp4_descr[i].dec_config_descr_len &&
1823 mp4_descr[i].es_id == desc_es_id) {
1824 AVIOContext pb;
1825 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1826 mp4_descr[i].dec_config_descr_len, 0,
1827 NULL, NULL, NULL, NULL);
1828 ff_mp4_read_dec_config_descr(fc, st, &pb);
1829 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1830 st->codecpar->extradata_size > 0) {
1831 st->need_parsing = 0;
1832 st->internal->need_context_update = 1;
1833 }
1834 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1835 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1836 }
1837 break;
1838 case FMC_DESCRIPTOR:
1839 if (get16(pp, desc_end) < 0)
1840 break;
1841 if (mp4_descr_count > 0 &&
1842 (st->codecpar->codec_id == AV_CODEC_ID_AAC_LATM ||
1843 (st->internal->request_probe == 0 && st->codecpar->codec_id == AV_CODEC_ID_NONE) ||
1844 st->internal->request_probe > 0) &&
1845 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1846 AVIOContext pb;
1847 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1848 mp4_descr->dec_config_descr_len, 0,
1849 NULL, NULL, NULL, NULL);
1850 ff_mp4_read_dec_config_descr(fc, st, &pb);
1851 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
1852 st->codecpar->extradata_size > 0) {
1853 st->internal->request_probe = st->need_parsing = 0;
1854 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
1855 st->internal->need_context_update = 1;
1856 }
1857 }
1858 break;
1859 case 0x56: /* DVB teletext descriptor */
1860 {
1861 uint8_t *extradata = NULL;
1862 int language_count = desc_len / 5, ret;
1863
1864 if (desc_len > 0 && desc_len % 5 != 0)
1865 return AVERROR_INVALIDDATA;
1866
1867 if (language_count > 0) {
1868 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1869 av_assert0(language_count <= sizeof(language) / 4);
1870
1871 if (st->codecpar->extradata == NULL) {
1872 ret = ff_alloc_extradata(st->codecpar, language_count * 2);
1873 if (ret < 0)
1874 return ret;
1875 }
1876
1877 if (st->codecpar->extradata_size < language_count * 2)
1878 return AVERROR_INVALIDDATA;
1879
1880 extradata = st->codecpar->extradata;
1881
1882 for (i = 0; i < language_count; i++) {
1883 language[i * 4 + 0] = get8(pp, desc_end);
1884 language[i * 4 + 1] = get8(pp, desc_end);
1885 language[i * 4 + 2] = get8(pp, desc_end);
1886 language[i * 4 + 3] = ',';
1887
1888 memcpy(extradata, *pp, 2);
1889 extradata += 2;
1890
1891 *pp += 2;
1892 }
1893
1894 language[i * 4 - 1] = 0;
1895 av_dict_set(&st->metadata, "language", language, 0);
1896 st->internal->need_context_update = 1;
1897 }
1898 }
1899 break;
1900 case 0x59: /* subtitling descriptor */
1901 {
1902 /* 8 bytes per DVB subtitle substream data:
1903 * ISO_639_language_code (3 bytes),
1904 * subtitling_type (1 byte),
1905 * composition_page_id (2 bytes),
1906 * ancillary_page_id (2 bytes) */
1907 int language_count = desc_len / 8, ret;
1908
1909 if (desc_len > 0 && desc_len % 8 != 0)
1910 return AVERROR_INVALIDDATA;
1911
1912 if (language_count > 1) {
1913 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
1914 }
1915
1916 if (language_count > 0) {
1917 uint8_t *extradata;
1918
1919 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
1920 av_assert0(language_count <= sizeof(language) / 4);
1921
1922 if (st->codecpar->extradata == NULL) {
1923 ret = ff_alloc_extradata(st->codecpar, language_count * 5);
1924 if (ret < 0)
1925 return ret;
1926 }
1927
1928 if (st->codecpar->extradata_size < language_count * 5)
1929 return AVERROR_INVALIDDATA;
1930
1931 extradata = st->codecpar->extradata;
1932
1933 for (i = 0; i < language_count; i++) {
1934 language[i * 4 + 0] = get8(pp, desc_end);
1935 language[i * 4 + 1] = get8(pp, desc_end);
1936 language[i * 4 + 2] = get8(pp, desc_end);
1937 language[i * 4 + 3] = ',';
1938
1939 /* hearing impaired subtitles detection using subtitling_type */
1940 switch (*pp[0]) {
1941 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1942 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1943 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1944 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1945 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1946 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1947 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1948 break;
1949 }
1950
1951 extradata[4] = get8(pp, desc_end); /* subtitling_type */
1952 memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
1953 extradata += 5;
1954
1955 *pp += 4;
1956 }
1957
1958 language[i * 4 - 1] = 0;
1959 av_dict_set(&st->metadata, "language", language, 0);
1960 st->internal->need_context_update = 1;
1961 }
1962 }
1963 break;
1964 case ISO_639_LANGUAGE_DESCRIPTOR:
1965 for (i = 0; i + 4 <= desc_len; i += 4) {
1966 language[i + 0] = get8(pp, desc_end);
1967 language[i + 1] = get8(pp, desc_end);
1968 language[i + 2] = get8(pp, desc_end);
1969 language[i + 3] = ',';
1970 switch (get8(pp, desc_end)) {
1971 case 0x01:
1972 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1973 break;
1974 case 0x02:
1975 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1976 break;
1977 case 0x03:
1978 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1979 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
1980 break;
1981 }
1982 }
1983 if (i && language[0]) {
1984 language[i - 1] = 0;
1985 /* don't overwrite language, as it may already have been set by
1986 * another, more specific descriptor (e.g. supplementary audio) */
1987 av_dict_set(&st->metadata, "language", language, AV_DICT_DONT_OVERWRITE);
1988 }
1989 break;
1990 case REGISTRATION_DESCRIPTOR:
1991 st->codecpar->codec_tag = bytestream_get_le32(pp);
1992 av_log(fc, AV_LOG_TRACE, "reg_desc=%.4s\n", (char *)&st->codecpar->codec_tag);
1993 if (st->codecpar->codec_id == AV_CODEC_ID_NONE || st->internal->request_probe > 0) {
1994 mpegts_find_stream_type(st, st->codecpar->codec_tag, REGD_types);
1995 if (st->codecpar->codec_tag == MKTAG('B', 'S', 'S', 'D'))
1996 st->internal->request_probe = 50;
1997 }
1998 break;
1999 case 0x52: /* stream identifier descriptor */
2000 st->stream_identifier = 1 + get8(pp, desc_end);
2001 break;
2002 case METADATA_DESCRIPTOR:
2003 if (get16(pp, desc_end) == 0xFFFF)
2004 *pp += 4;
2005 if (get8(pp, desc_end) == 0xFF) {
2006 st->codecpar->codec_tag = bytestream_get_le32(pp);
2007 if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
2008 mpegts_find_stream_type(st, st->codecpar->codec_tag, METADATA_types);
2009 }
2010 break;
2011 case 0x7f: /* DVB extension descriptor */
2012 ext_desc_tag = get8(pp, desc_end);
2013 if (ext_desc_tag < 0)
2014 return AVERROR_INVALIDDATA;
2015 if (st->codecpar->codec_id == AV_CODEC_ID_OPUS &&
2016 ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
2017 if (!st->codecpar->extradata) {
2018 st->codecpar->extradata = av_mallocz(sizeof(opus_default_extradata) +
2019 AV_INPUT_BUFFER_PADDING_SIZE);
2020 if (!st->codecpar->extradata)
2021 return AVERROR(ENOMEM);
2022
2023 st->codecpar->extradata_size = sizeof(opus_default_extradata);
2024 memcpy(st->codecpar->extradata, opus_default_extradata, sizeof(opus_default_extradata));
2025
2026 channel_config_code = get8(pp, desc_end);
2027 if (channel_config_code < 0)
2028 return AVERROR_INVALIDDATA;
2029 if (channel_config_code <= 0x8) {
2030 st->codecpar->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
2031 AV_WL32(&st->codecpar->extradata[12], 48000);
2032 st->codecpar->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
2033 st->codecpar->extradata[19] = opus_stream_cnt[channel_config_code];
2034 st->codecpar->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
2035 memcpy(&st->codecpar->extradata[21], opus_channel_map[channels - 1], channels);
2036 } else {
2037 avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
2038 }
2039 st->need_parsing = AVSTREAM_PARSE_FULL;
2040 st->internal->need_context_update = 1;
2041 }
2042 }
2043 if (ext_desc_tag == 0x06) { /* supplementary audio descriptor */
2044 int flags;
2045
2046 if (desc_len < 1)
2047 return AVERROR_INVALIDDATA;
2048 flags = get8(pp, desc_end);
2049
2050 if ((flags & 0x80) == 0) /* mix_type */
2051 st->disposition |= AV_DISPOSITION_DEPENDENT;
2052
2053 switch ((flags >> 2) & 0x1F) { /* editorial_classification */
2054 case 0x01:
2055 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
2056 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2057 break;
2058 case 0x02:
2059 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
2060 break;
2061 case 0x03:
2062 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
2063 break;
2064 }
2065
2066 if (flags & 0x01) { /* language_code_present */
2067 if (desc_len < 4)
2068 return AVERROR_INVALIDDATA;
2069 language[0] = get8(pp, desc_end);
2070 language[1] = get8(pp, desc_end);
2071 language[2] = get8(pp, desc_end);
2072 language[3] = 0;
2073
2074 /* This language always has to override a possible
2075 * ISO 639 language descriptor language */
2076 if (language[0])
2077 av_dict_set(&st->metadata, "language", language, 0);
2078 }
2079 }
2080 break;
2081 case 0x6a: /* ac-3_descriptor */
2082 {
2083 int component_type_flag = get8(pp, desc_end) & (1 << 7);
2084 if (component_type_flag) {
2085 int component_type = get8(pp, desc_end);
2086 int service_type_mask = 0x38; // 0b00111000
2087 int service_type = ((component_type & service_type_mask) >> 3);
2088 if (service_type == 0x02 /* 0b010 */) {
2089 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2090 av_log(ts ? ts->stream : fc, AV_LOG_DEBUG, "New track disposition for id %u: %u\n", st->id, st->disposition);
2091 }
2092 }
2093 }
2094 break;
2095 case 0x7a: /* enhanced_ac-3_descriptor */
2096 {
2097 int component_type_flag = get8(pp, desc_end) & (1 << 7);
2098 if (component_type_flag) {
2099 int component_type = get8(pp, desc_end);
2100 int service_type_mask = 0x38; // 0b00111000
2101 int service_type = ((component_type & service_type_mask) >> 3);
2102 if (service_type == 0x02 /* 0b010 */) {
2103 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2104 av_log(ts ? ts->stream : fc, AV_LOG_DEBUG, "New track disposition for id %u: %u\n", st->id, st->disposition);
2105 }
2106 }
2107 }
2108 break;
2109 case 0xfd: /* ARIB data coding type descriptor */
2110 // STD-B24, fascicle 3, chapter 4 defines private_stream_1
2111 // for captions
2112 if (stream_type == STREAM_TYPE_PRIVATE_DATA) {
2113 // This structure is defined in STD-B10, part 1, listing 5.4 and
2114 // part 2, 6.2.20).
2115 // Listing of data_component_ids is in STD-B10, part 2, Annex J.
2116 // Component tag limits are documented in TR-B14, fascicle 2,
2117 // Vol. 3, Section 2, 4.2.8.1
2118 int actual_component_tag = st->stream_identifier - 1;
2119 int picked_profile = FF_PROFILE_UNKNOWN;
2120 int data_component_id = get16(pp, desc_end);
2121 if (data_component_id < 0)
2122 return AVERROR_INVALIDDATA;
2123
2124 switch (data_component_id) {
2125 case 0x0008:
2126 // [0x30..0x37] are component tags utilized for
2127 // non-mobile captioning service ("profile A").
2128 if (actual_component_tag >= 0x30 &&
2129 actual_component_tag <= 0x37) {
2130 picked_profile = FF_PROFILE_ARIB_PROFILE_A;
2131 }
2132 break;
2133 case 0x0012:
2134 // component tag 0x87 signifies a mobile/partial reception
2135 // (1seg) captioning service ("profile C").
2136 if (actual_component_tag == 0x87) {
2137 picked_profile = FF_PROFILE_ARIB_PROFILE_C;
2138 }
2139 break;
2140 default:
2141 break;
2142 }
2143
2144 if (picked_profile == FF_PROFILE_UNKNOWN)
2145 break;
2146
2147 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2148 st->codecpar->codec_id = AV_CODEC_ID_ARIB_CAPTION;
2149 st->codecpar->profile = picked_profile;
2150 st->internal->request_probe = 0;
2151 }
2152 break;
2153 case 0xb0: /* DOVI video stream descriptor */
2154 {
2155 uint32_t buf;
2156 AVDOVIDecoderConfigurationRecord *dovi;
2157 size_t dovi_size;
2158 int ret;
2159 if (desc_end - *pp < 4) // (8 + 8 + 7 + 6 + 1 + 1 + 1) / 8
2160 return AVERROR_INVALIDDATA;
2161
2162 dovi = av_dovi_alloc(&dovi_size);
2163 if (!dovi)
2164 return AVERROR(ENOMEM);
2165
2166 dovi->dv_version_major = get8(pp, desc_end);
2167 dovi->dv_version_minor = get8(pp, desc_end);
2168 buf = get16(pp, desc_end);
2169 dovi->dv_profile = (buf >> 9) & 0x7f; // 7 bits
2170 dovi->dv_level = (buf >> 3) & 0x3f; // 6 bits
2171 dovi->rpu_present_flag = (buf >> 2) & 0x01; // 1 bit
2172 dovi->el_present_flag = (buf >> 1) & 0x01; // 1 bit
2173 dovi->bl_present_flag = buf & 0x01; // 1 bit
2174 if (desc_end - *pp >= 20) { // 4 + 4 * 4
2175 buf = get8(pp, desc_end);
2176 dovi->dv_bl_signal_compatibility_id = (buf >> 4) & 0x0f; // 4 bits
2177 } else {
2178 // 0 stands for None
2179 // Dolby Vision V1.2.93 profiles and levels
2180 dovi->dv_bl_signal_compatibility_id = 0;
2181 }
2182
2183 ret = av_stream_add_side_data(st, AV_PKT_DATA_DOVI_CONF,
2184 (uint8_t *)dovi, dovi_size);
2185 if (ret < 0) {
2186 av_free(dovi);
2187 return ret;
2188 }
2189
2190 av_log(fc, AV_LOG_TRACE, "DOVI, version: %d.%d, profile: %d, level: %d, "
2191 "rpu flag: %d, el flag: %d, bl flag: %d, compatibility id: %d\n",
2192 dovi->dv_version_major, dovi->dv_version_minor,
2193 dovi->dv_profile, dovi->dv_level,
2194 dovi->rpu_present_flag,
2195 dovi->el_present_flag,
2196 dovi->bl_present_flag,
2197 dovi->dv_bl_signal_compatibility_id);
2198 }
2199 break;
2200 default:
2201 break;
2202 }
2203 *pp = desc_end;
2204 return 0;
2205 }
2206
find_matching_stream(MpegTSContext * ts,int pid,unsigned int programid,int stream_identifier,int pmt_stream_idx,struct Program * p)2207 static AVStream *find_matching_stream(MpegTSContext *ts, int pid, unsigned int programid,
2208 int stream_identifier, int pmt_stream_idx, struct Program *p)
2209 {
2210 AVFormatContext *s = ts->stream;
2211 int i;
2212 AVStream *found = NULL;
2213
2214 if (stream_identifier) { /* match based on "stream identifier descriptor" if present */
2215 for (i = 0; i < p->nb_streams; i++) {
2216 if (p->streams[i].stream_identifier == stream_identifier)
2217 if (!found || pmt_stream_idx == i) /* fallback to idx based guess if multiple streams have the same identifier */
2218 found = s->streams[p->streams[i].idx];
2219 }
2220 } else if (pmt_stream_idx < p->nb_streams) { /* match based on position within the PMT */
2221 found = s->streams[p->streams[pmt_stream_idx].idx];
2222 }
2223
2224 if (found) {
2225 av_log(ts->stream, AV_LOG_VERBOSE,
2226 "re-using existing %s stream %d (pid=0x%x) for new pid=0x%x\n",
2227 av_get_media_type_string(found->codecpar->codec_type),
2228 i, found->id, pid);
2229 }
2230
2231 return found;
2232 }
2233
parse_stream_identifier_desc(const uint8_t * p,const uint8_t * p_end)2234 static int parse_stream_identifier_desc(const uint8_t *p, const uint8_t *p_end)
2235 {
2236 const uint8_t **pp = &p;
2237 const uint8_t *desc_list_end;
2238 const uint8_t *desc_end;
2239 int desc_list_len;
2240 int desc_len, desc_tag;
2241
2242 desc_list_len = get16(pp, p_end);
2243 if (desc_list_len < 0)
2244 return -1;
2245 desc_list_len &= 0xfff;
2246 desc_list_end = p + desc_list_len;
2247 if (desc_list_end > p_end)
2248 return -1;
2249
2250 while (1) {
2251 desc_tag = get8(pp, desc_list_end);
2252 if (desc_tag < 0)
2253 return -1;
2254 desc_len = get8(pp, desc_list_end);
2255 if (desc_len < 0)
2256 return -1;
2257 desc_end = *pp + desc_len;
2258 if (desc_end > desc_list_end)
2259 return -1;
2260
2261 if (desc_tag == 0x52) {
2262 return get8(pp, desc_end);
2263 }
2264 *pp = desc_end;
2265 }
2266
2267 return -1;
2268 }
2269
is_pes_stream(int stream_type,uint32_t prog_reg_desc)2270 static int is_pes_stream(int stream_type, uint32_t prog_reg_desc)
2271 {
2272 return !(stream_type == 0x13 ||
2273 (stream_type == 0x86 && prog_reg_desc == AV_RL32("CUEI")) );
2274 }
2275
pmt_cb(MpegTSFilter * filter,const uint8_t * section,int section_len)2276 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2277 {
2278 MpegTSContext *ts = filter->u.section_filter.opaque;
2279 MpegTSSectionFilter *tssf = &filter->u.section_filter;
2280 struct Program old_program;
2281 SectionHeader h1, *h = &h1;
2282 PESContext *pes;
2283 AVStream *st;
2284 const uint8_t *p, *p_end, *desc_list_end;
2285 int program_info_length, pcr_pid, pid, stream_type;
2286 int desc_list_len;
2287 uint32_t prog_reg_desc = 0; /* registration descriptor */
2288 int stream_identifier = -1;
2289 struct Program *prg;
2290
2291 int mp4_descr_count = 0;
2292 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
2293 int i;
2294
2295 av_log(ts->stream, AV_LOG_TRACE, "PMT: len %i\n", section_len);
2296 hex_dump_debug(ts->stream, section, section_len);
2297
2298 p_end = section + section_len - 4;
2299 p = section;
2300 if (parse_section_header(h, &p, p_end) < 0)
2301 return;
2302 if (h->tid != PMT_TID)
2303 return;
2304 if (skip_identical(h, tssf))
2305 return;
2306
2307 av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x sec_num=%d/%d version=%d tid=%d\n",
2308 h->id, h->sec_num, h->last_sec_num, h->version, h->tid);
2309
2310 if (!ts->scan_all_pmts && ts->skip_changes)
2311 return;
2312
2313 prg = get_program(ts, h->id);
2314 if (prg)
2315 old_program = *prg;
2316 else
2317 clear_program(&old_program);
2318
2319 if (ts->skip_unknown_pmt && !prg)
2320 return;
2321 if (prg && prg->nb_pids && prg->pids[0] != ts->current_pid)
2322 return;
2323 if (!ts->skip_clear)
2324 clear_avprogram(ts, h->id);
2325 clear_program(prg);
2326 add_pid_to_program(prg, ts->current_pid);
2327
2328 pcr_pid = get16(&p, p_end);
2329 if (pcr_pid < 0)
2330 return;
2331 pcr_pid &= 0x1fff;
2332 add_pid_to_program(prg, pcr_pid);
2333 update_av_program_info(ts->stream, h->id, pcr_pid, h->version);
2334
2335 av_log(ts->stream, AV_LOG_TRACE, "pcr_pid=0x%x\n", pcr_pid);
2336
2337 program_info_length = get16(&p, p_end);
2338 if (program_info_length < 0)
2339 return;
2340 program_info_length &= 0xfff;
2341 while (program_info_length >= 2) {
2342 uint8_t tag, len;
2343 tag = get8(&p, p_end);
2344 len = get8(&p, p_end);
2345
2346 av_log(ts->stream, AV_LOG_TRACE, "program tag: 0x%02x len=%d\n", tag, len);
2347
2348 if (len > program_info_length - 2)
2349 // something else is broken, exit the program_descriptors_loop
2350 break;
2351 program_info_length -= len + 2;
2352 if (tag == IOD_DESCRIPTOR) {
2353 get8(&p, p_end); // scope
2354 get8(&p, p_end); // label
2355 len -= 2;
2356 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
2357 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
2358 } else if (tag == REGISTRATION_DESCRIPTOR && len >= 4) {
2359 prog_reg_desc = bytestream_get_le32(&p);
2360 len -= 4;
2361 }
2362 p += len;
2363 }
2364 p += program_info_length;
2365 if (p >= p_end)
2366 goto out;
2367
2368 // stop parsing after pmt, we found header
2369 if (!ts->pkt)
2370 ts->stop_parse = 2;
2371
2372 if (prg)
2373 prg->pmt_found = 1;
2374
2375 for (i = 0; i < MAX_STREAMS_PER_PROGRAM; i++) {
2376 st = 0;
2377 pes = NULL;
2378 stream_type = get8(&p, p_end);
2379 if (stream_type < 0)
2380 break;
2381 pid = get16(&p, p_end);
2382 if (pid < 0)
2383 goto out;
2384 pid &= 0x1fff;
2385 if (pid == ts->current_pid)
2386 goto out;
2387
2388 stream_identifier = parse_stream_identifier_desc(p, p_end) + 1;
2389
2390 /* now create stream */
2391 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
2392 pes = ts->pids[pid]->u.pes_filter.opaque;
2393 if (ts->merge_pmt_versions && !pes->st) {
2394 st = find_matching_stream(ts, pid, h->id, stream_identifier, i, &old_program);
2395 if (st) {
2396 pes->st = st;
2397 pes->stream_type = stream_type;
2398 pes->merged_st = 1;
2399 }
2400 }
2401 if (!pes->st) {
2402 pes->st = avformat_new_stream(pes->stream, NULL);
2403 if (!pes->st)
2404 goto out;
2405 pes->st->id = pes->pid;
2406 }
2407 st = pes->st;
2408 } else if (is_pes_stream(stream_type, prog_reg_desc)) {
2409 if (ts->pids[pid])
2410 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
2411 pes = add_pes_stream(ts, pid, pcr_pid);
2412 if (ts->merge_pmt_versions && pes && !pes->st) {
2413 st = find_matching_stream(ts, pid, h->id, stream_identifier, i, &old_program);
2414 if (st) {
2415 pes->st = st;
2416 pes->stream_type = stream_type;
2417 pes->merged_st = 1;
2418 }
2419 }
2420 if (pes && !pes->st) {
2421 st = avformat_new_stream(pes->stream, NULL);
2422 if (!st)
2423 goto out;
2424 st->id = pes->pid;
2425 }
2426 } else {
2427 int idx = ff_find_stream_index(ts->stream, pid);
2428 if (idx >= 0) {
2429 st = ts->stream->streams[idx];
2430 }
2431 if (ts->merge_pmt_versions && !st) {
2432 st = find_matching_stream(ts, pid, h->id, stream_identifier, i, &old_program);
2433 }
2434 if (!st) {
2435 st = avformat_new_stream(ts->stream, NULL);
2436 if (!st)
2437 goto out;
2438 st->id = pid;
2439 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
2440 if (stream_type == 0x86 && prog_reg_desc == AV_RL32("CUEI")) {
2441 mpegts_find_stream_type(st, stream_type, SCTE_types);
2442 mpegts_open_section_filter(ts, pid, scte_data_cb, ts, 1);
2443 }
2444 }
2445 }
2446
2447 if (!st)
2448 goto out;
2449
2450 if (pes && !pes->stream_type)
2451 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
2452
2453 add_pid_to_program(prg, pid);
2454 if (prg) {
2455 prg->streams[i].idx = st->index;
2456 prg->streams[i].stream_identifier = stream_identifier;
2457 prg->nb_streams++;
2458 }
2459
2460 av_program_add_stream_index(ts->stream, h->id, st->index);
2461
2462 desc_list_len = get16(&p, p_end);
2463 if (desc_list_len < 0)
2464 goto out;
2465 desc_list_len &= 0xfff;
2466 desc_list_end = p + desc_list_len;
2467 if (desc_list_end > p_end)
2468 goto out;
2469 for (;;) {
2470 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
2471 desc_list_end, mp4_descr,
2472 mp4_descr_count, pid, ts) < 0)
2473 break;
2474
2475 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
2476 stream_type == 0x83 && pes->sub_st) {
2477 av_program_add_stream_index(ts->stream, h->id,
2478 pes->sub_st->index);
2479 pes->sub_st->codecpar->codec_tag = st->codecpar->codec_tag;
2480 }
2481 }
2482 p = desc_list_end;
2483 }
2484
2485 if (!ts->pids[pcr_pid])
2486 mpegts_open_pcr_filter(ts, pcr_pid);
2487
2488 out:
2489 for (i = 0; i < mp4_descr_count; i++)
2490 av_free(mp4_descr[i].dec_config_descr);
2491 }
2492
pat_cb(MpegTSFilter * filter,const uint8_t * section,int section_len)2493 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2494 {
2495 MpegTSContext *ts = filter->u.section_filter.opaque;
2496 MpegTSSectionFilter *tssf = &filter->u.section_filter;
2497 SectionHeader h1, *h = &h1;
2498 const uint8_t *p, *p_end;
2499 int sid, pmt_pid;
2500 int nb_prg = 0;
2501 AVProgram *program;
2502
2503 av_log(ts->stream, AV_LOG_TRACE, "PAT:\n");
2504 hex_dump_debug(ts->stream, section, section_len);
2505
2506 p_end = section + section_len - 4;
2507 p = section;
2508 if (parse_section_header(h, &p, p_end) < 0)
2509 return;
2510 if (h->tid != PAT_TID)
2511 return;
2512 if (ts->skip_changes)
2513 return;
2514
2515 if (skip_identical(h, tssf))
2516 return;
2517 ts->stream->ts_id = h->id;
2518
2519 for (;;) {
2520 sid = get16(&p, p_end);
2521 if (sid < 0)
2522 break;
2523 pmt_pid = get16(&p, p_end);
2524 if (pmt_pid < 0)
2525 break;
2526 pmt_pid &= 0x1fff;
2527
2528 if (pmt_pid == ts->current_pid)
2529 break;
2530
2531 av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
2532
2533 if (sid == 0x0000) {
2534 /* NIT info */
2535 } else {
2536 MpegTSFilter *fil = ts->pids[pmt_pid];
2537 struct Program *prg;
2538 program = av_new_program(ts->stream, sid);
2539 if (program) {
2540 program->program_num = sid;
2541 program->pmt_pid = pmt_pid;
2542 }
2543 if (fil)
2544 if ( fil->type != MPEGTS_SECTION
2545 || fil->pid != pmt_pid
2546 || fil->u.section_filter.section_cb != pmt_cb)
2547 mpegts_close_filter(ts, ts->pids[pmt_pid]);
2548
2549 if (!ts->pids[pmt_pid])
2550 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
2551 prg = add_program(ts, sid);
2552 if (prg) {
2553 unsigned prg_idx = prg - ts->prg;
2554 if (prg->nb_pids && prg->pids[0] != pmt_pid)
2555 clear_program(prg);
2556 add_pid_to_program(prg, pmt_pid);
2557 if (prg_idx > nb_prg)
2558 FFSWAP(struct Program, ts->prg[nb_prg], ts->prg[prg_idx]);
2559 if (prg_idx >= nb_prg)
2560 nb_prg++;
2561 }
2562 }
2563 }
2564 ts->nb_prg = nb_prg;
2565
2566 if (sid < 0) {
2567 int i,j;
2568 for (j=0; j<ts->stream->nb_programs; j++) {
2569 for (i = 0; i < ts->nb_prg; i++)
2570 if (ts->prg[i].id == ts->stream->programs[j]->id)
2571 break;
2572 if (i==ts->nb_prg && !ts->skip_clear)
2573 clear_avprogram(ts, ts->stream->programs[j]->id);
2574 }
2575 }
2576 }
2577
eit_cb(MpegTSFilter * filter,const uint8_t * section,int section_len)2578 static void eit_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2579 {
2580 MpegTSContext *ts = filter->u.section_filter.opaque;
2581 const uint8_t *p, *p_end;
2582 SectionHeader h1, *h = &h1;
2583
2584 /*
2585 * Sometimes we receive EPG packets but SDT table do not have
2586 * eit_pres_following or eit_sched turned on, so we open EPG
2587 * stream directly here.
2588 */
2589 if (!ts->epg_stream) {
2590 ts->epg_stream = avformat_new_stream(ts->stream, NULL);
2591 if (!ts->epg_stream)
2592 return;
2593 ts->epg_stream->id = EIT_PID;
2594 ts->epg_stream->codecpar->codec_type = AVMEDIA_TYPE_DATA;
2595 ts->epg_stream->codecpar->codec_id = AV_CODEC_ID_EPG;
2596 }
2597
2598 if (ts->epg_stream->discard == AVDISCARD_ALL)
2599 return;
2600
2601 p_end = section + section_len - 4;
2602 p = section;
2603
2604 if (parse_section_header(h, &p, p_end) < 0)
2605 return;
2606 if (h->tid < EIT_TID || h->tid > OEITS_END_TID)
2607 return;
2608
2609 av_log(ts->stream, AV_LOG_TRACE, "EIT: tid received = %.02x\n", h->tid);
2610
2611 /**
2612 * Service_id 0xFFFF is reserved, it indicates that the current EIT table
2613 * is scrambled.
2614 */
2615 if (h->id == 0xFFFF) {
2616 av_log(ts->stream, AV_LOG_TRACE, "Scrambled EIT table received.\n");
2617 return;
2618 }
2619
2620 /**
2621 * In case we receive an EPG packet before mpegts context is fully
2622 * initialized.
2623 */
2624 if (!ts->pkt)
2625 return;
2626
2627 new_data_packet(section, section_len, ts->pkt);
2628 ts->pkt->stream_index = ts->epg_stream->index;
2629 ts->stop_parse = 1;
2630 }
2631
sdt_cb(MpegTSFilter * filter,const uint8_t * section,int section_len)2632 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
2633 {
2634 MpegTSContext *ts = filter->u.section_filter.opaque;
2635 MpegTSSectionFilter *tssf = &filter->u.section_filter;
2636 SectionHeader h1, *h = &h1;
2637 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
2638 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
2639 char *name, *provider_name;
2640
2641 av_log(ts->stream, AV_LOG_TRACE, "SDT:\n");
2642 hex_dump_debug(ts->stream, section, section_len);
2643
2644 p_end = section + section_len - 4;
2645 p = section;
2646 if (parse_section_header(h, &p, p_end) < 0)
2647 return;
2648 if (h->tid != SDT_TID)
2649 return;
2650 if (ts->skip_changes)
2651 return;
2652 if (skip_identical(h, tssf))
2653 return;
2654
2655 onid = get16(&p, p_end);
2656 if (onid < 0)
2657 return;
2658 val = get8(&p, p_end);
2659 if (val < 0)
2660 return;
2661 for (;;) {
2662 sid = get16(&p, p_end);
2663 if (sid < 0)
2664 break;
2665 val = get8(&p, p_end);
2666 if (val < 0)
2667 break;
2668 desc_list_len = get16(&p, p_end);
2669 if (desc_list_len < 0)
2670 break;
2671 desc_list_len &= 0xfff;
2672 desc_list_end = p + desc_list_len;
2673 if (desc_list_end > p_end)
2674 break;
2675 for (;;) {
2676 desc_tag = get8(&p, desc_list_end);
2677 if (desc_tag < 0)
2678 break;
2679 desc_len = get8(&p, desc_list_end);
2680 desc_end = p + desc_len;
2681 if (desc_len < 0 || desc_end > desc_list_end)
2682 break;
2683
2684 av_log(ts->stream, AV_LOG_TRACE, "tag: 0x%02x len=%d\n",
2685 desc_tag, desc_len);
2686
2687 switch (desc_tag) {
2688 case 0x48:
2689 service_type = get8(&p, p_end);
2690 if (service_type < 0)
2691 break;
2692 provider_name = getstr8(&p, p_end);
2693 if (!provider_name)
2694 break;
2695 name = getstr8(&p, p_end);
2696 if (name) {
2697 AVProgram *program = av_new_program(ts->stream, sid);
2698 if (program) {
2699 av_dict_set(&program->metadata, "service_name", name, 0);
2700 av_dict_set(&program->metadata, "service_provider",
2701 provider_name, 0);
2702 }
2703 }
2704 av_free(name);
2705 av_free(provider_name);
2706 break;
2707 default:
2708 break;
2709 }
2710 p = desc_end;
2711 }
2712 p = desc_list_end;
2713 }
2714 }
2715
2716 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
2717 const uint8_t *packet);
2718
2719 /* handle one TS packet */
handle_packet(MpegTSContext * ts,const uint8_t * packet,int64_t pos)2720 static int handle_packet(MpegTSContext *ts, const uint8_t *packet, int64_t pos)
2721 {
2722 MpegTSFilter *tss;
2723 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
2724 has_adaptation, has_payload;
2725 const uint8_t *p, *p_end;
2726
2727 pid = AV_RB16(packet + 1) & 0x1fff;
2728 is_start = packet[1] & 0x40;
2729 tss = ts->pids[pid];
2730 if (ts->auto_guess && !tss && is_start) {
2731 add_pes_stream(ts, pid, -1);
2732 tss = ts->pids[pid];
2733 }
2734 if (!tss)
2735 return 0;
2736 if (is_start)
2737 tss->discard = discard_pid(ts, pid);
2738 if (tss->discard)
2739 return 0;
2740 ts->current_pid = pid;
2741
2742 afc = (packet[3] >> 4) & 3;
2743 if (afc == 0) /* reserved value */
2744 return 0;
2745 has_adaptation = afc & 2;
2746 has_payload = afc & 1;
2747 is_discontinuity = has_adaptation &&
2748 packet[4] != 0 && /* with length > 0 */
2749 (packet[5] & 0x80); /* and discontinuity indicated */
2750
2751 /* continuity check (currently not used) */
2752 cc = (packet[3] & 0xf);
2753 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
2754 cc_ok = pid == 0x1FFF || // null packet PID
2755 is_discontinuity ||
2756 tss->last_cc < 0 ||
2757 expected_cc == cc;
2758
2759 tss->last_cc = cc;
2760 if (!cc_ok) {
2761 av_log(ts->stream, AV_LOG_DEBUG,
2762 "Continuity check failed for pid %d expected %d got %d\n",
2763 pid, expected_cc, cc);
2764 if (tss->type == MPEGTS_PES) {
2765 PESContext *pc = tss->u.pes_filter.opaque;
2766 pc->flags |= AV_PKT_FLAG_CORRUPT;
2767 }
2768 }
2769
2770 if (packet[1] & 0x80) {
2771 av_log(ts->stream, AV_LOG_DEBUG, "Packet had TEI flag set; marking as corrupt\n");
2772 if (tss->type == MPEGTS_PES) {
2773 PESContext *pc = tss->u.pes_filter.opaque;
2774 pc->flags |= AV_PKT_FLAG_CORRUPT;
2775 }
2776 }
2777
2778 p = packet + 4;
2779 if (has_adaptation) {
2780 int64_t pcr_h;
2781 int pcr_l;
2782 if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
2783 tss->last_pcr = pcr_h * 300 + pcr_l;
2784 /* skip adaptation field */
2785 p += p[0] + 1;
2786 }
2787 /* if past the end of packet, ignore */
2788 p_end = packet + TS_PACKET_SIZE;
2789 if (p >= p_end || !has_payload)
2790 return 0;
2791
2792 if (pos >= 0) {
2793 av_assert0(pos >= TS_PACKET_SIZE);
2794 ts->pos47_full = pos - TS_PACKET_SIZE;
2795 }
2796
2797 if (tss->type == MPEGTS_SECTION) {
2798 if (is_start) {
2799 /* pointer field present */
2800 len = *p++;
2801 if (len > p_end - p)
2802 return 0;
2803 if (len && cc_ok) {
2804 /* write remaining section bytes */
2805 write_section_data(ts, tss,
2806 p, len, 0);
2807 /* check whether filter has been closed */
2808 if (!ts->pids[pid])
2809 return 0;
2810 }
2811 p += len;
2812 if (p < p_end) {
2813 write_section_data(ts, tss,
2814 p, p_end - p, 1);
2815 }
2816 } else {
2817 if (cc_ok) {
2818 write_section_data(ts, tss,
2819 p, p_end - p, 0);
2820 }
2821 }
2822
2823 // stop find_stream_info from waiting for more streams
2824 // when all programs have received a PMT
2825 if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
2826 int i;
2827 for (i = 0; i < ts->nb_prg; i++) {
2828 if (!ts->prg[i].pmt_found)
2829 break;
2830 }
2831 if (i == ts->nb_prg && ts->nb_prg > 0) {
2832 int types = 0;
2833 for (i = 0; i < ts->stream->nb_streams; i++) {
2834 AVStream *st = ts->stream->streams[i];
2835 if (st->codecpar->codec_type >= 0)
2836 types |= 1<<st->codecpar->codec_type;
2837 }
2838 if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
2839 av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
2840 ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
2841 }
2842 }
2843 }
2844
2845 } else {
2846 int ret;
2847 // Note: The position here points actually behind the current packet.
2848 if (tss->type == MPEGTS_PES) {
2849 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
2850 pos - ts->raw_packet_size)) < 0)
2851 return ret;
2852 }
2853 }
2854
2855 return 0;
2856 }
2857
mpegts_resync(AVFormatContext * s,int seekback,const uint8_t * current_packet)2858 static int mpegts_resync(AVFormatContext *s, int seekback, const uint8_t *current_packet)
2859 {
2860 MpegTSContext *ts = s->priv_data;
2861 AVIOContext *pb = s->pb;
2862 int c, i;
2863 uint64_t pos = avio_tell(pb);
2864 int64_t back = FFMIN(seekback, pos);
2865
2866 //Special case for files like 01c56b0dc1.ts
2867 if (current_packet[0] == 0x80 && current_packet[12] == 0x47 && pos >= TS_PACKET_SIZE) {
2868 avio_seek(pb, 12 - TS_PACKET_SIZE, SEEK_CUR);
2869 return 0;
2870 }
2871
2872 avio_seek(pb, -back, SEEK_CUR);
2873
2874 for (i = 0; i < ts->resync_size; i++) {
2875 c = avio_r8(pb);
2876 if (avio_feof(pb))
2877 return AVERROR_EOF;
2878 if (c == 0x47) {
2879 int new_packet_size, ret;
2880 avio_seek(pb, -1, SEEK_CUR);
2881 pos = avio_tell(pb);
2882 ret = ffio_ensure_seekback(pb, PROBE_PACKET_MAX_BUF);
2883 if (ret < 0)
2884 return ret;
2885 new_packet_size = get_packet_size(s);
2886 if (new_packet_size > 0 && new_packet_size != ts->raw_packet_size) {
2887 av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", new_packet_size);
2888 ts->raw_packet_size = new_packet_size;
2889 }
2890 avio_seek(pb, pos, SEEK_SET);
2891 return 0;
2892 }
2893 }
2894 av_log(s, AV_LOG_ERROR,
2895 "max resync size reached, could not find sync byte\n");
2896 /* no sync found */
2897 return AVERROR_INVALIDDATA;
2898 }
2899
2900 /* return AVERROR_something if error or EOF. Return 0 if OK. */
read_packet(AVFormatContext * s,uint8_t * buf,int raw_packet_size,const uint8_t ** data)2901 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
2902 const uint8_t **data)
2903 {
2904 AVIOContext *pb = s->pb;
2905 int len;
2906
2907 for (;;) {
2908 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
2909 if (len != TS_PACKET_SIZE)
2910 return len < 0 ? len : AVERROR_EOF;
2911 /* check packet sync byte */
2912 if ((*data)[0] != 0x47) {
2913 /* find a new packet start */
2914
2915 if (mpegts_resync(s, raw_packet_size, *data) < 0)
2916 return AVERROR(EAGAIN);
2917 else
2918 continue;
2919 } else {
2920 break;
2921 }
2922 }
2923 return 0;
2924 }
2925
finished_reading_packet(AVFormatContext * s,int raw_packet_size)2926 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
2927 {
2928 AVIOContext *pb = s->pb;
2929 int skip = raw_packet_size - TS_PACKET_SIZE;
2930 if (skip > 0)
2931 avio_skip(pb, skip);
2932 }
2933
handle_packets(MpegTSContext * ts,int64_t nb_packets)2934 static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
2935 {
2936 AVFormatContext *s = ts->stream;
2937 uint8_t packet[TS_PACKET_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
2938 const uint8_t *data;
2939 int64_t packet_num;
2940 int ret = 0;
2941
2942 if (avio_tell(s->pb) != ts->last_pos) {
2943 int i;
2944 av_log(ts->stream, AV_LOG_TRACE, "Skipping after seek\n");
2945 /* seek detected, flush pes buffer */
2946 for (i = 0; i < NB_PID_MAX; i++) {
2947 if (ts->pids[i]) {
2948 if (ts->pids[i]->type == MPEGTS_PES) {
2949 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2950 av_buffer_unref(&pes->buffer);
2951 pes->data_index = 0;
2952 pes->state = MPEGTS_SKIP; /* skip until pes header */
2953 } else if (ts->pids[i]->type == MPEGTS_SECTION) {
2954 ts->pids[i]->u.section_filter.last_ver = -1;
2955 }
2956 ts->pids[i]->last_cc = -1;
2957 ts->pids[i]->last_pcr = -1;
2958 }
2959 }
2960 }
2961
2962 ts->stop_parse = 0;
2963 packet_num = 0;
2964 memset(packet + TS_PACKET_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
2965 for (;;) {
2966 packet_num++;
2967 if (nb_packets != 0 && packet_num >= nb_packets ||
2968 ts->stop_parse > 1) {
2969 ret = AVERROR(EAGAIN);
2970 break;
2971 }
2972 if (ts->stop_parse > 0)
2973 break;
2974
2975 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2976 if (ret != 0)
2977 break;
2978 ret = handle_packet(ts, data, avio_tell(s->pb));
2979 finished_reading_packet(s, ts->raw_packet_size);
2980 if (ret != 0)
2981 break;
2982 }
2983 ts->last_pos = avio_tell(s->pb);
2984 return ret;
2985 }
2986
mpegts_probe(const AVProbeData * p)2987 static int mpegts_probe(const AVProbeData *p)
2988 {
2989 const int size = p->buf_size;
2990 int maxscore = 0;
2991 int sumscore = 0;
2992 int i;
2993 int check_count = size / TS_FEC_PACKET_SIZE;
2994 #define CHECK_COUNT 10
2995 #define CHECK_BLOCK 100
2996
2997 if (!check_count)
2998 return 0;
2999
3000 for (i = 0; i<check_count; i+=CHECK_BLOCK) {
3001 int left = FFMIN(check_count - i, CHECK_BLOCK);
3002 int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , 1);
3003 int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, 1);
3004 int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , 1);
3005 score = FFMAX3(score, dvhs_score, fec_score);
3006 sumscore += score;
3007 maxscore = FFMAX(maxscore, score);
3008 }
3009
3010 sumscore = sumscore * CHECK_COUNT / check_count;
3011 maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
3012
3013 ff_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
3014
3015 if (check_count > CHECK_COUNT && sumscore > 6) {
3016 return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT;
3017 } else if (check_count >= CHECK_COUNT && sumscore > 6) {
3018 return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
3019 } else if (check_count >= CHECK_COUNT && maxscore > 6) {
3020 return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
3021 } else if (sumscore > 6) {
3022 return 2;
3023 } else {
3024 return 0;
3025 }
3026 }
3027
3028 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
3029 * (-1) if not available */
parse_pcr(int64_t * ppcr_high,int * ppcr_low,const uint8_t * packet)3030 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
3031 {
3032 int afc, len, flags;
3033 const uint8_t *p;
3034 unsigned int v;
3035
3036 afc = (packet[3] >> 4) & 3;
3037 if (afc <= 1)
3038 return AVERROR_INVALIDDATA;
3039 p = packet + 4;
3040 len = p[0];
3041 p++;
3042 if (len == 0)
3043 return AVERROR_INVALIDDATA;
3044 flags = *p++;
3045 len--;
3046 if (!(flags & 0x10))
3047 return AVERROR_INVALIDDATA;
3048 if (len < 6)
3049 return AVERROR_INVALIDDATA;
3050 v = AV_RB32(p);
3051 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
3052 *ppcr_low = ((p[4] & 1) << 8) | p[5];
3053 return 0;
3054 }
3055
seek_back(AVFormatContext * s,AVIOContext * pb,int64_t pos)3056 static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
3057
3058 /* NOTE: We attempt to seek on non-seekable files as well, as the
3059 * probe buffer usually is big enough. Only warn if the seek failed
3060 * on files where the seek should work. */
3061 if (avio_seek(pb, pos, SEEK_SET) < 0)
3062 av_log(s, (pb->seekable & AVIO_SEEKABLE_NORMAL) ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
3063 }
3064
mpegts_read_header(AVFormatContext * s)3065 static int mpegts_read_header(AVFormatContext *s)
3066 {
3067 MpegTSContext *ts = s->priv_data;
3068 AVIOContext *pb = s->pb;
3069 int64_t pos, probesize = s->probesize;
3070 int64_t seekback = FFMAX(s->probesize, (int64_t)ts->resync_size + PROBE_PACKET_MAX_BUF);
3071
3072 s->internal->prefer_codec_framerate = 1;
3073
3074 if (ffio_ensure_seekback(pb, seekback) < 0)
3075 av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
3076
3077 pos = avio_tell(pb);
3078 ts->raw_packet_size = get_packet_size(s);
3079 if (ts->raw_packet_size <= 0) {
3080 av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
3081 ts->raw_packet_size = TS_PACKET_SIZE;
3082 }
3083 ts->stream = s;
3084 ts->auto_guess = 0;
3085
3086 if (s->iformat == &ff_mpegts_demuxer) {
3087 /* normal demux */
3088
3089 /* first do a scan to get all the services */
3090 seek_back(s, pb, pos);
3091
3092 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
3093 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
3094 mpegts_open_section_filter(ts, EIT_PID, eit_cb, ts, 1);
3095
3096 handle_packets(ts, probesize / ts->raw_packet_size);
3097 /* if could not find service, enable auto_guess */
3098
3099 ts->auto_guess = 1;
3100
3101 av_log(ts->stream, AV_LOG_TRACE, "tuning done\n");
3102
3103 s->ctx_flags |= AVFMTCTX_NOHEADER;
3104 } else {
3105 AVStream *st;
3106 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
3107 int64_t pcrs[2], pcr_h;
3108 uint8_t packet[TS_PACKET_SIZE];
3109 const uint8_t *data;
3110
3111 /* only read packets */
3112
3113 st = avformat_new_stream(s, NULL);
3114 if (!st)
3115 return AVERROR(ENOMEM);
3116 avpriv_set_pts_info(st, 60, 1, 27000000);
3117 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
3118 st->codecpar->codec_id = AV_CODEC_ID_MPEG2TS;
3119
3120 /* we iterate until we find two PCRs to estimate the bitrate */
3121 pcr_pid = -1;
3122 nb_pcrs = 0;
3123 nb_packets = 0;
3124 for (;;) {
3125 ret = read_packet(s, packet, ts->raw_packet_size, &data);
3126 if (ret < 0)
3127 return ret;
3128 pid = AV_RB16(data + 1) & 0x1fff;
3129 if ((pcr_pid == -1 || pcr_pid == pid) &&
3130 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
3131 finished_reading_packet(s, ts->raw_packet_size);
3132 pcr_pid = pid;
3133 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
3134 nb_pcrs++;
3135 if (nb_pcrs >= 2) {
3136 if (pcrs[1] - pcrs[0] > 0) {
3137 /* the difference needs to be positive to make sense for bitrate computation */
3138 break;
3139 } else {
3140 av_log(ts->stream, AV_LOG_WARNING, "invalid pcr pair %"PRId64" >= %"PRId64"\n", pcrs[0], pcrs[1]);
3141 pcrs[0] = pcrs[1];
3142 nb_pcrs--;
3143 }
3144 }
3145 } else {
3146 finished_reading_packet(s, ts->raw_packet_size);
3147 }
3148 nb_packets++;
3149 }
3150
3151 /* NOTE1: the bitrate is computed without the FEC */
3152 /* NOTE2: it is only the bitrate of the start of the stream */
3153 ts->pcr_incr = pcrs[1] - pcrs[0];
3154 ts->cur_pcr = pcrs[0] - ts->pcr_incr * (nb_packets - 1);
3155 s->bit_rate = TS_PACKET_SIZE * 8 * 27000000LL / ts->pcr_incr;
3156 st->codecpar->bit_rate = s->bit_rate;
3157 st->start_time = ts->cur_pcr;
3158 av_log(ts->stream, AV_LOG_TRACE, "start=%0.3f pcr=%0.3f incr=%"PRId64"\n",
3159 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
3160 }
3161
3162 seek_back(s, pb, pos);
3163 return 0;
3164 }
3165
3166 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
3167
mpegts_raw_read_packet(AVFormatContext * s,AVPacket * pkt)3168 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
3169 {
3170 MpegTSContext *ts = s->priv_data;
3171 int ret, i;
3172 int64_t pcr_h, next_pcr_h, pos;
3173 int pcr_l, next_pcr_l;
3174 uint8_t pcr_buf[12];
3175 const uint8_t *data;
3176
3177 if ((ret = av_new_packet(pkt, TS_PACKET_SIZE)) < 0)
3178 return ret;
3179 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
3180 pkt->pos = avio_tell(s->pb);
3181 if (ret < 0) {
3182 return ret;
3183 }
3184 if (data != pkt->data)
3185 memcpy(pkt->data, data, TS_PACKET_SIZE);
3186 finished_reading_packet(s, ts->raw_packet_size);
3187 if (ts->mpeg2ts_compute_pcr) {
3188 /* compute exact PCR for each packet */
3189 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
3190 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
3191 pos = avio_tell(s->pb);
3192 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
3193 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
3194 avio_read(s->pb, pcr_buf, 12);
3195 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
3196 /* XXX: not precise enough */
3197 ts->pcr_incr =
3198 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
3199 (i + 1);
3200 break;
3201 }
3202 }
3203 avio_seek(s->pb, pos, SEEK_SET);
3204 /* no next PCR found: we use previous increment */
3205 ts->cur_pcr = pcr_h * 300 + pcr_l;
3206 }
3207 pkt->pts = ts->cur_pcr;
3208 pkt->duration = ts->pcr_incr;
3209 ts->cur_pcr += ts->pcr_incr;
3210 }
3211 pkt->stream_index = 0;
3212 return 0;
3213 }
3214
mpegts_read_packet(AVFormatContext * s,AVPacket * pkt)3215 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
3216 {
3217 MpegTSContext *ts = s->priv_data;
3218 int ret, i;
3219
3220 pkt->size = -1;
3221 ts->pkt = pkt;
3222 ret = handle_packets(ts, 0);
3223 if (ret < 0) {
3224 av_packet_unref(ts->pkt);
3225 /* flush pes data left */
3226 for (i = 0; i < NB_PID_MAX; i++)
3227 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
3228 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
3229 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
3230 ret = new_pes_packet(pes, pkt);
3231 if (ret < 0)
3232 return ret;
3233 pes->state = MPEGTS_SKIP;
3234 ret = 0;
3235 break;
3236 }
3237 }
3238 }
3239
3240 if (!ret && pkt->size < 0)
3241 ret = AVERROR_INVALIDDATA;
3242 return ret;
3243 }
3244
mpegts_free(MpegTSContext * ts)3245 static void mpegts_free(MpegTSContext *ts)
3246 {
3247 int i;
3248
3249 clear_programs(ts);
3250
3251 for (i = 0; i < FF_ARRAY_ELEMS(ts->pools); i++)
3252 av_buffer_pool_uninit(&ts->pools[i]);
3253
3254 for (i = 0; i < NB_PID_MAX; i++)
3255 if (ts->pids[i])
3256 mpegts_close_filter(ts, ts->pids[i]);
3257 }
3258
mpegts_read_close(AVFormatContext * s)3259 static int mpegts_read_close(AVFormatContext *s)
3260 {
3261 MpegTSContext *ts = s->priv_data;
3262 mpegts_free(ts);
3263 return 0;
3264 }
3265
mpegts_get_pcr(AVFormatContext * s,int stream_index,int64_t * ppos,int64_t pos_limit)3266 static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
3267 int64_t *ppos, int64_t pos_limit)
3268 {
3269 MpegTSContext *ts = s->priv_data;
3270 int64_t pos, timestamp;
3271 uint8_t buf[TS_PACKET_SIZE];
3272 int pcr_l, pcr_pid =
3273 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
3274 int pos47 = ts->pos47_full % ts->raw_packet_size;
3275 pos =
3276 ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
3277 ts->raw_packet_size + pos47;
3278 while(pos < pos_limit) {
3279 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
3280 return AV_NOPTS_VALUE;
3281 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
3282 return AV_NOPTS_VALUE;
3283 if (buf[0] != 0x47) {
3284 if (mpegts_resync(s, TS_PACKET_SIZE, buf) < 0)
3285 return AV_NOPTS_VALUE;
3286 pos = avio_tell(s->pb);
3287 continue;
3288 }
3289 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
3290 parse_pcr(×tamp, &pcr_l, buf) == 0) {
3291 *ppos = pos;
3292 return timestamp;
3293 }
3294 pos += ts->raw_packet_size;
3295 }
3296
3297 return AV_NOPTS_VALUE;
3298 }
3299
mpegts_get_dts(AVFormatContext * s,int stream_index,int64_t * ppos,int64_t pos_limit)3300 static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
3301 int64_t *ppos, int64_t pos_limit)
3302 {
3303 MpegTSContext *ts = s->priv_data;
3304 AVPacket *pkt;
3305 int64_t pos;
3306 int pos47 = ts->pos47_full % ts->raw_packet_size;
3307 pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
3308 ff_read_frame_flush(s);
3309 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
3310 return AV_NOPTS_VALUE;
3311 pkt = av_packet_alloc();
3312 if (!pkt)
3313 return AV_NOPTS_VALUE;
3314 while(pos < pos_limit) {
3315 int ret = av_read_frame(s, pkt);
3316 if (ret < 0) {
3317 av_packet_free(&pkt);
3318 return AV_NOPTS_VALUE;
3319 }
3320 if (pkt->dts != AV_NOPTS_VALUE && pkt->pos >= 0) {
3321 ff_reduce_index(s, pkt->stream_index);
3322 av_add_index_entry(s->streams[pkt->stream_index], pkt->pos, pkt->dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
3323 if (pkt->stream_index == stream_index && pkt->pos >= *ppos) {
3324 int64_t dts = pkt->dts;
3325 *ppos = pkt->pos;
3326 av_packet_free(&pkt);
3327 return dts;
3328 }
3329 }
3330 pos = pkt->pos;
3331 av_packet_unref(pkt);
3332 }
3333
3334 av_packet_free(&pkt);
3335 return AV_NOPTS_VALUE;
3336 }
3337
3338 /**************************************************************/
3339 /* parsing functions - called from other demuxers such as RTP */
3340
avpriv_mpegts_parse_open(AVFormatContext * s)3341 MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
3342 {
3343 MpegTSContext *ts;
3344
3345 ts = av_mallocz(sizeof(MpegTSContext));
3346 if (!ts)
3347 return NULL;
3348 /* no stream case, currently used by RTP */
3349 ts->raw_packet_size = TS_PACKET_SIZE;
3350 ts->stream = s;
3351 ts->auto_guess = 1;
3352
3353 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
3354 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
3355 mpegts_open_section_filter(ts, EIT_PID, eit_cb, ts, 1);
3356
3357 return ts;
3358 }
3359
3360 /* return the consumed length if a packet was output, or -1 if no
3361 * packet is output */
avpriv_mpegts_parse_packet(MpegTSContext * ts,AVPacket * pkt,const uint8_t * buf,int len)3362 int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
3363 const uint8_t *buf, int len)
3364 {
3365 int len1;
3366
3367 len1 = len;
3368 ts->pkt = pkt;
3369 for (;;) {
3370 ts->stop_parse = 0;
3371 if (len < TS_PACKET_SIZE)
3372 return AVERROR_INVALIDDATA;
3373 if (buf[0] != 0x47) {
3374 buf++;
3375 len--;
3376 } else {
3377 handle_packet(ts, buf, len1 - len + TS_PACKET_SIZE);
3378 buf += TS_PACKET_SIZE;
3379 len -= TS_PACKET_SIZE;
3380 if (ts->stop_parse == 1)
3381 break;
3382 }
3383 }
3384 return len1 - len;
3385 }
3386
avpriv_mpegts_parse_close(MpegTSContext * ts)3387 void avpriv_mpegts_parse_close(MpegTSContext *ts)
3388 {
3389 mpegts_free(ts);
3390 av_free(ts);
3391 }
3392
3393 AVInputFormat ff_mpegts_demuxer = {
3394 .name = "mpegts",
3395 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
3396 .priv_data_size = sizeof(MpegTSContext),
3397 .read_probe = mpegts_probe,
3398 .read_header = mpegts_read_header,
3399 .read_packet = mpegts_read_packet,
3400 .read_close = mpegts_read_close,
3401 .read_timestamp = mpegts_get_dts,
3402 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
3403 .priv_class = &mpegts_class,
3404 };
3405
3406 AVInputFormat ff_mpegtsraw_demuxer = {
3407 .name = "mpegtsraw",
3408 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
3409 .priv_data_size = sizeof(MpegTSContext),
3410 .read_header = mpegts_read_header,
3411 .read_packet = mpegts_raw_read_packet,
3412 .read_close = mpegts_read_close,
3413 .read_timestamp = mpegts_get_dts,
3414 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
3415 .priv_class = &mpegtsraw_class,
3416 };
3417