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mpegts: Add jpeg2000 stream type
[libav.git] / libavformat / mpegts.c
1 /*
2 * MPEG2 transport stream (aka DVB) demuxer
3 * Copyright (c) 2002-2003 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/buffer.h"
23 #include "libavutil/crc.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/log.h"
26 #include "libavutil/dict.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 #include "libavcodec/bytestream.h"
30 #include "libavcodec/get_bits.h"
31 #include "libavcodec/opus.h"
32 #include "avformat.h"
33 #include "mpegts.h"
34 #include "internal.h"
35 #include "avio_internal.h"
36 #include "mpeg.h"
37 #include "isom.h"
38
39 /* maximum size in which we look for synchronisation if
40 * synchronisation is lost */
41 #define MAX_RESYNC_SIZE 65536
42
43 #define MAX_PES_PAYLOAD 200 * 1024
44
45 #define MAX_MP4_DESCR_COUNT 16
46
47 #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \
48 do { \
49 if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
50 (modulus) = (dividend) % (divisor); \
51 (prev_dividend) = (dividend); \
52 } while (0)
53
54 enum MpegTSFilterType {
55 MPEGTS_PES,
56 MPEGTS_SECTION,
57 };
58
59 typedef struct MpegTSFilter MpegTSFilter;
60
61 typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
62 int is_start, int64_t pos);
63
64 typedef struct MpegTSPESFilter {
65 PESCallback *pes_cb;
66 void *opaque;
67 } MpegTSPESFilter;
68
69 typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
70
71 typedef void SetServiceCallback (void *opaque, int ret);
72
73 typedef struct MpegTSSectionFilter {
74 int section_index;
75 int section_h_size;
76 int last_ver;
77 uint8_t *section_buf;
78 unsigned int check_crc : 1;
79 unsigned int end_of_section_reached : 1;
80 SectionCallback *section_cb;
81 void *opaque;
82 } MpegTSSectionFilter;
83
84 struct MpegTSFilter {
85 int pid;
86 int es_id;
87 int last_cc; /* last cc code (-1 if first packet) */
88 enum MpegTSFilterType type;
89 union {
90 MpegTSPESFilter pes_filter;
91 MpegTSSectionFilter section_filter;
92 } u;
93 };
94
95 #define MAX_PIDS_PER_PROGRAM 64
96 struct Program {
97 unsigned int id; // program id/service id
98 unsigned int nb_pids;
99 unsigned int pids[MAX_PIDS_PER_PROGRAM];
100 };
101
102 struct MpegTSContext {
103 const AVClass *class;
104 /* user data */
105 AVFormatContext *stream;
106 /** raw packet size, including FEC if present */
107 int raw_packet_size;
108
109 int pos47;
110 /** position corresponding to pos47, or 0 if pos47 invalid */
111 int64_t pos;
112
113 /** if true, all pids are analyzed to find streams */
114 int auto_guess;
115
116 /** compute exact PCR for each transport stream packet */
117 int mpeg2ts_compute_pcr;
118
119 int64_t cur_pcr; /**< used to estimate the exact PCR */
120 int pcr_incr; /**< used to estimate the exact PCR */
121
122 /* data needed to handle file based ts */
123 /** stop parsing loop */
124 int stop_parse;
125 /** packet containing Audio/Video data */
126 AVPacket *pkt;
127 /** to detect seek */
128 int64_t last_pos;
129
130 int resync_size;
131
132 /******************************************/
133 /* private mpegts data */
134 /* scan context */
135 /** structure to keep track of Program->pids mapping */
136 unsigned int nb_prg;
137 struct Program *prg;
138
139 /** filters for various streams specified by PMT + for the PAT and PMT */
140 MpegTSFilter *pids[NB_PID_MAX];
141 };
142
143 #define MPEGTS_OPTIONS \
144 { "resync_size", "Size limit for looking up a new syncronization.", offsetof(MpegTSContext, resync_size), AV_OPT_TYPE_INT, { .i64 = MAX_RESYNC_SIZE}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }
145
146 static const AVOption options[] = {
147 MPEGTS_OPTIONS,
148 { NULL },
149 };
150
151 static const AVClass mpegts_class = {
152 .class_name = "mpegts demuxer",
153 .item_name = av_default_item_name,
154 .option = options,
155 .version = LIBAVUTIL_VERSION_INT,
156 };
157
158 static const AVOption raw_options[] = {
159 MPEGTS_OPTIONS,
160 { "compute_pcr", "Compute exact PCR for each transport stream packet.",
161 offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT,
162 { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
163 { "ts_packetsize", "Output option carrying the raw packet size.",
164 offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
165 { .i64 = 0 }, 0, 0,
166 AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
167 { NULL },
168 };
169
170 static const AVClass mpegtsraw_class = {
171 .class_name = "mpegtsraw demuxer",
172 .item_name = av_default_item_name,
173 .option = raw_options,
174 .version = LIBAVUTIL_VERSION_INT,
175 };
176
177 /* TS stream handling */
178
179 enum MpegTSState {
180 MPEGTS_HEADER = 0,
181 MPEGTS_PESHEADER,
182 MPEGTS_PESHEADER_FILL,
183 MPEGTS_PAYLOAD,
184 MPEGTS_SKIP,
185 };
186
187 /* enough for PES header + length */
188 #define PES_START_SIZE 6
189 #define PES_HEADER_SIZE 9
190 #define MAX_PES_HEADER_SIZE (9 + 255)
191
192 typedef struct PESContext {
193 int pid;
194 int pcr_pid; /**< if -1 then all packets containing PCR are considered */
195 int stream_type;
196 MpegTSContext *ts;
197 AVFormatContext *stream;
198 AVStream *st;
199 AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
200 enum MpegTSState state;
201 /* used to get the format */
202 int data_index;
203 int flags; /**< copied to the AVPacket flags */
204 int total_size;
205 int pes_header_size;
206 int extended_stream_id;
207 int64_t pts, dts;
208 int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
209 uint8_t header[MAX_PES_HEADER_SIZE];
210 AVBufferRef *buffer;
211 SLConfigDescr sl;
212 } PESContext;
213
214 extern AVInputFormat ff_mpegts_demuxer;
215
216 static void clear_program(MpegTSContext *ts, unsigned int programid)
217 {
218 int i;
219
220 for (i = 0; i < ts->nb_prg; i++)
221 if (ts->prg[i].id == programid)
222 ts->prg[i].nb_pids = 0;
223 }
224
225 static void clear_programs(MpegTSContext *ts)
226 {
227 av_freep(&ts->prg);
228 ts->nb_prg = 0;
229 }
230
231 static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
232 {
233 struct Program *p;
234 if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
235 ts->nb_prg = 0;
236 return;
237 }
238 p = &ts->prg[ts->nb_prg];
239 p->id = programid;
240 p->nb_pids = 0;
241 ts->nb_prg++;
242 }
243
244 static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
245 unsigned int pid)
246 {
247 int i;
248 struct Program *p = NULL;
249 for (i = 0; i < ts->nb_prg; i++) {
250 if (ts->prg[i].id == programid) {
251 p = &ts->prg[i];
252 break;
253 }
254 }
255 if (!p)
256 return;
257
258 if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
259 return;
260 p->pids[p->nb_pids++] = pid;
261 }
262
263 /**
264 * @brief discard_pid() decides if the pid is to be discarded according
265 * to caller's programs selection
266 * @param ts : - TS context
267 * @param pid : - pid
268 * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
269 * 0 otherwise
270 */
271 static int discard_pid(MpegTSContext *ts, unsigned int pid)
272 {
273 int i, j, k;
274 int used = 0, discarded = 0;
275 struct Program *p;
276
277 /* If none of the programs have .discard=AVDISCARD_ALL then there's
278 * no way we have to discard this packet */
279 for (k = 0; k < ts->stream->nb_programs; k++)
280 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
281 break;
282 if (k == ts->stream->nb_programs)
283 return 0;
284
285 for (i = 0; i < ts->nb_prg; i++) {
286 p = &ts->prg[i];
287 for (j = 0; j < p->nb_pids; j++) {
288 if (p->pids[j] != pid)
289 continue;
290 // is program with id p->id set to be discarded?
291 for (k = 0; k < ts->stream->nb_programs; k++) {
292 if (ts->stream->programs[k]->id == p->id) {
293 if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
294 discarded++;
295 else
296 used++;
297 }
298 }
299 }
300 }
301
302 return !used && discarded;
303 }
304
305 /**
306 * Assemble PES packets out of TS packets, and then call the "section_cb"
307 * function when they are complete.
308 */
309 static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
310 const uint8_t *buf, int buf_size, int is_start)
311 {
312 MpegTSSectionFilter *tss = &tss1->u.section_filter;
313 int len;
314
315 if (is_start) {
316 memcpy(tss->section_buf, buf, buf_size);
317 tss->section_index = buf_size;
318 tss->section_h_size = -1;
319 tss->end_of_section_reached = 0;
320 } else {
321 if (tss->end_of_section_reached)
322 return;
323 len = 4096 - tss->section_index;
324 if (buf_size < len)
325 len = buf_size;
326 memcpy(tss->section_buf + tss->section_index, buf, len);
327 tss->section_index += len;
328 }
329
330 /* compute section length if possible */
331 if (tss->section_h_size == -1 && tss->section_index >= 3) {
332 len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3;
333 if (len > 4096)
334 return;
335 tss->section_h_size = len;
336 }
337
338 if (tss->section_h_size != -1 &&
339 tss->section_index >= tss->section_h_size) {
340 tss->end_of_section_reached = 1;
341 if (!tss->check_crc ||
342 av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1,
343 tss->section_buf, tss->section_h_size) == 0)
344 tss->section_cb(tss1, tss->section_buf, tss->section_h_size);
345 }
346 }
347
348 static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
349 unsigned int pid,
350 SectionCallback *section_cb,
351 void *opaque,
352 int check_crc)
353 {
354 MpegTSFilter *filter;
355 MpegTSSectionFilter *sec;
356
357 av_log(ts->stream, AV_LOG_TRACE, "Filter: pid=0x%x\n", pid);
358
359 if (pid >= NB_PID_MAX || ts->pids[pid])
360 return NULL;
361 filter = av_mallocz(sizeof(MpegTSFilter));
362 if (!filter)
363 return NULL;
364 ts->pids[pid] = filter;
365
366 filter->type = MPEGTS_SECTION;
367 filter->pid = pid;
368 filter->es_id = -1;
369 filter->last_cc = -1;
370
371 sec = &filter->u.section_filter;
372 sec->section_cb = section_cb;
373 sec->opaque = opaque;
374 sec->section_buf = av_malloc(MAX_SECTION_SIZE);
375 sec->check_crc = check_crc;
376 sec->last_ver = -1;
377
378 if (!sec->section_buf) {
379 av_free(filter);
380 return NULL;
381 }
382 return filter;
383 }
384
385 static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
386 PESCallback *pes_cb,
387 void *opaque)
388 {
389 MpegTSFilter *filter;
390 MpegTSPESFilter *pes;
391
392 if (pid >= NB_PID_MAX || ts->pids[pid])
393 return NULL;
394 filter = av_mallocz(sizeof(MpegTSFilter));
395 if (!filter)
396 return NULL;
397
398 ts->pids[pid] = filter;
399 filter->type = MPEGTS_PES;
400 filter->pid = pid;
401 filter->es_id = -1;
402 filter->last_cc = -1;
403
404 pes = &filter->u.pes_filter;
405 pes->pes_cb = pes_cb;
406 pes->opaque = opaque;
407 return filter;
408 }
409
410 static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
411 {
412 int pid;
413
414 pid = filter->pid;
415 if (filter->type == MPEGTS_SECTION)
416 av_freep(&filter->u.section_filter.section_buf);
417 else if (filter->type == MPEGTS_PES) {
418 PESContext *pes = filter->u.pes_filter.opaque;
419 av_buffer_unref(&pes->buffer);
420 /* referenced private data will be freed later in
421 * avformat_close_input */
422 if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
423 av_freep(&filter->u.pes_filter.opaque);
424 }
425 }
426
427 av_free(filter);
428 ts->pids[pid] = NULL;
429 }
430
431 static int analyze(const uint8_t *buf, int size, int packet_size, int *index,
432 int probe)
433 {
434 int stat[TS_MAX_PACKET_SIZE];
435 int i;
436 int x = 0;
437 int best_score = 0;
438
439 memset(stat, 0, packet_size * sizeof(int));
440
441 for (x = i = 0; i < size - 3; i++) {
442 if (buf[i] == 0x47 &&
443 (!probe || (!(buf[i + 1] & 0x80) && (buf[i + 3] & 0x30)))) {
444 stat[x]++;
445 if (stat[x] > best_score) {
446 best_score = stat[x];
447 if (index)
448 *index = x;
449 }
450 }
451
452 x++;
453 if (x == packet_size)
454 x = 0;
455 }
456
457 return best_score;
458 }
459
460 /* autodetect fec presence. Must have at least 1024 bytes */
461 static int get_packet_size(const uint8_t *buf, int size)
462 {
463 int score, fec_score, dvhs_score;
464
465 if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
466 return AVERROR_INVALIDDATA;
467
468 score = analyze(buf, size, TS_PACKET_SIZE, NULL, 0);
469 dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL, 0);
470 fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL, 0);
471 av_log(NULL, AV_LOG_TRACE, "score: %d, dvhs_score: %d, fec_score: %d \n",
472 score, dvhs_score, fec_score);
473
474 if (score > fec_score && score > dvhs_score)
475 return TS_PACKET_SIZE;
476 else if (dvhs_score > score && dvhs_score > fec_score)
477 return TS_DVHS_PACKET_SIZE;
478 else if (score < fec_score && dvhs_score < fec_score)
479 return TS_FEC_PACKET_SIZE;
480 else
481 return AVERROR_INVALIDDATA;
482 }
483
484 typedef struct SectionHeader {
485 uint8_t tid;
486 uint16_t id;
487 uint8_t version;
488 uint8_t sec_num;
489 uint8_t last_sec_num;
490 } SectionHeader;
491
492 static inline int get8(const uint8_t **pp, const uint8_t *p_end)
493 {
494 const uint8_t *p;
495 int c;
496
497 p = *pp;
498 if (p >= p_end)
499 return AVERROR_INVALIDDATA;
500 c = *p++;
501 *pp = p;
502 return c;
503 }
504
505 static inline int get16(const uint8_t **pp, const uint8_t *p_end)
506 {
507 const uint8_t *p;
508 int c;
509
510 p = *pp;
511 if ((p + 1) >= p_end)
512 return AVERROR_INVALIDDATA;
513 c = AV_RB16(p);
514 p += 2;
515 *pp = p;
516 return c;
517 }
518
519 /* read and allocate a DVB string preceded by its length */
520 static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
521 {
522 int len;
523 const uint8_t *p;
524 char *str;
525
526 p = *pp;
527 len = get8(&p, p_end);
528 if (len < 0)
529 return NULL;
530 if ((p + len) > p_end)
531 return NULL;
532 str = av_malloc(len + 1);
533 if (!str)
534 return NULL;
535 memcpy(str, p, len);
536 str[len] = '\0';
537 p += len;
538 *pp = p;
539 return str;
540 }
541
542 static int parse_section_header(SectionHeader *h,
543 const uint8_t **pp, const uint8_t *p_end)
544 {
545 int val;
546
547 val = get8(pp, p_end);
548 if (val < 0)
549 return val;
550 h->tid = val;
551 *pp += 2;
552 val = get16(pp, p_end);
553 if (val < 0)
554 return val;
555 h->id = val;
556 val = get8(pp, p_end);
557 if (val < 0)
558 return val;
559 h->version = (val >> 1) & 0x1f;
560 val = get8(pp, p_end);
561 if (val < 0)
562 return val;
563 h->sec_num = val;
564 val = get8(pp, p_end);
565 if (val < 0)
566 return val;
567 h->last_sec_num = val;
568 return 0;
569 }
570
571 typedef struct StreamType {
572 uint32_t stream_type;
573 enum AVMediaType codec_type;
574 enum AVCodecID codec_id;
575 } StreamType;
576
577 static const StreamType ISO_types[] = {
578 { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
579 { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
580 { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
581 { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 },
582 { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC },
583 { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 },
584 { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */
585 { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 },
586 { 0x21, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_JPEG2000 },
587 { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
588 { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS },
589 { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
590 { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
591 { 0 },
592 };
593
594 static const StreamType HDMV_types[] = {
595 { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY },
596 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
597 { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
598 { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD },
599 { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 },
600 { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */
601 { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/
602 { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
603 { 0 },
604 };
605
606 /* ATSC ? */
607 static const StreamType MISC_types[] = {
608 { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
609 { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
610 { 0 },
611 };
612
613 static const StreamType REGD_types[] = {
614 { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
615 { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
616 { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
617 { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
618 { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
619 { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
620 { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC },
621 { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 },
622 { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS },
623 { 0 },
624 };
625
626 /* descriptor present */
627 static const StreamType DESC_types[] = {
628 { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */
629 { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */
630 { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
631 { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
632 { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
633 { 0 },
634 };
635
636 static void mpegts_find_stream_type(AVStream *st,
637 uint32_t stream_type,
638 const StreamType *types)
639 {
640 for (; types->stream_type; types++)
641 if (stream_type == types->stream_type) {
642 st->codec->codec_type = types->codec_type;
643 st->codec->codec_id = types->codec_id;
644 return;
645 }
646 }
647
648 static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
649 uint32_t stream_type, uint32_t prog_reg_desc)
650 {
651 avpriv_set_pts_info(st, 33, 1, 90000);
652 st->priv_data = pes;
653 st->codec->codec_type = AVMEDIA_TYPE_DATA;
654 st->codec->codec_id = AV_CODEC_ID_NONE;
655 st->need_parsing = AVSTREAM_PARSE_FULL;
656 pes->st = st;
657 pes->stream_type = stream_type;
658
659 av_log(pes->stream, AV_LOG_DEBUG,
660 "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
661 st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
662
663 st->codec->codec_tag = pes->stream_type;
664
665 mpegts_find_stream_type(st, pes->stream_type, ISO_types);
666 if (prog_reg_desc == AV_RL32("HDMV") &&
667 st->codec->codec_id == AV_CODEC_ID_NONE) {
668 mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
669 if (pes->stream_type == 0x83) {
670 // HDMV TrueHD streams also contain an AC3 coded version of the
671 // audio track - add a second stream for this
672 AVStream *sub_st;
673 // priv_data cannot be shared between streams
674 PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
675 if (!sub_pes)
676 return AVERROR(ENOMEM);
677 memcpy(sub_pes, pes, sizeof(*sub_pes));
678
679 sub_st = avformat_new_stream(pes->stream, NULL);
680 if (!sub_st) {
681 av_free(sub_pes);
682 return AVERROR(ENOMEM);
683 }
684
685 sub_st->id = pes->pid;
686 avpriv_set_pts_info(sub_st, 33, 1, 90000);
687 sub_st->priv_data = sub_pes;
688 sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
689 sub_st->codec->codec_id = AV_CODEC_ID_AC3;
690 sub_st->need_parsing = AVSTREAM_PARSE_FULL;
691 sub_pes->sub_st = pes->sub_st = sub_st;
692 }
693 }
694 if (st->codec->codec_id == AV_CODEC_ID_NONE)
695 mpegts_find_stream_type(st, pes->stream_type, MISC_types);
696
697 return 0;
698 }
699
700 static void new_pes_packet(PESContext *pes, AVPacket *pkt)
701 {
702 av_init_packet(pkt);
703
704 pkt->buf = pes->buffer;
705 pkt->data = pes->buffer->data;
706 pkt->size = pes->data_index;
707
708 if (pes->total_size != MAX_PES_PAYLOAD &&
709 pes->pes_header_size + pes->data_index != pes->total_size +
710 PES_START_SIZE) {
711 av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
712 pes->flags |= AV_PKT_FLAG_CORRUPT;
713 }
714 memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
715
716 // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
717 if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
718 pkt->stream_index = pes->sub_st->index;
719 else
720 pkt->stream_index = pes->st->index;
721 pkt->pts = pes->pts;
722 pkt->dts = pes->dts;
723 /* store position of first TS packet of this PES packet */
724 pkt->pos = pes->ts_packet_pos;
725 pkt->flags = pes->flags;
726
727 /* reset pts values */
728 pes->pts = AV_NOPTS_VALUE;
729 pes->dts = AV_NOPTS_VALUE;
730 pes->buffer = NULL;
731 pes->data_index = 0;
732 pes->flags = 0;
733 }
734
735 static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
736 const uint8_t *buf, int buf_size)
737 {
738 GetBitContext gb;
739 int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
740 int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
741 int dts_flag = -1, cts_flag = -1;
742 int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
743 init_get_bits(&gb, buf, buf_size * 8);
744
745 if (sl->use_au_start)
746 au_start_flag = get_bits1(&gb);
747 if (sl->use_au_end)
748 au_end_flag = get_bits1(&gb);
749 if (!sl->use_au_start && !sl->use_au_end)
750 au_start_flag = au_end_flag = 1;
751 if (sl->ocr_len > 0)
752 ocr_flag = get_bits1(&gb);
753 if (sl->use_idle)
754 idle_flag = get_bits1(&gb);
755 if (sl->use_padding)
756 padding_flag = get_bits1(&gb);
757 if (padding_flag)
758 padding_bits = get_bits(&gb, 3);
759
760 if (!idle_flag && (!padding_flag || padding_bits != 0)) {
761 if (sl->packet_seq_num_len)
762 skip_bits_long(&gb, sl->packet_seq_num_len);
763 if (sl->degr_prior_len)
764 if (get_bits1(&gb))
765 skip_bits(&gb, sl->degr_prior_len);
766 if (ocr_flag)
767 skip_bits_long(&gb, sl->ocr_len);
768 if (au_start_flag) {
769 if (sl->use_rand_acc_pt)
770 get_bits1(&gb);
771 if (sl->au_seq_num_len > 0)
772 skip_bits_long(&gb, sl->au_seq_num_len);
773 if (sl->use_timestamps) {
774 dts_flag = get_bits1(&gb);
775 cts_flag = get_bits1(&gb);
776 }
777 }
778 if (sl->inst_bitrate_len)
779 inst_bitrate_flag = get_bits1(&gb);
780 if (dts_flag == 1)
781 dts = get_bits64(&gb, sl->timestamp_len);
782 if (cts_flag == 1)
783 cts = get_bits64(&gb, sl->timestamp_len);
784 if (sl->au_len > 0)
785 skip_bits_long(&gb, sl->au_len);
786 if (inst_bitrate_flag)
787 skip_bits_long(&gb, sl->inst_bitrate_len);
788 }
789
790 if (dts != AV_NOPTS_VALUE)
791 pes->dts = dts;
792 if (cts != AV_NOPTS_VALUE)
793 pes->pts = cts;
794
795 if (sl->timestamp_len && sl->timestamp_res)
796 avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
797
798 return (get_bits_count(&gb) + 7) >> 3;
799 }
800
801 /* return non zero if a packet could be constructed */
802 static int mpegts_push_data(MpegTSFilter *filter,
803 const uint8_t *buf, int buf_size, int is_start,
804 int64_t pos)
805 {
806 PESContext *pes = filter->u.pes_filter.opaque;
807 MpegTSContext *ts = pes->ts;
808 const uint8_t *p;
809 int len, code;
810
811 if (!ts->pkt)
812 return 0;
813
814 if (is_start) {
815 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
816 new_pes_packet(pes, ts->pkt);
817 ts->stop_parse = 1;
818 }
819 pes->state = MPEGTS_HEADER;
820 pes->data_index = 0;
821 pes->ts_packet_pos = pos;
822 }
823 p = buf;
824 while (buf_size > 0) {
825 switch (pes->state) {
826 case MPEGTS_HEADER:
827 len = PES_START_SIZE - pes->data_index;
828 if (len > buf_size)
829 len = buf_size;
830 memcpy(pes->header + pes->data_index, p, len);
831 pes->data_index += len;
832 p += len;
833 buf_size -= len;
834 if (pes->data_index == PES_START_SIZE) {
835 /* we got all the PES or section header. We can now
836 * decide */
837 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
838 pes->header[2] == 0x01) {
839 /* it must be an mpeg2 PES stream */
840 code = pes->header[3] | 0x100;
841 av_log(pes->stream, AV_LOG_TRACE, "pid=%x pes_code=%#x\n", pes->pid,
842 code);
843
844 if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
845 (!pes->sub_st ||
846 pes->sub_st->discard == AVDISCARD_ALL)) ||
847 code == 0x1be) /* padding_stream */
848 goto skip;
849
850 /* stream not present in PMT */
851 if (!pes->st) {
852 pes->st = avformat_new_stream(ts->stream, NULL);
853 if (!pes->st)
854 return AVERROR(ENOMEM);
855 pes->st->id = pes->pid;
856 mpegts_set_stream_info(pes->st, pes, 0, 0);
857 }
858
859 pes->total_size = AV_RB16(pes->header + 4);
860 /* NOTE: a zero total size means the PES size is
861 * unbounded */
862 if (!pes->total_size)
863 pes->total_size = MAX_PES_PAYLOAD;
864
865 /* allocate pes buffer */
866 pes->buffer = av_buffer_alloc(pes->total_size +
867 FF_INPUT_BUFFER_PADDING_SIZE);
868 if (!pes->buffer)
869 return AVERROR(ENOMEM);
870
871 if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
872 code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
873 code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
874 code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */
875 pes->state = MPEGTS_PESHEADER;
876 if (pes->st->codec->codec_id == AV_CODEC_ID_NONE) {
877 av_log(pes->stream, AV_LOG_TRACE,
878 "pid=%x stream_type=%x probing\n",
879 pes->pid,
880 pes->stream_type);
881 pes->st->codec->codec_id = AV_CODEC_ID_PROBE;
882 }
883 } else {
884 pes->state = MPEGTS_PAYLOAD;
885 pes->data_index = 0;
886 }
887 } else {
888 /* otherwise, it should be a table */
889 /* skip packet */
890 skip:
891 pes->state = MPEGTS_SKIP;
892 continue;
893 }
894 }
895 break;
896 /**********************************************/
897 /* PES packing parsing */
898 case MPEGTS_PESHEADER:
899 len = PES_HEADER_SIZE - pes->data_index;
900 if (len < 0)
901 return AVERROR_INVALIDDATA;
902 if (len > buf_size)
903 len = buf_size;
904 memcpy(pes->header + pes->data_index, p, len);
905 pes->data_index += len;
906 p += len;
907 buf_size -= len;
908 if (pes->data_index == PES_HEADER_SIZE) {
909 pes->pes_header_size = pes->header[8] + 9;
910 pes->state = MPEGTS_PESHEADER_FILL;
911 }
912 break;
913 case MPEGTS_PESHEADER_FILL:
914 len = pes->pes_header_size - pes->data_index;
915 if (len < 0)
916 return AVERROR_INVALIDDATA;
917 if (len > buf_size)
918 len = buf_size;
919 memcpy(pes->header + pes->data_index, p, len);
920 pes->data_index += len;
921 p += len;
922 buf_size -= len;
923 if (pes->data_index == pes->pes_header_size) {
924 const uint8_t *r;
925 unsigned int flags, pes_ext, skip;
926
927 flags = pes->header[7];
928 r = pes->header + 9;
929 pes->pts = AV_NOPTS_VALUE;
930 pes->dts = AV_NOPTS_VALUE;
931 if ((flags & 0xc0) == 0x80) {
932 pes->dts = pes->pts = ff_parse_pes_pts(r);
933 r += 5;
934 } else if ((flags & 0xc0) == 0xc0) {
935 pes->pts = ff_parse_pes_pts(r);
936 r += 5;
937 pes->dts = ff_parse_pes_pts(r);
938 r += 5;
939 }
940 pes->extended_stream_id = -1;
941 if (flags & 0x01) { /* PES extension */
942 pes_ext = *r++;
943 /* Skip PES private data, program packet sequence counter and P-STD buffer */
944 skip = (pes_ext >> 4) & 0xb;
945 skip += skip & 0x9;
946 r += skip;
947 if ((pes_ext & 0x41) == 0x01 &&
948 (r + 2) <= (pes->header + pes->pes_header_size)) {
949 /* PES extension 2 */
950 if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
951 pes->extended_stream_id = r[1];
952 }
953 }
954
955 /* we got the full header. We parse it and get the payload */
956 pes->state = MPEGTS_PAYLOAD;
957 pes->data_index = 0;
958 if (pes->stream_type == 0x12 && buf_size > 0) {
959 int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
960 buf_size);
961 pes->pes_header_size += sl_header_bytes;
962 p += sl_header_bytes;
963 buf_size -= sl_header_bytes;
964 }
965 }
966 break;
967 case MPEGTS_PAYLOAD:
968 if (buf_size > 0 && pes->buffer) {
969 if (pes->data_index > 0 &&
970 pes->data_index + buf_size > pes->total_size) {
971 new_pes_packet(pes, ts->pkt);
972 pes->total_size = MAX_PES_PAYLOAD;
973 pes->buffer = av_buffer_alloc(pes->total_size +
974 FF_INPUT_BUFFER_PADDING_SIZE);
975 if (!pes->buffer)
976 return AVERROR(ENOMEM);
977 ts->stop_parse = 1;
978 } else if (pes->data_index == 0 &&
979 buf_size > pes->total_size) {
980 // pes packet size is < ts size packet and pes data is padded with 0xff
981 // not sure if this is legal in ts but see issue #2392
982 buf_size = pes->total_size;
983 }
984 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
985 pes->data_index += buf_size;
986 }
987 buf_size = 0;
988 /* emit complete packets with known packet size
989 * decreases demuxer delay for infrequent packets like subtitles from
990 * a couple of seconds to milliseconds for properly muxed files.
991 * total_size is the number of bytes following pes_packet_length
992 * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
993 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
994 pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
995 ts->stop_parse = 1;
996 new_pes_packet(pes, ts->pkt);
997 }
998 break;
999 case MPEGTS_SKIP:
1000 buf_size = 0;
1001 break;
1002 }
1003 }
1004
1005 return 0;
1006 }
1007
1008 static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
1009 {
1010 MpegTSFilter *tss;
1011 PESContext *pes;
1012
1013 /* if no pid found, then add a pid context */
1014 pes = av_mallocz(sizeof(PESContext));
1015 if (!pes)
1016 return 0;
1017 pes->ts = ts;
1018 pes->stream = ts->stream;
1019 pes->pid = pid;
1020 pes->pcr_pid = pcr_pid;
1021 pes->state = MPEGTS_SKIP;
1022 pes->pts = AV_NOPTS_VALUE;
1023 pes->dts = AV_NOPTS_VALUE;
1024 tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
1025 if (!tss) {
1026 av_free(pes);
1027 return 0;
1028 }
1029 return pes;
1030 }
1031
1032 #define MAX_LEVEL 4
1033 typedef struct MP4DescrParseContext {
1034 AVFormatContext *s;
1035 AVIOContext pb;
1036 Mp4Descr *descr;
1037 Mp4Descr *active_descr;
1038 int descr_count;
1039 int max_descr_count;
1040 int level;
1041 } MP4DescrParseContext;
1042
1043 static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
1044 const uint8_t *buf, unsigned size,
1045 Mp4Descr *descr, int max_descr_count)
1046 {
1047 int ret;
1048 if (size > (1 << 30))
1049 return AVERROR_INVALIDDATA;
1050
1051 if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
1052 NULL, NULL, NULL, NULL)) < 0)
1053 return ret;
1054
1055 d->s = s;
1056 d->level = 0;
1057 d->descr_count = 0;
1058 d->descr = descr;
1059 d->active_descr = NULL;
1060 d->max_descr_count = max_descr_count;
1061
1062 return 0;
1063 }
1064
1065 static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
1066 {
1067 int64_t new_off = avio_tell(pb);
1068 (*len) -= new_off - *off;
1069 *off = new_off;
1070 }
1071
1072 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1073 int target_tag);
1074
1075 static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
1076 {
1077 while (len > 0) {
1078 int ret = parse_mp4_descr(d, off, len, 0);
1079 if (ret < 0)
1080 return ret;
1081 update_offsets(&d->pb, &off, &len);
1082 }
1083 return 0;
1084 }
1085
1086 static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1087 {
1088 avio_rb16(&d->pb); // ID
1089 avio_r8(&d->pb);
1090 avio_r8(&d->pb);
1091 avio_r8(&d->pb);
1092 avio_r8(&d->pb);
1093 avio_r8(&d->pb);
1094 update_offsets(&d->pb, &off, &len);
1095 return parse_mp4_descr_arr(d, off, len);
1096 }
1097
1098 static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
1099 {
1100 int id_flags;
1101 if (len < 2)
1102 return 0;
1103 id_flags = avio_rb16(&d->pb);
1104 if (!(id_flags & 0x0020)) { // URL_Flag
1105 update_offsets(&d->pb, &off, &len);
1106 return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
1107 } else {
1108 return 0;
1109 }
1110 }
1111
1112 static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1113 {
1114 int es_id = 0;
1115 if (d->descr_count >= d->max_descr_count)
1116 return AVERROR_INVALIDDATA;
1117 ff_mp4_parse_es_descr(&d->pb, &es_id);
1118 d->active_descr = d->descr + (d->descr_count++);
1119
1120 d->active_descr->es_id = es_id;
1121 update_offsets(&d->pb, &off, &len);
1122 parse_mp4_descr(d, off, len, MP4DecConfigDescrTag);
1123 update_offsets(&d->pb, &off, &len);
1124 if (len > 0)
1125 parse_mp4_descr(d, off, len, MP4SLDescrTag);
1126 d->active_descr = NULL;
1127 return 0;
1128 }
1129
1130 static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
1131 int len)
1132 {
1133 Mp4Descr *descr = d->active_descr;
1134 if (!descr)
1135 return AVERROR_INVALIDDATA;
1136 d->active_descr->dec_config_descr = av_malloc(len);
1137 if (!descr->dec_config_descr)
1138 return AVERROR(ENOMEM);
1139 descr->dec_config_descr_len = len;
1140 avio_read(&d->pb, descr->dec_config_descr, len);
1141 return 0;
1142 }
1143
1144 static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
1145 {
1146 Mp4Descr *descr = d->active_descr;
1147 int predefined;
1148 if (!descr)
1149 return AVERROR_INVALIDDATA;
1150
1151 predefined = avio_r8(&d->pb);
1152 if (!predefined) {
1153 int lengths;
1154 int flags = avio_r8(&d->pb);
1155 descr->sl.use_au_start = !!(flags & 0x80);
1156 descr->sl.use_au_end = !!(flags & 0x40);
1157 descr->sl.use_rand_acc_pt = !!(flags & 0x20);
1158 descr->sl.use_padding = !!(flags & 0x08);
1159 descr->sl.use_timestamps = !!(flags & 0x04);
1160 descr->sl.use_idle = !!(flags & 0x02);
1161 descr->sl.timestamp_res = avio_rb32(&d->pb);
1162 avio_rb32(&d->pb);
1163 descr->sl.timestamp_len = avio_r8(&d->pb);
1164 descr->sl.ocr_len = avio_r8(&d->pb);
1165 descr->sl.au_len = avio_r8(&d->pb);
1166 descr->sl.inst_bitrate_len = avio_r8(&d->pb);
1167 lengths = avio_rb16(&d->pb);
1168 descr->sl.degr_prior_len = lengths >> 12;
1169 descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f;
1170 descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
1171 } else {
1172 avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
1173 }
1174 return 0;
1175 }
1176
1177 static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
1178 int target_tag)
1179 {
1180 int tag;
1181 int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
1182 update_offsets(&d->pb, &off, &len);
1183 if (len < 0 || len1 > len || len1 <= 0) {
1184 av_log(d->s, AV_LOG_ERROR,
1185 "Tag %x length violation new length %d bytes remaining %d\n",
1186 tag, len1, len);
1187 return AVERROR_INVALIDDATA;
1188 }
1189
1190 if (d->level++ >= MAX_LEVEL) {
1191 av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
1192 goto done;
1193 }
1194
1195 if (target_tag && tag != target_tag) {
1196 av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
1197 target_tag);
1198 goto done;
1199 }
1200
1201 switch (tag) {
1202 case MP4IODescrTag:
1203 parse_MP4IODescrTag(d, off, len1);
1204 break;
1205 case MP4ODescrTag:
1206 parse_MP4ODescrTag(d, off, len1);
1207 break;
1208 case MP4ESDescrTag:
1209 parse_MP4ESDescrTag(d, off, len1);
1210 break;
1211 case MP4DecConfigDescrTag:
1212 parse_MP4DecConfigDescrTag(d, off, len1);
1213 break;
1214 case MP4SLDescrTag:
1215 parse_MP4SLDescrTag(d, off, len1);
1216 break;
1217 }
1218
1219
1220 done:
1221 d->level--;
1222 avio_seek(&d->pb, off + len1, SEEK_SET);
1223 return 0;
1224 }
1225
1226 static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
1227 Mp4Descr *descr, int *descr_count, int max_descr_count)
1228 {
1229 MP4DescrParseContext d;
1230 int ret;
1231
1232 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1233 if (ret < 0)
1234 return ret;
1235
1236 ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
1237
1238 *descr_count = d.descr_count;
1239 return ret;
1240 }
1241
1242 static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
1243 Mp4Descr *descr, int *descr_count, int max_descr_count)
1244 {
1245 MP4DescrParseContext d;
1246 int ret;
1247
1248 ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
1249 if (ret < 0)
1250 return ret;
1251
1252 ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
1253
1254 *descr_count = d.descr_count;
1255 return ret;
1256 }
1257
1258 static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
1259 int section_len)
1260 {
1261 MpegTSContext *ts = filter->u.section_filter.opaque;
1262 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1263 SectionHeader h;
1264 const uint8_t *p, *p_end;
1265 AVIOContext pb;
1266 int mp4_descr_count = 0;
1267 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1268 int i, pid;
1269 AVFormatContext *s = ts->stream;
1270
1271 p_end = section + section_len - 4;
1272 p = section;
1273 if (parse_section_header(&h, &p, p_end) < 0)
1274 return;
1275 if (h.tid != M4OD_TID)
1276 return;
1277 if (h.version == tssf->last_ver)
1278 return;
1279 tssf->last_ver = h.version;
1280
1281 mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
1282 MAX_MP4_DESCR_COUNT);
1283
1284 for (pid = 0; pid < NB_PID_MAX; pid++) {
1285 if (!ts->pids[pid])
1286 continue;
1287 for (i = 0; i < mp4_descr_count; i++) {
1288 PESContext *pes;
1289 AVStream *st;
1290 if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
1291 continue;
1292 if (!(ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES)) {
1293 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
1294 continue;
1295 }
1296 pes = ts->pids[pid]->u.pes_filter.opaque;
1297 st = pes->st;
1298 if (!st)
1299 continue;
1300
1301 pes->sl = mp4_descr[i].sl;
1302
1303 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1304 mp4_descr[i].dec_config_descr_len, 0,
1305 NULL, NULL, NULL, NULL);
1306 ff_mp4_read_dec_config_descr(s, st, &pb);
1307 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1308 st->codec->extradata_size > 0)
1309 st->need_parsing = 0;
1310 if (st->codec->codec_id == AV_CODEC_ID_H264 &&
1311 st->codec->extradata_size > 0)
1312 st->need_parsing = 0;
1313
1314 if (st->codec->codec_id <= AV_CODEC_ID_NONE) {
1315 // do nothing
1316 } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO)
1317 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1318 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE)
1319 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1320 else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN)
1321 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1322 }
1323 }
1324 for (i = 0; i < mp4_descr_count; i++)
1325 av_free(mp4_descr[i].dec_config_descr);
1326 }
1327
1328 static const uint8_t opus_coupled_stream_cnt[9] = {
1329 1, 0, 1, 1, 2, 2, 2, 3, 3
1330 };
1331
1332 static const uint8_t opus_stream_cnt[9] = {
1333 1, 1, 1, 2, 2, 3, 4, 4, 5,
1334 };
1335
1336 static const uint8_t opus_channel_map[8][8] = {
1337 { 0 },
1338 { 0,1 },
1339 { 0,2,1 },
1340 { 0,1,2,3 },
1341 { 0,4,1,2,3 },
1342 { 0,4,1,2,3,5 },
1343 { 0,4,1,2,3,5,6 },
1344 { 0,6,1,2,3,4,5,7 },
1345 };
1346
1347 int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
1348 const uint8_t **pp, const uint8_t *desc_list_end,
1349 Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
1350 MpegTSContext *ts)
1351 {
1352 const uint8_t *desc_end;
1353 int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
1354 char language[252];
1355 int i;
1356
1357 desc_tag = get8(pp, desc_list_end);
1358 if (desc_tag < 0)
1359 return AVERROR_INVALIDDATA;
1360 desc_len = get8(pp, desc_list_end);
1361 if (desc_len < 0)
1362 return AVERROR_INVALIDDATA;
1363 desc_end = *pp + desc_len;
1364 if (desc_end > desc_list_end)
1365 return AVERROR_INVALIDDATA;
1366
1367 av_log(fc, AV_LOG_TRACE, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
1368
1369 if (st->codec->codec_id == AV_CODEC_ID_NONE &&
1370 stream_type == STREAM_TYPE_PRIVATE_DATA)
1371 mpegts_find_stream_type(st, desc_tag, DESC_types);
1372
1373 switch (desc_tag) {
1374 case 0x1E: /* SL descriptor */
1375 desc_es_id = get16(pp, desc_end);
1376 if (desc_es_id < 0)
1377 break;
1378 if (ts && ts->pids[pid])
1379 ts->pids[pid]->es_id = desc_es_id;
1380 for (i = 0; i < mp4_descr_count; i++)
1381 if (mp4_descr[i].dec_config_descr_len &&
1382 mp4_descr[i].es_id == desc_es_id) {
1383 AVIOContext pb;
1384 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
1385 mp4_descr[i].dec_config_descr_len, 0,
1386 NULL, NULL, NULL, NULL);
1387 ff_mp4_read_dec_config_descr(fc, st, &pb);
1388 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1389 st->codec->extradata_size > 0)
1390 st->need_parsing = 0;
1391 if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
1392 mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
1393 }
1394 break;
1395 case 0x1F: /* FMC descriptor */
1396 if (get16(pp, desc_end) < 0)
1397 break;
1398 if (mp4_descr_count > 0 &&
1399 st->codec->codec_id == AV_CODEC_ID_AAC_LATM &&
1400 mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
1401 AVIOContext pb;
1402 ffio_init_context(&pb, mp4_descr->dec_config_descr,
1403 mp4_descr->dec_config_descr_len, 0,
1404 NULL, NULL, NULL, NULL);
1405 ff_mp4_read_dec_config_descr(fc, st, &pb);
1406 if (st->codec->codec_id == AV_CODEC_ID_AAC &&
1407 st->codec->extradata_size > 0)
1408 st->need_parsing = 0;
1409 }
1410 break;
1411 case 0x56: /* DVB teletext descriptor */
1412 language[0] = get8(pp, desc_end);
1413 language[1] = get8(pp, desc_end);
1414 language[2] = get8(pp, desc_end);
1415 language[3] = 0;
1416 av_dict_set(&st->metadata, "language", language, 0);
1417 break;
1418 case 0x59: /* subtitling descriptor */
1419 language[0] = get8(pp, desc_end);
1420 language[1] = get8(pp, desc_end);
1421 language[2] = get8(pp, desc_end);
1422 language[3] = 0;
1423 /* hearing impaired subtitles detection */
1424 switch (get8(pp, desc_end)) {
1425 case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
1426 case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
1427 case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
1428 case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
1429 case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
1430 case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
1431 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1432 break;
1433 }
1434 if (st->codec->extradata) {
1435 if (st->codec->extradata_size == 4 &&
1436 memcmp(st->codec->extradata, *pp, 4))
1437 avpriv_request_sample(fc, "DVB sub with multiple IDs");
1438 } else {
1439 st->codec->extradata = av_malloc(4 + FF_INPUT_BUFFER_PADDING_SIZE);
1440 if (st->codec->extradata) {
1441 st->codec->extradata_size = 4;
1442 memcpy(st->codec->extradata, *pp, 4);
1443 }
1444 }
1445 *pp += 4;
1446 av_dict_set(&st->metadata, "language", language, 0);
1447 break;
1448 case 0x0a: /* ISO 639 language descriptor */
1449 for (i = 0; i + 4 <= desc_len; i += 4) {
1450 language[i + 0] = get8(pp, desc_end);
1451 language[i + 1] = get8(pp, desc_end);
1452 language[i + 2] = get8(pp, desc_end);
1453 language[i + 3] = ',';
1454 switch (get8(pp, desc_end)) {
1455 case 0x01:
1456 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
1457 break;
1458 case 0x02:
1459 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
1460 break;
1461 case 0x03:
1462 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
1463 break;
1464 }
1465 }
1466 if (i && language[0]) {
1467 language[i - 1] = 0;
1468 av_dict_set(&st->metadata, "language", language, 0);
1469 }
1470 break;
1471 case 0x05: /* registration descriptor */
1472 st->codec->codec_tag = bytestream_get_le32(pp);
1473 av_log(fc, AV_LOG_TRACE, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag);
1474 if (st->codec->codec_id == AV_CODEC_ID_NONE)
1475 mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types);
1476 break;
1477 case 0x7f: /* DVB extension descriptor */
1478 ext_desc_tag = get8(pp, desc_end);
1479 if (ext_desc_tag < 0)
1480 return AVERROR_INVALIDDATA;
1481 if (st->codec->codec_id == AV_CODEC_ID_OPUS &&
1482 ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
1483 if (!st->codec->extradata) {
1484 st->codec->extradata = av_mallocz(sizeof(opus_default_extradata) +
1485 FF_INPUT_BUFFER_PADDING_SIZE);
1486 if (!st->codec->extradata)
1487 return AVERROR(ENOMEM);
1488
1489 st->codec->extradata_size = sizeof(opus_default_extradata);
1490 memcpy(st->codec->extradata, opus_default_extradata, sizeof(opus_default_extradata));
1491
1492 channel_config_code = get8(pp, desc_end);
1493 if (channel_config_code < 0)
1494 return AVERROR_INVALIDDATA;
1495 if (channel_config_code <= 0x8) {
1496 st->codec->extradata[9] = channels = channel_config_code ? channel_config_code : 2;
1497 st->codec->extradata[18] = channel_config_code ? (channels > 2) : 255;
1498 st->codec->extradata[19] = opus_stream_cnt[channel_config_code];
1499 st->codec->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
1500 memcpy(&st->codec->extradata[21], opus_channel_map[channels - 1], channels);
1501 } else {
1502 avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
1503 }
1504 st->need_parsing = AVSTREAM_PARSE_FULL;
1505 }
1506 }
1507 break;
1508 default:
1509 break;
1510 }
1511 *pp = desc_end;
1512 return 0;
1513 }
1514
1515 static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1516 {
1517 MpegTSContext *ts = filter->u.section_filter.opaque;
1518 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1519 SectionHeader h1, *h = &h1;
1520 PESContext *pes;
1521 AVStream *st;
1522 const uint8_t *p, *p_end, *desc_list_end;
1523 int program_info_length, pcr_pid, pid, stream_type;
1524 int desc_list_len;
1525 uint32_t prog_reg_desc = 0; /* registration descriptor */
1526
1527 int mp4_descr_count = 0;
1528 Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
1529 int i;
1530
1531 av_log(ts->stream, AV_LOG_TRACE, "PMT: len %i\n", section_len);
1532 hex_dump_debug(ts->stream, section, section_len);
1533
1534 p_end = section + section_len - 4;
1535 p = section;
1536 if (parse_section_header(h, &p, p_end) < 0)
1537 return;
1538 if (h->version == tssf->last_ver)
1539 return;
1540 tssf->last_ver = h->version;
1541
1542 av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x sec_num=%d/%d\n",
1543 h->id, h->sec_num, h->last_sec_num);
1544
1545 if (h->tid != PMT_TID)
1546 return;
1547
1548 clear_program(ts, h->id);
1549 pcr_pid = get16(&p, p_end);
1550 if (pcr_pid < 0)
1551 return;
1552 pcr_pid &= 0x1fff;
1553 add_pid_to_pmt(ts, h->id, pcr_pid);
1554
1555 av_log(ts->stream, AV_LOG_TRACE, "pcr_pid=0x%x\n", pcr_pid);
1556
1557 program_info_length = get16(&p, p_end);
1558 if (program_info_length < 0)
1559 return;
1560 program_info_length &= 0xfff;
1561 while (program_info_length >= 2) {
1562 uint8_t tag, len;
1563 tag = get8(&p, p_end);
1564 len = get8(&p, p_end);
1565
1566 av_log(ts->stream, AV_LOG_TRACE, "program tag: 0x%02x len=%d\n", tag, len);
1567
1568 if (len > program_info_length - 2)
1569 // something else is broken, exit the program_descriptors_loop
1570 break;
1571 program_info_length -= len + 2;
1572 if (tag == 0x1d) { // IOD descriptor
1573 get8(&p, p_end); // scope
1574 get8(&p, p_end); // label
1575 len -= 2;
1576 mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
1577 &mp4_descr_count, MAX_MP4_DESCR_COUNT);
1578 } else if (tag == 0x05 && len >= 4) { // registration descriptor
1579 prog_reg_desc = bytestream_get_le32(&p);
1580 len -= 4;
1581 }
1582 p += len;
1583 }
1584 p += program_info_length;
1585 if (p >= p_end)
1586 goto out;
1587
1588 // stop parsing after pmt, we found header
1589 if (!ts->stream->nb_streams)
1590 ts->stop_parse = 1;
1591
1592
1593 for (;;) {
1594 st = 0;
1595 pes = NULL;
1596 stream_type = get8(&p, p_end);
1597 if (stream_type < 0)
1598 break;
1599 pid = get16(&p, p_end);
1600 if (pid < 0)
1601 break;
1602 pid &= 0x1fff;
1603
1604 /* now create stream */
1605 if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
1606 pes = ts->pids[pid]->u.pes_filter.opaque;
1607 if (!pes->st) {
1608 pes->st = avformat_new_stream(pes->stream, NULL);
1609 pes->st->id = pes->pid;
1610 }
1611 st = pes->st;
1612 } else if (stream_type != 0x13) {
1613 if (ts->pids[pid])
1614 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
1615 pes = add_pes_stream(ts, pid, pcr_pid);
1616 if (pes) {
1617 st = avformat_new_stream(pes->stream, NULL);
1618 st->id = pes->pid;
1619 }
1620 } else {
1621 int idx = ff_find_stream_index(ts->stream, pid);
1622 if (idx >= 0) {
1623 st = ts->stream->streams[idx];
1624 } else {
1625 st = avformat_new_stream(ts->stream, NULL);
1626 st->id = pid;
1627 st->codec->codec_type = AVMEDIA_TYPE_DATA;
1628 }
1629 }
1630
1631 if (!st)
1632 goto out;
1633
1634 if (pes && !pes->stream_type)
1635 mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
1636
1637 add_pid_to_pmt(ts, h->id, pid);
1638
1639 ff_program_add_stream_index(ts->stream, h->id, st->index);
1640
1641 desc_list_len = get16(&p, p_end);
1642 if (desc_list_len < 0)
1643 break;
1644 desc_list_len &= 0xfff;
1645 desc_list_end = p + desc_list_len;
1646 if (desc_list_end > p_end)
1647 break;
1648 for (;;) {
1649 if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
1650 desc_list_end, mp4_descr,
1651 mp4_descr_count, pid, ts) < 0)
1652 break;
1653
1654 if (pes && prog_reg_desc == AV_RL32("HDMV") &&
1655 stream_type == 0x83 && pes->sub_st) {
1656 ff_program_add_stream_index(ts->stream, h->id,
1657 pes->sub_st->index);
1658 pes->sub_st->codec->codec_tag = st->codec->codec_tag;
1659 }
1660 }
1661 p = desc_list_end;
1662 }
1663
1664 out:
1665 for (i = 0; i < mp4_descr_count; i++)
1666 av_free(mp4_descr[i].dec_config_descr);
1667 }
1668
1669 static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1670 {
1671 MpegTSContext *ts = filter->u.section_filter.opaque;
1672 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1673 SectionHeader h1, *h = &h1;
1674 const uint8_t *p, *p_end;
1675 int sid, pmt_pid;
1676
1677 av_log(ts->stream, AV_LOG_TRACE, "PAT:\n");
1678 hex_dump_debug(ts->stream, section, section_len);
1679
1680 p_end = section + section_len - 4;
1681 p = section;
1682 if (parse_section_header(h, &p, p_end) < 0)
1683 return;
1684 if (h->tid != PAT_TID)
1685 return;
1686 if (h->version == tssf->last_ver)
1687 return;
1688 tssf->last_ver = h->version;
1689
1690 clear_programs(ts);
1691 for (;;) {
1692 sid = get16(&p, p_end);
1693 if (sid < 0)
1694 break;
1695 pmt_pid = get16(&p, p_end);
1696 if (pmt_pid < 0)
1697 break;
1698 pmt_pid &= 0x1fff;
1699
1700 av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
1701
1702 if (sid == 0x0000) {
1703 /* NIT info */
1704 } else {
1705 av_new_program(ts->stream, sid);
1706 if (ts->pids[pmt_pid])
1707 mpegts_close_filter(ts, ts->pids[pmt_pid]);
1708 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
1709 add_pat_entry(ts, sid);
1710 add_pid_to_pmt(ts, sid, 0); // add pat pid to program
1711 add_pid_to_pmt(ts, sid, pmt_pid);
1712 }
1713 }
1714 }
1715
1716 static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
1717 {
1718 MpegTSContext *ts = filter->u.section_filter.opaque;
1719 MpegTSSectionFilter *tssf = &filter->u.section_filter;
1720 SectionHeader h1, *h = &h1;
1721 const uint8_t *p, *p_end, *desc_list_end, *desc_end;
1722 int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
1723 char *name, *provider_name;
1724
1725 av_log(ts->stream, AV_LOG_TRACE, "SDT:\n");
1726 hex_dump_debug(ts->stream, section, section_len);
1727
1728 p_end = section + section_len - 4;
1729 p = section;
1730 if (parse_section_header(h, &p, p_end) < 0)
1731 return;
1732 if (h->tid != SDT_TID)
1733 return;
1734 if (h->version == tssf->last_ver)
1735 return;
1736 tssf->last_ver = h->version;
1737
1738 onid = get16(&p, p_end);
1739 if (onid < 0)
1740 return;
1741 val = get8(&p, p_end);
1742 if (val < 0)
1743 return;
1744 for (;;) {
1745 sid = get16(&p, p_end);
1746 if (sid < 0)
1747 break;
1748 val = get8(&p, p_end);
1749 if (val < 0)
1750 break;
1751 desc_list_len = get16(&p, p_end);
1752 if (desc_list_len < 0)
1753 break;
1754 desc_list_len &= 0xfff;
1755 desc_list_end = p + desc_list_len;
1756 if (desc_list_end > p_end)
1757 break;
1758 for (;;) {
1759 desc_tag = get8(&p, desc_list_end);
1760 if (desc_tag < 0)
1761 break;
1762 desc_len = get8(&p, desc_list_end);
1763 desc_end = p + desc_len;
1764 if (desc_end > desc_list_end)
1765 break;
1766
1767 av_log(ts->stream, AV_LOG_TRACE, "tag: 0x%02x len=%d\n",
1768 desc_tag, desc_len);
1769
1770 switch (desc_tag) {
1771 case 0x48:
1772 service_type = get8(&p, p_end);
1773 if (service_type < 0)
1774 break;
1775 provider_name = getstr8(&p, p_end);
1776 if (!provider_name)
1777 break;
1778 name = getstr8(&p, p_end);
1779 if (name) {
1780 AVProgram *program = av_new_program(ts->stream, sid);
1781 if (program) {
1782 av_dict_set(&program->metadata, "service_name", name, 0);
1783 av_dict_set(&program->metadata, "service_provider",
1784 provider_name, 0);
1785 }
1786 }
1787 av_free(name);
1788 av_free(provider_name);
1789 break;
1790 default:
1791 break;
1792 }
1793 p = desc_end;
1794 }
1795 p = desc_list_end;
1796 }
1797 }
1798
1799 /* handle one TS packet */
1800 static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
1801 {
1802 MpegTSFilter *tss;
1803 int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
1804 has_adaptation, has_payload;
1805 const uint8_t *p, *p_end;
1806 int64_t pos;
1807
1808 pid = AV_RB16(packet + 1) & 0x1fff;
1809 if (pid && discard_pid(ts, pid))
1810 return 0;
1811 is_start = packet[1] & 0x40;
1812 tss = ts->pids[pid];
1813 if (ts->auto_guess && !tss && is_start) {
1814 add_pes_stream(ts, pid, -1);
1815 tss = ts->pids[pid];
1816 }
1817 if (!tss)
1818 return 0;
1819
1820 afc = (packet[3] >> 4) & 3;
1821 if (afc == 0) /* reserved value */
1822 return 0;
1823 has_adaptation = afc & 2;
1824 has_payload = afc & 1;
1825 is_discontinuity = has_adaptation &&
1826 packet[4] != 0 && /* with length > 0 */
1827 (packet[5] & 0x80); /* and discontinuity indicated */
1828
1829 /* continuity check (currently not used) */
1830 cc = (packet[3] & 0xf);
1831 expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
1832 cc_ok = pid == 0x1FFF || // null packet PID
1833 is_discontinuity ||
1834 tss->last_cc < 0 ||
1835 expected_cc == cc;
1836
1837 tss->last_cc = cc;
1838 if (!cc_ok) {
1839 av_log(ts->stream, AV_LOG_WARNING,
1840 "Continuity check failed for pid %d expected %d got %d\n",
1841 pid, expected_cc, cc);
1842 if (tss->type == MPEGTS_PES) {
1843 PESContext *pc = tss->u.pes_filter.opaque;
1844 pc->flags |= AV_PKT_FLAG_CORRUPT;
1845 }
1846 }
1847
1848 if (!has_payload)
1849 return 0;
1850 p = packet + 4;
1851 if (has_adaptation) {
1852 /* skip adaptation field */
1853 p += p[0] + 1;
1854 }
1855 /* if past the end of packet, ignore */
1856 p_end = packet + TS_PACKET_SIZE;
1857 if (p >= p_end)
1858 return 0;
1859
1860 pos = avio_tell(ts->stream->pb);
1861 MOD_UNLIKELY(ts->pos47, pos, ts->raw_packet_size, ts->pos);
1862
1863 if (tss->type == MPEGTS_SECTION) {
1864 if (is_start) {
1865 /* pointer field present */
1866 len = *p++;
1867 if (p + len > p_end)
1868 return 0;
1869 if (len && cc_ok) {
1870 /* write remaining section bytes */
1871 write_section_data(ts, tss,
1872 p, len, 0);
1873 /* check whether filter has been closed */
1874 if (!ts->pids[pid])
1875 return 0;
1876 }
1877 p += len;
1878 if (p < p_end) {
1879 write_section_data(ts, tss,
1880 p, p_end - p, 1);
1881 }
1882 } else {
1883 if (cc_ok) {
1884 write_section_data(ts, tss,
1885 p, p_end - p, 0);
1886 }
1887 }
1888 } else {
1889 int ret;
1890 // Note: The position here points actually behind the current packet.
1891 if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
1892 pos - ts->raw_packet_size)) < 0)
1893 return ret;
1894 }
1895
1896 return 0;
1897 }
1898
1899 /* XXX: try to find a better synchro over several packets (use
1900 * get_packet_size() ?) */
1901 static int mpegts_resync(AVFormatContext *s)
1902 {
1903 MpegTSContext *ts = s->priv_data;
1904 AVIOContext *pb = s->pb;
1905 int c, i;
1906
1907 for (i = 0; i < ts->resync_size; i++) {
1908 c = avio_r8(pb);
1909 if (pb->eof_reached)
1910 return AVERROR_EOF;
1911 if (c == 0x47) {
1912 avio_seek(pb, -1, SEEK_CUR);
1913 return 0;
1914 }
1915 }
1916 av_log(s, AV_LOG_ERROR,
1917 "max resync size reached, could not find sync byte\n");
1918 /* no sync found */
1919 return AVERROR_INVALIDDATA;
1920 }
1921
1922 /* return AVERROR_something if error or EOF. Return 0 if OK. */
1923 static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
1924 const uint8_t **data)
1925 {
1926 AVIOContext *pb = s->pb;
1927 int len;
1928
1929 for (;;) {
1930 len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
1931 if (len != TS_PACKET_SIZE)
1932 return len < 0 ? len : AVERROR_EOF;
1933 /* check packet sync byte */
1934 if ((*data)[0] != 0x47) {
1935 /* find a new packet start */
1936 avio_seek(pb, -TS_PACKET_SIZE, SEEK_CUR);
1937 if (mpegts_resync(s) < 0)
1938 return AVERROR(EAGAIN);
1939 else
1940 continue;
1941 } else {
1942 break;
1943 }
1944 }
1945 return 0;
1946 }
1947
1948 static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
1949 {
1950 AVIOContext *pb = s->pb;
1951 int skip = raw_packet_size - TS_PACKET_SIZE;
1952 if (skip > 0)
1953 avio_skip(pb, skip);
1954 }
1955
1956 static int handle_packets(MpegTSContext *ts, int nb_packets)
1957 {
1958 AVFormatContext *s = ts->stream;
1959 uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
1960 const uint8_t *data;
1961 int packet_num, ret = 0;
1962
1963 if (avio_tell(s->pb) != ts->last_pos) {
1964 int i;
1965 av_log(ts->stream, AV_LOG_TRACE, "Skipping after seek\n");
1966 /* seek detected, flush pes buffer */
1967 for (i = 0; i < NB_PID_MAX; i++) {
1968 if (ts->pids[i]) {
1969 if (ts->pids[i]->type == MPEGTS_PES) {
1970 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
1971 av_buffer_unref(&pes->buffer);
1972 pes->data_index = 0;
1973 pes->state = MPEGTS_SKIP; /* skip until pes header */
1974 }
1975 ts->pids[i]->last_cc = -1;
1976 }
1977 }
1978 }
1979
1980 ts->stop_parse = 0;
1981 packet_num = 0;
1982 memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE);
1983 for (;;) {
1984 if (ts->stop_parse > 0)
1985 break;
1986 packet_num++;
1987 if (nb_packets != 0 && packet_num >= nb_packets)
1988 break;
1989 ret = read_packet(s, packet, ts->raw_packet_size, &data);
1990 if (ret != 0)
1991 break;
1992 ret = handle_packet(ts, data);
1993 finished_reading_packet(s, ts->raw_packet_size);
1994 if (ret != 0)
1995 break;
1996 }
1997 ts->last_pos = avio_tell(s->pb);
1998 return ret;
1999 }
2000
2001 static int mpegts_probe(AVProbeData *p)
2002 {
2003 const int size = p->buf_size;
2004 int score, fec_score, dvhs_score;
2005 int check_count = size / TS_FEC_PACKET_SIZE;
2006 #define CHECK_COUNT 10
2007
2008 if (check_count < CHECK_COUNT)
2009 return AVERROR_INVALIDDATA;
2010
2011 score = analyze(p->buf, TS_PACKET_SIZE * check_count,
2012 TS_PACKET_SIZE, NULL, 1) * CHECK_COUNT / check_count;
2013 dvhs_score = analyze(p->buf, TS_DVHS_PACKET_SIZE * check_count,
2014 TS_DVHS_PACKET_SIZE, NULL, 1) * CHECK_COUNT / check_count;
2015 fec_score = analyze(p->buf, TS_FEC_PACKET_SIZE * check_count,
2016 TS_FEC_PACKET_SIZE, NULL, 1) * CHECK_COUNT / check_count;
2017 av_log(NULL, AV_LOG_TRACE, "score: %d, dvhs_score: %d, fec_score: %d \n",
2018 score, dvhs_score, fec_score);
2019
2020 /* we need a clear definition for the returned score otherwise
2021 * things will become messy sooner or later */
2022 if (score > fec_score && score > dvhs_score && score > 6)
2023 return AVPROBE_SCORE_MAX + score - CHECK_COUNT;
2024 else if (dvhs_score > score && dvhs_score > fec_score && dvhs_score > 6)
2025 return AVPROBE_SCORE_MAX + dvhs_score - CHECK_COUNT;
2026 else if (fec_score > 6)
2027 return AVPROBE_SCORE_MAX + fec_score - CHECK_COUNT;
2028 else
2029 return AVERROR_INVALIDDATA;
2030 }
2031
2032 /* return the 90kHz PCR and the extension for the 27MHz PCR. return
2033 * (-1) if not available */
2034 static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
2035 {
2036 int afc, len, flags;
2037 const uint8_t *p;
2038 unsigned int v;
2039
2040 afc = (packet[3] >> 4) & 3;
2041 if (afc <= 1)
2042 return AVERROR_INVALIDDATA;
2043 p = packet + 4;
2044 len = p[0];
2045 p++;
2046 if (len == 0)
2047 return AVERROR_INVALIDDATA;
2048 flags = *p++;
2049 len--;
2050 if (!(flags & 0x10))
2051 return AVERROR_INVALIDDATA;
2052 if (len < 6)
2053 return AVERROR_INVALIDDATA;
2054 v = AV_RB32(p);
2055 *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
2056 *ppcr_low = ((p[4] & 1) << 8) | p[5];
2057 return 0;
2058 }
2059
2060 static int mpegts_read_header(AVFormatContext *s)
2061 {
2062 MpegTSContext *ts = s->priv_data;
2063 AVIOContext *pb = s->pb;
2064 uint8_t buf[5 * 1024];
2065 int len;
2066 int64_t pos;
2067
2068 /* read the first 1024 bytes to get packet size */
2069 pos = avio_tell(pb);
2070 len = avio_read(pb, buf, sizeof(buf));
2071 if (len < 0)
2072 return len;
2073 if (len != sizeof(buf))
2074 return AVERROR_BUG;
2075 ts->raw_packet_size = get_packet_size(buf, sizeof(buf));
2076 if (ts->raw_packet_size <= 0)
2077 return AVERROR_INVALIDDATA;
2078 ts->stream = s;
2079 ts->auto_guess = 0;
2080
2081 if (s->iformat == &ff_mpegts_demuxer) {
2082 /* normal demux */
2083
2084 /* first do a scan to get all the services */
2085 if (avio_seek(pb, pos, SEEK_SET) < 0 && pb->seekable)
2086 av_log(s, AV_LOG_ERROR, "Unable to seek back to the start\n");
2087
2088 mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
2089
2090 mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
2091
2092 handle_packets(ts, s->probesize / ts->raw_packet_size);
2093 /* if could not find service, enable auto_guess */
2094
2095 ts->auto_guess = 1;
2096
2097 av_log(ts->stream, AV_LOG_TRACE, "tuning done\n");
2098
2099 s->ctx_flags |= AVFMTCTX_NOHEADER;
2100 } else {
2101 AVStream *st;
2102 int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
2103 int64_t pcrs[2], pcr_h;
2104 int packet_count[2];
2105 uint8_t packet[TS_PACKET_SIZE];
2106 const uint8_t *data;
2107
2108 /* only read packets */
2109
2110 st = avformat_new_stream(s, NULL);
2111 if (!st)
2112 return AVERROR(ENOMEM);
2113 avpriv_set_pts_info(st, 60, 1, 27000000);
2114 st->codec->codec_type = AVMEDIA_TYPE_DATA;
2115 st->codec->codec_id = AV_CODEC_ID_MPEG2TS;
2116
2117 /* we iterate until we find two PCRs to estimate the bitrate */
2118 pcr_pid = -1;
2119 nb_pcrs = 0;
2120 nb_packets = 0;
2121 for (;;) {
2122 ret = read_packet(s, packet, ts->raw_packet_size, &data);
2123 if (ret < 0)
2124 return ret;
2125 pid = AV_RB16(data + 1) & 0x1fff;
2126 if ((pcr_pid == -1 || pcr_pid == pid) &&
2127 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
2128 finished_reading_packet(s, ts->raw_packet_size);
2129 pcr_pid = pid;
2130 packet_count[nb_pcrs] = nb_packets;
2131 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
2132 nb_pcrs++;
2133 if (nb_pcrs >= 2)
2134 break;
2135 } else {
2136 finished_reading_packet(s, ts->raw_packet_size);
2137 }
2138 nb_packets++;
2139 }
2140
2141 /* NOTE1: the bitrate is computed without the FEC */
2142 /* NOTE2: it is only the bitrate of the start of the stream */
2143 ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
2144 ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0];
2145 s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr;
2146 st->codec->bit_rate = s->bit_rate;
2147 st->start_time = ts->cur_pcr;
2148 av_log(ts->stream, AV_LOG_TRACE, "start=%0.3f pcr=%0.3f incr=%d\n",
2149 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
2150 }
2151
2152 avio_seek(pb, pos, SEEK_SET);
2153 return 0;
2154 }
2155
2156 #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
2157
2158 static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
2159 {
2160 MpegTSContext *ts = s->priv_data;
2161 int ret, i;
2162 int64_t pcr_h, next_pcr_h, pos;
2163 int pcr_l, next_pcr_l;
2164 uint8_t pcr_buf[12];
2165 const uint8_t *data;
2166
2167 if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
2168 return AVERROR(ENOMEM);
2169 ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
2170 pkt->pos = avio_tell(s->pb);
2171 if (ret < 0) {
2172 av_free_packet(pkt);
2173 return ret;
2174 }
2175 if (data != pkt->data)
2176 memcpy(pkt->data, data, ts->raw_packet_size);
2177 finished_reading_packet(s, ts->raw_packet_size);
2178 if (ts->mpeg2ts_compute_pcr) {
2179 /* compute exact PCR for each packet */
2180 if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
2181 /* we read the next PCR (XXX: optimize it by using a bigger buffer */
2182 pos = avio_tell(s->pb);
2183 for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
2184 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
2185 avio_read(s->pb, pcr_buf, 12);
2186 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
2187 /* XXX: not precise enough */
2188 ts->pcr_incr =
2189 ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
2190 (i + 1);
2191 break;
2192 }
2193 }
2194 avio_seek(s->pb, pos, SEEK_SET);
2195 /* no next PCR found: we use previous increment */
2196 ts->cur_pcr = pcr_h * 300 + pcr_l;
2197 }
2198 pkt->pts = ts->cur_pcr;
2199 pkt->duration = ts->pcr_incr;
2200 ts->cur_pcr += ts->pcr_incr;
2201 }
2202 pkt->stream_index = 0;
2203 return 0;
2204 }
2205
2206 static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
2207 {
2208 MpegTSContext *ts = s->priv_data;
2209 int ret, i;
2210
2211 pkt->size = -1;
2212 ts->pkt = pkt;
2213 ret = handle_packets(ts, 0);
2214 if (ret < 0) {
2215 /* flush pes data left */
2216 for (i = 0; i < NB_PID_MAX; i++)
2217 if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
2218 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
2219 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
2220 new_pes_packet(pes, pkt);
2221 pes->state = MPEGTS_SKIP;
2222 ret = 0;
2223 break;
2224 }
2225 }
2226 }
2227
2228 if (!ret && pkt->size < 0)
2229 ret = AVERROR(EINTR);
2230 return ret;
2231 }
2232
2233 static void mpegts_free(MpegTSContext *ts)
2234 {
2235 int i;
2236
2237 clear_programs(ts);
2238
2239 for (i = 0; i < NB_PID_MAX; i++)
2240 if (ts->pids[i])
2241 mpegts_close_filter(ts, ts->pids[i]);
2242 }
2243
2244 static int mpegts_read_close(AVFormatContext *s)
2245 {
2246 MpegTSContext *ts = s->priv_data;
2247 mpegts_free(ts);
2248 return 0;
2249 }
2250
2251 static int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
2252 int64_t *ppos, int64_t pos_limit)
2253 {
2254 MpegTSContext *ts = s->priv_data;
2255 int64_t pos, timestamp;
2256 uint8_t buf[TS_PACKET_SIZE];
2257 int pcr_l, pcr_pid =
2258 ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
2259 const int find_next = 1;
2260 pos =
2261 ((*ppos + ts->raw_packet_size - 1 - ts->pos47) / ts->raw_packet_size) *
2262 ts->raw_packet_size + ts->pos47;
2263 if (find_next) {
2264 for (;;) {
2265 avio_seek(s->pb, pos, SEEK_SET);
2266 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2267 return AV_NOPTS_VALUE;
2268 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2269 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2270 break;
2271 }
2272 pos += ts->raw_packet_size;
2273 }
2274 } else {
2275 for (;;) {
2276 pos -= ts->raw_packet_size;
2277 if (pos < 0)
2278 return AV_NOPTS_VALUE;
2279 avio_seek(s->pb, pos, SEEK_SET);
2280 if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
2281 return AV_NOPTS_VALUE;
2282 if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
2283 parse_pcr(&timestamp, &pcr_l, buf) == 0) {
2284 break;
2285 }
2286 }
2287 }
2288 *ppos = pos;
2289
2290 return timestamp;
2291 }
2292
2293 static int read_seek(AVFormatContext *s, int stream_index, int64_t target_ts, int flags)
2294 {
2295 MpegTSContext *ts = s->priv_data;
2296 uint8_t buf[TS_PACKET_SIZE];
2297 int64_t pos;
2298 int ret;
2299
2300 ret = ff_seek_frame_binary(s, stream_index, target_ts, flags);
2301 if (ret < 0)
2302 return ret;
2303
2304 pos = avio_tell(s->pb);
2305
2306 for (;;) {
2307 avio_seek(s->pb, pos, SEEK_SET);
2308 ret = avio_read(s->pb, buf, TS_PACKET_SIZE);
2309 if (ret < 0)
2310 return ret;
2311 if (ret != TS_PACKET_SIZE)
2312 return AVERROR_EOF;
2313 // pid = AV_RB16(buf + 1) & 0x1fff;
2314 if (buf[1] & 0x40)
2315 break;
2316 pos += ts->raw_packet_size;
2317 }
2318 avio_seek(s->pb, pos, SEEK_SET);
2319
2320 return 0;
2321 }
2322
2323 /**************************************************************/
2324 /* parsing functions - called from other demuxers such as RTP */
2325
2326 MpegTSContext *ff_mpegts_parse_open(AVFormatContext *s)
2327 {
2328 MpegTSContext *ts;
2329
2330 ts = av_mallocz(sizeof(MpegTSContext));
2331 if (!ts)
2332 return NULL;
2333 /* no stream case, currently used by RTP */
2334 ts->raw_packet_size = TS_PACKET_SIZE;
2335 ts->stream = s;
2336 ts->auto_guess = 1;
2337 return ts;
2338 }
2339
2340 /* return the consumed length if a packet was output, or -1 if no
2341 * packet is output */
2342 int ff_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
2343 const uint8_t *buf, int len)
2344 {
2345 int len1;
2346
2347 len1 = len;
2348 ts->pkt = pkt;
2349 ts->stop_parse = 0;
2350 for (;;) {
2351 if (ts->stop_parse > 0)
2352 break;
2353 if (len < TS_PACKET_SIZE)
2354 return AVERROR_INVALIDDATA;
2355 if (buf[0] != 0x47) {
2356 buf++;
2357 len--;
2358 } else {
2359 handle_packet(ts, buf);
2360 buf += TS_PACKET_SIZE;
2361 len -= TS_PACKET_SIZE;
2362 }
2363 }
2364 return len1 - len;
2365 }
2366
2367 void ff_mpegts_parse_close(MpegTSContext *ts)
2368 {
2369 mpegts_free(ts);
2370 av_free(ts);
2371 }
2372
2373 AVInputFormat ff_mpegts_demuxer = {
2374 .name = "mpegts",
2375 .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
2376 .priv_data_size = sizeof(MpegTSContext),
2377 .read_probe = mpegts_probe,
2378 .read_header = mpegts_read_header,
2379 .read_packet = mpegts_read_packet,
2380 .read_close = mpegts_read_close,
2381 .read_seek = read_seek,
2382 .read_timestamp = mpegts_get_pcr,
2383 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2384 .priv_class = &mpegts_class,
2385 };
2386
2387 AVInputFormat ff_mpegtsraw_demuxer = {
2388 .name = "mpegtsraw",
2389 .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
2390 .priv_data_size = sizeof(MpegTSContext),
2391 .read_header = mpegts_read_header,
2392 .read_packet = mpegts_raw_read_packet,
2393 .read_close = mpegts_read_close,
2394 .read_seek = read_seek,
2395 .read_timestamp = mpegts_get_pcr,
2396 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
2397 .priv_class = &mpegtsraw_class,
2398 };
Libav master