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1 | /* |
2 | * MPEG2 transport stream (aka DVB) demuxer | |
3 | * Copyright (c) 2002-2003 Fabrice Bellard | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include "libavutil/buffer.h" | |
23 | #include "libavutil/crc.h" | |
24 | #include "libavutil/intreadwrite.h" | |
25 | #include "libavutil/log.h" | |
26 | #include "libavutil/dict.h" | |
27 | #include "libavutil/mathematics.h" | |
28 | #include "libavutil/opt.h" | |
29 | #include "libavutil/avassert.h" | |
30 | #include "libavcodec/bytestream.h" | |
31 | #include "libavcodec/get_bits.h" | |
32 | #include "avformat.h" | |
33 | #include "mpegts.h" | |
34 | #include "internal.h" | |
35 | #include "avio_internal.h" | |
36 | #include "seek.h" | |
37 | #include "mpeg.h" | |
38 | #include "isom.h" | |
39 | ||
40 | /* maximum size in which we look for synchronisation if | |
41 | * synchronisation is lost */ | |
42 | #define MAX_RESYNC_SIZE 65536 | |
43 | ||
44 | #define MAX_PES_PAYLOAD 200 * 1024 | |
45 | ||
46 | #define MAX_MP4_DESCR_COUNT 16 | |
47 | ||
48 | #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend) \ | |
49 | do { \ | |
50 | if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \ | |
51 | (modulus) = (dividend) % (divisor); \ | |
52 | (prev_dividend) = (dividend); \ | |
53 | } while (0) | |
54 | ||
55 | enum MpegTSFilterType { | |
56 | MPEGTS_PES, | |
57 | MPEGTS_SECTION, | |
58 | MPEGTS_PCR, | |
59 | }; | |
60 | ||
61 | typedef struct MpegTSFilter MpegTSFilter; | |
62 | ||
63 | typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len, | |
64 | int is_start, int64_t pos); | |
65 | ||
66 | typedef struct MpegTSPESFilter { | |
67 | PESCallback *pes_cb; | |
68 | void *opaque; | |
69 | } MpegTSPESFilter; | |
70 | ||
71 | typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len); | |
72 | ||
73 | typedef void SetServiceCallback (void *opaque, int ret); | |
74 | ||
75 | typedef struct MpegTSSectionFilter { | |
76 | int section_index; | |
77 | int section_h_size; | |
78 | uint8_t *section_buf; | |
79 | unsigned int check_crc : 1; | |
80 | unsigned int end_of_section_reached : 1; | |
81 | SectionCallback *section_cb; | |
82 | void *opaque; | |
83 | } MpegTSSectionFilter; | |
84 | ||
85 | struct MpegTSFilter { | |
86 | int pid; | |
87 | int es_id; | |
88 | int last_cc; /* last cc code (-1 if first packet) */ | |
89 | int64_t last_pcr; | |
90 | enum MpegTSFilterType type; | |
91 | union { | |
92 | MpegTSPESFilter pes_filter; | |
93 | MpegTSSectionFilter section_filter; | |
94 | } u; | |
95 | }; | |
96 | ||
97 | #define MAX_PIDS_PER_PROGRAM 64 | |
98 | struct Program { | |
99 | unsigned int id; // program id/service id | |
100 | unsigned int nb_pids; | |
101 | unsigned int pids[MAX_PIDS_PER_PROGRAM]; | |
102 | ||
103 | /** have we found pmt for this program */ | |
104 | int pmt_found; | |
105 | }; | |
106 | ||
107 | struct MpegTSContext { | |
108 | const AVClass *class; | |
109 | /* user data */ | |
110 | AVFormatContext *stream; | |
111 | /** raw packet size, including FEC if present */ | |
112 | int raw_packet_size; | |
113 | ||
114 | int size_stat[3]; | |
115 | int size_stat_count; | |
116 | #define SIZE_STAT_THRESHOLD 10 | |
117 | ||
118 | int64_t pos47_full; | |
119 | ||
120 | /** if true, all pids are analyzed to find streams */ | |
121 | int auto_guess; | |
122 | ||
123 | /** compute exact PCR for each transport stream packet */ | |
124 | int mpeg2ts_compute_pcr; | |
125 | ||
126 | /** fix dvb teletext pts */ | |
127 | int fix_teletext_pts; | |
128 | ||
129 | int64_t cur_pcr; /**< used to estimate the exact PCR */ | |
130 | int pcr_incr; /**< used to estimate the exact PCR */ | |
131 | ||
132 | /* data needed to handle file based ts */ | |
133 | /** stop parsing loop */ | |
134 | int stop_parse; | |
135 | /** packet containing Audio/Video data */ | |
136 | AVPacket *pkt; | |
137 | /** to detect seek */ | |
138 | int64_t last_pos; | |
139 | ||
140 | int skip_changes; | |
141 | int skip_clear; | |
142 | ||
143 | int resync_size; | |
144 | ||
145 | /******************************************/ | |
146 | /* private mpegts data */ | |
147 | /* scan context */ | |
148 | /** structure to keep track of Program->pids mapping */ | |
149 | unsigned int nb_prg; | |
150 | struct Program *prg; | |
151 | ||
152 | int8_t crc_validity[NB_PID_MAX]; | |
153 | /** filters for various streams specified by PMT + for the PAT and PMT */ | |
154 | MpegTSFilter *pids[NB_PID_MAX]; | |
155 | int current_pid; | |
156 | }; | |
157 | ||
158 | #define MPEGTS_OPTIONS \ | |
159 | { "resync_size", "Size limit for looking up a new synchronization.", offsetof(MpegTSContext, resync_size), AV_OPT_TYPE_INT, { .i64 = MAX_RESYNC_SIZE}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM } | |
160 | ||
161 | static const AVOption options[] = { | |
162 | MPEGTS_OPTIONS, | |
163 | {"fix_teletext_pts", "Try to fix pts values of dvb teletext streams.", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_INT, | |
164 | {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM }, | |
165 | {"ts_packetsize", "Output option carrying the raw packet size.", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT, | |
166 | {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY }, | |
167 | {"skip_changes", "Skip changing / adding streams / programs.", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_INT, | |
168 | {.i64 = 0}, 0, 1, 0 }, | |
169 | {"skip_clear", "Skip clearing programs.", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_INT, | |
170 | {.i64 = 0}, 0, 1, 0 }, | |
171 | { NULL }, | |
172 | }; | |
173 | ||
174 | static const AVClass mpegts_class = { | |
175 | .class_name = "mpegts demuxer", | |
176 | .item_name = av_default_item_name, | |
177 | .option = options, | |
178 | .version = LIBAVUTIL_VERSION_INT, | |
179 | }; | |
180 | ||
181 | static const AVOption raw_options[] = { | |
182 | MPEGTS_OPTIONS, | |
183 | { "compute_pcr", "Compute exact PCR for each transport stream packet.", | |
184 | offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_INT, | |
185 | { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM }, | |
186 | { "ts_packetsize", "Output option carrying the raw packet size.", | |
187 | offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT, | |
188 | { .i64 = 0 }, 0, 0, | |
189 | AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY }, | |
190 | { NULL }, | |
191 | }; | |
192 | ||
193 | static const AVClass mpegtsraw_class = { | |
194 | .class_name = "mpegtsraw demuxer", | |
195 | .item_name = av_default_item_name, | |
196 | .option = raw_options, | |
197 | .version = LIBAVUTIL_VERSION_INT, | |
198 | }; | |
199 | ||
200 | /* TS stream handling */ | |
201 | ||
202 | enum MpegTSState { | |
203 | MPEGTS_HEADER = 0, | |
204 | MPEGTS_PESHEADER, | |
205 | MPEGTS_PESHEADER_FILL, | |
206 | MPEGTS_PAYLOAD, | |
207 | MPEGTS_SKIP, | |
208 | }; | |
209 | ||
210 | /* enough for PES header + length */ | |
211 | #define PES_START_SIZE 6 | |
212 | #define PES_HEADER_SIZE 9 | |
213 | #define MAX_PES_HEADER_SIZE (9 + 255) | |
214 | ||
215 | typedef struct PESContext { | |
216 | int pid; | |
217 | int pcr_pid; /**< if -1 then all packets containing PCR are considered */ | |
218 | int stream_type; | |
219 | MpegTSContext *ts; | |
220 | AVFormatContext *stream; | |
221 | AVStream *st; | |
222 | AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */ | |
223 | enum MpegTSState state; | |
224 | /* used to get the format */ | |
225 | int data_index; | |
226 | int flags; /**< copied to the AVPacket flags */ | |
227 | int total_size; | |
228 | int pes_header_size; | |
229 | int extended_stream_id; | |
230 | int64_t pts, dts; | |
231 | int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */ | |
232 | uint8_t header[MAX_PES_HEADER_SIZE]; | |
233 | AVBufferRef *buffer; | |
234 | SLConfigDescr sl; | |
235 | } PESContext; | |
236 | ||
237 | extern AVInputFormat ff_mpegts_demuxer; | |
238 | ||
239 | static struct Program * get_program(MpegTSContext *ts, unsigned int programid) | |
240 | { | |
241 | int i; | |
242 | for (i = 0; i < ts->nb_prg; i++) { | |
243 | if (ts->prg[i].id == programid) { | |
244 | return &ts->prg[i]; | |
245 | } | |
246 | } | |
247 | return NULL; | |
248 | } | |
249 | ||
250 | static void clear_avprogram(MpegTSContext *ts, unsigned int programid) | |
251 | { | |
252 | AVProgram *prg = NULL; | |
253 | int i; | |
254 | ||
255 | for (i = 0; i < ts->stream->nb_programs; i++) | |
256 | if (ts->stream->programs[i]->id == programid) { | |
257 | prg = ts->stream->programs[i]; | |
258 | break; | |
259 | } | |
260 | if (!prg) | |
261 | return; | |
262 | prg->nb_stream_indexes = 0; | |
263 | } | |
264 | ||
265 | static void clear_program(MpegTSContext *ts, unsigned int programid) | |
266 | { | |
267 | int i; | |
268 | ||
269 | clear_avprogram(ts, programid); | |
270 | for (i = 0; i < ts->nb_prg; i++) | |
271 | if (ts->prg[i].id == programid) { | |
272 | ts->prg[i].nb_pids = 0; | |
273 | ts->prg[i].pmt_found = 0; | |
274 | } | |
275 | } | |
276 | ||
277 | static void clear_programs(MpegTSContext *ts) | |
278 | { | |
279 | av_freep(&ts->prg); | |
280 | ts->nb_prg = 0; | |
281 | } | |
282 | ||
283 | static void add_pat_entry(MpegTSContext *ts, unsigned int programid) | |
284 | { | |
285 | struct Program *p; | |
286 | if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) { | |
287 | ts->nb_prg = 0; | |
288 | return; | |
289 | } | |
290 | p = &ts->prg[ts->nb_prg]; | |
291 | p->id = programid; | |
292 | p->nb_pids = 0; | |
293 | p->pmt_found = 0; | |
294 | ts->nb_prg++; | |
295 | } | |
296 | ||
297 | static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid, | |
298 | unsigned int pid) | |
299 | { | |
300 | struct Program *p = get_program(ts, programid); | |
301 | if (!p) | |
302 | return; | |
303 | ||
304 | if (p->nb_pids >= MAX_PIDS_PER_PROGRAM) | |
305 | return; | |
306 | p->pids[p->nb_pids++] = pid; | |
307 | } | |
308 | ||
309 | static void set_pmt_found(MpegTSContext *ts, unsigned int programid) | |
310 | { | |
311 | struct Program *p = get_program(ts, programid); | |
312 | if (!p) | |
313 | return; | |
314 | ||
315 | p->pmt_found = 1; | |
316 | } | |
317 | ||
318 | static void set_pcr_pid(AVFormatContext *s, unsigned int programid, unsigned int pid) | |
319 | { | |
320 | int i; | |
321 | for (i = 0; i < s->nb_programs; i++) { | |
322 | if (s->programs[i]->id == programid) { | |
323 | s->programs[i]->pcr_pid = pid; | |
324 | break; | |
325 | } | |
326 | } | |
327 | } | |
328 | ||
329 | /** | |
330 | * @brief discard_pid() decides if the pid is to be discarded according | |
331 | * to caller's programs selection | |
332 | * @param ts : - TS context | |
333 | * @param pid : - pid | |
334 | * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL | |
335 | * 0 otherwise | |
336 | */ | |
337 | static int discard_pid(MpegTSContext *ts, unsigned int pid) | |
338 | { | |
339 | int i, j, k; | |
340 | int used = 0, discarded = 0; | |
341 | struct Program *p; | |
342 | ||
343 | /* If none of the programs have .discard=AVDISCARD_ALL then there's | |
344 | * no way we have to discard this packet */ | |
345 | for (k = 0; k < ts->stream->nb_programs; k++) | |
346 | if (ts->stream->programs[k]->discard == AVDISCARD_ALL) | |
347 | break; | |
348 | if (k == ts->stream->nb_programs) | |
349 | return 0; | |
350 | ||
351 | for (i = 0; i < ts->nb_prg; i++) { | |
352 | p = &ts->prg[i]; | |
353 | for (j = 0; j < p->nb_pids; j++) { | |
354 | if (p->pids[j] != pid) | |
355 | continue; | |
356 | // is program with id p->id set to be discarded? | |
357 | for (k = 0; k < ts->stream->nb_programs; k++) { | |
358 | if (ts->stream->programs[k]->id == p->id) { | |
359 | if (ts->stream->programs[k]->discard == AVDISCARD_ALL) | |
360 | discarded++; | |
361 | else | |
362 | used++; | |
363 | } | |
364 | } | |
365 | } | |
366 | } | |
367 | ||
368 | return !used && discarded; | |
369 | } | |
370 | ||
371 | /** | |
372 | * Assemble PES packets out of TS packets, and then call the "section_cb" | |
373 | * function when they are complete. | |
374 | */ | |
375 | static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1, | |
376 | const uint8_t *buf, int buf_size, int is_start) | |
377 | { | |
378 | MpegTSSectionFilter *tss = &tss1->u.section_filter; | |
379 | int len; | |
380 | ||
381 | if (is_start) { | |
382 | memcpy(tss->section_buf, buf, buf_size); | |
383 | tss->section_index = buf_size; | |
384 | tss->section_h_size = -1; | |
385 | tss->end_of_section_reached = 0; | |
386 | } else { | |
387 | if (tss->end_of_section_reached) | |
388 | return; | |
389 | len = 4096 - tss->section_index; | |
390 | if (buf_size < len) | |
391 | len = buf_size; | |
392 | memcpy(tss->section_buf + tss->section_index, buf, len); | |
393 | tss->section_index += len; | |
394 | } | |
395 | ||
396 | /* compute section length if possible */ | |
397 | if (tss->section_h_size == -1 && tss->section_index >= 3) { | |
398 | len = (AV_RB16(tss->section_buf + 1) & 0xfff) + 3; | |
399 | if (len > 4096) | |
400 | return; | |
401 | tss->section_h_size = len; | |
402 | } | |
403 | ||
404 | if (tss->section_h_size != -1 && | |
405 | tss->section_index >= tss->section_h_size) { | |
406 | int crc_valid = 1; | |
407 | tss->end_of_section_reached = 1; | |
408 | ||
409 | if (tss->check_crc) { | |
410 | crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, tss->section_buf, tss->section_h_size); | |
411 | if (crc_valid) { | |
412 | ts->crc_validity[ tss1->pid ] = 100; | |
413 | }else if (ts->crc_validity[ tss1->pid ] > -10) { | |
414 | ts->crc_validity[ tss1->pid ]--; | |
415 | }else | |
416 | crc_valid = 2; | |
417 | } | |
418 | if (crc_valid) | |
419 | tss->section_cb(tss1, tss->section_buf, tss->section_h_size); | |
420 | } | |
421 | } | |
422 | ||
423 | static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid, | |
424 | enum MpegTSFilterType type) | |
425 | { | |
426 | MpegTSFilter *filter; | |
427 | ||
428 | av_dlog(ts->stream, "Filter: pid=0x%x\n", pid); | |
429 | ||
430 | if (pid >= NB_PID_MAX || ts->pids[pid]) | |
431 | return NULL; | |
432 | filter = av_mallocz(sizeof(MpegTSFilter)); | |
433 | if (!filter) | |
434 | return NULL; | |
435 | ts->pids[pid] = filter; | |
436 | ||
437 | filter->type = type; | |
438 | filter->pid = pid; | |
439 | filter->es_id = -1; | |
440 | filter->last_cc = -1; | |
441 | filter->last_pcr= -1; | |
442 | ||
443 | return filter; | |
444 | } | |
445 | ||
446 | static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts, | |
447 | unsigned int pid, | |
448 | SectionCallback *section_cb, | |
449 | void *opaque, | |
450 | int check_crc) | |
451 | { | |
452 | MpegTSFilter *filter; | |
453 | MpegTSSectionFilter *sec; | |
454 | ||
455 | if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION))) | |
456 | return NULL; | |
457 | sec = &filter->u.section_filter; | |
458 | sec->section_cb = section_cb; | |
459 | sec->opaque = opaque; | |
460 | sec->section_buf = av_malloc(MAX_SECTION_SIZE); | |
461 | sec->check_crc = check_crc; | |
462 | if (!sec->section_buf) { | |
463 | av_free(filter); | |
464 | return NULL; | |
465 | } | |
466 | return filter; | |
467 | } | |
468 | ||
469 | static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid, | |
470 | PESCallback *pes_cb, | |
471 | void *opaque) | |
472 | { | |
473 | MpegTSFilter *filter; | |
474 | MpegTSPESFilter *pes; | |
475 | ||
476 | if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES))) | |
477 | return NULL; | |
478 | ||
479 | pes = &filter->u.pes_filter; | |
480 | pes->pes_cb = pes_cb; | |
481 | pes->opaque = opaque; | |
482 | return filter; | |
483 | } | |
484 | ||
485 | static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid) | |
486 | { | |
487 | return mpegts_open_filter(ts, pid, MPEGTS_PCR); | |
488 | } | |
489 | ||
490 | static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter) | |
491 | { | |
492 | int pid; | |
493 | ||
494 | pid = filter->pid; | |
495 | if (filter->type == MPEGTS_SECTION) | |
496 | av_freep(&filter->u.section_filter.section_buf); | |
497 | else if (filter->type == MPEGTS_PES) { | |
498 | PESContext *pes = filter->u.pes_filter.opaque; | |
499 | av_buffer_unref(&pes->buffer); | |
500 | /* referenced private data will be freed later in | |
501 | * avformat_close_input */ | |
502 | if (!((PESContext *)filter->u.pes_filter.opaque)->st) { | |
503 | av_freep(&filter->u.pes_filter.opaque); | |
504 | } | |
505 | } | |
506 | ||
507 | av_free(filter); | |
508 | ts->pids[pid] = NULL; | |
509 | } | |
510 | ||
511 | static int analyze(const uint8_t *buf, int size, int packet_size, int *index) | |
512 | { | |
513 | int stat[TS_MAX_PACKET_SIZE]; | |
514 | int stat_all = 0; | |
515 | int i; | |
516 | int best_score = 0; | |
517 | ||
518 | memset(stat, 0, packet_size * sizeof(*stat)); | |
519 | ||
520 | for (i = 0; i < size - 3; i++) { | |
521 | if (buf[i] == 0x47 && !(buf[i + 1] & 0x80) && buf[i + 3] != 0x47) { | |
522 | int x = i % packet_size; | |
523 | stat[x]++; | |
524 | stat_all++; | |
525 | if (stat[x] > best_score) { | |
526 | best_score = stat[x]; | |
527 | if (index) | |
528 | *index = x; | |
529 | } | |
530 | } | |
531 | } | |
532 | ||
533 | return best_score - FFMAX(stat_all - 10*best_score, 0)/10; | |
534 | } | |
535 | ||
536 | /* autodetect fec presence. Must have at least 1024 bytes */ | |
537 | static int get_packet_size(const uint8_t *buf, int size) | |
538 | { | |
539 | int score, fec_score, dvhs_score; | |
540 | ||
541 | if (size < (TS_FEC_PACKET_SIZE * 5 + 1)) | |
542 | return AVERROR_INVALIDDATA; | |
543 | ||
544 | score = analyze(buf, size, TS_PACKET_SIZE, NULL); | |
545 | dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, NULL); | |
546 | fec_score = analyze(buf, size, TS_FEC_PACKET_SIZE, NULL); | |
547 | av_dlog(NULL, "score: %d, dvhs_score: %d, fec_score: %d \n", | |
548 | score, dvhs_score, fec_score); | |
549 | ||
550 | if (score > fec_score && score > dvhs_score) | |
551 | return TS_PACKET_SIZE; | |
552 | else if (dvhs_score > score && dvhs_score > fec_score) | |
553 | return TS_DVHS_PACKET_SIZE; | |
554 | else if (score < fec_score && dvhs_score < fec_score) | |
555 | return TS_FEC_PACKET_SIZE; | |
556 | else | |
557 | return AVERROR_INVALIDDATA; | |
558 | } | |
559 | ||
560 | typedef struct SectionHeader { | |
561 | uint8_t tid; | |
562 | uint16_t id; | |
563 | uint8_t version; | |
564 | uint8_t sec_num; | |
565 | uint8_t last_sec_num; | |
566 | } SectionHeader; | |
567 | ||
568 | static inline int get8(const uint8_t **pp, const uint8_t *p_end) | |
569 | { | |
570 | const uint8_t *p; | |
571 | int c; | |
572 | ||
573 | p = *pp; | |
574 | if (p >= p_end) | |
575 | return AVERROR_INVALIDDATA; | |
576 | c = *p++; | |
577 | *pp = p; | |
578 | return c; | |
579 | } | |
580 | ||
581 | static inline int get16(const uint8_t **pp, const uint8_t *p_end) | |
582 | { | |
583 | const uint8_t *p; | |
584 | int c; | |
585 | ||
586 | p = *pp; | |
587 | if ((p + 1) >= p_end) | |
588 | return AVERROR_INVALIDDATA; | |
589 | c = AV_RB16(p); | |
590 | p += 2; | |
591 | *pp = p; | |
592 | return c; | |
593 | } | |
594 | ||
595 | /* read and allocate a DVB string preceded by its length */ | |
596 | static char *getstr8(const uint8_t **pp, const uint8_t *p_end) | |
597 | { | |
598 | int len; | |
599 | const uint8_t *p; | |
600 | char *str; | |
601 | ||
602 | p = *pp; | |
603 | len = get8(&p, p_end); | |
604 | if (len < 0) | |
605 | return NULL; | |
606 | if ((p + len) > p_end) | |
607 | return NULL; | |
608 | str = av_malloc(len + 1); | |
609 | if (!str) | |
610 | return NULL; | |
611 | memcpy(str, p, len); | |
612 | str[len] = '\0'; | |
613 | p += len; | |
614 | *pp = p; | |
615 | return str; | |
616 | } | |
617 | ||
618 | static int parse_section_header(SectionHeader *h, | |
619 | const uint8_t **pp, const uint8_t *p_end) | |
620 | { | |
621 | int val; | |
622 | ||
623 | val = get8(pp, p_end); | |
624 | if (val < 0) | |
625 | return val; | |
626 | h->tid = val; | |
627 | *pp += 2; | |
628 | val = get16(pp, p_end); | |
629 | if (val < 0) | |
630 | return val; | |
631 | h->id = val; | |
632 | val = get8(pp, p_end); | |
633 | if (val < 0) | |
634 | return val; | |
635 | h->version = (val >> 1) & 0x1f; | |
636 | val = get8(pp, p_end); | |
637 | if (val < 0) | |
638 | return val; | |
639 | h->sec_num = val; | |
640 | val = get8(pp, p_end); | |
641 | if (val < 0) | |
642 | return val; | |
643 | h->last_sec_num = val; | |
644 | return 0; | |
645 | } | |
646 | ||
647 | typedef struct { | |
648 | uint32_t stream_type; | |
649 | enum AVMediaType codec_type; | |
650 | enum AVCodecID codec_id; | |
651 | } StreamType; | |
652 | ||
653 | static const StreamType ISO_types[] = { | |
654 | { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO }, | |
655 | { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO }, | |
656 | { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 }, | |
657 | { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3 }, | |
658 | { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC }, | |
659 | { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4 }, | |
660 | /* Makito encoder sets stream type 0x11 for AAC, | |
661 | * so auto-detect LOAS/LATM instead of hardcoding it. */ | |
662 | #if !CONFIG_LOAS_DEMUXER | |
663 | { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM }, /* LATM syntax */ | |
664 | #endif | |
665 | { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264 }, | |
666 | { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC }, | |
667 | { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS }, | |
668 | { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC }, | |
669 | { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 }, | |
670 | { 0 }, | |
671 | }; | |
672 | ||
673 | static const StreamType HDMV_types[] = { | |
674 | { 0x80, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_BLURAY }, | |
675 | { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, | |
676 | { 0x82, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, | |
677 | { 0x83, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_TRUEHD }, | |
678 | { 0x84, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, | |
679 | { 0x85, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD */ | |
680 | { 0x86, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS HD MASTER*/ | |
681 | { 0xa1, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC3 Secondary Audio */ | |
682 | { 0xa2, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, /* DTS Express Secondary Audio */ | |
683 | { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE }, | |
684 | { 0 }, | |
685 | }; | |
686 | ||
687 | /* ATSC ? */ | |
688 | static const StreamType MISC_types[] = { | |
689 | { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, | |
690 | { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, | |
691 | { 0 }, | |
692 | }; | |
693 | ||
694 | static const StreamType REGD_types[] = { | |
695 | { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC }, | |
696 | { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, | |
697 | { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M }, | |
698 | { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, | |
699 | { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, | |
700 | { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, | |
701 | { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC }, | |
702 | { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV }, | |
703 | { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1 }, | |
704 | { 0 }, | |
705 | }; | |
706 | ||
707 | static const StreamType METADATA_types[] = { | |
708 | { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV }, | |
709 | { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 }, | |
710 | { 0 }, | |
711 | }; | |
712 | ||
713 | /* descriptor present */ | |
714 | static const StreamType DESC_types[] = { | |
715 | { 0x6a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 }, /* AC-3 descriptor */ | |
716 | { 0x7a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3 }, /* E-AC-3 descriptor */ | |
717 | { 0x7b, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS }, | |
718 | { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT }, | |
719 | { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */ | |
720 | { 0 }, | |
721 | }; | |
722 | ||
723 | static void mpegts_find_stream_type(AVStream *st, | |
724 | uint32_t stream_type, | |
725 | const StreamType *types) | |
726 | { | |
727 | if (avcodec_is_open(st->codec)) { | |
728 | av_log(NULL, AV_LOG_DEBUG, "cannot set stream info, codec is open\n"); | |
729 | return; | |
730 | } | |
731 | ||
732 | for (; types->stream_type; types++) | |
733 | if (stream_type == types->stream_type) { | |
734 | st->codec->codec_type = types->codec_type; | |
735 | st->codec->codec_id = types->codec_id; | |
736 | st->request_probe = 0; | |
737 | return; | |
738 | } | |
739 | } | |
740 | ||
741 | static int mpegts_set_stream_info(AVStream *st, PESContext *pes, | |
742 | uint32_t stream_type, uint32_t prog_reg_desc) | |
743 | { | |
744 | int old_codec_type = st->codec->codec_type; | |
745 | int old_codec_id = st->codec->codec_id; | |
746 | ||
747 | if (avcodec_is_open(st->codec)) { | |
748 | av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, codec is open\n"); | |
749 | return 0; | |
750 | } | |
751 | ||
752 | avpriv_set_pts_info(st, 33, 1, 90000); | |
753 | st->priv_data = pes; | |
754 | st->codec->codec_type = AVMEDIA_TYPE_DATA; | |
755 | st->codec->codec_id = AV_CODEC_ID_NONE; | |
756 | st->need_parsing = AVSTREAM_PARSE_FULL; | |
757 | pes->st = st; | |
758 | pes->stream_type = stream_type; | |
759 | ||
760 | av_log(pes->stream, AV_LOG_DEBUG, | |
761 | "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n", | |
762 | st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc); | |
763 | ||
764 | st->codec->codec_tag = pes->stream_type; | |
765 | ||
766 | mpegts_find_stream_type(st, pes->stream_type, ISO_types); | |
767 | if ((prog_reg_desc == AV_RL32("HDMV") || | |
768 | prog_reg_desc == AV_RL32("HDPR")) && | |
769 | st->codec->codec_id == AV_CODEC_ID_NONE) { | |
770 | mpegts_find_stream_type(st, pes->stream_type, HDMV_types); | |
771 | if (pes->stream_type == 0x83) { | |
772 | // HDMV TrueHD streams also contain an AC3 coded version of the | |
773 | // audio track - add a second stream for this | |
774 | AVStream *sub_st; | |
775 | // priv_data cannot be shared between streams | |
776 | PESContext *sub_pes = av_malloc(sizeof(*sub_pes)); | |
777 | if (!sub_pes) | |
778 | return AVERROR(ENOMEM); | |
779 | memcpy(sub_pes, pes, sizeof(*sub_pes)); | |
780 | ||
781 | sub_st = avformat_new_stream(pes->stream, NULL); | |
782 | if (!sub_st) { | |
783 | av_free(sub_pes); | |
784 | return AVERROR(ENOMEM); | |
785 | } | |
786 | ||
787 | sub_st->id = pes->pid; | |
788 | avpriv_set_pts_info(sub_st, 33, 1, 90000); | |
789 | sub_st->priv_data = sub_pes; | |
790 | sub_st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
791 | sub_st->codec->codec_id = AV_CODEC_ID_AC3; | |
792 | sub_st->need_parsing = AVSTREAM_PARSE_FULL; | |
793 | sub_pes->sub_st = pes->sub_st = sub_st; | |
794 | } | |
795 | } | |
796 | if (st->codec->codec_id == AV_CODEC_ID_NONE) | |
797 | mpegts_find_stream_type(st, pes->stream_type, MISC_types); | |
798 | if (st->codec->codec_id == AV_CODEC_ID_NONE) { | |
799 | st->codec->codec_id = old_codec_id; | |
800 | st->codec->codec_type = old_codec_type; | |
801 | } | |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
806 | static void reset_pes_packet_state(PESContext *pes) | |
807 | { | |
808 | pes->pts = AV_NOPTS_VALUE; | |
809 | pes->dts = AV_NOPTS_VALUE; | |
810 | pes->data_index = 0; | |
811 | pes->flags = 0; | |
812 | av_buffer_unref(&pes->buffer); | |
813 | } | |
814 | ||
815 | static void new_pes_packet(PESContext *pes, AVPacket *pkt) | |
816 | { | |
817 | av_init_packet(pkt); | |
818 | ||
819 | pkt->buf = pes->buffer; | |
820 | pkt->data = pes->buffer->data; | |
821 | pkt->size = pes->data_index; | |
822 | ||
823 | if (pes->total_size != MAX_PES_PAYLOAD && | |
824 | pes->pes_header_size + pes->data_index != pes->total_size + | |
825 | PES_START_SIZE) { | |
826 | av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n"); | |
827 | pes->flags |= AV_PKT_FLAG_CORRUPT; | |
828 | } | |
829 | memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE); | |
830 | ||
831 | // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID | |
832 | if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76) | |
833 | pkt->stream_index = pes->sub_st->index; | |
834 | else | |
835 | pkt->stream_index = pes->st->index; | |
836 | pkt->pts = pes->pts; | |
837 | pkt->dts = pes->dts; | |
838 | /* store position of first TS packet of this PES packet */ | |
839 | pkt->pos = pes->ts_packet_pos; | |
840 | pkt->flags = pes->flags; | |
841 | ||
842 | pes->buffer = NULL; | |
843 | reset_pes_packet_state(pes); | |
844 | } | |
845 | ||
846 | static uint64_t get_ts64(GetBitContext *gb, int bits) | |
847 | { | |
848 | if (get_bits_left(gb) < bits) | |
849 | return AV_NOPTS_VALUE; | |
850 | return get_bits64(gb, bits); | |
851 | } | |
852 | ||
853 | static int read_sl_header(PESContext *pes, SLConfigDescr *sl, | |
854 | const uint8_t *buf, int buf_size) | |
855 | { | |
856 | GetBitContext gb; | |
857 | int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0; | |
858 | int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0; | |
859 | int dts_flag = -1, cts_flag = -1; | |
860 | int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE; | |
861 | uint8_t buf_padded[128 + FF_INPUT_BUFFER_PADDING_SIZE]; | |
862 | int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - FF_INPUT_BUFFER_PADDING_SIZE); | |
863 | ||
864 | memcpy(buf_padded, buf, buf_padded_size); | |
865 | ||
866 | init_get_bits(&gb, buf_padded, buf_padded_size * 8); | |
867 | ||
868 | if (sl->use_au_start) | |
869 | au_start_flag = get_bits1(&gb); | |
870 | if (sl->use_au_end) | |
871 | au_end_flag = get_bits1(&gb); | |
872 | if (!sl->use_au_start && !sl->use_au_end) | |
873 | au_start_flag = au_end_flag = 1; | |
874 | if (sl->ocr_len > 0) | |
875 | ocr_flag = get_bits1(&gb); | |
876 | if (sl->use_idle) | |
877 | idle_flag = get_bits1(&gb); | |
878 | if (sl->use_padding) | |
879 | padding_flag = get_bits1(&gb); | |
880 | if (padding_flag) | |
881 | padding_bits = get_bits(&gb, 3); | |
882 | ||
883 | if (!idle_flag && (!padding_flag || padding_bits != 0)) { | |
884 | if (sl->packet_seq_num_len) | |
885 | skip_bits_long(&gb, sl->packet_seq_num_len); | |
886 | if (sl->degr_prior_len) | |
887 | if (get_bits1(&gb)) | |
888 | skip_bits(&gb, sl->degr_prior_len); | |
889 | if (ocr_flag) | |
890 | skip_bits_long(&gb, sl->ocr_len); | |
891 | if (au_start_flag) { | |
892 | if (sl->use_rand_acc_pt) | |
893 | get_bits1(&gb); | |
894 | if (sl->au_seq_num_len > 0) | |
895 | skip_bits_long(&gb, sl->au_seq_num_len); | |
896 | if (sl->use_timestamps) { | |
897 | dts_flag = get_bits1(&gb); | |
898 | cts_flag = get_bits1(&gb); | |
899 | } | |
900 | } | |
901 | if (sl->inst_bitrate_len) | |
902 | inst_bitrate_flag = get_bits1(&gb); | |
903 | if (dts_flag == 1) | |
904 | dts = get_ts64(&gb, sl->timestamp_len); | |
905 | if (cts_flag == 1) | |
906 | cts = get_ts64(&gb, sl->timestamp_len); | |
907 | if (sl->au_len > 0) | |
908 | skip_bits_long(&gb, sl->au_len); | |
909 | if (inst_bitrate_flag) | |
910 | skip_bits_long(&gb, sl->inst_bitrate_len); | |
911 | } | |
912 | ||
913 | if (dts != AV_NOPTS_VALUE) | |
914 | pes->dts = dts; | |
915 | if (cts != AV_NOPTS_VALUE) | |
916 | pes->pts = cts; | |
917 | ||
918 | if (sl->timestamp_len && sl->timestamp_res) | |
919 | avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res); | |
920 | ||
921 | return (get_bits_count(&gb) + 7) >> 3; | |
922 | } | |
923 | ||
924 | /* return non zero if a packet could be constructed */ | |
925 | static int mpegts_push_data(MpegTSFilter *filter, | |
926 | const uint8_t *buf, int buf_size, int is_start, | |
927 | int64_t pos) | |
928 | { | |
929 | PESContext *pes = filter->u.pes_filter.opaque; | |
930 | MpegTSContext *ts = pes->ts; | |
931 | const uint8_t *p; | |
932 | int len, code; | |
933 | ||
934 | if (!ts->pkt) | |
935 | return 0; | |
936 | ||
937 | if (is_start) { | |
938 | if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) { | |
939 | new_pes_packet(pes, ts->pkt); | |
940 | ts->stop_parse = 1; | |
941 | } else { | |
942 | reset_pes_packet_state(pes); | |
943 | } | |
944 | pes->state = MPEGTS_HEADER; | |
945 | pes->ts_packet_pos = pos; | |
946 | } | |
947 | p = buf; | |
948 | while (buf_size > 0) { | |
949 | switch (pes->state) { | |
950 | case MPEGTS_HEADER: | |
951 | len = PES_START_SIZE - pes->data_index; | |
952 | if (len > buf_size) | |
953 | len = buf_size; | |
954 | memcpy(pes->header + pes->data_index, p, len); | |
955 | pes->data_index += len; | |
956 | p += len; | |
957 | buf_size -= len; | |
958 | if (pes->data_index == PES_START_SIZE) { | |
959 | /* we got all the PES or section header. We can now | |
960 | * decide */ | |
961 | if (pes->header[0] == 0x00 && pes->header[1] == 0x00 && | |
962 | pes->header[2] == 0x01) { | |
963 | /* it must be an mpeg2 PES stream */ | |
964 | code = pes->header[3] | 0x100; | |
965 | av_dlog(pes->stream, "pid=%x pes_code=%#x\n", pes->pid, | |
966 | code); | |
967 | ||
968 | if ((pes->st && pes->st->discard == AVDISCARD_ALL && | |
969 | (!pes->sub_st || | |
970 | pes->sub_st->discard == AVDISCARD_ALL)) || | |
971 | code == 0x1be) /* padding_stream */ | |
972 | goto skip; | |
973 | ||
974 | /* stream not present in PMT */ | |
975 | if (!pes->st) { | |
976 | if (ts->skip_changes) | |
977 | goto skip; | |
978 | ||
979 | pes->st = avformat_new_stream(ts->stream, NULL); | |
980 | if (!pes->st) | |
981 | return AVERROR(ENOMEM); | |
982 | pes->st->id = pes->pid; | |
983 | mpegts_set_stream_info(pes->st, pes, 0, 0); | |
984 | } | |
985 | ||
986 | pes->total_size = AV_RB16(pes->header + 4); | |
987 | /* NOTE: a zero total size means the PES size is | |
988 | * unbounded */ | |
989 | if (!pes->total_size) | |
990 | pes->total_size = MAX_PES_PAYLOAD; | |
991 | ||
992 | /* allocate pes buffer */ | |
993 | pes->buffer = av_buffer_alloc(pes->total_size + | |
994 | FF_INPUT_BUFFER_PADDING_SIZE); | |
995 | if (!pes->buffer) | |
996 | return AVERROR(ENOMEM); | |
997 | ||
998 | if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */ | |
999 | code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */ | |
1000 | code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */ | |
1001 | code != 0x1f8) { /* ITU-T Rec. H.222.1 type E stream */ | |
1002 | pes->state = MPEGTS_PESHEADER; | |
1003 | if (pes->st->codec->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) { | |
1004 | av_dlog(pes->stream, | |
1005 | "pid=%x stream_type=%x probing\n", | |
1006 | pes->pid, | |
1007 | pes->stream_type); | |
1008 | pes->st->request_probe = 1; | |
1009 | } | |
1010 | } else { | |
1011 | pes->state = MPEGTS_PAYLOAD; | |
1012 | pes->data_index = 0; | |
1013 | } | |
1014 | } else { | |
1015 | /* otherwise, it should be a table */ | |
1016 | /* skip packet */ | |
1017 | skip: | |
1018 | pes->state = MPEGTS_SKIP; | |
1019 | continue; | |
1020 | } | |
1021 | } | |
1022 | break; | |
1023 | /**********************************************/ | |
1024 | /* PES packing parsing */ | |
1025 | case MPEGTS_PESHEADER: | |
1026 | len = PES_HEADER_SIZE - pes->data_index; | |
1027 | if (len < 0) | |
1028 | return AVERROR_INVALIDDATA; | |
1029 | if (len > buf_size) | |
1030 | len = buf_size; | |
1031 | memcpy(pes->header + pes->data_index, p, len); | |
1032 | pes->data_index += len; | |
1033 | p += len; | |
1034 | buf_size -= len; | |
1035 | if (pes->data_index == PES_HEADER_SIZE) { | |
1036 | pes->pes_header_size = pes->header[8] + 9; | |
1037 | pes->state = MPEGTS_PESHEADER_FILL; | |
1038 | } | |
1039 | break; | |
1040 | case MPEGTS_PESHEADER_FILL: | |
1041 | len = pes->pes_header_size - pes->data_index; | |
1042 | if (len < 0) | |
1043 | return AVERROR_INVALIDDATA; | |
1044 | if (len > buf_size) | |
1045 | len = buf_size; | |
1046 | memcpy(pes->header + pes->data_index, p, len); | |
1047 | pes->data_index += len; | |
1048 | p += len; | |
1049 | buf_size -= len; | |
1050 | if (pes->data_index == pes->pes_header_size) { | |
1051 | const uint8_t *r; | |
1052 | unsigned int flags, pes_ext, skip; | |
1053 | ||
1054 | flags = pes->header[7]; | |
1055 | r = pes->header + 9; | |
1056 | pes->pts = AV_NOPTS_VALUE; | |
1057 | pes->dts = AV_NOPTS_VALUE; | |
1058 | if ((flags & 0xc0) == 0x80) { | |
1059 | pes->dts = pes->pts = ff_parse_pes_pts(r); | |
1060 | r += 5; | |
1061 | } else if ((flags & 0xc0) == 0xc0) { | |
1062 | pes->pts = ff_parse_pes_pts(r); | |
1063 | r += 5; | |
1064 | pes->dts = ff_parse_pes_pts(r); | |
1065 | r += 5; | |
1066 | } | |
1067 | pes->extended_stream_id = -1; | |
1068 | if (flags & 0x01) { /* PES extension */ | |
1069 | pes_ext = *r++; | |
1070 | /* Skip PES private data, program packet sequence counter and P-STD buffer */ | |
1071 | skip = (pes_ext >> 4) & 0xb; | |
1072 | skip += skip & 0x9; | |
1073 | r += skip; | |
1074 | if ((pes_ext & 0x41) == 0x01 && | |
1075 | (r + 2) <= (pes->header + pes->pes_header_size)) { | |
1076 | /* PES extension 2 */ | |
1077 | if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0) | |
1078 | pes->extended_stream_id = r[1]; | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | /* we got the full header. We parse it and get the payload */ | |
1083 | pes->state = MPEGTS_PAYLOAD; | |
1084 | pes->data_index = 0; | |
1085 | if (pes->stream_type == 0x12 && buf_size > 0) { | |
1086 | int sl_header_bytes = read_sl_header(pes, &pes->sl, p, | |
1087 | buf_size); | |
1088 | pes->pes_header_size += sl_header_bytes; | |
1089 | p += sl_header_bytes; | |
1090 | buf_size -= sl_header_bytes; | |
1091 | } | |
1092 | if (pes->stream_type == 0x15 && buf_size >= 5) { | |
1093 | /* skip metadata access unit header */ | |
1094 | pes->pes_header_size += 5; | |
1095 | p += 5; | |
1096 | buf_size -= 5; | |
1097 | } | |
1098 | if (pes->ts->fix_teletext_pts && pes->st->codec->codec_id == AV_CODEC_ID_DVB_TELETEXT) { | |
1099 | AVProgram *p = NULL; | |
1100 | while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) { | |
1101 | if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) { | |
1102 | MpegTSFilter *f = pes->ts->pids[p->pcr_pid]; | |
1103 | if (f) { | |
1104 | AVStream *st = NULL; | |
1105 | if (f->type == MPEGTS_PES) { | |
1106 | PESContext *pcrpes = f->u.pes_filter.opaque; | |
1107 | if (pcrpes) | |
1108 | st = pcrpes->st; | |
1109 | } else if (f->type == MPEGTS_PCR) { | |
1110 | int i; | |
1111 | for (i = 0; i < p->nb_stream_indexes; i++) { | |
1112 | AVStream *pst = pes->stream->streams[p->stream_index[i]]; | |
1113 | if (pst->codec->codec_type == AVMEDIA_TYPE_VIDEO) | |
1114 | st = pst; | |
1115 | } | |
1116 | } | |
1117 | if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) { | |
1118 | // teletext packets do not always have correct timestamps, | |
1119 | // the standard says they should be handled after 40.6 ms at most, | |
1120 | // and the pcr error to this packet should be no more than 100 ms. | |
1121 | // TODO: we should interpolate the PCR, not just use the last one | |
1122 | int64_t pcr = f->last_pcr / 300; | |
1123 | pes->st->pts_wrap_reference = st->pts_wrap_reference; | |
1124 | pes->st->pts_wrap_behavior = st->pts_wrap_behavior; | |
1125 | if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) { | |
1126 | pes->pts = pes->dts = pcr; | |
1127 | } else if (pes->dts > pcr + 3654 + 9000) { | |
1128 | pes->pts = pes->dts = pcr + 3654 + 9000; | |
1129 | } | |
1130 | break; | |
1131 | } | |
1132 | } | |
1133 | } | |
1134 | } | |
1135 | } | |
1136 | } | |
1137 | break; | |
1138 | case MPEGTS_PAYLOAD: | |
1139 | if (pes->buffer) { | |
1140 | if (pes->data_index > 0 && | |
1141 | pes->data_index + buf_size > pes->total_size) { | |
1142 | new_pes_packet(pes, ts->pkt); | |
1143 | pes->total_size = MAX_PES_PAYLOAD; | |
1144 | pes->buffer = av_buffer_alloc(pes->total_size + | |
1145 | FF_INPUT_BUFFER_PADDING_SIZE); | |
1146 | if (!pes->buffer) | |
1147 | return AVERROR(ENOMEM); | |
1148 | ts->stop_parse = 1; | |
1149 | } else if (pes->data_index == 0 && | |
1150 | buf_size > pes->total_size) { | |
1151 | // pes packet size is < ts size packet and pes data is padded with 0xff | |
1152 | // not sure if this is legal in ts but see issue #2392 | |
1153 | buf_size = pes->total_size; | |
1154 | } | |
1155 | memcpy(pes->buffer->data + pes->data_index, p, buf_size); | |
1156 | pes->data_index += buf_size; | |
1157 | /* emit complete packets with known packet size | |
1158 | * decreases demuxer delay for infrequent packets like subtitles from | |
1159 | * a couple of seconds to milliseconds for properly muxed files. | |
1160 | * total_size is the number of bytes following pes_packet_length | |
1161 | * in the pes header, i.e. not counting the first PES_START_SIZE bytes */ | |
1162 | if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD && | |
1163 | pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) { | |
1164 | ts->stop_parse = 1; | |
1165 | new_pes_packet(pes, ts->pkt); | |
1166 | } | |
1167 | } | |
1168 | buf_size = 0; | |
1169 | break; | |
1170 | case MPEGTS_SKIP: | |
1171 | buf_size = 0; | |
1172 | break; | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid) | |
1180 | { | |
1181 | MpegTSFilter *tss; | |
1182 | PESContext *pes; | |
1183 | ||
1184 | /* if no pid found, then add a pid context */ | |
1185 | pes = av_mallocz(sizeof(PESContext)); | |
1186 | if (!pes) | |
1187 | return 0; | |
1188 | pes->ts = ts; | |
1189 | pes->stream = ts->stream; | |
1190 | pes->pid = pid; | |
1191 | pes->pcr_pid = pcr_pid; | |
1192 | pes->state = MPEGTS_SKIP; | |
1193 | pes->pts = AV_NOPTS_VALUE; | |
1194 | pes->dts = AV_NOPTS_VALUE; | |
1195 | tss = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes); | |
1196 | if (!tss) { | |
1197 | av_free(pes); | |
1198 | return 0; | |
1199 | } | |
1200 | return pes; | |
1201 | } | |
1202 | ||
1203 | #define MAX_LEVEL 4 | |
1204 | typedef struct { | |
1205 | AVFormatContext *s; | |
1206 | AVIOContext pb; | |
1207 | Mp4Descr *descr; | |
1208 | Mp4Descr *active_descr; | |
1209 | int descr_count; | |
1210 | int max_descr_count; | |
1211 | int level; | |
1212 | int predefined_SLConfigDescriptor_seen; | |
1213 | } MP4DescrParseContext; | |
1214 | ||
1215 | static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s, | |
1216 | const uint8_t *buf, unsigned size, | |
1217 | Mp4Descr *descr, int max_descr_count) | |
1218 | { | |
1219 | int ret; | |
1220 | if (size > (1 << 30)) | |
1221 | return AVERROR_INVALIDDATA; | |
1222 | ||
1223 | if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0, | |
1224 | NULL, NULL, NULL, NULL)) < 0) | |
1225 | return ret; | |
1226 | ||
1227 | d->s = s; | |
1228 | d->level = 0; | |
1229 | d->descr_count = 0; | |
1230 | d->descr = descr; | |
1231 | d->active_descr = NULL; | |
1232 | d->max_descr_count = max_descr_count; | |
1233 | ||
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | static void update_offsets(AVIOContext *pb, int64_t *off, int *len) | |
1238 | { | |
1239 | int64_t new_off = avio_tell(pb); | |
1240 | (*len) -= new_off - *off; | |
1241 | *off = new_off; | |
1242 | } | |
1243 | ||
1244 | static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len, | |
1245 | int target_tag); | |
1246 | ||
1247 | static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len) | |
1248 | { | |
1249 | while (len > 0) { | |
1250 | int ret = parse_mp4_descr(d, off, len, 0); | |
1251 | if (ret < 0) | |
1252 | return ret; | |
1253 | update_offsets(&d->pb, &off, &len); | |
1254 | } | |
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len) | |
1259 | { | |
1260 | avio_rb16(&d->pb); // ID | |
1261 | avio_r8(&d->pb); | |
1262 | avio_r8(&d->pb); | |
1263 | avio_r8(&d->pb); | |
1264 | avio_r8(&d->pb); | |
1265 | avio_r8(&d->pb); | |
1266 | update_offsets(&d->pb, &off, &len); | |
1267 | return parse_mp4_descr_arr(d, off, len); | |
1268 | } | |
1269 | ||
1270 | static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len) | |
1271 | { | |
1272 | int id_flags; | |
1273 | if (len < 2) | |
1274 | return 0; | |
1275 | id_flags = avio_rb16(&d->pb); | |
1276 | if (!(id_flags & 0x0020)) { // URL_Flag | |
1277 | update_offsets(&d->pb, &off, &len); | |
1278 | return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[] | |
1279 | } else { | |
1280 | return 0; | |
1281 | } | |
1282 | } | |
1283 | ||
1284 | static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len) | |
1285 | { | |
1286 | int es_id = 0; | |
1287 | if (d->descr_count >= d->max_descr_count) | |
1288 | return AVERROR_INVALIDDATA; | |
1289 | ff_mp4_parse_es_descr(&d->pb, &es_id); | |
1290 | d->active_descr = d->descr + (d->descr_count++); | |
1291 | ||
1292 | d->active_descr->es_id = es_id; | |
1293 | update_offsets(&d->pb, &off, &len); | |
1294 | parse_mp4_descr(d, off, len, MP4DecConfigDescrTag); | |
1295 | update_offsets(&d->pb, &off, &len); | |
1296 | if (len > 0) | |
1297 | parse_mp4_descr(d, off, len, MP4SLDescrTag); | |
1298 | d->active_descr = NULL; | |
1299 | return 0; | |
1300 | } | |
1301 | ||
1302 | static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off, | |
1303 | int len) | |
1304 | { | |
1305 | Mp4Descr *descr = d->active_descr; | |
1306 | if (!descr) | |
1307 | return AVERROR_INVALIDDATA; | |
1308 | d->active_descr->dec_config_descr = av_malloc(len); | |
1309 | if (!descr->dec_config_descr) | |
1310 | return AVERROR(ENOMEM); | |
1311 | descr->dec_config_descr_len = len; | |
1312 | avio_read(&d->pb, descr->dec_config_descr, len); | |
1313 | return 0; | |
1314 | } | |
1315 | ||
1316 | static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len) | |
1317 | { | |
1318 | Mp4Descr *descr = d->active_descr; | |
1319 | int predefined; | |
1320 | if (!descr) | |
1321 | return AVERROR_INVALIDDATA; | |
1322 | ||
1323 | predefined = avio_r8(&d->pb); | |
1324 | if (!predefined) { | |
1325 | int lengths; | |
1326 | int flags = avio_r8(&d->pb); | |
1327 | descr->sl.use_au_start = !!(flags & 0x80); | |
1328 | descr->sl.use_au_end = !!(flags & 0x40); | |
1329 | descr->sl.use_rand_acc_pt = !!(flags & 0x20); | |
1330 | descr->sl.use_padding = !!(flags & 0x08); | |
1331 | descr->sl.use_timestamps = !!(flags & 0x04); | |
1332 | descr->sl.use_idle = !!(flags & 0x02); | |
1333 | descr->sl.timestamp_res = avio_rb32(&d->pb); | |
1334 | avio_rb32(&d->pb); | |
1335 | descr->sl.timestamp_len = avio_r8(&d->pb); | |
1336 | if (descr->sl.timestamp_len > 64) { | |
1337 | avpriv_request_sample(NULL, "timestamp_len > 64"); | |
1338 | descr->sl.timestamp_len = 64; | |
1339 | return AVERROR_PATCHWELCOME; | |
1340 | } | |
1341 | descr->sl.ocr_len = avio_r8(&d->pb); | |
1342 | descr->sl.au_len = avio_r8(&d->pb); | |
1343 | descr->sl.inst_bitrate_len = avio_r8(&d->pb); | |
1344 | lengths = avio_rb16(&d->pb); | |
1345 | descr->sl.degr_prior_len = lengths >> 12; | |
1346 | descr->sl.au_seq_num_len = (lengths >> 7) & 0x1f; | |
1347 | descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f; | |
1348 | } else if (!d->predefined_SLConfigDescriptor_seen){ | |
1349 | avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor"); | |
1350 | d->predefined_SLConfigDescriptor_seen = 1; | |
1351 | } | |
1352 | return 0; | |
1353 | } | |
1354 | ||
1355 | static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len, | |
1356 | int target_tag) | |
1357 | { | |
1358 | int tag; | |
1359 | int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag); | |
1360 | update_offsets(&d->pb, &off, &len); | |
1361 | if (len < 0 || len1 > len || len1 <= 0) { | |
1362 | av_log(d->s, AV_LOG_ERROR, | |
1363 | "Tag %x length violation new length %d bytes remaining %d\n", | |
1364 | tag, len1, len); | |
1365 | return AVERROR_INVALIDDATA; | |
1366 | } | |
1367 | ||
1368 | if (d->level++ >= MAX_LEVEL) { | |
1369 | av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n"); | |
1370 | goto done; | |
1371 | } | |
1372 | ||
1373 | if (target_tag && tag != target_tag) { | |
1374 | av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag, | |
1375 | target_tag); | |
1376 | goto done; | |
1377 | } | |
1378 | ||
1379 | switch (tag) { | |
1380 | case MP4IODescrTag: | |
1381 | parse_MP4IODescrTag(d, off, len1); | |
1382 | break; | |
1383 | case MP4ODescrTag: | |
1384 | parse_MP4ODescrTag(d, off, len1); | |
1385 | break; | |
1386 | case MP4ESDescrTag: | |
1387 | parse_MP4ESDescrTag(d, off, len1); | |
1388 | break; | |
1389 | case MP4DecConfigDescrTag: | |
1390 | parse_MP4DecConfigDescrTag(d, off, len1); | |
1391 | break; | |
1392 | case MP4SLDescrTag: | |
1393 | parse_MP4SLDescrTag(d, off, len1); | |
1394 | break; | |
1395 | } | |
1396 | ||
1397 | ||
1398 | done: | |
1399 | d->level--; | |
1400 | avio_seek(&d->pb, off + len1, SEEK_SET); | |
1401 | return 0; | |
1402 | } | |
1403 | ||
1404 | static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size, | |
1405 | Mp4Descr *descr, int *descr_count, int max_descr_count) | |
1406 | { | |
1407 | MP4DescrParseContext d; | |
1408 | int ret; | |
1409 | ||
1410 | ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count); | |
1411 | if (ret < 0) | |
1412 | return ret; | |
1413 | ||
1414 | ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag); | |
1415 | ||
1416 | *descr_count = d.descr_count; | |
1417 | return ret; | |
1418 | } | |
1419 | ||
1420 | static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size, | |
1421 | Mp4Descr *descr, int *descr_count, int max_descr_count) | |
1422 | { | |
1423 | MP4DescrParseContext d; | |
1424 | int ret; | |
1425 | ||
1426 | ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count); | |
1427 | if (ret < 0) | |
1428 | return ret; | |
1429 | ||
1430 | ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size); | |
1431 | ||
1432 | *descr_count = d.descr_count; | |
1433 | return ret; | |
1434 | } | |
1435 | ||
1436 | static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section, | |
1437 | int section_len) | |
1438 | { | |
1439 | MpegTSContext *ts = filter->u.section_filter.opaque; | |
1440 | SectionHeader h; | |
1441 | const uint8_t *p, *p_end; | |
1442 | AVIOContext pb; | |
1443 | int mp4_descr_count = 0; | |
1444 | Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } }; | |
1445 | int i, pid; | |
1446 | AVFormatContext *s = ts->stream; | |
1447 | ||
1448 | p_end = section + section_len - 4; | |
1449 | p = section; | |
1450 | if (parse_section_header(&h, &p, p_end) < 0) | |
1451 | return; | |
1452 | if (h.tid != M4OD_TID) | |
1453 | return; | |
1454 | ||
1455 | mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count, | |
1456 | MAX_MP4_DESCR_COUNT); | |
1457 | ||
1458 | for (pid = 0; pid < NB_PID_MAX; pid++) { | |
1459 | if (!ts->pids[pid]) | |
1460 | continue; | |
1461 | for (i = 0; i < mp4_descr_count; i++) { | |
1462 | PESContext *pes; | |
1463 | AVStream *st; | |
1464 | if (ts->pids[pid]->es_id != mp4_descr[i].es_id) | |
1465 | continue; | |
1466 | if (ts->pids[pid]->type != MPEGTS_PES) { | |
1467 | av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid); | |
1468 | continue; | |
1469 | } | |
1470 | pes = ts->pids[pid]->u.pes_filter.opaque; | |
1471 | st = pes->st; | |
1472 | if (!st) | |
1473 | continue; | |
1474 | ||
1475 | pes->sl = mp4_descr[i].sl; | |
1476 | ||
1477 | ffio_init_context(&pb, mp4_descr[i].dec_config_descr, | |
1478 | mp4_descr[i].dec_config_descr_len, 0, | |
1479 | NULL, NULL, NULL, NULL); | |
1480 | ff_mp4_read_dec_config_descr(s, st, &pb); | |
1481 | if (st->codec->codec_id == AV_CODEC_ID_AAC && | |
1482 | st->codec->extradata_size > 0) | |
1483 | st->need_parsing = 0; | |
1484 | if (st->codec->codec_id == AV_CODEC_ID_H264 && | |
1485 | st->codec->extradata_size > 0) | |
1486 | st->need_parsing = 0; | |
1487 | ||
1488 | if (st->codec->codec_id <= AV_CODEC_ID_NONE) { | |
1489 | // do nothing | |
1490 | } else if (st->codec->codec_id < AV_CODEC_ID_FIRST_AUDIO) | |
1491 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
1492 | else if (st->codec->codec_id < AV_CODEC_ID_FIRST_SUBTITLE) | |
1493 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
1494 | else if (st->codec->codec_id < AV_CODEC_ID_FIRST_UNKNOWN) | |
1495 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
1496 | } | |
1497 | } | |
1498 | for (i = 0; i < mp4_descr_count; i++) | |
1499 | av_free(mp4_descr[i].dec_config_descr); | |
1500 | } | |
1501 | ||
1502 | int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type, | |
1503 | const uint8_t **pp, const uint8_t *desc_list_end, | |
1504 | Mp4Descr *mp4_descr, int mp4_descr_count, int pid, | |
1505 | MpegTSContext *ts) | |
1506 | { | |
1507 | const uint8_t *desc_end; | |
1508 | int desc_len, desc_tag, desc_es_id; | |
1509 | char language[252]; | |
1510 | int i; | |
1511 | ||
1512 | desc_tag = get8(pp, desc_list_end); | |
1513 | if (desc_tag < 0) | |
1514 | return AVERROR_INVALIDDATA; | |
1515 | desc_len = get8(pp, desc_list_end); | |
1516 | if (desc_len < 0) | |
1517 | return AVERROR_INVALIDDATA; | |
1518 | desc_end = *pp + desc_len; | |
1519 | if (desc_end > desc_list_end) | |
1520 | return AVERROR_INVALIDDATA; | |
1521 | ||
1522 | av_dlog(fc, "tag: 0x%02x len=%d\n", desc_tag, desc_len); | |
1523 | ||
1524 | if ((st->codec->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) && | |
1525 | stream_type == STREAM_TYPE_PRIVATE_DATA) | |
1526 | mpegts_find_stream_type(st, desc_tag, DESC_types); | |
1527 | ||
1528 | switch (desc_tag) { | |
1529 | case 0x1E: /* SL descriptor */ | |
1530 | desc_es_id = get16(pp, desc_end); | |
1531 | if (ts && ts->pids[pid]) | |
1532 | ts->pids[pid]->es_id = desc_es_id; | |
1533 | for (i = 0; i < mp4_descr_count; i++) | |
1534 | if (mp4_descr[i].dec_config_descr_len && | |
1535 | mp4_descr[i].es_id == desc_es_id) { | |
1536 | AVIOContext pb; | |
1537 | ffio_init_context(&pb, mp4_descr[i].dec_config_descr, | |
1538 | mp4_descr[i].dec_config_descr_len, 0, | |
1539 | NULL, NULL, NULL, NULL); | |
1540 | ff_mp4_read_dec_config_descr(fc, st, &pb); | |
1541 | if (st->codec->codec_id == AV_CODEC_ID_AAC && | |
1542 | st->codec->extradata_size > 0) | |
1543 | st->need_parsing = 0; | |
1544 | if (st->codec->codec_id == AV_CODEC_ID_MPEG4SYSTEMS) | |
1545 | mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1); | |
1546 | } | |
1547 | break; | |
1548 | case 0x1F: /* FMC descriptor */ | |
1549 | get16(pp, desc_end); | |
1550 | if (mp4_descr_count > 0 && | |
1551 | (st->codec->codec_id == AV_CODEC_ID_AAC_LATM || st->request_probe > 0) && | |
1552 | mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) { | |
1553 | AVIOContext pb; | |
1554 | ffio_init_context(&pb, mp4_descr->dec_config_descr, | |
1555 | mp4_descr->dec_config_descr_len, 0, | |
1556 | NULL, NULL, NULL, NULL); | |
1557 | ff_mp4_read_dec_config_descr(fc, st, &pb); | |
1558 | if (st->codec->codec_id == AV_CODEC_ID_AAC && | |
1559 | st->codec->extradata_size > 0) { | |
1560 | st->request_probe = st->need_parsing = 0; | |
1561 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
1562 | } | |
1563 | } | |
1564 | break; | |
1565 | case 0x56: /* DVB teletext descriptor */ | |
1566 | { | |
1567 | uint8_t *extradata = NULL; | |
1568 | int language_count = desc_len / 5; | |
1569 | ||
1570 | if (desc_len > 0 && desc_len % 5 != 0) | |
1571 | return AVERROR_INVALIDDATA; | |
1572 | ||
1573 | if (language_count > 0) { | |
1574 | /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */ | |
1575 | if (language_count > sizeof(language) / 4) { | |
1576 | language_count = sizeof(language) / 4; | |
1577 | } | |
1578 | ||
1579 | if (st->codec->extradata == NULL) { | |
1580 | if (ff_alloc_extradata(st->codec, language_count * 2)) { | |
1581 | return AVERROR(ENOMEM); | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | if (st->codec->extradata_size < language_count * 2) | |
1586 | return AVERROR_INVALIDDATA; | |
1587 | ||
1588 | extradata = st->codec->extradata; | |
1589 | ||
1590 | for (i = 0; i < language_count; i++) { | |
1591 | language[i * 4 + 0] = get8(pp, desc_end); | |
1592 | language[i * 4 + 1] = get8(pp, desc_end); | |
1593 | language[i * 4 + 2] = get8(pp, desc_end); | |
1594 | language[i * 4 + 3] = ','; | |
1595 | ||
1596 | memcpy(extradata, *pp, 2); | |
1597 | extradata += 2; | |
1598 | ||
1599 | *pp += 2; | |
1600 | } | |
1601 | ||
1602 | language[i * 4 - 1] = 0; | |
1603 | av_dict_set(&st->metadata, "language", language, 0); | |
1604 | } | |
1605 | } | |
1606 | break; | |
1607 | case 0x59: /* subtitling descriptor */ | |
1608 | { | |
1609 | /* 8 bytes per DVB subtitle substream data: | |
1610 | * ISO_639_language_code (3 bytes), | |
1611 | * subtitling_type (1 byte), | |
1612 | * composition_page_id (2 bytes), | |
1613 | * ancillary_page_id (2 bytes) */ | |
1614 | int language_count = desc_len / 8; | |
1615 | ||
1616 | if (desc_len > 0 && desc_len % 8 != 0) | |
1617 | return AVERROR_INVALIDDATA; | |
1618 | ||
1619 | if (language_count > 1) { | |
1620 | avpriv_request_sample(fc, "DVB subtitles with multiple languages"); | |
1621 | } | |
1622 | ||
1623 | if (language_count > 0) { | |
1624 | uint8_t *extradata; | |
1625 | ||
1626 | /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */ | |
1627 | if (language_count > sizeof(language) / 4) { | |
1628 | language_count = sizeof(language) / 4; | |
1629 | } | |
1630 | ||
1631 | if (st->codec->extradata == NULL) { | |
1632 | if (ff_alloc_extradata(st->codec, language_count * 5)) { | |
1633 | return AVERROR(ENOMEM); | |
1634 | } | |
1635 | } | |
1636 | ||
1637 | if (st->codec->extradata_size < language_count * 5) | |
1638 | return AVERROR_INVALIDDATA; | |
1639 | ||
1640 | extradata = st->codec->extradata; | |
1641 | ||
1642 | for (i = 0; i < language_count; i++) { | |
1643 | language[i * 4 + 0] = get8(pp, desc_end); | |
1644 | language[i * 4 + 1] = get8(pp, desc_end); | |
1645 | language[i * 4 + 2] = get8(pp, desc_end); | |
1646 | language[i * 4 + 3] = ','; | |
1647 | ||
1648 | /* hearing impaired subtitles detection using subtitling_type */ | |
1649 | switch (*pp[0]) { | |
1650 | case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */ | |
1651 | case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */ | |
1652 | case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */ | |
1653 | case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */ | |
1654 | case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */ | |
1655 | case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */ | |
1656 | st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; | |
1657 | break; | |
1658 | } | |
1659 | ||
1660 | extradata[4] = get8(pp, desc_end); /* subtitling_type */ | |
1661 | memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */ | |
1662 | extradata += 5; | |
1663 | ||
1664 | *pp += 4; | |
1665 | } | |
1666 | ||
1667 | language[i * 4 - 1] = 0; | |
1668 | av_dict_set(&st->metadata, "language", language, 0); | |
1669 | } | |
1670 | } | |
1671 | break; | |
1672 | case 0x0a: /* ISO 639 language descriptor */ | |
1673 | for (i = 0; i + 4 <= desc_len; i += 4) { | |
1674 | language[i + 0] = get8(pp, desc_end); | |
1675 | language[i + 1] = get8(pp, desc_end); | |
1676 | language[i + 2] = get8(pp, desc_end); | |
1677 | language[i + 3] = ','; | |
1678 | switch (get8(pp, desc_end)) { | |
1679 | case 0x01: | |
1680 | st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS; | |
1681 | break; | |
1682 | case 0x02: | |
1683 | st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; | |
1684 | break; | |
1685 | case 0x03: | |
1686 | st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; | |
1687 | break; | |
1688 | } | |
1689 | } | |
1690 | if (i && language[0]) { | |
1691 | language[i - 1] = 0; | |
1692 | av_dict_set(&st->metadata, "language", language, 0); | |
1693 | } | |
1694 | break; | |
1695 | case 0x05: /* registration descriptor */ | |
1696 | st->codec->codec_tag = bytestream_get_le32(pp); | |
1697 | av_dlog(fc, "reg_desc=%.4s\n", (char *)&st->codec->codec_tag); | |
1698 | if (st->codec->codec_id == AV_CODEC_ID_NONE) | |
1699 | mpegts_find_stream_type(st, st->codec->codec_tag, REGD_types); | |
1700 | break; | |
1701 | case 0x52: /* stream identifier descriptor */ | |
1702 | st->stream_identifier = 1 + get8(pp, desc_end); | |
1703 | break; | |
1704 | case 0x26: /* metadata descriptor */ | |
1705 | if (get16(pp, desc_end) == 0xFFFF) | |
1706 | *pp += 4; | |
1707 | if (get8(pp, desc_end) == 0xFF) { | |
1708 | st->codec->codec_tag = bytestream_get_le32(pp); | |
1709 | if (st->codec->codec_id == AV_CODEC_ID_NONE) | |
1710 | mpegts_find_stream_type(st, st->codec->codec_tag, METADATA_types); | |
1711 | } | |
1712 | break; | |
1713 | default: | |
1714 | break; | |
1715 | } | |
1716 | *pp = desc_end; | |
1717 | return 0; | |
1718 | } | |
1719 | ||
1720 | static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len) | |
1721 | { | |
1722 | MpegTSContext *ts = filter->u.section_filter.opaque; | |
1723 | SectionHeader h1, *h = &h1; | |
1724 | PESContext *pes; | |
1725 | AVStream *st; | |
1726 | const uint8_t *p, *p_end, *desc_list_end; | |
1727 | int program_info_length, pcr_pid, pid, stream_type; | |
1728 | int desc_list_len; | |
1729 | uint32_t prog_reg_desc = 0; /* registration descriptor */ | |
1730 | ||
1731 | int mp4_descr_count = 0; | |
1732 | Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } }; | |
1733 | int i; | |
1734 | ||
1735 | av_dlog(ts->stream, "PMT: len %i\n", section_len); | |
1736 | hex_dump_debug(ts->stream, section, section_len); | |
1737 | ||
1738 | p_end = section + section_len - 4; | |
1739 | p = section; | |
1740 | if (parse_section_header(h, &p, p_end) < 0) | |
1741 | return; | |
1742 | ||
1743 | av_dlog(ts->stream, "sid=0x%x sec_num=%d/%d\n", | |
1744 | h->id, h->sec_num, h->last_sec_num); | |
1745 | ||
1746 | if (h->tid != PMT_TID) | |
1747 | return; | |
1748 | if (ts->skip_changes) | |
1749 | return; | |
1750 | ||
1751 | clear_program(ts, h->id); | |
1752 | pcr_pid = get16(&p, p_end); | |
1753 | if (pcr_pid < 0) | |
1754 | return; | |
1755 | pcr_pid &= 0x1fff; | |
1756 | add_pid_to_pmt(ts, h->id, pcr_pid); | |
1757 | set_pcr_pid(ts->stream, h->id, pcr_pid); | |
1758 | ||
1759 | av_dlog(ts->stream, "pcr_pid=0x%x\n", pcr_pid); | |
1760 | ||
1761 | program_info_length = get16(&p, p_end); | |
1762 | if (program_info_length < 0) | |
1763 | return; | |
1764 | program_info_length &= 0xfff; | |
1765 | while (program_info_length >= 2) { | |
1766 | uint8_t tag, len; | |
1767 | tag = get8(&p, p_end); | |
1768 | len = get8(&p, p_end); | |
1769 | ||
1770 | av_dlog(ts->stream, "program tag: 0x%02x len=%d\n", tag, len); | |
1771 | ||
1772 | if (len > program_info_length - 2) | |
1773 | // something else is broken, exit the program_descriptors_loop | |
1774 | break; | |
1775 | program_info_length -= len + 2; | |
1776 | if (tag == 0x1d) { // IOD descriptor | |
1777 | get8(&p, p_end); // scope | |
1778 | get8(&p, p_end); // label | |
1779 | len -= 2; | |
1780 | mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count, | |
1781 | &mp4_descr_count, MAX_MP4_DESCR_COUNT); | |
1782 | } else if (tag == 0x05 && len >= 4) { // registration descriptor | |
1783 | prog_reg_desc = bytestream_get_le32(&p); | |
1784 | len -= 4; | |
1785 | } | |
1786 | p += len; | |
1787 | } | |
1788 | p += program_info_length; | |
1789 | if (p >= p_end) | |
1790 | goto out; | |
1791 | ||
1792 | // stop parsing after pmt, we found header | |
1793 | if (!ts->stream->nb_streams) | |
1794 | ts->stop_parse = 2; | |
1795 | ||
1796 | set_pmt_found(ts, h->id); | |
1797 | ||
1798 | ||
1799 | for (;;) { | |
1800 | st = 0; | |
1801 | pes = NULL; | |
1802 | stream_type = get8(&p, p_end); | |
1803 | if (stream_type < 0) | |
1804 | break; | |
1805 | pid = get16(&p, p_end); | |
1806 | if (pid < 0) | |
1807 | goto out; | |
1808 | pid &= 0x1fff; | |
1809 | if (pid == ts->current_pid) | |
1810 | goto out; | |
1811 | ||
1812 | /* now create stream */ | |
1813 | if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) { | |
1814 | pes = ts->pids[pid]->u.pes_filter.opaque; | |
1815 | if (!pes->st) { | |
1816 | pes->st = avformat_new_stream(pes->stream, NULL); | |
1817 | if (!pes->st) | |
1818 | goto out; | |
1819 | pes->st->id = pes->pid; | |
1820 | } | |
1821 | st = pes->st; | |
1822 | } else if (stream_type != 0x13) { | |
1823 | if (ts->pids[pid]) | |
1824 | mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably | |
1825 | pes = add_pes_stream(ts, pid, pcr_pid); | |
1826 | if (pes) { | |
1827 | st = avformat_new_stream(pes->stream, NULL); | |
1828 | if (!st) | |
1829 | goto out; | |
1830 | st->id = pes->pid; | |
1831 | } | |
1832 | } else { | |
1833 | int idx = ff_find_stream_index(ts->stream, pid); | |
1834 | if (idx >= 0) { | |
1835 | st = ts->stream->streams[idx]; | |
1836 | } else { | |
1837 | st = avformat_new_stream(ts->stream, NULL); | |
1838 | if (!st) | |
1839 | goto out; | |
1840 | st->id = pid; | |
1841 | st->codec->codec_type = AVMEDIA_TYPE_DATA; | |
1842 | } | |
1843 | } | |
1844 | ||
1845 | if (!st) | |
1846 | goto out; | |
1847 | ||
1848 | if (pes && !pes->stream_type) | |
1849 | mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc); | |
1850 | ||
1851 | add_pid_to_pmt(ts, h->id, pid); | |
1852 | ||
1853 | ff_program_add_stream_index(ts->stream, h->id, st->index); | |
1854 | ||
1855 | desc_list_len = get16(&p, p_end); | |
1856 | if (desc_list_len < 0) | |
1857 | goto out; | |
1858 | desc_list_len &= 0xfff; | |
1859 | desc_list_end = p + desc_list_len; | |
1860 | if (desc_list_end > p_end) | |
1861 | goto out; | |
1862 | for (;;) { | |
1863 | if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p, | |
1864 | desc_list_end, mp4_descr, | |
1865 | mp4_descr_count, pid, ts) < 0) | |
1866 | break; | |
1867 | ||
1868 | if (pes && prog_reg_desc == AV_RL32("HDMV") && | |
1869 | stream_type == 0x83 && pes->sub_st) { | |
1870 | ff_program_add_stream_index(ts->stream, h->id, | |
1871 | pes->sub_st->index); | |
1872 | pes->sub_st->codec->codec_tag = st->codec->codec_tag; | |
1873 | } | |
1874 | } | |
1875 | p = desc_list_end; | |
1876 | } | |
1877 | ||
1878 | if (!ts->pids[pcr_pid]) | |
1879 | mpegts_open_pcr_filter(ts, pcr_pid); | |
1880 | ||
1881 | out: | |
1882 | for (i = 0; i < mp4_descr_count; i++) | |
1883 | av_free(mp4_descr[i].dec_config_descr); | |
1884 | } | |
1885 | ||
1886 | static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len) | |
1887 | { | |
1888 | MpegTSContext *ts = filter->u.section_filter.opaque; | |
1889 | SectionHeader h1, *h = &h1; | |
1890 | const uint8_t *p, *p_end; | |
1891 | int sid, pmt_pid; | |
1892 | AVProgram *program; | |
1893 | ||
1894 | av_dlog(ts->stream, "PAT:\n"); | |
1895 | hex_dump_debug(ts->stream, section, section_len); | |
1896 | ||
1897 | p_end = section + section_len - 4; | |
1898 | p = section; | |
1899 | if (parse_section_header(h, &p, p_end) < 0) | |
1900 | return; | |
1901 | if (h->tid != PAT_TID) | |
1902 | return; | |
1903 | if (ts->skip_changes) | |
1904 | return; | |
1905 | ||
1906 | ts->stream->ts_id = h->id; | |
1907 | ||
1908 | clear_programs(ts); | |
1909 | for (;;) { | |
1910 | sid = get16(&p, p_end); | |
1911 | if (sid < 0) | |
1912 | break; | |
1913 | pmt_pid = get16(&p, p_end); | |
1914 | if (pmt_pid < 0) | |
1915 | break; | |
1916 | pmt_pid &= 0x1fff; | |
1917 | ||
1918 | if (pmt_pid == ts->current_pid) | |
1919 | break; | |
1920 | ||
1921 | av_dlog(ts->stream, "sid=0x%x pid=0x%x\n", sid, pmt_pid); | |
1922 | ||
1923 | if (sid == 0x0000) { | |
1924 | /* NIT info */ | |
1925 | } else { | |
1926 | MpegTSFilter *fil = ts->pids[pmt_pid]; | |
1927 | program = av_new_program(ts->stream, sid); | |
1928 | program->program_num = sid; | |
1929 | program->pmt_pid = pmt_pid; | |
1930 | if (fil) | |
1931 | if ( fil->type != MPEGTS_SECTION | |
1932 | || fil->pid != pmt_pid | |
1933 | || fil->u.section_filter.section_cb != pmt_cb) | |
1934 | mpegts_close_filter(ts, ts->pids[pmt_pid]); | |
1935 | ||
1936 | if (!ts->pids[pmt_pid]) | |
1937 | mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1); | |
1938 | add_pat_entry(ts, sid); | |
1939 | add_pid_to_pmt(ts, sid, 0); // add pat pid to program | |
1940 | add_pid_to_pmt(ts, sid, pmt_pid); | |
1941 | } | |
1942 | } | |
1943 | ||
1944 | if (sid < 0) { | |
1945 | int i,j; | |
1946 | for (j=0; j<ts->stream->nb_programs; j++) { | |
1947 | for (i = 0; i < ts->nb_prg; i++) | |
1948 | if (ts->prg[i].id == ts->stream->programs[j]->id) | |
1949 | break; | |
1950 | if (i==ts->nb_prg && !ts->skip_clear) | |
1951 | clear_avprogram(ts, ts->stream->programs[j]->id); | |
1952 | } | |
1953 | } | |
1954 | } | |
1955 | ||
1956 | static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len) | |
1957 | { | |
1958 | MpegTSContext *ts = filter->u.section_filter.opaque; | |
1959 | SectionHeader h1, *h = &h1; | |
1960 | const uint8_t *p, *p_end, *desc_list_end, *desc_end; | |
1961 | int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type; | |
1962 | char *name, *provider_name; | |
1963 | ||
1964 | av_dlog(ts->stream, "SDT:\n"); | |
1965 | hex_dump_debug(ts->stream, section, section_len); | |
1966 | ||
1967 | p_end = section + section_len - 4; | |
1968 | p = section; | |
1969 | if (parse_section_header(h, &p, p_end) < 0) | |
1970 | return; | |
1971 | if (h->tid != SDT_TID) | |
1972 | return; | |
1973 | if (ts->skip_changes) | |
1974 | return; | |
1975 | onid = get16(&p, p_end); | |
1976 | if (onid < 0) | |
1977 | return; | |
1978 | val = get8(&p, p_end); | |
1979 | if (val < 0) | |
1980 | return; | |
1981 | for (;;) { | |
1982 | sid = get16(&p, p_end); | |
1983 | if (sid < 0) | |
1984 | break; | |
1985 | val = get8(&p, p_end); | |
1986 | if (val < 0) | |
1987 | break; | |
1988 | desc_list_len = get16(&p, p_end); | |
1989 | if (desc_list_len < 0) | |
1990 | break; | |
1991 | desc_list_len &= 0xfff; | |
1992 | desc_list_end = p + desc_list_len; | |
1993 | if (desc_list_end > p_end) | |
1994 | break; | |
1995 | for (;;) { | |
1996 | desc_tag = get8(&p, desc_list_end); | |
1997 | if (desc_tag < 0) | |
1998 | break; | |
1999 | desc_len = get8(&p, desc_list_end); | |
2000 | desc_end = p + desc_len; | |
2001 | if (desc_len < 0 || desc_end > desc_list_end) | |
2002 | break; | |
2003 | ||
2004 | av_dlog(ts->stream, "tag: 0x%02x len=%d\n", | |
2005 | desc_tag, desc_len); | |
2006 | ||
2007 | switch (desc_tag) { | |
2008 | case 0x48: | |
2009 | service_type = get8(&p, p_end); | |
2010 | if (service_type < 0) | |
2011 | break; | |
2012 | provider_name = getstr8(&p, p_end); | |
2013 | if (!provider_name) | |
2014 | break; | |
2015 | name = getstr8(&p, p_end); | |
2016 | if (name) { | |
2017 | AVProgram *program = av_new_program(ts->stream, sid); | |
2018 | if (program) { | |
2019 | av_dict_set(&program->metadata, "service_name", name, 0); | |
2020 | av_dict_set(&program->metadata, "service_provider", | |
2021 | provider_name, 0); | |
2022 | } | |
2023 | } | |
2024 | av_free(name); | |
2025 | av_free(provider_name); | |
2026 | break; | |
2027 | default: | |
2028 | break; | |
2029 | } | |
2030 | p = desc_end; | |
2031 | } | |
2032 | p = desc_list_end; | |
2033 | } | |
2034 | } | |
2035 | ||
2036 | static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, | |
2037 | const uint8_t *packet); | |
2038 | ||
2039 | /* handle one TS packet */ | |
2040 | static int handle_packet(MpegTSContext *ts, const uint8_t *packet) | |
2041 | { | |
2042 | MpegTSFilter *tss; | |
2043 | int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity, | |
2044 | has_adaptation, has_payload; | |
2045 | const uint8_t *p, *p_end; | |
2046 | int64_t pos; | |
2047 | ||
2048 | pid = AV_RB16(packet + 1) & 0x1fff; | |
2049 | if (pid && discard_pid(ts, pid)) | |
2050 | return 0; | |
2051 | is_start = packet[1] & 0x40; | |
2052 | tss = ts->pids[pid]; | |
2053 | if (ts->auto_guess && !tss && is_start) { | |
2054 | add_pes_stream(ts, pid, -1); | |
2055 | tss = ts->pids[pid]; | |
2056 | } | |
2057 | if (!tss) | |
2058 | return 0; | |
2059 | ts->current_pid = pid; | |
2060 | ||
2061 | afc = (packet[3] >> 4) & 3; | |
2062 | if (afc == 0) /* reserved value */ | |
2063 | return 0; | |
2064 | has_adaptation = afc & 2; | |
2065 | has_payload = afc & 1; | |
2066 | is_discontinuity = has_adaptation && | |
2067 | packet[4] != 0 && /* with length > 0 */ | |
2068 | (packet[5] & 0x80); /* and discontinuity indicated */ | |
2069 | ||
2070 | /* continuity check (currently not used) */ | |
2071 | cc = (packet[3] & 0xf); | |
2072 | expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc; | |
2073 | cc_ok = pid == 0x1FFF || // null packet PID | |
2074 | is_discontinuity || | |
2075 | tss->last_cc < 0 || | |
2076 | expected_cc == cc; | |
2077 | ||
2078 | tss->last_cc = cc; | |
2079 | if (!cc_ok) { | |
2080 | av_log(ts->stream, AV_LOG_DEBUG, | |
2081 | "Continuity check failed for pid %d expected %d got %d\n", | |
2082 | pid, expected_cc, cc); | |
2083 | if (tss->type == MPEGTS_PES) { | |
2084 | PESContext *pc = tss->u.pes_filter.opaque; | |
2085 | pc->flags |= AV_PKT_FLAG_CORRUPT; | |
2086 | } | |
2087 | } | |
2088 | ||
2089 | p = packet + 4; | |
2090 | if (has_adaptation) { | |
2091 | int64_t pcr_h; | |
2092 | int pcr_l; | |
2093 | if (parse_pcr(&pcr_h, &pcr_l, packet) == 0) | |
2094 | tss->last_pcr = pcr_h * 300 + pcr_l; | |
2095 | /* skip adaptation field */ | |
2096 | p += p[0] + 1; | |
2097 | } | |
2098 | /* if past the end of packet, ignore */ | |
2099 | p_end = packet + TS_PACKET_SIZE; | |
2100 | if (p >= p_end || !has_payload) | |
2101 | return 0; | |
2102 | ||
2103 | pos = avio_tell(ts->stream->pb); | |
2104 | if (pos >= 0) { | |
2105 | av_assert0(pos >= TS_PACKET_SIZE); | |
2106 | ts->pos47_full = pos - TS_PACKET_SIZE; | |
2107 | } | |
2108 | ||
2109 | if (tss->type == MPEGTS_SECTION) { | |
2110 | if (is_start) { | |
2111 | /* pointer field present */ | |
2112 | len = *p++; | |
2113 | if (p + len > p_end) | |
2114 | return 0; | |
2115 | if (len && cc_ok) { | |
2116 | /* write remaining section bytes */ | |
2117 | write_section_data(ts, tss, | |
2118 | p, len, 0); | |
2119 | /* check whether filter has been closed */ | |
2120 | if (!ts->pids[pid]) | |
2121 | return 0; | |
2122 | } | |
2123 | p += len; | |
2124 | if (p < p_end) { | |
2125 | write_section_data(ts, tss, | |
2126 | p, p_end - p, 1); | |
2127 | } | |
2128 | } else { | |
2129 | if (cc_ok) { | |
2130 | write_section_data(ts, tss, | |
2131 | p, p_end - p, 0); | |
2132 | } | |
2133 | } | |
2134 | ||
2135 | // stop find_stream_info from waiting for more streams | |
2136 | // when all programs have received a PMT | |
2137 | if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER) { | |
2138 | int i; | |
2139 | for (i = 0; i < ts->nb_prg; i++) { | |
2140 | if (!ts->prg[i].pmt_found) | |
2141 | break; | |
2142 | } | |
2143 | if (i == ts->nb_prg && ts->nb_prg > 0) { | |
2144 | if (ts->stream->nb_streams > 1 || pos > 100000) { | |
2145 | av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n"); | |
2146 | ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER; | |
2147 | } | |
2148 | } | |
2149 | } | |
2150 | ||
2151 | } else { | |
2152 | int ret; | |
2153 | // Note: The position here points actually behind the current packet. | |
2154 | if (tss->type == MPEGTS_PES) { | |
2155 | if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start, | |
2156 | pos - ts->raw_packet_size)) < 0) | |
2157 | return ret; | |
2158 | } | |
2159 | } | |
2160 | ||
2161 | return 0; | |
2162 | } | |
2163 | ||
2164 | static void reanalyze(MpegTSContext *ts) { | |
2165 | AVIOContext *pb = ts->stream->pb; | |
2166 | int64_t pos = avio_tell(pb); | |
2167 | if (pos < 0) | |
2168 | return; | |
2169 | pos -= ts->pos47_full; | |
2170 | if (pos == TS_PACKET_SIZE) { | |
2171 | ts->size_stat[0] ++; | |
2172 | } else if (pos == TS_DVHS_PACKET_SIZE) { | |
2173 | ts->size_stat[1] ++; | |
2174 | } else if (pos == TS_FEC_PACKET_SIZE) { | |
2175 | ts->size_stat[2] ++; | |
2176 | } | |
2177 | ||
2178 | ts->size_stat_count ++; | |
2179 | if (ts->size_stat_count > SIZE_STAT_THRESHOLD) { | |
2180 | int newsize = 0; | |
2181 | if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) { | |
2182 | newsize = TS_PACKET_SIZE; | |
2183 | } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) { | |
2184 | newsize = TS_DVHS_PACKET_SIZE; | |
2185 | } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) { | |
2186 | newsize = TS_FEC_PACKET_SIZE; | |
2187 | } | |
2188 | if (newsize && newsize != ts->raw_packet_size) { | |
2189 | av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize); | |
2190 | ts->raw_packet_size = newsize; | |
2191 | } | |
2192 | ts->size_stat_count = 0; | |
2193 | memset(ts->size_stat, 0, sizeof(ts->size_stat)); | |
2194 | } | |
2195 | } | |
2196 | ||
2197 | /* XXX: try to find a better synchro over several packets (use | |
2198 | * get_packet_size() ?) */ | |
2199 | static int mpegts_resync(AVFormatContext *s) | |
2200 | { | |
2201 | MpegTSContext *ts = s->priv_data; | |
2202 | AVIOContext *pb = s->pb; | |
2203 | int c, i; | |
2204 | ||
2205 | for (i = 0; i < ts->resync_size; i++) { | |
2206 | c = avio_r8(pb); | |
2207 | if (avio_feof(pb)) | |
2208 | return AVERROR_EOF; | |
2209 | if (c == 0x47) { | |
2210 | avio_seek(pb, -1, SEEK_CUR); | |
2211 | reanalyze(s->priv_data); | |
2212 | return 0; | |
2213 | } | |
2214 | } | |
2215 | av_log(s, AV_LOG_ERROR, | |
2216 | "max resync size reached, could not find sync byte\n"); | |
2217 | /* no sync found */ | |
2218 | return AVERROR_INVALIDDATA; | |
2219 | } | |
2220 | ||
2221 | /* return AVERROR_something if error or EOF. Return 0 if OK. */ | |
2222 | static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size, | |
2223 | const uint8_t **data) | |
2224 | { | |
2225 | AVIOContext *pb = s->pb; | |
2226 | int len; | |
2227 | ||
2228 | for (;;) { | |
2229 | len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data); | |
2230 | if (len != TS_PACKET_SIZE) | |
2231 | return len < 0 ? len : AVERROR_EOF; | |
2232 | /* check packet sync byte */ | |
2233 | if ((*data)[0] != 0x47) { | |
2234 | /* find a new packet start */ | |
2235 | uint64_t pos = avio_tell(pb); | |
2236 | avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR); | |
2237 | ||
2238 | if (mpegts_resync(s) < 0) | |
2239 | return AVERROR(EAGAIN); | |
2240 | else | |
2241 | continue; | |
2242 | } else { | |
2243 | break; | |
2244 | } | |
2245 | } | |
2246 | return 0; | |
2247 | } | |
2248 | ||
2249 | static void finished_reading_packet(AVFormatContext *s, int raw_packet_size) | |
2250 | { | |
2251 | AVIOContext *pb = s->pb; | |
2252 | int skip = raw_packet_size - TS_PACKET_SIZE; | |
2253 | if (skip > 0) | |
2254 | avio_skip(pb, skip); | |
2255 | } | |
2256 | ||
2257 | static int handle_packets(MpegTSContext *ts, int64_t nb_packets) | |
2258 | { | |
2259 | AVFormatContext *s = ts->stream; | |
2260 | uint8_t packet[TS_PACKET_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; | |
2261 | const uint8_t *data; | |
2262 | int64_t packet_num; | |
2263 | int ret = 0; | |
2264 | ||
2265 | if (avio_tell(s->pb) != ts->last_pos) { | |
2266 | int i; | |
2267 | av_dlog(ts->stream, "Skipping after seek\n"); | |
2268 | /* seek detected, flush pes buffer */ | |
2269 | for (i = 0; i < NB_PID_MAX; i++) { | |
2270 | if (ts->pids[i]) { | |
2271 | if (ts->pids[i]->type == MPEGTS_PES) { | |
2272 | PESContext *pes = ts->pids[i]->u.pes_filter.opaque; | |
2273 | av_buffer_unref(&pes->buffer); | |
2274 | pes->data_index = 0; | |
2275 | pes->state = MPEGTS_SKIP; /* skip until pes header */ | |
2276 | } | |
2277 | ts->pids[i]->last_cc = -1; | |
2278 | ts->pids[i]->last_pcr = -1; | |
2279 | } | |
2280 | } | |
2281 | } | |
2282 | ||
2283 | ts->stop_parse = 0; | |
2284 | packet_num = 0; | |
2285 | memset(packet + TS_PACKET_SIZE, 0, FF_INPUT_BUFFER_PADDING_SIZE); | |
2286 | for (;;) { | |
2287 | packet_num++; | |
2288 | if (nb_packets != 0 && packet_num >= nb_packets || | |
2289 | ts->stop_parse > 1) { | |
2290 | ret = AVERROR(EAGAIN); | |
2291 | break; | |
2292 | } | |
2293 | if (ts->stop_parse > 0) | |
2294 | break; | |
2295 | ||
2296 | ret = read_packet(s, packet, ts->raw_packet_size, &data); | |
2297 | if (ret != 0) | |
2298 | break; | |
2299 | ret = handle_packet(ts, data); | |
2300 | finished_reading_packet(s, ts->raw_packet_size); | |
2301 | if (ret != 0) | |
2302 | break; | |
2303 | } | |
2304 | ts->last_pos = avio_tell(s->pb); | |
2305 | return ret; | |
2306 | } | |
2307 | ||
2308 | static int mpegts_probe(AVProbeData *p) | |
2309 | { | |
2310 | const int size = p->buf_size; | |
2311 | int maxscore = 0; | |
2312 | int sumscore = 0; | |
2313 | int i; | |
2314 | int check_count = size / TS_FEC_PACKET_SIZE; | |
2315 | #define CHECK_COUNT 10 | |
2316 | #define CHECK_BLOCK 100 | |
2317 | ||
2318 | if (check_count < CHECK_COUNT) | |
2319 | return AVERROR_INVALIDDATA; | |
2320 | ||
2321 | for (i = 0; i<check_count; i+=CHECK_BLOCK) { | |
2322 | int left = FFMIN(check_count - i, CHECK_BLOCK); | |
2323 | int score = analyze(p->buf + TS_PACKET_SIZE *i, TS_PACKET_SIZE *left, TS_PACKET_SIZE , NULL); | |
2324 | int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, NULL); | |
2325 | int fec_score = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , NULL); | |
2326 | score = FFMAX3(score, dvhs_score, fec_score); | |
2327 | sumscore += score; | |
2328 | maxscore = FFMAX(maxscore, score); | |
2329 | } | |
2330 | ||
2331 | sumscore = sumscore * CHECK_COUNT / check_count; | |
2332 | maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK; | |
2333 | ||
2334 | av_dlog(0, "TS score: %d %d\n", sumscore, maxscore); | |
2335 | ||
2336 | if (sumscore > 6) return AVPROBE_SCORE_MAX + sumscore - CHECK_COUNT; | |
2337 | else if (maxscore > 6) return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT; | |
2338 | else | |
2339 | return AVERROR_INVALIDDATA; | |
2340 | } | |
2341 | ||
2342 | /* return the 90kHz PCR and the extension for the 27MHz PCR. return | |
2343 | * (-1) if not available */ | |
2344 | static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet) | |
2345 | { | |
2346 | int afc, len, flags; | |
2347 | const uint8_t *p; | |
2348 | unsigned int v; | |
2349 | ||
2350 | afc = (packet[3] >> 4) & 3; | |
2351 | if (afc <= 1) | |
2352 | return AVERROR_INVALIDDATA; | |
2353 | p = packet + 4; | |
2354 | len = p[0]; | |
2355 | p++; | |
2356 | if (len == 0) | |
2357 | return AVERROR_INVALIDDATA; | |
2358 | flags = *p++; | |
2359 | len--; | |
2360 | if (!(flags & 0x10)) | |
2361 | return AVERROR_INVALIDDATA; | |
2362 | if (len < 6) | |
2363 | return AVERROR_INVALIDDATA; | |
2364 | v = AV_RB32(p); | |
2365 | *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7); | |
2366 | *ppcr_low = ((p[4] & 1) << 8) | p[5]; | |
2367 | return 0; | |
2368 | } | |
2369 | ||
2370 | static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) { | |
2371 | ||
2372 | /* NOTE: We attempt to seek on non-seekable files as well, as the | |
2373 | * probe buffer usually is big enough. Only warn if the seek failed | |
2374 | * on files where the seek should work. */ | |
2375 | if (avio_seek(pb, pos, SEEK_SET) < 0) | |
2376 | av_log(s, pb->seekable ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n"); | |
2377 | } | |
2378 | ||
2379 | static int mpegts_read_header(AVFormatContext *s) | |
2380 | { | |
2381 | MpegTSContext *ts = s->priv_data; | |
2382 | AVIOContext *pb = s->pb; | |
2383 | uint8_t buf[8 * 1024] = {0}; | |
2384 | int len; | |
2385 | int64_t pos, probesize = s->probesize ? s->probesize : s->probesize2; | |
2386 | ||
2387 | ffio_ensure_seekback(pb, probesize); | |
2388 | ||
2389 | /* read the first 8192 bytes to get packet size */ | |
2390 | pos = avio_tell(pb); | |
2391 | len = avio_read(pb, buf, sizeof(buf)); | |
2392 | ts->raw_packet_size = get_packet_size(buf, len); | |
2393 | if (ts->raw_packet_size <= 0) { | |
2394 | av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n"); | |
2395 | ts->raw_packet_size = TS_PACKET_SIZE; | |
2396 | } | |
2397 | ts->stream = s; | |
2398 | ts->auto_guess = 0; | |
2399 | ||
2400 | if (s->iformat == &ff_mpegts_demuxer) { | |
2401 | /* normal demux */ | |
2402 | ||
2403 | /* first do a scan to get all the services */ | |
2404 | seek_back(s, pb, pos); | |
2405 | ||
2406 | mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1); | |
2407 | ||
2408 | mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1); | |
2409 | ||
2410 | handle_packets(ts, probesize / ts->raw_packet_size); | |
2411 | /* if could not find service, enable auto_guess */ | |
2412 | ||
2413 | ts->auto_guess = 1; | |
2414 | ||
2415 | av_dlog(ts->stream, "tuning done\n"); | |
2416 | ||
2417 | s->ctx_flags |= AVFMTCTX_NOHEADER; | |
2418 | } else { | |
2419 | AVStream *st; | |
2420 | int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l; | |
2421 | int64_t pcrs[2], pcr_h; | |
2422 | int packet_count[2]; | |
2423 | uint8_t packet[TS_PACKET_SIZE]; | |
2424 | const uint8_t *data; | |
2425 | ||
2426 | /* only read packets */ | |
2427 | ||
2428 | st = avformat_new_stream(s, NULL); | |
2429 | if (!st) | |
2430 | return AVERROR(ENOMEM); | |
2431 | avpriv_set_pts_info(st, 60, 1, 27000000); | |
2432 | st->codec->codec_type = AVMEDIA_TYPE_DATA; | |
2433 | st->codec->codec_id = AV_CODEC_ID_MPEG2TS; | |
2434 | ||
2435 | /* we iterate until we find two PCRs to estimate the bitrate */ | |
2436 | pcr_pid = -1; | |
2437 | nb_pcrs = 0; | |
2438 | nb_packets = 0; | |
2439 | for (;;) { | |
2440 | ret = read_packet(s, packet, ts->raw_packet_size, &data); | |
2441 | if (ret < 0) | |
2442 | return ret; | |
2443 | pid = AV_RB16(data + 1) & 0x1fff; | |
2444 | if ((pcr_pid == -1 || pcr_pid == pid) && | |
2445 | parse_pcr(&pcr_h, &pcr_l, data) == 0) { | |
2446 | finished_reading_packet(s, ts->raw_packet_size); | |
2447 | pcr_pid = pid; | |
2448 | packet_count[nb_pcrs] = nb_packets; | |
2449 | pcrs[nb_pcrs] = pcr_h * 300 + pcr_l; | |
2450 | nb_pcrs++; | |
2451 | if (nb_pcrs >= 2) | |
2452 | break; | |
2453 | } else { | |
2454 | finished_reading_packet(s, ts->raw_packet_size); | |
2455 | } | |
2456 | nb_packets++; | |
2457 | } | |
2458 | ||
2459 | /* NOTE1: the bitrate is computed without the FEC */ | |
2460 | /* NOTE2: it is only the bitrate of the start of the stream */ | |
2461 | ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]); | |
2462 | ts->cur_pcr = pcrs[0] - ts->pcr_incr * packet_count[0]; | |
2463 | s->bit_rate = TS_PACKET_SIZE * 8 * 27e6 / ts->pcr_incr; | |
2464 | st->codec->bit_rate = s->bit_rate; | |
2465 | st->start_time = ts->cur_pcr; | |
2466 | av_dlog(ts->stream, "start=%0.3f pcr=%0.3f incr=%d\n", | |
2467 | st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr); | |
2468 | } | |
2469 | ||
2470 | seek_back(s, pb, pos); | |
2471 | return 0; | |
2472 | } | |
2473 | ||
2474 | #define MAX_PACKET_READAHEAD ((128 * 1024) / 188) | |
2475 | ||
2476 | static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt) | |
2477 | { | |
2478 | MpegTSContext *ts = s->priv_data; | |
2479 | int ret, i; | |
2480 | int64_t pcr_h, next_pcr_h, pos; | |
2481 | int pcr_l, next_pcr_l; | |
2482 | uint8_t pcr_buf[12]; | |
2483 | const uint8_t *data; | |
2484 | ||
2485 | if (av_new_packet(pkt, TS_PACKET_SIZE) < 0) | |
2486 | return AVERROR(ENOMEM); | |
2487 | ret = read_packet(s, pkt->data, ts->raw_packet_size, &data); | |
2488 | pkt->pos = avio_tell(s->pb); | |
2489 | if (ret < 0) { | |
2490 | av_free_packet(pkt); | |
2491 | return ret; | |
2492 | } | |
2493 | if (data != pkt->data) | |
2494 | memcpy(pkt->data, data, ts->raw_packet_size); | |
2495 | finished_reading_packet(s, ts->raw_packet_size); | |
2496 | if (ts->mpeg2ts_compute_pcr) { | |
2497 | /* compute exact PCR for each packet */ | |
2498 | if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) { | |
2499 | /* we read the next PCR (XXX: optimize it by using a bigger buffer */ | |
2500 | pos = avio_tell(s->pb); | |
2501 | for (i = 0; i < MAX_PACKET_READAHEAD; i++) { | |
2502 | avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET); | |
2503 | avio_read(s->pb, pcr_buf, 12); | |
2504 | if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) { | |
2505 | /* XXX: not precise enough */ | |
2506 | ts->pcr_incr = | |
2507 | ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) / | |
2508 | (i + 1); | |
2509 | break; | |
2510 | } | |
2511 | } | |
2512 | avio_seek(s->pb, pos, SEEK_SET); | |
2513 | /* no next PCR found: we use previous increment */ | |
2514 | ts->cur_pcr = pcr_h * 300 + pcr_l; | |
2515 | } | |
2516 | pkt->pts = ts->cur_pcr; | |
2517 | pkt->duration = ts->pcr_incr; | |
2518 | ts->cur_pcr += ts->pcr_incr; | |
2519 | } | |
2520 | pkt->stream_index = 0; | |
2521 | return 0; | |
2522 | } | |
2523 | ||
2524 | static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt) | |
2525 | { | |
2526 | MpegTSContext *ts = s->priv_data; | |
2527 | int ret, i; | |
2528 | ||
2529 | pkt->size = -1; | |
2530 | ts->pkt = pkt; | |
2531 | ret = handle_packets(ts, 0); | |
2532 | if (ret < 0) { | |
2533 | av_free_packet(ts->pkt); | |
2534 | /* flush pes data left */ | |
2535 | for (i = 0; i < NB_PID_MAX; i++) | |
2536 | if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) { | |
2537 | PESContext *pes = ts->pids[i]->u.pes_filter.opaque; | |
2538 | if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) { | |
2539 | new_pes_packet(pes, pkt); | |
2540 | pes->state = MPEGTS_SKIP; | |
2541 | ret = 0; | |
2542 | break; | |
2543 | } | |
2544 | } | |
2545 | } | |
2546 | ||
2547 | if (!ret && pkt->size < 0) | |
2548 | ret = AVERROR(EINTR); | |
2549 | return ret; | |
2550 | } | |
2551 | ||
2552 | static void mpegts_free(MpegTSContext *ts) | |
2553 | { | |
2554 | int i; | |
2555 | ||
2556 | clear_programs(ts); | |
2557 | ||
2558 | for (i = 0; i < NB_PID_MAX; i++) | |
2559 | if (ts->pids[i]) | |
2560 | mpegts_close_filter(ts, ts->pids[i]); | |
2561 | } | |
2562 | ||
2563 | static int mpegts_read_close(AVFormatContext *s) | |
2564 | { | |
2565 | MpegTSContext *ts = s->priv_data; | |
2566 | mpegts_free(ts); | |
2567 | return 0; | |
2568 | } | |
2569 | ||
2570 | static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index, | |
2571 | int64_t *ppos, int64_t pos_limit) | |
2572 | { | |
2573 | MpegTSContext *ts = s->priv_data; | |
2574 | int64_t pos, timestamp; | |
2575 | uint8_t buf[TS_PACKET_SIZE]; | |
2576 | int pcr_l, pcr_pid = | |
2577 | ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid; | |
2578 | int pos47 = ts->pos47_full % ts->raw_packet_size; | |
2579 | pos = | |
2580 | ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * | |
2581 | ts->raw_packet_size + pos47; | |
2582 | while(pos < pos_limit) { | |
2583 | if (avio_seek(s->pb, pos, SEEK_SET) < 0) | |
2584 | return AV_NOPTS_VALUE; | |
2585 | if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE) | |
2586 | return AV_NOPTS_VALUE; | |
2587 | if (buf[0] != 0x47) { | |
2588 | avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR); | |
2589 | if (mpegts_resync(s) < 0) | |
2590 | return AV_NOPTS_VALUE; | |
2591 | pos = avio_tell(s->pb); | |
2592 | continue; | |
2593 | } | |
2594 | if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) && | |
2595 | parse_pcr(×tamp, &pcr_l, buf) == 0) { | |
2596 | *ppos = pos; | |
2597 | return timestamp; | |
2598 | } | |
2599 | pos += ts->raw_packet_size; | |
2600 | } | |
2601 | ||
2602 | return AV_NOPTS_VALUE; | |
2603 | } | |
2604 | ||
2605 | static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index, | |
2606 | int64_t *ppos, int64_t pos_limit) | |
2607 | { | |
2608 | MpegTSContext *ts = s->priv_data; | |
2609 | int64_t pos; | |
2610 | int pos47 = ts->pos47_full % ts->raw_packet_size; | |
2611 | pos = ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47; | |
2612 | ff_read_frame_flush(s); | |
2613 | if (avio_seek(s->pb, pos, SEEK_SET) < 0) | |
2614 | return AV_NOPTS_VALUE; | |
2615 | while(pos < pos_limit) { | |
2616 | int ret; | |
2617 | AVPacket pkt; | |
2618 | av_init_packet(&pkt); | |
2619 | ret = av_read_frame(s, &pkt); | |
2620 | if (ret < 0) | |
2621 | return AV_NOPTS_VALUE; | |
2622 | av_free_packet(&pkt); | |
2623 | if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) { | |
2624 | ff_reduce_index(s, pkt.stream_index); | |
2625 | av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */); | |
2626 | if (pkt.stream_index == stream_index && pkt.pos >= *ppos) { | |
2627 | *ppos = pkt.pos; | |
2628 | return pkt.dts; | |
2629 | } | |
2630 | } | |
2631 | pos = pkt.pos; | |
2632 | } | |
2633 | ||
2634 | return AV_NOPTS_VALUE; | |
2635 | } | |
2636 | ||
2637 | /**************************************************************/ | |
2638 | /* parsing functions - called from other demuxers such as RTP */ | |
2639 | ||
2640 | MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s) | |
2641 | { | |
2642 | MpegTSContext *ts; | |
2643 | ||
2644 | ts = av_mallocz(sizeof(MpegTSContext)); | |
2645 | if (!ts) | |
2646 | return NULL; | |
2647 | /* no stream case, currently used by RTP */ | |
2648 | ts->raw_packet_size = TS_PACKET_SIZE; | |
2649 | ts->stream = s; | |
2650 | ts->auto_guess = 1; | |
2651 | mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1); | |
2652 | mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1); | |
2653 | ||
2654 | return ts; | |
2655 | } | |
2656 | ||
2657 | /* return the consumed length if a packet was output, or -1 if no | |
2658 | * packet is output */ | |
2659 | int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt, | |
2660 | const uint8_t *buf, int len) | |
2661 | { | |
2662 | int len1; | |
2663 | ||
2664 | len1 = len; | |
2665 | ts->pkt = pkt; | |
2666 | for (;;) { | |
2667 | ts->stop_parse = 0; | |
2668 | if (len < TS_PACKET_SIZE) | |
2669 | return AVERROR_INVALIDDATA; | |
2670 | if (buf[0] != 0x47) { | |
2671 | buf++; | |
2672 | len--; | |
2673 | } else { | |
2674 | handle_packet(ts, buf); | |
2675 | buf += TS_PACKET_SIZE; | |
2676 | len -= TS_PACKET_SIZE; | |
2677 | if (ts->stop_parse == 1) | |
2678 | break; | |
2679 | } | |
2680 | } | |
2681 | return len1 - len; | |
2682 | } | |
2683 | ||
2684 | void avpriv_mpegts_parse_close(MpegTSContext *ts) | |
2685 | { | |
2686 | mpegts_free(ts); | |
2687 | av_free(ts); | |
2688 | } | |
2689 | ||
2690 | AVInputFormat ff_mpegts_demuxer = { | |
2691 | .name = "mpegts", | |
2692 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"), | |
2693 | .priv_data_size = sizeof(MpegTSContext), | |
2694 | .read_probe = mpegts_probe, | |
2695 | .read_header = mpegts_read_header, | |
2696 | .read_packet = mpegts_read_packet, | |
2697 | .read_close = mpegts_read_close, | |
2698 | .read_timestamp = mpegts_get_dts, | |
2699 | .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT, | |
2700 | .priv_class = &mpegts_class, | |
2701 | }; | |
2702 | ||
2703 | AVInputFormat ff_mpegtsraw_demuxer = { | |
2704 | .name = "mpegtsraw", | |
2705 | .long_name = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"), | |
2706 | .priv_data_size = sizeof(MpegTSContext), | |
2707 | .read_header = mpegts_read_header, | |
2708 | .read_packet = mpegts_raw_read_packet, | |
2709 | .read_close = mpegts_read_close, | |
2710 | .read_timestamp = mpegts_get_dts, | |
2711 | .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT, | |
2712 | .priv_class = &mpegtsraw_class, | |
2713 | }; |