1 /*
2 * MPEG-1/2 demuxer
3 * Copyright (c) 2000, 2001, 2002 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 "avformat.h"
23 #include "avio_internal.h"
24 #include "internal.h"
25 #include "mpeg.h"
26
27 #if CONFIG_VOBSUB_DEMUXER
28 # include "subtitles.h"
29 # include "libavutil/bprint.h"
30 # include "libavutil/opt.h"
31 #endif
32
33 #include "libavutil/avassert.h"
34
35 /*********************************************/
36 /* demux code */
37
38 #define MAX_SYNC_SIZE 100000
39
check_pes(const uint8_t * p,const uint8_t * end)40 static int check_pes(const uint8_t *p, const uint8_t *end)
41 {
42 int pes1;
43 int pes2 = (p[3] & 0xC0) == 0x80 &&
44 (p[4] & 0xC0) != 0x40 &&
45 ((p[4] & 0xC0) == 0x00 ||
46 (p[4] & 0xC0) >> 2 == (p[6] & 0xF0));
47
48 for (p += 3; p < end && *p == 0xFF; p++) ;
49 if ((*p & 0xC0) == 0x40)
50 p += 2;
51
52 if ((*p & 0xF0) == 0x20)
53 pes1 = p[0] & p[2] & p[4] & 1;
54 else if ((*p & 0xF0) == 0x30)
55 pes1 = p[0] & p[2] & p[4] & p[5] & p[7] & p[9] & 1;
56 else
57 pes1 = *p == 0x0F;
58
59 return pes1 || pes2;
60 }
61
check_pack_header(const uint8_t * buf)62 static int check_pack_header(const uint8_t *buf)
63 {
64 return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
65 }
66
mpegps_probe(AVProbeData * p)67 static int mpegps_probe(AVProbeData *p)
68 {
69 uint32_t code = -1;
70 int i;
71 int sys = 0, pspack = 0, priv1 = 0, vid = 0;
72 int audio = 0, invalid = 0, score = 0;
73 int endpes = 0;
74
75 for (i = 0; i < p->buf_size; i++) {
76 code = (code << 8) + p->buf[i];
77 if ((code & 0xffffff00) == 0x100) {
78 int len = p->buf[i + 1] << 8 | p->buf[i + 2];
79 int pes = endpes <= i && check_pes(p->buf + i, p->buf + p->buf_size);
80 int pack = check_pack_header(p->buf + i);
81
82 if (code == SYSTEM_HEADER_START_CODE)
83 sys++;
84 else if (code == PACK_START_CODE && pack)
85 pspack++;
86 else if ((code & 0xf0) == VIDEO_ID && pes) {
87 endpes = i + len;
88 vid++;
89 }
90 // skip pes payload to avoid start code emulation for private
91 // and audio streams
92 else if ((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
93 else if (code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
94 else if (code == 0x1fd && pes) vid++; //VC1
95
96 else if ((code & 0xf0) == VIDEO_ID && !pes) invalid++;
97 else if ((code & 0xe0) == AUDIO_ID && !pes) invalid++;
98 else if (code == PRIVATE_STREAM_1 && !pes) invalid++;
99 }
100 }
101
102 if (vid + audio > invalid + 1) /* invalid VDR files nd short PES streams */
103 score = AVPROBE_SCORE_EXTENSION / 2;
104
105 // av_log(NULL, AV_LOG_ERROR, "vid:%d aud:%d sys:%d pspack:%d invalid:%d size:%d \n",
106 // vid, audio, sys, pspack, invalid, p->buf_size);
107
108 if (sys > invalid && sys * 9 <= pspack * 10)
109 return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2
110 : AVPROBE_SCORE_EXTENSION / 2 + 1; // 1 more than mp3
111 if (pspack > invalid && (priv1 + vid + audio) * 10 >= pspack * 9)
112 return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2
113 : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg
114 if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys &&
115 !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */
116 return (audio > 12 || vid > 6 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2
117 : AVPROBE_SCORE_EXTENSION / 2;
118
119 // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
120 // mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
121 // Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618
122 return score;
123 }
124
125 typedef struct MpegDemuxContext {
126 AVClass *class;
127 int32_t header_state;
128 unsigned char psm_es_type[256];
129 int sofdec;
130 int dvd;
131 int imkh_cctv;
132 int raw_ac3;
133 #if CONFIG_VOBSUB_DEMUXER
134 AVFormatContext *sub_ctx;
135 FFDemuxSubtitlesQueue q[32];
136 char *sub_name;
137 #endif
138 } MpegDemuxContext;
139
mpegps_read_header(AVFormatContext * s)140 static int mpegps_read_header(AVFormatContext *s)
141 {
142 MpegDemuxContext *m = s->priv_data;
143 char buffer[7] = { 0 };
144 int64_t last_pos = avio_tell(s->pb);
145
146 m->header_state = 0xff;
147 s->ctx_flags |= AVFMTCTX_NOHEADER;
148
149 avio_get_str(s->pb, 6, buffer, sizeof(buffer));
150 if (!memcmp("IMKH", buffer, 4)) {
151 m->imkh_cctv = 1;
152 } else if (!memcmp("Sofdec", buffer, 6)) {
153 m->sofdec = 1;
154 } else
155 avio_seek(s->pb, last_pos, SEEK_SET);
156
157 /* no need to do more */
158 return 0;
159 }
160
get_pts(AVIOContext * pb,int c)161 static int64_t get_pts(AVIOContext *pb, int c)
162 {
163 uint8_t buf[5];
164
165 buf[0] = c < 0 ? avio_r8(pb) : c;
166 avio_read(pb, buf + 1, 4);
167
168 return ff_parse_pes_pts(buf);
169 }
170
find_next_start_code(AVIOContext * pb,int * size_ptr,int32_t * header_state)171 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
172 int32_t *header_state)
173 {
174 unsigned int state, v;
175 int val, n;
176
177 state = *header_state;
178 n = *size_ptr;
179 while (n > 0) {
180 if (avio_feof(pb))
181 break;
182 v = avio_r8(pb);
183 n--;
184 if (state == 0x000001) {
185 state = ((state << 8) | v) & 0xffffff;
186 val = state;
187 goto found;
188 }
189 state = ((state << 8) | v) & 0xffffff;
190 }
191 val = -1;
192
193 found:
194 *header_state = state;
195 *size_ptr = n;
196 return val;
197 }
198
199 /**
200 * Extract stream types from a program stream map
201 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
202 *
203 * @return number of bytes occupied by PSM in the bitstream
204 */
mpegps_psm_parse(MpegDemuxContext * m,AVIOContext * pb)205 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
206 {
207 int psm_length, ps_info_length, es_map_length;
208
209 psm_length = avio_rb16(pb);
210 avio_r8(pb);
211 avio_r8(pb);
212 ps_info_length = avio_rb16(pb);
213
214 /* skip program_stream_info */
215 avio_skip(pb, ps_info_length);
216 /*es_map_length = */avio_rb16(pb);
217 /* Ignore es_map_length, trust psm_length */
218 es_map_length = psm_length - ps_info_length - 10;
219
220 /* at least one es available? */
221 while (es_map_length >= 4) {
222 unsigned char type = avio_r8(pb);
223 unsigned char es_id = avio_r8(pb);
224 uint16_t es_info_length = avio_rb16(pb);
225
226 /* remember mapping from stream id to stream type */
227 m->psm_es_type[es_id] = type;
228 /* skip program_stream_info */
229 avio_skip(pb, es_info_length);
230 es_map_length -= 4 + es_info_length;
231 }
232 avio_rb32(pb); /* crc32 */
233 return 2 + psm_length;
234 }
235
236 /* read the next PES header. Return its position in ppos
237 * (if not NULL), and its start code, pts and dts.
238 */
mpegps_read_pes_header(AVFormatContext * s,int64_t * ppos,int * pstart_code,int64_t * ppts,int64_t * pdts)239 static int mpegps_read_pes_header(AVFormatContext *s,
240 int64_t *ppos, int *pstart_code,
241 int64_t *ppts, int64_t *pdts)
242 {
243 MpegDemuxContext *m = s->priv_data;
244 int len, size, startcode, c, flags, header_len;
245 int pes_ext, ext2_len, id_ext, skip;
246 int64_t pts, dts;
247 int64_t last_sync = avio_tell(s->pb);
248
249 error_redo:
250 avio_seek(s->pb, last_sync, SEEK_SET);
251 redo:
252 /* next start code (should be immediately after) */
253 m->header_state = 0xff;
254 size = MAX_SYNC_SIZE;
255 startcode = find_next_start_code(s->pb, &size, &m->header_state);
256 last_sync = avio_tell(s->pb);
257 if (startcode < 0) {
258 if (avio_feof(s->pb))
259 return AVERROR_EOF;
260 // FIXME we should remember header_state
261 return FFERROR_REDO;
262 }
263
264 if (startcode == PACK_START_CODE)
265 goto redo;
266 if (startcode == SYSTEM_HEADER_START_CODE)
267 goto redo;
268 if (startcode == PADDING_STREAM) {
269 avio_skip(s->pb, avio_rb16(s->pb));
270 goto redo;
271 }
272 if (startcode == PRIVATE_STREAM_2) {
273 if (!m->sofdec) {
274 /* Need to detect whether this from a DVD or a 'Sofdec' stream */
275 int len = avio_rb16(s->pb);
276 int bytesread = 0;
277 uint8_t *ps2buf = av_malloc(len);
278
279 if (ps2buf) {
280 bytesread = avio_read(s->pb, ps2buf, len);
281
282 if (bytesread != len) {
283 avio_skip(s->pb, len - bytesread);
284 } else {
285 uint8_t *p = 0;
286 if (len >= 6)
287 p = memchr(ps2buf, 'S', len - 5);
288
289 if (p)
290 m->sofdec = !memcmp(p+1, "ofdec", 5);
291
292 m->sofdec -= !m->sofdec;
293
294 if (m->sofdec < 0) {
295 if (len == 980 && ps2buf[0] == 0) {
296 /* PCI structure? */
297 uint32_t startpts = AV_RB32(ps2buf + 0x0d);
298 uint32_t endpts = AV_RB32(ps2buf + 0x11);
299 uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f);
300 uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f);
301 uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f);
302
303 m->dvd = (hours <= 23 &&
304 mins <= 59 &&
305 secs <= 59 &&
306 (ps2buf[0x19] & 0x0f) < 10 &&
307 (ps2buf[0x1a] & 0x0f) < 10 &&
308 (ps2buf[0x1b] & 0x0f) < 10 &&
309 endpts >= startpts);
310 } else if (len == 1018 && ps2buf[0] == 1) {
311 /* DSI structure? */
312 uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f);
313 uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f);
314 uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f);
315
316 m->dvd = (hours <= 23 &&
317 mins <= 59 &&
318 secs <= 59 &&
319 (ps2buf[0x1d] & 0x0f) < 10 &&
320 (ps2buf[0x1e] & 0x0f) < 10 &&
321 (ps2buf[0x1f] & 0x0f) < 10);
322 }
323 }
324 }
325
326 av_free(ps2buf);
327
328 /* If this isn't a DVD packet or no memory
329 * could be allocated, just ignore it.
330 * If we did, move back to the start of the
331 * packet (plus 'length' field) */
332 if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) {
333 /* Skip back failed.
334 * This packet will be lost but that can't be helped
335 * if we can't skip back
336 */
337 goto redo;
338 }
339 } else {
340 /* No memory */
341 avio_skip(s->pb, len);
342 goto redo;
343 }
344 } else if (!m->dvd) {
345 int len = avio_rb16(s->pb);
346 avio_skip(s->pb, len);
347 goto redo;
348 }
349 }
350 if (startcode == PROGRAM_STREAM_MAP) {
351 mpegps_psm_parse(m, s->pb);
352 goto redo;
353 }
354
355 /* find matching stream */
356 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
357 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
358 (startcode == 0x1bd) ||
359 (startcode == PRIVATE_STREAM_2) ||
360 (startcode == 0x1fd)))
361 goto redo;
362 if (ppos) {
363 *ppos = avio_tell(s->pb) - 4;
364 }
365 len = avio_rb16(s->pb);
366 pts =
367 dts = AV_NOPTS_VALUE;
368 if (startcode != PRIVATE_STREAM_2)
369 {
370 /* stuffing */
371 for (;;) {
372 if (len < 1)
373 goto error_redo;
374 c = avio_r8(s->pb);
375 len--;
376 /* XXX: for MPEG-1, should test only bit 7 */
377 if (c != 0xff)
378 break;
379 }
380 if ((c & 0xc0) == 0x40) {
381 /* buffer scale & size */
382 avio_r8(s->pb);
383 c = avio_r8(s->pb);
384 len -= 2;
385 }
386 if ((c & 0xe0) == 0x20) {
387 dts =
388 pts = get_pts(s->pb, c);
389 len -= 4;
390 if (c & 0x10) {
391 dts = get_pts(s->pb, -1);
392 len -= 5;
393 }
394 } else if ((c & 0xc0) == 0x80) {
395 /* mpeg 2 PES */
396 flags = avio_r8(s->pb);
397 header_len = avio_r8(s->pb);
398 len -= 2;
399 if (header_len > len)
400 goto error_redo;
401 len -= header_len;
402 if (flags & 0x80) {
403 dts = pts = get_pts(s->pb, -1);
404 header_len -= 5;
405 if (flags & 0x40) {
406 dts = get_pts(s->pb, -1);
407 header_len -= 5;
408 }
409 }
410 if (flags & 0x3f && header_len == 0) {
411 flags &= 0xC0;
412 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
413 }
414 if (flags & 0x01) { /* PES extension */
415 pes_ext = avio_r8(s->pb);
416 header_len--;
417 /* Skip PES private data, program packet sequence counter
418 * and P-STD buffer */
419 skip = (pes_ext >> 4) & 0xb;
420 skip += skip & 0x9;
421 if (pes_ext & 0x40 || skip > header_len) {
422 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
423 pes_ext = skip = 0;
424 }
425 avio_skip(s->pb, skip);
426 header_len -= skip;
427
428 if (pes_ext & 0x01) { /* PES extension 2 */
429 ext2_len = avio_r8(s->pb);
430 header_len--;
431 if ((ext2_len & 0x7f) > 0) {
432 id_ext = avio_r8(s->pb);
433 if ((id_ext & 0x80) == 0)
434 startcode = ((startcode & 0xff) << 8) | id_ext;
435 header_len--;
436 }
437 }
438 }
439 if (header_len < 0)
440 goto error_redo;
441 avio_skip(s->pb, header_len);
442 } else if (c != 0xf)
443 goto redo;
444 }
445
446 if (startcode == PRIVATE_STREAM_1) {
447 int ret = ffio_ensure_seekback(s->pb, 2);
448
449 if (ret < 0)
450 return ret;
451
452 startcode = avio_r8(s->pb);
453 m->raw_ac3 = 0;
454 if (startcode == 0x0b) {
455 if (avio_r8(s->pb) == 0x77) {
456 startcode = 0x80;
457 m->raw_ac3 = 1;
458 avio_skip(s->pb, -2);
459 } else {
460 avio_skip(s->pb, -1);
461 }
462 } else {
463 len--;
464 }
465 }
466 if (len < 0)
467 goto error_redo;
468 if (dts != AV_NOPTS_VALUE && ppos) {
469 int i;
470 for (i = 0; i < s->nb_streams; i++) {
471 if (startcode == s->streams[i]->id &&
472 (s->pb->seekable & AVIO_SEEKABLE_NORMAL) /* index useless on streams anyway */) {
473 ff_reduce_index(s, i);
474 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0,
475 AVINDEX_KEYFRAME /* FIXME keyframe? */);
476 }
477 }
478 }
479
480 *pstart_code = startcode;
481 *ppts = pts;
482 *pdts = dts;
483 return len;
484 }
485
mpegps_read_packet(AVFormatContext * s,AVPacket * pkt)486 static int mpegps_read_packet(AVFormatContext *s,
487 AVPacket *pkt)
488 {
489 MpegDemuxContext *m = s->priv_data;
490 AVStream *st;
491 int len, startcode, i, es_type, ret;
492 int lpcm_header_len = -1; //Init to suppress warning
493 int request_probe= 0;
494 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
495 enum AVMediaType type;
496 int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work
497
498 redo:
499 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
500 if (len < 0)
501 return len;
502
503 if (startcode >= 0x80 && startcode <= 0xcf) {
504 if (len < 4)
505 goto skip;
506
507 if (!m->raw_ac3) {
508 /* audio: skip header */
509 avio_r8(s->pb);
510 lpcm_header_len = avio_rb16(s->pb);
511 len -= 3;
512 if (startcode >= 0xb0 && startcode <= 0xbf) {
513 /* MLP/TrueHD audio has a 4-byte header */
514 avio_r8(s->pb);
515 len--;
516 }
517 }
518 }
519
520 /* now find stream */
521 for (i = 0; i < s->nb_streams; i++) {
522 st = s->streams[i];
523 if (st->id == startcode)
524 goto found;
525 }
526
527 es_type = m->psm_es_type[startcode & 0xff];
528 if (es_type == STREAM_TYPE_VIDEO_MPEG1) {
529 codec_id = AV_CODEC_ID_MPEG2VIDEO;
530 type = AVMEDIA_TYPE_VIDEO;
531 } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) {
532 codec_id = AV_CODEC_ID_MPEG2VIDEO;
533 type = AVMEDIA_TYPE_VIDEO;
534 } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 ||
535 es_type == STREAM_TYPE_AUDIO_MPEG2) {
536 codec_id = AV_CODEC_ID_MP3;
537 type = AVMEDIA_TYPE_AUDIO;
538 } else if (es_type == STREAM_TYPE_AUDIO_AAC) {
539 codec_id = AV_CODEC_ID_AAC;
540 type = AVMEDIA_TYPE_AUDIO;
541 } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) {
542 codec_id = AV_CODEC_ID_MPEG4;
543 type = AVMEDIA_TYPE_VIDEO;
544 } else if (es_type == STREAM_TYPE_VIDEO_H264) {
545 codec_id = AV_CODEC_ID_H264;
546 type = AVMEDIA_TYPE_VIDEO;
547 } else if (es_type == STREAM_TYPE_VIDEO_HEVC) {
548 codec_id = AV_CODEC_ID_HEVC;
549 type = AVMEDIA_TYPE_VIDEO;
550 } else if (es_type == STREAM_TYPE_AUDIO_AC3) {
551 codec_id = AV_CODEC_ID_AC3;
552 type = AVMEDIA_TYPE_AUDIO;
553 } else if (m->imkh_cctv && es_type == 0x91) {
554 codec_id = AV_CODEC_ID_PCM_MULAW;
555 type = AVMEDIA_TYPE_AUDIO;
556 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
557 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
558 unsigned char buf[8];
559
560 avio_read(s->pb, buf, 8);
561 avio_seek(s->pb, -8, SEEK_CUR);
562 if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
563 codec_id = AV_CODEC_ID_CAVS;
564 else
565 request_probe= 1;
566 type = AVMEDIA_TYPE_VIDEO;
567 } else if (startcode == PRIVATE_STREAM_2) {
568 type = AVMEDIA_TYPE_DATA;
569 codec_id = AV_CODEC_ID_DVD_NAV;
570 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
571 type = AVMEDIA_TYPE_AUDIO;
572 if (m->sofdec > 0) {
573 codec_id = AV_CODEC_ID_ADPCM_ADX;
574 // Auto-detect AC-3
575 request_probe = 50;
576 } else if (m->imkh_cctv && startcode == 0x1c0 && len > 80) {
577 codec_id = AV_CODEC_ID_PCM_ALAW;
578 request_probe = 50;
579 } else {
580 codec_id = AV_CODEC_ID_MP2;
581 if (m->imkh_cctv)
582 request_probe = 25;
583 }
584 } else if (startcode >= 0x80 && startcode <= 0x87) {
585 type = AVMEDIA_TYPE_AUDIO;
586 codec_id = AV_CODEC_ID_AC3;
587 } else if ((startcode >= 0x88 && startcode <= 0x8f) ||
588 (startcode >= 0x98 && startcode <= 0x9f)) {
589 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
590 type = AVMEDIA_TYPE_AUDIO;
591 codec_id = AV_CODEC_ID_DTS;
592 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
593 type = AVMEDIA_TYPE_AUDIO;
594 if (lpcm_header_len >= 6 && startcode == 0xa1) {
595 codec_id = AV_CODEC_ID_MLP;
596 } else {
597 codec_id = AV_CODEC_ID_PCM_DVD;
598 }
599 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
600 type = AVMEDIA_TYPE_AUDIO;
601 codec_id = AV_CODEC_ID_TRUEHD;
602 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
603 /* Used for both AC-3 and E-AC-3 in EVOB files */
604 type = AVMEDIA_TYPE_AUDIO;
605 codec_id = AV_CODEC_ID_AC3;
606 } else if (startcode >= 0x20 && startcode <= 0x3f) {
607 type = AVMEDIA_TYPE_SUBTITLE;
608 codec_id = AV_CODEC_ID_DVD_SUBTITLE;
609 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
610 type = AVMEDIA_TYPE_VIDEO;
611 codec_id = AV_CODEC_ID_VC1;
612 } else {
613 skip:
614 /* skip packet */
615 avio_skip(s->pb, len);
616 goto redo;
617 }
618 /* no stream found: add a new stream */
619 st = avformat_new_stream(s, NULL);
620 if (!st)
621 goto skip;
622 st->id = startcode;
623 st->codecpar->codec_type = type;
624 st->codecpar->codec_id = codec_id;
625 if ( st->codecpar->codec_id == AV_CODEC_ID_PCM_MULAW
626 || st->codecpar->codec_id == AV_CODEC_ID_PCM_ALAW) {
627 st->codecpar->channels = 1;
628 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
629 st->codecpar->sample_rate = 8000;
630 }
631 st->request_probe = request_probe;
632 st->need_parsing = AVSTREAM_PARSE_FULL;
633
634 found:
635 if (st->discard >= AVDISCARD_ALL)
636 goto skip;
637 if (startcode >= 0xa0 && startcode <= 0xaf) {
638 if (st->codecpar->codec_id == AV_CODEC_ID_MLP) {
639 if (len < 6)
640 goto skip;
641 avio_skip(s->pb, 6);
642 len -=6;
643 }
644 }
645 ret = av_get_packet(s->pb, pkt, len);
646
647 pkt->pts = pts;
648 pkt->dts = dts;
649 pkt->pos = dummy_pos;
650 pkt->stream_index = st->index;
651
652 if (s->debug & FF_FDEBUG_TS)
653 av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
654 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
655 pkt->size);
656
657 return (ret < 0) ? ret : 0;
658 }
659
mpegps_read_dts(AVFormatContext * s,int stream_index,int64_t * ppos,int64_t pos_limit)660 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
661 int64_t *ppos, int64_t pos_limit)
662 {
663 int len, startcode;
664 int64_t pos, pts, dts;
665
666 pos = *ppos;
667 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
668 return AV_NOPTS_VALUE;
669
670 for (;;) {
671 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
672 if (len < 0) {
673 if (s->debug & FF_FDEBUG_TS)
674 av_log(s, AV_LOG_DEBUG, "none (ret=%d)\n", len);
675 return AV_NOPTS_VALUE;
676 }
677 if (startcode == s->streams[stream_index]->id &&
678 dts != AV_NOPTS_VALUE) {
679 break;
680 }
681 avio_skip(s->pb, len);
682 }
683 if (s->debug & FF_FDEBUG_TS)
684 av_log(s, AV_LOG_DEBUG, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
685 pos, dts, dts / 90000.0);
686 *ppos = pos;
687 return dts;
688 }
689
690 AVInputFormat ff_mpegps_demuxer = {
691 .name = "mpeg",
692 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
693 .priv_data_size = sizeof(MpegDemuxContext),
694 .read_probe = mpegps_probe,
695 .read_header = mpegps_read_header,
696 .read_packet = mpegps_read_packet,
697 .read_timestamp = mpegps_read_dts,
698 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
699 };
700
701 #if CONFIG_VOBSUB_DEMUXER
702
703 #define REF_STRING "# VobSub index file,"
704 #define MAX_LINE_SIZE 2048
705
vobsub_probe(AVProbeData * p)706 static int vobsub_probe(AVProbeData *p)
707 {
708 if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1))
709 return AVPROBE_SCORE_MAX;
710 return 0;
711 }
712
vobsub_read_header(AVFormatContext * s)713 static int vobsub_read_header(AVFormatContext *s)
714 {
715 int i, ret = 0, header_parsed = 0, langidx = 0;
716 MpegDemuxContext *vobsub = s->priv_data;
717 size_t fname_len;
718 char *header_str;
719 AVBPrint header;
720 int64_t delay = 0;
721 AVStream *st = NULL;
722 int stream_id = -1;
723 char id[64] = {0};
724 char alt[MAX_LINE_SIZE] = {0};
725 AVInputFormat *iformat;
726
727 if (!vobsub->sub_name) {
728 char *ext;
729 vobsub->sub_name = av_strdup(s->url);
730 if (!vobsub->sub_name) {
731 ret = AVERROR(ENOMEM);
732 goto end;
733 }
734
735 fname_len = strlen(vobsub->sub_name);
736 ext = vobsub->sub_name - 3 + fname_len;
737 if (fname_len < 4 || *(ext - 1) != '.') {
738 av_log(s, AV_LOG_ERROR, "The input index filename is too short "
739 "to guess the associated .SUB file\n");
740 ret = AVERROR_INVALIDDATA;
741 goto end;
742 }
743 memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3);
744 av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->url, vobsub->sub_name);
745 }
746
747 if (!(iformat = av_find_input_format("mpeg"))) {
748 ret = AVERROR_DEMUXER_NOT_FOUND;
749 goto end;
750 }
751
752 vobsub->sub_ctx = avformat_alloc_context();
753 if (!vobsub->sub_ctx) {
754 ret = AVERROR(ENOMEM);
755 goto end;
756 }
757
758 if ((ret = ff_copy_whiteblacklists(vobsub->sub_ctx, s)) < 0)
759 goto end;
760
761 ret = avformat_open_input(&vobsub->sub_ctx, vobsub->sub_name, iformat, NULL);
762 if (ret < 0) {
763 av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", vobsub->sub_name);
764 goto end;
765 }
766
767 av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
768 while (!avio_feof(s->pb)) {
769 char line[MAX_LINE_SIZE];
770 int len = ff_get_line(s->pb, line, sizeof(line));
771
772 if (!len)
773 break;
774
775 line[strcspn(line, "\r\n")] = 0;
776
777 if (!strncmp(line, "id:", 3)) {
778 if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) {
779 av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', "
780 "assuming 'id: und, index: 0'\n", line);
781 strcpy(id, "und");
782 stream_id = 0;
783 }
784
785 if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) {
786 av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n");
787 ret = AVERROR(EINVAL);
788 goto end;
789 }
790
791 header_parsed = 1;
792 alt[0] = '\0';
793 /* We do not create the stream immediately to avoid adding empty
794 * streams. See the following timestamp entry. */
795
796 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id);
797
798 } else if (!strncmp(line, "timestamp:", 10)) {
799 AVPacket *sub;
800 int hh, mm, ss, ms;
801 int64_t pos, timestamp;
802 const char *p = line + 10;
803
804 if (stream_id == -1) {
805 av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n");
806 ret = AVERROR_INVALIDDATA;
807 goto end;
808 }
809
810 if (!st || st->id != stream_id) {
811 st = avformat_new_stream(s, NULL);
812 if (!st) {
813 ret = AVERROR(ENOMEM);
814 goto end;
815 }
816 st->id = stream_id;
817 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
818 st->codecpar->codec_id = AV_CODEC_ID_DVD_SUBTITLE;
819 avpriv_set_pts_info(st, 64, 1, 1000);
820 av_dict_set(&st->metadata, "language", id, 0);
821 if (alt[0])
822 av_dict_set(&st->metadata, "title", alt, 0);
823 }
824
825 if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64,
826 &hh, &mm, &ss, &ms, &pos) != 5) {
827 av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', "
828 "abort parsing\n", line);
829 ret = AVERROR_INVALIDDATA;
830 goto end;
831 }
832 timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay;
833 timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base);
834
835 sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0);
836 if (!sub) {
837 ret = AVERROR(ENOMEM);
838 goto end;
839 }
840 sub->pos = pos;
841 sub->pts = timestamp;
842 sub->stream_index = s->nb_streams - 1;
843
844 } else if (!strncmp(line, "alt:", 4)) {
845 const char *p = line + 4;
846
847 while (*p == ' ')
848 p++;
849 av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p);
850 av_strlcpy(alt, p, sizeof(alt));
851 header_parsed = 1;
852
853 } else if (!strncmp(line, "delay:", 6)) {
854 int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0;
855 const char *p = line + 6;
856
857 while (*p == ' ')
858 p++;
859 if (*p == '-' || *p == '+') {
860 sign = *p == '-' ? -1 : 1;
861 p++;
862 }
863 sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms);
864 delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign;
865
866 } else if (!strncmp(line, "langidx:", 8)) {
867 const char *p = line + 8;
868
869 if (sscanf(p, "%d", &langidx) != 1)
870 av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n");
871
872 } else if (!header_parsed) {
873 if (line[0] && line[0] != '#')
874 av_bprintf(&header, "%s\n", line);
875 }
876 }
877
878 if (langidx < s->nb_streams)
879 s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT;
880
881 for (i = 0; i < s->nb_streams; i++) {
882 vobsub->q[i].sort = SUB_SORT_POS_TS;
883 vobsub->q[i].keep_duplicates = 1;
884 ff_subtitles_queue_finalize(s, &vobsub->q[i]);
885 }
886
887 if (!av_bprint_is_complete(&header)) {
888 av_bprint_finalize(&header, NULL);
889 ret = AVERROR(ENOMEM);
890 goto end;
891 }
892 av_bprint_finalize(&header, &header_str);
893 for (i = 0; i < s->nb_streams; i++) {
894 AVStream *sub_st = s->streams[i];
895 sub_st->codecpar->extradata = av_strdup(header_str);
896 sub_st->codecpar->extradata_size = header.len;
897 }
898 av_free(header_str);
899
900 end:
901 return ret;
902 }
903
vobsub_read_packet(AVFormatContext * s,AVPacket * pkt)904 static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
905 {
906 MpegDemuxContext *vobsub = s->priv_data;
907 FFDemuxSubtitlesQueue *q;
908 AVIOContext *pb = vobsub->sub_ctx->pb;
909 int ret, psize, total_read = 0, i;
910 AVPacket idx_pkt = { 0 };
911
912 int64_t min_ts = INT64_MAX;
913 int sid = 0;
914 for (i = 0; i < s->nb_streams; i++) {
915 FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
916 int64_t ts;
917 av_assert0(tmpq->nb_subs);
918 ts = tmpq->subs[tmpq->current_sub_idx].pts;
919 if (ts < min_ts) {
920 min_ts = ts;
921 sid = i;
922 }
923 }
924 q = &vobsub->q[sid];
925 ret = ff_subtitles_queue_read_packet(q, &idx_pkt);
926 if (ret < 0)
927 return ret;
928
929 /* compute maximum packet size using the next packet position. This is
930 * useful when the len in the header is non-sense */
931 if (q->current_sub_idx < q->nb_subs) {
932 psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos;
933 } else {
934 int64_t fsize = avio_size(pb);
935 psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos;
936 }
937
938 avio_seek(pb, idx_pkt.pos, SEEK_SET);
939
940 av_init_packet(pkt);
941 pkt->size = 0;
942 pkt->data = NULL;
943
944 do {
945 int n, to_read, startcode;
946 int64_t pts, dts;
947 int64_t old_pos = avio_tell(pb), new_pos;
948 int pkt_size;
949
950 ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts);
951 if (ret < 0) {
952 if (pkt->size) // raise packet even if incomplete
953 break;
954 goto fail;
955 }
956 to_read = ret & 0xffff;
957 new_pos = avio_tell(pb);
958 pkt_size = ret + (new_pos - old_pos);
959
960 /* this prevents reads above the current packet */
961 if (total_read + pkt_size > psize)
962 break;
963 total_read += pkt_size;
964
965 /* the current chunk doesn't match the stream index (unlikely) */
966 if ((startcode & 0x1f) != s->streams[idx_pkt.stream_index]->id)
967 break;
968
969 ret = av_grow_packet(pkt, to_read);
970 if (ret < 0)
971 goto fail;
972
973 n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read);
974 if (n < to_read)
975 pkt->size -= to_read - n;
976 } while (total_read < psize);
977
978 pkt->pts = pkt->dts = idx_pkt.pts;
979 pkt->pos = idx_pkt.pos;
980 pkt->stream_index = idx_pkt.stream_index;
981
982 av_packet_unref(&idx_pkt);
983 return 0;
984
985 fail:
986 av_packet_unref(pkt);
987 av_packet_unref(&idx_pkt);
988 return ret;
989 }
990
vobsub_read_seek(AVFormatContext * s,int stream_index,int64_t min_ts,int64_t ts,int64_t max_ts,int flags)991 static int vobsub_read_seek(AVFormatContext *s, int stream_index,
992 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
993 {
994 MpegDemuxContext *vobsub = s->priv_data;
995
996 /* Rescale requested timestamps based on the first stream (timebase is the
997 * same for all subtitles stream within a .idx/.sub). Rescaling is done just
998 * like in avformat_seek_file(). */
999 if (stream_index == -1 && s->nb_streams != 1) {
1000 int i, ret = 0;
1001 AVRational time_base = s->streams[0]->time_base;
1002 ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
1003 min_ts = av_rescale_rnd(min_ts, time_base.den,
1004 time_base.num * (int64_t)AV_TIME_BASE,
1005 AV_ROUND_UP | AV_ROUND_PASS_MINMAX);
1006 max_ts = av_rescale_rnd(max_ts, time_base.den,
1007 time_base.num * (int64_t)AV_TIME_BASE,
1008 AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX);
1009 for (i = 0; i < s->nb_streams; i++) {
1010 int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index,
1011 min_ts, ts, max_ts, flags);
1012 if (r < 0)
1013 ret = r;
1014 }
1015 return ret;
1016 }
1017
1018 if (stream_index == -1) // only 1 stream
1019 stream_index = 0;
1020 return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index,
1021 min_ts, ts, max_ts, flags);
1022 }
1023
vobsub_read_close(AVFormatContext * s)1024 static int vobsub_read_close(AVFormatContext *s)
1025 {
1026 int i;
1027 MpegDemuxContext *vobsub = s->priv_data;
1028
1029 for (i = 0; i < s->nb_streams; i++)
1030 ff_subtitles_queue_clean(&vobsub->q[i]);
1031 if (vobsub->sub_ctx)
1032 avformat_close_input(&vobsub->sub_ctx);
1033 return 0;
1034 }
1035
1036 static const AVOption options[] = {
1037 { "sub_name", "URI for .sub file", offsetof(MpegDemuxContext, sub_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, AV_OPT_FLAG_DECODING_PARAM },
1038 { NULL }
1039 };
1040
1041 static const AVClass vobsub_demuxer_class = {
1042 .class_name = "vobsub",
1043 .item_name = av_default_item_name,
1044 .option = options,
1045 .version = LIBAVUTIL_VERSION_INT,
1046 };
1047
1048 AVInputFormat ff_vobsub_demuxer = {
1049 .name = "vobsub",
1050 .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"),
1051 .priv_data_size = sizeof(MpegDemuxContext),
1052 .read_probe = vobsub_probe,
1053 .read_header = vobsub_read_header,
1054 .read_packet = vobsub_read_packet,
1055 .read_seek2 = vobsub_read_seek,
1056 .read_close = vobsub_read_close,
1057 .flags = AVFMT_SHOW_IDS,
1058 .extensions = "idx",
1059 .priv_class = &vobsub_demuxer_class,
1060 };
1061 #endif
1062