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2ba45a60 DM |
1 | /* |
2 | * MPEG1/2 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 "internal.h" | |
24 | #include "mpeg.h" | |
25 | ||
26 | #if CONFIG_VOBSUB_DEMUXER | |
27 | # include "subtitles.h" | |
28 | # include "libavutil/bprint.h" | |
29 | #endif | |
30 | ||
31 | #undef NDEBUG | |
32 | #include <assert.h> | |
33 | #include "libavutil/avassert.h" | |
34 | ||
35 | /*********************************************/ | |
36 | /* demux code */ | |
37 | ||
38 | #define MAX_SYNC_SIZE 100000 | |
39 | ||
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 | ||
62 | static int check_pack_header(const uint8_t *buf) | |
63 | { | |
64 | return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20; | |
65 | } | |
66 | ||
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 | ||
74 | for (i = 0; i < p->buf_size; i++) { | |
75 | code = (code << 8) + p->buf[i]; | |
76 | if ((code & 0xffffff00) == 0x100) { | |
77 | int len = p->buf[i + 1] << 8 | p->buf[i + 2]; | |
78 | int pes = check_pes(p->buf + i, p->buf + p->buf_size); | |
79 | int pack = check_pack_header(p->buf + i); | |
80 | ||
81 | if (code == SYSTEM_HEADER_START_CODE) | |
82 | sys++; | |
83 | else if (code == PACK_START_CODE && pack) | |
84 | pspack++; | |
85 | else if ((code & 0xf0) == VIDEO_ID && pes) | |
86 | vid++; | |
87 | // skip pes payload to avoid start code emulation for private | |
88 | // and audio streams | |
89 | else if ((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;} | |
90 | else if (code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;} | |
91 | else if (code == 0x1fd && pes) vid++; //VC1 | |
92 | ||
93 | else if ((code & 0xf0) == VIDEO_ID && !pes) invalid++; | |
94 | else if ((code & 0xe0) == AUDIO_ID && !pes) invalid++; | |
95 | else if (code == PRIVATE_STREAM_1 && !pes) invalid++; | |
96 | } | |
97 | } | |
98 | ||
99 | if (vid + audio > invalid + 1) /* invalid VDR files nd short PES streams */ | |
100 | score = AVPROBE_SCORE_EXTENSION / 2; | |
101 | ||
102 | if (sys > invalid && sys * 9 <= pspack * 10) | |
103 | return (audio > 12 || vid > 3 || pspack > 2) ? AVPROBE_SCORE_EXTENSION + 2 | |
104 | : AVPROBE_SCORE_EXTENSION / 2 + 1; // 1 more than mp3 | |
105 | if (pspack > invalid && (priv1 + vid + audio) * 10 >= pspack * 9) | |
106 | return pspack > 2 ? AVPROBE_SCORE_EXTENSION + 2 | |
107 | : AVPROBE_SCORE_EXTENSION / 2; // 1 more than .mpg | |
108 | if ((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && | |
109 | !pspack && p->buf_size > 2048 && vid + audio > invalid) /* PES stream */ | |
110 | return (audio > 12 || vid > 3 + 2 * invalid) ? AVPROBE_SCORE_EXTENSION + 2 | |
111 | : AVPROBE_SCORE_EXTENSION / 2; | |
112 | ||
113 | // 02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1 | |
114 | // mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6 | |
115 | // Have\ Yourself\ a\ Merry\ Little\ Christmas.mp3 0 0 0 5 0 1 len:21618 | |
116 | return score; | |
117 | } | |
118 | ||
119 | typedef struct MpegDemuxContext { | |
120 | int32_t header_state; | |
121 | unsigned char psm_es_type[256]; | |
122 | int sofdec; | |
123 | int dvd; | |
124 | int imkh_cctv; | |
125 | #if CONFIG_VOBSUB_DEMUXER | |
126 | AVFormatContext *sub_ctx; | |
127 | FFDemuxSubtitlesQueue q[32]; | |
128 | #endif | |
129 | } MpegDemuxContext; | |
130 | ||
131 | static int mpegps_read_header(AVFormatContext *s) | |
132 | { | |
133 | MpegDemuxContext *m = s->priv_data; | |
134 | char buffer[7]; | |
135 | int64_t last_pos = avio_tell(s->pb); | |
136 | ||
137 | m->header_state = 0xff; | |
138 | s->ctx_flags |= AVFMTCTX_NOHEADER; | |
139 | ||
140 | avio_get_str(s->pb, 6, buffer, sizeof(buffer)); | |
141 | if (!memcmp("IMKH", buffer, 4)) { | |
142 | m->imkh_cctv = 1; | |
143 | } else if (!memcmp("Sofdec", buffer, 6)) { | |
144 | m->sofdec = 1; | |
145 | } else | |
146 | avio_seek(s->pb, last_pos, SEEK_SET); | |
147 | ||
148 | /* no need to do more */ | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int64_t get_pts(AVIOContext *pb, int c) | |
153 | { | |
154 | uint8_t buf[5]; | |
155 | ||
156 | buf[0] = c < 0 ? avio_r8(pb) : c; | |
157 | avio_read(pb, buf + 1, 4); | |
158 | ||
159 | return ff_parse_pes_pts(buf); | |
160 | } | |
161 | ||
162 | static int find_next_start_code(AVIOContext *pb, int *size_ptr, | |
163 | int32_t *header_state) | |
164 | { | |
165 | unsigned int state, v; | |
166 | int val, n; | |
167 | ||
168 | state = *header_state; | |
169 | n = *size_ptr; | |
170 | while (n > 0) { | |
171 | if (avio_feof(pb)) | |
172 | break; | |
173 | v = avio_r8(pb); | |
174 | n--; | |
175 | if (state == 0x000001) { | |
176 | state = ((state << 8) | v) & 0xffffff; | |
177 | val = state; | |
178 | goto found; | |
179 | } | |
180 | state = ((state << 8) | v) & 0xffffff; | |
181 | } | |
182 | val = -1; | |
183 | ||
184 | found: | |
185 | *header_state = state; | |
186 | *size_ptr = n; | |
187 | return val; | |
188 | } | |
189 | ||
190 | /** | |
191 | * Extract stream types from a program stream map | |
192 | * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35 | |
193 | * | |
194 | * @return number of bytes occupied by PSM in the bitstream | |
195 | */ | |
196 | static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb) | |
197 | { | |
198 | int psm_length, ps_info_length, es_map_length; | |
199 | ||
200 | psm_length = avio_rb16(pb); | |
201 | avio_r8(pb); | |
202 | avio_r8(pb); | |
203 | ps_info_length = avio_rb16(pb); | |
204 | ||
205 | /* skip program_stream_info */ | |
206 | avio_skip(pb, ps_info_length); | |
207 | es_map_length = avio_rb16(pb); | |
208 | /* Ignore es_map_length, trust psm_length */ | |
209 | es_map_length = psm_length - ps_info_length - 10; | |
210 | ||
211 | /* at least one es available? */ | |
212 | while (es_map_length >= 4) { | |
213 | unsigned char type = avio_r8(pb); | |
214 | unsigned char es_id = avio_r8(pb); | |
215 | uint16_t es_info_length = avio_rb16(pb); | |
216 | ||
217 | /* remember mapping from stream id to stream type */ | |
218 | m->psm_es_type[es_id] = type; | |
219 | /* skip program_stream_info */ | |
220 | avio_skip(pb, es_info_length); | |
221 | es_map_length -= 4 + es_info_length; | |
222 | } | |
223 | avio_rb32(pb); /* crc32 */ | |
224 | return 2 + psm_length; | |
225 | } | |
226 | ||
227 | /* read the next PES header. Return its position in ppos | |
228 | * (if not NULL), and its start code, pts and dts. | |
229 | */ | |
230 | static int mpegps_read_pes_header(AVFormatContext *s, | |
231 | int64_t *ppos, int *pstart_code, | |
232 | int64_t *ppts, int64_t *pdts) | |
233 | { | |
234 | MpegDemuxContext *m = s->priv_data; | |
235 | int len, size, startcode, c, flags, header_len; | |
236 | int pes_ext, ext2_len, id_ext, skip; | |
237 | int64_t pts, dts; | |
238 | int64_t last_sync = avio_tell(s->pb); | |
239 | ||
240 | error_redo: | |
241 | avio_seek(s->pb, last_sync, SEEK_SET); | |
242 | redo: | |
243 | /* next start code (should be immediately after) */ | |
244 | m->header_state = 0xff; | |
245 | size = MAX_SYNC_SIZE; | |
246 | startcode = find_next_start_code(s->pb, &size, &m->header_state); | |
247 | last_sync = avio_tell(s->pb); | |
248 | if (startcode < 0) { | |
249 | if (avio_feof(s->pb)) | |
250 | return AVERROR_EOF; | |
251 | // FIXME we should remember header_state | |
252 | return AVERROR(EAGAIN); | |
253 | } | |
254 | ||
255 | if (startcode == PACK_START_CODE) | |
256 | goto redo; | |
257 | if (startcode == SYSTEM_HEADER_START_CODE) | |
258 | goto redo; | |
259 | if (startcode == PADDING_STREAM) { | |
260 | avio_skip(s->pb, avio_rb16(s->pb)); | |
261 | goto redo; | |
262 | } | |
263 | if (startcode == PRIVATE_STREAM_2) { | |
264 | if (!m->sofdec) { | |
265 | /* Need to detect whether this from a DVD or a 'Sofdec' stream */ | |
266 | int len = avio_rb16(s->pb); | |
267 | int bytesread = 0; | |
268 | uint8_t *ps2buf = av_malloc(len); | |
269 | ||
270 | if (ps2buf) { | |
271 | bytesread = avio_read(s->pb, ps2buf, len); | |
272 | ||
273 | if (bytesread != len) { | |
274 | avio_skip(s->pb, len - bytesread); | |
275 | } else { | |
276 | uint8_t *p = 0; | |
277 | if (len >= 6) | |
278 | p = memchr(ps2buf, 'S', len - 5); | |
279 | ||
280 | if (p) | |
281 | m->sofdec = !memcmp(p+1, "ofdec", 5); | |
282 | ||
283 | m->sofdec -= !m->sofdec; | |
284 | ||
285 | if (m->sofdec < 0) { | |
286 | if (len == 980 && ps2buf[0] == 0) { | |
287 | /* PCI structure? */ | |
288 | uint32_t startpts = AV_RB32(ps2buf + 0x0d); | |
289 | uint32_t endpts = AV_RB32(ps2buf + 0x11); | |
290 | uint8_t hours = ((ps2buf[0x19] >> 4) * 10) + (ps2buf[0x19] & 0x0f); | |
291 | uint8_t mins = ((ps2buf[0x1a] >> 4) * 10) + (ps2buf[0x1a] & 0x0f); | |
292 | uint8_t secs = ((ps2buf[0x1b] >> 4) * 10) + (ps2buf[0x1b] & 0x0f); | |
293 | ||
294 | m->dvd = (hours <= 23 && | |
295 | mins <= 59 && | |
296 | secs <= 59 && | |
297 | (ps2buf[0x19] & 0x0f) < 10 && | |
298 | (ps2buf[0x1a] & 0x0f) < 10 && | |
299 | (ps2buf[0x1b] & 0x0f) < 10 && | |
300 | endpts >= startpts); | |
301 | } else if (len == 1018 && ps2buf[0] == 1) { | |
302 | /* DSI structure? */ | |
303 | uint8_t hours = ((ps2buf[0x1d] >> 4) * 10) + (ps2buf[0x1d] & 0x0f); | |
304 | uint8_t mins = ((ps2buf[0x1e] >> 4) * 10) + (ps2buf[0x1e] & 0x0f); | |
305 | uint8_t secs = ((ps2buf[0x1f] >> 4) * 10) + (ps2buf[0x1f] & 0x0f); | |
306 | ||
307 | m->dvd = (hours <= 23 && | |
308 | mins <= 59 && | |
309 | secs <= 59 && | |
310 | (ps2buf[0x1d] & 0x0f) < 10 && | |
311 | (ps2buf[0x1e] & 0x0f) < 10 && | |
312 | (ps2buf[0x1f] & 0x0f) < 10); | |
313 | } | |
314 | } | |
315 | } | |
316 | ||
317 | av_free(ps2buf); | |
318 | ||
319 | /* If this isn't a DVD packet or no memory | |
320 | * could be allocated, just ignore it. | |
321 | * If we did, move back to the start of the | |
322 | * packet (plus 'length' field) */ | |
323 | if (!m->dvd || avio_skip(s->pb, -(len + 2)) < 0) { | |
324 | /* Skip back failed. | |
325 | * This packet will be lost but that can't be helped | |
326 | * if we can't skip back | |
327 | */ | |
328 | goto redo; | |
329 | } | |
330 | } else { | |
331 | /* No memory */ | |
332 | avio_skip(s->pb, len); | |
333 | goto redo; | |
334 | } | |
335 | } else if (!m->dvd) { | |
336 | int len = avio_rb16(s->pb); | |
337 | avio_skip(s->pb, len); | |
338 | goto redo; | |
339 | } | |
340 | } | |
341 | if (startcode == PROGRAM_STREAM_MAP) { | |
342 | mpegps_psm_parse(m, s->pb); | |
343 | goto redo; | |
344 | } | |
345 | ||
346 | /* find matching stream */ | |
347 | if (!((startcode >= 0x1c0 && startcode <= 0x1df) || | |
348 | (startcode >= 0x1e0 && startcode <= 0x1ef) || | |
349 | (startcode == 0x1bd) || | |
350 | (startcode == PRIVATE_STREAM_2) || | |
351 | (startcode == 0x1fd))) | |
352 | goto redo; | |
353 | if (ppos) { | |
354 | *ppos = avio_tell(s->pb) - 4; | |
355 | } | |
356 | len = avio_rb16(s->pb); | |
357 | pts = | |
358 | dts = AV_NOPTS_VALUE; | |
359 | if (startcode != PRIVATE_STREAM_2) | |
360 | { | |
361 | /* stuffing */ | |
362 | for (;;) { | |
363 | if (len < 1) | |
364 | goto error_redo; | |
365 | c = avio_r8(s->pb); | |
366 | len--; | |
367 | /* XXX: for mpeg1, should test only bit 7 */ | |
368 | if (c != 0xff) | |
369 | break; | |
370 | } | |
371 | if ((c & 0xc0) == 0x40) { | |
372 | /* buffer scale & size */ | |
373 | avio_r8(s->pb); | |
374 | c = avio_r8(s->pb); | |
375 | len -= 2; | |
376 | } | |
377 | if ((c & 0xe0) == 0x20) { | |
378 | dts = | |
379 | pts = get_pts(s->pb, c); | |
380 | len -= 4; | |
381 | if (c & 0x10) { | |
382 | dts = get_pts(s->pb, -1); | |
383 | len -= 5; | |
384 | } | |
385 | } else if ((c & 0xc0) == 0x80) { | |
386 | /* mpeg 2 PES */ | |
387 | flags = avio_r8(s->pb); | |
388 | header_len = avio_r8(s->pb); | |
389 | len -= 2; | |
390 | if (header_len > len) | |
391 | goto error_redo; | |
392 | len -= header_len; | |
393 | if (flags & 0x80) { | |
394 | dts = pts = get_pts(s->pb, -1); | |
395 | header_len -= 5; | |
396 | if (flags & 0x40) { | |
397 | dts = get_pts(s->pb, -1); | |
398 | header_len -= 5; | |
399 | } | |
400 | } | |
401 | if (flags & 0x3f && header_len == 0) { | |
402 | flags &= 0xC0; | |
403 | av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n"); | |
404 | } | |
405 | if (flags & 0x01) { /* PES extension */ | |
406 | pes_ext = avio_r8(s->pb); | |
407 | header_len--; | |
408 | /* Skip PES private data, program packet sequence counter | |
409 | * and P-STD buffer */ | |
410 | skip = (pes_ext >> 4) & 0xb; | |
411 | skip += skip & 0x9; | |
412 | if (pes_ext & 0x40 || skip > header_len) { | |
413 | av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext); | |
414 | pes_ext = skip = 0; | |
415 | } | |
416 | avio_skip(s->pb, skip); | |
417 | header_len -= skip; | |
418 | ||
419 | if (pes_ext & 0x01) { /* PES extension 2 */ | |
420 | ext2_len = avio_r8(s->pb); | |
421 | header_len--; | |
422 | if ((ext2_len & 0x7f) > 0) { | |
423 | id_ext = avio_r8(s->pb); | |
424 | if ((id_ext & 0x80) == 0) | |
425 | startcode = ((startcode & 0xff) << 8) | id_ext; | |
426 | header_len--; | |
427 | } | |
428 | } | |
429 | } | |
430 | if (header_len < 0) | |
431 | goto error_redo; | |
432 | avio_skip(s->pb, header_len); | |
433 | } else if (c != 0xf) | |
434 | goto redo; | |
435 | } | |
436 | ||
437 | if (startcode == PRIVATE_STREAM_1) { | |
438 | startcode = avio_r8(s->pb); | |
439 | len--; | |
440 | } | |
441 | if (len < 0) | |
442 | goto error_redo; | |
443 | if (dts != AV_NOPTS_VALUE && ppos) { | |
444 | int i; | |
445 | for (i = 0; i < s->nb_streams; i++) { | |
446 | if (startcode == s->streams[i]->id && | |
447 | s->pb->seekable /* index useless on streams anyway */) { | |
448 | ff_reduce_index(s, i); | |
449 | av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, | |
450 | AVINDEX_KEYFRAME /* FIXME keyframe? */); | |
451 | } | |
452 | } | |
453 | } | |
454 | ||
455 | *pstart_code = startcode; | |
456 | *ppts = pts; | |
457 | *pdts = dts; | |
458 | return len; | |
459 | } | |
460 | ||
461 | static int mpegps_read_packet(AVFormatContext *s, | |
462 | AVPacket *pkt) | |
463 | { | |
464 | MpegDemuxContext *m = s->priv_data; | |
465 | AVStream *st; | |
466 | int len, startcode, i, es_type, ret; | |
467 | int lpcm_header_len = -1; //Init to suppress warning | |
468 | int request_probe= 0; | |
469 | enum AVCodecID codec_id = AV_CODEC_ID_NONE; | |
470 | enum AVMediaType type; | |
471 | int64_t pts, dts, dummy_pos; // dummy_pos is needed for the index building to work | |
472 | ||
473 | redo: | |
474 | len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts); | |
475 | if (len < 0) | |
476 | return len; | |
477 | ||
478 | if (startcode >= 0x80 && startcode <= 0xcf) { | |
479 | if (len < 4) | |
480 | goto skip; | |
481 | ||
482 | /* audio: skip header */ | |
483 | avio_r8(s->pb); | |
484 | lpcm_header_len = avio_rb16(s->pb); | |
485 | len -= 3; | |
486 | if (startcode >= 0xb0 && startcode <= 0xbf) { | |
487 | /* MLP/TrueHD audio has a 4-byte header */ | |
488 | avio_r8(s->pb); | |
489 | len--; | |
490 | } | |
491 | } | |
492 | ||
493 | /* now find stream */ | |
494 | for (i = 0; i < s->nb_streams; i++) { | |
495 | st = s->streams[i]; | |
496 | if (st->id == startcode) | |
497 | goto found; | |
498 | } | |
499 | ||
500 | es_type = m->psm_es_type[startcode & 0xff]; | |
501 | if (es_type == STREAM_TYPE_VIDEO_MPEG1) { | |
502 | codec_id = AV_CODEC_ID_MPEG2VIDEO; | |
503 | type = AVMEDIA_TYPE_VIDEO; | |
504 | } else if (es_type == STREAM_TYPE_VIDEO_MPEG2) { | |
505 | codec_id = AV_CODEC_ID_MPEG2VIDEO; | |
506 | type = AVMEDIA_TYPE_VIDEO; | |
507 | } else if (es_type == STREAM_TYPE_AUDIO_MPEG1 || | |
508 | es_type == STREAM_TYPE_AUDIO_MPEG2) { | |
509 | codec_id = AV_CODEC_ID_MP3; | |
510 | type = AVMEDIA_TYPE_AUDIO; | |
511 | } else if (es_type == STREAM_TYPE_AUDIO_AAC) { | |
512 | codec_id = AV_CODEC_ID_AAC; | |
513 | type = AVMEDIA_TYPE_AUDIO; | |
514 | } else if (es_type == STREAM_TYPE_VIDEO_MPEG4) { | |
515 | codec_id = AV_CODEC_ID_MPEG4; | |
516 | type = AVMEDIA_TYPE_VIDEO; | |
517 | } else if (es_type == STREAM_TYPE_VIDEO_H264) { | |
518 | codec_id = AV_CODEC_ID_H264; | |
519 | type = AVMEDIA_TYPE_VIDEO; | |
520 | } else if (es_type == STREAM_TYPE_AUDIO_AC3) { | |
521 | codec_id = AV_CODEC_ID_AC3; | |
522 | type = AVMEDIA_TYPE_AUDIO; | |
523 | } else if (m->imkh_cctv && es_type == 0x91) { | |
524 | codec_id = AV_CODEC_ID_PCM_MULAW; | |
525 | type = AVMEDIA_TYPE_AUDIO; | |
526 | } else if (startcode >= 0x1e0 && startcode <= 0x1ef) { | |
527 | static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 }; | |
528 | unsigned char buf[8]; | |
529 | ||
530 | avio_read(s->pb, buf, 8); | |
531 | avio_seek(s->pb, -8, SEEK_CUR); | |
532 | if (!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1)) | |
533 | codec_id = AV_CODEC_ID_CAVS; | |
534 | else | |
535 | request_probe= 1; | |
536 | type = AVMEDIA_TYPE_VIDEO; | |
537 | } else if (startcode == PRIVATE_STREAM_2) { | |
538 | type = AVMEDIA_TYPE_DATA; | |
539 | codec_id = AV_CODEC_ID_DVD_NAV; | |
540 | } else if (startcode >= 0x1c0 && startcode <= 0x1df) { | |
541 | type = AVMEDIA_TYPE_AUDIO; | |
542 | if (m->sofdec > 0) { | |
543 | codec_id = AV_CODEC_ID_ADPCM_ADX; | |
544 | // Auto-detect AC-3 | |
545 | request_probe = 50; | |
546 | } else { | |
547 | codec_id = AV_CODEC_ID_MP2; | |
548 | } | |
549 | } else if (startcode >= 0x80 && startcode <= 0x87) { | |
550 | type = AVMEDIA_TYPE_AUDIO; | |
551 | codec_id = AV_CODEC_ID_AC3; | |
552 | } else if ((startcode >= 0x88 && startcode <= 0x8f) || | |
553 | (startcode >= 0x98 && startcode <= 0x9f)) { | |
554 | /* 0x90 - 0x97 is reserved for SDDS in DVD specs */ | |
555 | type = AVMEDIA_TYPE_AUDIO; | |
556 | codec_id = AV_CODEC_ID_DTS; | |
557 | } else if (startcode >= 0xa0 && startcode <= 0xaf) { | |
558 | type = AVMEDIA_TYPE_AUDIO; | |
559 | if (lpcm_header_len == 6) { | |
560 | codec_id = AV_CODEC_ID_MLP; | |
561 | } else { | |
562 | codec_id = AV_CODEC_ID_PCM_DVD; | |
563 | } | |
564 | } else if (startcode >= 0xb0 && startcode <= 0xbf) { | |
565 | type = AVMEDIA_TYPE_AUDIO; | |
566 | codec_id = AV_CODEC_ID_TRUEHD; | |
567 | } else if (startcode >= 0xc0 && startcode <= 0xcf) { | |
568 | /* Used for both AC-3 and E-AC-3 in EVOB files */ | |
569 | type = AVMEDIA_TYPE_AUDIO; | |
570 | codec_id = AV_CODEC_ID_AC3; | |
571 | } else if (startcode >= 0x20 && startcode <= 0x3f) { | |
572 | type = AVMEDIA_TYPE_SUBTITLE; | |
573 | codec_id = AV_CODEC_ID_DVD_SUBTITLE; | |
574 | } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) { | |
575 | type = AVMEDIA_TYPE_VIDEO; | |
576 | codec_id = AV_CODEC_ID_VC1; | |
577 | } else { | |
578 | skip: | |
579 | /* skip packet */ | |
580 | avio_skip(s->pb, len); | |
581 | goto redo; | |
582 | } | |
583 | /* no stream found: add a new stream */ | |
584 | st = avformat_new_stream(s, NULL); | |
585 | if (!st) | |
586 | goto skip; | |
587 | st->id = startcode; | |
588 | st->codec->codec_type = type; | |
589 | st->codec->codec_id = codec_id; | |
590 | if (st->codec->codec_id == AV_CODEC_ID_PCM_MULAW) { | |
591 | st->codec->channels = 1; | |
592 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
593 | st->codec->sample_rate = 8000; | |
594 | } | |
595 | st->request_probe = request_probe; | |
596 | st->need_parsing = AVSTREAM_PARSE_FULL; | |
597 | ||
598 | found: | |
599 | if (st->discard >= AVDISCARD_ALL) | |
600 | goto skip; | |
601 | if (startcode >= 0xa0 && startcode <= 0xaf) { | |
602 | if (lpcm_header_len == 6 && st->codec->codec_id == AV_CODEC_ID_MLP) { | |
603 | if (len < 6) | |
604 | goto skip; | |
605 | avio_skip(s->pb, 6); | |
606 | len -=6; | |
607 | } | |
608 | } | |
609 | ret = av_get_packet(s->pb, pkt, len); | |
610 | ||
611 | pkt->pts = pts; | |
612 | pkt->dts = dts; | |
613 | pkt->pos = dummy_pos; | |
614 | pkt->stream_index = st->index; | |
615 | av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n", | |
616 | pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, | |
617 | pkt->size); | |
618 | ||
619 | return (ret < 0) ? ret : 0; | |
620 | } | |
621 | ||
622 | static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index, | |
623 | int64_t *ppos, int64_t pos_limit) | |
624 | { | |
625 | int len, startcode; | |
626 | int64_t pos, pts, dts; | |
627 | ||
628 | pos = *ppos; | |
629 | if (avio_seek(s->pb, pos, SEEK_SET) < 0) | |
630 | return AV_NOPTS_VALUE; | |
631 | ||
632 | for (;;) { | |
633 | len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts); | |
634 | if (len < 0) { | |
635 | av_dlog(s, "none (ret=%d)\n", len); | |
636 | return AV_NOPTS_VALUE; | |
637 | } | |
638 | if (startcode == s->streams[stream_index]->id && | |
639 | dts != AV_NOPTS_VALUE) { | |
640 | break; | |
641 | } | |
642 | avio_skip(s->pb, len); | |
643 | } | |
644 | av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", | |
645 | pos, dts, dts / 90000.0); | |
646 | *ppos = pos; | |
647 | return dts; | |
648 | } | |
649 | ||
650 | AVInputFormat ff_mpegps_demuxer = { | |
651 | .name = "mpeg", | |
652 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"), | |
653 | .priv_data_size = sizeof(MpegDemuxContext), | |
654 | .read_probe = mpegps_probe, | |
655 | .read_header = mpegps_read_header, | |
656 | .read_packet = mpegps_read_packet, | |
657 | .read_timestamp = mpegps_read_dts, | |
658 | .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT, | |
659 | }; | |
660 | ||
661 | #if CONFIG_VOBSUB_DEMUXER | |
662 | ||
663 | #define REF_STRING "# VobSub index file," | |
664 | #define MAX_LINE_SIZE 2048 | |
665 | ||
666 | static int vobsub_probe(AVProbeData *p) | |
667 | { | |
668 | if (!strncmp(p->buf, REF_STRING, sizeof(REF_STRING) - 1)) | |
669 | return AVPROBE_SCORE_MAX; | |
670 | return 0; | |
671 | } | |
672 | ||
673 | static int vobsub_read_header(AVFormatContext *s) | |
674 | { | |
675 | int i, ret = 0, header_parsed = 0, langidx = 0; | |
676 | MpegDemuxContext *vobsub = s->priv_data; | |
677 | char *sub_name = NULL; | |
678 | size_t fname_len; | |
679 | char *ext, *header_str; | |
680 | AVBPrint header; | |
681 | int64_t delay = 0; | |
682 | AVStream *st = NULL; | |
683 | int stream_id = -1; | |
684 | char id[64] = {0}; | |
685 | char alt[MAX_LINE_SIZE] = {0}; | |
f6fa7814 | 686 | AVInputFormat *iformat; |
2ba45a60 DM |
687 | |
688 | sub_name = av_strdup(s->filename); | |
689 | fname_len = strlen(sub_name); | |
690 | ext = sub_name - 3 + fname_len; | |
691 | if (fname_len < 4 || *(ext - 1) != '.') { | |
692 | av_log(s, AV_LOG_ERROR, "The input index filename is too short " | |
693 | "to guess the associated .SUB file\n"); | |
694 | ret = AVERROR_INVALIDDATA; | |
695 | goto end; | |
696 | } | |
697 | memcpy(ext, !strncmp(ext, "IDX", 3) ? "SUB" : "sub", 3); | |
698 | av_log(s, AV_LOG_VERBOSE, "IDX/SUB: %s -> %s\n", s->filename, sub_name); | |
f6fa7814 DM |
699 | |
700 | if (!(iformat = av_find_input_format("mpeg"))) { | |
701 | ret = AVERROR_DEMUXER_NOT_FOUND; | |
702 | goto end; | |
703 | } | |
704 | ||
705 | vobsub->sub_ctx = avformat_alloc_context(); | |
706 | if (!vobsub->sub_ctx) { | |
707 | ret = AVERROR(ENOMEM); | |
708 | goto end; | |
709 | } | |
710 | ||
711 | if ((ret = ff_copy_whitelists(vobsub->sub_ctx, s)) < 0) | |
712 | goto end; | |
713 | ||
714 | ret = avformat_open_input(&vobsub->sub_ctx, sub_name, iformat, NULL); | |
2ba45a60 DM |
715 | if (ret < 0) { |
716 | av_log(s, AV_LOG_ERROR, "Unable to open %s as MPEG subtitles\n", sub_name); | |
717 | goto end; | |
718 | } | |
719 | ||
720 | av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED); | |
721 | while (!avio_feof(s->pb)) { | |
722 | char line[MAX_LINE_SIZE]; | |
723 | int len = ff_get_line(s->pb, line, sizeof(line)); | |
724 | ||
725 | if (!len) | |
726 | break; | |
727 | ||
728 | line[strcspn(line, "\r\n")] = 0; | |
729 | ||
730 | if (!strncmp(line, "id:", 3)) { | |
731 | if (sscanf(line, "id: %63[^,], index: %u", id, &stream_id) != 2) { | |
732 | av_log(s, AV_LOG_WARNING, "Unable to parse index line '%s', " | |
733 | "assuming 'id: und, index: 0'\n", line); | |
734 | strcpy(id, "und"); | |
735 | stream_id = 0; | |
736 | } | |
737 | ||
738 | if (stream_id >= FF_ARRAY_ELEMS(vobsub->q)) { | |
739 | av_log(s, AV_LOG_ERROR, "Maximum number of subtitles streams reached\n"); | |
740 | ret = AVERROR(EINVAL); | |
741 | goto end; | |
742 | } | |
743 | ||
744 | header_parsed = 1; | |
745 | alt[0] = '\0'; | |
746 | /* We do not create the stream immediately to avoid adding empty | |
747 | * streams. See the following timestamp entry. */ | |
748 | ||
749 | av_log(s, AV_LOG_DEBUG, "IDX stream[%d] id=%s\n", stream_id, id); | |
750 | ||
751 | } else if (!strncmp(line, "timestamp:", 10)) { | |
752 | AVPacket *sub; | |
753 | int hh, mm, ss, ms; | |
754 | int64_t pos, timestamp; | |
755 | const char *p = line + 10; | |
756 | ||
757 | if (stream_id == -1) { | |
758 | av_log(s, AV_LOG_ERROR, "Timestamp declared before any stream\n"); | |
759 | ret = AVERROR_INVALIDDATA; | |
760 | goto end; | |
761 | } | |
762 | ||
763 | if (!st || st->id != stream_id) { | |
764 | st = avformat_new_stream(s, NULL); | |
765 | if (!st) { | |
766 | ret = AVERROR(ENOMEM); | |
767 | goto end; | |
768 | } | |
769 | st->id = stream_id; | |
770 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
771 | st->codec->codec_id = AV_CODEC_ID_DVD_SUBTITLE; | |
772 | avpriv_set_pts_info(st, 64, 1, 1000); | |
773 | av_dict_set(&st->metadata, "language", id, 0); | |
774 | if (alt[0]) | |
775 | av_dict_set(&st->metadata, "title", alt, 0); | |
776 | } | |
777 | ||
778 | if (sscanf(p, "%02d:%02d:%02d:%03d, filepos: %"SCNx64, | |
779 | &hh, &mm, &ss, &ms, &pos) != 5) { | |
780 | av_log(s, AV_LOG_ERROR, "Unable to parse timestamp line '%s', " | |
781 | "abort parsing\n", line); | |
782 | ret = AVERROR_INVALIDDATA; | |
783 | goto end; | |
784 | } | |
785 | timestamp = (hh*3600LL + mm*60LL + ss) * 1000LL + ms + delay; | |
786 | timestamp = av_rescale_q(timestamp, av_make_q(1, 1000), st->time_base); | |
787 | ||
788 | sub = ff_subtitles_queue_insert(&vobsub->q[s->nb_streams - 1], "", 0, 0); | |
789 | if (!sub) { | |
790 | ret = AVERROR(ENOMEM); | |
791 | goto end; | |
792 | } | |
793 | sub->pos = pos; | |
794 | sub->pts = timestamp; | |
795 | sub->stream_index = s->nb_streams - 1; | |
796 | ||
797 | } else if (!strncmp(line, "alt:", 4)) { | |
798 | const char *p = line + 4; | |
799 | ||
800 | while (*p == ' ') | |
801 | p++; | |
802 | av_log(s, AV_LOG_DEBUG, "IDX stream[%d] name=%s\n", stream_id, p); | |
803 | av_strlcpy(alt, p, sizeof(alt)); | |
804 | header_parsed = 1; | |
805 | ||
806 | } else if (!strncmp(line, "delay:", 6)) { | |
807 | int sign = 1, hh = 0, mm = 0, ss = 0, ms = 0; | |
808 | const char *p = line + 6; | |
809 | ||
810 | while (*p == ' ') | |
811 | p++; | |
812 | if (*p == '-' || *p == '+') { | |
813 | sign = *p == '-' ? -1 : 1; | |
814 | p++; | |
815 | } | |
816 | sscanf(p, "%d:%d:%d:%d", &hh, &mm, &ss, &ms); | |
817 | delay = ((hh*3600LL + mm*60LL + ss) * 1000LL + ms) * sign; | |
818 | ||
819 | } else if (!strncmp(line, "langidx:", 8)) { | |
820 | const char *p = line + 8; | |
821 | ||
822 | if (sscanf(p, "%d", &langidx) != 1) | |
823 | av_log(s, AV_LOG_ERROR, "Invalid langidx specified\n"); | |
824 | ||
825 | } else if (!header_parsed) { | |
826 | if (line[0] && line[0] != '#') | |
827 | av_bprintf(&header, "%s\n", line); | |
828 | } | |
829 | } | |
830 | ||
831 | if (langidx < s->nb_streams) | |
832 | s->streams[langidx]->disposition |= AV_DISPOSITION_DEFAULT; | |
833 | ||
834 | for (i = 0; i < s->nb_streams; i++) { | |
835 | vobsub->q[i].sort = SUB_SORT_POS_TS; | |
836 | ff_subtitles_queue_finalize(&vobsub->q[i]); | |
837 | } | |
838 | ||
839 | if (!av_bprint_is_complete(&header)) { | |
840 | av_bprint_finalize(&header, NULL); | |
841 | ret = AVERROR(ENOMEM); | |
842 | goto end; | |
843 | } | |
844 | av_bprint_finalize(&header, &header_str); | |
845 | for (i = 0; i < s->nb_streams; i++) { | |
846 | AVStream *sub_st = s->streams[i]; | |
847 | sub_st->codec->extradata = av_strdup(header_str); | |
848 | sub_st->codec->extradata_size = header.len; | |
849 | } | |
850 | av_free(header_str); | |
851 | ||
852 | end: | |
853 | av_free(sub_name); | |
854 | return ret; | |
855 | } | |
856 | ||
857 | static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt) | |
858 | { | |
859 | MpegDemuxContext *vobsub = s->priv_data; | |
860 | FFDemuxSubtitlesQueue *q; | |
861 | AVIOContext *pb = vobsub->sub_ctx->pb; | |
862 | int ret, psize, total_read = 0, i; | |
863 | AVPacket idx_pkt; | |
864 | ||
865 | int64_t min_ts = INT64_MAX; | |
866 | int sid = 0; | |
867 | for (i = 0; i < s->nb_streams; i++) { | |
868 | FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i]; | |
869 | int64_t ts; | |
870 | av_assert0(tmpq->nb_subs); | |
871 | ts = tmpq->subs[tmpq->current_sub_idx].pts; | |
872 | if (ts < min_ts) { | |
873 | min_ts = ts; | |
874 | sid = i; | |
875 | } | |
876 | } | |
877 | q = &vobsub->q[sid]; | |
878 | ret = ff_subtitles_queue_read_packet(q, &idx_pkt); | |
879 | if (ret < 0) | |
880 | return ret; | |
881 | ||
882 | /* compute maximum packet size using the next packet position. This is | |
883 | * useful when the len in the header is non-sense */ | |
884 | if (q->current_sub_idx < q->nb_subs) { | |
885 | psize = q->subs[q->current_sub_idx].pos - idx_pkt.pos; | |
886 | } else { | |
887 | int64_t fsize = avio_size(pb); | |
888 | psize = fsize < 0 ? 0xffff : fsize - idx_pkt.pos; | |
889 | } | |
890 | ||
891 | avio_seek(pb, idx_pkt.pos, SEEK_SET); | |
892 | ||
893 | av_init_packet(pkt); | |
894 | pkt->size = 0; | |
895 | pkt->data = NULL; | |
896 | ||
897 | do { | |
898 | int n, to_read, startcode; | |
899 | int64_t pts, dts; | |
900 | int64_t old_pos = avio_tell(pb), new_pos; | |
901 | int pkt_size; | |
902 | ||
903 | ret = mpegps_read_pes_header(vobsub->sub_ctx, NULL, &startcode, &pts, &dts); | |
904 | if (ret < 0) { | |
905 | if (pkt->size) // raise packet even if incomplete | |
906 | break; | |
907 | goto fail; | |
908 | } | |
909 | to_read = ret & 0xffff; | |
910 | new_pos = avio_tell(pb); | |
911 | pkt_size = ret + (new_pos - old_pos); | |
912 | ||
913 | /* this prevents reads above the current packet */ | |
914 | if (total_read + pkt_size > psize) | |
915 | break; | |
916 | total_read += pkt_size; | |
917 | ||
918 | /* the current chunk doesn't match the stream index (unlikely) */ | |
919 | if ((startcode & 0x1f) != idx_pkt.stream_index) | |
920 | break; | |
921 | ||
922 | ret = av_grow_packet(pkt, to_read); | |
923 | if (ret < 0) | |
924 | goto fail; | |
925 | ||
926 | n = avio_read(pb, pkt->data + (pkt->size - to_read), to_read); | |
927 | if (n < to_read) | |
928 | pkt->size -= to_read - n; | |
929 | } while (total_read < psize); | |
930 | ||
931 | pkt->pts = pkt->dts = idx_pkt.pts; | |
932 | pkt->pos = idx_pkt.pos; | |
933 | pkt->stream_index = idx_pkt.stream_index; | |
934 | ||
935 | av_free_packet(&idx_pkt); | |
936 | return 0; | |
937 | ||
938 | fail: | |
939 | av_free_packet(pkt); | |
940 | av_free_packet(&idx_pkt); | |
941 | return ret; | |
942 | } | |
943 | ||
944 | static int vobsub_read_seek(AVFormatContext *s, int stream_index, | |
945 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) | |
946 | { | |
947 | MpegDemuxContext *vobsub = s->priv_data; | |
948 | ||
949 | /* Rescale requested timestamps based on the first stream (timebase is the | |
950 | * same for all subtitles stream within a .idx/.sub). Rescaling is done just | |
951 | * like in avformat_seek_file(). */ | |
952 | if (stream_index == -1 && s->nb_streams != 1) { | |
953 | int i, ret = 0; | |
954 | AVRational time_base = s->streams[0]->time_base; | |
955 | ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base); | |
956 | min_ts = av_rescale_rnd(min_ts, time_base.den, | |
957 | time_base.num * (int64_t)AV_TIME_BASE, | |
958 | AV_ROUND_UP | AV_ROUND_PASS_MINMAX); | |
959 | max_ts = av_rescale_rnd(max_ts, time_base.den, | |
960 | time_base.num * (int64_t)AV_TIME_BASE, | |
961 | AV_ROUND_DOWN | AV_ROUND_PASS_MINMAX); | |
962 | for (i = 0; i < s->nb_streams; i++) { | |
963 | int r = ff_subtitles_queue_seek(&vobsub->q[i], s, stream_index, | |
964 | min_ts, ts, max_ts, flags); | |
965 | if (r < 0) | |
966 | ret = r; | |
967 | } | |
968 | return ret; | |
969 | } | |
970 | ||
971 | if (stream_index == -1) // only 1 stream | |
972 | stream_index = 0; | |
973 | return ff_subtitles_queue_seek(&vobsub->q[stream_index], s, stream_index, | |
974 | min_ts, ts, max_ts, flags); | |
975 | } | |
976 | ||
977 | static int vobsub_read_close(AVFormatContext *s) | |
978 | { | |
979 | int i; | |
980 | MpegDemuxContext *vobsub = s->priv_data; | |
981 | ||
982 | for (i = 0; i < s->nb_streams; i++) | |
983 | ff_subtitles_queue_clean(&vobsub->q[i]); | |
984 | if (vobsub->sub_ctx) | |
985 | avformat_close_input(&vobsub->sub_ctx); | |
986 | return 0; | |
987 | } | |
988 | ||
989 | AVInputFormat ff_vobsub_demuxer = { | |
990 | .name = "vobsub", | |
991 | .long_name = NULL_IF_CONFIG_SMALL("VobSub subtitle format"), | |
992 | .priv_data_size = sizeof(MpegDemuxContext), | |
993 | .read_probe = vobsub_probe, | |
994 | .read_header = vobsub_read_header, | |
995 | .read_packet = vobsub_read_packet, | |
996 | .read_seek2 = vobsub_read_seek, | |
997 | .read_close = vobsub_read_close, | |
998 | .flags = AVFMT_SHOW_IDS, | |
999 | .extensions = "idx", | |
1000 | }; | |
1001 | #endif |