Use enum typers instead of int.
[libav.git] / libavformat / mpeg.c
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 "mpeg.h"
24
25 //#define DEBUG_SEEK
26
27 #undef NDEBUG
28 #include <assert.h>
29
30 /*********************************************/
31 /* demux code */
32
33 #define MAX_SYNC_SIZE 100000
34
35 static int check_pes(uint8_t *p, uint8_t *end){
36 int pes1;
37 int pes2= (p[3] & 0xC0) == 0x80
38 && (p[4] & 0xC0) != 0x40
39 &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
40
41 for(p+=3; p<end && *p == 0xFF; p++);
42 if((*p&0xC0) == 0x40) p+=2;
43 if((*p&0xF0) == 0x20){
44 pes1= p[0]&p[2]&p[4]&1;
45 p+=5;
46 }else if((*p&0xF0) == 0x30){
47 pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
48 p+=10;
49 }else
50 pes1 = *p == 0x0F;
51
52 return pes1||pes2;
53 }
54
55 static int mpegps_probe(AVProbeData *p)
56 {
57 uint32_t code= -1;
58 int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
59 int i;
60 int score=0;
61
62 for(i=0; i<p->buf_size; i++){
63 code = (code<<8) + p->buf[i];
64 if ((code & 0xffffff00) == 0x100) {
65 int pes= check_pes(p->buf+i, p->buf+p->buf_size);
66
67 if(code == SYSTEM_HEADER_START_CODE) sys++;
68 else if(code == PRIVATE_STREAM_1) priv1++;
69 else if(code == PACK_START_CODE) pspack++;
70 else if((code & 0xf0) == VIDEO_ID && pes) vid++;
71 else if((code & 0xe0) == AUDIO_ID && pes) audio++;
72
73 else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
74 else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
75 }
76 }
77
78 if(vid+audio > invalid) /* invalid VDR files nd short PES streams */
79 score= AVPROBE_SCORE_MAX/4;
80
81 //av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, p->buf_size);
82 if(sys>invalid && sys*9 <= pspack*10)
83 return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
84 if(priv1 + vid + audio > invalid && (priv1+vid+audio)*9 <= pspack*10)
85 return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
86 if((!!vid ^ !!audio) && (audio+vid > 1) && !sys && !pspack && p->buf_size>2048) /* PES stream */
87 return AVPROBE_SCORE_MAX/2+2;
88
89 //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
90 return score;
91 }
92
93
94 typedef struct MpegDemuxContext {
95 int32_t header_state;
96 unsigned char psm_es_type[256];
97 int sofdec;
98 } MpegDemuxContext;
99
100 static int mpegps_read_header(AVFormatContext *s,
101 AVFormatParameters *ap)
102 {
103 MpegDemuxContext *m = s->priv_data;
104 const char *sofdec = "Sofdec";
105 int v, i = 0;
106
107 m->header_state = 0xff;
108 s->ctx_flags |= AVFMTCTX_NOHEADER;
109
110 m->sofdec = -1;
111 do {
112 v = get_byte(s->pb);
113 m->header_state = m->header_state << 8 | v;
114 m->sofdec++;
115 } while (v == sofdec[i] && i++ < 6);
116
117 /* no need to do more */
118 return 0;
119 }
120
121 static int64_t get_pts(ByteIOContext *pb, int c)
122 {
123 uint8_t buf[5];
124
125 buf[0] = c<0 ? get_byte(pb) : c;
126 get_buffer(pb, buf+1, 4);
127
128 return ff_parse_pes_pts(buf);
129 }
130
131 static int find_next_start_code(ByteIOContext *pb, int *size_ptr,
132 int32_t *header_state)
133 {
134 unsigned int state, v;
135 int val, n;
136
137 state = *header_state;
138 n = *size_ptr;
139 while (n > 0) {
140 if (url_feof(pb))
141 break;
142 v = get_byte(pb);
143 n--;
144 if (state == 0x000001) {
145 state = ((state << 8) | v) & 0xffffff;
146 val = state;
147 goto found;
148 }
149 state = ((state << 8) | v) & 0xffffff;
150 }
151 val = -1;
152 found:
153 *header_state = state;
154 *size_ptr = n;
155 return val;
156 }
157
158 #if 0 /* unused, remove? */
159 /* XXX: optimize */
160 static int find_prev_start_code(ByteIOContext *pb, int *size_ptr)
161 {
162 int64_t pos, pos_start;
163 int max_size, start_code;
164
165 max_size = *size_ptr;
166 pos_start = url_ftell(pb);
167
168 /* in order to go faster, we fill the buffer */
169 pos = pos_start - 16386;
170 if (pos < 0)
171 pos = 0;
172 url_fseek(pb, pos, SEEK_SET);
173 get_byte(pb);
174
175 pos = pos_start;
176 for(;;) {
177 pos--;
178 if (pos < 0 || (pos_start - pos) >= max_size) {
179 start_code = -1;
180 goto the_end;
181 }
182 url_fseek(pb, pos, SEEK_SET);
183 start_code = get_be32(pb);
184 if ((start_code & 0xffffff00) == 0x100)
185 break;
186 }
187 the_end:
188 *size_ptr = pos_start - pos;
189 return start_code;
190 }
191 #endif
192
193 /**
194 * Extracts stream types from a program stream map
195 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
196 *
197 * @return number of bytes occupied by PSM in the bitstream
198 */
199 static long mpegps_psm_parse(MpegDemuxContext *m, ByteIOContext *pb)
200 {
201 int psm_length, ps_info_length, es_map_length;
202
203 psm_length = get_be16(pb);
204 get_byte(pb);
205 get_byte(pb);
206 ps_info_length = get_be16(pb);
207
208 /* skip program_stream_info */
209 url_fskip(pb, ps_info_length);
210 es_map_length = get_be16(pb);
211
212 /* at least one es available? */
213 while (es_map_length >= 4){
214 unsigned char type = get_byte(pb);
215 unsigned char es_id = get_byte(pb);
216 uint16_t es_info_length = get_be16(pb);
217 /* remember mapping from stream id to stream type */
218 m->psm_es_type[es_id] = type;
219 /* skip program_stream_info */
220 url_fskip(pb, es_info_length);
221 es_map_length -= 4 + es_info_length;
222 }
223 get_be32(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= url_ftell(s->pb);
239
240 error_redo:
241 url_fseek(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 = url_ftell(s->pb);
248 //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, url_ftell(s->pb));
249 if (startcode < 0)
250 return AVERROR(EIO);
251 if (startcode == PACK_START_CODE)
252 goto redo;
253 if (startcode == SYSTEM_HEADER_START_CODE)
254 goto redo;
255 if (startcode == PADDING_STREAM) {
256 url_fskip(s->pb, get_be16(s->pb));
257 goto redo;
258 }
259 if (startcode == PRIVATE_STREAM_2) {
260 len = get_be16(s->pb);
261 if (!m->sofdec) {
262 while (len-- >= 6) {
263 if (get_byte(s->pb) == 'S') {
264 uint8_t buf[5];
265 get_buffer(s->pb, buf, sizeof(buf));
266 m->sofdec = !memcmp(buf, "ofdec", 5);
267 len -= sizeof(buf);
268 break;
269 }
270 }
271 m->sofdec -= !m->sofdec;
272 }
273 url_fskip(s->pb, len);
274 goto redo;
275 }
276 if (startcode == PROGRAM_STREAM_MAP) {
277 mpegps_psm_parse(m, s->pb);
278 goto redo;
279 }
280
281 /* find matching stream */
282 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
283 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
284 (startcode == 0x1bd) || (startcode == 0x1fd)))
285 goto redo;
286 if (ppos) {
287 *ppos = url_ftell(s->pb) - 4;
288 }
289 len = get_be16(s->pb);
290 pts =
291 dts = AV_NOPTS_VALUE;
292 /* stuffing */
293 for(;;) {
294 if (len < 1)
295 goto error_redo;
296 c = get_byte(s->pb);
297 len--;
298 /* XXX: for mpeg1, should test only bit 7 */
299 if (c != 0xff)
300 break;
301 }
302 if ((c & 0xc0) == 0x40) {
303 /* buffer scale & size */
304 get_byte(s->pb);
305 c = get_byte(s->pb);
306 len -= 2;
307 }
308 if ((c & 0xe0) == 0x20) {
309 dts = pts = get_pts(s->pb, c);
310 len -= 4;
311 if (c & 0x10){
312 dts = get_pts(s->pb, -1);
313 len -= 5;
314 }
315 } else if ((c & 0xc0) == 0x80) {
316 /* mpeg 2 PES */
317 #if 0 /* some streams have this field set for no apparent reason */
318 if ((c & 0x30) != 0) {
319 /* Encrypted multiplex not handled */
320 goto redo;
321 }
322 #endif
323 flags = get_byte(s->pb);
324 header_len = get_byte(s->pb);
325 len -= 2;
326 if (header_len > len)
327 goto error_redo;
328 len -= header_len;
329 if (flags & 0x80) {
330 dts = pts = get_pts(s->pb, -1);
331 header_len -= 5;
332 if (flags & 0x40) {
333 dts = get_pts(s->pb, -1);
334 header_len -= 5;
335 }
336 }
337 if (flags & 0x3f && header_len == 0){
338 flags &= 0xC0;
339 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
340 }
341 if (flags & 0x01) { /* PES extension */
342 pes_ext = get_byte(s->pb);
343 header_len--;
344 /* Skip PES private data, program packet sequence counter and P-STD buffer */
345 skip = (pes_ext >> 4) & 0xb;
346 skip += skip & 0x9;
347 if (pes_ext & 0x40 || skip > header_len){
348 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
349 pes_ext=skip=0;
350 }
351 url_fskip(s->pb, skip);
352 header_len -= skip;
353
354 if (pes_ext & 0x01) { /* PES extension 2 */
355 ext2_len = get_byte(s->pb);
356 header_len--;
357 if ((ext2_len & 0x7f) > 0) {
358 id_ext = get_byte(s->pb);
359 if ((id_ext & 0x80) == 0)
360 startcode = ((startcode & 0xff) << 8) | id_ext;
361 header_len--;
362 }
363 }
364 }
365 if(header_len < 0)
366 goto error_redo;
367 url_fskip(s->pb, header_len);
368 }
369 else if( c!= 0xf )
370 goto redo;
371
372 if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
373 startcode = get_byte(s->pb);
374 len--;
375 if (startcode >= 0x80 && startcode <= 0xcf) {
376 /* audio: skip header */
377 get_byte(s->pb);
378 get_byte(s->pb);
379 get_byte(s->pb);
380 len -= 3;
381 if (startcode >= 0xb0 && startcode <= 0xbf) {
382 /* MLP/TrueHD audio has a 4-byte header */
383 get_byte(s->pb);
384 len--;
385 }
386 }
387 }
388 if(len<0)
389 goto error_redo;
390 if(dts != AV_NOPTS_VALUE && ppos){
391 int i;
392 for(i=0; i<s->nb_streams; i++){
393 if(startcode == s->streams[i]->id &&
394 !url_is_streamed(s->pb) /* index useless on streams anyway */) {
395 ff_reduce_index(s, i);
396 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
397 }
398 }
399 }
400
401 *pstart_code = startcode;
402 *ppts = pts;
403 *pdts = dts;
404 return len;
405 }
406
407 static int mpegps_read_packet(AVFormatContext *s,
408 AVPacket *pkt)
409 {
410 MpegDemuxContext *m = s->priv_data;
411 AVStream *st;
412 int len, startcode, i, es_type;
413 enum CodecID codec_id = CODEC_ID_NONE;
414 enum CodecType type;
415 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
416
417 redo:
418 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
419 if (len < 0)
420 return len;
421
422 /* now find stream */
423 for(i=0;i<s->nb_streams;i++) {
424 st = s->streams[i];
425 if (st->id == startcode)
426 goto found;
427 }
428
429 es_type = m->psm_es_type[startcode & 0xff];
430 if(es_type > 0){
431 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
432 codec_id = CODEC_ID_MPEG2VIDEO;
433 type = CODEC_TYPE_VIDEO;
434 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
435 codec_id = CODEC_ID_MPEG2VIDEO;
436 type = CODEC_TYPE_VIDEO;
437 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
438 es_type == STREAM_TYPE_AUDIO_MPEG2){
439 codec_id = CODEC_ID_MP3;
440 type = CODEC_TYPE_AUDIO;
441 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
442 codec_id = CODEC_ID_AAC;
443 type = CODEC_TYPE_AUDIO;
444 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
445 codec_id = CODEC_ID_MPEG4;
446 type = CODEC_TYPE_VIDEO;
447 } else if(es_type == STREAM_TYPE_VIDEO_H264){
448 codec_id = CODEC_ID_H264;
449 type = CODEC_TYPE_VIDEO;
450 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
451 codec_id = CODEC_ID_AC3;
452 type = CODEC_TYPE_AUDIO;
453 } else {
454 goto skip;
455 }
456 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
457 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
458 unsigned char buf[8];
459 get_buffer(s->pb, buf, 8);
460 url_fseek(s->pb, -8, SEEK_CUR);
461 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
462 codec_id = CODEC_ID_CAVS;
463 else
464 codec_id = CODEC_ID_PROBE;
465 type = CODEC_TYPE_VIDEO;
466 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
467 type = CODEC_TYPE_AUDIO;
468 codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
469 } else if (startcode >= 0x80 && startcode <= 0x87) {
470 type = CODEC_TYPE_AUDIO;
471 codec_id = CODEC_ID_AC3;
472 } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
473 ||( startcode >= 0x98 && startcode <= 0x9f)) {
474 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
475 type = CODEC_TYPE_AUDIO;
476 codec_id = CODEC_ID_DTS;
477 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
478 type = CODEC_TYPE_AUDIO;
479 /* 16 bit form will be handled as CODEC_ID_PCM_S16BE */
480 codec_id = CODEC_ID_PCM_DVD;
481 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
482 type = CODEC_TYPE_AUDIO;
483 codec_id = CODEC_ID_MLP;
484 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
485 /* Used for both AC-3 and E-AC-3 in EVOB files */
486 type = CODEC_TYPE_AUDIO;
487 codec_id = CODEC_ID_AC3;
488 } else if (startcode >= 0x20 && startcode <= 0x3f) {
489 type = CODEC_TYPE_SUBTITLE;
490 codec_id = CODEC_ID_DVD_SUBTITLE;
491 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
492 type = CODEC_TYPE_VIDEO;
493 codec_id = CODEC_ID_VC1;
494 } else {
495 skip:
496 /* skip packet */
497 url_fskip(s->pb, len);
498 goto redo;
499 }
500 /* no stream found: add a new stream */
501 st = av_new_stream(s, startcode);
502 if (!st)
503 goto skip;
504 st->codec->codec_type = type;
505 st->codec->codec_id = codec_id;
506 if (codec_id != CODEC_ID_PCM_S16BE)
507 st->need_parsing = AVSTREAM_PARSE_FULL;
508 found:
509 if(st->discard >= AVDISCARD_ALL)
510 goto skip;
511 if (startcode >= 0xa0 && startcode <= 0xaf) {
512 int b1, freq;
513
514 /* for LPCM, we just skip the header and consider it is raw
515 audio data */
516 if (len <= 3)
517 goto skip;
518 get_byte(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
519 b1 = get_byte(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
520 get_byte(s->pb); /* dynamic range control (0x80 = off) */
521 len -= 3;
522 freq = (b1 >> 4) & 3;
523 st->codec->sample_rate = lpcm_freq_tab[freq];
524 st->codec->channels = 1 + (b1 & 7);
525 st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4;
526 st->codec->bit_rate = st->codec->channels *
527 st->codec->sample_rate *
528 st->codec->bits_per_coded_sample;
529 if (st->codec->bits_per_coded_sample == 16)
530 st->codec->codec_id = CODEC_ID_PCM_S16BE;
531 else if (st->codec->bits_per_coded_sample == 28)
532 return AVERROR(EINVAL);
533 }
534 av_new_packet(pkt, len);
535 get_buffer(s->pb, pkt->data, pkt->size);
536 pkt->pts = pts;
537 pkt->dts = dts;
538 pkt->stream_index = st->index;
539 #if 0
540 av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
541 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size);
542 #endif
543
544 return 0;
545 }
546
547 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
548 int64_t *ppos, int64_t pos_limit)
549 {
550 int len, startcode;
551 int64_t pos, pts, dts;
552
553 pos = *ppos;
554 #ifdef DEBUG_SEEK
555 printf("read_dts: pos=0x%"PRIx64" next=%d -> ", pos, find_next);
556 #endif
557 if (url_fseek(s->pb, pos, SEEK_SET) < 0)
558 return AV_NOPTS_VALUE;
559
560 for(;;) {
561 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
562 if (len < 0) {
563 #ifdef DEBUG_SEEK
564 printf("none (ret=%d)\n", len);
565 #endif
566 return AV_NOPTS_VALUE;
567 }
568 if (startcode == s->streams[stream_index]->id &&
569 dts != AV_NOPTS_VALUE) {
570 break;
571 }
572 url_fskip(s->pb, len);
573 }
574 #ifdef DEBUG_SEEK
575 printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0);
576 #endif
577 *ppos = pos;
578 return dts;
579 }
580
581 AVInputFormat mpegps_demuxer = {
582 "mpeg",
583 NULL_IF_CONFIG_SMALL("MPEG-PS format"),
584 sizeof(MpegDemuxContext),
585 mpegps_probe,
586 mpegps_read_header,
587 mpegps_read_packet,
588 NULL,
589 NULL, //mpegps_read_seek,
590 mpegps_read_dts,
591 .flags = AVFMT_SHOW_IDS|AVFMT_TS_DISCONT,
592 };