avformat: Remove non-compiling and/or silly commented-out printf/av_log statements
[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 Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "avformat.h"
23 #include "internal.h"
24 #include "mpeg.h"
25
26 #undef NDEBUG
27 #include <assert.h>
28
29 /*********************************************/
30 /* demux code */
31
32 #define MAX_SYNC_SIZE 100000
33
34 static int check_pes(uint8_t *p, uint8_t *end){
35 int pes1;
36 int pes2= (p[3] & 0xC0) == 0x80
37 && (p[4] & 0xC0) != 0x40
38 &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
39
40 for(p+=3; p<end && *p == 0xFF; p++);
41 if((*p&0xC0) == 0x40) p+=2;
42 if((*p&0xF0) == 0x20){
43 pes1= p[0]&p[2]&p[4]&1;
44 }else if((*p&0xF0) == 0x30){
45 pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
46 }else
47 pes1 = *p == 0x0F;
48
49 return pes1||pes2;
50 }
51
52 static int check_pack_header(const uint8_t *buf) {
53 return (buf[1] & 0xC0) == 0x40 || (buf[1] & 0xF0) == 0x20;
54 }
55
56 static int mpegps_probe(AVProbeData *p)
57 {
58 uint32_t code= -1;
59 int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
60 int i;
61 int score=0;
62
63 for(i=0; i<p->buf_size; i++){
64 code = (code<<8) + p->buf[i];
65 if ((code & 0xffffff00) == 0x100) {
66 int len= p->buf[i+1] << 8 | p->buf[i+2];
67 int pes= check_pes(p->buf+i, p->buf+p->buf_size);
68 int pack = check_pack_header(p->buf+i);
69
70 if(code == SYSTEM_HEADER_START_CODE) sys++;
71 else if(code == PACK_START_CODE && pack) pspack++;
72 else if((code & 0xf0) == VIDEO_ID && pes) vid++;
73 // skip pes payload to avoid start code emulation for private
74 // and audio streams
75 else if((code & 0xe0) == AUDIO_ID && pes) {audio++; i+=len;}
76 else if(code == PRIVATE_STREAM_1 && pes) {priv1++; i+=len;}
77
78 else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
79 else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
80 else if(code == PRIVATE_STREAM_1 && !pes) invalid++;
81 }
82 }
83
84 if(vid+audio > invalid) /* invalid VDR files nd short PES streams */
85 score= AVPROBE_SCORE_MAX/4;
86
87 if(sys>invalid && sys*9 <= pspack*10)
88 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
89 if(pspack > invalid && (priv1+vid+audio)*10 >= pspack*9)
90 return pspack > 2 ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4; // +1 for .mpg
91 if((!!vid ^ !!audio) && (audio > 4 || vid > 1) && !sys && !pspack && p->buf_size>2048 && vid + audio > invalid) /* PES stream */
92 return (audio > 12 || vid > 3) ? AVPROBE_SCORE_MAX/2+2 : AVPROBE_SCORE_MAX/4;
93
94 //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
95 //mp3_misidentified_2.mp3 has sys:0 priv1:0 pspack:0 vid:0 audio:6
96 return score;
97 }
98
99
100 typedef struct MpegDemuxContext {
101 int32_t header_state;
102 unsigned char psm_es_type[256];
103 int sofdec;
104 } MpegDemuxContext;
105
106 static int mpegps_read_header(AVFormatContext *s)
107 {
108 MpegDemuxContext *m = s->priv_data;
109 const char *sofdec = "Sofdec";
110 int v, i = 0;
111
112 m->header_state = 0xff;
113 s->ctx_flags |= AVFMTCTX_NOHEADER;
114
115 m->sofdec = -1;
116 do {
117 v = avio_r8(s->pb);
118 m->header_state = m->header_state << 8 | v;
119 m->sofdec++;
120 } while (v == sofdec[i] && i++ < 6);
121
122 m->sofdec = (m->sofdec == 6) ? 1 : 0;
123
124 /* no need to do more */
125 return 0;
126 }
127
128 static int64_t get_pts(AVIOContext *pb, int c)
129 {
130 uint8_t buf[5];
131
132 buf[0] = c<0 ? avio_r8(pb) : c;
133 avio_read(pb, buf+1, 4);
134
135 return ff_parse_pes_pts(buf);
136 }
137
138 static int find_next_start_code(AVIOContext *pb, int *size_ptr,
139 int32_t *header_state)
140 {
141 unsigned int state, v;
142 int val, n;
143
144 state = *header_state;
145 n = *size_ptr;
146 while (n > 0) {
147 if (pb->eof_reached)
148 break;
149 v = avio_r8(pb);
150 n--;
151 if (state == 0x000001) {
152 state = ((state << 8) | v) & 0xffffff;
153 val = state;
154 goto found;
155 }
156 state = ((state << 8) | v) & 0xffffff;
157 }
158 val = -1;
159 found:
160 *header_state = state;
161 *size_ptr = n;
162 return val;
163 }
164
165 /**
166 * Extract stream types from a program stream map
167 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
168 *
169 * @return number of bytes occupied by PSM in the bitstream
170 */
171 static long mpegps_psm_parse(MpegDemuxContext *m, AVIOContext *pb)
172 {
173 int psm_length, ps_info_length, es_map_length;
174
175 psm_length = avio_rb16(pb);
176 avio_r8(pb);
177 avio_r8(pb);
178 ps_info_length = avio_rb16(pb);
179
180 /* skip program_stream_info */
181 avio_skip(pb, ps_info_length);
182 es_map_length = avio_rb16(pb);
183
184 /* at least one es available? */
185 while (es_map_length >= 4){
186 unsigned char type = avio_r8(pb);
187 unsigned char es_id = avio_r8(pb);
188 uint16_t es_info_length = avio_rb16(pb);
189 /* remember mapping from stream id to stream type */
190 m->psm_es_type[es_id] = type;
191 /* skip program_stream_info */
192 avio_skip(pb, es_info_length);
193 es_map_length -= 4 + es_info_length;
194 }
195 avio_rb32(pb); /* crc32 */
196 return 2 + psm_length;
197 }
198
199 /* read the next PES header. Return its position in ppos
200 (if not NULL), and its start code, pts and dts.
201 */
202 static int mpegps_read_pes_header(AVFormatContext *s,
203 int64_t *ppos, int *pstart_code,
204 int64_t *ppts, int64_t *pdts)
205 {
206 MpegDemuxContext *m = s->priv_data;
207 int len, size, startcode, c, flags, header_len;
208 int pes_ext, ext2_len, id_ext, skip;
209 int64_t pts, dts;
210 int64_t last_sync= avio_tell(s->pb);
211
212 error_redo:
213 avio_seek(s->pb, last_sync, SEEK_SET);
214 redo:
215 /* next start code (should be immediately after) */
216 m->header_state = 0xff;
217 size = MAX_SYNC_SIZE;
218 startcode = find_next_start_code(s->pb, &size, &m->header_state);
219 last_sync = avio_tell(s->pb);
220 if (startcode < 0){
221 if(s->pb->eof_reached)
222 return AVERROR_EOF;
223 //FIXME we should remember header_state
224 return AVERROR(EAGAIN);
225 }
226
227 if (startcode == PACK_START_CODE)
228 goto redo;
229 if (startcode == SYSTEM_HEADER_START_CODE)
230 goto redo;
231 if (startcode == PADDING_STREAM) {
232 avio_skip(s->pb, avio_rb16(s->pb));
233 goto redo;
234 }
235 if (startcode == PRIVATE_STREAM_2) {
236 len = avio_rb16(s->pb);
237 if (!m->sofdec) {
238 while (len-- >= 6) {
239 if (avio_r8(s->pb) == 'S') {
240 uint8_t buf[5];
241 avio_read(s->pb, buf, sizeof(buf));
242 m->sofdec = !memcmp(buf, "ofdec", 5);
243 len -= sizeof(buf);
244 break;
245 }
246 }
247 m->sofdec -= !m->sofdec;
248 }
249 avio_skip(s->pb, len);
250 goto redo;
251 }
252 if (startcode == PROGRAM_STREAM_MAP) {
253 mpegps_psm_parse(m, s->pb);
254 goto redo;
255 }
256
257 /* find matching stream */
258 if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
259 (startcode >= 0x1e0 && startcode <= 0x1ef) ||
260 (startcode == 0x1bd) || (startcode == 0x1fd)))
261 goto redo;
262 if (ppos) {
263 *ppos = avio_tell(s->pb) - 4;
264 }
265 len = avio_rb16(s->pb);
266 pts =
267 dts = AV_NOPTS_VALUE;
268 /* stuffing */
269 for(;;) {
270 if (len < 1)
271 goto error_redo;
272 c = avio_r8(s->pb);
273 len--;
274 /* XXX: for mpeg1, should test only bit 7 */
275 if (c != 0xff)
276 break;
277 }
278 if ((c & 0xc0) == 0x40) {
279 /* buffer scale & size */
280 avio_r8(s->pb);
281 c = avio_r8(s->pb);
282 len -= 2;
283 }
284 if ((c & 0xe0) == 0x20) {
285 dts = pts = get_pts(s->pb, c);
286 len -= 4;
287 if (c & 0x10){
288 dts = get_pts(s->pb, -1);
289 len -= 5;
290 }
291 } else if ((c & 0xc0) == 0x80) {
292 /* mpeg 2 PES */
293 flags = avio_r8(s->pb);
294 header_len = avio_r8(s->pb);
295 len -= 2;
296 if (header_len > len)
297 goto error_redo;
298 len -= header_len;
299 if (flags & 0x80) {
300 dts = pts = get_pts(s->pb, -1);
301 header_len -= 5;
302 if (flags & 0x40) {
303 dts = get_pts(s->pb, -1);
304 header_len -= 5;
305 }
306 }
307 if (flags & 0x3f && header_len == 0){
308 flags &= 0xC0;
309 av_log(s, AV_LOG_WARNING, "Further flags set but no bytes left\n");
310 }
311 if (flags & 0x01) { /* PES extension */
312 pes_ext = avio_r8(s->pb);
313 header_len--;
314 /* Skip PES private data, program packet sequence counter and P-STD buffer */
315 skip = (pes_ext >> 4) & 0xb;
316 skip += skip & 0x9;
317 if (pes_ext & 0x40 || skip > header_len){
318 av_log(s, AV_LOG_WARNING, "pes_ext %X is invalid\n", pes_ext);
319 pes_ext=skip=0;
320 }
321 avio_skip(s->pb, skip);
322 header_len -= skip;
323
324 if (pes_ext & 0x01) { /* PES extension 2 */
325 ext2_len = avio_r8(s->pb);
326 header_len--;
327 if ((ext2_len & 0x7f) > 0) {
328 id_ext = avio_r8(s->pb);
329 if ((id_ext & 0x80) == 0)
330 startcode = ((startcode & 0xff) << 8) | id_ext;
331 header_len--;
332 }
333 }
334 }
335 if(header_len < 0)
336 goto error_redo;
337 avio_skip(s->pb, header_len);
338 }
339 else if( c!= 0xf )
340 goto redo;
341
342 if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
343 startcode = avio_r8(s->pb);
344 len--;
345 if (startcode >= 0x80 && startcode <= 0xcf) {
346 /* audio: skip header */
347 avio_r8(s->pb);
348 avio_r8(s->pb);
349 avio_r8(s->pb);
350 len -= 3;
351 if (startcode >= 0xb0 && startcode <= 0xbf) {
352 /* MLP/TrueHD audio has a 4-byte header */
353 avio_r8(s->pb);
354 len--;
355 }
356 }
357 }
358 if(len<0)
359 goto error_redo;
360 if(dts != AV_NOPTS_VALUE && ppos){
361 int i;
362 for(i=0; i<s->nb_streams; i++){
363 if(startcode == s->streams[i]->id &&
364 s->pb->seekable /* index useless on streams anyway */) {
365 ff_reduce_index(s, i);
366 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
367 }
368 }
369 }
370
371 *pstart_code = startcode;
372 *ppts = pts;
373 *pdts = dts;
374 return len;
375 }
376
377 static int mpegps_read_packet(AVFormatContext *s,
378 AVPacket *pkt)
379 {
380 MpegDemuxContext *m = s->priv_data;
381 AVStream *st;
382 int len, startcode, i, es_type, ret;
383 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
384 enum AVMediaType type;
385 int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
386 uint8_t av_uninit(dvdaudio_substream_type);
387
388 redo:
389 len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
390 if (len < 0)
391 return len;
392
393 if(startcode == 0x1bd) {
394 dvdaudio_substream_type = avio_r8(s->pb);
395 avio_skip(s->pb, 3);
396 len -= 4;
397 }
398
399 /* now find stream */
400 for(i=0;i<s->nb_streams;i++) {
401 st = s->streams[i];
402 if (st->id == startcode)
403 goto found;
404 }
405
406 es_type = m->psm_es_type[startcode & 0xff];
407 if(es_type > 0 && es_type != STREAM_TYPE_PRIVATE_DATA){
408 if(es_type == STREAM_TYPE_VIDEO_MPEG1){
409 codec_id = AV_CODEC_ID_MPEG2VIDEO;
410 type = AVMEDIA_TYPE_VIDEO;
411 } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
412 codec_id = AV_CODEC_ID_MPEG2VIDEO;
413 type = AVMEDIA_TYPE_VIDEO;
414 } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
415 es_type == STREAM_TYPE_AUDIO_MPEG2){
416 codec_id = AV_CODEC_ID_MP3;
417 type = AVMEDIA_TYPE_AUDIO;
418 } else if(es_type == STREAM_TYPE_AUDIO_AAC){
419 codec_id = AV_CODEC_ID_AAC;
420 type = AVMEDIA_TYPE_AUDIO;
421 } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
422 codec_id = AV_CODEC_ID_MPEG4;
423 type = AVMEDIA_TYPE_VIDEO;
424 } else if(es_type == STREAM_TYPE_VIDEO_H264){
425 codec_id = AV_CODEC_ID_H264;
426 type = AVMEDIA_TYPE_VIDEO;
427 } else if(es_type == STREAM_TYPE_AUDIO_AC3){
428 codec_id = AV_CODEC_ID_AC3;
429 type = AVMEDIA_TYPE_AUDIO;
430 } else {
431 goto skip;
432 }
433 } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
434 static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
435 unsigned char buf[8];
436 avio_read(s->pb, buf, 8);
437 avio_seek(s->pb, -8, SEEK_CUR);
438 if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
439 codec_id = AV_CODEC_ID_CAVS;
440 else
441 codec_id = AV_CODEC_ID_PROBE;
442 type = AVMEDIA_TYPE_VIDEO;
443 } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
444 type = AVMEDIA_TYPE_AUDIO;
445 codec_id = m->sofdec > 0 ? AV_CODEC_ID_ADPCM_ADX : AV_CODEC_ID_MP2;
446 } else if (startcode >= 0x80 && startcode <= 0x87) {
447 type = AVMEDIA_TYPE_AUDIO;
448 codec_id = AV_CODEC_ID_AC3;
449 } else if ( ( startcode >= 0x88 && startcode <= 0x8f)
450 ||( startcode >= 0x98 && startcode <= 0x9f)) {
451 /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
452 type = AVMEDIA_TYPE_AUDIO;
453 codec_id = AV_CODEC_ID_DTS;
454 } else if (startcode >= 0xa0 && startcode <= 0xaf) {
455 type = AVMEDIA_TYPE_AUDIO;
456 /* 16 bit form will be handled as AV_CODEC_ID_PCM_S16BE */
457 codec_id = AV_CODEC_ID_PCM_DVD;
458 } else if (startcode >= 0xb0 && startcode <= 0xbf) {
459 type = AVMEDIA_TYPE_AUDIO;
460 codec_id = AV_CODEC_ID_TRUEHD;
461 } else if (startcode >= 0xc0 && startcode <= 0xcf) {
462 /* Used for both AC-3 and E-AC-3 in EVOB files */
463 type = AVMEDIA_TYPE_AUDIO;
464 codec_id = AV_CODEC_ID_AC3;
465 } else if (startcode >= 0x20 && startcode <= 0x3f) {
466 type = AVMEDIA_TYPE_SUBTITLE;
467 codec_id = AV_CODEC_ID_DVD_SUBTITLE;
468 } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
469 type = AVMEDIA_TYPE_VIDEO;
470 codec_id = AV_CODEC_ID_VC1;
471 } else if (startcode == 0x1bd) {
472 // check dvd audio substream type
473 type = AVMEDIA_TYPE_AUDIO;
474 switch(dvdaudio_substream_type & 0xe0) {
475 case 0xa0: codec_id = AV_CODEC_ID_PCM_DVD;
476 break;
477 case 0x80: if((dvdaudio_substream_type & 0xf8) == 0x88)
478 codec_id = AV_CODEC_ID_DTS;
479 else codec_id = AV_CODEC_ID_AC3;
480 break;
481 default: av_log(s, AV_LOG_ERROR, "Unknown 0x1bd sub-stream\n");
482 goto skip;
483 }
484 } else {
485 skip:
486 /* skip packet */
487 avio_skip(s->pb, len);
488 goto redo;
489 }
490 /* no stream found: add a new stream */
491 st = avformat_new_stream(s, NULL);
492 if (!st)
493 goto skip;
494 st->id = startcode;
495 st->codec->codec_type = type;
496 st->codec->codec_id = codec_id;
497 if (codec_id != AV_CODEC_ID_PCM_S16BE)
498 st->need_parsing = AVSTREAM_PARSE_FULL;
499 found:
500 if(st->discard >= AVDISCARD_ALL)
501 goto skip;
502 if ((startcode >= 0xa0 && startcode <= 0xaf) ||
503 (startcode == 0x1bd && ((dvdaudio_substream_type & 0xe0) == 0xa0))) {
504 int b1, freq;
505
506 /* for LPCM, we just skip the header and consider it is raw
507 audio data */
508 if (len <= 3)
509 goto skip;
510 avio_r8(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
511 b1 = avio_r8(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
512 avio_r8(s->pb); /* dynamic range control (0x80 = off) */
513 len -= 3;
514 freq = (b1 >> 4) & 3;
515 st->codec->sample_rate = lpcm_freq_tab[freq];
516 st->codec->channels = 1 + (b1 & 7);
517 st->codec->bits_per_coded_sample = 16 + ((b1 >> 6) & 3) * 4;
518 st->codec->bit_rate = st->codec->channels *
519 st->codec->sample_rate *
520 st->codec->bits_per_coded_sample;
521 if (st->codec->bits_per_coded_sample == 16)
522 st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
523 else if (st->codec->bits_per_coded_sample == 28)
524 return AVERROR(EINVAL);
525 }
526 ret = av_get_packet(s->pb, pkt, len);
527 pkt->pts = pts;
528 pkt->dts = dts;
529 pkt->pos = dummy_pos;
530 pkt->stream_index = st->index;
531 av_dlog(s, "%d: pts=%0.3f dts=%0.3f size=%d\n",
532 pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0,
533 pkt->size);
534
535 return (ret < 0) ? ret : 0;
536 }
537
538 static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
539 int64_t *ppos, int64_t pos_limit)
540 {
541 int len, startcode;
542 int64_t pos, pts, dts;
543
544 pos = *ppos;
545 if (avio_seek(s->pb, pos, SEEK_SET) < 0)
546 return AV_NOPTS_VALUE;
547
548 for(;;) {
549 len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
550 if (len < 0) {
551 av_dlog(s, "none (ret=%d)\n", len);
552 return AV_NOPTS_VALUE;
553 }
554 if (startcode == s->streams[stream_index]->id &&
555 dts != AV_NOPTS_VALUE) {
556 break;
557 }
558 avio_skip(s->pb, len);
559 }
560 av_dlog(s, "pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n",
561 pos, dts, dts / 90000.0);
562 *ppos = pos;
563 return dts;
564 }
565
566 AVInputFormat ff_mpegps_demuxer = {
567 .name = "mpeg",
568 .long_name = NULL_IF_CONFIG_SMALL("MPEG-PS (MPEG-2 Program Stream)"),
569 .priv_data_size = sizeof(MpegDemuxContext),
570 .read_probe = mpegps_probe,
571 .read_header = mpegps_read_header,
572 .read_packet = mpegps_read_packet,
573 .read_timestamp = mpegps_read_dts,
574 .flags = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
575 };