Statistics
| Branch: | Revision:

ffmpeg / libavformat / mpeg.c @ 890d2799

History | View | Annotate | Download (17.4 KB)

1 de6d9b64 Fabrice Bellard
/*
2 2abe5a01 Baptiste Coudurier
 * MPEG1/2 demuxer
3 19720f15 Fabrice Bellard
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
4 de6d9b64 Fabrice Bellard
 *
5 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8 19720f15 Fabrice Bellard
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
11 de6d9b64 Fabrice Bellard
 *
12 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
13 de6d9b64 Fabrice Bellard
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 19720f15 Fabrice Bellard
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16 de6d9b64 Fabrice Bellard
 *
17 19720f15 Fabrice Bellard
 * You should have received a copy of the GNU Lesser General Public
18 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
19 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 de6d9b64 Fabrice Bellard
 */
21 2abe5a01 Baptiste Coudurier
22 de6d9b64 Fabrice Bellard
#include "avformat.h"
23 2abe5a01 Baptiste Coudurier
#include "mpeg.h"
24 de6d9b64 Fabrice Bellard
25 27f388aa Fabrice Bellard
//#define DEBUG_SEEK
26 de6d9b64 Fabrice Bellard
27 b754978a Michael Niedermayer
#undef NDEBUG
28
#include <assert.h>
29
30 de6d9b64 Fabrice Bellard
/*********************************************/
31
/* demux code */
32
33
#define MAX_SYNC_SIZE 100000
34
35 c5e33115 Allan Sandfeld Jensen
static int cdxa_probe(AVProbeData *p)
36
{
37
    /* check file header */
38
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
39
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
40
        p->buf[8] == 'C' && p->buf[9] == 'D' &&
41
        p->buf[10] == 'X' && p->buf[11] == 'A')
42
        return AVPROBE_SCORE_MAX;
43
    else
44
        return 0;
45
}
46
47 c6dcd0d7 Michael Niedermayer
static int check_pes(uint8_t *p, uint8_t *end){
48
    int pes1;
49
    int pes2=      (p[3] & 0xC0) == 0x80
50
                && (p[4] & 0xC0) != 0x40
51
                &&((p[4] & 0xC0) == 0x00 || (p[4]&0xC0)>>2 == (p[6]&0xF0));
52
53
    for(p+=3; p<end && *p == 0xFF; p++);
54
    if((*p&0xC0) == 0x40) p+=2;
55
    if((*p&0xF0) == 0x20){
56
        pes1= p[0]&p[2]&p[4]&1;
57
        p+=5;
58
    }else if((*p&0xF0) == 0x30){
59
        pes1= p[0]&p[2]&p[4]&p[5]&p[7]&p[9]&1;
60
        p+=10;
61
    }else
62
        pes1 = *p == 0x0F;
63
64
    return pes1||pes2;
65
}
66
67 db7f1f95 Fabrice Bellard
static int mpegps_probe(AVProbeData *p)
68
{
69 9870a7bd Michael Niedermayer
    uint32_t code= -1;
70 19e0e403 Måns Rullgård
    int sys=0, pspack=0, priv1=0, vid=0, audio=0;
71 95f97de1 Michael Niedermayer
    int i;
72 a1c69e0b Michael Niedermayer
    int score=0;
73 db7f1f95 Fabrice Bellard
74 c5e33115 Allan Sandfeld Jensen
    score = cdxa_probe(p);
75
    if (score > 0) return score;
76
77
    /* Search for MPEG stream */
78 9870a7bd Michael Niedermayer
    for(i=0; i<p->buf_size; i++){
79
        code = (code<<8) + p->buf[i];
80 ec23a472 Isaac Richards
        if ((code & 0xffffff00) == 0x100) {
81 0c904db1 Michael Niedermayer
            int pes= check_pes(p->buf+i, p->buf+p->buf_size);
82 c6dcd0d7 Michael Niedermayer
83 25c533a2 Måns Rullgård
            if(code == SYSTEM_HEADER_START_CODE) sys++;
84
            else if(code == PRIVATE_STREAM_1)    priv1++;
85
            else if(code == PACK_START_CODE)     pspack++;
86 c6dcd0d7 Michael Niedermayer
            else if((code & 0xf0) == VIDEO_ID && pes) vid++;
87
            else if((code & 0xe0) == AUDIO_ID && pes) audio++;
88 ec23a472 Isaac Richards
        }
89 db7f1f95 Fabrice Bellard
    }
90 a1c69e0b Michael Niedermayer
91
    if(vid || audio)            /* invalid VDR files nd short PES streams */
92
        score= AVPROBE_SCORE_MAX/4;
93
94 3504467f Michael Niedermayer
//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d len:%d\n", sys, priv1, pspack,vid, audio, p->buf_size);
95 9870a7bd Michael Niedermayer
    if(sys && sys*9 <= pspack*10)
96
        return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
97 25c533a2 Måns Rullgård
    if((priv1 || vid || audio) && (priv1+vid+audio)*9 <= pspack*10)
98 0b2bb354 Michael Niedermayer
        return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
99 4cd25081 Michael Niedermayer
    if((!!vid ^ !!audio) && (audio+vid > 1) && !sys && !pspack && p->buf_size>2048) /* PES stream */
100 25c533a2 Måns Rullgård
        return AVPROBE_SCORE_MAX/2+2;
101 a1c69e0b Michael Niedermayer
102
    //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
103
    return score;
104 db7f1f95 Fabrice Bellard
}
105
106
107 de6d9b64 Fabrice Bellard
typedef struct MpegDemuxContext {
108 191e8ca7 Måns Rullgård
    int32_t header_state;
109 e3d1cd8e Måns Rullgård
    unsigned char psm_es_type[256];
110 8cd4ac3d Aurelien Jacobs
    int sofdec;
111 de6d9b64 Fabrice Bellard
} MpegDemuxContext;
112
113 27f388aa Fabrice Bellard
static int mpegps_read_header(AVFormatContext *s,
114
                              AVFormatParameters *ap)
115
{
116
    MpegDemuxContext *m = s->priv_data;
117 2c187847 Måns Rullgård
    const char *sofdec = "Sofdec";
118
    int v, i = 0;
119 8cd4ac3d Aurelien Jacobs
120 27f388aa Fabrice Bellard
    m->header_state = 0xff;
121
    s->ctx_flags |= AVFMTCTX_NOHEADER;
122
123 2c187847 Måns Rullgård
    m->sofdec = -1;
124
    do {
125 899681cd Björn Axelsson
        v = get_byte(s->pb);
126 2c187847 Måns Rullgård
        m->header_state = m->header_state << 8 | v;
127
        m->sofdec++;
128
    } while (v == sofdec[i] && i++ < 6);
129 8cd4ac3d Aurelien Jacobs
130 27f388aa Fabrice Bellard
    /* no need to do more */
131
    return 0;
132
}
133
134
static int64_t get_pts(ByteIOContext *pb, int c)
135
{
136
    int64_t pts;
137
    int val;
138
139
    if (c < 0)
140
        c = get_byte(pb);
141
    pts = (int64_t)((c >> 1) & 0x07) << 30;
142
    val = get_be16(pb);
143
    pts |= (int64_t)(val >> 1) << 15;
144
    val = get_be16(pb);
145
    pts |= (int64_t)(val >> 1);
146
    return pts;
147
}
148
149 115329f1 Diego Biurrun
static int find_next_start_code(ByteIOContext *pb, int *size_ptr,
150 191e8ca7 Måns Rullgård
                                int32_t *header_state)
151 de6d9b64 Fabrice Bellard
{
152
    unsigned int state, v;
153
    int val, n;
154
155
    state = *header_state;
156
    n = *size_ptr;
157
    while (n > 0) {
158
        if (url_feof(pb))
159
            break;
160
        v = get_byte(pb);
161
        n--;
162
        if (state == 0x000001) {
163
            state = ((state << 8) | v) & 0xffffff;
164
            val = state;
165
            goto found;
166
        }
167
        state = ((state << 8) | v) & 0xffffff;
168
    }
169
    val = -1;
170
 found:
171
    *header_state = state;
172
    *size_ptr = n;
173
    return val;
174
}
175
176 88730be6 Måns Rullgård
#if 0 /* unused, remove? */
177 27f388aa Fabrice Bellard
/* XXX: optimize */
178
static int find_prev_start_code(ByteIOContext *pb, int *size_ptr)
179 de6d9b64 Fabrice Bellard
{
180 27f388aa Fabrice Bellard
    int64_t pos, pos_start;
181
    int max_size, start_code;
182 da24c5e3 Fabrice Bellard

183 27f388aa Fabrice Bellard
    max_size = *size_ptr;
184
    pos_start = url_ftell(pb);
185 de6d9b64 Fabrice Bellard

186 27f388aa Fabrice Bellard
    /* in order to go faster, we fill the buffer */
187
    pos = pos_start - 16386;
188
    if (pos < 0)
189
        pos = 0;
190
    url_fseek(pb, pos, SEEK_SET);
191
    get_byte(pb);
192 de6d9b64 Fabrice Bellard

193 27f388aa Fabrice Bellard
    pos = pos_start;
194
    for(;;) {
195
        pos--;
196
        if (pos < 0 || (pos_start - pos) >= max_size) {
197
            start_code = -1;
198
            goto the_end;
199
        }
200
        url_fseek(pb, pos, SEEK_SET);
201
        start_code = get_be32(pb);
202
        if ((start_code & 0xffffff00) == 0x100)
203
            break;
204
    }
205
 the_end:
206
    *size_ptr = pos_start - pos;
207
    return start_code;
208 de6d9b64 Fabrice Bellard
}
209 88730be6 Måns Rullgård
#endif
210 de6d9b64 Fabrice Bellard
211 e3d1cd8e Måns Rullgård
/**
212
 * Extracts stream types from a program stream map
213
 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
214 115329f1 Diego Biurrun
 *
215 e3d1cd8e Måns Rullgård
 * @return number of bytes occupied by PSM in the bitstream
216
 */
217
static long mpegps_psm_parse(MpegDemuxContext *m, ByteIOContext *pb)
218
{
219
    int psm_length, ps_info_length, es_map_length;
220
221
    psm_length = get_be16(pb);
222
    get_byte(pb);
223
    get_byte(pb);
224
    ps_info_length = get_be16(pb);
225
226
    /* skip program_stream_info */
227
    url_fskip(pb, ps_info_length);
228
    es_map_length = get_be16(pb);
229
230
    /* at least one es available? */
231
    while (es_map_length >= 4){
232
        unsigned char type = get_byte(pb);
233
        unsigned char es_id = get_byte(pb);
234
        uint16_t es_info_length = get_be16(pb);
235
        /* remember mapping from stream id to stream type */
236
        m->psm_es_type[es_id] = type;
237
        /* skip program_stream_info */
238
        url_fskip(pb, es_info_length);
239
        es_map_length -= 4 + es_info_length;
240
    }
241
    get_be32(pb); /* crc32 */
242
    return 2 + psm_length;
243
}
244
245 115329f1 Diego Biurrun
/* read the next PES header. Return its position in ppos
246 27f388aa Fabrice Bellard
   (if not NULL), and its start code, pts and dts.
247
 */
248
static int mpegps_read_pes_header(AVFormatContext *s,
249 115329f1 Diego Biurrun
                                  int64_t *ppos, int *pstart_code,
250 8d14a25c Michael Niedermayer
                                  int64_t *ppts, int64_t *pdts)
251 de6d9b64 Fabrice Bellard
{
252
    MpegDemuxContext *m = s->priv_data;
253 27f388aa Fabrice Bellard
    int len, size, startcode, c, flags, header_len;
254 aad512b4 Michael Niedermayer
    int pes_ext, ext2_len, id_ext, skip;
255 e56cfad0 Michael Niedermayer
    int64_t pts, dts;
256 899681cd Björn Axelsson
    int64_t last_sync= url_ftell(s->pb);
257 de6d9b64 Fabrice Bellard
258 e56cfad0 Michael Niedermayer
 error_redo:
259 899681cd Björn Axelsson
        url_fseek(s->pb, last_sync, SEEK_SET);
260 de6d9b64 Fabrice Bellard
 redo:
261 27f388aa Fabrice Bellard
        /* next start code (should be immediately after) */
262
        m->header_state = 0xff;
263
        size = MAX_SYNC_SIZE;
264 899681cd Björn Axelsson
        startcode = find_next_start_code(s->pb, &size, &m->header_state);
265
        last_sync = url_ftell(s->pb);
266
    //printf("startcode=%x pos=0x%"PRIx64"\n", startcode, url_ftell(s->pb));
267 de6d9b64 Fabrice Bellard
    if (startcode < 0)
268 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
269 de6d9b64 Fabrice Bellard
    if (startcode == PACK_START_CODE)
270
        goto redo;
271
    if (startcode == SYSTEM_HEADER_START_CODE)
272
        goto redo;
273 2c187847 Måns Rullgård
    if (startcode == PADDING_STREAM) {
274 899681cd Björn Axelsson
        url_fskip(s->pb, get_be16(s->pb));
275 2c187847 Måns Rullgård
        goto redo;
276
    }
277
    if (startcode == PRIVATE_STREAM_2) {
278 899681cd Björn Axelsson
        len = get_be16(s->pb);
279 2c187847 Måns Rullgård
        if (!m->sofdec) {
280
            while (len-- >= 6) {
281 899681cd Björn Axelsson
                if (get_byte(s->pb) == 'S') {
282 2c187847 Måns Rullgård
                    uint8_t buf[5];
283 899681cd Björn Axelsson
                    get_buffer(s->pb, buf, sizeof(buf));
284 2c187847 Måns Rullgård
                    m->sofdec = !memcmp(buf, "ofdec", 5);
285
                    len -= sizeof(buf);
286
                    break;
287
                }
288
            }
289
            m->sofdec -= !m->sofdec;
290
        }
291 899681cd Björn Axelsson
        url_fskip(s->pb, len);
292 de6d9b64 Fabrice Bellard
        goto redo;
293
    }
294 e3d1cd8e Måns Rullgård
    if (startcode == PROGRAM_STREAM_MAP) {
295 899681cd Björn Axelsson
        mpegps_psm_parse(m, s->pb);
296 e3d1cd8e Måns Rullgård
        goto redo;
297
    }
298 115329f1 Diego Biurrun
299 de6d9b64 Fabrice Bellard
    /* find matching stream */
300
    if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
301
          (startcode >= 0x1e0 && startcode <= 0x1ef) ||
302 aad512b4 Michael Niedermayer
          (startcode == 0x1bd) || (startcode == 0x1fd)))
303 de6d9b64 Fabrice Bellard
        goto redo;
304 27f388aa Fabrice Bellard
    if (ppos) {
305 899681cd Björn Axelsson
        *ppos = url_ftell(s->pb) - 4;
306 27f388aa Fabrice Bellard
    }
307 899681cd Björn Axelsson
    len = get_be16(s->pb);
308 75a9fbb9 Michael Niedermayer
    pts =
309 b2cac184 Fabrice Bellard
    dts = AV_NOPTS_VALUE;
310 de6d9b64 Fabrice Bellard
    /* stuffing */
311
    for(;;) {
312 27f388aa Fabrice Bellard
        if (len < 1)
313 e56cfad0 Michael Niedermayer
            goto error_redo;
314 899681cd Björn Axelsson
        c = get_byte(s->pb);
315 de6d9b64 Fabrice Bellard
        len--;
316
        /* XXX: for mpeg1, should test only bit 7 */
317 115329f1 Diego Biurrun
        if (c != 0xff)
318 de6d9b64 Fabrice Bellard
            break;
319
    }
320
    if ((c & 0xc0) == 0x40) {
321
        /* buffer scale & size */
322 899681cd Björn Axelsson
        get_byte(s->pb);
323
        c = get_byte(s->pb);
324 de6d9b64 Fabrice Bellard
        len -= 2;
325
    }
326 b90ba24b Michael Niedermayer
    if ((c & 0xe0) == 0x20) {
327 899681cd Björn Axelsson
        dts = pts = get_pts(s->pb, c);
328 de6d9b64 Fabrice Bellard
        len -= 4;
329 b90ba24b Michael Niedermayer
        if (c & 0x10){
330 899681cd Björn Axelsson
            dts = get_pts(s->pb, -1);
331 b90ba24b Michael Niedermayer
            len -= 5;
332
        }
333 de6d9b64 Fabrice Bellard
    } else if ((c & 0xc0) == 0x80) {
334
        /* mpeg 2 PES */
335 d8bee8dd Måns Rullgård
#if 0 /* some streams have this field set for no apparent reason */
336 de6d9b64 Fabrice Bellard
        if ((c & 0x30) != 0) {
337 27f388aa Fabrice Bellard
            /* Encrypted multiplex not handled */
338
            goto redo;
339 de6d9b64 Fabrice Bellard
        }
340 d8bee8dd Måns Rullgård
#endif
341 899681cd Björn Axelsson
        flags = get_byte(s->pb);
342
        header_len = get_byte(s->pb);
343 de6d9b64 Fabrice Bellard
        len -= 2;
344
        if (header_len > len)
345 e56cfad0 Michael Niedermayer
            goto error_redo;
346 80036204 Michael Niedermayer
        len -= header_len;
347 b90ba24b Michael Niedermayer
        if (flags & 0x80) {
348 899681cd Björn Axelsson
            dts = pts = get_pts(s->pb, -1);
349 de6d9b64 Fabrice Bellard
            header_len -= 5;
350 b90ba24b Michael Niedermayer
            if (flags & 0x40) {
351 899681cd Björn Axelsson
                dts = get_pts(s->pb, -1);
352 b90ba24b Michael Niedermayer
                header_len -= 5;
353
            }
354 de6d9b64 Fabrice Bellard
        }
355 aad512b4 Michael Niedermayer
        if (flags & 0x01) { /* PES extension */
356 899681cd Björn Axelsson
            pes_ext = get_byte(s->pb);
357 aad512b4 Michael Niedermayer
            header_len--;
358
            if (pes_ext & 0x40) { /* pack header - should be zero in PS */
359
                goto error_redo;
360
            }
361
            /* Skip PES private data, program packet sequence counter and P-STD buffer */
362
            skip = (pes_ext >> 4) & 0xb;
363
            skip += skip & 0x9;
364 899681cd Björn Axelsson
            url_fskip(s->pb, skip);
365 aad512b4 Michael Niedermayer
            header_len -= skip;
366
367
            if (pes_ext & 0x01) { /* PES extension 2 */
368 899681cd Björn Axelsson
                ext2_len = get_byte(s->pb);
369 aad512b4 Michael Niedermayer
                header_len--;
370
                if ((ext2_len & 0x7f) > 0) {
371 899681cd Björn Axelsson
                    id_ext = get_byte(s->pb);
372 aad512b4 Michael Niedermayer
                    if ((id_ext & 0x80) == 0)
373
                        startcode = ((startcode & 0xff) << 8) | id_ext;
374
                    header_len--;
375
                }
376
            }
377
        }
378 80036204 Michael Niedermayer
        if(header_len < 0)
379
            goto error_redo;
380 899681cd Björn Axelsson
        url_fskip(s->pb, header_len);
381 de6d9b64 Fabrice Bellard
    }
382 df70de1f Dmitry Borisov
    else if( c!= 0xf )
383
        goto redo;
384
385 e3d1cd8e Måns Rullgård
    if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
386 899681cd Björn Axelsson
        startcode = get_byte(s->pb);
387 de6d9b64 Fabrice Bellard
        len--;
388 aad512b4 Michael Niedermayer
        if (startcode >= 0x80 && startcode <= 0xcf) {
389 de6d9b64 Fabrice Bellard
            /* audio: skip header */
390 899681cd Björn Axelsson
            get_byte(s->pb);
391
            get_byte(s->pb);
392
            get_byte(s->pb);
393 de6d9b64 Fabrice Bellard
            len -= 3;
394 aad512b4 Michael Niedermayer
            if (startcode >= 0xb0 && startcode <= 0xbf) {
395
                /* MLP/TrueHD audio has a 4-byte header */
396 899681cd Björn Axelsson
                get_byte(s->pb);
397 aad512b4 Michael Niedermayer
                len--;
398
            }
399 de6d9b64 Fabrice Bellard
        }
400
    }
401 7e4709b1 Michael Niedermayer
    if(len<0)
402
        goto error_redo;
403 b754978a Michael Niedermayer
    if(dts != AV_NOPTS_VALUE && ppos){
404
        int i;
405
        for(i=0; i<s->nb_streams; i++){
406
            if(startcode == s->streams[i]->id) {
407 30a43f2d Michael Niedermayer
                av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
408 b754978a Michael Niedermayer
            }
409
        }
410
    }
411 115329f1 Diego Biurrun
412 27f388aa Fabrice Bellard
    *pstart_code = startcode;
413
    *ppts = pts;
414
    *pdts = dts;
415
    return len;
416
}
417
418
static int mpegps_read_packet(AVFormatContext *s,
419
                              AVPacket *pkt)
420
{
421 e3d1cd8e Måns Rullgård
    MpegDemuxContext *m = s->priv_data;
422 27f388aa Fabrice Bellard
    AVStream *st;
423 e3d1cd8e Måns Rullgård
    int len, startcode, i, type, codec_id = 0, es_type;
424 b754978a Michael Niedermayer
    int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
425 27f388aa Fabrice Bellard
426
 redo:
427 8d14a25c Michael Niedermayer
    len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
428 27f388aa Fabrice Bellard
    if (len < 0)
429
        return len;
430 115329f1 Diego Biurrun
431 de6d9b64 Fabrice Bellard
    /* now find stream */
432
    for(i=0;i<s->nb_streams;i++) {
433
        st = s->streams[i];
434
        if (st->id == startcode)
435
            goto found;
436
    }
437 e3d1cd8e Måns Rullgård
438
    es_type = m->psm_es_type[startcode & 0xff];
439
    if(es_type > 0){
440
        if(es_type == STREAM_TYPE_VIDEO_MPEG1){
441
            codec_id = CODEC_ID_MPEG2VIDEO;
442
            type = CODEC_TYPE_VIDEO;
443
        } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
444
            codec_id = CODEC_ID_MPEG2VIDEO;
445
            type = CODEC_TYPE_VIDEO;
446
        } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
447
                  es_type == STREAM_TYPE_AUDIO_MPEG2){
448
            codec_id = CODEC_ID_MP3;
449
            type = CODEC_TYPE_AUDIO;
450
        } else if(es_type == STREAM_TYPE_AUDIO_AAC){
451
            codec_id = CODEC_ID_AAC;
452
            type = CODEC_TYPE_AUDIO;
453
        } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
454
            codec_id = CODEC_ID_MPEG4;
455
            type = CODEC_TYPE_VIDEO;
456
        } else if(es_type == STREAM_TYPE_VIDEO_H264){
457
            codec_id = CODEC_ID_H264;
458
            type = CODEC_TYPE_VIDEO;
459
        } else if(es_type == STREAM_TYPE_AUDIO_AC3){
460
            codec_id = CODEC_ID_AC3;
461
            type = CODEC_TYPE_AUDIO;
462
        } else {
463
            goto skip;
464
        }
465
    } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
466 83d07313 Måns Rullgård
        static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
467
        unsigned char buf[8];
468 899681cd Björn Axelsson
        get_buffer(s->pb, buf, 8);
469
        url_fseek(s->pb, -8, SEEK_CUR);
470 83d07313 Måns Rullgård
        if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
471
            codec_id = CODEC_ID_CAVS;
472
        else
473
            codec_id = CODEC_ID_MPEG2VIDEO;
474 db7f1f95 Fabrice Bellard
        type = CODEC_TYPE_VIDEO;
475
    } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
476
        type = CODEC_TYPE_AUDIO;
477 2c187847 Måns Rullgård
        codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
478 3f2bf07b Joakim Plate
    } else if (startcode >= 0x80 && startcode <= 0x87) {
479 db7f1f95 Fabrice Bellard
        type = CODEC_TYPE_AUDIO;
480
        codec_id = CODEC_ID_AC3;
481 aad512b4 Michael Niedermayer
    } else if ((startcode >= 0x88 && startcode <= 0x8f)
482
               ||( startcode >= 0x98 && startcode <= 0x9f)) {
483
        /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
484 23c99253 Michael Niedermayer
        type = CODEC_TYPE_AUDIO;
485
        codec_id = CODEC_ID_DTS;
486 aad512b4 Michael Niedermayer
    } else if (startcode >= 0xa0 && startcode <= 0xaf) {
487 9ec05e36 Fabrice Bellard
        type = CODEC_TYPE_AUDIO;
488
        codec_id = CODEC_ID_PCM_S16BE;
489 aad512b4 Michael Niedermayer
    } else if (startcode >= 0xb0 && startcode <= 0xbf) {
490
        type = CODEC_TYPE_AUDIO;
491
        codec_id = CODEC_ID_MLP;
492
    } else if (startcode >= 0xc0 && startcode <= 0xcf) {
493
        /* Used for both AC-3 and E-AC-3 in EVOB files */
494
        type = CODEC_TYPE_AUDIO;
495
        codec_id = CODEC_ID_AC3;
496 a9c3213f Fabrice Bellard
    } else if (startcode >= 0x20 && startcode <= 0x3f) {
497
        type = CODEC_TYPE_SUBTITLE;
498
        codec_id = CODEC_ID_DVD_SUBTITLE;
499 aad512b4 Michael Niedermayer
    } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
500
        type = CODEC_TYPE_VIDEO;
501
        codec_id = CODEC_ID_VC1;
502 db7f1f95 Fabrice Bellard
    } else {
503
    skip:
504
        /* skip packet */
505 899681cd Björn Axelsson
        url_fskip(s->pb, len);
506 db7f1f95 Fabrice Bellard
        goto redo;
507
    }
508 1e5c667c Fabrice Bellard
    /* no stream found: add a new stream */
509
    st = av_new_stream(s, startcode);
510 115329f1 Diego Biurrun
    if (!st)
511 1e5c667c Fabrice Bellard
        goto skip;
512 01f4895c Michael Niedermayer
    st->codec->codec_type = type;
513
    st->codec->codec_id = codec_id;
514 27f388aa Fabrice Bellard
    if (codec_id != CODEC_ID_PCM_S16BE)
515 57004ff1 Aurelien Jacobs
        st->need_parsing = AVSTREAM_PARSE_FULL;
516 de6d9b64 Fabrice Bellard
 found:
517 f3356e9c Michael Niedermayer
    if(st->discard >= AVDISCARD_ALL)
518 b9866ebc Michael Niedermayer
        goto skip;
519 aad512b4 Michael Niedermayer
    if (startcode >= 0xa0 && startcode <= 0xaf) {
520 9ec05e36 Fabrice Bellard
        int b1, freq;
521
522
        /* for LPCM, we just skip the header and consider it is raw
523
           audio data */
524
        if (len <= 3)
525
            goto skip;
526 899681cd Björn Axelsson
        get_byte(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
527
        b1 = get_byte(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
528
        get_byte(s->pb); /* dynamic range control (0x80 = off) */
529 9ec05e36 Fabrice Bellard
        len -= 3;
530
        freq = (b1 >> 4) & 3;
531 01f4895c Michael Niedermayer
        st->codec->sample_rate = lpcm_freq_tab[freq];
532
        st->codec->channels = 1 + (b1 & 7);
533
        st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * 2;
534 9ec05e36 Fabrice Bellard
    }
535 de6d9b64 Fabrice Bellard
    av_new_packet(pkt, len);
536 899681cd Björn Axelsson
    get_buffer(s->pb, pkt->data, pkt->size);
537 de6d9b64 Fabrice Bellard
    pkt->pts = pts;
538 27f388aa Fabrice Bellard
    pkt->dts = dts;
539 db7f1f95 Fabrice Bellard
    pkt->stream_index = st->index;
540 27a206e0 Michel Bardiaux
#if 0
541 b9866ebc Michael Niedermayer
    av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
542
           pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size);
543 27a206e0 Michel Bardiaux
#endif
544 0bd586c5 Mike Melanson
545 de6d9b64 Fabrice Bellard
    return 0;
546
}
547
548 db7f1f95 Fabrice Bellard
static int mpegps_read_close(AVFormatContext *s)
549 de6d9b64 Fabrice Bellard
{
550
    return 0;
551
}
552
553 115329f1 Diego Biurrun
static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
554 8d14a25c Michael Niedermayer
                               int64_t *ppos, int64_t pos_limit)
555 27f388aa Fabrice Bellard
{
556
    int len, startcode;
557
    int64_t pos, pts, dts;
558
559
    pos = *ppos;
560
#ifdef DEBUG_SEEK
561 949b1a13 Steve L'Homme
    printf("read_dts: pos=0x%"PRIx64" next=%d -> ", pos, find_next);
562 27f388aa Fabrice Bellard
#endif
563 899681cd Björn Axelsson
    url_fseek(s->pb, pos, SEEK_SET);
564 27f388aa Fabrice Bellard
    for(;;) {
565 8d14a25c Michael Niedermayer
        len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
566 27f388aa Fabrice Bellard
        if (len < 0) {
567
#ifdef DEBUG_SEEK
568
            printf("none (ret=%d)\n", len);
569
#endif
570
            return AV_NOPTS_VALUE;
571
        }
572 115329f1 Diego Biurrun
        if (startcode == s->streams[stream_index]->id &&
573 27f388aa Fabrice Bellard
            dts != AV_NOPTS_VALUE) {
574
            break;
575
        }
576 899681cd Björn Axelsson
        url_fskip(s->pb, len);
577 27f388aa Fabrice Bellard
    }
578
#ifdef DEBUG_SEEK
579 949b1a13 Steve L'Homme
    printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0);
580 27f388aa Fabrice Bellard
#endif
581
    *ppos = pos;
582 cdd5034f Michael Niedermayer
    return dts;
583 27f388aa Fabrice Bellard
}
584
585 d2a067d1 Måns Rullgård
AVInputFormat mpegps_demuxer = {
586 db7f1f95 Fabrice Bellard
    "mpeg",
587
    "MPEG PS format",
588
    sizeof(MpegDemuxContext),
589
    mpegps_probe,
590
    mpegps_read_header,
591
    mpegps_read_packet,
592
    mpegps_read_close,
593 8d14a25c Michael Niedermayer
    NULL, //mpegps_read_seek,
594
    mpegps_read_dts,
595 a9c3213f Fabrice Bellard
    .flags = AVFMT_SHOW_IDS,
596 de6d9b64 Fabrice Bellard
};