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ffmpeg / libavformat / mpeg.c @ a23c9c4a

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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 c6dcd0d7 Michael Niedermayer
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 db7f1f95 Fabrice Bellard
static int mpegps_probe(AVProbeData *p)
56
{
57 9870a7bd Michael Niedermayer
    uint32_t code= -1;
58 7e1720de Michael Niedermayer
    int sys=0, pspack=0, priv1=0, vid=0, audio=0, invalid=0;
59 95f97de1 Michael Niedermayer
    int i;
60 a1c69e0b Michael Niedermayer
    int score=0;
61 db7f1f95 Fabrice Bellard
62 9870a7bd Michael Niedermayer
    for(i=0; i<p->buf_size; i++){
63
        code = (code<<8) + p->buf[i];
64 ec23a472 Isaac Richards
        if ((code & 0xffffff00) == 0x100) {
65 0c904db1 Michael Niedermayer
            int pes= check_pes(p->buf+i, p->buf+p->buf_size);
66 c6dcd0d7 Michael Niedermayer
67 25c533a2 Måns Rullgård
            if(code == SYSTEM_HEADER_START_CODE) sys++;
68
            else if(code == PRIVATE_STREAM_1)    priv1++;
69
            else if(code == PACK_START_CODE)     pspack++;
70 c6dcd0d7 Michael Niedermayer
            else if((code & 0xf0) == VIDEO_ID && pes) vid++;
71
            else if((code & 0xe0) == AUDIO_ID && pes) audio++;
72 7e1720de Michael Niedermayer
73
            else if((code & 0xf0) == VIDEO_ID && !pes) invalid++;
74
            else if((code & 0xe0) == AUDIO_ID && !pes) invalid++;
75 ec23a472 Isaac Richards
        }
76 db7f1f95 Fabrice Bellard
    }
77 a1c69e0b Michael Niedermayer
78 7e1720de Michael Niedermayer
    if(vid+audio > invalid)     /* invalid VDR files nd short PES streams */
79 a1c69e0b Michael Niedermayer
        score= AVPROBE_SCORE_MAX/4;
80
81 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);
82 7e1720de Michael Niedermayer
    if(sys>invalid && sys*9 <= pspack*10)
83 9870a7bd Michael Niedermayer
        return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
84 7e1720de Michael Niedermayer
    if(priv1 + vid + audio > invalid && (priv1+vid+audio)*9 <= pspack*10)
85 0b2bb354 Michael Niedermayer
        return AVPROBE_SCORE_MAX/2+2; // +1 for .mpg
86 4cd25081 Michael Niedermayer
    if((!!vid ^ !!audio) && (audio+vid > 1) && !sys && !pspack && p->buf_size>2048) /* PES stream */
87 25c533a2 Måns Rullgård
        return AVPROBE_SCORE_MAX/2+2;
88 a1c69e0b Michael Niedermayer
89
    //02-Penguin.flac has sys:0 priv1:0 pspack:0 vid:0 audio:1
90
    return score;
91 db7f1f95 Fabrice Bellard
}
92
93
94 de6d9b64 Fabrice Bellard
typedef struct MpegDemuxContext {
95 191e8ca7 Måns Rullgård
    int32_t header_state;
96 e3d1cd8e Måns Rullgård
    unsigned char psm_es_type[256];
97 8cd4ac3d Aurelien Jacobs
    int sofdec;
98 de6d9b64 Fabrice Bellard
} MpegDemuxContext;
99
100 27f388aa Fabrice Bellard
static int mpegps_read_header(AVFormatContext *s,
101
                              AVFormatParameters *ap)
102
{
103
    MpegDemuxContext *m = s->priv_data;
104 2c187847 Måns Rullgård
    const char *sofdec = "Sofdec";
105
    int v, i = 0;
106 8cd4ac3d Aurelien Jacobs
107 27f388aa Fabrice Bellard
    m->header_state = 0xff;
108
    s->ctx_flags |= AVFMTCTX_NOHEADER;
109
110 2c187847 Måns Rullgård
    m->sofdec = -1;
111
    do {
112 899681cd Björn Axelsson
        v = get_byte(s->pb);
113 2c187847 Måns Rullgård
        m->header_state = m->header_state << 8 | v;
114
        m->sofdec++;
115
    } while (v == sofdec[i] && i++ < 6);
116 8cd4ac3d Aurelien Jacobs
117 27f388aa Fabrice Bellard
    /* no need to do more */
118
    return 0;
119
}
120
121
static int64_t get_pts(ByteIOContext *pb, int c)
122
{
123 66e9e302 Ivo van Poorten
    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 27f388aa Fabrice Bellard
}
130
131 115329f1 Diego Biurrun
static int find_next_start_code(ByteIOContext *pb, int *size_ptr,
132 191e8ca7 Måns Rullgård
                                int32_t *header_state)
133 de6d9b64 Fabrice Bellard
{
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 88730be6 Måns Rullgård
#if 0 /* unused, remove? */
159 27f388aa Fabrice Bellard
/* XXX: optimize */
160
static int find_prev_start_code(ByteIOContext *pb, int *size_ptr)
161 de6d9b64 Fabrice Bellard
{
162 27f388aa Fabrice Bellard
    int64_t pos, pos_start;
163
    int max_size, start_code;
164 da24c5e3 Fabrice Bellard

165 27f388aa Fabrice Bellard
    max_size = *size_ptr;
166
    pos_start = url_ftell(pb);
167 de6d9b64 Fabrice Bellard

168 27f388aa Fabrice Bellard
    /* 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 de6d9b64 Fabrice Bellard

175 27f388aa Fabrice Bellard
    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 de6d9b64 Fabrice Bellard
}
191 88730be6 Måns Rullgård
#endif
192 de6d9b64 Fabrice Bellard
193 e3d1cd8e Måns Rullgård
/**
194
 * Extracts stream types from a program stream map
195
 * According to ISO/IEC 13818-1 ('MPEG-2 Systems') table 2-35
196 115329f1 Diego Biurrun
 *
197 e3d1cd8e Måns Rullgård
 * @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 115329f1 Diego Biurrun
/* read the next PES header. Return its position in ppos
228 27f388aa Fabrice Bellard
   (if not NULL), and its start code, pts and dts.
229
 */
230
static int mpegps_read_pes_header(AVFormatContext *s,
231 115329f1 Diego Biurrun
                                  int64_t *ppos, int *pstart_code,
232 8d14a25c Michael Niedermayer
                                  int64_t *ppts, int64_t *pdts)
233 de6d9b64 Fabrice Bellard
{
234
    MpegDemuxContext *m = s->priv_data;
235 27f388aa Fabrice Bellard
    int len, size, startcode, c, flags, header_len;
236 aad512b4 Michael Niedermayer
    int pes_ext, ext2_len, id_ext, skip;
237 e56cfad0 Michael Niedermayer
    int64_t pts, dts;
238 899681cd Björn Axelsson
    int64_t last_sync= url_ftell(s->pb);
239 de6d9b64 Fabrice Bellard
240 e56cfad0 Michael Niedermayer
 error_redo:
241 899681cd Björn Axelsson
        url_fseek(s->pb, last_sync, SEEK_SET);
242 de6d9b64 Fabrice Bellard
 redo:
243 27f388aa Fabrice Bellard
        /* next start code (should be immediately after) */
244
        m->header_state = 0xff;
245
        size = MAX_SYNC_SIZE;
246 899681cd Björn Axelsson
        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 de6d9b64 Fabrice Bellard
    if (startcode < 0)
250 6f3e0b21 Panagiotis Issaris
        return AVERROR(EIO);
251 de6d9b64 Fabrice Bellard
    if (startcode == PACK_START_CODE)
252
        goto redo;
253
    if (startcode == SYSTEM_HEADER_START_CODE)
254
        goto redo;
255 2c187847 Måns Rullgård
    if (startcode == PADDING_STREAM) {
256 899681cd Björn Axelsson
        url_fskip(s->pb, get_be16(s->pb));
257 2c187847 Måns Rullgård
        goto redo;
258
    }
259
    if (startcode == PRIVATE_STREAM_2) {
260 899681cd Björn Axelsson
        len = get_be16(s->pb);
261 2c187847 Måns Rullgård
        if (!m->sofdec) {
262
            while (len-- >= 6) {
263 899681cd Björn Axelsson
                if (get_byte(s->pb) == 'S') {
264 2c187847 Måns Rullgård
                    uint8_t buf[5];
265 899681cd Björn Axelsson
                    get_buffer(s->pb, buf, sizeof(buf));
266 2c187847 Måns Rullgård
                    m->sofdec = !memcmp(buf, "ofdec", 5);
267
                    len -= sizeof(buf);
268
                    break;
269
                }
270
            }
271
            m->sofdec -= !m->sofdec;
272
        }
273 899681cd Björn Axelsson
        url_fskip(s->pb, len);
274 de6d9b64 Fabrice Bellard
        goto redo;
275
    }
276 e3d1cd8e Måns Rullgård
    if (startcode == PROGRAM_STREAM_MAP) {
277 899681cd Björn Axelsson
        mpegps_psm_parse(m, s->pb);
278 e3d1cd8e Måns Rullgård
        goto redo;
279
    }
280 115329f1 Diego Biurrun
281 de6d9b64 Fabrice Bellard
    /* find matching stream */
282
    if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
283
          (startcode >= 0x1e0 && startcode <= 0x1ef) ||
284 aad512b4 Michael Niedermayer
          (startcode == 0x1bd) || (startcode == 0x1fd)))
285 de6d9b64 Fabrice Bellard
        goto redo;
286 27f388aa Fabrice Bellard
    if (ppos) {
287 899681cd Björn Axelsson
        *ppos = url_ftell(s->pb) - 4;
288 27f388aa Fabrice Bellard
    }
289 899681cd Björn Axelsson
    len = get_be16(s->pb);
290 75a9fbb9 Michael Niedermayer
    pts =
291 b2cac184 Fabrice Bellard
    dts = AV_NOPTS_VALUE;
292 de6d9b64 Fabrice Bellard
    /* stuffing */
293
    for(;;) {
294 27f388aa Fabrice Bellard
        if (len < 1)
295 e56cfad0 Michael Niedermayer
            goto error_redo;
296 899681cd Björn Axelsson
        c = get_byte(s->pb);
297 de6d9b64 Fabrice Bellard
        len--;
298
        /* XXX: for mpeg1, should test only bit 7 */
299 115329f1 Diego Biurrun
        if (c != 0xff)
300 de6d9b64 Fabrice Bellard
            break;
301
    }
302
    if ((c & 0xc0) == 0x40) {
303
        /* buffer scale & size */
304 899681cd Björn Axelsson
        get_byte(s->pb);
305
        c = get_byte(s->pb);
306 de6d9b64 Fabrice Bellard
        len -= 2;
307
    }
308 b90ba24b Michael Niedermayer
    if ((c & 0xe0) == 0x20) {
309 899681cd Björn Axelsson
        dts = pts = get_pts(s->pb, c);
310 de6d9b64 Fabrice Bellard
        len -= 4;
311 b90ba24b Michael Niedermayer
        if (c & 0x10){
312 899681cd Björn Axelsson
            dts = get_pts(s->pb, -1);
313 b90ba24b Michael Niedermayer
            len -= 5;
314
        }
315 de6d9b64 Fabrice Bellard
    } else if ((c & 0xc0) == 0x80) {
316
        /* mpeg 2 PES */
317 d8bee8dd Måns Rullgård
#if 0 /* some streams have this field set for no apparent reason */
318 de6d9b64 Fabrice Bellard
        if ((c & 0x30) != 0) {
319 27f388aa Fabrice Bellard
            /* Encrypted multiplex not handled */
320
            goto redo;
321 de6d9b64 Fabrice Bellard
        }
322 d8bee8dd Måns Rullgård
#endif
323 899681cd Björn Axelsson
        flags = get_byte(s->pb);
324
        header_len = get_byte(s->pb);
325 de6d9b64 Fabrice Bellard
        len -= 2;
326
        if (header_len > len)
327 e56cfad0 Michael Niedermayer
            goto error_redo;
328 80036204 Michael Niedermayer
        len -= header_len;
329 b90ba24b Michael Niedermayer
        if (flags & 0x80) {
330 899681cd Björn Axelsson
            dts = pts = get_pts(s->pb, -1);
331 de6d9b64 Fabrice Bellard
            header_len -= 5;
332 b90ba24b Michael Niedermayer
            if (flags & 0x40) {
333 899681cd Björn Axelsson
                dts = get_pts(s->pb, -1);
334 b90ba24b Michael Niedermayer
                header_len -= 5;
335
            }
336 de6d9b64 Fabrice Bellard
        }
337 aad512b4 Michael Niedermayer
        if (flags & 0x01) { /* PES extension */
338 899681cd Björn Axelsson
            pes_ext = get_byte(s->pb);
339 aad512b4 Michael Niedermayer
            header_len--;
340
            if (pes_ext & 0x40) { /* pack header - should be zero in PS */
341
                goto error_redo;
342
            }
343
            /* Skip PES private data, program packet sequence counter and P-STD buffer */
344
            skip = (pes_ext >> 4) & 0xb;
345
            skip += skip & 0x9;
346 899681cd Björn Axelsson
            url_fskip(s->pb, skip);
347 aad512b4 Michael Niedermayer
            header_len -= skip;
348
349
            if (pes_ext & 0x01) { /* PES extension 2 */
350 899681cd Björn Axelsson
                ext2_len = get_byte(s->pb);
351 aad512b4 Michael Niedermayer
                header_len--;
352
                if ((ext2_len & 0x7f) > 0) {
353 899681cd Björn Axelsson
                    id_ext = get_byte(s->pb);
354 aad512b4 Michael Niedermayer
                    if ((id_ext & 0x80) == 0)
355
                        startcode = ((startcode & 0xff) << 8) | id_ext;
356
                    header_len--;
357
                }
358
            }
359
        }
360 80036204 Michael Niedermayer
        if(header_len < 0)
361
            goto error_redo;
362 899681cd Björn Axelsson
        url_fskip(s->pb, header_len);
363 de6d9b64 Fabrice Bellard
    }
364 df70de1f Dmitry Borisov
    else if( c!= 0xf )
365
        goto redo;
366
367 e3d1cd8e Måns Rullgård
    if (startcode == PRIVATE_STREAM_1 && !m->psm_es_type[startcode & 0xff]) {
368 899681cd Björn Axelsson
        startcode = get_byte(s->pb);
369 de6d9b64 Fabrice Bellard
        len--;
370 aad512b4 Michael Niedermayer
        if (startcode >= 0x80 && startcode <= 0xcf) {
371 de6d9b64 Fabrice Bellard
            /* audio: skip header */
372 899681cd Björn Axelsson
            get_byte(s->pb);
373
            get_byte(s->pb);
374
            get_byte(s->pb);
375 de6d9b64 Fabrice Bellard
            len -= 3;
376 aad512b4 Michael Niedermayer
            if (startcode >= 0xb0 && startcode <= 0xbf) {
377
                /* MLP/TrueHD audio has a 4-byte header */
378 899681cd Björn Axelsson
                get_byte(s->pb);
379 aad512b4 Michael Niedermayer
                len--;
380
            }
381 de6d9b64 Fabrice Bellard
        }
382
    }
383 7e4709b1 Michael Niedermayer
    if(len<0)
384
        goto error_redo;
385 b754978a Michael Niedermayer
    if(dts != AV_NOPTS_VALUE && ppos){
386
        int i;
387
        for(i=0; i<s->nb_streams; i++){
388 6ba90c20 Michel Bardiaux
            if(startcode == s->streams[i]->id &&
389
               !url_is_streamed(s->pb) /* index useless on streams anyway */) {
390 3dea63bd Paul Kelly
                ff_reduce_index(s, i);
391 30a43f2d Michael Niedermayer
                av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
392 b754978a Michael Niedermayer
            }
393
        }
394
    }
395 115329f1 Diego Biurrun
396 27f388aa Fabrice Bellard
    *pstart_code = startcode;
397
    *ppts = pts;
398
    *pdts = dts;
399
    return len;
400
}
401
402
static int mpegps_read_packet(AVFormatContext *s,
403
                              AVPacket *pkt)
404
{
405 e3d1cd8e Måns Rullgård
    MpegDemuxContext *m = s->priv_data;
406 27f388aa Fabrice Bellard
    AVStream *st;
407 e3d1cd8e Måns Rullgård
    int len, startcode, i, type, codec_id = 0, es_type;
408 b754978a Michael Niedermayer
    int64_t pts, dts, dummy_pos; //dummy_pos is needed for the index building to work
409 27f388aa Fabrice Bellard
410
 redo:
411 8d14a25c Michael Niedermayer
    len = mpegps_read_pes_header(s, &dummy_pos, &startcode, &pts, &dts);
412 27f388aa Fabrice Bellard
    if (len < 0)
413
        return len;
414 115329f1 Diego Biurrun
415 de6d9b64 Fabrice Bellard
    /* now find stream */
416
    for(i=0;i<s->nb_streams;i++) {
417
        st = s->streams[i];
418
        if (st->id == startcode)
419
            goto found;
420
    }
421 e3d1cd8e Måns Rullgård
422
    es_type = m->psm_es_type[startcode & 0xff];
423
    if(es_type > 0){
424
        if(es_type == STREAM_TYPE_VIDEO_MPEG1){
425
            codec_id = CODEC_ID_MPEG2VIDEO;
426
            type = CODEC_TYPE_VIDEO;
427
        } else if(es_type == STREAM_TYPE_VIDEO_MPEG2){
428
            codec_id = CODEC_ID_MPEG2VIDEO;
429
            type = CODEC_TYPE_VIDEO;
430
        } else if(es_type == STREAM_TYPE_AUDIO_MPEG1 ||
431
                  es_type == STREAM_TYPE_AUDIO_MPEG2){
432
            codec_id = CODEC_ID_MP3;
433
            type = CODEC_TYPE_AUDIO;
434
        } else if(es_type == STREAM_TYPE_AUDIO_AAC){
435
            codec_id = CODEC_ID_AAC;
436
            type = CODEC_TYPE_AUDIO;
437
        } else if(es_type == STREAM_TYPE_VIDEO_MPEG4){
438
            codec_id = CODEC_ID_MPEG4;
439
            type = CODEC_TYPE_VIDEO;
440
        } else if(es_type == STREAM_TYPE_VIDEO_H264){
441
            codec_id = CODEC_ID_H264;
442
            type = CODEC_TYPE_VIDEO;
443
        } else if(es_type == STREAM_TYPE_AUDIO_AC3){
444
            codec_id = CODEC_ID_AC3;
445
            type = CODEC_TYPE_AUDIO;
446
        } else {
447
            goto skip;
448
        }
449
    } else if (startcode >= 0x1e0 && startcode <= 0x1ef) {
450 83d07313 Måns Rullgård
        static const unsigned char avs_seqh[4] = { 0, 0, 1, 0xb0 };
451
        unsigned char buf[8];
452 899681cd Björn Axelsson
        get_buffer(s->pb, buf, 8);
453
        url_fseek(s->pb, -8, SEEK_CUR);
454 83d07313 Måns Rullgård
        if(!memcmp(buf, avs_seqh, 4) && (buf[6] != 0 || buf[7] != 1))
455
            codec_id = CODEC_ID_CAVS;
456
        else
457
            codec_id = CODEC_ID_MPEG2VIDEO;
458 db7f1f95 Fabrice Bellard
        type = CODEC_TYPE_VIDEO;
459
    } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
460
        type = CODEC_TYPE_AUDIO;
461 2c187847 Måns Rullgård
        codec_id = m->sofdec > 0 ? CODEC_ID_ADPCM_ADX : CODEC_ID_MP2;
462 3f2bf07b Joakim Plate
    } else if (startcode >= 0x80 && startcode <= 0x87) {
463 db7f1f95 Fabrice Bellard
        type = CODEC_TYPE_AUDIO;
464
        codec_id = CODEC_ID_AC3;
465 aad512b4 Michael Niedermayer
    } else if ((startcode >= 0x88 && startcode <= 0x8f)
466
               ||( startcode >= 0x98 && startcode <= 0x9f)) {
467
        /* 0x90 - 0x97 is reserved for SDDS in DVD specs */
468 23c99253 Michael Niedermayer
        type = CODEC_TYPE_AUDIO;
469
        codec_id = CODEC_ID_DTS;
470 aad512b4 Michael Niedermayer
    } else if (startcode >= 0xa0 && startcode <= 0xaf) {
471 9ec05e36 Fabrice Bellard
        type = CODEC_TYPE_AUDIO;
472
        codec_id = CODEC_ID_PCM_S16BE;
473 aad512b4 Michael Niedermayer
    } else if (startcode >= 0xb0 && startcode <= 0xbf) {
474
        type = CODEC_TYPE_AUDIO;
475
        codec_id = CODEC_ID_MLP;
476
    } else if (startcode >= 0xc0 && startcode <= 0xcf) {
477
        /* Used for both AC-3 and E-AC-3 in EVOB files */
478
        type = CODEC_TYPE_AUDIO;
479
        codec_id = CODEC_ID_AC3;
480 a9c3213f Fabrice Bellard
    } else if (startcode >= 0x20 && startcode <= 0x3f) {
481
        type = CODEC_TYPE_SUBTITLE;
482
        codec_id = CODEC_ID_DVD_SUBTITLE;
483 aad512b4 Michael Niedermayer
    } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
484
        type = CODEC_TYPE_VIDEO;
485
        codec_id = CODEC_ID_VC1;
486 db7f1f95 Fabrice Bellard
    } else {
487
    skip:
488
        /* skip packet */
489 899681cd Björn Axelsson
        url_fskip(s->pb, len);
490 db7f1f95 Fabrice Bellard
        goto redo;
491
    }
492 1e5c667c Fabrice Bellard
    /* no stream found: add a new stream */
493
    st = av_new_stream(s, startcode);
494 115329f1 Diego Biurrun
    if (!st)
495 1e5c667c Fabrice Bellard
        goto skip;
496 01f4895c Michael Niedermayer
    st->codec->codec_type = type;
497
    st->codec->codec_id = codec_id;
498 27f388aa Fabrice Bellard
    if (codec_id != CODEC_ID_PCM_S16BE)
499 57004ff1 Aurelien Jacobs
        st->need_parsing = AVSTREAM_PARSE_FULL;
500 de6d9b64 Fabrice Bellard
 found:
501 f3356e9c Michael Niedermayer
    if(st->discard >= AVDISCARD_ALL)
502 b9866ebc Michael Niedermayer
        goto skip;
503 aad512b4 Michael Niedermayer
    if (startcode >= 0xa0 && startcode <= 0xaf) {
504 9ec05e36 Fabrice Bellard
        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 899681cd Björn Axelsson
        get_byte(s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
511
        b1 = get_byte(s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
512
        get_byte(s->pb); /* dynamic range control (0x80 = off) */
513 9ec05e36 Fabrice Bellard
        len -= 3;
514
        freq = (b1 >> 4) & 3;
515 01f4895c Michael Niedermayer
        st->codec->sample_rate = lpcm_freq_tab[freq];
516
        st->codec->channels = 1 + (b1 & 7);
517
        st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * 2;
518 9ec05e36 Fabrice Bellard
    }
519 de6d9b64 Fabrice Bellard
    av_new_packet(pkt, len);
520 899681cd Björn Axelsson
    get_buffer(s->pb, pkt->data, pkt->size);
521 de6d9b64 Fabrice Bellard
    pkt->pts = pts;
522 27f388aa Fabrice Bellard
    pkt->dts = dts;
523 db7f1f95 Fabrice Bellard
    pkt->stream_index = st->index;
524 27a206e0 Michel Bardiaux
#if 0
525 b9866ebc Michael Niedermayer
    av_log(s, AV_LOG_DEBUG, "%d: pts=%0.3f dts=%0.3f size=%d\n",
526
           pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0, pkt->size);
527 27a206e0 Michel Bardiaux
#endif
528 0bd586c5 Mike Melanson
529 de6d9b64 Fabrice Bellard
    return 0;
530
}
531
532 db7f1f95 Fabrice Bellard
static int mpegps_read_close(AVFormatContext *s)
533 de6d9b64 Fabrice Bellard
{
534
    return 0;
535
}
536
537 115329f1 Diego Biurrun
static int64_t mpegps_read_dts(AVFormatContext *s, int stream_index,
538 8d14a25c Michael Niedermayer
                               int64_t *ppos, int64_t pos_limit)
539 27f388aa Fabrice Bellard
{
540
    int len, startcode;
541
    int64_t pos, pts, dts;
542
543
    pos = *ppos;
544
#ifdef DEBUG_SEEK
545 949b1a13 Steve L'Homme
    printf("read_dts: pos=0x%"PRIx64" next=%d -> ", pos, find_next);
546 27f388aa Fabrice Bellard
#endif
547 899681cd Björn Axelsson
    url_fseek(s->pb, pos, SEEK_SET);
548 27f388aa Fabrice Bellard
    for(;;) {
549 8d14a25c Michael Niedermayer
        len = mpegps_read_pes_header(s, &pos, &startcode, &pts, &dts);
550 27f388aa Fabrice Bellard
        if (len < 0) {
551
#ifdef DEBUG_SEEK
552
            printf("none (ret=%d)\n", len);
553
#endif
554
            return AV_NOPTS_VALUE;
555
        }
556 115329f1 Diego Biurrun
        if (startcode == s->streams[stream_index]->id &&
557 27f388aa Fabrice Bellard
            dts != AV_NOPTS_VALUE) {
558
            break;
559
        }
560 899681cd Björn Axelsson
        url_fskip(s->pb, len);
561 27f388aa Fabrice Bellard
    }
562
#ifdef DEBUG_SEEK
563 949b1a13 Steve L'Homme
    printf("pos=0x%"PRIx64" dts=0x%"PRIx64" %0.3f\n", pos, dts, dts / 90000.0);
564 27f388aa Fabrice Bellard
#endif
565
    *ppos = pos;
566 cdd5034f Michael Niedermayer
    return dts;
567 27f388aa Fabrice Bellard
}
568
569 d2a067d1 Måns Rullgård
AVInputFormat mpegps_demuxer = {
570 db7f1f95 Fabrice Bellard
    "mpeg",
571
    "MPEG PS format",
572
    sizeof(MpegDemuxContext),
573
    mpegps_probe,
574
    mpegps_read_header,
575
    mpegps_read_packet,
576
    mpegps_read_close,
577 8d14a25c Michael Niedermayer
    NULL, //mpegps_read_seek,
578
    mpegps_read_dts,
579 a9c3213f Fabrice Bellard
    .flags = AVFMT_SHOW_IDS,
580 de6d9b64 Fabrice Bellard
};