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1
/*
2
 * MPEG1/2 mux/demux
3
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9
 *
10
 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
15
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18
 */
19
#include "avformat.h"
20

    
21
#define MAX_PAYLOAD_SIZE 4096
22
#define NB_STREAMS 2
23

    
24
typedef struct {
25
    uint8_t buffer[MAX_PAYLOAD_SIZE];
26
    int buffer_ptr;
27
    uint8_t id;
28
    int max_buffer_size; /* in bytes */
29
    int packet_number;
30
    int64_t start_pts;
31
} StreamInfo;
32

    
33
typedef struct {
34
    int packet_size; /* required packet size */
35
    int packet_data_max_size; /* maximum data size inside a packet */
36
    int packet_number;
37
    int pack_header_freq;     /* frequency (in packets^-1) at which we send pack headers */
38
    int system_header_freq;
39
    int mux_rate; /* bitrate in units of 50 bytes/s */
40
    /* stream info */
41
    int audio_bound;
42
    int video_bound;
43
    int is_mpeg2;
44
    int is_vcd;
45
} MpegMuxContext;
46

    
47
#define PACK_START_CODE             ((unsigned int)0x000001ba)
48
#define SYSTEM_HEADER_START_CODE    ((unsigned int)0x000001bb)
49
#define SEQUENCE_END_CODE           ((unsigned int)0x000001b7)
50
#define PACKET_START_CODE_MASK      ((unsigned int)0xffffff00)
51
#define PACKET_START_CODE_PREFIX    ((unsigned int)0x00000100)
52
#define ISO_11172_END_CODE          ((unsigned int)0x000001b9)
53
  
54
/* mpeg2 */
55
#define PROGRAM_STREAM_MAP 0x1bc
56
#define PRIVATE_STREAM_1   0x1bd
57
#define PADDING_STREAM     0x1be
58
#define PRIVATE_STREAM_2   0x1bf
59

    
60

    
61
#define AUDIO_ID 0xc0
62
#define VIDEO_ID 0xe0
63

    
64
extern AVOutputFormat mpeg1system_mux;
65
extern AVOutputFormat mpeg1vcd_mux;
66
extern AVOutputFormat mpeg2vob_mux;
67

    
68
static int put_pack_header(AVFormatContext *ctx, 
69
                           uint8_t *buf, int64_t timestamp)
70
{
71
    MpegMuxContext *s = ctx->priv_data;
72
    PutBitContext pb;
73
    
74
    init_put_bits(&pb, buf, 128, NULL, NULL);
75

    
76
    put_bits(&pb, 32, PACK_START_CODE);
77
    if (s->is_mpeg2) {
78
        put_bits(&pb, 2, 0x2);
79
    } else {
80
        put_bits(&pb, 4, 0x2);
81
    }
82
    put_bits(&pb, 3, (uint32_t)((timestamp >> 30) & 0x07));
83
    put_bits(&pb, 1, 1);
84
    put_bits(&pb, 15, (uint32_t)((timestamp >> 15) & 0x7fff));
85
    put_bits(&pb, 1, 1);
86
    put_bits(&pb, 15, (uint32_t)((timestamp) & 0x7fff));
87
    put_bits(&pb, 1, 1);
88
    if (s->is_mpeg2) {
89
        /* clock extension */
90
        put_bits(&pb, 9, 0);
91
        put_bits(&pb, 1, 1);
92
    }
93
    put_bits(&pb, 1, 1);
94
    put_bits(&pb, 22, s->mux_rate);
95
    put_bits(&pb, 1, 1);
96
    if (s->is_mpeg2) {
97
        put_bits(&pb, 5, 0x1f); /* reserved */
98
        put_bits(&pb, 3, 0); /* stuffing length */
99
    }
100
    flush_put_bits(&pb);
101
    return pbBufPtr(&pb) - pb.buf;
102
}
103

    
104
static int put_system_header(AVFormatContext *ctx, uint8_t *buf)
105
{
106
    MpegMuxContext *s = ctx->priv_data;
107
    int size, rate_bound, i, private_stream_coded, id;
108
    PutBitContext pb;
109

    
110
    init_put_bits(&pb, buf, 128, NULL, NULL);
111

    
112
    put_bits(&pb, 32, SYSTEM_HEADER_START_CODE);
113
    put_bits(&pb, 16, 0);
114
    put_bits(&pb, 1, 1);
115
    
116
    rate_bound = s->mux_rate; /* maximum bit rate of the multiplexed stream */
117
    put_bits(&pb, 22, rate_bound);
118
    put_bits(&pb, 1, 1); /* marker */
119
    put_bits(&pb, 6, s->audio_bound);
120

    
121
    put_bits(&pb, 1, 1); /* variable bitrate */
122
    put_bits(&pb, 1, 1); /* non constrainted bit stream */
123
    
124
    put_bits(&pb, 1, 0); /* audio locked */
125
    put_bits(&pb, 1, 0); /* video locked */
126
    put_bits(&pb, 1, 1); /* marker */
127

    
128
    put_bits(&pb, 5, s->video_bound);
129
    put_bits(&pb, 8, 0xff); /* reserved byte */
130
    
131
    /* audio stream info */
132
    private_stream_coded = 0;
133
    for(i=0;i<ctx->nb_streams;i++) {
134
        StreamInfo *stream = ctx->streams[i]->priv_data;
135
        id = stream->id;
136
        if (id < 0xc0) {
137
            /* special case for private streams (AC3 use that) */
138
            if (private_stream_coded)
139
                continue;
140
            private_stream_coded = 1;
141
            id = 0xbd;
142
        }
143
        put_bits(&pb, 8, id); /* stream ID */
144
        put_bits(&pb, 2, 3);
145
        if (id < 0xe0) {
146
            /* audio */
147
            put_bits(&pb, 1, 0);
148
            put_bits(&pb, 13, stream->max_buffer_size / 128);
149
        } else {
150
            /* video */
151
            put_bits(&pb, 1, 1);
152
            put_bits(&pb, 13, stream->max_buffer_size / 1024);
153
        }
154
    }
155
    flush_put_bits(&pb);
156
    size = pbBufPtr(&pb) - pb.buf;
157
    /* patch packet size */
158
    buf[4] = (size - 6) >> 8;
159
    buf[5] = (size - 6) & 0xff;
160

    
161
    return size;
162
}
163

    
164
static int mpeg_mux_init(AVFormatContext *ctx)
165
{
166
    MpegMuxContext *s = ctx->priv_data;
167
    int bitrate, i, mpa_id, mpv_id, ac3_id;
168
    AVStream *st;
169
    StreamInfo *stream;
170

    
171
    s->packet_number = 0;
172
    s->is_vcd = (ctx->oformat == &mpeg1vcd_mux);
173
    s->is_mpeg2 = (ctx->oformat == &mpeg2vob_mux);
174
    
175
    if (s->is_vcd)
176
        s->packet_size = 2324; /* VCD packet size */
177
    else
178
        s->packet_size = 2048;
179
        
180
    /* startcode(4) + length(2) + flags(1) */
181
    s->packet_data_max_size = s->packet_size - 7;
182
    s->audio_bound = 0;
183
    s->video_bound = 0;
184
    mpa_id = AUDIO_ID;
185
    ac3_id = 0x80;
186
    mpv_id = VIDEO_ID;
187
    for(i=0;i<ctx->nb_streams;i++) {
188
        st = ctx->streams[i];
189
        stream = av_mallocz(sizeof(StreamInfo));
190
        if (!stream)
191
            goto fail;
192
        st->priv_data = stream;
193

    
194
        switch(st->codec.codec_type) {
195
        case CODEC_TYPE_AUDIO:
196
            if (st->codec.codec_id == CODEC_ID_AC3)
197
                stream->id = ac3_id++;
198
            else
199
                stream->id = mpa_id++;
200
            stream->max_buffer_size = 4 * 1024; 
201
            s->audio_bound++;
202
            break;
203
        case CODEC_TYPE_VIDEO:
204
            stream->id = mpv_id++;
205
            stream->max_buffer_size = 46 * 1024; 
206
            s->video_bound++;
207
            break;
208
        default:
209
            av_abort();
210
        }
211
    }
212

    
213
    /* we increase slightly the bitrate to take into account the
214
       headers. XXX: compute it exactly */
215
    bitrate = 2000;
216
    for(i=0;i<ctx->nb_streams;i++) {
217
        st = ctx->streams[i];
218
        bitrate += st->codec.bit_rate;
219
    }
220
    s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50);
221
    
222
    if (s->is_vcd || s->is_mpeg2)
223
        /* every packet */
224
        s->pack_header_freq = 1;
225
    else
226
        /* every 2 seconds */
227
        s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
228
    
229
    if (s->is_mpeg2)
230
        /* every 200 packets. Need to look at the spec.  */
231
        s->system_header_freq = s->pack_header_freq * 40;
232
    else if (s->is_vcd)
233
        /* every 40 packets, this is my invention */
234
        s->system_header_freq = s->pack_header_freq * 40;
235
    else
236
        s->system_header_freq = s->pack_header_freq * 5;
237
    
238
    for(i=0;i<ctx->nb_streams;i++) {
239
        stream = ctx->streams[i]->priv_data;
240
        stream->buffer_ptr = 0;
241
        stream->packet_number = 0;
242
        stream->start_pts = -1;
243
    }
244
    return 0;
245
 fail:
246
    for(i=0;i<ctx->nb_streams;i++) {
247
        av_free(ctx->streams[i]->priv_data);
248
    }
249
    return -ENOMEM;
250
}
251

    
252
/* flush the packet on stream stream_index */
253
static void flush_packet(AVFormatContext *ctx, int stream_index, int last_pkt)
254
{
255
    MpegMuxContext *s = ctx->priv_data;
256
    StreamInfo *stream = ctx->streams[stream_index]->priv_data;
257
    uint8_t *buf_ptr;
258
    int size, payload_size, startcode, id, len, stuffing_size, i, header_len;
259
    int64_t timestamp;
260
    uint8_t buffer[128];
261
    int last = last_pkt ? 4 : 0;
262
    
263
    id = stream->id;
264
    timestamp = stream->start_pts;
265

    
266
#if 0
267
    printf("packet ID=%2x PTS=%0.3f\n", 
268
           id, timestamp / 90000.0);
269
#endif
270

    
271
    buf_ptr = buffer;
272
    if (((s->packet_number % s->pack_header_freq) == 0)) {
273
        /* output pack and systems header if needed */
274
        size = put_pack_header(ctx, buf_ptr, timestamp);
275
        buf_ptr += size;
276
        if ((s->packet_number % s->system_header_freq) == 0) {
277
            size = put_system_header(ctx, buf_ptr);
278
            buf_ptr += size;
279
        }
280
    }
281
    size = buf_ptr - buffer;
282
    put_buffer(&ctx->pb, buffer, size);
283

    
284
    /* packet header */
285
    if (s->is_mpeg2) {
286
        header_len = 8;
287
    } else {
288
        header_len = 5;
289
    }
290
    payload_size = s->packet_size - (size + 6 + header_len + last);
291
    if (id < 0xc0) {
292
        startcode = PRIVATE_STREAM_1;
293
        payload_size -= 4;
294
    } else {
295
        startcode = 0x100 + id;
296
    }
297
    stuffing_size = payload_size - stream->buffer_ptr;
298
    if (stuffing_size < 0)
299
        stuffing_size = 0;
300

    
301
    put_be32(&ctx->pb, startcode);
302

    
303
    put_be16(&ctx->pb, payload_size + header_len);
304
    /* stuffing */
305
    for(i=0;i<stuffing_size;i++)
306
        put_byte(&ctx->pb, 0xff);
307

    
308
    if (s->is_mpeg2) {
309
        put_byte(&ctx->pb, 0x80); /* mpeg2 id */
310
        put_byte(&ctx->pb, 0x80); /* flags */
311
        put_byte(&ctx->pb, 0x05); /* header len (only pts is included) */
312
    }
313
    put_byte(&ctx->pb, 
314
             (0x02 << 4) | 
315
             (((timestamp >> 30) & 0x07) << 1) | 
316
             1);
317
    put_be16(&ctx->pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
318
    put_be16(&ctx->pb, (uint16_t)((((timestamp) & 0x7fff) << 1) | 1));
319

    
320
    if (startcode == PRIVATE_STREAM_1) {
321
        put_byte(&ctx->pb, id);
322
        if (id >= 0x80 && id <= 0xbf) {
323
            /* XXX: need to check AC3 spec */
324
            put_byte(&ctx->pb, 1);
325
            put_byte(&ctx->pb, 0);
326
            put_byte(&ctx->pb, 2);
327
        }
328
    }
329

    
330
    if (last_pkt) {
331
        put_be32(&ctx->pb, ISO_11172_END_CODE);
332
    }
333
    /* output data */
334
    put_buffer(&ctx->pb, stream->buffer, payload_size - stuffing_size);
335
    put_flush_packet(&ctx->pb);
336
    
337
    /* preserve remaining data */
338
    len = stream->buffer_ptr - payload_size;
339
    if (len < 0) 
340
        len = 0;
341
    memmove(stream->buffer, stream->buffer + stream->buffer_ptr - len, len);
342
    stream->buffer_ptr = len;
343

    
344
    s->packet_number++;
345
    stream->packet_number++;
346
    stream->start_pts = -1;
347
}
348

    
349
static int mpeg_mux_write_packet(AVFormatContext *ctx, int stream_index,
350
                                 uint8_t *buf, int size, int pts)
351
{
352
    MpegMuxContext *s = ctx->priv_data;
353
    AVStream *st = ctx->streams[stream_index];
354
    StreamInfo *stream = st->priv_data;
355
    int len;
356
    
357
    while (size > 0) {
358
        /* set pts */
359
        if (stream->start_pts == -1) {
360
            stream->start_pts = pts;
361
        }
362
        len = s->packet_data_max_size - stream->buffer_ptr;
363
        if (len > size)
364
            len = size;
365
        memcpy(stream->buffer + stream->buffer_ptr, buf, len);
366
        stream->buffer_ptr += len;
367
        buf += len;
368
        size -= len;
369
        while (stream->buffer_ptr >= s->packet_data_max_size) {
370
            /* output the packet */
371
            if (stream->start_pts == -1)
372
                stream->start_pts = pts;
373
            flush_packet(ctx, stream_index, 0);
374
        }
375
    }
376
    return 0;
377
}
378

    
379
static int mpeg_mux_end(AVFormatContext *ctx)
380
{
381
    StreamInfo *stream;
382
    int i;
383

    
384
    /* flush each packet */
385
    for(i=0;i<ctx->nb_streams;i++) {
386
        stream = ctx->streams[i]->priv_data;
387
        if (stream->buffer_ptr > 0) {
388
            if (i == (ctx->nb_streams - 1)) 
389
                flush_packet(ctx, i, 1);
390
            else
391
                flush_packet(ctx, i, 0);
392
        }
393
    }
394

    
395
    /* write the end header */
396
    //put_be32(&ctx->pb, ISO_11172_END_CODE);
397
    //put_flush_packet(&ctx->pb);
398
    return 0;
399
}
400

    
401
/*********************************************/
402
/* demux code */
403

    
404
#define MAX_SYNC_SIZE 100000
405

    
406
static int mpegps_probe(AVProbeData *p)
407
{
408
    int code, c, i;
409
    const uint8_t *d;
410

    
411
    code = 0xff;
412
    /* we search the first start code. If it is a packet start code,
413
       then we decide it is mpeg ps. We do not send highest value to
414
       give a chance to mpegts */
415
    /* NOTE: the search range was restricted to avoid too many false
416
       detections */
417

    
418
    if (p->buf_size < 6)
419
        return 0;
420

    
421
    for (i = 0; i < 20; i++) {
422
        c = p->buf[i];
423
        code = (code << 8) | c;
424
        if ((code & 0xffffff00) == 0x100) {
425
            if (code == PACK_START_CODE ||
426
                code == SYSTEM_HEADER_START_CODE ||
427
                (code >= 0x1e0 && code <= 0x1ef) ||
428
                (code >= 0x1c0 && code <= 0x1df) ||
429
                code == PRIVATE_STREAM_2 ||
430
                code == PROGRAM_STREAM_MAP ||
431
                code == PRIVATE_STREAM_1 ||
432
                code == PADDING_STREAM)
433
                return AVPROBE_SCORE_MAX - 1;
434
            else
435
                return 0;
436
        }
437
    }
438
    return 0;
439
}
440

    
441

    
442
typedef struct MpegDemuxContext {
443
    int header_state;
444
} MpegDemuxContext;
445

    
446
static int find_start_code(ByteIOContext *pb, int *size_ptr, 
447
                           uint32_t *header_state)
448
{
449
    unsigned int state, v;
450
    int val, n;
451

    
452
    state = *header_state;
453
    n = *size_ptr;
454
    while (n > 0) {
455
        if (url_feof(pb))
456
            break;
457
        v = get_byte(pb);
458
        n--;
459
        if (state == 0x000001) {
460
            state = ((state << 8) | v) & 0xffffff;
461
            val = state;
462
            goto found;
463
        }
464
        state = ((state << 8) | v) & 0xffffff;
465
    }
466
    val = -1;
467
 found:
468
    *header_state = state;
469
    *size_ptr = n;
470
    return val;
471
}
472

    
473
static int mpegps_read_header(AVFormatContext *s,
474
                                  AVFormatParameters *ap)
475
{
476
    MpegDemuxContext *m = s->priv_data;
477
    m->header_state = 0xff;
478
    /* no need to do more */
479
    return 0;
480
}
481

    
482
static int64_t get_pts(ByteIOContext *pb, int c)
483
{
484
    int64_t pts;
485
    int val;
486

    
487
    if (c < 0)
488
        c = get_byte(pb);
489
    pts = (int64_t)((c >> 1) & 0x07) << 30;
490
    val = get_be16(pb);
491
    pts |= (int64_t)(val >> 1) << 15;
492
    val = get_be16(pb);
493
    pts |= (int64_t)(val >> 1);
494
    return pts;
495
}
496

    
497
static int mpegps_read_packet(AVFormatContext *s,
498
                                  AVPacket *pkt)
499
{
500
    MpegDemuxContext *m = s->priv_data;
501
    AVStream *st;
502
    int len, size, startcode, i, c, flags, header_len, type, codec_id;
503
    int64_t pts, dts;
504

    
505
    /* next start code (should be immediately after) */
506
 redo:
507
    m->header_state = 0xff;
508
    size = MAX_SYNC_SIZE;
509
    startcode = find_start_code(&s->pb, &size, &m->header_state);
510
    //printf("startcode=%x pos=0x%Lx\n", startcode, url_ftell(&s->pb));
511
    if (startcode < 0)
512
        return -EIO;
513
    if (startcode == PACK_START_CODE)
514
        goto redo;
515
    if (startcode == SYSTEM_HEADER_START_CODE)
516
        goto redo;
517
    if (startcode == PADDING_STREAM ||
518
        startcode == PRIVATE_STREAM_2) {
519
        /* skip them */
520
        len = get_be16(&s->pb);
521
        url_fskip(&s->pb, len);
522
        goto redo;
523
    }
524
    /* find matching stream */
525
    if (!((startcode >= 0x1c0 && startcode <= 0x1df) ||
526
          (startcode >= 0x1e0 && startcode <= 0x1ef) ||
527
          (startcode == 0x1bd)))
528
        goto redo;
529

    
530
    len = get_be16(&s->pb);
531
    pts = AV_NOPTS_VALUE;
532
    dts = AV_NOPTS_VALUE;
533
    /* stuffing */
534
    for(;;) {
535
        c = get_byte(&s->pb);
536
        len--;
537
        /* XXX: for mpeg1, should test only bit 7 */
538
        if (c != 0xff) 
539
            break;
540
    }
541
    if ((c & 0xc0) == 0x40) {
542
        /* buffer scale & size */
543
        get_byte(&s->pb);
544
        c = get_byte(&s->pb);
545
        len -= 2;
546
    }
547
    if ((c & 0xf0) == 0x20) {
548
        pts = get_pts(&s->pb, c);
549
        len -= 4;
550
    } else if ((c & 0xf0) == 0x30) {
551
        pts = get_pts(&s->pb, c);
552
        dts = get_pts(&s->pb, -1);
553
        len -= 9;
554
    } else if ((c & 0xc0) == 0x80) {
555
        /* mpeg 2 PES */
556
        if ((c & 0x30) != 0) {
557
            fprintf(stderr, "Encrypted multiplex not handled\n");
558
            return -EIO;
559
        }
560
        flags = get_byte(&s->pb);
561
        header_len = get_byte(&s->pb);
562
        len -= 2;
563
        if (header_len > len)
564
            goto redo;
565
        if ((flags & 0xc0) == 0x80) {
566
            pts = get_pts(&s->pb, -1);
567
            header_len -= 5;
568
            len -= 5;
569
        } if ((flags & 0xc0) == 0xc0) {
570
            pts = get_pts(&s->pb, -1);
571
            dts = get_pts(&s->pb, -1);
572
            header_len -= 10;
573
            len -= 10;
574
        }
575
        len -= header_len;
576
        while (header_len > 0) {
577
            get_byte(&s->pb);
578
            header_len--;
579
        }
580
    }
581
    if (startcode == 0x1bd) {
582
        startcode = get_byte(&s->pb);
583
        len--;
584
        if (startcode >= 0x80 && startcode <= 0xbf) {
585
            /* audio: skip header */
586
            get_byte(&s->pb);
587
            get_byte(&s->pb);
588
            get_byte(&s->pb);
589
            len -= 3;
590
        }
591
    }
592

    
593
    /* now find stream */
594
    for(i=0;i<s->nb_streams;i++) {
595
        st = s->streams[i];
596
        if (st->id == startcode)
597
            goto found;
598
    }
599
    if (startcode >= 0x1e0 && startcode <= 0x1ef) {
600
        type = CODEC_TYPE_VIDEO;
601
        codec_id = CODEC_ID_MPEG1VIDEO;
602
    } else if (startcode >= 0x1c0 && startcode <= 0x1df) {
603
        type = CODEC_TYPE_AUDIO;
604
        codec_id = CODEC_ID_MP2;
605
    } else if (startcode >= 0x80 && startcode <= 0x9f) {
606
        type = CODEC_TYPE_AUDIO;
607
        codec_id = CODEC_ID_AC3;
608
    } else if (startcode >= 0xa0 && startcode <= 0xbf) {
609
        type = CODEC_TYPE_AUDIO;
610
        codec_id = CODEC_ID_PCM_S16BE;
611
    } else {
612
    skip:
613
        /* skip packet */
614
        url_fskip(&s->pb, len);
615
        goto redo;
616
    }
617
    /* no stream found: add a new stream */
618
    st = av_new_stream(s, startcode);
619
    if (!st) 
620
        goto skip;
621
    st->codec.codec_type = type;
622
    st->codec.codec_id = codec_id;
623
 found:
624
    if (startcode >= 0xa0 && startcode <= 0xbf) {
625
        int b1, freq;
626
        static const int lpcm_freq_tab[4] = { 48000, 96000, 44100, 32000 };
627

    
628
        /* for LPCM, we just skip the header and consider it is raw
629
           audio data */
630
        if (len <= 3)
631
            goto skip;
632
        get_byte(&s->pb); /* emphasis (1), muse(1), reserved(1), frame number(5) */
633
        b1 = get_byte(&s->pb); /* quant (2), freq(2), reserved(1), channels(3) */
634
        get_byte(&s->pb); /* dynamic range control (0x80 = off) */
635
        len -= 3;
636
        freq = (b1 >> 4) & 3;
637
        st->codec.sample_rate = lpcm_freq_tab[freq];
638
        st->codec.channels = 1 + (b1 & 7);
639
        st->codec.bit_rate = st->codec.channels * st->codec.sample_rate * 2;
640
    }
641
    av_new_packet(pkt, len);
642
    //printf("\nRead Packet ID: %x PTS: %f Size: %d", startcode,
643
    //       (float)pts/90000, len);
644
    get_buffer(&s->pb, pkt->data, pkt->size);
645
    pkt->pts = pts;
646
    pkt->stream_index = st->index;
647
    return 0;
648
}
649

    
650
static int mpegps_read_close(AVFormatContext *s)
651
{
652
    return 0;
653
}
654

    
655
static AVOutputFormat mpeg1system_mux = {
656
    "mpeg",
657
    "MPEG1 System format",
658
    "video/mpeg",
659
    "mpg,mpeg",
660
    sizeof(MpegMuxContext),
661
    CODEC_ID_MP2,
662
    CODEC_ID_MPEG1VIDEO,
663
    mpeg_mux_init,
664
    mpeg_mux_write_packet,
665
    mpeg_mux_end,
666
};
667

    
668
static AVOutputFormat mpeg1vcd_mux = {
669
    "vcd",
670
    "MPEG1 System format (VCD)",
671
    "video/mpeg",
672
    NULL,
673
    sizeof(MpegMuxContext),
674
    CODEC_ID_MP2,
675
    CODEC_ID_MPEG1VIDEO,
676
    mpeg_mux_init,
677
    mpeg_mux_write_packet,
678
    mpeg_mux_end,
679
};
680

    
681
static AVOutputFormat mpeg2vob_mux = {
682
    "vob",
683
    "MPEG2 PS format (VOB)",
684
    "video/mpeg",
685
    "vob",
686
    sizeof(MpegMuxContext),
687
    CODEC_ID_MP2,
688
    CODEC_ID_MPEG1VIDEO,
689
    mpeg_mux_init,
690
    mpeg_mux_write_packet,
691
    mpeg_mux_end,
692
};
693

    
694
static AVInputFormat mpegps_demux = {
695
    "mpeg",
696
    "MPEG PS format",
697
    sizeof(MpegDemuxContext),
698
    mpegps_probe,
699
    mpegps_read_header,
700
    mpegps_read_packet,
701
    mpegps_read_close,
702
    .flags = AVFMT_NOHEADER,
703
};
704

    
705
int mpegps_init(void)
706
{
707
    av_register_output_format(&mpeg1system_mux);
708
    av_register_output_format(&mpeg1vcd_mux);
709
    av_register_output_format(&mpeg2vob_mux);
710
    av_register_input_format(&mpegps_demux);
711
    return 0;
712
}