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ffmpeg / libavformat / rmdec.c @ 0a5790d1

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1
/*
2
 * "Real" compatible demuxer.
3
 * Copyright (c) 2000, 2001 Fabrice Bellard.
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21
#include "avformat.h"
22
#include "rm.h"
23
#include "avstring.h"
24

    
25
static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
26
{
27
    int i;
28
    char *q, r;
29

    
30
    q = buf;
31
    for(i=0;i<len;i++) {
32
        r = get_byte(pb);
33
        if (i < buf_size - 1)
34
            *q++ = r;
35
    }
36
    if (buf_size > 0) *q = '\0';
37
}
38

    
39
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
40
{
41
    get_strl(pb, buf, buf_size, get_be16(pb));
42
}
43

    
44
static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
45
{
46
    get_strl(pb, buf, buf_size, get_byte(pb));
47
}
48

    
49
static int rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,
50
                                      int read_all)
51
{
52
    RMContext *rm = s->priv_data;
53
    ByteIOContext *pb = &s->pb;
54
    char buf[256];
55
    uint32_t version;
56
    int i;
57

    
58
    /* ra type header */
59
    version = get_be32(pb); /* version */
60
    if (((version >> 16) & 0xff) == 3) {
61
        int64_t startpos = url_ftell(pb);
62
        /* very old version */
63
        for(i = 0; i < 14; i++)
64
            get_byte(pb);
65
        get_str8(pb, s->title, sizeof(s->title));
66
        get_str8(pb, s->author, sizeof(s->author));
67
        get_str8(pb, s->copyright, sizeof(s->copyright));
68
        get_str8(pb, s->comment, sizeof(s->comment));
69
        if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
70
        // fourcc (should always be "lpcJ")
71
        get_byte(pb);
72
        get_str8(pb, buf, sizeof(buf));
73
        }
74
        // Skip extra header crap (this should never happen)
75
        if ((startpos + (version & 0xffff)) > url_ftell(pb))
76
            url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
77
        st->codec->sample_rate = 8000;
78
        st->codec->channels = 1;
79
        st->codec->codec_type = CODEC_TYPE_AUDIO;
80
        st->codec->codec_id = CODEC_ID_RA_144;
81
    } else {
82
        int flavor, sub_packet_h, coded_framesize, sub_packet_size;
83
        /* old version (4) */
84
        get_be32(pb); /* .ra4 */
85
        get_be32(pb); /* data size */
86
        get_be16(pb); /* version2 */
87
        get_be32(pb); /* header size */
88
        flavor= get_be16(pb); /* add codec info / flavor */
89
        rm->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
90
        get_be32(pb); /* ??? */
91
        get_be32(pb); /* ??? */
92
        get_be32(pb); /* ??? */
93
        rm->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
94
        st->codec->block_align= get_be16(pb); /* frame size */
95
        rm->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
96
        get_be16(pb); /* ??? */
97
        if (((version >> 16) & 0xff) == 5) {
98
            get_be16(pb); get_be16(pb); get_be16(pb); }
99
        st->codec->sample_rate = get_be16(pb);
100
        get_be32(pb);
101
        st->codec->channels = get_be16(pb);
102
        if (((version >> 16) & 0xff) == 5) {
103
            get_be32(pb);
104
            buf[0] = get_byte(pb);
105
            buf[1] = get_byte(pb);
106
            buf[2] = get_byte(pb);
107
            buf[3] = get_byte(pb);
108
            buf[4] = 0;
109
        } else {
110
            get_str8(pb, buf, sizeof(buf)); /* desc */
111
            get_str8(pb, buf, sizeof(buf)); /* desc */
112
        }
113
        st->codec->codec_type = CODEC_TYPE_AUDIO;
114
        if (!strcmp(buf, "dnet")) {
115
            st->codec->codec_id = CODEC_ID_AC3;
116
        } else if (!strcmp(buf, "28_8")) {
117
            st->codec->codec_id = CODEC_ID_RA_288;
118
            st->codec->extradata_size= 0;
119
            rm->audio_framesize = st->codec->block_align;
120
            st->codec->block_align = coded_framesize;
121

    
122
            if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
123
                av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
124
                return -1;
125
            }
126

    
127
            rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
128
        } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc"))) {
129
            int codecdata_length, i;
130
            get_be16(pb); get_byte(pb);
131
            if (((version >> 16) & 0xff) == 5)
132
                get_byte(pb);
133
            codecdata_length = get_be32(pb);
134
            if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
135
                av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
136
                return -1;
137
            }
138

    
139
            if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
140
            else st->codec->codec_id = CODEC_ID_ATRAC3;
141
            st->codec->extradata_size= codecdata_length;
142
            st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
143
            for(i = 0; i < codecdata_length; i++)
144
                ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
145
            rm->audio_framesize = st->codec->block_align;
146
            st->codec->block_align = rm->sub_packet_size;
147

    
148
            if(rm->audio_framesize >= UINT_MAX / sub_packet_h){
149
                av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
150
                return -1;
151
            }
152

    
153
            rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);
154
        } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
155
            int codecdata_length, i;
156
            get_be16(pb); get_byte(pb);
157
            if (((version >> 16) & 0xff) == 5)
158
                get_byte(pb);
159
            st->codec->codec_id = CODEC_ID_AAC;
160
            codecdata_length = get_be32(pb);
161
            if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
162
                av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
163
                return -1;
164
            }
165
            if (codecdata_length >= 1) {
166
                st->codec->extradata_size = codecdata_length - 1;
167
                st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
168
                get_byte(pb);
169
                for(i = 0; i < st->codec->extradata_size; i++)
170
                    ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);
171
            }
172
        } else {
173
            st->codec->codec_id = CODEC_ID_NONE;
174
            av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
175
        }
176
        if (read_all) {
177
            get_byte(pb);
178
            get_byte(pb);
179
            get_byte(pb);
180

    
181
            get_str8(pb, s->title, sizeof(s->title));
182
            get_str8(pb, s->author, sizeof(s->author));
183
            get_str8(pb, s->copyright, sizeof(s->copyright));
184
            get_str8(pb, s->comment, sizeof(s->comment));
185
        }
186
    }
187
    return 0;
188
}
189

    
190
static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
191
{
192
    RMContext *rm = s->priv_data;
193
    AVStream *st;
194

    
195
    rm->old_format = 1;
196
    st = av_new_stream(s, 0);
197
    if (!st)
198
        return -1;
199
    return rm_read_audio_stream_info(s, st, 1);
200
}
201

    
202
static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
203
{
204
    RMContext *rm = s->priv_data;
205
    AVStream *st;
206
    ByteIOContext *pb = &s->pb;
207
    unsigned int tag, v;
208
    int tag_size, size, codec_data_size, i;
209
    int64_t codec_pos;
210
    unsigned int start_time, duration;
211
    char buf[128];
212
    int flags = 0;
213

    
214
    tag = get_le32(pb);
215
    if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
216
        /* very old .ra format */
217
        return rm_read_header_old(s, ap);
218
    } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
219
        return AVERROR(EIO);
220
    }
221

    
222
    get_be32(pb); /* header size */
223
    get_be16(pb);
224
    get_be32(pb);
225
    get_be32(pb); /* number of headers */
226

    
227
    for(;;) {
228
        if (url_feof(pb))
229
            goto fail;
230
        tag = get_le32(pb);
231
        tag_size = get_be32(pb);
232
        get_be16(pb);
233
#if 0
234
        printf("tag=%c%c%c%c (%08x) size=%d\n",
235
               (tag) & 0xff,
236
               (tag >> 8) & 0xff,
237
               (tag >> 16) & 0xff,
238
               (tag >> 24) & 0xff,
239
               tag,
240
               tag_size);
241
#endif
242
        if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
243
            goto fail;
244
        switch(tag) {
245
        case MKTAG('P', 'R', 'O', 'P'):
246
            /* file header */
247
            get_be32(pb); /* max bit rate */
248
            get_be32(pb); /* avg bit rate */
249
            get_be32(pb); /* max packet size */
250
            get_be32(pb); /* avg packet size */
251
            get_be32(pb); /* nb packets */
252
            get_be32(pb); /* duration */
253
            get_be32(pb); /* preroll */
254
            get_be32(pb); /* index offset */
255
            get_be32(pb); /* data offset */
256
            get_be16(pb); /* nb streams */
257
            flags = get_be16(pb); /* flags */
258
            break;
259
        case MKTAG('C', 'O', 'N', 'T'):
260
            get_str16(pb, s->title, sizeof(s->title));
261
            get_str16(pb, s->author, sizeof(s->author));
262
            get_str16(pb, s->copyright, sizeof(s->copyright));
263
            get_str16(pb, s->comment, sizeof(s->comment));
264
            break;
265
        case MKTAG('M', 'D', 'P', 'R'):
266
            st = av_new_stream(s, 0);
267
            if (!st)
268
                goto fail;
269
            st->id = get_be16(pb);
270
            get_be32(pb); /* max bit rate */
271
            st->codec->bit_rate = get_be32(pb); /* bit rate */
272
            get_be32(pb); /* max packet size */
273
            get_be32(pb); /* avg packet size */
274
            start_time = get_be32(pb); /* start time */
275
            get_be32(pb); /* preroll */
276
            duration = get_be32(pb); /* duration */
277
            st->start_time = start_time;
278
            st->duration = duration;
279
            get_str8(pb, buf, sizeof(buf)); /* desc */
280
            get_str8(pb, buf, sizeof(buf)); /* mimetype */
281
            codec_data_size = get_be32(pb);
282
            codec_pos = url_ftell(pb);
283
            st->codec->codec_type = CODEC_TYPE_DATA;
284
            av_set_pts_info(st, 64, 1, 1000);
285

    
286
            v = get_be32(pb);
287
            if (v == MKTAG(0xfd, 'a', 'r', '.')) {
288
                /* ra type header */
289
                if (rm_read_audio_stream_info(s, st, 0))
290
                    return -1;
291
            } else {
292
                int fps, fps2;
293
                if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
294
                fail1:
295
                    av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
296
                    goto skip;
297
                }
298
                st->codec->codec_tag = get_le32(pb);
299
//                av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
300
                if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
301
                    && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
302
                    && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
303
                    && st->codec->codec_tag != MKTAG('R', 'V', '4', '0'))
304
                    goto fail1;
305
                st->codec->width = get_be16(pb);
306
                st->codec->height = get_be16(pb);
307
                st->codec->time_base.num= 1;
308
                fps= get_be16(pb);
309
                st->codec->codec_type = CODEC_TYPE_VIDEO;
310
                get_be32(pb);
311
                fps2= get_be16(pb);
312
                get_be16(pb);
313

    
314
                st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
315

    
316
                if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
317
                    //check is redundant as get_buffer() will catch this
318
                    av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
319
                    return -1;
320
                }
321
                st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
322
                get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
323

    
324
//                av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
325
                st->codec->time_base.den = fps * st->codec->time_base.num;
326
                switch(((uint8_t*)st->codec->extradata)[4]>>4){
327
                case 1: st->codec->codec_id = CODEC_ID_RV10; break;
328
                case 2: st->codec->codec_id = CODEC_ID_RV20; break;
329
                case 3: st->codec->codec_id = CODEC_ID_RV30; break;
330
                case 4: st->codec->codec_id = CODEC_ID_RV40; break;
331
                default: goto fail1;
332
                }
333
            }
334
skip:
335
            /* skip codec info */
336
            size = url_ftell(pb) - codec_pos;
337
            url_fskip(pb, codec_data_size - size);
338
            break;
339
        case MKTAG('D', 'A', 'T', 'A'):
340
            goto header_end;
341
        default:
342
            /* unknown tag: skip it */
343
            url_fskip(pb, tag_size - 10);
344
            break;
345
        }
346
    }
347
 header_end:
348
    rm->nb_packets = get_be32(pb); /* number of packets */
349
    if (!rm->nb_packets && (flags & 4))
350
        rm->nb_packets = 3600 * 25;
351
    get_be32(pb); /* next data header */
352
    return 0;
353

    
354
 fail:
355
    for(i=0;i<s->nb_streams;i++) {
356
        av_free(s->streams[i]);
357
    }
358
    return AVERROR(EIO);
359
}
360

    
361
static int get_num(ByteIOContext *pb, int *len)
362
{
363
    int n, n1;
364

    
365
    n = get_be16(pb);
366
    (*len)-=2;
367
    if (n >= 0x4000) {
368
        return n - 0x4000;
369
    } else {
370
        n1 = get_be16(pb);
371
        (*len)-=2;
372
        return (n << 16) | n1;
373
    }
374
}
375

    
376
/* multiple of 20 bytes for ra144 (ugly) */
377
#define RAW_PACKET_SIZE 1000
378

    
379
static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
380
    RMContext *rm = s->priv_data;
381
    ByteIOContext *pb = &s->pb;
382
    int len, num, res, i;
383
    AVStream *st;
384
    uint32_t state=0xFFFFFFFF;
385

    
386
    while(!url_feof(pb)){
387
        *pos= url_ftell(pb);
388
        if(rm->remaining_len > 0){
389
            num= rm->current_stream;
390
            len= rm->remaining_len;
391
            *timestamp = AV_NOPTS_VALUE;
392
            *flags= 0;
393
        }else{
394
            state= (state<<8) + get_byte(pb);
395

    
396
            if(state == MKBETAG('I', 'N', 'D', 'X')){
397
                len = get_be16(pb) - 6;
398
                if(len<0)
399
                    continue;
400
                goto skip;
401
            }
402

    
403
            if(state > (unsigned)0xFFFF || state < 12)
404
                continue;
405
            len=state;
406
            state= 0xFFFFFFFF;
407

    
408
            num = get_be16(pb);
409
            *timestamp = get_be32(pb);
410
            res= get_byte(pb); /* reserved */
411
            *flags = get_byte(pb); /* flags */
412

    
413

    
414
            len -= 12;
415
        }
416
        for(i=0;i<s->nb_streams;i++) {
417
            st = s->streams[i];
418
            if (num == st->id)
419
                break;
420
        }
421
        if (i == s->nb_streams) {
422
skip:
423
            /* skip packet if unknown number */
424
            url_fskip(pb, len);
425
            rm->remaining_len -= len;
426
            continue;
427
        }
428
        *stream_index= i;
429

    
430
        return len;
431
    }
432
    return -1;
433
}
434

    
435
static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
436
{
437
    RMContext *rm = s->priv_data;
438
    ByteIOContext *pb = &s->pb;
439
    AVStream *st;
440
    int i, len, j;
441
    int64_t timestamp, pos;
442
    uint8_t *ptr;
443
    int flags;
444

    
445
    if (rm->audio_pkt_cnt) {
446
        // If there are queued audio packet return them first
447
        st = s->streams[rm->audio_stream_num];
448
        if (st->codec->codec_id == CODEC_ID_AAC)
449
            av_get_packet(pb, pkt, rm->sub_packet_lengths[rm->sub_packet_cnt - rm->audio_pkt_cnt]);
450
        else {
451
        av_new_packet(pkt, st->codec->block_align);
452
        memcpy(pkt->data, rm->audiobuf + st->codec->block_align *
453
               (rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
454
               st->codec->block_align);
455
        }
456
        rm->audio_pkt_cnt--;
457
        pkt->flags = 0;
458
        pkt->stream_index = rm->audio_stream_num;
459
    } else if (rm->old_format) {
460
        st = s->streams[0];
461
        if (st->codec->codec_id == CODEC_ID_RA_288) {
462
            int x, y;
463

    
464
            for (y = 0; y < rm->sub_packet_h; y++)
465
                for (x = 0; x < rm->sub_packet_h/2; x++)
466
                    if (get_buffer(pb, rm->audiobuf+x*2*rm->audio_framesize+y*rm->coded_framesize, rm->coded_framesize) <= 0)
467
                        return AVERROR(EIO);
468
            rm->audio_stream_num = 0;
469
            rm->audio_pkt_cnt = rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - 1;
470
            // Release first audio packet
471
            av_new_packet(pkt, st->codec->block_align);
472
            memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
473
            pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
474
            pkt->stream_index = 0;
475
        } else {
476
            /* just read raw bytes */
477
            len = RAW_PACKET_SIZE;
478
            len= av_get_packet(pb, pkt, len);
479
            pkt->stream_index = 0;
480
            if (len <= 0) {
481
                return AVERROR(EIO);
482
            }
483
            pkt->size = len;
484
        }
485
    } else {
486
        int seq=1;
487
resync:
488
        len=sync(s, &timestamp, &flags, &i, &pos);
489
        if(len<0)
490
            return AVERROR(EIO);
491
        st = s->streams[i];
492

    
493
        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
494
            int h, pic_num, len2, pos;
495

    
496
            h= get_byte(pb); len--;
497
            if(!(h & 0x40)){
498
                seq = get_byte(pb); len--;
499
            }
500

    
501
            if((h & 0xc0) == 0x40){
502
                len2= pos= 0;
503
            }else{
504
                len2 = get_num(pb, &len);
505
                pos = get_num(pb, &len);
506
            }
507
            /* picture number */
508
            pic_num= get_byte(pb); len--;
509
            rm->remaining_len= len;
510
            rm->current_stream= st->id;
511

    
512
//            av_log(NULL, AV_LOG_DEBUG, "%X len:%d pos:%d len2:%d pic_num:%d\n",h, len, pos, len2, pic_num);
513
            if(len2 && len2<len)
514
                len=len2;
515
            rm->remaining_len-= len;
516
            av_get_packet(pb, pkt, len);
517

    
518
        } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
519
            if ((st->codec->codec_id == CODEC_ID_RA_288) ||
520
                (st->codec->codec_id == CODEC_ID_COOK) ||
521
                (st->codec->codec_id == CODEC_ID_ATRAC3)) {
522
                int x;
523
                int sps = rm->sub_packet_size;
524
                int cfs = rm->coded_framesize;
525
                int h = rm->sub_packet_h;
526
                int y = rm->sub_packet_cnt;
527
                int w = rm->audio_framesize;
528

    
529
                if (flags & 2)
530
                    y = rm->sub_packet_cnt = 0;
531
                if (!y)
532
                    rm->audiotimestamp = timestamp;
533

    
534
                switch(st->codec->codec_id) {
535
                    case CODEC_ID_RA_288:
536
                        for (x = 0; x < h/2; x++)
537
                            get_buffer(pb, rm->audiobuf+x*2*w+y*cfs, cfs);
538
                        break;
539
                    case CODEC_ID_ATRAC3:
540
                    case CODEC_ID_COOK:
541
                        for (x = 0; x < w/sps; x++)
542
                            get_buffer(pb, rm->audiobuf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
543
                        break;
544
                }
545

    
546
                if (++(rm->sub_packet_cnt) < h)
547
                    goto resync;
548
                else {
549
                    rm->sub_packet_cnt = 0;
550
                    rm->audio_stream_num = i;
551
                    rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;
552
                    // Release first audio packet
553
                    av_new_packet(pkt, st->codec->block_align);
554
                    memcpy(pkt->data, rm->audiobuf, st->codec->block_align);
555
                    timestamp = rm->audiotimestamp;
556
                    flags = 2; // Mark first packet as keyframe
557
                }
558
            } else if (st->codec->codec_id == CODEC_ID_AAC) {
559
                int x;
560
                rm->audio_stream_num = i;
561
                rm->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
562
                if (rm->sub_packet_cnt) {
563
                    for (x = 0; x < rm->sub_packet_cnt; x++)
564
                        rm->sub_packet_lengths[x] = get_be16(pb);
565
                    // Release first audio packet
566
                    rm->audio_pkt_cnt = rm->sub_packet_cnt - 1;
567
                    av_get_packet(pb, pkt, rm->sub_packet_lengths[0]);
568
                    flags = 2; // Mark first packet as keyframe
569
                }
570
            } else
571
                av_get_packet(pb, pkt, len);
572

    
573
        } else
574
            av_get_packet(pb, pkt, len);
575

    
576
        if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
577
           || st->discard >= AVDISCARD_ALL){
578
            av_free_packet(pkt);
579
            goto resync;
580
        }
581

    
582
        pkt->stream_index = i;
583

    
584
#if 0
585
        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
586
            if(st->codec->codec_id == CODEC_ID_RV20){
587
                int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
588
                av_log(NULL, AV_LOG_DEBUG, "%d %"PRId64" %d\n", timestamp, timestamp*512LL/25, seq);
589

590
                seq |= (timestamp&~0x3FFF);
591
                if(seq - timestamp >  0x2000) seq -= 0x4000;
592
                if(seq - timestamp < -0x2000) seq += 0x4000;
593
            }
594
        }
595
#endif
596
        pkt->pts= timestamp;
597
        if(flags&2){
598
            pkt->flags |= PKT_FLAG_KEY;
599
            if((seq&0x7F) == 1)
600
                av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
601
        }
602
    }
603

    
604
    /* for AC3, needs to swap bytes */
605
    if (st->codec->codec_id == CODEC_ID_AC3) {
606
        ptr = pkt->data;
607
        for(j=0;j<pkt->size;j+=2) {
608
            FFSWAP(int, ptr[0], ptr[1]);
609
            ptr += 2;
610
        }
611
    }
612
    return 0;
613
}
614

    
615
static int rm_read_close(AVFormatContext *s)
616
{
617
    RMContext *rm = s->priv_data;
618

    
619
    av_free(rm->audiobuf);
620
    return 0;
621
}
622

    
623
static int rm_probe(AVProbeData *p)
624
{
625
    /* check file header */
626
    if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
627
         p->buf[2] == 'M' && p->buf[3] == 'F' &&
628
         p->buf[4] == 0 && p->buf[5] == 0) ||
629
        (p->buf[0] == '.' && p->buf[1] == 'r' &&
630
         p->buf[2] == 'a' && p->buf[3] == 0xfd))
631
        return AVPROBE_SCORE_MAX;
632
    else
633
        return 0;
634
}
635

    
636
static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
637
                               int64_t *ppos, int64_t pos_limit)
638
{
639
    RMContext *rm = s->priv_data;
640
    int64_t pos, dts;
641
    int stream_index2, flags, len, h;
642

    
643
    pos = *ppos;
644

    
645
    if(rm->old_format)
646
        return AV_NOPTS_VALUE;
647

    
648
    url_fseek(&s->pb, pos, SEEK_SET);
649
    rm->remaining_len=0;
650
    for(;;){
651
        int seq=1;
652
        AVStream *st;
653

    
654
        len=sync(s, &dts, &flags, &stream_index2, &pos);
655
        if(len<0)
656
            return AV_NOPTS_VALUE;
657

    
658
        st = s->streams[stream_index2];
659
        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
660
            h= get_byte(&s->pb); len--;
661
            if(!(h & 0x40)){
662
                seq = get_byte(&s->pb); len--;
663
            }
664
        }
665

    
666
        if((flags&2) && (seq&0x7F) == 1){
667
//            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
668
            av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
669
            if(stream_index2 == stream_index)
670
                break;
671
        }
672

    
673
        url_fskip(&s->pb, len);
674
    }
675
    *ppos = pos;
676
    return dts;
677
}
678

    
679
AVInputFormat rm_demuxer = {
680
    "rm",
681
    "rm format",
682
    sizeof(RMContext),
683
    rm_probe,
684
    rm_read_header,
685
    rm_read_packet,
686
    rm_read_close,
687
    NULL,
688
    rm_read_dts,
689
};