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ffmpeg / libavformat / rmdec.c @ 508fe07a

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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

    
22
#include "libavutil/avstring.h"
23
#include "libavutil/intreadwrite.h"
24
#include "avformat.h"
25
#include "rm.h"
26

    
27
struct RMStream {
28
    AVPacket pkt;      ///< place to store merged video frame / reordered audio data
29
    int videobufsize;  ///< current assembled frame size
30
    int videobufpos;   ///< position for the next slice in the video buffer
31
    int curpic_num;    ///< picture number of current frame
32
    int cur_slice, slices;
33
    int64_t pktpos;    ///< first slice position in file
34
    /// Audio descrambling matrix parameters
35
    int64_t audiotimestamp; ///< Audio packet timestamp
36
    int sub_packet_cnt; // Subpacket counter, used while reading
37
    int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
38
    int audio_framesize; /// Audio frame size from container
39
    int sub_packet_lengths[16]; /// Length of each subpacket
40
};
41

    
42
typedef struct {
43
    int nb_packets;
44
    int old_format;
45
    int current_stream;
46
    int remaining_len;
47
    int audio_stream_num; ///< Stream number for audio packets
48
    int audio_pkt_cnt; ///< Output packet counter
49
} RMDemuxContext;
50

    
51
static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
52
{
53
    int i;
54
    char *q, r;
55

    
56
    q = buf;
57
    for(i=0;i<len;i++) {
58
        r = get_byte(pb);
59
        if (i < buf_size - 1)
60
            *q++ = r;
61
    }
62
    if (buf_size > 0) *q = '\0';
63
}
64

    
65
static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
66
{
67
    get_strl(pb, buf, buf_size, get_byte(pb));
68
}
69

    
70
static void rm_read_metadata(AVFormatContext *s, int wide)
71
{
72
    char buf[1024];
73
    int i;
74
    for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
75
        int len = wide ? get_be16(s->pb) : get_byte(s->pb);
76
        get_strl(s->pb, buf, sizeof(buf), len);
77
        av_metadata_set(&s->metadata, ff_rm_metadata[i], buf);
78
    }
79
}
80

    
81
RMStream *ff_rm_alloc_rmstream (void)
82
{
83
    RMStream *rms = av_mallocz(sizeof(RMStream));
84
    rms->curpic_num = -1;
85
    return rms;
86
}
87

    
88
void ff_rm_free_rmstream (RMStream *rms)
89
{
90
    av_free_packet(&rms->pkt);
91
}
92

    
93
static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
94
                                     AVStream *st, RMStream *ast, int read_all)
95
{
96
    char buf[256];
97
    uint32_t version;
98

    
99
    /* ra type header */
100
    version = get_be32(pb); /* version */
101
    if (((version >> 16) & 0xff) == 3) {
102
        int64_t startpos = url_ftell(pb);
103
        url_fskip(pb, 14);
104
        rm_read_metadata(s, 0);
105
        if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
106
            // fourcc (should always be "lpcJ")
107
            get_byte(pb);
108
            get_str8(pb, buf, sizeof(buf));
109
        }
110
        // Skip extra header crap (this should never happen)
111
        if ((startpos + (version & 0xffff)) > url_ftell(pb))
112
            url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
113
        st->codec->sample_rate = 8000;
114
        st->codec->channels = 1;
115
        st->codec->codec_type = CODEC_TYPE_AUDIO;
116
        st->codec->codec_id = CODEC_ID_RA_144;
117
    } else {
118
        int flavor, sub_packet_h, coded_framesize, sub_packet_size;
119
        /* old version (4) */
120
        get_be32(pb); /* .ra4 */
121
        get_be32(pb); /* data size */
122
        get_be16(pb); /* version2 */
123
        get_be32(pb); /* header size */
124
        flavor= get_be16(pb); /* add codec info / flavor */
125
        ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
126
        get_be32(pb); /* ??? */
127
        get_be32(pb); /* ??? */
128
        get_be32(pb); /* ??? */
129
        ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
130
        st->codec->block_align= get_be16(pb); /* frame size */
131
        ast->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
132
        get_be16(pb); /* ??? */
133
        if (((version >> 16) & 0xff) == 5) {
134
            get_be16(pb); get_be16(pb); get_be16(pb);
135
        }
136
        st->codec->sample_rate = get_be16(pb);
137
        get_be32(pb);
138
        st->codec->channels = get_be16(pb);
139
        if (((version >> 16) & 0xff) == 5) {
140
            get_be32(pb);
141
            get_buffer(pb, buf, 4);
142
            buf[4] = 0;
143
        } else {
144
            get_str8(pb, buf, sizeof(buf)); /* desc */
145
            get_str8(pb, buf, sizeof(buf)); /* desc */
146
        }
147
        st->codec->codec_type = CODEC_TYPE_AUDIO;
148
        if (!strcmp(buf, "dnet")) {
149
            st->codec->codec_id = CODEC_ID_AC3;
150
            st->need_parsing = AVSTREAM_PARSE_FULL;
151
        } else if (!strcmp(buf, "28_8")) {
152
            st->codec->codec_id = CODEC_ID_RA_288;
153
            st->codec->extradata_size= 0;
154
            ast->audio_framesize = st->codec->block_align;
155
            st->codec->block_align = coded_framesize;
156

    
157
            if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
158
                av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
159
                return -1;
160
            }
161

    
162
            av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
163
        } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc")) || (!strcmp(buf, "sipr"))) {
164
            int codecdata_length;
165
            get_be16(pb); get_byte(pb);
166
            if (((version >> 16) & 0xff) == 5)
167
                get_byte(pb);
168
            codecdata_length = get_be32(pb);
169
            if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
170
                av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
171
                return -1;
172
            }
173

    
174
            if(sub_packet_size <= 0){
175
                av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
176
                return -1;
177
            }
178

    
179
            if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
180
            else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;
181
            else st->codec->codec_id = CODEC_ID_ATRAC3;
182
            st->codec->extradata_size= codecdata_length;
183
            st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
184
            get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
185
            ast->audio_framesize = st->codec->block_align;
186
            st->codec->block_align = ast->sub_packet_size;
187

    
188
            if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
189
                av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
190
                return -1;
191
            }
192

    
193
            av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
194
        } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
195
            int codecdata_length;
196
            get_be16(pb); get_byte(pb);
197
            if (((version >> 16) & 0xff) == 5)
198
                get_byte(pb);
199
            st->codec->codec_id = CODEC_ID_AAC;
200
            codecdata_length = get_be32(pb);
201
            if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
202
                av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
203
                return -1;
204
            }
205
            if (codecdata_length >= 1) {
206
                st->codec->extradata_size = codecdata_length - 1;
207
                st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
208
                get_byte(pb);
209
                get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
210
            }
211
        } else {
212
            st->codec->codec_id = CODEC_ID_NONE;
213
            av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
214
        }
215
        if (read_all) {
216
            get_byte(pb);
217
            get_byte(pb);
218
            get_byte(pb);
219
            rm_read_metadata(s, 0);
220
        }
221
    }
222
    return 0;
223
}
224

    
225
int
226
ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
227
                           AVStream *st, RMStream *rst, int codec_data_size)
228
{
229
    unsigned int v;
230
    int size;
231
    int64_t codec_pos;
232

    
233
    av_set_pts_info(st, 64, 1, 1000);
234
    codec_pos = url_ftell(pb);
235
    v = get_be32(pb);
236
    if (v == MKTAG(0xfd, 'a', 'r', '.')) {
237
        /* ra type header */
238
        if (rm_read_audio_stream_info(s, pb, st, rst, 0))
239
            return -1;
240
    } else {
241
        int fps, fps2;
242
        if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
243
        fail1:
244
            av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
245
            goto skip;
246
        }
247
        st->codec->codec_tag = get_le32(pb);
248
//        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
249
        if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
250
            && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
251
            && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
252
            && st->codec->codec_tag != MKTAG('R', 'V', '4', '0')
253
            && st->codec->codec_tag != MKTAG('R', 'V', 'T', 'R'))
254
            goto fail1;
255
        st->codec->width = get_be16(pb);
256
        st->codec->height = get_be16(pb);
257
        st->codec->time_base.num= 1;
258
        fps= get_be16(pb);
259
        st->codec->codec_type = CODEC_TYPE_VIDEO;
260
        get_be32(pb);
261
        fps2= get_be16(pb);
262
        get_be16(pb);
263

    
264
        st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
265

    
266
        if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
267
            //check is redundant as get_buffer() will catch this
268
            av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
269
            return -1;
270
        }
271
        st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
272
        if (!st->codec->extradata)
273
            return AVERROR(ENOMEM);
274
        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
275

    
276
//        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
277
        st->codec->time_base.den = fps * st->codec->time_base.num;
278
        switch(((uint8_t*)st->codec->extradata)[4]>>4){
279
        case 1: st->codec->codec_id = CODEC_ID_RV10; break;
280
        case 2: st->codec->codec_id = CODEC_ID_RV20; break;
281
        case 3: st->codec->codec_id = CODEC_ID_RV30; break;
282
        case 4: st->codec->codec_id = CODEC_ID_RV40; break;
283
        default: goto fail1;
284
        }
285
    }
286

    
287
skip:
288
    /* skip codec info */
289
    size = url_ftell(pb) - codec_pos;
290
    url_fskip(pb, codec_data_size - size);
291

    
292
    return 0;
293
}
294

    
295
/** this function assumes that the demuxer has already seeked to the start
296
 * of the INDX chunk, and will bail out if not. */
297
static int rm_read_index(AVFormatContext *s)
298
{
299
    ByteIOContext *pb = s->pb;
300
    unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
301
    AVStream *st;
302

    
303
    do {
304
        if (get_le32(pb) != MKTAG('I','N','D','X'))
305
            return -1;
306
        size     = get_be32(pb);
307
        if (size < 20)
308
            return -1;
309
        url_fskip(pb, 2);
310
        n_pkts   = get_be32(pb);
311
        str_id   = get_be16(pb);
312
        next_off = get_be32(pb);
313
        for (n = 0; n < s->nb_streams; n++)
314
            if (s->streams[n]->id == str_id) {
315
                st = s->streams[n];
316
                break;
317
            }
318
        if (n == s->nb_streams)
319
            goto skip;
320

    
321
        for (n = 0; n < n_pkts; n++) {
322
            url_fskip(pb, 2);
323
            pts = get_be32(pb);
324
            pos = get_be32(pb);
325
            url_fskip(pb, 4); /* packet no. */
326

    
327
            av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
328
        }
329

    
330
skip:
331
        if (next_off && url_ftell(pb) != next_off &&
332
            url_fseek(pb, next_off, SEEK_SET) < 0)
333
            return -1;
334
    } while (next_off);
335

    
336
    return 0;
337
}
338

    
339
static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
340
{
341
    RMDemuxContext *rm = s->priv_data;
342
    AVStream *st;
343

    
344
    rm->old_format = 1;
345
    st = av_new_stream(s, 0);
346
    if (!st)
347
        return -1;
348
    st->priv_data = ff_rm_alloc_rmstream();
349
    return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
350
}
351

    
352
static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
353
{
354
    RMDemuxContext *rm = s->priv_data;
355
    AVStream *st;
356
    ByteIOContext *pb = s->pb;
357
    unsigned int tag;
358
    int tag_size;
359
    unsigned int start_time, duration;
360
    unsigned int data_off = 0, indx_off = 0;
361
    char buf[128];
362
    int flags = 0;
363

    
364
    tag = get_le32(pb);
365
    if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
366
        /* very old .ra format */
367
        return rm_read_header_old(s, ap);
368
    } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
369
        return AVERROR(EIO);
370
    }
371

    
372
    get_be32(pb); /* header size */
373
    get_be16(pb);
374
    get_be32(pb);
375
    get_be32(pb); /* number of headers */
376

    
377
    for(;;) {
378
        if (url_feof(pb))
379
            return -1;
380
        tag = get_le32(pb);
381
        tag_size = get_be32(pb);
382
        get_be16(pb);
383
#if 0
384
        printf("tag=%c%c%c%c (%08x) size=%d\n",
385
               (tag) & 0xff,
386
               (tag >> 8) & 0xff,
387
               (tag >> 16) & 0xff,
388
               (tag >> 24) & 0xff,
389
               tag,
390
               tag_size);
391
#endif
392
        if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
393
            return -1;
394
        switch(tag) {
395
        case MKTAG('P', 'R', 'O', 'P'):
396
            /* file header */
397
            get_be32(pb); /* max bit rate */
398
            get_be32(pb); /* avg bit rate */
399
            get_be32(pb); /* max packet size */
400
            get_be32(pb); /* avg packet size */
401
            get_be32(pb); /* nb packets */
402
            get_be32(pb); /* duration */
403
            get_be32(pb); /* preroll */
404
            indx_off = get_be32(pb); /* index offset */
405
            data_off = get_be32(pb); /* data offset */
406
            get_be16(pb); /* nb streams */
407
            flags = get_be16(pb); /* flags */
408
            break;
409
        case MKTAG('C', 'O', 'N', 'T'):
410
            rm_read_metadata(s, 1);
411
            break;
412
        case MKTAG('M', 'D', 'P', 'R'):
413
            st = av_new_stream(s, 0);
414
            if (!st)
415
                return AVERROR(ENOMEM);
416
            st->id = get_be16(pb);
417
            get_be32(pb); /* max bit rate */
418
            st->codec->bit_rate = get_be32(pb); /* bit rate */
419
            get_be32(pb); /* max packet size */
420
            get_be32(pb); /* avg packet size */
421
            start_time = get_be32(pb); /* start time */
422
            get_be32(pb); /* preroll */
423
            duration = get_be32(pb); /* duration */
424
            st->start_time = start_time;
425
            st->duration = duration;
426
            get_str8(pb, buf, sizeof(buf)); /* desc */
427
            get_str8(pb, buf, sizeof(buf)); /* mimetype */
428
            st->codec->codec_type = CODEC_TYPE_DATA;
429
            st->priv_data = ff_rm_alloc_rmstream();
430
            if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
431
                                          get_be32(pb)) < 0)
432
                return -1;
433
            break;
434
        case MKTAG('D', 'A', 'T', 'A'):
435
            goto header_end;
436
        default:
437
            /* unknown tag: skip it */
438
            url_fskip(pb, tag_size - 10);
439
            break;
440
        }
441
    }
442
 header_end:
443
    rm->nb_packets = get_be32(pb); /* number of packets */
444
    if (!rm->nb_packets && (flags & 4))
445
        rm->nb_packets = 3600 * 25;
446
    get_be32(pb); /* next data header */
447

    
448
    if (!data_off)
449
        data_off = url_ftell(pb) - 18;
450
    if (indx_off && url_fseek(pb, indx_off, SEEK_SET) >= 0) {
451
        rm_read_index(s);
452
        url_fseek(pb, data_off + 18, SEEK_SET);
453
    }
454

    
455
    return 0;
456
}
457

    
458
static int get_num(ByteIOContext *pb, int *len)
459
{
460
    int n, n1;
461

    
462
    n = get_be16(pb);
463
    (*len)-=2;
464
    n &= 0x7FFF;
465
    if (n >= 0x4000) {
466
        return n - 0x4000;
467
    } else {
468
        n1 = get_be16(pb);
469
        (*len)-=2;
470
        return (n << 16) | n1;
471
    }
472
}
473

    
474
/* multiple of 20 bytes for ra144 (ugly) */
475
#define RAW_PACKET_SIZE 1000
476

    
477
static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
478
    RMDemuxContext *rm = s->priv_data;
479
    ByteIOContext *pb = s->pb;
480
    int len, num, res, i;
481
    AVStream *st;
482
    uint32_t state=0xFFFFFFFF;
483

    
484
    while(!url_feof(pb)){
485
        *pos= url_ftell(pb) - 3;
486
        if(rm->remaining_len > 0){
487
            num= rm->current_stream;
488
            len= rm->remaining_len;
489
            *timestamp = AV_NOPTS_VALUE;
490
            *flags= 0;
491
        }else{
492
            state= (state<<8) + get_byte(pb);
493

    
494
            if(state == MKBETAG('I', 'N', 'D', 'X')){
495
                int n_pkts, expected_len;
496
                len = get_be32(pb);
497
                url_fskip(pb, 2);
498
                n_pkts = get_be32(pb);
499
                expected_len = 20 + n_pkts * 14;
500
                if (len == 20)
501
                    /* some files don't add index entries to chunk size... */
502
                    len = expected_len;
503
                else if (len != expected_len)
504
                    av_log(s, AV_LOG_WARNING,
505
                           "Index size %d (%d pkts) is wrong, should be %d.\n",
506
                           len, n_pkts, expected_len);
507
                len -= 14; // we already read part of the index header
508
                if(len<0)
509
                    continue;
510
                goto skip;
511
            }
512

    
513
            if(state > (unsigned)0xFFFF || state < 12)
514
                continue;
515
            len=state;
516
            state= 0xFFFFFFFF;
517

    
518
            num = get_be16(pb);
519
            *timestamp = get_be32(pb);
520
            res= get_byte(pb); /* reserved */
521
            *flags = get_byte(pb); /* flags */
522

    
523

    
524
            len -= 12;
525
        }
526
        for(i=0;i<s->nb_streams;i++) {
527
            st = s->streams[i];
528
            if (num == st->id)
529
                break;
530
        }
531
        if (i == s->nb_streams) {
532
skip:
533
            /* skip packet if unknown number */
534
            url_fskip(pb, len);
535
            rm->remaining_len = 0;
536
            continue;
537
        }
538
        *stream_index= i;
539

    
540
        return len;
541
    }
542
    return -1;
543
}
544

    
545
static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
546
                                   RMDemuxContext *rm, RMStream *vst,
547
                                   AVPacket *pkt, int len, int *pseq)
548
{
549
    int hdr, seq, pic_num, len2, pos;
550
    int type;
551

    
552
    hdr = get_byte(pb); len--;
553
    type = hdr >> 6;
554

    
555
    if(type != 3){  // not frame as a part of packet
556
        seq = get_byte(pb); len--;
557
    }
558
    if(type != 1){  // not whole frame
559
        len2 = get_num(pb, &len);
560
        pos  = get_num(pb, &len);
561
        pic_num = get_byte(pb); len--;
562
    }
563
    if(len<0)
564
        return -1;
565
    rm->remaining_len = len;
566
    if(type&1){     // frame, not slice
567
        if(type == 3)  // frame as a part of packet
568
            len= len2;
569
        if(rm->remaining_len < len)
570
            return -1;
571
        rm->remaining_len -= len;
572
        if(av_new_packet(pkt, len + 9) < 0)
573
            return AVERROR(EIO);
574
        pkt->data[0] = 0;
575
        AV_WL32(pkt->data + 1, 1);
576
        AV_WL32(pkt->data + 5, 0);
577
        get_buffer(pb, pkt->data + 9, len);
578
        return 0;
579
    }
580
    //now we have to deal with single slice
581

    
582
    *pseq = seq;
583
    if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
584
        vst->slices = ((hdr & 0x3F) << 1) + 1;
585
        vst->videobufsize = len2 + 8*vst->slices + 1;
586
        av_free_packet(&vst->pkt); //FIXME this should be output.
587
        if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
588
            return AVERROR(ENOMEM);
589
        vst->videobufpos = 8*vst->slices + 1;
590
        vst->cur_slice = 0;
591
        vst->curpic_num = pic_num;
592
        vst->pktpos = url_ftell(pb);
593
    }
594
    if(type == 2)
595
        len = FFMIN(len, pos);
596

    
597
    if(++vst->cur_slice > vst->slices)
598
        return 1;
599
    AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
600
    AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
601
    if(vst->videobufpos + len > vst->videobufsize)
602
        return 1;
603
    if (get_buffer(pb, vst->pkt.data + vst->videobufpos, len) != len)
604
        return AVERROR(EIO);
605
    vst->videobufpos += len;
606
    rm->remaining_len-= len;
607

    
608
    if(type == 2 || (vst->videobufpos) == vst->videobufsize){
609
        vst->pkt.data[0] = vst->cur_slice-1;
610
        *pkt= vst->pkt;
611
        vst->pkt.data= NULL;
612
        vst->pkt.size= 0;
613
        if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
614
            memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
615
                vst->videobufpos - 1 - 8*vst->slices);
616
        pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
617
        pkt->pts = AV_NOPTS_VALUE;
618
        pkt->pos = vst->pktpos;
619
        return 0;
620
    }
621

    
622
    return 1;
623
}
624

    
625
static inline void
626
rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
627
{
628
    uint8_t *ptr;
629
    int j;
630

    
631
    if (st->codec->codec_id == CODEC_ID_AC3) {
632
        ptr = pkt->data;
633
        for (j=0;j<pkt->size;j+=2) {
634
            FFSWAP(int, ptr[0], ptr[1]);
635
            ptr += 2;
636
        }
637
    }
638
}
639

    
640
int
641
ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
642
                    AVStream *st, RMStream *ast, int len, AVPacket *pkt,
643
                    int *seq, int *flags, int64_t *timestamp)
644
{
645
    RMDemuxContext *rm = s->priv_data;
646

    
647
    if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
648
        rm->current_stream= st->id;
649
        if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))
650
            return -1; //got partial frame
651
    } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
652
        if ((st->codec->codec_id == CODEC_ID_RA_288) ||
653
            (st->codec->codec_id == CODEC_ID_COOK) ||
654
            (st->codec->codec_id == CODEC_ID_ATRAC3) ||
655
            (st->codec->codec_id == CODEC_ID_SIPR)) {
656
            int x;
657
            int sps = ast->sub_packet_size;
658
            int cfs = ast->coded_framesize;
659
            int h = ast->sub_packet_h;
660
            int y = ast->sub_packet_cnt;
661
            int w = ast->audio_framesize;
662

    
663
            if (*flags & 2)
664
                y = ast->sub_packet_cnt = 0;
665
            if (!y)
666
                ast->audiotimestamp = *timestamp;
667

    
668
            switch(st->codec->codec_id) {
669
                case CODEC_ID_RA_288:
670
                    for (x = 0; x < h/2; x++)
671
                        get_buffer(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
672
                    break;
673
                case CODEC_ID_ATRAC3:
674
                case CODEC_ID_COOK:
675
                    for (x = 0; x < w/sps; x++)
676
                        get_buffer(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
677
                    break;
678
            }
679

    
680
            if (++(ast->sub_packet_cnt) < h)
681
                return -1;
682
             ast->sub_packet_cnt = 0;
683
             rm->audio_stream_num = st->index;
684
             rm->audio_pkt_cnt = h * w / st->codec->block_align;
685
        } else if (st->codec->codec_id == CODEC_ID_AAC) {
686
            int x;
687
            rm->audio_stream_num = st->index;
688
            ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
689
            if (ast->sub_packet_cnt) {
690
                for (x = 0; x < ast->sub_packet_cnt; x++)
691
                    ast->sub_packet_lengths[x] = get_be16(pb);
692
                rm->audio_pkt_cnt = ast->sub_packet_cnt;
693
                ast->audiotimestamp = *timestamp;
694
            } else
695
                return -1;
696
        } else {
697
            av_get_packet(pb, pkt, len);
698
            rm_ac3_swap_bytes(st, pkt);
699
        }
700
    } else
701
        av_get_packet(pb, pkt, len);
702

    
703
    pkt->stream_index = st->index;
704

    
705
#if 0
706
    if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
707
        if(st->codec->codec_id == CODEC_ID_RV20){
708
            int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
709
            av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
710

711
            seq |= (*timestamp&~0x3FFF);
712
            if(seq - *timestamp >  0x2000) seq -= 0x4000;
713
            if(seq - *timestamp < -0x2000) seq += 0x4000;
714
        }
715
    }
716
#endif
717

    
718
    pkt->pts= *timestamp;
719
    if (*flags & 2)
720
        pkt->flags |= PKT_FLAG_KEY;
721

    
722
    return st->codec->codec_type == CODEC_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
723
}
724

    
725
int
726
ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
727
                      AVStream *st, RMStream *ast, AVPacket *pkt)
728
{
729
    RMDemuxContext *rm = s->priv_data;
730

    
731
    assert (rm->audio_pkt_cnt > 0);
732

    
733
    if (st->codec->codec_id == CODEC_ID_AAC)
734
        av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
735
    else {
736
        av_new_packet(pkt, st->codec->block_align);
737
        memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
738
               (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
739
               st->codec->block_align);
740
    }
741
    rm->audio_pkt_cnt--;
742
    if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
743
        ast->audiotimestamp = AV_NOPTS_VALUE;
744
        pkt->flags = PKT_FLAG_KEY;
745
    } else
746
        pkt->flags = 0;
747
    pkt->stream_index = st->index;
748

    
749
    return rm->audio_pkt_cnt;
750
}
751

    
752
static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
753
{
754
    RMDemuxContext *rm = s->priv_data;
755
    AVStream *st;
756
    int i, len, res, seq = 1;
757
    int64_t timestamp, pos;
758
    int old_flags, flags;
759

    
760
    for (;;) {
761
        if (rm->audio_pkt_cnt) {
762
            // If there are queued audio packet return them first
763
            st = s->streams[rm->audio_stream_num];
764
            ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
765
        } else {
766
            if (rm->old_format) {
767
                RMStream *ast;
768

    
769
                st = s->streams[0];
770
                ast = st->priv_data;
771
                timestamp = AV_NOPTS_VALUE;
772
                len = !ast->audio_framesize ? RAW_PACKET_SIZE :
773
                    ast->coded_framesize * ast->sub_packet_h / 2;
774
                flags = (seq++ == 1) ? 2 : 0;
775
            } else {
776
                len=sync(s, &timestamp, &flags, &i, &pos);
777
                st = s->streams[i];
778
            }
779

    
780
            if(len<0 || url_feof(s->pb))
781
                return AVERROR(EIO);
782

    
783
            old_flags = flags;
784
            res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
785
                                      &seq, &flags, &timestamp);
786
            if((old_flags&2) && (seq&0x7F) == 1)
787
                av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
788
            if (res)
789
                continue;
790
        }
791

    
792
        if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
793
           || st->discard >= AVDISCARD_ALL){
794
            av_free_packet(pkt);
795
        } else
796
            break;
797
    }
798

    
799
    return 0;
800
}
801

    
802
static int rm_read_close(AVFormatContext *s)
803
{
804
    int i;
805

    
806
    for (i=0;i<s->nb_streams;i++)
807
        ff_rm_free_rmstream(s->streams[i]->priv_data);
808

    
809
    return 0;
810
}
811

    
812
static int rm_probe(AVProbeData *p)
813
{
814
    /* check file header */
815
    if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
816
         p->buf[2] == 'M' && p->buf[3] == 'F' &&
817
         p->buf[4] == 0 && p->buf[5] == 0) ||
818
        (p->buf[0] == '.' && p->buf[1] == 'r' &&
819
         p->buf[2] == 'a' && p->buf[3] == 0xfd))
820
        return AVPROBE_SCORE_MAX;
821
    else
822
        return 0;
823
}
824

    
825
static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
826
                               int64_t *ppos, int64_t pos_limit)
827
{
828
    RMDemuxContext *rm = s->priv_data;
829
    int64_t pos, dts;
830
    int stream_index2, flags, len, h;
831

    
832
    pos = *ppos;
833

    
834
    if(rm->old_format)
835
        return AV_NOPTS_VALUE;
836

    
837
    url_fseek(s->pb, pos, SEEK_SET);
838
    rm->remaining_len=0;
839
    for(;;){
840
        int seq=1;
841
        AVStream *st;
842

    
843
        len=sync(s, &dts, &flags, &stream_index2, &pos);
844
        if(len<0)
845
            return AV_NOPTS_VALUE;
846

    
847
        st = s->streams[stream_index2];
848
        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
849
            h= get_byte(s->pb); len--;
850
            if(!(h & 0x40)){
851
                seq = get_byte(s->pb); len--;
852
            }
853
        }
854

    
855
        if((flags&2) && (seq&0x7F) == 1){
856
//            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
857
            av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
858
            if(stream_index2 == stream_index)
859
                break;
860
        }
861

    
862
        url_fskip(s->pb, len);
863
    }
864
    *ppos = pos;
865
    return dts;
866
}
867

    
868
AVInputFormat rm_demuxer = {
869
    "rm",
870
    NULL_IF_CONFIG_SMALL("RealMedia format"),
871
    sizeof(RMDemuxContext),
872
    rm_probe,
873
    rm_read_header,
874
    rm_read_packet,
875
    rm_read_close,
876
    NULL,
877
    rm_read_dts,
878
};
879

    
880
AVInputFormat rdt_demuxer = {
881
    "rdt",
882
    NULL_IF_CONFIG_SMALL("RDT demuxer"),
883
    sizeof(RMDemuxContext),
884
    NULL,
885
    NULL,
886
    NULL,
887
    rm_read_close,
888
};