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ffmpeg / libavformat / rmdec.c @ e6b09f43

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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 const unsigned char sipr_swaps[38][2] = {
52
    {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },
53
    {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },
54
    { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
55
    { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
56
    { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
57
    { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
58
    { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
59
    { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
60
    { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
61
    { 67, 83 }, { 77, 80 }
62
};
63

    
64
static const unsigned char sipr_subpk_size[4] = { 29, 19, 37, 20 };
65

    
66
static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
67
{
68
    int i;
69
    char *q, r;
70

    
71
    q = buf;
72
    for(i=0;i<len;i++) {
73
        r = get_byte(pb);
74
        if (i < buf_size - 1)
75
            *q++ = r;
76
    }
77
    if (buf_size > 0) *q = '\0';
78
}
79

    
80
static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
81
{
82
    get_strl(pb, buf, buf_size, get_byte(pb));
83
}
84

    
85
static void rm_read_metadata(AVFormatContext *s, int wide)
86
{
87
    char buf[1024];
88
    int i;
89
    for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
90
        int len = wide ? get_be16(s->pb) : get_byte(s->pb);
91
        get_strl(s->pb, buf, sizeof(buf), len);
92
        av_metadata_set(&s->metadata, ff_rm_metadata[i], buf);
93
    }
94
}
95

    
96
RMStream *ff_rm_alloc_rmstream (void)
97
{
98
    RMStream *rms = av_mallocz(sizeof(RMStream));
99
    rms->curpic_num = -1;
100
    return rms;
101
}
102

    
103
void ff_rm_free_rmstream (RMStream *rms)
104
{
105
    av_free_packet(&rms->pkt);
106
}
107

    
108
static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
109
                                     AVStream *st, RMStream *ast, int read_all)
110
{
111
    char buf[256];
112
    uint32_t version;
113

    
114
    /* ra type header */
115
    version = get_be32(pb); /* version */
116
    if (((version >> 16) & 0xff) == 3) {
117
        int64_t startpos = url_ftell(pb);
118
        url_fskip(pb, 14);
119
        rm_read_metadata(s, 0);
120
        if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {
121
            // fourcc (should always be "lpcJ")
122
            get_byte(pb);
123
            get_str8(pb, buf, sizeof(buf));
124
        }
125
        // Skip extra header crap (this should never happen)
126
        if ((startpos + (version & 0xffff)) > url_ftell(pb))
127
            url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));
128
        st->codec->sample_rate = 8000;
129
        st->codec->channels = 1;
130
        st->codec->codec_type = CODEC_TYPE_AUDIO;
131
        st->codec->codec_id = CODEC_ID_RA_144;
132
    } else {
133
        int flavor, sub_packet_h, coded_framesize, sub_packet_size;
134
        /* old version (4) */
135
        get_be32(pb); /* .ra4 */
136
        get_be32(pb); /* data size */
137
        get_be16(pb); /* version2 */
138
        get_be32(pb); /* header size */
139
        flavor= get_be16(pb); /* add codec info / flavor */
140
        ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
141
        get_be32(pb); /* ??? */
142
        get_be32(pb); /* ??? */
143
        get_be32(pb); /* ??? */
144
        ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
145
        st->codec->block_align= get_be16(pb); /* frame size */
146
        ast->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */
147
        get_be16(pb); /* ??? */
148
        if (((version >> 16) & 0xff) == 5) {
149
            get_be16(pb); get_be16(pb); get_be16(pb);
150
        }
151
        st->codec->sample_rate = get_be16(pb);
152
        get_be32(pb);
153
        st->codec->channels = get_be16(pb);
154
        if (((version >> 16) & 0xff) == 5) {
155
            get_be32(pb);
156
            get_buffer(pb, buf, 4);
157
            buf[4] = 0;
158
        } else {
159
            get_str8(pb, buf, sizeof(buf)); /* desc */
160
            get_str8(pb, buf, sizeof(buf)); /* desc */
161
        }
162
        st->codec->codec_type = CODEC_TYPE_AUDIO;
163
        if (!strcmp(buf, "dnet")) {
164
            st->codec->codec_id = CODEC_ID_AC3;
165
            st->need_parsing = AVSTREAM_PARSE_FULL;
166
        } else if (!strcmp(buf, "28_8")) {
167
            st->codec->codec_id = CODEC_ID_RA_288;
168
            st->codec->extradata_size= 0;
169
            ast->audio_framesize = st->codec->block_align;
170
            st->codec->block_align = coded_framesize;
171

    
172
            if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
173
                av_log(s, AV_LOG_ERROR, "ast->audio_framesize * sub_packet_h too large\n");
174
                return -1;
175
            }
176

    
177
            av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
178
        } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc")) || (!strcmp(buf, "sipr"))) {
179
            int codecdata_length;
180
            get_be16(pb); get_byte(pb);
181
            if (((version >> 16) & 0xff) == 5)
182
                get_byte(pb);
183
            codecdata_length = get_be32(pb);
184
            if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
185
                av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
186
                return -1;
187
            }
188

    
189
            if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
190
            else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;
191
            else st->codec->codec_id = CODEC_ID_ATRAC3;
192

    
193
            ast->audio_framesize = st->codec->block_align;
194
            if (st->codec->codec_id == CODEC_ID_SIPR) {
195
                if (flavor > 3) {
196
                    av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
197
                           flavor);
198
                    return -1;
199
                }
200
                st->codec->block_align = sipr_subpk_size[flavor];
201
            } else {
202
                if(sub_packet_size <= 0){
203
                    av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
204
                    return -1;
205
                }
206
                st->codec->block_align = ast->sub_packet_size;
207
            }
208
            st->codec->extradata_size= codecdata_length;
209
            st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
210
            get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
211

    
212
            if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
213
                av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
214
                return -1;
215
            }
216

    
217
            av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
218
        } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
219
            int codecdata_length;
220
            get_be16(pb); get_byte(pb);
221
            if (((version >> 16) & 0xff) == 5)
222
                get_byte(pb);
223
            st->codec->codec_id = CODEC_ID_AAC;
224
            codecdata_length = get_be32(pb);
225
            if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
226
                av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
227
                return -1;
228
            }
229
            if (codecdata_length >= 1) {
230
                st->codec->extradata_size = codecdata_length - 1;
231
                st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
232
                get_byte(pb);
233
                get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
234
            }
235
        } else {
236
            st->codec->codec_id = CODEC_ID_NONE;
237
            av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
238
        }
239
        if (read_all) {
240
            get_byte(pb);
241
            get_byte(pb);
242
            get_byte(pb);
243
            rm_read_metadata(s, 0);
244
        }
245
    }
246
    return 0;
247
}
248

    
249
int
250
ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
251
                           AVStream *st, RMStream *rst, int codec_data_size)
252
{
253
    unsigned int v;
254
    int size;
255
    int64_t codec_pos;
256

    
257
    av_set_pts_info(st, 64, 1, 1000);
258
    codec_pos = url_ftell(pb);
259
    v = get_be32(pb);
260
    if (v == MKTAG(0xfd, 'a', 'r', '.')) {
261
        /* ra type header */
262
        if (rm_read_audio_stream_info(s, pb, st, rst, 0))
263
            return -1;
264
    } else {
265
        int fps, fps2;
266
        if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
267
        fail1:
268
            av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");
269
            goto skip;
270
        }
271
        st->codec->codec_tag = get_le32(pb);
272
//        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
273
        if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')
274
            && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')
275
            && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')
276
            && st->codec->codec_tag != MKTAG('R', 'V', '4', '0')
277
            && st->codec->codec_tag != MKTAG('R', 'V', 'T', 'R'))
278
            goto fail1;
279
        st->codec->width = get_be16(pb);
280
        st->codec->height = get_be16(pb);
281
        st->codec->time_base.num= 1;
282
        fps= get_be16(pb);
283
        st->codec->codec_type = CODEC_TYPE_VIDEO;
284
        get_be32(pb);
285
        fps2= get_be16(pb);
286
        get_be16(pb);
287

    
288
        st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
289

    
290
        if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
291
            //check is redundant as get_buffer() will catch this
292
            av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
293
            return -1;
294
        }
295
        st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
296
        if (!st->codec->extradata)
297
            return AVERROR(ENOMEM);
298
        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
299

    
300
//        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
301
        st->codec->time_base.den = fps * st->codec->time_base.num;
302
        switch(((uint8_t*)st->codec->extradata)[4]>>4){
303
        case 1: st->codec->codec_id = CODEC_ID_RV10; break;
304
        case 2: st->codec->codec_id = CODEC_ID_RV20; break;
305
        case 3: st->codec->codec_id = CODEC_ID_RV30; break;
306
        case 4: st->codec->codec_id = CODEC_ID_RV40; break;
307
        default: goto fail1;
308
        }
309
    }
310

    
311
skip:
312
    /* skip codec info */
313
    size = url_ftell(pb) - codec_pos;
314
    url_fskip(pb, codec_data_size - size);
315

    
316
    return 0;
317
}
318

    
319
/** this function assumes that the demuxer has already seeked to the start
320
 * of the INDX chunk, and will bail out if not. */
321
static int rm_read_index(AVFormatContext *s)
322
{
323
    ByteIOContext *pb = s->pb;
324
    unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
325
    AVStream *st;
326

    
327
    do {
328
        if (get_le32(pb) != MKTAG('I','N','D','X'))
329
            return -1;
330
        size     = get_be32(pb);
331
        if (size < 20)
332
            return -1;
333
        url_fskip(pb, 2);
334
        n_pkts   = get_be32(pb);
335
        str_id   = get_be16(pb);
336
        next_off = get_be32(pb);
337
        for (n = 0; n < s->nb_streams; n++)
338
            if (s->streams[n]->id == str_id) {
339
                st = s->streams[n];
340
                break;
341
            }
342
        if (n == s->nb_streams)
343
            goto skip;
344

    
345
        for (n = 0; n < n_pkts; n++) {
346
            url_fskip(pb, 2);
347
            pts = get_be32(pb);
348
            pos = get_be32(pb);
349
            url_fskip(pb, 4); /* packet no. */
350

    
351
            av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
352
        }
353

    
354
skip:
355
        if (next_off && url_ftell(pb) != next_off &&
356
            url_fseek(pb, next_off, SEEK_SET) < 0)
357
            return -1;
358
    } while (next_off);
359

    
360
    return 0;
361
}
362

    
363
static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
364
{
365
    RMDemuxContext *rm = s->priv_data;
366
    AVStream *st;
367

    
368
    rm->old_format = 1;
369
    st = av_new_stream(s, 0);
370
    if (!st)
371
        return -1;
372
    st->priv_data = ff_rm_alloc_rmstream();
373
    return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
374
}
375

    
376
static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
377
{
378
    RMDemuxContext *rm = s->priv_data;
379
    AVStream *st;
380
    ByteIOContext *pb = s->pb;
381
    unsigned int tag;
382
    int tag_size;
383
    unsigned int start_time, duration;
384
    unsigned int data_off = 0, indx_off = 0;
385
    char buf[128];
386
    int flags = 0;
387

    
388
    tag = get_le32(pb);
389
    if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
390
        /* very old .ra format */
391
        return rm_read_header_old(s, ap);
392
    } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
393
        return AVERROR(EIO);
394
    }
395

    
396
    get_be32(pb); /* header size */
397
    get_be16(pb);
398
    get_be32(pb);
399
    get_be32(pb); /* number of headers */
400

    
401
    for(;;) {
402
        if (url_feof(pb))
403
            return -1;
404
        tag = get_le32(pb);
405
        tag_size = get_be32(pb);
406
        get_be16(pb);
407
#if 0
408
        printf("tag=%c%c%c%c (%08x) size=%d\n",
409
               (tag) & 0xff,
410
               (tag >> 8) & 0xff,
411
               (tag >> 16) & 0xff,
412
               (tag >> 24) & 0xff,
413
               tag,
414
               tag_size);
415
#endif
416
        if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
417
            return -1;
418
        switch(tag) {
419
        case MKTAG('P', 'R', 'O', 'P'):
420
            /* file header */
421
            get_be32(pb); /* max bit rate */
422
            get_be32(pb); /* avg bit rate */
423
            get_be32(pb); /* max packet size */
424
            get_be32(pb); /* avg packet size */
425
            get_be32(pb); /* nb packets */
426
            get_be32(pb); /* duration */
427
            get_be32(pb); /* preroll */
428
            indx_off = get_be32(pb); /* index offset */
429
            data_off = get_be32(pb); /* data offset */
430
            get_be16(pb); /* nb streams */
431
            flags = get_be16(pb); /* flags */
432
            break;
433
        case MKTAG('C', 'O', 'N', 'T'):
434
            rm_read_metadata(s, 1);
435
            break;
436
        case MKTAG('M', 'D', 'P', 'R'):
437
            st = av_new_stream(s, 0);
438
            if (!st)
439
                return AVERROR(ENOMEM);
440
            st->id = get_be16(pb);
441
            get_be32(pb); /* max bit rate */
442
            st->codec->bit_rate = get_be32(pb); /* bit rate */
443
            get_be32(pb); /* max packet size */
444
            get_be32(pb); /* avg packet size */
445
            start_time = get_be32(pb); /* start time */
446
            get_be32(pb); /* preroll */
447
            duration = get_be32(pb); /* duration */
448
            st->start_time = start_time;
449
            st->duration = duration;
450
            get_str8(pb, buf, sizeof(buf)); /* desc */
451
            get_str8(pb, buf, sizeof(buf)); /* mimetype */
452
            st->codec->codec_type = CODEC_TYPE_DATA;
453
            st->priv_data = ff_rm_alloc_rmstream();
454
            if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
455
                                          get_be32(pb)) < 0)
456
                return -1;
457
            break;
458
        case MKTAG('D', 'A', 'T', 'A'):
459
            goto header_end;
460
        default:
461
            /* unknown tag: skip it */
462
            url_fskip(pb, tag_size - 10);
463
            break;
464
        }
465
    }
466
 header_end:
467
    rm->nb_packets = get_be32(pb); /* number of packets */
468
    if (!rm->nb_packets && (flags & 4))
469
        rm->nb_packets = 3600 * 25;
470
    get_be32(pb); /* next data header */
471

    
472
    if (!data_off)
473
        data_off = url_ftell(pb) - 18;
474
    if (indx_off && url_fseek(pb, indx_off, SEEK_SET) >= 0) {
475
        rm_read_index(s);
476
        url_fseek(pb, data_off + 18, SEEK_SET);
477
    }
478

    
479
    return 0;
480
}
481

    
482
static int get_num(ByteIOContext *pb, int *len)
483
{
484
    int n, n1;
485

    
486
    n = get_be16(pb);
487
    (*len)-=2;
488
    n &= 0x7FFF;
489
    if (n >= 0x4000) {
490
        return n - 0x4000;
491
    } else {
492
        n1 = get_be16(pb);
493
        (*len)-=2;
494
        return (n << 16) | n1;
495
    }
496
}
497

    
498
/* multiple of 20 bytes for ra144 (ugly) */
499
#define RAW_PACKET_SIZE 1000
500

    
501
static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
502
    RMDemuxContext *rm = s->priv_data;
503
    ByteIOContext *pb = s->pb;
504
    int len, num, res, i;
505
    AVStream *st;
506
    uint32_t state=0xFFFFFFFF;
507

    
508
    while(!url_feof(pb)){
509
        *pos= url_ftell(pb) - 3;
510
        if(rm->remaining_len > 0){
511
            num= rm->current_stream;
512
            len= rm->remaining_len;
513
            *timestamp = AV_NOPTS_VALUE;
514
            *flags= 0;
515
        }else{
516
            state= (state<<8) + get_byte(pb);
517

    
518
            if(state == MKBETAG('I', 'N', 'D', 'X')){
519
                int n_pkts, expected_len;
520
                len = get_be32(pb);
521
                url_fskip(pb, 2);
522
                n_pkts = get_be32(pb);
523
                expected_len = 20 + n_pkts * 14;
524
                if (len == 20)
525
                    /* some files don't add index entries to chunk size... */
526
                    len = expected_len;
527
                else if (len != expected_len)
528
                    av_log(s, AV_LOG_WARNING,
529
                           "Index size %d (%d pkts) is wrong, should be %d.\n",
530
                           len, n_pkts, expected_len);
531
                len -= 14; // we already read part of the index header
532
                if(len<0)
533
                    continue;
534
                goto skip;
535
            }
536

    
537
            if(state > (unsigned)0xFFFF || state <= 12)
538
                continue;
539
            len=state - 12;
540
            state= 0xFFFFFFFF;
541

    
542
            num = get_be16(pb);
543
            *timestamp = get_be32(pb);
544
            res= get_byte(pb); /* reserved */
545
            *flags = get_byte(pb); /* flags */
546
        }
547
        for(i=0;i<s->nb_streams;i++) {
548
            st = s->streams[i];
549
            if (num == st->id)
550
                break;
551
        }
552
        if (i == s->nb_streams) {
553
skip:
554
            /* skip packet if unknown number */
555
            url_fskip(pb, len);
556
            rm->remaining_len = 0;
557
            continue;
558
        }
559
        *stream_index= i;
560

    
561
        return len;
562
    }
563
    return -1;
564
}
565

    
566
static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
567
                                   RMDemuxContext *rm, RMStream *vst,
568
                                   AVPacket *pkt, int len, int *pseq)
569
{
570
    int hdr, seq, pic_num, len2, pos;
571
    int type;
572

    
573
    hdr = get_byte(pb); len--;
574
    type = hdr >> 6;
575

    
576
    if(type != 3){  // not frame as a part of packet
577
        seq = get_byte(pb); len--;
578
    }
579
    if(type != 1){  // not whole frame
580
        len2 = get_num(pb, &len);
581
        pos  = get_num(pb, &len);
582
        pic_num = get_byte(pb); len--;
583
    }
584
    if(len<0)
585
        return -1;
586
    rm->remaining_len = len;
587
    if(type&1){     // frame, not slice
588
        if(type == 3)  // frame as a part of packet
589
            len= len2;
590
        if(rm->remaining_len < len)
591
            return -1;
592
        rm->remaining_len -= len;
593
        if(av_new_packet(pkt, len + 9) < 0)
594
            return AVERROR(EIO);
595
        pkt->data[0] = 0;
596
        AV_WL32(pkt->data + 1, 1);
597
        AV_WL32(pkt->data + 5, 0);
598
        get_buffer(pb, pkt->data + 9, len);
599
        return 0;
600
    }
601
    //now we have to deal with single slice
602

    
603
    *pseq = seq;
604
    if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
605
        vst->slices = ((hdr & 0x3F) << 1) + 1;
606
        vst->videobufsize = len2 + 8*vst->slices + 1;
607
        av_free_packet(&vst->pkt); //FIXME this should be output.
608
        if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
609
            return AVERROR(ENOMEM);
610
        vst->videobufpos = 8*vst->slices + 1;
611
        vst->cur_slice = 0;
612
        vst->curpic_num = pic_num;
613
        vst->pktpos = url_ftell(pb);
614
    }
615
    if(type == 2)
616
        len = FFMIN(len, pos);
617

    
618
    if(++vst->cur_slice > vst->slices)
619
        return 1;
620
    AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
621
    AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
622
    if(vst->videobufpos + len > vst->videobufsize)
623
        return 1;
624
    if (get_buffer(pb, vst->pkt.data + vst->videobufpos, len) != len)
625
        return AVERROR(EIO);
626
    vst->videobufpos += len;
627
    rm->remaining_len-= len;
628

    
629
    if(type == 2 || (vst->videobufpos) == vst->videobufsize){
630
        vst->pkt.data[0] = vst->cur_slice-1;
631
        *pkt= vst->pkt;
632
        vst->pkt.data= NULL;
633
        vst->pkt.size= 0;
634
        if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
635
            memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
636
                vst->videobufpos - 1 - 8*vst->slices);
637
        pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
638
        pkt->pts = AV_NOPTS_VALUE;
639
        pkt->pos = vst->pktpos;
640
        return 0;
641
    }
642

    
643
    return 1;
644
}
645

    
646
static inline void
647
rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
648
{
649
    uint8_t *ptr;
650
    int j;
651

    
652
    if (st->codec->codec_id == CODEC_ID_AC3) {
653
        ptr = pkt->data;
654
        for (j=0;j<pkt->size;j+=2) {
655
            FFSWAP(int, ptr[0], ptr[1]);
656
            ptr += 2;
657
        }
658
    }
659
}
660

    
661
/**
662
 * Perform 4-bit block reordering for SIPR data.
663
 * @todo This can be optimized, e.g. use memcpy() if data blocks are aligned
664
 */
665
static void
666
rm_reorder_sipr_data (RMStream *ast)
667
{
668
    int n, bs = ast->sub_packet_h * ast->audio_framesize * 2 / 96; // nibbles per subpacket
669

    
670
    for (n = 0; n < 38; n++) {
671
        int j;
672
        int i = bs * sipr_swaps[n][0];
673
        int o = bs * sipr_swaps[n][1];
674
        uint8_t *buf = ast->pkt.data;
675

    
676
        /* swap 4bit-nibbles of block 'i' with 'o' */
677
        for (j = 0; j < bs; j++, i++, o++) {
678
            int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
679
                y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
680

    
681
            buf[o >> 1] = (x << (4 * (o & 1))) |
682
                (buf[o >> 1] & (0xF << (4 * !(o & 1))));
683
            buf[i >> 1] = (y << (4 * (i & 1))) |
684
                (buf[i >> 1] & (0xF << (4 * !(i & 1))));
685
        }
686
    }
687
}
688

    
689
int
690
ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
691
                    AVStream *st, RMStream *ast, int len, AVPacket *pkt,
692
                    int *seq, int *flags, int64_t *timestamp)
693
{
694
    RMDemuxContext *rm = s->priv_data;
695

    
696
    if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
697
        rm->current_stream= st->id;
698
        if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))
699
            return -1; //got partial frame
700
    } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
701
        if ((st->codec->codec_id == CODEC_ID_RA_288) ||
702
            (st->codec->codec_id == CODEC_ID_COOK) ||
703
            (st->codec->codec_id == CODEC_ID_ATRAC3) ||
704
            (st->codec->codec_id == CODEC_ID_SIPR)) {
705
            int x;
706
            int sps = ast->sub_packet_size;
707
            int cfs = ast->coded_framesize;
708
            int h = ast->sub_packet_h;
709
            int y = ast->sub_packet_cnt;
710
            int w = ast->audio_framesize;
711

    
712
            if (*flags & 2)
713
                y = ast->sub_packet_cnt = 0;
714
            if (!y)
715
                ast->audiotimestamp = *timestamp;
716

    
717
            switch(st->codec->codec_id) {
718
                case CODEC_ID_RA_288:
719
                    for (x = 0; x < h/2; x++)
720
                        get_buffer(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
721
                    break;
722
                case CODEC_ID_ATRAC3:
723
                case CODEC_ID_COOK:
724
                    for (x = 0; x < w/sps; x++)
725
                        get_buffer(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
726
                    break;
727
                case CODEC_ID_SIPR:
728
                    get_buffer(pb, ast->pkt.data + y * w, w);
729
                    break;
730
            }
731

    
732
            if (++(ast->sub_packet_cnt) < h)
733
                return -1;
734
            if (st->codec->codec_id == CODEC_ID_SIPR)
735
                rm_reorder_sipr_data(ast);
736

    
737
             ast->sub_packet_cnt = 0;
738
             rm->audio_stream_num = st->index;
739
             rm->audio_pkt_cnt = h * w / st->codec->block_align;
740
        } else if (st->codec->codec_id == CODEC_ID_AAC) {
741
            int x;
742
            rm->audio_stream_num = st->index;
743
            ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
744
            if (ast->sub_packet_cnt) {
745
                for (x = 0; x < ast->sub_packet_cnt; x++)
746
                    ast->sub_packet_lengths[x] = get_be16(pb);
747
                rm->audio_pkt_cnt = ast->sub_packet_cnt;
748
                ast->audiotimestamp = *timestamp;
749
            } else
750
                return -1;
751
        } else {
752
            av_get_packet(pb, pkt, len);
753
            rm_ac3_swap_bytes(st, pkt);
754
        }
755
    } else
756
        av_get_packet(pb, pkt, len);
757

    
758
    pkt->stream_index = st->index;
759

    
760
#if 0
761
    if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
762
        if(st->codec->codec_id == CODEC_ID_RV20){
763
            int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
764
            av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
765

766
            seq |= (*timestamp&~0x3FFF);
767
            if(seq - *timestamp >  0x2000) seq -= 0x4000;
768
            if(seq - *timestamp < -0x2000) seq += 0x4000;
769
        }
770
    }
771
#endif
772

    
773
    pkt->pts= *timestamp;
774
    if (*flags & 2)
775
        pkt->flags |= PKT_FLAG_KEY;
776

    
777
    return st->codec->codec_type == CODEC_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
778
}
779

    
780
int
781
ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
782
                      AVStream *st, RMStream *ast, AVPacket *pkt)
783
{
784
    RMDemuxContext *rm = s->priv_data;
785

    
786
    assert (rm->audio_pkt_cnt > 0);
787

    
788
    if (st->codec->codec_id == CODEC_ID_AAC)
789
        av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
790
    else {
791
        av_new_packet(pkt, st->codec->block_align);
792
        memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
793
               (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
794
               st->codec->block_align);
795
    }
796
    rm->audio_pkt_cnt--;
797
    if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
798
        ast->audiotimestamp = AV_NOPTS_VALUE;
799
        pkt->flags = PKT_FLAG_KEY;
800
    } else
801
        pkt->flags = 0;
802
    pkt->stream_index = st->index;
803

    
804
    return rm->audio_pkt_cnt;
805
}
806

    
807
static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
808
{
809
    RMDemuxContext *rm = s->priv_data;
810
    AVStream *st;
811
    int i, len, res, seq = 1;
812
    int64_t timestamp, pos;
813
    int old_flags, flags;
814

    
815
    for (;;) {
816
        if (rm->audio_pkt_cnt) {
817
            // If there are queued audio packet return them first
818
            st = s->streams[rm->audio_stream_num];
819
            ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
820
        } else {
821
            if (rm->old_format) {
822
                RMStream *ast;
823

    
824
                st = s->streams[0];
825
                ast = st->priv_data;
826
                timestamp = AV_NOPTS_VALUE;
827
                len = !ast->audio_framesize ? RAW_PACKET_SIZE :
828
                    ast->coded_framesize * ast->sub_packet_h / 2;
829
                flags = (seq++ == 1) ? 2 : 0;
830
            } else {
831
                len=sync(s, &timestamp, &flags, &i, &pos);
832
                if (len > 0)
833
                    st = s->streams[i];
834
            }
835

    
836
            if(len<0 || url_feof(s->pb))
837
                return AVERROR(EIO);
838

    
839
            old_flags = flags;
840
            res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
841
                                      &seq, &flags, &timestamp);
842
            if((old_flags&2) && (seq&0x7F) == 1)
843
                av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
844
            if (res)
845
                continue;
846
        }
847

    
848
        if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
849
           || st->discard >= AVDISCARD_ALL){
850
            av_free_packet(pkt);
851
        } else
852
            break;
853
    }
854

    
855
    return 0;
856
}
857

    
858
static int rm_read_close(AVFormatContext *s)
859
{
860
    int i;
861

    
862
    for (i=0;i<s->nb_streams;i++)
863
        ff_rm_free_rmstream(s->streams[i]->priv_data);
864

    
865
    return 0;
866
}
867

    
868
static int rm_probe(AVProbeData *p)
869
{
870
    /* check file header */
871
    if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
872
         p->buf[2] == 'M' && p->buf[3] == 'F' &&
873
         p->buf[4] == 0 && p->buf[5] == 0) ||
874
        (p->buf[0] == '.' && p->buf[1] == 'r' &&
875
         p->buf[2] == 'a' && p->buf[3] == 0xfd))
876
        return AVPROBE_SCORE_MAX;
877
    else
878
        return 0;
879
}
880

    
881
static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
882
                               int64_t *ppos, int64_t pos_limit)
883
{
884
    RMDemuxContext *rm = s->priv_data;
885
    int64_t pos, dts;
886
    int stream_index2, flags, len, h;
887

    
888
    pos = *ppos;
889

    
890
    if(rm->old_format)
891
        return AV_NOPTS_VALUE;
892

    
893
    url_fseek(s->pb, pos, SEEK_SET);
894
    rm->remaining_len=0;
895
    for(;;){
896
        int seq=1;
897
        AVStream *st;
898

    
899
        len=sync(s, &dts, &flags, &stream_index2, &pos);
900
        if(len<0)
901
            return AV_NOPTS_VALUE;
902

    
903
        st = s->streams[stream_index2];
904
        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
905
            h= get_byte(s->pb); len--;
906
            if(!(h & 0x40)){
907
                seq = get_byte(s->pb); len--;
908
            }
909
        }
910

    
911
        if((flags&2) && (seq&0x7F) == 1){
912
//            av_log(s, AV_LOG_DEBUG, "%d %d-%d %"PRId64" %d\n", flags, stream_index2, stream_index, dts, seq);
913
            av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
914
            if(stream_index2 == stream_index)
915
                break;
916
        }
917

    
918
        url_fskip(s->pb, len);
919
    }
920
    *ppos = pos;
921
    return dts;
922
}
923

    
924
AVInputFormat rm_demuxer = {
925
    "rm",
926
    NULL_IF_CONFIG_SMALL("RealMedia format"),
927
    sizeof(RMDemuxContext),
928
    rm_probe,
929
    rm_read_header,
930
    rm_read_packet,
931
    rm_read_close,
932
    NULL,
933
    rm_read_dts,
934
};
935

    
936
AVInputFormat rdt_demuxer = {
937
    "rdt",
938
    NULL_IF_CONFIG_SMALL("RDT demuxer"),
939
    sizeof(RMDemuxContext),
940
    NULL,
941
    NULL,
942
    NULL,
943
    rm_read_close,
944
};