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ffmpeg / libavformat / mxfdec.c @ 8a47ad5e

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1
/*
2
 * MXF demuxer.
3
 * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>.
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
 *
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 * 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.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * 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
/*
23
 * References
24
 * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
25
 * SMPTE 377M MXF File Format Specifications
26
 * SMPTE 378M Operational Pattern 1a
27
 * SMPTE 379M MXF Generic Container
28
 * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
29
 * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container
30
 * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container
31
 *
32
 * Principle
33
 * Search for Track numbers which will identify essence element KLV packets.
34
 * Search for SourcePackage which define tracks which contains Track numbers.
35
 * Material Package contains tracks with reference to SourcePackage tracks.
36
 * Search for Descriptors (Picture, Sound) which contains codec info and parameters.
37
 * Assign Descriptors to correct Tracks.
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 *
39
 * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.
40
 * Metadata parsing resolves Strong References to objects.
41
 *
42
 * Simple demuxer, only OP1A supported and some files might not work at all.
43
 * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1
44
 */
45

    
46
//#define DEBUG
47

    
48
#include "libavutil/aes.h"
49
#include "mxf.h"
50

    
51
typedef struct {
52
    UID uid;
53
    enum MXFMetadataSetType type;
54
    UID source_container_ul;
55
} MXFCryptoContext;
56

    
57
typedef struct {
58
    UID uid;
59
    enum MXFMetadataSetType type;
60
    UID source_package_uid;
61
    UID data_definition_ul;
62
    int64_t duration;
63
    int64_t start_position;
64
    int source_track_id;
65
} MXFStructuralComponent;
66

    
67
typedef struct {
68
    UID uid;
69
    enum MXFMetadataSetType type;
70
    UID data_definition_ul;
71
    UID *structural_components_refs;
72
    int structural_components_count;
73
    int64_t duration;
74
} MXFSequence;
75

    
76
typedef struct {
77
    UID uid;
78
    enum MXFMetadataSetType type;
79
    MXFSequence *sequence; /* mandatory, and only one */
80
    UID sequence_ref;
81
    int track_id;
82
    uint8_t track_number[4];
83
    AVRational edit_rate;
84
} MXFTrack;
85

    
86
typedef struct {
87
    UID uid;
88
    enum MXFMetadataSetType type;
89
    UID essence_container_ul;
90
    UID essence_codec_ul;
91
    AVRational sample_rate;
92
    AVRational aspect_ratio;
93
    int width;
94
    int height;
95
    int channels;
96
    int bits_per_sample;
97
    UID *sub_descriptors_refs;
98
    int sub_descriptors_count;
99
    int linked_track_id;
100
    uint8_t *extradata;
101
    int extradata_size;
102
} MXFDescriptor;
103

    
104
typedef struct {
105
    UID uid;
106
    enum MXFMetadataSetType type;
107
} MXFIndexTableSegment;
108

    
109
typedef struct {
110
    UID uid;
111
    enum MXFMetadataSetType type;
112
    UID package_uid;
113
    UID *tracks_refs;
114
    int tracks_count;
115
    MXFDescriptor *descriptor; /* only one */
116
    UID descriptor_ref;
117
} MXFPackage;
118

    
119
typedef struct {
120
    UID uid;
121
    enum MXFMetadataSetType type;
122
} MXFMetadataSet;
123

    
124
typedef struct {
125
    UID *packages_refs;
126
    int packages_count;
127
    MXFMetadataSet **metadata_sets;
128
    int metadata_sets_count;
129
    AVFormatContext *fc;
130
    struct AVAES *aesc;
131
    uint8_t *local_tags;
132
    int local_tags_count;
133
} MXFContext;
134

    
135
enum MXFWrappingScheme {
136
    Frame,
137
    Clip,
138
};
139

    
140
typedef struct {
141
    const UID key;
142
    int (*read)();
143
    int ctx_size;
144
    enum MXFMetadataSetType type;
145
} MXFMetadataReadTableEntry;
146

    
147
/* partial keys to match */
148
static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
149
static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
150
static const uint8_t mxf_klv_key[]                         = { 0x06,0x0e,0x2b,0x34 };
151
/* complete keys to match */
152
static const uint8_t mxf_crypto_source_container_ul[]      = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x09,0x06,0x01,0x01,0x02,0x02,0x00,0x00,0x00 };
153
static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
154
static const uint8_t mxf_encrypted_essence_container[]     = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };
155
static const uint8_t mxf_sony_mpeg4_extradata[]            = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };
156

    
157
#define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
158

    
159
static int64_t klv_decode_ber_length(ByteIOContext *pb)
160
{
161
    uint64_t size = get_byte(pb);
162
    if (size & 0x80) { /* long form */
163
        int bytes_num = size & 0x7f;
164
        /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
165
        if (bytes_num > 8)
166
            return -1;
167
        size = 0;
168
        while (bytes_num--)
169
            size = size << 8 | get_byte(pb);
170
    }
171
    return size;
172
}
173

    
174
static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
175
{
176
    int i, b;
177
    for (i = 0; i < size && !url_feof(pb); i++) {
178
        b = get_byte(pb);
179
        if (b == key[0])
180
            i = 0;
181
        else if (b != key[i])
182
            i = -1;
183
    }
184
    return i == size;
185
}
186

    
187
static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
188
{
189
    if (!mxf_read_sync(pb, mxf_klv_key, 4))
190
        return -1;
191
    klv->offset = url_ftell(pb) - 4;
192
    memcpy(klv->key, mxf_klv_key, 4);
193
    get_buffer(pb, klv->key + 4, 12);
194
    klv->length = klv_decode_ber_length(pb);
195
    return klv->length == -1 ? -1 : 0;
196
}
197

    
198
static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
199
{
200
    int i;
201

    
202
    for (i = 0; i < s->nb_streams; i++) {
203
        MXFTrack *track = s->streams[i]->priv_data;
204
        /* SMPTE 379M 7.3 */
205
        if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
206
            return i;
207
    }
208
    /* return 0 if only one stream, for OP Atom files with 0 as track number */
209
    return s->nb_streams == 1 ? 0 : -1;
210
}
211

    
212
/* XXX: use AVBitStreamFilter */
213
static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
214
{
215
    uint8_t buffer[61444];
216
    const uint8_t *buf_ptr, *end_ptr;
217
    uint8_t *data_ptr;
218
    int i;
219

    
220
    if (length > 61444) /* worst case PAL 1920 samples 8 channels */
221
        return -1;
222
    get_buffer(pb, buffer, length);
223
    av_new_packet(pkt, length);
224
    data_ptr = pkt->data;
225
    end_ptr = buffer + length;
226
    buf_ptr = buffer + 4; /* skip SMPTE 331M header */
227
    for (; buf_ptr < end_ptr; ) {
228
        for (i = 0; i < st->codec->channels; i++) {
229
            uint32_t sample = bytestream_get_le32(&buf_ptr);
230
            if (st->codec->bits_per_coded_sample == 24)
231
                bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);
232
            else
233
                bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);
234
        }
235
        buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M
236
    }
237
    pkt->size = data_ptr - pkt->data;
238
    return 0;
239
}
240

    
241
static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)
242
{
243
    static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};
244
    MXFContext *mxf = s->priv_data;
245
    ByteIOContext *pb = s->pb;
246
    int64_t end = url_ftell(pb) + klv->length;
247
    uint64_t size;
248
    uint64_t orig_size;
249
    uint64_t plaintext_size;
250
    uint8_t ivec[16];
251
    uint8_t tmpbuf[16];
252
    int index;
253

    
254
    if (!mxf->aesc && s->key && s->keylen == 16) {
255
        mxf->aesc = av_malloc(av_aes_size);
256
        if (!mxf->aesc)
257
            return -1;
258
        av_aes_init(mxf->aesc, s->key, 128, 1);
259
    }
260
    // crypto context
261
    url_fskip(pb, klv_decode_ber_length(pb));
262
    // plaintext offset
263
    klv_decode_ber_length(pb);
264
    plaintext_size = get_be64(pb);
265
    // source klv key
266
    klv_decode_ber_length(pb);
267
    get_buffer(pb, klv->key, 16);
268
    if (!IS_KLV_KEY(klv, mxf_essence_element_key))
269
        return -1;
270
    index = mxf_get_stream_index(s, klv);
271
    if (index < 0)
272
        return -1;
273
    // source size
274
    klv_decode_ber_length(pb);
275
    orig_size = get_be64(pb);
276
    if (orig_size < plaintext_size)
277
        return -1;
278
    // enc. code
279
    size = klv_decode_ber_length(pb);
280
    if (size < 32 || size - 32 < orig_size)
281
        return -1;
282
    get_buffer(pb, ivec, 16);
283
    get_buffer(pb, tmpbuf, 16);
284
    if (mxf->aesc)
285
        av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);
286
    if (memcmp(tmpbuf, checkv, 16))
287
        av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");
288
    size -= 32;
289
    av_get_packet(pb, pkt, size);
290
    size -= plaintext_size;
291
    if (mxf->aesc)
292
        av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],
293
                     &pkt->data[plaintext_size], size >> 4, ivec, 1);
294
    pkt->size = orig_size;
295
    pkt->stream_index = index;
296
    url_fskip(pb, end - url_ftell(pb));
297
    return 0;
298
}
299

    
300
static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
301
{
302
    KLVPacket klv;
303

    
304
    while (!url_feof(s->pb)) {
305
        if (klv_read_packet(&klv, s->pb) < 0)
306
            return -1;
307
        PRINT_KEY(s, "read packet", klv.key);
308
        dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset);
309
        if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
310
            int res = mxf_decrypt_triplet(s, pkt, &klv);
311
            if (res < 0) {
312
                av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
313
                return -1;
314
            }
315
            return 0;
316
        }
317
        if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
318
            int index = mxf_get_stream_index(s, &klv);
319
            if (index < 0) {
320
                av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));
321
                goto skip;
322
            }
323
            if (s->streams[index]->discard == AVDISCARD_ALL)
324
                goto skip;
325
            /* check for 8 channels AES3 element */
326
            if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
327
                if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {
328
                    av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
329
                    return -1;
330
                }
331
            } else
332
                av_get_packet(s->pb, pkt, klv.length);
333
            pkt->stream_index = index;
334
            pkt->pos = klv.offset;
335
            return 0;
336
        } else
337
        skip:
338
            url_fskip(s->pb, klv.length);
339
    }
340
    return AVERROR(EIO);
341
}
342

    
343
static int mxf_read_primer_pack(MXFContext *mxf)
344
{
345
    ByteIOContext *pb = mxf->fc->pb;
346
    int item_num = get_be32(pb);
347
    int item_len = get_be32(pb);
348

    
349
    if (item_len != 18) {
350
        av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n");
351
        return -1;
352
    }
353
    if (item_num > UINT_MAX / item_len)
354
        return -1;
355
    mxf->local_tags_count = item_num;
356
    mxf->local_tags = av_malloc(item_num*item_len);
357
    if (!mxf->local_tags)
358
        return -1;
359
    get_buffer(pb, mxf->local_tags, item_num*item_len);
360
    return 0;
361
}
362

    
363
static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
364
{
365
    mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
366
    if (!mxf->metadata_sets)
367
        return -1;
368
    mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
369
    mxf->metadata_sets_count++;
370
    return 0;
371
}
372

    
373
static int mxf_read_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag, int size, UID uid)
374
{
375
    if (size != 16)
376
        return -1;
377
    if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))
378
        get_buffer(pb, cryptocontext->source_container_ul, 16);
379
    return 0;
380
}
381

    
382
static int mxf_read_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)
383
{
384
    switch (tag) {
385
    case 0x1901:
386
        mxf->packages_count = get_be32(pb);
387
        if (mxf->packages_count >= UINT_MAX / sizeof(UID))
388
            return -1;
389
        mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
390
        if (!mxf->packages_refs)
391
            return -1;
392
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
393
        get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
394
        break;
395
    }
396
    return 0;
397
}
398

    
399
static int mxf_read_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)
400
{
401
    switch(tag) {
402
    case 0x0202:
403
        source_clip->duration = get_be64(pb);
404
        break;
405
    case 0x1201:
406
        source_clip->start_position = get_be64(pb);
407
        break;
408
    case 0x1101:
409
        /* UMID, only get last 16 bytes */
410
        url_fskip(pb, 16);
411
        get_buffer(pb, source_clip->source_package_uid, 16);
412
        break;
413
    case 0x1102:
414
        source_clip->source_track_id = get_be32(pb);
415
        break;
416
    }
417
    return 0;
418
}
419

    
420
static int mxf_read_material_package(MXFPackage *package, ByteIOContext *pb, int tag)
421
{
422
    switch(tag) {
423
    case 0x4403:
424
        package->tracks_count = get_be32(pb);
425
        if (package->tracks_count >= UINT_MAX / sizeof(UID))
426
            return -1;
427
        package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
428
        if (!package->tracks_refs)
429
            return -1;
430
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
431
        get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
432
        break;
433
    }
434
    return 0;
435
}
436

    
437
static int mxf_read_track(MXFTrack *track, ByteIOContext *pb, int tag)
438
{
439
    switch(tag) {
440
    case 0x4801:
441
        track->track_id = get_be32(pb);
442
        break;
443
    case 0x4804:
444
        get_buffer(pb, track->track_number, 4);
445
        break;
446
    case 0x4B01:
447
        track->edit_rate.den = get_be32(pb);
448
        track->edit_rate.num = get_be32(pb);
449
        break;
450
    case 0x4803:
451
        get_buffer(pb, track->sequence_ref, 16);
452
        break;
453
    }
454
    return 0;
455
}
456

    
457
static int mxf_read_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)
458
{
459
    switch(tag) {
460
    case 0x0202:
461
        sequence->duration = get_be64(pb);
462
        break;
463
    case 0x0201:
464
        get_buffer(pb, sequence->data_definition_ul, 16);
465
        break;
466
    case 0x1001:
467
        sequence->structural_components_count = get_be32(pb);
468
        if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
469
            return -1;
470
        sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
471
        if (!sequence->structural_components_refs)
472
            return -1;
473
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
474
        get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
475
        break;
476
    }
477
    return 0;
478
}
479

    
480
static int mxf_read_source_package(MXFPackage *package, ByteIOContext *pb, int tag)
481
{
482
    switch(tag) {
483
    case 0x4403:
484
        package->tracks_count = get_be32(pb);
485
        if (package->tracks_count >= UINT_MAX / sizeof(UID))
486
            return -1;
487
        package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
488
        if (!package->tracks_refs)
489
            return -1;
490
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
491
        get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
492
        break;
493
    case 0x4401:
494
        /* UMID, only get last 16 bytes */
495
        url_fskip(pb, 16);
496
        get_buffer(pb, package->package_uid, 16);
497
        break;
498
    case 0x4701:
499
        get_buffer(pb, package->descriptor_ref, 16);
500
        break;
501
    }
502
    return 0;
503
}
504

    
505
static int mxf_read_index_table_segment(MXFIndexTableSegment *segment, ByteIOContext *pb, int tag)
506
{
507
    switch(tag) {
508
    case 0x3F05: dprintf(NULL, "EditUnitByteCount %d\n", get_be32(pb)); break;
509
    case 0x3F06: dprintf(NULL, "IndexSID %d\n", get_be32(pb)); break;
510
    case 0x3F07: dprintf(NULL, "BodySID %d\n", get_be32(pb)); break;
511
    case 0x3F0B: dprintf(NULL, "IndexEditRate %d/%d\n", get_be32(pb), get_be32(pb)); break;
512
    case 0x3F0C: dprintf(NULL, "IndexStartPosition %lld\n", get_be64(pb)); break;
513
    case 0x3F0D: dprintf(NULL, "IndexDuration %lld\n", get_be64(pb)); break;
514
    }
515
    return 0;
516
}
517

    
518
static void mxf_read_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
519
{
520
    int code;
521

    
522
    do {
523
        code = get_byte(pb);
524
        dprintf(NULL, "pixel layout: code %#x\n", code);
525
        switch (code) {
526
        case 0x52: /* R */
527
            descriptor->bits_per_sample += get_byte(pb);
528
            break;
529
        case 0x47: /* G */
530
            descriptor->bits_per_sample += get_byte(pb);
531
            break;
532
        case 0x42: /* B */
533
            descriptor->bits_per_sample += get_byte(pb);
534
            break;
535
        default:
536
            get_byte(pb);
537
        }
538
    } while (code != 0); /* SMPTE 377M E.2.46 */
539
}
540

    
541
static int mxf_read_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size, UID uid)
542
{
543
    switch(tag) {
544
    case 0x3F01:
545
        descriptor->sub_descriptors_count = get_be32(pb);
546
        if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
547
            return -1;
548
        descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
549
        if (!descriptor->sub_descriptors_refs)
550
            return -1;
551
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
552
        get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
553
        break;
554
    case 0x3004:
555
        get_buffer(pb, descriptor->essence_container_ul, 16);
556
        break;
557
    case 0x3006:
558
        descriptor->linked_track_id = get_be32(pb);
559
        break;
560
    case 0x3201: /* PictureEssenceCoding */
561
        get_buffer(pb, descriptor->essence_codec_ul, 16);
562
        break;
563
    case 0x3203:
564
        descriptor->width = get_be32(pb);
565
        break;
566
    case 0x3202:
567
        descriptor->height = get_be32(pb);
568
        break;
569
    case 0x320E:
570
        descriptor->aspect_ratio.num = get_be32(pb);
571
        descriptor->aspect_ratio.den = get_be32(pb);
572
        break;
573
    case 0x3D03:
574
        descriptor->sample_rate.num = get_be32(pb);
575
        descriptor->sample_rate.den = get_be32(pb);
576
        break;
577
    case 0x3D06: /* SoundEssenceCompression */
578
        get_buffer(pb, descriptor->essence_codec_ul, 16);
579
        break;
580
    case 0x3D07:
581
        descriptor->channels = get_be32(pb);
582
        break;
583
    case 0x3D01:
584
        descriptor->bits_per_sample = get_be32(pb);
585
        break;
586
    case 0x3401:
587
        mxf_read_pixel_layout(pb, descriptor);
588
        break;
589
    default:
590
        /* Private uid used by SONY C0023S01.mxf */
591
        if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {
592
            descriptor->extradata = av_malloc(size);
593
            if (!descriptor->extradata)
594
                return -1;
595
            descriptor->extradata_size = size;
596
            get_buffer(pb, descriptor->extradata, size);
597
        }
598
        break;
599
    }
600
    return 0;
601
}
602

    
603
/*
604
 * Match an uid independently of the version byte and up to len common bytes
605
 * Returns: boolean
606
 */
607
static int mxf_match_uid(const UID key, const UID uid, int len)
608
{
609
    int i;
610
    for (i = 0; i < len; i++) {
611
        if (i != 7 && key[i] != uid[i])
612
            return 0;
613
    }
614
    return 1;
615
}
616

    
617
static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
618
{
619
    while (uls->id != CODEC_ID_NONE) {
620
        if(mxf_match_uid(uls->uid, *uid, uls->matching_len))
621
            break;
622
        uls++;
623
    }
624
    return uls;
625
}
626

    
627
static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)
628
{
629
    while (uls->type != CODEC_TYPE_DATA) {
630
        if(mxf_match_uid(uls->uid, *uid, 16))
631
            break;
632
        uls++;
633
    }
634
    return uls->type;
635
}
636

    
637
static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
638
{
639
    int i;
640

    
641
    if (!strong_ref)
642
        return NULL;
643
    for (i = 0; i < mxf->metadata_sets_count; i++) {
644
        if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
645
            (type == AnyType || mxf->metadata_sets[i]->type == type)) {
646
            return mxf->metadata_sets[i];
647
        }
648
    }
649
    return NULL;
650
}
651

    
652
static const MXFCodecUL mxf_essence_container_uls[] = {
653
    // video essence container uls
654
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */
655
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */
656
    // sound essence container uls
657
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */
658
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */
659
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */
660
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },
661
};
662

    
663
static int mxf_parse_structural_metadata(MXFContext *mxf)
664
{
665
    MXFPackage *material_package = NULL;
666
    MXFPackage *temp_package = NULL;
667
    int i, j, k;
668

    
669
    dprintf(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);
670
    /* TODO: handle multiple material packages (OP3x) */
671
    for (i = 0; i < mxf->packages_count; i++) {
672
        material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
673
        if (material_package) break;
674
    }
675
    if (!material_package) {
676
        av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
677
        return -1;
678
    }
679

    
680
    for (i = 0; i < material_package->tracks_count; i++) {
681
        MXFPackage *source_package = NULL;
682
        MXFTrack *material_track = NULL;
683
        MXFTrack *source_track = NULL;
684
        MXFTrack *temp_track = NULL;
685
        MXFDescriptor *descriptor = NULL;
686
        MXFStructuralComponent *component = NULL;
687
        UID *essence_container_ul = NULL;
688
        const MXFCodecUL *codec_ul = NULL;
689
        const MXFCodecUL *container_ul = NULL;
690
        AVStream *st;
691

    
692
        if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
693
            av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
694
            continue;
695
        }
696

    
697
        if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
698
            av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
699
            return -1;
700
        }
701

    
702
        /* TODO: handle multiple source clips */
703
        for (j = 0; j < material_track->sequence->structural_components_count; j++) {
704
            /* TODO: handle timecode component */
705
            component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
706
            if (!component)
707
                continue;
708

    
709
            for (k = 0; k < mxf->packages_count; k++) {
710
                temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
711
                if (!temp_package)
712
                    continue;
713
                if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
714
                    source_package = temp_package;
715
                    break;
716
                }
717
            }
718
            if (!source_package) {
719
                av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
720
                break;
721
            }
722
            for (k = 0; k < source_package->tracks_count; k++) {
723
                if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
724
                    av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
725
                    return -1;
726
                }
727
                if (temp_track->track_id == component->source_track_id) {
728
                    source_track = temp_track;
729
                    break;
730
                }
731
            }
732
            if (!source_track) {
733
                av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
734
                break;
735
            }
736
        }
737
        if (!source_track)
738
            continue;
739

    
740
        st = av_new_stream(mxf->fc, source_track->track_id);
741
        if (!st) {
742
            av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
743
            return -1;
744
        }
745
        st->priv_data = source_track;
746
        st->duration = component->duration;
747
        if (st->duration == -1)
748
            st->duration = AV_NOPTS_VALUE;
749
        st->start_time = component->start_position;
750
        av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
751

    
752
        if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
753
            av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
754
            return -1;
755
        }
756

    
757
        PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);
758
        st->codec->codec_type = mxf_get_codec_type(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
759

    
760
        source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
761
        if (source_package->descriptor) {
762
            if (source_package->descriptor->type == MultipleDescriptor) {
763
                for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
764
                    MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
765

    
766
                    if (!sub_descriptor) {
767
                        av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
768
                        continue;
769
                    }
770
                    if (sub_descriptor->linked_track_id == source_track->track_id) {
771
                        descriptor = sub_descriptor;
772
                        break;
773
                    }
774
                }
775
            } else if (source_package->descriptor->type == Descriptor)
776
                descriptor = source_package->descriptor;
777
        }
778
        if (!descriptor) {
779
            av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
780
            continue;
781
        }
782
        PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);
783
        PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);
784
        essence_container_ul = &descriptor->essence_container_ul;
785
        /* HACK: replacing the original key with mxf_encrypted_essence_container
786
         * is not allowed according to s429-6, try to find correct information anyway */
787
        if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {
788
            av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");
789
            for (k = 0; k < mxf->metadata_sets_count; k++) {
790
                MXFMetadataSet *metadata = mxf->metadata_sets[k];
791
                if (metadata->type == CryptoContext) {
792
                    essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;
793
                    break;
794
                }
795
            }
796
        }
797
        /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
798
        codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);
799
        st->codec->codec_id = codec_ul->id;
800
        if (descriptor->extradata) {
801
            st->codec->extradata = descriptor->extradata;
802
            st->codec->extradata_size = descriptor->extradata_size;
803
        }
804
        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
805
            container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);
806
            if (st->codec->codec_id == CODEC_ID_NONE)
807
                st->codec->codec_id = container_ul->id;
808
            st->codec->width = descriptor->width;
809
            st->codec->height = descriptor->height;
810
            st->codec->bits_per_coded_sample = descriptor->bits_per_sample; /* Uncompressed */
811
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
812
        } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
813
            container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);
814
            if (st->codec->codec_id == CODEC_ID_NONE)
815
                st->codec->codec_id = container_ul->id;
816
            st->codec->channels = descriptor->channels;
817
            st->codec->bits_per_coded_sample = descriptor->bits_per_sample;
818
            st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
819
            /* TODO: implement CODEC_ID_RAWAUDIO */
820
            if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
821
                if (descriptor->bits_per_sample == 24)
822
                    st->codec->codec_id = CODEC_ID_PCM_S24LE;
823
                else if (descriptor->bits_per_sample == 32)
824
                    st->codec->codec_id = CODEC_ID_PCM_S32LE;
825
            } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
826
                if (descriptor->bits_per_sample == 24)
827
                    st->codec->codec_id = CODEC_ID_PCM_S24BE;
828
                else if (descriptor->bits_per_sample == 32)
829
                    st->codec->codec_id = CODEC_ID_PCM_S32BE;
830
            } else if (st->codec->codec_id == CODEC_ID_MP2) {
831
                st->need_parsing = AVSTREAM_PARSE_FULL;
832
            }
833
        }
834
        if (st->codec->codec_type != CODEC_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {
835
            av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n");
836
            st->need_parsing = AVSTREAM_PARSE_FULL;
837
        }
838
    }
839
    return 0;
840
}
841

    
842
static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
843
    { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },
844
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },
845
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },
846
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },
847
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },
848
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },
849
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
850
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */
851
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
852
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
853
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */
854
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
855
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
856
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */
857
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */
858
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },
859
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },
860
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
861
};
862

    
863
static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type)
864
{
865
    ByteIOContext *pb = mxf->fc->pb;
866
    MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
867
    uint64_t klv_end = url_ftell(pb) + klv->length;
868

    
869
    if (!ctx)
870
        return -1;
871
    while (url_ftell(pb) + 4 < klv_end) {
872
        int tag = get_be16(pb);
873
        int size = get_be16(pb); /* KLV specified by 0x53 */
874
        uint64_t next = url_ftell(pb) + size;
875
        UID uid = {0};
876

    
877
        dprintf(mxf->fc, "local tag %#04x size %d\n", tag, size);
878
        if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
879
            av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);
880
            continue;
881
        }
882
        if (tag > 0x7FFF) { /* dynamic tag */
883
            int i;
884
            for (i = 0; i < mxf->local_tags_count; i++) {
885
                int local_tag = AV_RB16(mxf->local_tags+i*18);
886
                if (local_tag == tag) {
887
                    memcpy(uid, mxf->local_tags+i*18+2, 16);
888
                    dprintf(mxf->fc, "local tag %#04x\n", local_tag);
889
                    PRINT_KEY(mxf->fc, "uid", uid);
890
                }
891
            }
892
        }
893
        if (ctx_size && tag == 0x3C0A)
894
            get_buffer(pb, ctx->uid, 16);
895
        else if (read_child(ctx, pb, tag, size, uid) < 0)
896
            return -1;
897

    
898
        url_fseek(pb, next, SEEK_SET);
899
    }
900
    if (ctx_size) ctx->type = type;
901
    return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
902
}
903

    
904
static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
905
{
906
    MXFContext *mxf = s->priv_data;
907
    KLVPacket klv;
908

    
909
    if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {
910
        av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
911
        return -1;
912
    }
913
    url_fseek(s->pb, -14, SEEK_CUR);
914
    mxf->fc = s;
915
    while (!url_feof(s->pb)) {
916
        const MXFMetadataReadTableEntry *metadata;
917

    
918
        if (klv_read_packet(&klv, s->pb) < 0)
919
            return -1;
920
        PRINT_KEY(s, "read header", klv.key);
921
        dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset);
922
        if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
923
            IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
924
            /* FIXME avoid seek */
925
            url_fseek(s->pb, klv.offset, SEEK_SET);
926
            break;
927
        }
928

    
929
        for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
930
            if (IS_KLV_KEY(klv.key, metadata->key)) {
931
                int (*read)() = klv.key[5] == 0x53 ? mxf_read_local_tags : metadata->read;
932
                if (read(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type) < 0) {
933
                    av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
934
                    return -1;
935
                }
936
                break;
937
            }
938
        }
939
        if (!metadata->read)
940
            url_fskip(s->pb, klv.length);
941
    }
942
    return mxf_parse_structural_metadata(mxf);
943
}
944

    
945
static int mxf_read_close(AVFormatContext *s)
946
{
947
    MXFContext *mxf = s->priv_data;
948
    int i;
949

    
950
    av_freep(&mxf->packages_refs);
951
    for (i = 0; i < mxf->metadata_sets_count; i++) {
952
        switch (mxf->metadata_sets[i]->type) {
953
        case MultipleDescriptor:
954
            av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
955
            break;
956
        case Sequence:
957
            av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
958
            break;
959
        case SourcePackage:
960
        case MaterialPackage:
961
            av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
962
            break;
963
        case Track:
964
            mxf->metadata_sets[i] = NULL; /* will be freed later */
965
            break;
966
        default:
967
            break;
968
        }
969
        av_freep(&mxf->metadata_sets[i]);
970
    }
971
    av_freep(&mxf->metadata_sets);
972
    av_freep(&mxf->aesc);
973
    av_freep(&mxf->local_tags);
974
    return 0;
975
}
976

    
977
static int mxf_probe(AVProbeData *p) {
978
    uint8_t *bufp = p->buf;
979
    uint8_t *end = p->buf + p->buf_size;
980

    
981
    if (p->buf_size < sizeof(mxf_header_partition_pack_key))
982
        return 0;
983

    
984
    /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
985
    end -= sizeof(mxf_header_partition_pack_key);
986
    for (; bufp < end; bufp++) {
987
        if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
988
            return AVPROBE_SCORE_MAX;
989
    }
990
    return 0;
991
}
992

    
993
/* rudimentary byte seek */
994
/* XXX: use MXF Index */
995
static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
996
{
997
    AVStream *st = s->streams[stream_index];
998
    int64_t seconds;
999

    
1000
    if (!s->bit_rate)
1001
        return -1;
1002
    if (sample_time < 0)
1003
        sample_time = 0;
1004
    seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
1005
    url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
1006
    av_update_cur_dts(s, st, sample_time);
1007
    return 0;
1008
}
1009

    
1010
AVInputFormat mxf_demuxer = {
1011
    "mxf",
1012
    NULL_IF_CONFIG_SMALL("Material eXchange Format"),
1013
    sizeof(MXFContext),
1014
    mxf_probe,
1015
    mxf_read_header,
1016
    mxf_read_packet,
1017
    mxf_read_close,
1018
    mxf_read_seek,
1019
};