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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
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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
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 * 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.
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 * Search for SourcePackage which define tracks which contains Track numbers.
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 * Material Package contains tracks with reference to SourcePackage tracks.
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 * Search for Descriptors (Picture, Sound) which contains codec info and parameters.
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 * 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 "libavcodec/bytestream.h"
50
#include "avformat.h"
51

    
52
typedef uint8_t UID[16];
53

    
54
enum MXFMetadataSetType {
55
    AnyType,
56
    MaterialPackage,
57
    SourcePackage,
58
    SourceClip,
59
    TimecodeComponent,
60
    Sequence,
61
    MultipleDescriptor,
62
    Descriptor,
63
    Track,
64
    CryptoContext,
65
};
66

    
67
typedef struct {
68
    UID uid;
69
    enum MXFMetadataSetType type;
70
    UID source_container_ul;
71
} MXFCryptoContext;
72

    
73
typedef struct {
74
    UID uid;
75
    enum MXFMetadataSetType type;
76
    UID source_package_uid;
77
    UID data_definition_ul;
78
    int64_t duration;
79
    int64_t start_position;
80
    int source_track_id;
81
} MXFStructuralComponent;
82

    
83
typedef struct {
84
    UID uid;
85
    enum MXFMetadataSetType type;
86
    UID data_definition_ul;
87
    UID *structural_components_refs;
88
    int structural_components_count;
89
    int64_t duration;
90
} MXFSequence;
91

    
92
typedef struct {
93
    UID uid;
94
    enum MXFMetadataSetType type;
95
    MXFSequence *sequence; /* mandatory, and only one */
96
    UID sequence_ref;
97
    int track_id;
98
    uint8_t track_number[4];
99
    AVRational edit_rate;
100
} MXFTrack;
101

    
102
typedef struct {
103
    UID uid;
104
    enum MXFMetadataSetType type;
105
    UID essence_container_ul;
106
    UID essence_codec_ul;
107
    AVRational sample_rate;
108
    AVRational aspect_ratio;
109
    int width;
110
    int height;
111
    int channels;
112
    int bits_per_sample;
113
    UID *sub_descriptors_refs;
114
    int sub_descriptors_count;
115
    int linked_track_id;
116
    uint8_t *extradata;
117
    int extradata_size;
118
} MXFDescriptor;
119

    
120
typedef struct {
121
    UID uid;
122
    enum MXFMetadataSetType type;
123
    UID package_uid;
124
    UID *tracks_refs;
125
    int tracks_count;
126
    MXFDescriptor *descriptor; /* only one */
127
    UID descriptor_ref;
128
} MXFPackage;
129

    
130
typedef struct {
131
    UID uid;
132
    enum MXFMetadataSetType type;
133
} MXFMetadataSet;
134

    
135
typedef struct {
136
    UID *packages_refs;
137
    int packages_count;
138
    MXFMetadataSet **metadata_sets;
139
    int metadata_sets_count;
140
    AVFormatContext *fc;
141
    struct AVAES *aesc;
142
    uint8_t *local_tags;
143
    int local_tags_count;
144
} MXFContext;
145

    
146
typedef struct {
147
    UID key;
148
    offset_t offset;
149
    uint64_t length;
150
} KLVPacket;
151

    
152
enum MXFWrappingScheme {
153
    Frame,
154
    Clip,
155
};
156

    
157
typedef struct {
158
    UID uid;
159
    unsigned matching_len;
160
    enum CodecID id;
161
} MXFCodecUL;
162

    
163
typedef struct {
164
    UID uid;
165
    enum CodecType type;
166
} MXFDataDefinitionUL;
167

    
168
typedef struct {
169
    const UID key;
170
    int (*read)();
171
    int ctx_size;
172
    enum MXFMetadataSetType type;
173
} MXFMetadataReadTableEntry;
174

    
175
/* partial keys to match */
176
static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
177
static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
178
static const uint8_t mxf_klv_key[]                         = { 0x06,0x0e,0x2b,0x34 };
179
/* complete keys to match */
180
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 };
181
static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
182
static const uint8_t mxf_encrypted_essence_container[]     = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };
183
static const uint8_t mxf_sony_mpeg4_extradata[]            = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };
184

    
185
#define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
186

    
187
#define PRINT_KEY(pc, s, x) dprintf(pc, "%s %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n", s, \
188
                             (x)[0], (x)[1], (x)[2], (x)[3], (x)[4], (x)[5], (x)[6], (x)[7], (x)[8], (x)[9], (x)[10], (x)[11], (x)[12], (x)[13], (x)[14], (x)[15])
189

    
190
static int64_t klv_decode_ber_length(ByteIOContext *pb)
191
{
192
    uint64_t size = get_byte(pb);
193
    if (size & 0x80) { /* long form */
194
        int bytes_num = size & 0x7f;
195
        /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
196
        if (bytes_num > 8)
197
            return -1;
198
        size = 0;
199
        while (bytes_num--)
200
            size = size << 8 | get_byte(pb);
201
    }
202
    return size;
203
}
204

    
205
static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
206
{
207
    int i, b;
208
    for (i = 0; i < size && !url_feof(pb); i++) {
209
        b = get_byte(pb);
210
        if (b == key[0])
211
            i = 0;
212
        else if (b != key[i])
213
            i = -1;
214
    }
215
    return i == size;
216
}
217

    
218
static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
219
{
220
    if (!mxf_read_sync(pb, mxf_klv_key, 4))
221
        return -1;
222
    klv->offset = url_ftell(pb) - 4;
223
    memcpy(klv->key, mxf_klv_key, 4);
224
    get_buffer(pb, klv->key + 4, 12);
225
    klv->length = klv_decode_ber_length(pb);
226
    return klv->length == -1 ? -1 : 0;
227
}
228

    
229
static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
230
{
231
    int i;
232

    
233
    for (i = 0; i < s->nb_streams; i++) {
234
        MXFTrack *track = s->streams[i]->priv_data;
235
        /* SMPTE 379M 7.3 */
236
        if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
237
            return i;
238
    }
239
    /* return 0 if only one stream, for OP Atom files with 0 as track number */
240
    return s->nb_streams == 1 ? 0 : -1;
241
}
242

    
243
/* XXX: use AVBitStreamFilter */
244
static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
245
{
246
    uint8_t buffer[61444];
247
    const uint8_t *buf_ptr, *end_ptr;
248
    uint8_t *data_ptr;
249
    int i;
250

    
251
    if (length > 61444) /* worst case PAL 1920 samples 8 channels */
252
        return -1;
253
    get_buffer(pb, buffer, length);
254
    av_new_packet(pkt, length);
255
    data_ptr = pkt->data;
256
    end_ptr = buffer + length;
257
    buf_ptr = buffer + 4; /* skip SMPTE 331M header */
258
    for (; buf_ptr < end_ptr; ) {
259
        for (i = 0; i < st->codec->channels; i++) {
260
            uint32_t sample = bytestream_get_le32(&buf_ptr);
261
            if (st->codec->bits_per_sample == 24)
262
                bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);
263
            else
264
                bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);
265
        }
266
        buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M
267
    }
268
    pkt->size = data_ptr - pkt->data;
269
    return 0;
270
}
271

    
272
static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)
273
{
274
    static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};
275
    MXFContext *mxf = s->priv_data;
276
    ByteIOContext *pb = s->pb;
277
    offset_t end = url_ftell(pb) + klv->length;
278
    uint64_t size;
279
    uint64_t orig_size;
280
    uint64_t plaintext_size;
281
    uint8_t ivec[16];
282
    uint8_t tmpbuf[16];
283
    int index;
284

    
285
    if (!mxf->aesc && s->key && s->keylen == 16) {
286
        mxf->aesc = av_malloc(av_aes_size);
287
        if (!mxf->aesc)
288
            return -1;
289
        av_aes_init(mxf->aesc, s->key, 128, 1);
290
    }
291
    // crypto context
292
    url_fskip(pb, klv_decode_ber_length(pb));
293
    // plaintext offset
294
    klv_decode_ber_length(pb);
295
    plaintext_size = get_be64(pb);
296
    // source klv key
297
    klv_decode_ber_length(pb);
298
    get_buffer(pb, klv->key, 16);
299
    if (!IS_KLV_KEY(klv, mxf_essence_element_key))
300
        return -1;
301
    index = mxf_get_stream_index(s, klv);
302
    if (index < 0)
303
        return -1;
304
    // source size
305
    klv_decode_ber_length(pb);
306
    orig_size = get_be64(pb);
307
    if (orig_size < plaintext_size)
308
        return -1;
309
    // enc. code
310
    size = klv_decode_ber_length(pb);
311
    if (size < 32 || size - 32 < orig_size)
312
        return -1;
313
    get_buffer(pb, ivec, 16);
314
    get_buffer(pb, tmpbuf, 16);
315
    if (mxf->aesc)
316
        av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);
317
    if (memcmp(tmpbuf, checkv, 16))
318
        av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");
319
    size -= 32;
320
    av_get_packet(pb, pkt, size);
321
    size -= plaintext_size;
322
    if (mxf->aesc)
323
        av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],
324
                     &pkt->data[plaintext_size], size >> 4, ivec, 1);
325
    pkt->size = orig_size;
326
    pkt->stream_index = index;
327
    url_fskip(pb, end - url_ftell(pb));
328
    return 0;
329
}
330

    
331
static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
332
{
333
    KLVPacket klv;
334

    
335
    while (!url_feof(s->pb)) {
336
        if (klv_read_packet(&klv, s->pb) < 0)
337
            return -1;
338
#ifdef DEBUG
339
        PRINT_KEY(s, "read packet", klv.key);
340
#endif
341
        if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
342
            int res = mxf_decrypt_triplet(s, pkt, &klv);
343
            if (res < 0) {
344
                av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
345
                return -1;
346
            }
347
            return 0;
348
        }
349
        if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
350
            int index = mxf_get_stream_index(s, &klv);
351
            if (index < 0) {
352
                av_log(s, AV_LOG_ERROR, "error getting stream index %x\n", AV_RB32(klv.key+12));
353
                goto skip;
354
            }
355
            if (s->streams[index]->discard == AVDISCARD_ALL)
356
                goto skip;
357
            /* check for 8 channels AES3 element */
358
            if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
359
                if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {
360
                    av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
361
                    return -1;
362
                }
363
            } else
364
                av_get_packet(s->pb, pkt, klv.length);
365
            pkt->stream_index = index;
366
            pkt->pos = klv.offset;
367
            return 0;
368
        } else
369
        skip:
370
            url_fskip(s->pb, klv.length);
371
    }
372
    return AVERROR(EIO);
373
}
374

    
375
static int mxf_read_primer_pack(MXFContext *mxf)
376
{
377
    ByteIOContext *pb = mxf->fc->pb;
378
    int item_num = get_be32(pb);
379
    int item_len = get_be32(pb);
380

    
381
    if (item_len != 18) {
382
        av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n");
383
        return -1;
384
    }
385
    if (item_num > UINT_MAX / item_len)
386
        return -1;
387
    mxf->local_tags_count = item_num;
388
    mxf->local_tags = av_malloc(item_num*item_len);
389
    if (!mxf->local_tags)
390
        return -1;
391
    get_buffer(pb, mxf->local_tags, item_num*item_len);
392
    return 0;
393
}
394

    
395
static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
396
{
397
    mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
398
    if (!mxf->metadata_sets)
399
        return -1;
400
    mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
401
    mxf->metadata_sets_count++;
402
    return 0;
403
}
404

    
405
static int mxf_read_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag, int size, UID uid)
406
{
407
    if (size != 16)
408
        return -1;
409
    if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))
410
        get_buffer(pb, cryptocontext->source_container_ul, 16);
411
    return 0;
412
}
413

    
414
static int mxf_read_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)
415
{
416
    switch (tag) {
417
    case 0x1901:
418
        mxf->packages_count = get_be32(pb);
419
        if (mxf->packages_count >= UINT_MAX / sizeof(UID))
420
            return -1;
421
        mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
422
        if (!mxf->packages_refs)
423
            return -1;
424
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
425
        get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
426
        break;
427
    }
428
    return 0;
429
}
430

    
431
static int mxf_read_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)
432
{
433
    switch(tag) {
434
    case 0x0202:
435
        source_clip->duration = get_be64(pb);
436
        break;
437
    case 0x1201:
438
        source_clip->start_position = get_be64(pb);
439
        break;
440
    case 0x1101:
441
        /* UMID, only get last 16 bytes */
442
        url_fskip(pb, 16);
443
        get_buffer(pb, source_clip->source_package_uid, 16);
444
        break;
445
    case 0x1102:
446
        source_clip->source_track_id = get_be32(pb);
447
        break;
448
    }
449
    return 0;
450
}
451

    
452
static int mxf_read_material_package(MXFPackage *package, ByteIOContext *pb, int tag)
453
{
454
    switch(tag) {
455
    case 0x4403:
456
        package->tracks_count = get_be32(pb);
457
        if (package->tracks_count >= UINT_MAX / sizeof(UID))
458
            return -1;
459
        package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
460
        if (!package->tracks_refs)
461
            return -1;
462
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
463
        get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
464
        break;
465
    }
466
    return 0;
467
}
468

    
469
static int mxf_read_track(MXFTrack *track, ByteIOContext *pb, int tag)
470
{
471
    switch(tag) {
472
    case 0x4801:
473
        track->track_id = get_be32(pb);
474
        break;
475
    case 0x4804:
476
        get_buffer(pb, track->track_number, 4);
477
        break;
478
    case 0x4B01:
479
        track->edit_rate.den = get_be32(pb);
480
        track->edit_rate.num = get_be32(pb);
481
        break;
482
    case 0x4803:
483
        get_buffer(pb, track->sequence_ref, 16);
484
        break;
485
    }
486
    return 0;
487
}
488

    
489
static int mxf_read_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)
490
{
491
    switch(tag) {
492
    case 0x0202:
493
        sequence->duration = get_be64(pb);
494
        break;
495
    case 0x0201:
496
        get_buffer(pb, sequence->data_definition_ul, 16);
497
        break;
498
    case 0x1001:
499
        sequence->structural_components_count = get_be32(pb);
500
        if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
501
            return -1;
502
        sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
503
        if (!sequence->structural_components_refs)
504
            return -1;
505
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
506
        get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
507
        break;
508
    }
509
    return 0;
510
}
511

    
512
static int mxf_read_source_package(MXFPackage *package, ByteIOContext *pb, int tag)
513
{
514
    switch(tag) {
515
    case 0x4403:
516
        package->tracks_count = get_be32(pb);
517
        if (package->tracks_count >= UINT_MAX / sizeof(UID))
518
            return -1;
519
        package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
520
        if (!package->tracks_refs)
521
            return -1;
522
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
523
        get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
524
        break;
525
    case 0x4401:
526
        /* UMID, only get last 16 bytes */
527
        url_fskip(pb, 16);
528
        get_buffer(pb, package->package_uid, 16);
529
        break;
530
    case 0x4701:
531
        get_buffer(pb, package->descriptor_ref, 16);
532
        break;
533
    }
534
    return 0;
535
}
536

    
537
static void mxf_read_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
538
{
539
    int code;
540

    
541
    do {
542
        code = get_byte(pb);
543
        dprintf(NULL, "pixel layout: code 0x%x\n", code);
544
        switch (code) {
545
        case 0x52: /* R */
546
            descriptor->bits_per_sample += get_byte(pb);
547
            break;
548
        case 0x47: /* G */
549
            descriptor->bits_per_sample += get_byte(pb);
550
            break;
551
        case 0x42: /* B */
552
            descriptor->bits_per_sample += get_byte(pb);
553
            break;
554
        default:
555
            get_byte(pb);
556
        }
557
    } while (code != 0); /* SMPTE 377M E.2.46 */
558
}
559

    
560
static int mxf_read_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size, UID uid)
561
{
562
    switch(tag) {
563
    case 0x3F01:
564
        descriptor->sub_descriptors_count = get_be32(pb);
565
        if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
566
            return -1;
567
        descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
568
        if (!descriptor->sub_descriptors_refs)
569
            return -1;
570
        url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
571
        get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
572
        break;
573
    case 0x3004:
574
        get_buffer(pb, descriptor->essence_container_ul, 16);
575
        break;
576
    case 0x3006:
577
        descriptor->linked_track_id = get_be32(pb);
578
        break;
579
    case 0x3201: /* PictureEssenceCoding */
580
        get_buffer(pb, descriptor->essence_codec_ul, 16);
581
        break;
582
    case 0x3203:
583
        descriptor->width = get_be32(pb);
584
        break;
585
    case 0x3202:
586
        descriptor->height = get_be32(pb);
587
        break;
588
    case 0x320E:
589
        descriptor->aspect_ratio.num = get_be32(pb);
590
        descriptor->aspect_ratio.den = get_be32(pb);
591
        break;
592
    case 0x3D03:
593
        descriptor->sample_rate.num = get_be32(pb);
594
        descriptor->sample_rate.den = get_be32(pb);
595
        break;
596
    case 0x3D06: /* SoundEssenceCompression */
597
        get_buffer(pb, descriptor->essence_codec_ul, 16);
598
        break;
599
    case 0x3D07:
600
        descriptor->channels = get_be32(pb);
601
        break;
602
    case 0x3D01:
603
        descriptor->bits_per_sample = get_be32(pb);
604
        break;
605
    case 0x3401:
606
        mxf_read_pixel_layout(pb, descriptor);
607
        break;
608
    default:
609
        /* Private uid used by SONY C0023S01.mxf */
610
        if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {
611
            descriptor->extradata = av_malloc(size);
612
            if (!descriptor->extradata)
613
                return -1;
614
            descriptor->extradata_size = size;
615
            get_buffer(pb, descriptor->extradata, size);
616
        }
617
        break;
618
    }
619
    return 0;
620
}
621

    
622
/* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */
623
static const MXFDataDefinitionUL mxf_data_definition_uls[] = {
624
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },
625
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },
626
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },
627
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },
628
};
629

    
630
static const MXFCodecUL mxf_codec_uls[] = {
631
    /* PictureEssenceCoding */
632
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* MP@ML Long GoP */
633
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* D-10 50Mbps PAL */
634
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* MP@HL Long GoP */
635
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* 422P@HL I-Frame */
636
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 }, 14,      CODEC_ID_MPEG4 }, /* XDCAM proxy_pal030926.mxf */
637
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 }, 13,    CODEC_ID_DVVIDEO }, /* DV25 IEC PAL */
638
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 }, 14,   CODEC_ID_JPEG2000 }, /* JPEG2000 Codestream */
639
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 }, 13,   CODEC_ID_RAWVIDEO }, /* Uncompressed */
640
    /* SoundEssenceCompression */
641
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 }, 13,  CODEC_ID_PCM_S16LE }, /* Uncompressed */
642
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 }, 13,  CODEC_ID_PCM_S16LE },
643
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x02,0x02,0x01,0x7E,0x00,0x00,0x00 }, 13,  CODEC_ID_PCM_S16BE }, /* From Omneon MXF file */
644
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x04,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 }, 15,   CODEC_ID_PCM_ALAW }, /* XDCAM Proxy C0023S01.mxf */
645
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 }, 15,        CODEC_ID_AC3 },
646
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 }, 15,        CODEC_ID_MP2 }, /* MP2 or MP3 */
647
  //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 }, 15,    CODEC_ID_DOLBY_E }, /* Dolby-E */
648
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },
649
};
650

    
651
static const MXFCodecUL mxf_picture_essence_container_uls[] = {
652
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */
653
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */
654
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },
655
};
656

    
657
static const MXFCodecUL mxf_sound_essence_container_uls[] = {
658
    { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */
659
    { { 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 */
660
    { { 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 */
661
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },
662
};
663

    
664
/*
665
 * Match an uid independently of the version byte and up to len common bytes
666
 * Returns: boolean
667
 */
668
static int mxf_match_uid(const UID key, const UID uid, int len)
669
{
670
    int i;
671
    for (i = 0; i < len; i++) {
672
        if (i != 7 && key[i] != uid[i])
673
            return 0;
674
    }
675
    return 1;
676
}
677

    
678
static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
679
{
680
    while (uls->id != CODEC_ID_NONE) {
681
        if(mxf_match_uid(uls->uid, *uid, uls->matching_len))
682
            break;
683
        uls++;
684
    }
685
    return uls;
686
}
687

    
688
static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)
689
{
690
    while (uls->type != CODEC_TYPE_DATA) {
691
        if(mxf_match_uid(uls->uid, *uid, 16))
692
            break;
693
        uls++;
694
    }
695
    return uls->type;
696
}
697

    
698
static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
699
{
700
    int i;
701

    
702
    if (!strong_ref)
703
        return NULL;
704
    for (i = 0; i < mxf->metadata_sets_count; i++) {
705
        if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
706
            (type == AnyType || mxf->metadata_sets[i]->type == type)) {
707
            return mxf->metadata_sets[i];
708
        }
709
    }
710
    return NULL;
711
}
712

    
713
static int mxf_parse_structural_metadata(MXFContext *mxf)
714
{
715
    MXFPackage *material_package = NULL;
716
    MXFPackage *temp_package = NULL;
717
    int i, j, k;
718

    
719
    dprintf(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);
720
    /* TODO: handle multiple material packages (OP3x) */
721
    for (i = 0; i < mxf->packages_count; i++) {
722
        material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
723
        if (material_package) break;
724
    }
725
    if (!material_package) {
726
        av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
727
        return -1;
728
    }
729

    
730
    for (i = 0; i < material_package->tracks_count; i++) {
731
        MXFPackage *source_package = NULL;
732
        MXFTrack *material_track = NULL;
733
        MXFTrack *source_track = NULL;
734
        MXFTrack *temp_track = NULL;
735
        MXFDescriptor *descriptor = NULL;
736
        MXFStructuralComponent *component = NULL;
737
        UID *essence_container_ul = NULL;
738
        const MXFCodecUL *codec_ul = NULL;
739
        const MXFCodecUL *container_ul = NULL;
740
        AVStream *st;
741

    
742
        if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
743
            av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
744
            continue;
745
        }
746

    
747
        if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
748
            av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
749
            return -1;
750
        }
751

    
752
        /* TODO: handle multiple source clips */
753
        for (j = 0; j < material_track->sequence->structural_components_count; j++) {
754
            /* TODO: handle timecode component */
755
            component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
756
            if (!component)
757
                continue;
758

    
759
            for (k = 0; k < mxf->packages_count; k++) {
760
                temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
761
                if (!temp_package)
762
                    continue;
763
                if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
764
                    source_package = temp_package;
765
                    break;
766
                }
767
            }
768
            if (!source_package) {
769
                av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
770
                break;
771
            }
772
            for (k = 0; k < source_package->tracks_count; k++) {
773
                if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
774
                    av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
775
                    return -1;
776
                }
777
                if (temp_track->track_id == component->source_track_id) {
778
                    source_track = temp_track;
779
                    break;
780
                }
781
            }
782
            if (!source_track) {
783
                av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
784
                break;
785
            }
786
        }
787
        if (!source_track)
788
            continue;
789

    
790
        st = av_new_stream(mxf->fc, source_track->track_id);
791
        if (!st) {
792
            av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
793
            return -1;
794
        }
795
        st->priv_data = source_track;
796
        st->duration = component->duration;
797
        if (st->duration == -1)
798
            st->duration = AV_NOPTS_VALUE;
799
        st->start_time = component->start_position;
800
        av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
801

    
802
        if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
803
            av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
804
            return -1;
805
        }
806

    
807
#ifdef DEBUG
808
        PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);
809
#endif
810
        st->codec->codec_type = mxf_get_codec_type(mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
811

    
812
        source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
813
        if (source_package->descriptor) {
814
            if (source_package->descriptor->type == MultipleDescriptor) {
815
                for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
816
                    MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
817

    
818
                    if (!sub_descriptor) {
819
                        av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
820
                        continue;
821
                    }
822
                    if (sub_descriptor->linked_track_id == source_track->track_id) {
823
                        descriptor = sub_descriptor;
824
                        break;
825
                    }
826
                }
827
            } else if (source_package->descriptor->type == Descriptor)
828
                descriptor = source_package->descriptor;
829
        }
830
        if (!descriptor) {
831
            av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
832
            continue;
833
        }
834
#ifdef DEBUG
835
        PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);
836
        PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);
837
#endif
838
        essence_container_ul = &descriptor->essence_container_ul;
839
        /* HACK: replacing the original key with mxf_encrypted_essence_container
840
         * is not allowed according to s429-6, try to find correct information anyway */
841
        if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {
842
            av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");
843
            for (k = 0; k < mxf->metadata_sets_count; k++) {
844
                MXFMetadataSet *metadata = mxf->metadata_sets[k];
845
                if (metadata->type == CryptoContext) {
846
                    essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;
847
                    break;
848
                }
849
            }
850
        }
851
        /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
852
        codec_ul = mxf_get_codec_ul(mxf_codec_uls, &descriptor->essence_codec_ul);
853
        st->codec->codec_id = codec_ul->id;
854
        if (descriptor->extradata) {
855
            st->codec->extradata = descriptor->extradata;
856
            st->codec->extradata_size = descriptor->extradata_size;
857
        }
858
        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
859
            container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);
860
            if (st->codec->codec_id == CODEC_ID_NONE)
861
                st->codec->codec_id = container_ul->id;
862
            st->codec->width = descriptor->width;
863
            st->codec->height = descriptor->height;
864
            st->codec->bits_per_sample = descriptor->bits_per_sample; /* Uncompressed */
865
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
866
        } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
867
            container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);
868
            if (st->codec->codec_id == CODEC_ID_NONE)
869
                st->codec->codec_id = container_ul->id;
870
            st->codec->channels = descriptor->channels;
871
            st->codec->bits_per_sample = descriptor->bits_per_sample;
872
            st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
873
            /* TODO: implement CODEC_ID_RAWAUDIO */
874
            if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
875
                if (descriptor->bits_per_sample == 24)
876
                    st->codec->codec_id = CODEC_ID_PCM_S24LE;
877
                else if (descriptor->bits_per_sample == 32)
878
                    st->codec->codec_id = CODEC_ID_PCM_S32LE;
879
            } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
880
                if (descriptor->bits_per_sample == 24)
881
                    st->codec->codec_id = CODEC_ID_PCM_S24BE;
882
                else if (descriptor->bits_per_sample == 32)
883
                    st->codec->codec_id = CODEC_ID_PCM_S32BE;
884
            } else if (st->codec->codec_id == CODEC_ID_MP2) {
885
                st->need_parsing = AVSTREAM_PARSE_FULL;
886
            }
887
        }
888
        if (st->codec->codec_type != CODEC_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {
889
            av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n");
890
            st->need_parsing = AVSTREAM_PARSE_FULL;
891
        }
892
    }
893
    return 0;
894
}
895

    
896
static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
897
    { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },
898
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },
899
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },
900
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },
901
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },
902
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },
903
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
904
    { { 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 */
905
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
906
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
907
    { { 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 */
908
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
909
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
910
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */
911
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */
912
    { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },
913
    { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
914
};
915

    
916
static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type)
917
{
918
    ByteIOContext *pb = mxf->fc->pb;
919
    MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
920
    uint64_t klv_end = url_ftell(pb) + klv->length;
921

    
922
    if (!ctx)
923
        return -1;
924
    while (url_ftell(pb) + 4 < klv_end) {
925
        int tag = get_be16(pb);
926
        int size = get_be16(pb); /* KLV specified by 0x53 */
927
        uint64_t next = url_ftell(pb) + size;
928
        UID uid = {0};
929

    
930
        if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
931
            av_log(mxf->fc, AV_LOG_ERROR, "local tag 0x%04X with 0 size\n", tag);
932
            continue;
933
        }
934
        if (tag > 0x7FFF) { /* dynamic tag */
935
            int i;
936
            for (i = 0; i < mxf->local_tags_count; i++) {
937
                int local_tag = AV_RB16(mxf->local_tags+i*18);
938
                if (local_tag == tag) {
939
                    memcpy(uid, mxf->local_tags+i*18+2, 16);
940
                    dprintf(mxf->fc, "local tag 0x%04X\n", local_tag);
941
#ifdef DEBUG
942
                    PRINT_KEY(mxf->fc, "uid", uid);
943
#endif
944
                }
945
            }
946
        }
947
        if (ctx_size && tag == 0x3C0A)
948
            get_buffer(pb, ctx->uid, 16);
949
        else if (read_child(ctx, pb, tag, size, uid) < 0)
950
            return -1;
951

    
952
        url_fseek(pb, next, SEEK_SET);
953
    }
954
    if (ctx_size) ctx->type = type;
955
    return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
956
}
957

    
958
static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
959
{
960
    MXFContext *mxf = s->priv_data;
961
    KLVPacket klv;
962

    
963
    if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {
964
        av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
965
        return -1;
966
    }
967
    url_fseek(s->pb, -14, SEEK_CUR);
968
    mxf->fc = s;
969
    while (!url_feof(s->pb)) {
970
        const MXFMetadataReadTableEntry *metadata;
971

    
972
        if (klv_read_packet(&klv, s->pb) < 0)
973
            return -1;
974
#ifdef DEBUG
975
        PRINT_KEY(s, "read header", klv.key);
976
#endif
977
        if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
978
            IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
979
            /* FIXME avoid seek */
980
            url_fseek(s->pb, klv.offset, SEEK_SET);
981
            break;
982
        }
983

    
984
        for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
985
            if (IS_KLV_KEY(klv.key, metadata->key)) {
986
                int (*read)() = klv.key[5] == 0x53 ? mxf_read_local_tags : metadata->read;
987
                if (read(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type) < 0) {
988
                    av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
989
                    return -1;
990
                }
991
                break;
992
            }
993
        }
994
        if (!metadata->read)
995
            url_fskip(s->pb, klv.length);
996
    }
997
    return mxf_parse_structural_metadata(mxf);
998
}
999

    
1000
static int mxf_read_close(AVFormatContext *s)
1001
{
1002
    MXFContext *mxf = s->priv_data;
1003
    int i;
1004

    
1005
    av_freep(&mxf->packages_refs);
1006
    for (i = 0; i < mxf->metadata_sets_count; i++) {
1007
        switch (mxf->metadata_sets[i]->type) {
1008
        case MultipleDescriptor:
1009
            av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
1010
            break;
1011
        case Sequence:
1012
            av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
1013
            break;
1014
        case SourcePackage:
1015
        case MaterialPackage:
1016
            av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
1017
            break;
1018
        case Track:
1019
            mxf->metadata_sets[i] = NULL; /* will be freed later */
1020
            break;
1021
        default:
1022
            break;
1023
        }
1024
        av_freep(&mxf->metadata_sets[i]);
1025
    }
1026
    av_freep(&mxf->metadata_sets);
1027
    av_freep(&mxf->aesc);
1028
    av_freep(&mxf->local_tags);
1029
    return 0;
1030
}
1031

    
1032
static int mxf_probe(AVProbeData *p) {
1033
    uint8_t *bufp = p->buf;
1034
    uint8_t *end = p->buf + p->buf_size;
1035

    
1036
    if (p->buf_size < sizeof(mxf_header_partition_pack_key))
1037
        return 0;
1038

    
1039
    /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
1040
    end -= sizeof(mxf_header_partition_pack_key);
1041
    for (; bufp < end; bufp++) {
1042
        if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
1043
            return AVPROBE_SCORE_MAX;
1044
    }
1045
    return 0;
1046
}
1047

    
1048
/* rudimentary byte seek */
1049
/* XXX: use MXF Index */
1050
static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
1051
{
1052
    AVStream *st = s->streams[stream_index];
1053
    int64_t seconds;
1054

    
1055
    if (!s->bit_rate)
1056
        return -1;
1057
    if (sample_time < 0)
1058
        sample_time = 0;
1059
    seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
1060
    url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
1061
    av_update_cur_dts(s, st, sample_time);
1062
    return 0;
1063
}
1064

    
1065
AVInputFormat mxf_demuxer = {
1066
    "mxf",
1067
    NULL_IF_CONFIG_SMALL("Material eXchange Format"),
1068
    sizeof(MXFContext),
1069
    mxf_probe,
1070
    mxf_read_header,
1071
    mxf_read_packet,
1072
    mxf_read_close,
1073
    mxf_read_seek,
1074
};