libavformat/mxfdec.c

   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  *
  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 /*
  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.
  38  *
  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 #include "mxf.h"
  52
  53 typedef struct {
  54     UID uid;
  55     enum MXFMetadataSetType type;
  56     UID source_container_ul;
  57 } MXFCryptoContext;
  58
  59 typedef struct {
  60     UID uid;
  61     enum MXFMetadataSetType type;
  62     UID source_package_uid;
  63     UID data_definition_ul;
  64     int64_t duration;
  65     int64_t start_position;
  66     int source_track_id;
  67 } MXFStructuralComponent;
  68
  69 typedef struct {
  70     UID uid;
  71     enum MXFMetadataSetType type;
  72     UID data_definition_ul;
  73     UID *structural_components_refs;
  74     int structural_components_count;
  75     int64_t duration;
  76 } MXFSequence;
  77
  78 typedef struct {
  79     UID uid;
  80     enum MXFMetadataSetType type;
  81     MXFSequence *sequence; /* mandatory, and only one */
  82     UID sequence_ref;
  83     int track_id;
  84     uint8_t track_number[4];
  85     AVRational edit_rate;
  86 } MXFTrack;
  87
  88 typedef struct {
  89     UID uid;
  90     enum MXFMetadataSetType type;
  91     UID essence_container_ul;
  92     UID essence_codec_ul;
  93     AVRational sample_rate;
  94     AVRational aspect_ratio;
  95     int width;
  96     int height;
  97     int channels;
  98     int bits_per_sample;
  99     UID *sub_descriptors_refs;
 100     int sub_descriptors_count;
 101     int linked_track_id;
 102     uint8_t *extradata;
 103     int extradata_size;
 104 } MXFDescriptor;
 105
 106 typedef struct {
 107     UID uid;
 108     enum MXFMetadataSetType type;
 109 } MXFIndexTableSegment;
 110
 111 typedef struct {
 112     UID uid;
 113     enum MXFMetadataSetType type;
 114     UID package_uid;
 115     UID *tracks_refs;
 116     int tracks_count;
 117     MXFDescriptor *descriptor; /* only one */
 118     UID descriptor_ref;
 119 } MXFPackage;
 120
 121 typedef struct {
 122     UID uid;
 123     enum MXFMetadataSetType type;
 124 } MXFMetadataSet;
 125
 126 typedef struct {
 127     UID *packages_refs;
 128     int packages_count;
 129     MXFMetadataSet **metadata_sets;
 130     int metadata_sets_count;
 131     AVFormatContext *fc;
 132     struct AVAES *aesc;
 133     uint8_t *local_tags;
 134     int local_tags_count;
 135 } MXFContext;
 136
 137 enum MXFWrappingScheme {
 138     Frame,
 139     Clip,
 140 };
 141
 142 typedef struct {
 143     const UID key;
 144     int (*read)();
 145     int ctx_size;
 146     enum MXFMetadataSetType type;
 147 } MXFMetadataReadTableEntry;
 148
 149 /* partial keys to match */
 150 static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
 151 static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
 152 static const uint8_t mxf_klv_key[]                         = { 0x06,0x0e,0x2b,0x34 };
 153 /* complete keys to match */
 154 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 };
 155 static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
 156 static const uint8_t mxf_encrypted_essence_container[]     = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };
 157 static const uint8_t mxf_sony_mpeg4_extradata[]            = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };
 158
 159 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
 160
 161 static int64_t klv_decode_ber_length(ByteIOContext *pb)
 162 {
 163     uint64_t size = get_byte(pb);
 164     if (size & 0x80) { /* long form */
 165         int bytes_num = size & 0x7f;
 166         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
 167         if (bytes_num > 8)
 168             return -1;
 169         size = 0;
 170         while (bytes_num--)
 171             size = size << 8 | get_byte(pb);
 172     }
 173     return size;
 174 }
 175
 176 static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
 177 {
 178     int i, b;
 179     for (i = 0; i < size && !url_feof(pb); i++) {
 180         b = get_byte(pb);
 181         if (b == key[0])
 182             i = 0;
 183         else if (b != key[i])
 184             i = -1;
 185     }
 186     return i == size;
 187 }
 188
 189 static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
 190 {
 191     if (!mxf_read_sync(pb, mxf_klv_key, 4))
 192         return -1;
 193     klv->offset = url_ftell(pb) - 4;
 194     memcpy(klv->key, mxf_klv_key, 4);
 195     get_buffer(pb, klv->key + 4, 12);
 196     klv->length = klv_decode_ber_length(pb);
 197     return klv->length == -1 ? -1 : 0;
 198 }
 199
 200 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
 201 {
 202     int i;
 203
 204     for (i = 0; i < s->nb_streams; i++) {
 205         MXFTrack *track = s->streams[i]->priv_data;
 206         /* SMPTE 379M 7.3 */
 207         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
 208             return i;
 209     }
 210     /* return 0 if only one stream, for OP Atom files with 0 as track number */
 211     return s->nb_streams == 1 ? 0 : -1;
 212 }
 213
 214 /* XXX: use AVBitStreamFilter */
 215 static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
 216 {
 217     uint8_t buffer[61444];
 218     const uint8_t *buf_ptr, *end_ptr;
 219     uint8_t *data_ptr;
 220     int i;
 221
 222     if (length > 61444) /* worst case PAL 1920 samples 8 channels */
 223         return -1;
 224     get_buffer(pb, buffer, length);
 225     av_new_packet(pkt, length);
 226     data_ptr = pkt->data;
 227     end_ptr = buffer + length;
 228     buf_ptr = buffer + 4; /* skip SMPTE 331M header */
 229     for (; buf_ptr < end_ptr; ) {
 230         for (i = 0; i < st->codec->channels; i++) {
 231             uint32_t sample = bytestream_get_le32(&buf_ptr);
 232             if (st->codec->bits_per_coded_sample == 24)
 233                 bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);
 234             else
 235                 bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);
 236         }
 237         buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M
 238     }
 239     pkt->size = data_ptr - pkt->data;
 240     return 0;
 241 }
 242
 243 static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)
 244 {
 245     static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};
 246     MXFContext *mxf = s->priv_data;
 247     ByteIOContext *pb = s->pb;
 248     int64_t end = url_ftell(pb) + klv->length;
 249     uint64_t size;
 250     uint64_t orig_size;
 251     uint64_t plaintext_size;
 252     uint8_t ivec[16];
 253     uint8_t tmpbuf[16];
 254     int index;
 255
 256     if (!mxf->aesc && s->key && s->keylen == 16) {
 257         mxf->aesc = av_malloc(av_aes_size);
 258         if (!mxf->aesc)
 259             return -1;
 260         av_aes_init(mxf->aesc, s->key, 128, 1);
 261     }
 262     // crypto context
 263     url_fskip(pb, klv_decode_ber_length(pb));
 264     // plaintext offset
 265     klv_decode_ber_length(pb);
 266     plaintext_size = get_be64(pb);
 267     // source klv key
 268     klv_decode_ber_length(pb);
 269     get_buffer(pb, klv->key, 16);
 270     if (!IS_KLV_KEY(klv, mxf_essence_element_key))
 271         return -1;
 272     index = mxf_get_stream_index(s, klv);
 273     if (index < 0)
 274         return -1;
 275     // source size
 276     klv_decode_ber_length(pb);
 277     orig_size = get_be64(pb);
 278     if (orig_size < plaintext_size)
 279         return -1;
 280     // enc. code
 281     size = klv_decode_ber_length(pb);
 282     if (size < 32 || size - 32 < orig_size)
 283         return -1;
 284     get_buffer(pb, ivec, 16);
 285     get_buffer(pb, tmpbuf, 16);
 286     if (mxf->aesc)
 287         av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);
 288     if (memcmp(tmpbuf, checkv, 16))
 289         av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");
 290     size -= 32;
 291     av_get_packet(pb, pkt, size);
 292     size -= plaintext_size;
 293     if (mxf->aesc)
 294         av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],
 295                      &pkt->data[plaintext_size], size >> 4, ivec, 1);
 296     pkt->size = orig_size;
 297     pkt->stream_index = index;
 298     url_fskip(pb, end - url_ftell(pb));
 299     return 0;
 300 }
 301
 302 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
 303 {
 304     KLVPacket klv;
 305
 306     while (!url_feof(s->pb)) {
 307         if (klv_read_packet(&klv, s->pb) < 0)
 308             return -1;
 309         PRINT_KEY(s, "read packet", klv.key);
 310         dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset);
 311         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
 312             int res = mxf_decrypt_triplet(s, pkt, &klv);
 313             if (res < 0) {
 314                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
 315                 return -1;
 316             }
 317             return 0;
 318         }
 319         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
 320             int index = mxf_get_stream_index(s, &klv);
 321             if (index < 0) {
 322                 av_log(s, AV_LOG_ERROR, "error getting stream index %d\n", AV_RB32(klv.key+12));
 323                 goto skip;
 324             }
 325             if (s->streams[index]->discard == AVDISCARD_ALL)
 326                 goto skip;
 327             /* check for 8 channels AES3 element */
 328             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
 329                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {
 330                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
 331                     return -1;
 332                 }
 333             } else
 334                 av_get_packet(s->pb, pkt, klv.length);
 335             pkt->stream_index = index;
 336             pkt->pos = klv.offset;
 337             return 0;
 338         } else
 339         skip:
 340             url_fskip(s->pb, klv.length);
 341     }
 342     return AVERROR(EIO);
 343 }
 344
 345 static int mxf_read_primer_pack(MXFContext *mxf)
 346 {
 347     ByteIOContext *pb = mxf->fc->pb;
 348     int item_num = get_be32(pb);
 349     int item_len = get_be32(pb);
 350
 351     if (item_len != 18) {
 352         av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n");
 353         return -1;
 354     }
 355     if (item_num > UINT_MAX / item_len)
 356         return -1;
 357     mxf->local_tags_count = item_num;
 358     mxf->local_tags = av_malloc(item_num*item_len);
 359     if (!mxf->local_tags)
 360         return -1;
 361     get_buffer(pb, mxf->local_tags, item_num*item_len);
 362     return 0;
 363 }
 364
 365 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
 366 {
 367     mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
 368     if (!mxf->metadata_sets)
 369         return -1;
 370     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
 371     mxf->metadata_sets_count++;
 372     return 0;
 373 }
 374
 375 static int mxf_read_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag, int size, UID uid)
 376 {
 377     if (size != 16)
 378         return -1;
 379     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))
 380         get_buffer(pb, cryptocontext->source_container_ul, 16);
 381     return 0;
 382 }
 383
 384 static int mxf_read_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)
 385 {
 386     switch (tag) {
 387     case 0x1901:
 388         mxf->packages_count = get_be32(pb);
 389         if (mxf->packages_count >= UINT_MAX / sizeof(UID))
 390             return -1;
 391         mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
 392         if (!mxf->packages_refs)
 393             return -1;
 394         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 395         get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
 396         break;
 397     }
 398     return 0;
 399 }
 400
 401 static int mxf_read_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)
 402 {
 403     switch(tag) {
 404     case 0x0202:
 405         source_clip->duration = get_be64(pb);
 406         break;
 407     case 0x1201:
 408         source_clip->start_position = get_be64(pb);
 409         break;
 410     case 0x1101:
 411         /* UMID, only get last 16 bytes */
 412         url_fskip(pb, 16);
 413         get_buffer(pb, source_clip->source_package_uid, 16);
 414         break;
 415     case 0x1102:
 416         source_clip->source_track_id = get_be32(pb);
 417         break;
 418     }
 419     return 0;
 420 }
 421
 422 static int mxf_read_material_package(MXFPackage *package, ByteIOContext *pb, int tag)
 423 {
 424     switch(tag) {
 425     case 0x4403:
 426         package->tracks_count = get_be32(pb);
 427         if (package->tracks_count >= UINT_MAX / sizeof(UID))
 428             return -1;
 429         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
 430         if (!package->tracks_refs)
 431             return -1;
 432         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 433         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
 434         break;
 435     }
 436     return 0;
 437 }
 438
 439 static int mxf_read_track(MXFTrack *track, ByteIOContext *pb, int tag)
 440 {
 441     switch(tag) {
 442     case 0x4801:
 443         track->track_id = get_be32(pb);
 444         break;
 445     case 0x4804:
 446         get_buffer(pb, track->track_number, 4);
 447         break;
 448     case 0x4B01:
 449         track->edit_rate.den = get_be32(pb);
 450         track->edit_rate.num = get_be32(pb);
 451         break;
 452     case 0x4803:
 453         get_buffer(pb, track->sequence_ref, 16);
 454         break;
 455     }
 456     return 0;
 457 }
 458
 459 static int mxf_read_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)
 460 {
 461     switch(tag) {
 462     case 0x0202:
 463         sequence->duration = get_be64(pb);
 464         break;
 465     case 0x0201:
 466         get_buffer(pb, sequence->data_definition_ul, 16);
 467         break;
 468     case 0x1001:
 469         sequence->structural_components_count = get_be32(pb);
 470         if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
 471             return -1;
 472         sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
 473         if (!sequence->structural_components_refs)
 474             return -1;
 475         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 476         get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
 477         break;
 478     }
 479     return 0;
 480 }
 481
 482 static int mxf_read_source_package(MXFPackage *package, ByteIOContext *pb, int tag)
 483 {
 484     switch(tag) {
 485     case 0x4403:
 486         package->tracks_count = get_be32(pb);
 487         if (package->tracks_count >= UINT_MAX / sizeof(UID))
 488             return -1;
 489         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
 490         if (!package->tracks_refs)
 491             return -1;
 492         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 493         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
 494         break;
 495     case 0x4401:
 496         /* UMID, only get last 16 bytes */
 497         url_fskip(pb, 16);
 498         get_buffer(pb, package->package_uid, 16);
 499         break;
 500     case 0x4701:
 501         get_buffer(pb, package->descriptor_ref, 16);
 502         break;
 503     }
 504     return 0;
 505 }
 506
 507 static int mxf_read_index_table_segment(MXFIndexTableSegment *segment, ByteIOContext *pb, int tag)
 508 {
 509     switch(tag) {
 510     case 0x3F05: dprintf(NULL, "EditUnitByteCount %d\n", get_be32(pb)); break;
 511     case 0x3F06: dprintf(NULL, "IndexSID %d\n", get_be32(pb)); break;
 512     case 0x3F07: dprintf(NULL, "BodySID %d\n", get_be32(pb)); break;
 513     case 0x3F0B: dprintf(NULL, "IndexEditRate %d/%d\n", get_be32(pb), get_be32(pb)); break;
 514     case 0x3F0C: dprintf(NULL, "IndexStartPosition %lld\n", get_be64(pb)); break;
 515     case 0x3F0D: dprintf(NULL, "IndexDuration %lld\n", get_be64(pb)); break;
 516     }
 517     return 0;
 518 }
 519
 520 static void mxf_read_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
 521 {
 522     int code;
 523
 524     do {
 525         code = get_byte(pb);
 526         dprintf(NULL, "pixel layout: code %#x\n", code);
 527         switch (code) {
 528         case 0x52: /* R */
 529             descriptor->bits_per_sample += get_byte(pb);
 530             break;
 531         case 0x47: /* G */
 532             descriptor->bits_per_sample += get_byte(pb);
 533             break;
 534         case 0x42: /* B */
 535             descriptor->bits_per_sample += get_byte(pb);
 536             break;
 537         default:
 538             get_byte(pb);
 539         }
 540     } while (code != 0); /* SMPTE 377M E.2.46 */
 541 }
 542
 543 static int mxf_read_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size, UID uid)
 544 {
 545     switch(tag) {
 546     case 0x3F01:
 547         descriptor->sub_descriptors_count = get_be32(pb);
 548         if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
 549             return -1;
 550         descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
 551         if (!descriptor->sub_descriptors_refs)
 552             return -1;
 553         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 554         get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
 555         break;
 556     case 0x3004:
 557         get_buffer(pb, descriptor->essence_container_ul, 16);
 558         break;
 559     case 0x3006:
 560         descriptor->linked_track_id = get_be32(pb);
 561         break;
 562     case 0x3201: /* PictureEssenceCoding */
 563         get_buffer(pb, descriptor->essence_codec_ul, 16);
 564         break;
 565     case 0x3203:
 566         descriptor->width = get_be32(pb);
 567         break;
 568     case 0x3202:
 569         descriptor->height = get_be32(pb);
 570         break;
 571     case 0x320E:
 572         descriptor->aspect_ratio.num = get_be32(pb);
 573         descriptor->aspect_ratio.den = get_be32(pb);
 574         break;
 575     case 0x3D03:
 576         descriptor->sample_rate.num = get_be32(pb);
 577         descriptor->sample_rate.den = get_be32(pb);
 578         break;
 579     case 0x3D06: /* SoundEssenceCompression */
 580         get_buffer(pb, descriptor->essence_codec_ul, 16);
 581         break;
 582     case 0x3D07:
 583         descriptor->channels = get_be32(pb);
 584         break;
 585     case 0x3D01:
 586         descriptor->bits_per_sample = get_be32(pb);
 587         break;
 588     case 0x3401:
 589         mxf_read_pixel_layout(pb, descriptor);
 590         break;
 591     default:
 592         /* Private uid used by SONY C0023S01.mxf */
 593         if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {
 594             descriptor->extradata = av_malloc(size);
 595             if (!descriptor->extradata)
 596                 return -1;
 597             descriptor->extradata_size = size;
 598             get_buffer(pb, descriptor->extradata, size);
 599         }
 600         break;
 601     }
 602     return 0;
 603 }
 604
 605 /*
 606  * Match an uid independently of the version byte and up to len common bytes
 607  * Returns: boolean
 608  */
 609 static int mxf_match_uid(const UID key, const UID uid, int len)
 610 {
 611     int i;
 612     for (i = 0; i < len; i++) {
 613         if (i != 7 && key[i] != uid[i])
 614             return 0;
 615     }
 616     return 1;
 617 }
 618
 619 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
 620 {
 621     while (uls->uid[0]) {
 622         if(mxf_match_uid(uls->uid, *uid, uls->matching_len))
 623             break;
 624         uls++;
 625     }
 626     return uls;
 627 }
 628
 629 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
 630 {
 631     int i;
 632
 633     if (!strong_ref)
 634         return NULL;
 635     for (i = 0; i < mxf->metadata_sets_count; i++) {
 636         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
 637             (type == AnyType || mxf->metadata_sets[i]->type == type)) {
 638             return mxf->metadata_sets[i];
 639         }
 640     }
 641     return NULL;
 642 }
 643
 644 static const MXFCodecUL mxf_essence_container_uls[] = {
 645     // video essence container uls
 646     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */
 647     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */
 648     // sound essence container uls
 649     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */
 650     { { 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 */
 651     { { 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 */
 652     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },
 653 };
 654
 655 static int mxf_parse_structural_metadata(MXFContext *mxf)
 656 {
 657     MXFPackage *material_package = NULL;
 658     MXFPackage *temp_package = NULL;
 659     int i, j, k;
 660
 661     dprintf(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);
 662     /* TODO: handle multiple material packages (OP3x) */
 663     for (i = 0; i < mxf->packages_count; i++) {
 664         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
 665         if (material_package) break;
 666     }
 667     if (!material_package) {
 668         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
 669         return -1;
 670     }
 671
 672     for (i = 0; i < material_package->tracks_count; i++) {
 673         MXFPackage *source_package = NULL;
 674         MXFTrack *material_track = NULL;
 675         MXFTrack *source_track = NULL;
 676         MXFTrack *temp_track = NULL;
 677         MXFDescriptor *descriptor = NULL;
 678         MXFStructuralComponent *component = NULL;
 679         UID *essence_container_ul = NULL;
 680         const MXFCodecUL *codec_ul = NULL;
 681         const MXFCodecUL *container_ul = NULL;
 682         AVStream *st;
 683
 684         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
 685             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
 686             continue;
 687         }
 688
 689         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
 690             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
 691             return -1;
 692         }
 693
 694         /* TODO: handle multiple source clips */
 695         for (j = 0; j < material_track->sequence->structural_components_count; j++) {
 696             /* TODO: handle timecode component */
 697             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
 698             if (!component)
 699                 continue;
 700
 701             for (k = 0; k < mxf->packages_count; k++) {
 702                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
 703                 if (!temp_package)
 704                     continue;
 705                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
 706                     source_package = temp_package;
 707                     break;
 708                 }
 709             }
 710             if (!source_package) {
 711                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
 712                 break;
 713             }
 714             for (k = 0; k < source_package->tracks_count; k++) {
 715                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
 716                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
 717                     return -1;
 718                 }
 719                 if (temp_track->track_id == component->source_track_id) {
 720                     source_track = temp_track;
 721                     break;
 722                 }
 723             }
 724             if (!source_track) {
 725                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
 726                 break;
 727             }
 728         }
 729         if (!source_track)
 730             continue;
 731
 732         st = av_new_stream(mxf->fc, source_track->track_id);
 733         if (!st) {
 734             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
 735             return -1;
 736         }
 737         st->priv_data = source_track;
 738         st->duration = component->duration;
 739         if (st->duration == -1)
 740             st->duration = AV_NOPTS_VALUE;
 741         st->start_time = component->start_position;
 742         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
 743
 744         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
 745             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
 746             return -1;
 747         }
 748
 749         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);
 750         codec_ul = mxf_get_codec_ul(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
 751         st->codec->codec_type = codec_ul->id;
 752
 753         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
 754         if (source_package->descriptor) {
 755             if (source_package->descriptor->type == MultipleDescriptor) {
 756                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
 757                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
 758
 759                     if (!sub_descriptor) {
 760                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
 761                         continue;
 762                     }
 763                     if (sub_descriptor->linked_track_id == source_track->track_id) {
 764                         descriptor = sub_descriptor;
 765                         break;
 766                     }
 767                 }
 768             } else if (source_package->descriptor->type == Descriptor)
 769                 descriptor = source_package->descriptor;
 770         }
 771         if (!descriptor) {
 772             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
 773             continue;
 774         }
 775         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);
 776         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);
 777         essence_container_ul = &descriptor->essence_container_ul;
 778         /* HACK: replacing the original key with mxf_encrypted_essence_container
 779          * is not allowed according to s429-6, try to find correct information anyway */
 780         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {
 781             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");
 782             for (k = 0; k < mxf->metadata_sets_count; k++) {
 783                 MXFMetadataSet *metadata = mxf->metadata_sets[k];
 784                 if (metadata->type == CryptoContext) {
 785                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;
 786                     break;
 787                 }
 788             }
 789         }
 790         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
 791         codec_ul = mxf_get_codec_ul(ff_mxf_codec_uls, &descriptor->essence_codec_ul);
 792         st->codec->codec_id = codec_ul->id;
 793         if (descriptor->extradata) {
 794             st->codec->extradata = descriptor->extradata;
 795             st->codec->extradata_size = descriptor->extradata_size;
 796         }
 797         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 798             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);
 799             if (st->codec->codec_id == CODEC_ID_NONE)
 800                 st->codec->codec_id = container_ul->id;
 801             st->codec->width = descriptor->width;
 802             st->codec->height = descriptor->height;
 803             st->codec->bits_per_coded_sample = descriptor->bits_per_sample; /* Uncompressed */
 804             st->need_parsing = AVSTREAM_PARSE_HEADERS;
 805         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 806             container_ul = mxf_get_codec_ul(mxf_essence_container_uls, essence_container_ul);
 807             if (st->codec->codec_id == CODEC_ID_NONE)
 808                 st->codec->codec_id = container_ul->id;
 809             st->codec->channels = descriptor->channels;
 810             st->codec->bits_per_coded_sample = descriptor->bits_per_sample;
 811             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
 812             /* TODO: implement CODEC_ID_RAWAUDIO */
 813             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
 814                 if (descriptor->bits_per_sample == 24)
 815                     st->codec->codec_id = CODEC_ID_PCM_S24LE;
 816                 else if (descriptor->bits_per_sample == 32)
 817                     st->codec->codec_id = CODEC_ID_PCM_S32LE;
 818             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
 819                 if (descriptor->bits_per_sample == 24)
 820                     st->codec->codec_id = CODEC_ID_PCM_S24BE;
 821                 else if (descriptor->bits_per_sample == 32)
 822                     st->codec->codec_id = CODEC_ID_PCM_S32BE;
 823             } else if (st->codec->codec_id == CODEC_ID_MP2) {
 824                 st->need_parsing = AVSTREAM_PARSE_FULL;
 825             }
 826         }
 827         if (st->codec->codec_type != CODEC_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {
 828             av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n");
 829             st->need_parsing = AVSTREAM_PARSE_FULL;
 830         }
 831     }
 832     return 0;
 833 }
 834
 835 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
 836     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },
 837     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },
 838     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },
 839     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },
 840     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },
 841     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },
 842     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
 843     { { 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 */
 844     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
 845     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
 846     { { 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 */
 847     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
 848     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
 849     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */
 850     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */
 851     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },
 852     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x10,0x01,0x00 }, mxf_read_index_table_segment, sizeof(MXFIndexTableSegment), IndexTableSegment },
 853     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
 854 };
 855
 856 static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type)
 857 {
 858     ByteIOContext *pb = mxf->fc->pb;
 859     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
 860     uint64_t klv_end = url_ftell(pb) + klv->length;
 861
 862     if (!ctx)
 863         return -1;
 864     while (url_ftell(pb) + 4 < klv_end) {
 865         int tag = get_be16(pb);
 866         int size = get_be16(pb); /* KLV specified by 0x53 */
 867         uint64_t next = url_ftell(pb) + size;
 868         UID uid = {0};
 869
 870         dprintf(mxf->fc, "local tag %#04x size %d\n", tag, size);
 871         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
 872             av_log(mxf->fc, AV_LOG_ERROR, "local tag %#04x with 0 size\n", tag);
 873             continue;
 874         }
 875         if (tag > 0x7FFF) { /* dynamic tag */
 876             int i;
 877             for (i = 0; i < mxf->local_tags_count; i++) {
 878                 int local_tag = AV_RB16(mxf->local_tags+i*18);
 879                 if (local_tag == tag) {
 880                     memcpy(uid, mxf->local_tags+i*18+2, 16);
 881                     dprintf(mxf->fc, "local tag %#04x\n", local_tag);
 882                     PRINT_KEY(mxf->fc, "uid", uid);
 883                 }
 884             }
 885         }
 886         if (ctx_size && tag == 0x3C0A)
 887             get_buffer(pb, ctx->uid, 16);
 888         else if (read_child(ctx, pb, tag, size, uid) < 0)
 889             return -1;
 890
 891         url_fseek(pb, next, SEEK_SET);
 892     }
 893     if (ctx_size) ctx->type = type;
 894     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
 895 }
 896
 897 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 898 {
 899     MXFContext *mxf = s->priv_data;
 900     KLVPacket klv;
 901
 902     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {
 903         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
 904         return -1;
 905     }
 906     url_fseek(s->pb, -14, SEEK_CUR);
 907     mxf->fc = s;
 908     while (!url_feof(s->pb)) {
 909         const MXFMetadataReadTableEntry *metadata;
 910
 911         if (klv_read_packet(&klv, s->pb) < 0)
 912             return -1;
 913         PRINT_KEY(s, "read header", klv.key);
 914         dprintf(s, "size %lld offset %#llx\n", klv.length, klv.offset);
 915         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
 916             IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
 917             /* FIXME avoid seek */
 918             url_fseek(s->pb, klv.offset, SEEK_SET);
 919             break;
 920         }
 921
 922         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
 923             if (IS_KLV_KEY(klv.key, metadata->key)) {
 924                 int (*read)() = klv.key[5] == 0x53 ? mxf_read_local_tags : metadata->read;
 925                 if (read(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type) < 0) {
 926                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
 927                     return -1;
 928                 }
 929                 break;
 930             }
 931         }
 932         if (!metadata->read)
 933             url_fskip(s->pb, klv.length);
 934     }
 935     return mxf_parse_structural_metadata(mxf);
 936 }
 937
 938 static int mxf_read_close(AVFormatContext *s)
 939 {
 940     MXFContext *mxf = s->priv_data;
 941     int i;
 942
 943     av_freep(&mxf->packages_refs);
 944     for (i = 0; i < mxf->metadata_sets_count; i++) {
 945         switch (mxf->metadata_sets[i]->type) {
 946         case MultipleDescriptor:
 947             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
 948             break;
 949         case Sequence:
 950             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
 951             break;
 952         case SourcePackage:
 953         case MaterialPackage:
 954             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
 955             break;
 956         case Track:
 957             mxf->metadata_sets[i] = NULL; /* will be freed later */
 958             break;
 959         default:
 960             break;
 961         }
 962         av_freep(&mxf->metadata_sets[i]);
 963     }
 964     av_freep(&mxf->metadata_sets);
 965     av_freep(&mxf->aesc);
 966     av_freep(&mxf->local_tags);
 967     return 0;
 968 }
 969
 970 static int mxf_probe(AVProbeData *p) {
 971     uint8_t *bufp = p->buf;
 972     uint8_t *end = p->buf + p->buf_size;
 973
 974     if (p->buf_size < sizeof(mxf_header_partition_pack_key))
 975         return 0;
 976
 977     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
 978     end -= sizeof(mxf_header_partition_pack_key);
 979     for (; bufp < end; bufp++) {
 980         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
 981             return AVPROBE_SCORE_MAX;
 982     }
 983     return 0;
 984 }
 985
 986 /* rudimentary byte seek */
 987 /* XXX: use MXF Index */
 988 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
 989 {
 990     AVStream *st = s->streams[stream_index];
 991     int64_t seconds;
 992
 993     if (!s->bit_rate)
 994         return -1;
 995     if (sample_time < 0)
 996         sample_time = 0;
 997     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
 998     url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
 999     av_update_cur_dts(s, st, sample_time);
1000     return 0;
1001 }
1002
1003 AVInputFormat mxf_demuxer = {
1004     "mxf",
1005     NULL_IF_CONFIG_SMALL("Material eXchange Format"),
1006     sizeof(MXFContext),
1007     mxf_probe,
1008     mxf_read_header,
1009     mxf_read_packet,
1010     mxf_read_close,
1011     mxf_read_seek,
1012 };