libavformat/mxf.c

   1 /*
   2  * MXF demuxer.
   3  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 /*
  21  * References
  22  * SMPTE 336M KLV Data Encoding Protocol Using Key-Length-Value
  23  * SMPTE 377M MXF File Format Specifications
  24  * SMPTE 378M Operational Pattern 1a
  25  * SMPTE 379M MXF Generic Container
  26  * SMPTE 381M Mapping MPEG Streams into the MXF Generic Container
  27  * SMPTE 382M Mapping AES3 and Broadcast Wave Audio into the MXF Generic Container
  28  * SMPTE 383M Mapping DV-DIF Data to the MXF Generic Container
  29  *
  30  * Principle
  31  * Search for Track numbers which will identify essence element KLV packets.
  32  * Search for SourcePackage which define tracks which contains Track numbers.
  33  * Material Package contains tracks with reference to SourcePackage tracks.
  34  * Search for Descriptors (Picture, Sound) which contains codec info and parameters.
  35  * Assign Descriptors to correct Tracks.
  36  *
  37  * Metadata reading functions read Local Tags, get InstanceUID(0x3C0A) then add MetaDataSet to MXFContext.
  38  * Metadata parsing resolves Strong References to objects.
  39  *
  40  * Simple demuxer, only OP1A supported and some files might not work at all.
  41  * Only tracks with associated descriptors will be decoded. "Highly Desirable" SMPTE 377M D.1
  42  */
  43
  44 //#define DEBUG
  45
  46 #include "avformat.h"
  47
  48 typedef uint8_t UID[16];
  49
  50 enum MXFMetadataSetType {
  51     MaterialPackage,
  52     SourcePackage,
  53     SourceClip,
  54     TimecodeComponent,
  55     Sequence,
  56     MultipleDescriptor,
  57     Descriptor,
  58     Track,
  59     EssenceContainerData,
  60 };
  61
  62 typedef struct MXFStructuralComponent {
  63     UID uid;
  64     enum MXFMetadataSetType type;
  65     UID source_package_uid;
  66     UID data_definition_ul;
  67     int64_t duration;
  68     int64_t start_position;
  69     int source_track_id;
  70 } MXFStructuralComponent;
  71
  72 typedef struct MXFSequence {
  73     UID uid;
  74     enum MXFMetadataSetType type;
  75     UID data_definition_ul;
  76     UID *structural_components_refs;
  77     int structural_components_count;
  78     int64_t duration;
  79 } MXFSequence;
  80
  81 typedef struct MXFTrack {
  82     UID uid;
  83     enum MXFMetadataSetType type;
  84     MXFSequence *sequence; /* mandatory, and only one */
  85     UID sequence_ref;
  86     int track_id;
  87     uint8_t track_number[4];
  88     AVRational edit_rate;
  89 } MXFTrack;
  90
  91 typedef struct MXFDescriptor {
  92     UID uid;
  93     enum MXFMetadataSetType type;
  94     UID essence_container_ul;
  95     UID essence_codec_ul;
  96     AVRational sample_rate;
  97     AVRational aspect_ratio;
  98     int width;
  99     int height;
 100     int channels;
 101     int bits_per_sample;
 102     UID *sub_descriptors_refs;
 103     int sub_descriptors_count;
 104     int linked_track_id;
 105     uint8_t *extradata;
 106     int extradata_size;
 107 } MXFDescriptor;
 108
 109 typedef struct MXFPackage {
 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 MXFEssenceContainerData {
 120     UID uid;
 121     enum MXFMetadataSetType type;
 122     UID linked_package_uid;
 123 } MXFEssenceContainerData;
 124
 125 typedef struct {
 126     UID uid;
 127     enum MXFMetadataSetType type;
 128 } MXFMetadataSet;
 129
 130 typedef struct MXFContext {
 131     UID *packages_refs;
 132     int packages_count;
 133     UID *essence_container_data_sets_refs;
 134     int essence_container_data_sets_count;
 135     UID *essence_containers_uls; /* Universal Labels SMPTE RP224 */
 136     int essence_containers_uls_count;
 137     UID operational_pattern_ul;
 138     UID content_storage_uid;
 139     MXFMetadataSet **metadata_sets;
 140     int metadata_sets_count;
 141     AVFormatContext *fc;
 142 } MXFContext;
 143
 144 typedef struct KLVPacket {
 145     UID key;
 146     offset_t offset;
 147     uint64_t length;
 148 } KLVPacket;
 149
 150 enum MXFWrappingScheme {
 151     Frame,
 152     Clip,
 153 };
 154
 155 typedef struct MXFCodecUL {
 156     UID uid;
 157     enum CodecID id;
 158     enum MXFWrappingScheme wrapping;
 159 } MXFCodecUL;
 160
 161 typedef struct MXFDataDefinitionUL {
 162     UID uid;
 163     enum CodecType type;
 164 } MXFDataDefinitionUL;
 165
 166 typedef struct MXFMetadataReadTableEntry {
 167     const UID key;
 168     int (*read)(MXFContext *mxf, KLVPacket *klv);
 169 } MXFMetadataReadTableEntry;
 170
 171 /* partial keys to match */
 172 static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
 173 static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
 174
 175 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
 176
 177 #define PRINT_KEY(s, x) dprintf("%s %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n", s, \
 178                              (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])
 179
 180 static int64_t klv_decode_ber_length(ByteIOContext *pb)
 181 {
 182     int64_t size = 0;
 183     uint8_t length = get_byte(pb);
 184     int type = length >> 7;
 185
 186     if (type) { /* long form */
 187         int bytes_num = length & 0x7f;
 188         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
 189         if (bytes_num > 8)
 190             return -1;
 191         while (bytes_num--)
 192             size = size << 8 | get_byte(pb);
 193     } else {
 194         size = length & 0x7f;
 195     }
 196     return size;
 197 }
 198
 199 static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
 200 {
 201     klv->offset = url_ftell(pb);
 202     get_buffer(pb, klv->key, 16);
 203     klv->length = klv_decode_ber_length(pb);
 204     return klv->length == -1 ? -1 : 0;
 205 }
 206
 207 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
 208 {
 209     int i;
 210
 211     for (i = 0; i < s->nb_streams; i++) {
 212         MXFTrack *track = s->streams[i]->priv_data;
 213          /* SMPTE 379M 7.3 */
 214         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
 215             return i;
 216     }
 217     /* return 0 if only one stream, for OP Atom files with 0 as track number */
 218     return s->nb_streams == 1 ? 0 : -1;
 219 }
 220
 221 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
 222 {
 223     KLVPacket klv;
 224
 225     while (!url_feof(&s->pb)) {
 226         if (klv_read_packet(&klv, &s->pb) < 0) {
 227             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
 228             return -1;
 229         }
 230 #ifdef DEBUG
 231         PRINT_KEY("read packet", klv.key);
 232 #endif
 233         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
 234             av_get_packet(&s->pb, pkt, klv.length);
 235             pkt->stream_index = mxf_get_stream_index(s, &klv);
 236             return pkt->stream_index == -1 ? -1 : 0;
 237         } else
 238             url_fskip(&s->pb, klv.length);
 239     }
 240     return AVERROR_IO;
 241 }
 242
 243 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
 244 {
 245     mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
 246     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
 247     mxf->metadata_sets_count++;
 248     return 0;
 249 }
 250
 251 static int mxf_read_metadata_preface(MXFContext *mxf, KLVPacket *klv)
 252 {
 253     ByteIOContext *pb = &mxf->fc->pb;
 254     int bytes_read = 0;
 255
 256     while (bytes_read < klv->length) {
 257         int tag = get_be16(pb);
 258         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */
 259
 260         switch (tag) {
 261         case 0x3B03:
 262             get_buffer(pb, mxf->content_storage_uid, 16);
 263             break;
 264         case 0x3B09:
 265             get_buffer(pb, mxf->operational_pattern_ul, 16);
 266             break;
 267         case 0x3B0A:
 268             mxf->essence_containers_uls_count = get_be32(pb);
 269             if (mxf->essence_containers_uls_count >= UINT_MAX / sizeof(UID))
 270                 return -1;
 271             mxf->essence_containers_uls = av_malloc(mxf->essence_containers_uls_count * sizeof(UID));
 272             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 273             get_buffer(pb, (uint8_t *)mxf->essence_containers_uls, mxf->essence_containers_uls_count * sizeof(UID));
 274             break;
 275         default:
 276             url_fskip(pb, size);
 277         }
 278         bytes_read += size + 4;
 279     }
 280     return 0;
 281 }
 282
 283 static int mxf_read_metadata_content_storage(MXFContext *mxf, KLVPacket *klv)
 284 {
 285     ByteIOContext *pb = &mxf->fc->pb;
 286     int bytes_read = 0;
 287
 288     while (bytes_read < klv->length) {
 289         int tag = get_be16(pb);
 290         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */
 291
 292         dprintf("tag 0x%04X, size %d\n", tag, size);
 293         switch (tag) {
 294         case 0x1901:
 295             mxf->packages_count = get_be32(pb);
 296             if (mxf->packages_count >= UINT_MAX / sizeof(UID))
 297                 return -1;
 298             mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
 299             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 300             get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
 301             break;
 302         case 0x1902:
 303             mxf->essence_container_data_sets_count = get_be32(pb);
 304             if (mxf->essence_container_data_sets_count >= UINT_MAX / sizeof(UID))
 305                 return -1;
 306             mxf->essence_container_data_sets_refs = av_malloc(mxf->essence_container_data_sets_count * sizeof(UID));
 307             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 308             get_buffer(pb, (uint8_t *)mxf->essence_container_data_sets_refs, mxf->essence_container_data_sets_count * sizeof(UID));
 309             break;
 310         default:
 311             url_fskip(pb, size);
 312         }
 313         bytes_read += size + 4;
 314     }
 315     return 0;
 316 }
 317
 318 static int mxf_read_metadata_source_clip(MXFContext *mxf, KLVPacket *klv)
 319 {
 320     ByteIOContext *pb = &mxf->fc->pb;
 321     MXFStructuralComponent *source_clip = av_mallocz(sizeof(*source_clip));
 322     int bytes_read = 0;
 323
 324     while (bytes_read < klv->length) {
 325         int tag = get_be16(pb);
 326         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */
 327
 328         bytes_read += size + 4;
 329         dprintf("tag 0x%04X, size %d\n", tag, size);
 330         if (!size) /* ignore empty tag, needed for some files with empty UMID tag */
 331             continue;
 332         switch (tag) {
 333         case 0x3C0A:
 334             get_buffer(pb, source_clip->uid, 16);
 335             break;
 336         case 0x0202:
 337             source_clip->duration = get_be64(pb);
 338             break;
 339         case 0x1201:
 340             source_clip->start_position = get_be64(pb);
 341             break;
 342         case 0x1101:
 343             /* UMID, only get last 16 bytes */
 344             url_fskip(pb, 16);
 345             get_buffer(pb, source_clip->source_package_uid, 16);
 346             break;
 347         case 0x1102:
 348             source_clip->source_track_id = get_be32(pb);
 349             break;
 350         default:
 351             url_fskip(pb, size);
 352         }
 353     }
 354     source_clip->type = SourceClip;
 355     return mxf_add_metadata_set(mxf, source_clip);
 356 }
 357
 358 static int mxf_read_metadata_material_package(MXFContext *mxf, KLVPacket *klv)
 359 {
 360     ByteIOContext *pb = &mxf->fc->pb;
 361     MXFPackage *package = av_mallocz(sizeof(*package));
 362     int bytes_read = 0;
 363
 364     while (bytes_read < klv->length) {
 365         int tag = get_be16(pb);
 366         int size = get_be16(pb); /* KLV specified by 0x53 */
 367
 368         switch (tag) {
 369         case 0x3C0A:
 370             get_buffer(pb, package->uid, 16);
 371             break;
 372         case 0x4403:
 373             package->tracks_count = get_be32(pb);
 374             if (package->tracks_count >= UINT_MAX / sizeof(UID))
 375                 return -1;
 376             package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
 377             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 378             get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
 379             break;
 380         default:
 381             url_fskip(pb, size);
 382         }
 383         bytes_read += size + 4;
 384     }
 385     package->type = MaterialPackage;
 386     return mxf_add_metadata_set(mxf, package);
 387 }
 388
 389 static int mxf_read_metadata_track(MXFContext *mxf, KLVPacket *klv)
 390 {
 391     ByteIOContext *pb = &mxf->fc->pb;
 392     MXFTrack *track = av_mallocz(sizeof(*track));
 393     int bytes_read = 0;
 394
 395     while (bytes_read < klv->length) {
 396         int tag = get_be16(pb);
 397         int size = get_be16(pb); /* KLV specified by 0x53 */
 398
 399         dprintf("tag 0x%04X, size %d\n", tag, size);
 400         switch (tag) {
 401         case 0x3C0A:
 402             get_buffer(pb, track->uid, 16);
 403             break;
 404         case 0x4801:
 405             track->track_id = get_be32(pb);
 406             break;
 407         case 0x4804:
 408             get_buffer(pb, track->track_number, 4);
 409             break;
 410         case 0x4B01:
 411             track->edit_rate.den = get_be32(pb);
 412             track->edit_rate.num = get_be32(pb);
 413             break;
 414         case 0x4803:
 415             get_buffer(pb, track->sequence_ref, 16);
 416             break;
 417         default:
 418             url_fskip(pb, size);
 419         }
 420         bytes_read += size + 4;
 421     }
 422     track->type = Track;
 423     return mxf_add_metadata_set(mxf, track);
 424 }
 425
 426 static int mxf_read_metadata_sequence(MXFContext *mxf, KLVPacket *klv)
 427 {
 428     ByteIOContext *pb = &mxf->fc->pb;
 429     MXFSequence *sequence = av_mallocz(sizeof(*sequence));
 430     int bytes_read = 0;
 431
 432     while (bytes_read < klv->length) {
 433         int tag = get_be16(pb);
 434         int size = get_be16(pb); /* KLV specified by 0x53 */
 435
 436         dprintf("tag 0x%04X, size %d\n", tag, size);
 437         switch (tag) {
 438         case 0x3C0A:
 439             get_buffer(pb, sequence->uid, 16);
 440             break;
 441         case 0x0202:
 442             sequence->duration = get_be64(pb);
 443             break;
 444         case 0x0201:
 445             get_buffer(pb, sequence->data_definition_ul, 16);
 446             break;
 447         case 0x1001:
 448             sequence->structural_components_count = get_be32(pb);
 449             if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
 450                 return -1;
 451             sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
 452             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 453             get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
 454             break;
 455         default:
 456             url_fskip(pb, size);
 457         }
 458         bytes_read += size + 4;
 459     }
 460     sequence->type = Sequence;
 461     return mxf_add_metadata_set(mxf, sequence);
 462 }
 463
 464 static int mxf_read_metadata_source_package(MXFContext *mxf, KLVPacket *klv)
 465 {
 466     ByteIOContext *pb = &mxf->fc->pb;
 467     MXFPackage *package = av_mallocz(sizeof(*package));
 468     int bytes_read = 0;
 469
 470     while (bytes_read < klv->length) {
 471         int tag = get_be16(pb);
 472         int size = get_be16(pb); /* KLV specified by 0x53 */
 473
 474         dprintf("tag 0x%04X, size %d\n", tag, size);
 475         switch (tag) {
 476         case 0x3C0A:
 477             get_buffer(pb, package->uid, 16);
 478             break;
 479         case 0x4403:
 480             package->tracks_count = get_be32(pb);
 481             if (package->tracks_count >= UINT_MAX / sizeof(UID))
 482                 return -1;
 483             package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
 484             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 485             get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
 486             break;
 487         case 0x4401:
 488             /* UMID, only get last 16 bytes */
 489             url_fskip(pb, 16);
 490             get_buffer(pb, package->package_uid, 16);
 491             break;
 492         case 0x4701:
 493             get_buffer(pb, package->descriptor_ref, 16);
 494             break;
 495         default:
 496             url_fskip(pb, size);
 497         }
 498         bytes_read += size + 4;
 499     }
 500     package->type = SourcePackage;
 501     return mxf_add_metadata_set(mxf, package);
 502 }
 503
 504 static int mxf_read_metadata_multiple_descriptor(MXFContext *mxf, KLVPacket *klv)
 505 {
 506     ByteIOContext *pb = &mxf->fc->pb;
 507     MXFDescriptor *descriptor = av_mallocz(sizeof(*descriptor));
 508     int bytes_read = 0;
 509
 510     while (bytes_read < klv->length) {
 511         int tag = get_be16(pb);
 512         int size = get_be16(pb); /* KLV specified by 0x53 */
 513
 514         dprintf("tag 0x%04X, size %d\n", tag, size);
 515         switch (tag) {
 516         case 0x3C0A:
 517             get_buffer(pb, descriptor->uid, 16);
 518             break;
 519         case 0x3F01:
 520             descriptor->sub_descriptors_count = get_be32(pb);
 521             if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
 522                 return -1;
 523             descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
 524             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 525             get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
 526             break;
 527         default:
 528             url_fskip(pb, size);
 529         }
 530         bytes_read += size + 4;
 531     }
 532     descriptor->type = MultipleDescriptor;
 533     return mxf_add_metadata_set(mxf, descriptor);
 534 }
 535
 536 static void mxf_read_metadata_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
 537 {
 538     int code;
 539
 540     do {
 541         code = get_byte(pb);
 542         dprintf("pixel layout: code 0x%x\n", code);
 543         switch (code) {
 544         case 0x52: /* R */
 545             descriptor->bits_per_sample += get_byte(pb);
 546             break;
 547         case 0x47: /* G */
 548             descriptor->bits_per_sample += get_byte(pb);
 549             break;
 550         case 0x42: /* B */
 551             descriptor->bits_per_sample += get_byte(pb);
 552             break;
 553         default:
 554             get_byte(pb);
 555         }
 556     } while (code != 0); /* SMPTE 377M E.2.46 */
 557 }
 558
 559 static int mxf_read_metadata_generic_descriptor(MXFContext *mxf, KLVPacket *klv)
 560 {
 561     ByteIOContext *pb = &mxf->fc->pb;
 562     MXFDescriptor *descriptor = av_mallocz(sizeof(*descriptor));
 563     int bytes_read = 0;
 564
 565     while (bytes_read < klv->length) {
 566         int tag = get_be16(pb);
 567         int size = get_be16(pb); /* KLV specified by 0x53 */
 568
 569         dprintf("tag 0x%04X, size %d\n", tag, size);
 570         switch (tag) {
 571         case 0x3C0A:
 572             get_buffer(pb, descriptor->uid, 16);
 573             break;
 574         case 0x3004:
 575             get_buffer(pb, descriptor->essence_container_ul, 16);
 576             break;
 577         case 0x3006:
 578             descriptor->linked_track_id = get_be32(pb);
 579             break;
 580         case 0x3201: /* PictureEssenceCoding */
 581             get_buffer(pb, descriptor->essence_codec_ul, 16);
 582             break;
 583         case 0x3203:
 584             descriptor->width = get_be32(pb);
 585             break;
 586         case 0x3202:
 587             descriptor->height = get_be32(pb);
 588             break;
 589         case 0x320E:
 590             descriptor->aspect_ratio.num = get_be32(pb);
 591             descriptor->aspect_ratio.den = get_be32(pb);
 592             break;
 593         case 0x3D03:
 594             descriptor->sample_rate.num = get_be32(pb);
 595             descriptor->sample_rate.den = get_be32(pb);
 596             break;
 597         case 0x3D06: /* SoundEssenceCompression */
 598             get_buffer(pb, descriptor->essence_codec_ul, 16);
 599             break;
 600         case 0x3D07:
 601             descriptor->channels = get_be32(pb);
 602             break;
 603         case 0x3D01:
 604             descriptor->bits_per_sample = get_be32(pb);
 605             break;
 606         case 0x3401:
 607             mxf_read_metadata_pixel_layout(pb, descriptor);
 608             break;
 609         case 0x8201: /* Private tag used by SONY C0023S01.mxf */
 610             descriptor->extradata = av_malloc(size);
 611             descriptor->extradata_size = size;
 612             get_buffer(pb, descriptor->extradata, size);
 613             break;
 614         default:
 615             url_fskip(pb, size);
 616         }
 617         bytes_read += size + 4;
 618     }
 619     descriptor->type = Descriptor;
 620     return mxf_add_metadata_set(mxf, descriptor);
 621 }
 622
 623 /* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */
 624 static const MXFDataDefinitionUL mxf_data_definition_uls[] = {
 625     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },
 626     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },
 627     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },
 628     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },
 629 };
 630
 631 static const MXFCodecUL mxf_codec_uls[] = {
 632     /* PictureEssenceCoding */
 633     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */
 634     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */
 635     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */
 636     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */
 637     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */
 638     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */
 639     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */
 640     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */
 641     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */
 642     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */
 643     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */
 644     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */
 645     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */
 646     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */
 647     /* SoundEssenceCompression */
 648     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */
 649     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },
 650     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x02,0x02,0x01,0x7E,0x00,0x00,0x00 },  CODEC_ID_PCM_S16BE, Frame }, /* From Omneon MXF file */
 651     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },
 652     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x04,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame }, /* XDCAM Proxy C0023S01.mxf */
 653     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },
 654     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */
 655   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */
 656     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
 657 };
 658
 659 static const MXFCodecUL mxf_picture_essence_container_uls[] = {
 660     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */
 661     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0xe0,0x02 }, CODEC_ID_MPEG2VIDEO,  Clip }, /* MPEG-ES Clip wrapped, 0xe0 MPV stream id */
 662     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x04,0x61,0x07 }, CODEC_ID_MPEG2VIDEO,  Clip }, /* MPEG-ES Custom wrapped, 0x61 ??? stream id */
 663     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
 664 };
 665
 666 static const MXFCodecUL mxf_sound_essence_container_uls[] = {
 667     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */
 668     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */
 669     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 },        CODEC_ID_MP2, Frame }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */
 670     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0xc0,0x01 },        CODEC_ID_MP2, Frame }, /* MPEG-ES Frame wrapped, 0xc0 MPA stream id */
 671     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0xc0,0x02 },        CODEC_ID_MP2,  Clip }, /* MPEG-ES Clip wrapped, 0xc0 MPA stream id */
 672   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x05,0x01 },   CODEC_ID_PCM_AES3, Frame }, /* D-10 Mapping 30Mbps PAL Extended Template */
 673     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
 674 };
 675
 676 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
 677 {
 678     while (uls->id != CODEC_ID_NONE) {
 679         if(!memcmp(uls->uid, *uid, 16))
 680             break;
 681         uls++;
 682     }
 683     return uls;
 684 }
 685
 686 static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)
 687 {
 688     while (uls->type != CODEC_TYPE_DATA) {
 689         if(!memcmp(uls->uid, *uid, 16))
 690             break;
 691         uls++;
 692     }
 693     return uls->type;
 694 }
 695
 696 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref)
 697 {
 698     int i;
 699
 700     if (!strong_ref)
 701         return NULL;
 702     for (i = 0; i < mxf->metadata_sets_count; i++) {
 703         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16)) {
 704             return mxf->metadata_sets[i];
 705         }
 706     }
 707     return NULL;
 708 }
 709
 710 static int mxf_parse_structural_metadata(MXFContext *mxf)
 711 {
 712     MXFPackage *material_package = NULL;
 713     MXFPackage *source_package = NULL;
 714     MXFPackage *temp_package = NULL;
 715     int i, j, k;
 716
 717     dprintf("metadata sets count %d\n", mxf->metadata_sets_count);
 718     /* TODO: handle multiple material packages (OP3x) */
 719     for (i = 0; i < mxf->packages_count; i++) {
 720         if (!(temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i]))) {
 721             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve package strong ref\n");
 722             return -1;
 723         }
 724         if (temp_package->type == MaterialPackage) {
 725             material_package = temp_package;
 726             break;
 727         }
 728     }
 729     if (!material_package) {
 730         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
 731         return -1;
 732     }
 733
 734     for (i = 0; i < material_package->tracks_count; i++) {
 735         MXFTrack *material_track = NULL;
 736         MXFTrack *source_track = NULL;
 737         MXFTrack *temp_track = NULL;
 738         MXFDescriptor *descriptor = NULL;
 739         MXFStructuralComponent *component = NULL;
 740         const MXFCodecUL *codec_ul = NULL;
 741         const MXFCodecUL *container_ul = NULL;
 742         AVStream *st;
 743
 744         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i]))) {
 745             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
 746             continue;
 747         }
 748
 749         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref))) {
 750             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
 751             return -1;
 752         }
 753
 754         /* TODO: handle multiple source clips */
 755         for (j = 0; j < material_track->sequence->structural_components_count; j++) {
 756             /* TODO: handle timecode component */
 757             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j]);
 758             if (!component || component->type != SourceClip)
 759                 continue;
 760
 761             for (k = 0; k < mxf->packages_count; k++) {
 762                 if (!(temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k]))) {
 763                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
 764                     return -1;
 765                 }
 766                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
 767                     source_package = temp_package;
 768                     break;
 769                 }
 770             }
 771             if (!source_package) {
 772                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
 773                 break;
 774             }
 775             for (k = 0; k < source_package->tracks_count; k++) {
 776                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k]))) {
 777                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
 778                     return -1;
 779                 }
 780                 if (temp_track->track_id == component->source_track_id) {
 781                     source_track = temp_track;
 782                     break;
 783                 }
 784             }
 785             if (!source_track) {
 786                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
 787                 break;
 788             }
 789         }
 790         if (!source_track)
 791             continue;
 792
 793         st = av_new_stream(mxf->fc, source_track->track_id);
 794         st->priv_data = source_track;
 795         st->duration = component->duration;
 796         if (st->duration == -1)
 797             st->duration = AV_NOPTS_VALUE;
 798         st->start_time = component->start_position;
 799         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
 800
 801         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref))) {
 802             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
 803             return -1;
 804         }
 805
 806 #ifdef DEBUG
 807         PRINT_KEY("data definition   ul", source_track->sequence->data_definition_ul);
 808 #endif
 809         st->codec->codec_type = mxf_get_codec_type(mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
 810
 811         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref);
 812         if (source_package->descriptor) {
 813             if (source_package->descriptor->type == MultipleDescriptor) {
 814                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
 815                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j]);
 816
 817                     if (!sub_descriptor) {
 818                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
 819                         continue;
 820                     }
 821                     if (sub_descriptor->linked_track_id == source_track->track_id) {
 822                         descriptor = sub_descriptor;
 823                         break;
 824                     }
 825                 }
 826             } else
 827                 descriptor = source_package->descriptor;
 828         }
 829         if (!descriptor) {
 830             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
 831             continue;
 832         }
 833 #ifdef DEBUG
 834         PRINT_KEY("essence codec     ul", descriptor->essence_codec_ul);
 835         PRINT_KEY("essence container ul", descriptor->essence_container_ul);
 836 #endif
 837         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
 838         codec_ul = mxf_get_codec_ul(mxf_codec_uls, &descriptor->essence_codec_ul);
 839         st->codec->codec_id = codec_ul->id;
 840         if (descriptor->extradata) {
 841             st->codec->extradata = descriptor->extradata;
 842             st->codec->extradata_size = descriptor->extradata_size;
 843         }
 844         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 845             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, &descriptor->essence_container_ul);
 846             if (st->codec->codec_id == CODEC_ID_NONE)
 847                 st->codec->codec_id = container_ul->id;
 848             st->codec->width = descriptor->width;
 849             st->codec->height = descriptor->height;
 850             st->codec->bits_per_sample = descriptor->bits_per_sample; /* Uncompressed */
 851         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 852             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, &descriptor->essence_container_ul);
 853             if (st->codec->codec_id == CODEC_ID_NONE)
 854                 st->codec->codec_id = container_ul->id;
 855             st->codec->channels = descriptor->channels;
 856             st->codec->bits_per_sample = descriptor->bits_per_sample;
 857             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
 858             /* TODO: implement CODEC_ID_RAWAUDIO */
 859             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
 860                 if (descriptor->bits_per_sample == 24)
 861                     st->codec->codec_id = CODEC_ID_PCM_S24LE;
 862                 else if (descriptor->bits_per_sample == 32)
 863                     st->codec->codec_id = CODEC_ID_PCM_S32LE;
 864             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
 865                 if (descriptor->bits_per_sample == 24)
 866                     st->codec->codec_id = CODEC_ID_PCM_S24BE;
 867                 else if (descriptor->bits_per_sample == 32)
 868                     st->codec->codec_id = CODEC_ID_PCM_S32BE;
 869             } else if (st->codec->codec_id == CODEC_ID_MP2) {
 870                 st->need_parsing = 1;
 871             }
 872         }
 873         if (container_ul && container_ul->wrapping == Clip) {
 874             dprintf("stream %d: clip wrapped essence\n", st->index);
 875             st->need_parsing = 1;
 876         }
 877     }
 878     return 0;
 879 }
 880
 881 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
 882     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2F,0x00 }, mxf_read_metadata_preface },
 883     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage },
 884     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package },
 885     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package },
 886     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence },
 887     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip },
 888     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_multiple_descriptor },
 889     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor }, /* Generic Sound */
 890     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor }, /* CDCI */
 891     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor }, /* RGBA */
 892     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor }, /* MPEG 2 Video */
 893     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor }, /* Wave */
 894     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor }, /* AES3 */
 895     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track }, /* Static Track */
 896     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track }, /* Generic Track */
 897     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL },
 898 };
 899
 900 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 901 {
 902     MXFContext *mxf = s->priv_data;
 903     KLVPacket klv;
 904
 905     mxf->fc = s;
 906     while (!url_feof(&s->pb)) {
 907         const MXFMetadataReadTableEntry *function;
 908
 909         if (klv_read_packet(&klv, &s->pb) < 0) {
 910             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
 911             return -1;
 912         }
 913 #ifdef DEBUG
 914         PRINT_KEY("read header", klv.key);
 915 #endif
 916         if (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 (function = mxf_metadata_read_table; function->read; function++) {
 923             if (IS_KLV_KEY(klv.key, function->key)) {
 924                 if (function->read(mxf, &klv) < 0) {
 925                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
 926                     return -1;
 927                 }
 928                 break;
 929             }
 930         }
 931         if (!function->read)
 932             url_fskip(&s->pb, klv.length);
 933     }
 934     return mxf_parse_structural_metadata(mxf);
 935 }
 936
 937 static int mxf_read_close(AVFormatContext *s)
 938 {
 939     MXFContext *mxf = s->priv_data;
 940     int i;
 941
 942     av_freep(&mxf->packages_refs);
 943     av_freep(&mxf->essence_container_data_sets_refs);
 944     av_freep(&mxf->essence_containers_uls);
 945     for (i = 0; i < mxf->metadata_sets_count; i++) {
 946         switch (mxf->metadata_sets[i]->type) {
 947         case MultipleDescriptor:
 948             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
 949             break;
 950         case Sequence:
 951             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
 952             break;
 953         case SourcePackage:
 954         case MaterialPackage:
 955             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
 956             break;
 957         default:
 958             break;
 959         }
 960         av_freep(&mxf->metadata_sets[i]);
 961     }
 962     av_freep(&mxf->metadata_sets);
 963     return 0;
 964 }
 965
 966 static int mxf_probe(AVProbeData *p) {
 967     uint8_t *bufp = p->buf;
 968     uint8_t *end = p->buf + p->buf_size;
 969
 970     if (p->buf_size < sizeof(mxf_header_partition_pack_key))
 971         return 0;
 972
 973     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
 974     end -= sizeof(mxf_header_partition_pack_key);
 975     for (; bufp < end; bufp++) {
 976         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
 977             return AVPROBE_SCORE_MAX;
 978     }
 979     return 0;
 980 }
 981
 982 /* rudimentary binary seek */
 983 /* XXX: use MXF Index */
 984 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
 985 {
 986     AVStream *st = s->streams[stream_index];
 987     offset_t pos = url_ftell(&s->pb);
 988     int64_t seconds;
 989     int i;
 990
 991     if (!s->bit_rate || sample_time < 0)
 992         return -1;
 993     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
 994     url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
 995     /* sync on KLV essence element */
 996     for (i = 0; i < 12 && url_ftell(&s->pb) < s->file_size; i++) {
 997         int b = get_byte(&s->pb);
 998         if (b == mxf_essence_element_key[0])
 999             i = 0;
1000         else if (b != mxf_essence_element_key[i])
1001             i = -1;
1002     }
1003     if (i == 12) { /* found KLV key */
1004         url_fseek(&s->pb, -12, SEEK_CUR);
1005         av_update_cur_dts(s, st, sample_time);
1006         return 0;
1007     }
1008     url_fseek(&s->pb, pos, SEEK_SET);
1009     return -1;
1010 }
1011
1012 AVInputFormat mxf_demuxer = {
1013     "mxf",
1014     "MXF format",
1015     sizeof(MXFContext),
1016     mxf_probe,
1017     mxf_read_header,
1018     mxf_read_packet,
1019     mxf_read_close,
1020     mxf_read_seek,
1021 };