git.sesse.net Git - ffmpeg/blob - 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 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 "avformat.h"
  49
  50 typedef uint8_t UID[16];
  51
  52 enum MXFMetadataSetType {
  53     MaterialPackage,
  54     SourcePackage,
  55     SourceClip,
  56     TimecodeComponent,
  57     Sequence,
  58     MultipleDescriptor,
  59     Descriptor,
  60     Track,
  61     EssenceContainerData,
  62 };
  63
  64 typedef struct MXFStructuralComponent {
  65     UID uid;
  66     enum MXFMetadataSetType type;
  67     UID source_package_uid;
  68     UID data_definition_ul;
  69     int64_t duration;
  70     int64_t start_position;
  71     int source_track_id;
  72 } MXFStructuralComponent;
  73
  74 typedef struct MXFSequence {
  75     UID uid;
  76     enum MXFMetadataSetType type;
  77     UID data_definition_ul;
  78     UID *structural_components_refs;
  79     int structural_components_count;
  80     int64_t duration;
  81 } MXFSequence;
  82
  83 typedef struct MXFTrack {
  84     UID uid;
  85     enum MXFMetadataSetType type;
  86     MXFSequence *sequence; /* mandatory, and only one */
  87     UID sequence_ref;
  88     int track_id;
  89     uint8_t track_number[4];
  90     AVRational edit_rate;
  91 } MXFTrack;
  92
  93 typedef struct MXFDescriptor {
  94     UID uid;
  95     enum MXFMetadataSetType type;
  96     UID essence_container_ul;
  97     UID essence_codec_ul;
  98     AVRational sample_rate;
  99     AVRational aspect_ratio;
 100     int width;
 101     int height;
 102     int channels;
 103     int bits_per_sample;
 104     UID *sub_descriptors_refs;
 105     int sub_descriptors_count;
 106     int linked_track_id;
 107     uint8_t *extradata;
 108     int extradata_size;
 109 } MXFDescriptor;
 110
 111 typedef struct MXFPackage {
 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 MXFEssenceContainerData {
 122     UID uid;
 123     enum MXFMetadataSetType type;
 124     UID linked_package_uid;
 125 } MXFEssenceContainerData;
 126
 127 typedef struct {
 128     UID uid;
 129     enum MXFMetadataSetType type;
 130 } MXFMetadataSet;
 131
 132 typedef struct MXFContext {
 133     UID *packages_refs;
 134     int packages_count;
 135     UID *essence_container_data_sets_refs;
 136     int essence_container_data_sets_count;
 137     UID *essence_containers_uls; /* Universal Labels SMPTE RP224 */
 138     int essence_containers_uls_count;
 139     UID operational_pattern_ul;
 140     UID content_storage_uid;
 141     MXFMetadataSet **metadata_sets;
 142     int metadata_sets_count;
 143     AVFormatContext *fc;
 144 } MXFContext;
 145
 146 typedef struct KLVPacket {
 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 MXFCodecUL {
 158     UID uid;
 159     enum CodecID id;
 160     enum MXFWrappingScheme wrapping;
 161 } MXFCodecUL;
 162
 163 typedef struct MXFDataDefinitionUL {
 164     UID uid;
 165     enum CodecType type;
 166 } MXFDataDefinitionUL;
 167
 168 typedef struct MXFMetadataReadTableEntry {
 169     const UID key;
 170     int (*read)(MXFContext *mxf, KLVPacket *klv);
 171 } MXFMetadataReadTableEntry;
 172
 173 /* partial keys to match */
 174 static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
 175 static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
 176
 177 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
 178
 179 #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, \
 180                              (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])
 181
 182 static int64_t klv_decode_ber_length(ByteIOContext *pb)
 183 {
 184     int64_t size = 0;
 185     uint8_t length = get_byte(pb);
 186     int type = length >> 7;
 187
 188     if (type) { /* long form */
 189         int bytes_num = length & 0x7f;
 190         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
 191         if (bytes_num > 8)
 192             return -1;
 193         while (bytes_num--)
 194             size = size << 8 | get_byte(pb);
 195     } else {
 196         size = length & 0x7f;
 197     }
 198     return size;
 199 }
 200
 201 static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
 202 {
 203     klv->offset = url_ftell(pb);
 204     get_buffer(pb, klv->key, 16);
 205     klv->length = klv_decode_ber_length(pb);
 206     return klv->length == -1 ? -1 : 0;
 207 }
 208
 209 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
 210 {
 211     int i;
 212
 213     for (i = 0; i < s->nb_streams; i++) {
 214         MXFTrack *track = s->streams[i]->priv_data;
 215          /* SMPTE 379M 7.3 */
 216         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
 217             return i;
 218     }
 219     /* return 0 if only one stream, for OP Atom files with 0 as track number */
 220     return s->nb_streams == 1 ? 0 : -1;
 221 }
 222
 223 /* XXX: use AVBitStreamFilter */
 224 static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
 225 {
 226     uint8_t buffer[61444];
 227     uint8_t *buf_ptr, *end_ptr, *data_ptr;
 228
 229     if (length > 61444) /* worst case PAL 1920 samples 8 channels */
 230         return -1;
 231     get_buffer(pb, buffer, length);
 232     av_new_packet(pkt, length);
 233     data_ptr = pkt->data;
 234     end_ptr = buffer + length;
 235     buf_ptr = buffer + 4; /* skip SMPTE 331M header */
 236     for (; buf_ptr < end_ptr; buf_ptr += 4) {
 237         if (st->codec->bits_per_sample == 24) {
 238             data_ptr[0] = (buf_ptr[2] >> 4) | ((buf_ptr[3] & 0x0f) << 4);
 239             data_ptr[1] = (buf_ptr[1] >> 4) | ((buf_ptr[2] & 0x0f) << 4);
 240             data_ptr[2] = (buf_ptr[0] >> 4) | ((buf_ptr[1] & 0x0f) << 4);
 241             data_ptr += 3;
 242         } else {
 243             data_ptr[0] = (buf_ptr[2] >> 4) | ((buf_ptr[3] & 0x0f) << 4);
 244             data_ptr[1] = (buf_ptr[1] >> 4) | ((buf_ptr[2] & 0x0f) << 4);
 245             data_ptr += 2;
 246         }
 247     }
 248     pkt->size = data_ptr - pkt->data;
 249     return 0;
 250 }
 251
 252 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
 253 {
 254     KLVPacket klv;
 255
 256     while (!url_feof(&s->pb)) {
 257         if (klv_read_packet(&klv, &s->pb) < 0) {
 258             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
 259             return -1;
 260         }
 261 #ifdef DEBUG
 262         PRINT_KEY("read packet", klv.key);
 263 #endif
 264         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
 265             int index = mxf_get_stream_index(s, &klv);
 266             if (index < 0) {
 267                 av_log(s, AV_LOG_ERROR, "error getting stream index\n");
 268                 url_fskip(&s->pb, klv.length);
 269                 return -1;
 270             }
 271             /* check for 8 channels AES3 element */
 272             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
 273                 if (mxf_get_d10_aes3_packet(&s->pb, s->streams[index], pkt, klv.length) < 0) {
 274                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
 275                     return -1;
 276                 }
 277             } else
 278                 av_get_packet(&s->pb, pkt, klv.length);
 279             pkt->stream_index = index;
 280             return 0;
 281         } else
 282             url_fskip(&s->pb, klv.length);
 283     }
 284     return AVERROR_IO;
 285 }
 286
 287 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
 288 {
 289     mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
 290     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
 291     mxf->metadata_sets_count++;
 292     return 0;
 293 }
 294
 295 static int mxf_read_metadata_preface(MXFContext *mxf, KLVPacket *klv)
 296 {
 297     ByteIOContext *pb = &mxf->fc->pb;
 298     int bytes_read = 0;
 299
 300     while (bytes_read < klv->length) {
 301         int tag = get_be16(pb);
 302         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */
 303
 304         switch (tag) {
 305         case 0x3B03:
 306             get_buffer(pb, mxf->content_storage_uid, 16);
 307             break;
 308         case 0x3B09:
 309             get_buffer(pb, mxf->operational_pattern_ul, 16);
 310             break;
 311         case 0x3B0A:
 312             mxf->essence_containers_uls_count = get_be32(pb);
 313             if (mxf->essence_containers_uls_count >= UINT_MAX / sizeof(UID))
 314                 return -1;
 315             mxf->essence_containers_uls = av_malloc(mxf->essence_containers_uls_count * sizeof(UID));
 316             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 317             get_buffer(pb, (uint8_t *)mxf->essence_containers_uls, mxf->essence_containers_uls_count * sizeof(UID));
 318             break;
 319         default:
 320             url_fskip(pb, size);
 321         }
 322         bytes_read += size + 4;
 323     }
 324     return 0;
 325 }
 326
 327 static int mxf_read_metadata_content_storage(MXFContext *mxf, KLVPacket *klv)
 328 {
 329     ByteIOContext *pb = &mxf->fc->pb;
 330     int bytes_read = 0;
 331
 332     while (bytes_read < klv->length) {
 333         int tag = get_be16(pb);
 334         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */
 335
 336         dprintf("tag 0x%04X, size %d\n", tag, size);
 337         switch (tag) {
 338         case 0x1901:
 339             mxf->packages_count = get_be32(pb);
 340             if (mxf->packages_count >= UINT_MAX / sizeof(UID))
 341                 return -1;
 342             mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
 343             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 344             get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
 345             break;
 346         case 0x1902:
 347             mxf->essence_container_data_sets_count = get_be32(pb);
 348             if (mxf->essence_container_data_sets_count >= UINT_MAX / sizeof(UID))
 349                 return -1;
 350             mxf->essence_container_data_sets_refs = av_malloc(mxf->essence_container_data_sets_count * sizeof(UID));
 351             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 352             get_buffer(pb, (uint8_t *)mxf->essence_container_data_sets_refs, mxf->essence_container_data_sets_count * sizeof(UID));
 353             break;
 354         default:
 355             url_fskip(pb, size);
 356         }
 357         bytes_read += size + 4;
 358     }
 359     return 0;
 360 }
 361
 362 static int mxf_read_metadata_source_clip(MXFContext *mxf, KLVPacket *klv)
 363 {
 364     ByteIOContext *pb = &mxf->fc->pb;
 365     MXFStructuralComponent *source_clip = av_mallocz(sizeof(*source_clip));
 366     int bytes_read = 0;
 367
 368     while (bytes_read < klv->length) {
 369         int tag = get_be16(pb);
 370         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */
 371
 372         bytes_read += size + 4;
 373         dprintf("tag 0x%04X, size %d\n", tag, size);
 374         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
 375             av_log(mxf->fc, AV_LOG_ERROR, "local tag 0x%04X with 0 size\n", tag);
 376             continue;
 377         }
 378         switch (tag) {
 379         case 0x3C0A:
 380             get_buffer(pb, source_clip->uid, 16);
 381             break;
 382         case 0x0202:
 383             source_clip->duration = get_be64(pb);
 384             break;
 385         case 0x1201:
 386             source_clip->start_position = get_be64(pb);
 387             break;
 388         case 0x1101:
 389             /* UMID, only get last 16 bytes */
 390             url_fskip(pb, 16);
 391             get_buffer(pb, source_clip->source_package_uid, 16);
 392             break;
 393         case 0x1102:
 394             source_clip->source_track_id = get_be32(pb);
 395             break;
 396         default:
 397             url_fskip(pb, size);
 398         }
 399     }
 400     source_clip->type = SourceClip;
 401     return mxf_add_metadata_set(mxf, source_clip);
 402 }
 403
 404 static int mxf_read_metadata_material_package(MXFContext *mxf, KLVPacket *klv)
 405 {
 406     ByteIOContext *pb = &mxf->fc->pb;
 407     MXFPackage *package = av_mallocz(sizeof(*package));
 408     int bytes_read = 0;
 409
 410     while (bytes_read < klv->length) {
 411         int tag = get_be16(pb);
 412         int size = get_be16(pb); /* KLV specified by 0x53 */
 413
 414         switch (tag) {
 415         case 0x3C0A:
 416             get_buffer(pb, package->uid, 16);
 417             break;
 418         case 0x4403:
 419             package->tracks_count = get_be32(pb);
 420             if (package->tracks_count >= UINT_MAX / sizeof(UID))
 421                 return -1;
 422             package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
 423             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 424             get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
 425             break;
 426         default:
 427             url_fskip(pb, size);
 428         }
 429         bytes_read += size + 4;
 430     }
 431     package->type = MaterialPackage;
 432     return mxf_add_metadata_set(mxf, package);
 433 }
 434
 435 static int mxf_read_metadata_track(MXFContext *mxf, KLVPacket *klv)
 436 {
 437     ByteIOContext *pb = &mxf->fc->pb;
 438     MXFTrack *track = av_mallocz(sizeof(*track));
 439     int bytes_read = 0;
 440
 441     while (bytes_read < klv->length) {
 442         int tag = get_be16(pb);
 443         int size = get_be16(pb); /* KLV specified by 0x53 */
 444
 445         dprintf("tag 0x%04X, size %d\n", tag, size);
 446         switch (tag) {
 447         case 0x3C0A:
 448             get_buffer(pb, track->uid, 16);
 449             break;
 450         case 0x4801:
 451             track->track_id = get_be32(pb);
 452             break;
 453         case 0x4804:
 454             get_buffer(pb, track->track_number, 4);
 455             break;
 456         case 0x4B01:
 457             track->edit_rate.den = get_be32(pb);
 458             track->edit_rate.num = get_be32(pb);
 459             break;
 460         case 0x4803:
 461             get_buffer(pb, track->sequence_ref, 16);
 462             break;
 463         default:
 464             url_fskip(pb, size);
 465         }
 466         bytes_read += size + 4;
 467     }
 468     track->type = Track;
 469     return mxf_add_metadata_set(mxf, track);
 470 }
 471
 472 static int mxf_read_metadata_sequence(MXFContext *mxf, KLVPacket *klv)
 473 {
 474     ByteIOContext *pb = &mxf->fc->pb;
 475     MXFSequence *sequence = av_mallocz(sizeof(*sequence));
 476     int bytes_read = 0;
 477
 478     while (bytes_read < klv->length) {
 479         int tag = get_be16(pb);
 480         int size = get_be16(pb); /* KLV specified by 0x53 */
 481
 482         dprintf("tag 0x%04X, size %d\n", tag, size);
 483         switch (tag) {
 484         case 0x3C0A:
 485             get_buffer(pb, sequence->uid, 16);
 486             break;
 487         case 0x0202:
 488             sequence->duration = get_be64(pb);
 489             break;
 490         case 0x0201:
 491             get_buffer(pb, sequence->data_definition_ul, 16);
 492             break;
 493         case 0x1001:
 494             sequence->structural_components_count = get_be32(pb);
 495             if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
 496                 return -1;
 497             sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
 498             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 499             get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
 500             break;
 501         default:
 502             url_fskip(pb, size);
 503         }
 504         bytes_read += size + 4;
 505     }
 506     sequence->type = Sequence;
 507     return mxf_add_metadata_set(mxf, sequence);
 508 }
 509
 510 static int mxf_read_metadata_source_package(MXFContext *mxf, KLVPacket *klv)
 511 {
 512     ByteIOContext *pb = &mxf->fc->pb;
 513     MXFPackage *package = av_mallocz(sizeof(*package));
 514     int bytes_read = 0;
 515
 516     while (bytes_read < klv->length) {
 517         int tag = get_be16(pb);
 518         int size = get_be16(pb); /* KLV specified by 0x53 */
 519
 520         dprintf("tag 0x%04X, size %d\n", tag, size);
 521         switch (tag) {
 522         case 0x3C0A:
 523             get_buffer(pb, package->uid, 16);
 524             break;
 525         case 0x4403:
 526             package->tracks_count = get_be32(pb);
 527             if (package->tracks_count >= UINT_MAX / sizeof(UID))
 528                 return -1;
 529             package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
 530             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 531             get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
 532             break;
 533         case 0x4401:
 534             /* UMID, only get last 16 bytes */
 535             url_fskip(pb, 16);
 536             get_buffer(pb, package->package_uid, 16);
 537             break;
 538         case 0x4701:
 539             get_buffer(pb, package->descriptor_ref, 16);
 540             break;
 541         default:
 542             url_fskip(pb, size);
 543         }
 544         bytes_read += size + 4;
 545     }
 546     package->type = SourcePackage;
 547     return mxf_add_metadata_set(mxf, package);
 548 }
 549
 550 static int mxf_read_metadata_multiple_descriptor(MXFContext *mxf, KLVPacket *klv)
 551 {
 552     ByteIOContext *pb = &mxf->fc->pb;
 553     MXFDescriptor *descriptor = av_mallocz(sizeof(*descriptor));
 554     int bytes_read = 0;
 555
 556     while (bytes_read < klv->length) {
 557         int tag = get_be16(pb);
 558         int size = get_be16(pb); /* KLV specified by 0x53 */
 559
 560         dprintf("tag 0x%04X, size %d\n", tag, size);
 561         switch (tag) {
 562         case 0x3C0A:
 563             get_buffer(pb, descriptor->uid, 16);
 564             break;
 565         case 0x3F01:
 566             descriptor->sub_descriptors_count = get_be32(pb);
 567             if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
 568                 return -1;
 569             descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
 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         default:
 574             url_fskip(pb, size);
 575         }
 576         bytes_read += size + 4;
 577     }
 578     descriptor->type = MultipleDescriptor;
 579     return mxf_add_metadata_set(mxf, descriptor);
 580 }
 581
 582 static void mxf_read_metadata_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
 583 {
 584     int code;
 585
 586     do {
 587         code = get_byte(pb);
 588         dprintf("pixel layout: code 0x%x\n", code);
 589         switch (code) {
 590         case 0x52: /* R */
 591             descriptor->bits_per_sample += get_byte(pb);
 592             break;
 593         case 0x47: /* G */
 594             descriptor->bits_per_sample += get_byte(pb);
 595             break;
 596         case 0x42: /* B */
 597             descriptor->bits_per_sample += get_byte(pb);
 598             break;
 599         default:
 600             get_byte(pb);
 601         }
 602     } while (code != 0); /* SMPTE 377M E.2.46 */
 603 }
 604
 605 static int mxf_read_metadata_generic_descriptor(MXFContext *mxf, KLVPacket *klv)
 606 {
 607     ByteIOContext *pb = &mxf->fc->pb;
 608     MXFDescriptor *descriptor = av_mallocz(sizeof(*descriptor));
 609     int bytes_read = 0;
 610
 611     while (bytes_read < klv->length) {
 612         int tag = get_be16(pb);
 613         int size = get_be16(pb); /* KLV specified by 0x53 */
 614
 615         dprintf("tag 0x%04X, size %d\n", tag, size);
 616         switch (tag) {
 617         case 0x3C0A:
 618             get_buffer(pb, descriptor->uid, 16);
 619             break;
 620         case 0x3004:
 621             get_buffer(pb, descriptor->essence_container_ul, 16);
 622             break;
 623         case 0x3006:
 624             descriptor->linked_track_id = get_be32(pb);
 625             break;
 626         case 0x3201: /* PictureEssenceCoding */
 627             get_buffer(pb, descriptor->essence_codec_ul, 16);
 628             break;
 629         case 0x3203:
 630             descriptor->width = get_be32(pb);
 631             break;
 632         case 0x3202:
 633             descriptor->height = get_be32(pb);
 634             break;
 635         case 0x320E:
 636             descriptor->aspect_ratio.num = get_be32(pb);
 637             descriptor->aspect_ratio.den = get_be32(pb);
 638             break;
 639         case 0x3D03:
 640             descriptor->sample_rate.num = get_be32(pb);
 641             descriptor->sample_rate.den = get_be32(pb);
 642             break;
 643         case 0x3D06: /* SoundEssenceCompression */
 644             get_buffer(pb, descriptor->essence_codec_ul, 16);
 645             break;
 646         case 0x3D07:
 647             descriptor->channels = get_be32(pb);
 648             break;
 649         case 0x3D01:
 650             descriptor->bits_per_sample = get_be32(pb);
 651             break;
 652         case 0x3401:
 653             mxf_read_metadata_pixel_layout(pb, descriptor);
 654             break;
 655         case 0x8201: /* Private tag used by SONY C0023S01.mxf */
 656             descriptor->extradata = av_malloc(size);
 657             descriptor->extradata_size = size;
 658             get_buffer(pb, descriptor->extradata, size);
 659             break;
 660         default:
 661             url_fskip(pb, size);
 662         }
 663         bytes_read += size + 4;
 664     }
 665     descriptor->type = Descriptor;
 666     return mxf_add_metadata_set(mxf, descriptor);
 667 }
 668
 669 /* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */
 670 static const MXFDataDefinitionUL mxf_data_definition_uls[] = {
 671     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },
 672     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },
 673     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },
 674     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },
 675 };
 676
 677 static const MXFCodecUL mxf_codec_uls[] = {
 678     /* PictureEssenceCoding */
 679     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */
 680     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL I-Frame */
 681     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */
 682     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */
 683     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */
 684     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */
 685     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */
 686     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */
 687     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */
 688     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */
 689     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */
 690     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */
 691     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */
 692     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */
 693     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */
 694     /* SoundEssenceCompression */
 695     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */
 696     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },
 697     { { 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 */
 698     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },
 699     { { 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 */
 700     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },
 701     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */
 702   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */
 703     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
 704 };
 705
 706 static const MXFCodecUL mxf_picture_essence_container_uls[] = {
 707     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */
 708     { { 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 */
 709     { { 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 */
 710     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
 711 };
 712
 713 static const MXFCodecUL mxf_sound_essence_container_uls[] = {
 714     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */
 715     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */
 716     { { 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 */
 717     { { 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 */
 718     { { 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 */
 719     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x05,0x01 },  CODEC_ID_PCM_S16BE, Frame }, /* D-10 Mapping 30Mbps PAL Extended Template */
 720     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 },  CODEC_ID_PCM_S16BE, Frame }, /* D-10 Mapping 50Mbps PAL Extended Template */
 721     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
 722 };
 723
 724 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
 725 {
 726     while (uls->id != CODEC_ID_NONE) {
 727         if(!memcmp(uls->uid, *uid, 16))
 728             break;
 729         uls++;
 730     }
 731     return uls;
 732 }
 733
 734 static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)
 735 {
 736     while (uls->type != CODEC_TYPE_DATA) {
 737         if(!memcmp(uls->uid, *uid, 16))
 738             break;
 739         uls++;
 740     }
 741     return uls->type;
 742 }
 743
 744 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref)
 745 {
 746     int i;
 747
 748     if (!strong_ref)
 749         return NULL;
 750     for (i = 0; i < mxf->metadata_sets_count; i++) {
 751         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16)) {
 752             return mxf->metadata_sets[i];
 753         }
 754     }
 755     return NULL;
 756 }
 757
 758 static int mxf_parse_structural_metadata(MXFContext *mxf)
 759 {
 760     MXFPackage *material_package = NULL;
 761     MXFPackage *source_package = NULL;
 762     MXFPackage *temp_package = NULL;
 763     int i, j, k;
 764
 765     dprintf("metadata sets count %d\n", mxf->metadata_sets_count);
 766     /* TODO: handle multiple material packages (OP3x) */
 767     for (i = 0; i < mxf->packages_count; i++) {
 768         if (!(temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i]))) {
 769             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve package strong ref\n");
 770             return -1;
 771         }
 772         if (temp_package->type == MaterialPackage) {
 773             material_package = temp_package;
 774             break;
 775         }
 776     }
 777     if (!material_package) {
 778         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
 779         return -1;
 780     }
 781
 782     for (i = 0; i < material_package->tracks_count; i++) {
 783         MXFTrack *material_track = NULL;
 784         MXFTrack *source_track = NULL;
 785         MXFTrack *temp_track = NULL;
 786         MXFDescriptor *descriptor = NULL;
 787         MXFStructuralComponent *component = NULL;
 788         const MXFCodecUL *codec_ul = NULL;
 789         const MXFCodecUL *container_ul = NULL;
 790         AVStream *st;
 791
 792         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i]))) {
 793             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
 794             continue;
 795         }
 796
 797         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref))) {
 798             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
 799             return -1;
 800         }
 801
 802         /* TODO: handle multiple source clips */
 803         for (j = 0; j < material_track->sequence->structural_components_count; j++) {
 804             /* TODO: handle timecode component */
 805             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j]);
 806             if (!component || component->type != SourceClip)
 807                 continue;
 808
 809             for (k = 0; k < mxf->packages_count; k++) {
 810                 if (!(temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k]))) {
 811                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
 812                     return -1;
 813                 }
 814                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
 815                     source_package = temp_package;
 816                     break;
 817                 }
 818             }
 819             if (!source_package) {
 820                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
 821                 break;
 822             }
 823             for (k = 0; k < source_package->tracks_count; k++) {
 824                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k]))) {
 825                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
 826                     return -1;
 827                 }
 828                 if (temp_track->track_id == component->source_track_id) {
 829                     source_track = temp_track;
 830                     break;
 831                 }
 832             }
 833             if (!source_track) {
 834                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
 835                 break;
 836             }
 837         }
 838         if (!source_track)
 839             continue;
 840
 841         st = av_new_stream(mxf->fc, source_track->track_id);
 842         st->priv_data = source_track;
 843         st->duration = component->duration;
 844         if (st->duration == -1)
 845             st->duration = AV_NOPTS_VALUE;
 846         st->start_time = component->start_position;
 847         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
 848
 849         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref))) {
 850             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
 851             return -1;
 852         }
 853
 854 #ifdef DEBUG
 855         PRINT_KEY("data definition   ul", source_track->sequence->data_definition_ul);
 856 #endif
 857         st->codec->codec_type = mxf_get_codec_type(mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
 858
 859         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref);
 860         if (source_package->descriptor) {
 861             if (source_package->descriptor->type == MultipleDescriptor) {
 862                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
 863                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j]);
 864
 865                     if (!sub_descriptor) {
 866                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
 867                         continue;
 868                     }
 869                     if (sub_descriptor->linked_track_id == source_track->track_id) {
 870                         descriptor = sub_descriptor;
 871                         break;
 872                     }
 873                 }
 874             } else
 875                 descriptor = source_package->descriptor;
 876         }
 877         if (!descriptor) {
 878             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
 879             continue;
 880         }
 881 #ifdef DEBUG
 882         PRINT_KEY("essence codec     ul", descriptor->essence_codec_ul);
 883         PRINT_KEY("essence container ul", descriptor->essence_container_ul);
 884 #endif
 885         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
 886         codec_ul = mxf_get_codec_ul(mxf_codec_uls, &descriptor->essence_codec_ul);
 887         st->codec->codec_id = codec_ul->id;
 888         if (descriptor->extradata) {
 889             st->codec->extradata = descriptor->extradata;
 890             st->codec->extradata_size = descriptor->extradata_size;
 891         }
 892         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 893             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, &descriptor->essence_container_ul);
 894             if (st->codec->codec_id == CODEC_ID_NONE)
 895                 st->codec->codec_id = container_ul->id;
 896             st->codec->width = descriptor->width;
 897             st->codec->height = descriptor->height;
 898             st->codec->bits_per_sample = descriptor->bits_per_sample; /* Uncompressed */
 899             st->need_parsing = 2; /* only parse headers */
 900         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 901             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, &descriptor->essence_container_ul);
 902             if (st->codec->codec_id == CODEC_ID_NONE)
 903                 st->codec->codec_id = container_ul->id;
 904             st->codec->channels = descriptor->channels;
 905             st->codec->bits_per_sample = descriptor->bits_per_sample;
 906             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
 907             /* TODO: implement CODEC_ID_RAWAUDIO */
 908             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
 909                 if (descriptor->bits_per_sample == 24)
 910                     st->codec->codec_id = CODEC_ID_PCM_S24LE;
 911                 else if (descriptor->bits_per_sample == 32)
 912                     st->codec->codec_id = CODEC_ID_PCM_S32LE;
 913             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
 914                 if (descriptor->bits_per_sample == 24)
 915                     st->codec->codec_id = CODEC_ID_PCM_S24BE;
 916                 else if (descriptor->bits_per_sample == 32)
 917                     st->codec->codec_id = CODEC_ID_PCM_S32BE;
 918                 if (descriptor->essence_container_ul[13] == 0x01) /* D-10 Mapping */
 919                     st->codec->channels = 8; /* force channels to 8 */
 920             } else if (st->codec->codec_id == CODEC_ID_MP2) {
 921                 st->need_parsing = 1;
 922             }
 923         }
 924         if (container_ul && container_ul->wrapping == Clip) {
 925             dprintf("stream %d: clip wrapped essence\n", st->index);
 926             st->need_parsing = 1;
 927         }
 928     }
 929     return 0;
 930 }
 931
 932 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
 933     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2F,0x00 }, mxf_read_metadata_preface },
 934     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage },
 935     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package },
 936     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package },
 937     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence },
 938     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip },
 939     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_multiple_descriptor },
 940     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor }, /* Generic Sound */
 941     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor }, /* CDCI */
 942     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor }, /* RGBA */
 943     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor }, /* MPEG 2 Video */
 944     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor }, /* Wave */
 945     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor }, /* AES3 */
 946     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track }, /* Static Track */
 947     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track }, /* Generic Track */
 948     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL },
 949 };
 950
 951 static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
 952 {
 953     int i, b;
 954     for (i = 0; i < size && !url_feof(pb); i++) {
 955         b = get_byte(pb);
 956         if (b == key[0])
 957             i = 0;
 958         else if (b != key[i])
 959             i = -1;
 960     }
 961     return i == size;
 962 }
 963
 964 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 965 {
 966     MXFContext *mxf = s->priv_data;
 967     KLVPacket klv;
 968
 969     if (!mxf_read_sync(&s->pb, mxf_header_partition_pack_key, 14)) {
 970         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
 971         return -1;
 972     }
 973     url_fseek(&s->pb, -14, SEEK_CUR);
 974     mxf->fc = s;
 975     while (!url_feof(&s->pb)) {
 976         const MXFMetadataReadTableEntry *function;
 977
 978         if (klv_read_packet(&klv, &s->pb) < 0) {
 979             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
 980             return -1;
 981         }
 982 #ifdef DEBUG
 983         PRINT_KEY("read header", klv.key);
 984 #endif
 985         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
 986             /* FIXME avoid seek */
 987             url_fseek(&s->pb, klv.offset, SEEK_SET);
 988             break;
 989         }
 990
 991         for (function = mxf_metadata_read_table; function->read; function++) {
 992             if (IS_KLV_KEY(klv.key, function->key)) {
 993                 if (function->read(mxf, &klv) < 0) {
 994                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
 995                     return -1;
 996                 }
 997                 break;
 998             }
 999         }
1000         if (!function->read)
1001             url_fskip(&s->pb, klv.length);
1002     }
1003     return mxf_parse_structural_metadata(mxf);
1004 }
1005
1006 static int mxf_read_close(AVFormatContext *s)
1007 {
1008     MXFContext *mxf = s->priv_data;
1009     int i;
1010
1011     av_freep(&mxf->packages_refs);
1012     av_freep(&mxf->essence_container_data_sets_refs);
1013     av_freep(&mxf->essence_containers_uls);
1014     for (i = 0; i < mxf->metadata_sets_count; i++) {
1015         switch (mxf->metadata_sets[i]->type) {
1016         case MultipleDescriptor:
1017             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
1018             break;
1019         case Sequence:
1020             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
1021             break;
1022         case SourcePackage:
1023         case MaterialPackage:
1024             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
1025             break;
1026         default:
1027             break;
1028         }
1029         av_freep(&mxf->metadata_sets[i]);
1030     }
1031     av_freep(&mxf->metadata_sets);
1032     return 0;
1033 }
1034
1035 static int mxf_probe(AVProbeData *p) {
1036     uint8_t *bufp = p->buf;
1037     uint8_t *end = p->buf + p->buf_size;
1038
1039     if (p->buf_size < sizeof(mxf_header_partition_pack_key))
1040         return 0;
1041
1042     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
1043     end -= sizeof(mxf_header_partition_pack_key);
1044     for (; bufp < end; bufp++) {
1045         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
1046             return AVPROBE_SCORE_MAX;
1047     }
1048     return 0;
1049 }
1050
1051 /* rudimentary binary seek */
1052 /* XXX: use MXF Index */
1053 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
1054 {
1055     AVStream *st = s->streams[stream_index];
1056     int64_t seconds;
1057
1058     if (!s->bit_rate)
1059         return -1;
1060     if (sample_time < 0)
1061         sample_time = 0;
1062     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
1063     url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
1064     if (!mxf_read_sync(&s->pb, mxf_essence_element_key, 12))
1065         return -1;
1066
1067     /* found KLV key */
1068     url_fseek(&s->pb, -12, SEEK_CUR);
1069     av_update_cur_dts(s, st, sample_time);
1070     return 0;
1071 }
1072
1073 AVInputFormat mxf_demuxer = {
1074     "mxf",
1075     "MXF format",
1076     sizeof(MXFContext),
1077     mxf_probe,
1078     mxf_read_header,
1079     mxf_read_packet,
1080     mxf_read_close,
1081     mxf_read_seek,
1082 };