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     AnyType,
  54     MaterialPackage,
  55     SourcePackage,
  56     SourceClip,
  57     TimecodeComponent,
  58     Sequence,
  59     MultipleDescriptor,
  60     Descriptor,
  61     Track,
  62     EssenceContainerData,
  63 };
  64
  65 typedef struct MXFStructuralComponent {
  66     UID uid;
  67     enum MXFMetadataSetType type;
  68     UID source_package_uid;
  69     UID data_definition_ul;
  70     int64_t duration;
  71     int64_t start_position;
  72     int source_track_id;
  73 } MXFStructuralComponent;
  74
  75 typedef struct MXFSequence {
  76     UID uid;
  77     enum MXFMetadataSetType type;
  78     UID data_definition_ul;
  79     UID *structural_components_refs;
  80     int structural_components_count;
  81     int64_t duration;
  82 } MXFSequence;
  83
  84 typedef struct MXFTrack {
  85     UID uid;
  86     enum MXFMetadataSetType type;
  87     MXFSequence *sequence; /* mandatory, and only one */
  88     UID sequence_ref;
  89     int track_id;
  90     uint8_t track_number[4];
  91     AVRational edit_rate;
  92 } MXFTrack;
  93
  94 typedef struct MXFDescriptor {
  95     UID uid;
  96     enum MXFMetadataSetType type;
  97     UID essence_container_ul;
  98     UID essence_codec_ul;
  99     AVRational sample_rate;
 100     AVRational aspect_ratio;
 101     int width;
 102     int height;
 103     int channels;
 104     int bits_per_sample;
 105     UID *sub_descriptors_refs;
 106     int sub_descriptors_count;
 107     int linked_track_id;
 108     uint8_t *extradata;
 109     int extradata_size;
 110 } MXFDescriptor;
 111
 112 typedef struct MXFPackage {
 113     UID uid;
 114     enum MXFMetadataSetType type;
 115     UID package_uid;
 116     UID *tracks_refs;
 117     int tracks_count;
 118     MXFDescriptor *descriptor; /* only one */
 119     UID descriptor_ref;
 120 } MXFPackage;
 121
 122 typedef struct MXFEssenceContainerData {
 123     UID uid;
 124     enum MXFMetadataSetType type;
 125     UID linked_package_uid;
 126 } MXFEssenceContainerData;
 127
 128 typedef struct {
 129     UID uid;
 130     enum MXFMetadataSetType type;
 131 } MXFMetadataSet;
 132
 133 typedef struct MXFContext {
 134     UID *packages_refs;
 135     int packages_count;
 136     UID *essence_container_data_sets_refs;
 137     int essence_container_data_sets_count;
 138     UID *essence_containers_uls; /* Universal Labels SMPTE RP224 */
 139     int essence_containers_uls_count;
 140     UID operational_pattern_ul;
 141     UID content_storage_uid;
 142     MXFMetadataSet **metadata_sets;
 143     int metadata_sets_count;
 144     uint8_t *sync_key;
 145     AVFormatContext *fc;
 146 } MXFContext;
 147
 148 typedef struct KLVPacket {
 149     UID key;
 150     offset_t offset;
 151     uint64_t length;
 152 } KLVPacket;
 153
 154 enum MXFWrappingScheme {
 155     Frame,
 156     Clip,
 157 };
 158
 159 typedef struct MXFCodecUL {
 160     UID uid;
 161     enum CodecID id;
 162     enum MXFWrappingScheme wrapping;
 163 } MXFCodecUL;
 164
 165 typedef struct MXFDataDefinitionUL {
 166     UID uid;
 167     enum CodecType type;
 168 } MXFDataDefinitionUL;
 169
 170 typedef struct MXFMetadataReadTableEntry {
 171     const UID key;
 172     int (*read)(MXFContext *mxf, KLVPacket *klv);
 173 } MXFMetadataReadTableEntry;
 174
 175 /* partial keys to match */
 176 static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
 177 static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
 178 /* complete keys to match */
 179 static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
 180
 181 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
 182
 183 #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, \
 184                              (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])
 185
 186 static int64_t klv_decode_ber_length(ByteIOContext *pb)
 187 {
 188     uint64_t size = get_byte(pb);
 189     if (size & 0x80) { /* long form */
 190         int bytes_num = size & 0x7f;
 191         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
 192         if (bytes_num > 8)
 193             return -1;
 194         size = 0;
 195         while (bytes_num--)
 196             size = size << 8 | get_byte(pb);
 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     MXFContext *mxf = s->priv_data;
 255     KLVPacket klv;
 256
 257     while (!url_feof(&s->pb)) {
 258         if (klv_read_packet(&klv, &s->pb) < 0) {
 259             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
 260             return -1;
 261         }
 262 #ifdef DEBUG
 263         PRINT_KEY("read packet", klv.key);
 264 #endif
 265         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
 266             mxf->sync_key = mxf_encrypted_triplet_key;
 267             av_log(s, AV_LOG_ERROR, "encrypted triplet not supported\n");
 268             return -1;
 269         }
 270         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
 271             int index = mxf_get_stream_index(s, &klv);
 272             if (index < 0) {
 273                 av_log(s, AV_LOG_ERROR, "error getting stream index\n");
 274                 url_fskip(&s->pb, klv.length);
 275                 return -1;
 276             }
 277             /* check for 8 channels AES3 element */
 278             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
 279                 if (mxf_get_d10_aes3_packet(&s->pb, s->streams[index], pkt, klv.length) < 0) {
 280                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
 281                     return -1;
 282                 }
 283             } else
 284                 av_get_packet(&s->pb, pkt, klv.length);
 285             pkt->stream_index = index;
 286             return 0;
 287         } else
 288             url_fskip(&s->pb, klv.length);
 289     }
 290     return AVERROR_IO;
 291 }
 292
 293 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
 294 {
 295     mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
 296     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
 297     mxf->metadata_sets_count++;
 298     return 0;
 299 }
 300
 301 static int mxf_read_metadata_preface(MXFContext *mxf, KLVPacket *klv)
 302 {
 303     ByteIOContext *pb = &mxf->fc->pb;
 304     int bytes_read = 0;
 305
 306     while (bytes_read < klv->length) {
 307         int tag = get_be16(pb);
 308         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */
 309
 310         switch (tag) {
 311         case 0x3B03:
 312             get_buffer(pb, mxf->content_storage_uid, 16);
 313             break;
 314         case 0x3B09:
 315             get_buffer(pb, mxf->operational_pattern_ul, 16);
 316             break;
 317         case 0x3B0A:
 318             mxf->essence_containers_uls_count = get_be32(pb);
 319             if (mxf->essence_containers_uls_count >= UINT_MAX / sizeof(UID))
 320                 return -1;
 321             mxf->essence_containers_uls = av_malloc(mxf->essence_containers_uls_count * sizeof(UID));
 322             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 323             get_buffer(pb, (uint8_t *)mxf->essence_containers_uls, mxf->essence_containers_uls_count * sizeof(UID));
 324             break;
 325         default:
 326             url_fskip(pb, size);
 327         }
 328         bytes_read += size + 4;
 329     }
 330     return 0;
 331 }
 332
 333 static int mxf_read_metadata_content_storage(MXFContext *mxf, KLVPacket *klv)
 334 {
 335     ByteIOContext *pb = &mxf->fc->pb;
 336     int bytes_read = 0;
 337
 338     while (bytes_read < klv->length) {
 339         int tag = get_be16(pb);
 340         int size = get_be16(pb); /* SMPTE 336M Table 8 KLV specified length, 0x53 */
 341
 342         dprintf("tag 0x%04X, size %d\n", tag, size);
 343         switch (tag) {
 344         case 0x1901:
 345             mxf->packages_count = get_be32(pb);
 346             if (mxf->packages_count >= UINT_MAX / sizeof(UID))
 347                 return -1;
 348             mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
 349             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 350             get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
 351             break;
 352         case 0x1902:
 353             mxf->essence_container_data_sets_count = get_be32(pb);
 354             if (mxf->essence_container_data_sets_count >= UINT_MAX / sizeof(UID))
 355                 return -1;
 356             mxf->essence_container_data_sets_refs = av_malloc(mxf->essence_container_data_sets_count * sizeof(UID));
 357             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 358             get_buffer(pb, (uint8_t *)mxf->essence_container_data_sets_refs, mxf->essence_container_data_sets_count * sizeof(UID));
 359             break;
 360         default:
 361             url_fskip(pb, size);
 362         }
 363         bytes_read += size + 4;
 364     }
 365     return 0;
 366 }
 367
 368 #define MXF_READ_LOCAL_TAGS_START(typename, ctype, name) \
 369     ByteIOContext *pb = &mxf->fc->pb;\
 370     ctype *name = av_mallocz(sizeof(*name));\
 371     int bytes_read = 0;\
 372 \
 373     while (bytes_read < klv->length) {\
 374         int tag = get_be16(pb);\
 375         int size = get_be16(pb); /* KLV specified by 0x53 */\
 376 \
 377         bytes_read += size + 4;\
 378         dprintf("tag 0x%04X, size %d\n", tag, size);\
 379         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */\
 380             av_log(mxf->fc, AV_LOG_ERROR, "local tag 0x%04X with 0 size\n", tag);\
 381             continue;\
 382         }\
 383         switch (tag) {\
 384         case 0x3C0A:\
 385             get_buffer(pb, name->uid, 16);\
 386             break;
 387
 388 #define MXF_READ_LOCAL_TAGS_STOP(typename, ctype, name)\
 389         default:\
 390             url_fskip(pb, size);\
 391         }\
 392     }\
 393     name->type = typename;\
 394     return mxf_add_metadata_set(mxf, name);
 395
 396 static int mxf_read_metadata_source_clip(MXFContext *mxf, KLVPacket *klv)
 397 {
 398 MXF_READ_LOCAL_TAGS_START(SourceClip, MXFStructuralComponent, source_clip)
 399         case 0x0202:
 400             source_clip->duration = get_be64(pb);
 401             break;
 402         case 0x1201:
 403             source_clip->start_position = get_be64(pb);
 404             break;
 405         case 0x1101:
 406             /* UMID, only get last 16 bytes */
 407             url_fskip(pb, 16);
 408             get_buffer(pb, source_clip->source_package_uid, 16);
 409             break;
 410         case 0x1102:
 411             source_clip->source_track_id = get_be32(pb);
 412             break;
 413 MXF_READ_LOCAL_TAGS_STOP(SourceClip, MXFStructuralComponent, source_clip)
 414 }
 415
 416 static int mxf_read_metadata_material_package(MXFContext *mxf, KLVPacket *klv)
 417 {
 418 MXF_READ_LOCAL_TAGS_START(MaterialPackage, MXFPackage, package)
 419         case 0x4403:
 420             package->tracks_count = get_be32(pb);
 421             if (package->tracks_count >= UINT_MAX / sizeof(UID))
 422                 return -1;
 423             package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
 424             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 425             get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
 426             break;
 427 MXF_READ_LOCAL_TAGS_STOP(MaterialPackage, MXFPackage, package)
 428 }
 429
 430 static int mxf_read_metadata_track(MXFContext *mxf, KLVPacket *klv)
 431 {
 432 MXF_READ_LOCAL_TAGS_START(Track, MXFTrack, track)
 433         case 0x4801:
 434             track->track_id = get_be32(pb);
 435             break;
 436         case 0x4804:
 437             get_buffer(pb, track->track_number, 4);
 438             break;
 439         case 0x4B01:
 440             track->edit_rate.den = get_be32(pb);
 441             track->edit_rate.num = get_be32(pb);
 442             break;
 443         case 0x4803:
 444             get_buffer(pb, track->sequence_ref, 16);
 445             break;
 446 MXF_READ_LOCAL_TAGS_STOP(Track, MXFTrack, track)
 447 }
 448
 449 static int mxf_read_metadata_sequence(MXFContext *mxf, KLVPacket *klv)
 450 {
 451 MXF_READ_LOCAL_TAGS_START(Sequence, MXFSequence, sequence)
 452         case 0x0202:
 453             sequence->duration = get_be64(pb);
 454             break;
 455         case 0x0201:
 456             get_buffer(pb, sequence->data_definition_ul, 16);
 457             break;
 458         case 0x1001:
 459             sequence->structural_components_count = get_be32(pb);
 460             if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
 461                 return -1;
 462             sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
 463             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 464             get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
 465             break;
 466 MXF_READ_LOCAL_TAGS_STOP(Sequence, MXFSequence, sequence)
 467 }
 468
 469 static int mxf_read_metadata_source_package(MXFContext *mxf, KLVPacket *klv)
 470 {
 471 MXF_READ_LOCAL_TAGS_START(SourcePackage, MXFPackage, package)
 472         case 0x4403:
 473             package->tracks_count = get_be32(pb);
 474             if (package->tracks_count >= UINT_MAX / sizeof(UID))
 475                 return -1;
 476             package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
 477             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 478             get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
 479             break;
 480         case 0x4401:
 481             /* UMID, only get last 16 bytes */
 482             url_fskip(pb, 16);
 483             get_buffer(pb, package->package_uid, 16);
 484             break;
 485         case 0x4701:
 486             get_buffer(pb, package->descriptor_ref, 16);
 487             break;
 488 MXF_READ_LOCAL_TAGS_STOP(SourcePackage, MXFPackage, package)
 489 }
 490
 491 static int mxf_read_metadata_multiple_descriptor(MXFContext *mxf, KLVPacket *klv)
 492 {
 493 MXF_READ_LOCAL_TAGS_START(MultipleDescriptor, MXFDescriptor, descriptor)
 494         case 0x3F01:
 495             descriptor->sub_descriptors_count = get_be32(pb);
 496             if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
 497                 return -1;
 498             descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
 499             url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 500             get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
 501             break;
 502 MXF_READ_LOCAL_TAGS_STOP(MultipleDescriptor, MXFDescriptor, descriptor)
 503 }
 504
 505 static void mxf_read_metadata_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
 506 {
 507     int code;
 508
 509     do {
 510         code = get_byte(pb);
 511         dprintf("pixel layout: code 0x%x\n", code);
 512         switch (code) {
 513         case 0x52: /* R */
 514             descriptor->bits_per_sample += get_byte(pb);
 515             break;
 516         case 0x47: /* G */
 517             descriptor->bits_per_sample += get_byte(pb);
 518             break;
 519         case 0x42: /* B */
 520             descriptor->bits_per_sample += get_byte(pb);
 521             break;
 522         default:
 523             get_byte(pb);
 524         }
 525     } while (code != 0); /* SMPTE 377M E.2.46 */
 526 }
 527
 528 static int mxf_read_metadata_generic_descriptor(MXFContext *mxf, KLVPacket *klv)
 529 {
 530 MXF_READ_LOCAL_TAGS_START(Descriptor, MXFDescriptor, descriptor)
 531         case 0x3004:
 532             get_buffer(pb, descriptor->essence_container_ul, 16);
 533             break;
 534         case 0x3006:
 535             descriptor->linked_track_id = get_be32(pb);
 536             break;
 537         case 0x3201: /* PictureEssenceCoding */
 538             get_buffer(pb, descriptor->essence_codec_ul, 16);
 539             break;
 540         case 0x3203:
 541             descriptor->width = get_be32(pb);
 542             break;
 543         case 0x3202:
 544             descriptor->height = get_be32(pb);
 545             break;
 546         case 0x320E:
 547             descriptor->aspect_ratio.num = get_be32(pb);
 548             descriptor->aspect_ratio.den = get_be32(pb);
 549             break;
 550         case 0x3D03:
 551             descriptor->sample_rate.num = get_be32(pb);
 552             descriptor->sample_rate.den = get_be32(pb);
 553             break;
 554         case 0x3D06: /* SoundEssenceCompression */
 555             get_buffer(pb, descriptor->essence_codec_ul, 16);
 556             break;
 557         case 0x3D07:
 558             descriptor->channels = get_be32(pb);
 559             break;
 560         case 0x3D01:
 561             descriptor->bits_per_sample = get_be32(pb);
 562             break;
 563         case 0x3401:
 564             mxf_read_metadata_pixel_layout(pb, descriptor);
 565             break;
 566         case 0x8201: /* Private tag used by SONY C0023S01.mxf */
 567             descriptor->extradata = av_malloc(size);
 568             descriptor->extradata_size = size;
 569             get_buffer(pb, descriptor->extradata, size);
 570             break;
 571 MXF_READ_LOCAL_TAGS_STOP(Descriptor, MXFDescriptor, descriptor)
 572 }
 573
 574 /* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */
 575 static const MXFDataDefinitionUL mxf_data_definition_uls[] = {
 576     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },
 577     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },
 578     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },
 579     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },
 580 };
 581
 582 static const MXFCodecUL mxf_codec_uls[] = {
 583     /* PictureEssenceCoding */
 584     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */
 585     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL I-Frame */
 586     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */
 587     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */
 588     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */
 589     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */
 590     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */
 591     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */
 592     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */
 593     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */
 594     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */
 595     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */
 596     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */
 597     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */
 598     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */
 599     /* SoundEssenceCompression */
 600     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */
 601     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },
 602     { { 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 */
 603     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },
 604     { { 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 */
 605     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },
 606     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */
 607   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */
 608     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
 609 };
 610
 611 static const MXFCodecUL mxf_picture_essence_container_uls[] = {
 612     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */
 613     { { 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 */
 614     { { 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 */
 615     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
 616 };
 617
 618 static const MXFCodecUL mxf_sound_essence_container_uls[] = {
 619     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */
 620     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */
 621     { { 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 */
 622     { { 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 */
 623     { { 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 */
 624     { { 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 */
 625     { { 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 */
 626     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
 627 };
 628
 629 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
 630 {
 631     while (uls->id != CODEC_ID_NONE) {
 632         if(!memcmp(uls->uid, *uid, 16))
 633             break;
 634         uls++;
 635     }
 636     return uls;
 637 }
 638
 639 static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)
 640 {
 641     while (uls->type != CODEC_TYPE_DATA) {
 642         if(!memcmp(uls->uid, *uid, 16))
 643             break;
 644         uls++;
 645     }
 646     return uls->type;
 647 }
 648
 649 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
 650 {
 651     int i;
 652
 653     if (!strong_ref)
 654         return NULL;
 655     for (i = 0; i < mxf->metadata_sets_count; i++) {
 656         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
 657             (type == AnyType || mxf->metadata_sets[i]->type == type)) {
 658             return mxf->metadata_sets[i];
 659         }
 660     }
 661     return NULL;
 662 }
 663
 664 static int mxf_parse_structural_metadata(MXFContext *mxf)
 665 {
 666     MXFPackage *material_package = NULL;
 667     MXFPackage *temp_package = NULL;
 668     int i, j, k;
 669
 670     dprintf("metadata sets count %d\n", mxf->metadata_sets_count);
 671     /* TODO: handle multiple material packages (OP3x) */
 672     for (i = 0; i < mxf->packages_count; i++) {
 673         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
 674         if (material_package) break;
 675     }
 676     if (!material_package) {
 677         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
 678         return -1;
 679     }
 680
 681     for (i = 0; i < material_package->tracks_count; i++) {
 682         MXFPackage *source_package = NULL;
 683         MXFTrack *material_track = NULL;
 684         MXFTrack *source_track = NULL;
 685         MXFTrack *temp_track = NULL;
 686         MXFDescriptor *descriptor = NULL;
 687         MXFStructuralComponent *component = NULL;
 688         const MXFCodecUL *codec_ul = NULL;
 689         const MXFCodecUL *container_ul = NULL;
 690         AVStream *st;
 691
 692         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
 693             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
 694             continue;
 695         }
 696
 697         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
 698             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
 699             return -1;
 700         }
 701
 702         /* TODO: handle multiple source clips */
 703         for (j = 0; j < material_track->sequence->structural_components_count; j++) {
 704             /* TODO: handle timecode component */
 705             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
 706             if (!component)
 707                 continue;
 708
 709             for (k = 0; k < mxf->packages_count; k++) {
 710                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
 711                 if (!temp_package)
 712                     continue;
 713                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
 714                     source_package = temp_package;
 715                     break;
 716                 }
 717             }
 718             if (!source_package) {
 719                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
 720                 break;
 721             }
 722             for (k = 0; k < source_package->tracks_count; k++) {
 723                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
 724                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
 725                     return -1;
 726                 }
 727                 if (temp_track->track_id == component->source_track_id) {
 728                     source_track = temp_track;
 729                     break;
 730                 }
 731             }
 732             if (!source_track) {
 733                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
 734                 break;
 735             }
 736         }
 737         if (!source_track)
 738             continue;
 739
 740         st = av_new_stream(mxf->fc, source_track->track_id);
 741         st->priv_data = source_track;
 742         st->duration = component->duration;
 743         if (st->duration == -1)
 744             st->duration = AV_NOPTS_VALUE;
 745         st->start_time = component->start_position;
 746         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
 747
 748         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
 749             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
 750             return -1;
 751         }
 752
 753 #ifdef DEBUG
 754         PRINT_KEY("data definition   ul", source_track->sequence->data_definition_ul);
 755 #endif
 756         st->codec->codec_type = mxf_get_codec_type(mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
 757
 758         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
 759         if (source_package->descriptor) {
 760             if (source_package->descriptor->type == MultipleDescriptor) {
 761                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
 762                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
 763
 764                     if (!sub_descriptor) {
 765                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
 766                         continue;
 767                     }
 768                     if (sub_descriptor->linked_track_id == source_track->track_id) {
 769                         descriptor = sub_descriptor;
 770                         break;
 771                     }
 772                 }
 773             } else if (source_package->descriptor->type == Descriptor)
 774                 descriptor = source_package->descriptor;
 775         }
 776         if (!descriptor) {
 777             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
 778             continue;
 779         }
 780 #ifdef DEBUG
 781         PRINT_KEY("essence codec     ul", descriptor->essence_codec_ul);
 782         PRINT_KEY("essence container ul", descriptor->essence_container_ul);
 783 #endif
 784         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
 785         codec_ul = mxf_get_codec_ul(mxf_codec_uls, &descriptor->essence_codec_ul);
 786         st->codec->codec_id = codec_ul->id;
 787         if (descriptor->extradata) {
 788             st->codec->extradata = descriptor->extradata;
 789             st->codec->extradata_size = descriptor->extradata_size;
 790         }
 791         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 792             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, &descriptor->essence_container_ul);
 793             if (st->codec->codec_id == CODEC_ID_NONE)
 794                 st->codec->codec_id = container_ul->id;
 795             st->codec->width = descriptor->width;
 796             st->codec->height = descriptor->height;
 797             st->codec->bits_per_sample = descriptor->bits_per_sample; /* Uncompressed */
 798             st->need_parsing = 2; /* only parse headers */
 799         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 800             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, &descriptor->essence_container_ul);
 801             if (st->codec->codec_id == CODEC_ID_NONE)
 802                 st->codec->codec_id = container_ul->id;
 803             st->codec->channels = descriptor->channels;
 804             st->codec->bits_per_sample = descriptor->bits_per_sample;
 805             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
 806             /* TODO: implement CODEC_ID_RAWAUDIO */
 807             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
 808                 if (descriptor->bits_per_sample == 24)
 809                     st->codec->codec_id = CODEC_ID_PCM_S24LE;
 810                 else if (descriptor->bits_per_sample == 32)
 811                     st->codec->codec_id = CODEC_ID_PCM_S32LE;
 812             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
 813                 if (descriptor->bits_per_sample == 24)
 814                     st->codec->codec_id = CODEC_ID_PCM_S24BE;
 815                 else if (descriptor->bits_per_sample == 32)
 816                     st->codec->codec_id = CODEC_ID_PCM_S32BE;
 817                 if (descriptor->essence_container_ul[13] == 0x01) /* D-10 Mapping */
 818                     st->codec->channels = 8; /* force channels to 8 */
 819             } else if (st->codec->codec_id == CODEC_ID_MP2) {
 820                 st->need_parsing = 1;
 821             }
 822         }
 823         if (container_ul && container_ul->wrapping == Clip) {
 824             dprintf("stream %d: clip wrapped essence\n", st->index);
 825             st->need_parsing = 1;
 826         }
 827     }
 828     return 0;
 829 }
 830
 831 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
 832     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2F,0x00 }, mxf_read_metadata_preface },
 833     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage },
 834     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package },
 835     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package },
 836     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence },
 837     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip },
 838     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_multiple_descriptor },
 839     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor }, /* Generic Sound */
 840     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor }, /* CDCI */
 841     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor }, /* RGBA */
 842     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor }, /* MPEG 2 Video */
 843     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor }, /* Wave */
 844     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor }, /* AES3 */
 845     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track }, /* Static Track */
 846     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track }, /* Generic Track */
 847     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL },
 848 };
 849
 850 static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
 851 {
 852     int i, b;
 853     for (i = 0; i < size && !url_feof(pb); i++) {
 854         b = get_byte(pb);
 855         if (b == key[0])
 856             i = 0;
 857         else if (b != key[i])
 858             i = -1;
 859     }
 860     return i == size;
 861 }
 862
 863 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 864 {
 865     MXFContext *mxf = s->priv_data;
 866     KLVPacket klv;
 867
 868     mxf->sync_key = mxf_essence_element_key;
 869     if (!mxf_read_sync(&s->pb, mxf_header_partition_pack_key, 14)) {
 870         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
 871         return -1;
 872     }
 873     url_fseek(&s->pb, -14, SEEK_CUR);
 874     mxf->fc = s;
 875     while (!url_feof(&s->pb)) {
 876         const MXFMetadataReadTableEntry *function;
 877
 878         if (klv_read_packet(&klv, &s->pb) < 0) {
 879             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
 880             return -1;
 881         }
 882 #ifdef DEBUG
 883         PRINT_KEY("read header", klv.key);
 884 #endif
 885         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
 886             /* FIXME avoid seek */
 887             url_fseek(&s->pb, klv.offset, SEEK_SET);
 888             break;
 889         }
 890
 891         for (function = mxf_metadata_read_table; function->read; function++) {
 892             if (IS_KLV_KEY(klv.key, function->key)) {
 893                 if (function->read(mxf, &klv) < 0) {
 894                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
 895                     return -1;
 896                 }
 897                 break;
 898             }
 899         }
 900         if (!function->read)
 901             url_fskip(&s->pb, klv.length);
 902     }
 903     return mxf_parse_structural_metadata(mxf);
 904 }
 905
 906 static int mxf_read_close(AVFormatContext *s)
 907 {
 908     MXFContext *mxf = s->priv_data;
 909     int i;
 910
 911     av_freep(&mxf->packages_refs);
 912     av_freep(&mxf->essence_container_data_sets_refs);
 913     av_freep(&mxf->essence_containers_uls);
 914     for (i = 0; i < mxf->metadata_sets_count; i++) {
 915         switch (mxf->metadata_sets[i]->type) {
 916         case MultipleDescriptor:
 917             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
 918             break;
 919         case Sequence:
 920             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
 921             break;
 922         case SourcePackage:
 923         case MaterialPackage:
 924             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
 925             break;
 926         default:
 927             break;
 928         }
 929         av_freep(&mxf->metadata_sets[i]);
 930     }
 931     av_freep(&mxf->metadata_sets);
 932     return 0;
 933 }
 934
 935 static int mxf_probe(AVProbeData *p) {
 936     uint8_t *bufp = p->buf;
 937     uint8_t *end = p->buf + p->buf_size;
 938
 939     if (p->buf_size < sizeof(mxf_header_partition_pack_key))
 940         return 0;
 941
 942     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
 943     end -= sizeof(mxf_header_partition_pack_key);
 944     for (; bufp < end; bufp++) {
 945         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
 946             return AVPROBE_SCORE_MAX;
 947     }
 948     return 0;
 949 }
 950
 951 /* rudimentary binary seek */
 952 /* XXX: use MXF Index */
 953 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
 954 {
 955     MXFContext *mxf = s->priv_data;
 956     AVStream *st = s->streams[stream_index];
 957     int64_t seconds;
 958
 959     if (!s->bit_rate)
 960         return -1;
 961     if (sample_time < 0)
 962         sample_time = 0;
 963     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
 964     url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
 965     if (!mxf_read_sync(&s->pb, mxf->sync_key, 12))
 966         return -1;
 967
 968     /* found KLV key */
 969     url_fseek(&s->pb, -12, SEEK_CUR);
 970     av_update_cur_dts(s, st, sample_time);
 971     return 0;
 972 }
 973
 974 AVInputFormat mxf_demuxer = {
 975     "mxf",
 976     "MXF format",
 977     sizeof(MXFContext),
 978     mxf_probe,
 979     mxf_read_header,
 980     mxf_read_packet,
 981     mxf_read_close,
 982     mxf_read_seek,
 983 };