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     const 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)();
 173     int ctx_size;
 174     enum MXFMetadataSetType type;
 175 } MXFMetadataReadTableEntry;
 176
 177 /* partial keys to match */
 178 static const uint8_t mxf_header_partition_pack_key[]       = { 0x06,0x0e,0x2b,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x02 };
 179 static const uint8_t mxf_essence_element_key[]             = { 0x06,0x0e,0x2b,0x34,0x01,0x02,0x01,0x01,0x0d,0x01,0x03,0x01 };
 180 /* complete keys to match */
 181 static const uint8_t mxf_encrypted_triplet_key[]           = { 0x06,0x0e,0x2b,0x34,0x02,0x04,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x7e,0x01,0x00 };
 182
 183 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
 184
 185 #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, \
 186                              (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])
 187
 188 static int64_t klv_decode_ber_length(ByteIOContext *pb)
 189 {
 190     uint64_t size = get_byte(pb);
 191     if (size & 0x80) { /* long form */
 192         int bytes_num = size & 0x7f;
 193         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
 194         if (bytes_num > 8)
 195             return -1;
 196         size = 0;
 197         while (bytes_num--)
 198             size = size << 8 | get_byte(pb);
 199     }
 200     return size;
 201 }
 202
 203 static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
 204 {
 205     klv->offset = url_ftell(pb);
 206     get_buffer(pb, klv->key, 16);
 207     klv->length = klv_decode_ber_length(pb);
 208     return klv->length == -1 ? -1 : 0;
 209 }
 210
 211 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
 212 {
 213     int i;
 214
 215     for (i = 0; i < s->nb_streams; i++) {
 216         MXFTrack *track = s->streams[i]->priv_data;
 217         /* SMPTE 379M 7.3 */
 218         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
 219             return i;
 220     }
 221     /* return 0 if only one stream, for OP Atom files with 0 as track number */
 222     return s->nb_streams == 1 ? 0 : -1;
 223 }
 224
 225 /* XXX: use AVBitStreamFilter */
 226 static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
 227 {
 228     uint8_t buffer[61444];
 229     uint8_t *buf_ptr, *end_ptr, *data_ptr;
 230
 231     if (length > 61444) /* worst case PAL 1920 samples 8 channels */
 232         return -1;
 233     get_buffer(pb, buffer, length);
 234     av_new_packet(pkt, length);
 235     data_ptr = pkt->data;
 236     end_ptr = buffer + length;
 237     buf_ptr = buffer + 4; /* skip SMPTE 331M header */
 238     for (; buf_ptr < end_ptr; buf_ptr += 4) {
 239         if (st->codec->bits_per_sample == 24) {
 240             data_ptr[0] = (buf_ptr[2] >> 4) | ((buf_ptr[3] & 0x0f) << 4);
 241             data_ptr[1] = (buf_ptr[1] >> 4) | ((buf_ptr[2] & 0x0f) << 4);
 242             data_ptr[2] = (buf_ptr[0] >> 4) | ((buf_ptr[1] & 0x0f) << 4);
 243             data_ptr += 3;
 244         } else {
 245             data_ptr[0] = (buf_ptr[2] >> 4) | ((buf_ptr[3] & 0x0f) << 4);
 246             data_ptr[1] = (buf_ptr[1] >> 4) | ((buf_ptr[2] & 0x0f) << 4);
 247             data_ptr += 2;
 248         }
 249     }
 250     pkt->size = data_ptr - pkt->data;
 251     return 0;
 252 }
 253
 254 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
 255 {
 256     MXFContext *mxf = s->priv_data;
 257     KLVPacket klv;
 258
 259     while (!url_feof(&s->pb)) {
 260         if (klv_read_packet(&klv, &s->pb) < 0) {
 261             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
 262             return -1;
 263         }
 264 #ifdef DEBUG
 265         PRINT_KEY("read packet", klv.key);
 266 #endif
 267         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
 268             mxf->sync_key = mxf_encrypted_triplet_key;
 269             av_log(s, AV_LOG_ERROR, "encrypted triplet not supported\n");
 270             return -1;
 271         }
 272         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
 273             int index = mxf_get_stream_index(s, &klv);
 274             if (index < 0) {
 275                 av_log(s, AV_LOG_ERROR, "error getting stream index\n");
 276                 url_fskip(&s->pb, klv.length);
 277                 return -1;
 278             }
 279             /* check for 8 channels AES3 element */
 280             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
 281                 if (mxf_get_d10_aes3_packet(&s->pb, s->streams[index], pkt, klv.length) < 0) {
 282                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
 283                     return -1;
 284                 }
 285             } else
 286                 av_get_packet(&s->pb, pkt, klv.length);
 287             pkt->stream_index = index;
 288             return 0;
 289         } else
 290             url_fskip(&s->pb, klv.length);
 291     }
 292     return AVERROR_IO;
 293 }
 294
 295 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
 296 {
 297     mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
 298     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
 299     mxf->metadata_sets_count++;
 300     return 0;
 301 }
 302
 303 static int mxf_read_metadata_preface(MXFContext *mxf, ByteIOContext *pb, int tag)
 304 {
 305     switch (tag) {
 306     case 0x3B03:
 307         get_buffer(pb, mxf->content_storage_uid, 16);
 308         break;
 309     case 0x3B09:
 310         get_buffer(pb, mxf->operational_pattern_ul, 16);
 311         break;
 312     case 0x3B0A:
 313         mxf->essence_containers_uls_count = get_be32(pb);
 314         if (mxf->essence_containers_uls_count >= UINT_MAX / sizeof(UID))
 315             return -1;
 316         mxf->essence_containers_uls = av_malloc(mxf->essence_containers_uls_count * sizeof(UID));
 317         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 318         get_buffer(pb, (uint8_t *)mxf->essence_containers_uls, mxf->essence_containers_uls_count * sizeof(UID));
 319         break;
 320     }
 321     return 0;
 322 }
 323
 324 static int mxf_read_metadata_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)
 325 {
 326     switch (tag) {
 327     case 0x1901:
 328         mxf->packages_count = get_be32(pb);
 329         if (mxf->packages_count >= UINT_MAX / sizeof(UID))
 330             return -1;
 331         mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
 332         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 333         get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
 334         break;
 335     case 0x1902:
 336         mxf->essence_container_data_sets_count = get_be32(pb);
 337         if (mxf->essence_container_data_sets_count >= UINT_MAX / sizeof(UID))
 338             return -1;
 339         mxf->essence_container_data_sets_refs = av_malloc(mxf->essence_container_data_sets_count * sizeof(UID));
 340         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 341         get_buffer(pb, (uint8_t *)mxf->essence_container_data_sets_refs, mxf->essence_container_data_sets_count * sizeof(UID));
 342         break;
 343     }
 344     return 0;
 345 }
 346
 347 static int mxf_read_metadata_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)
 348 {
 349     switch(tag) {
 350     case 0x0202:
 351         source_clip->duration = get_be64(pb);
 352         break;
 353     case 0x1201:
 354         source_clip->start_position = get_be64(pb);
 355         break;
 356     case 0x1101:
 357         /* UMID, only get last 16 bytes */
 358         url_fskip(pb, 16);
 359         get_buffer(pb, source_clip->source_package_uid, 16);
 360         break;
 361     case 0x1102:
 362         source_clip->source_track_id = get_be32(pb);
 363         break;
 364     }
 365     return 0;
 366 }
 367
 368 static int mxf_read_metadata_material_package(MXFPackage *package, ByteIOContext *pb, int tag)
 369 {
 370     switch(tag) {
 371     case 0x4403:
 372         package->tracks_count = get_be32(pb);
 373         if (package->tracks_count >= UINT_MAX / sizeof(UID))
 374             return -1;
 375         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
 376         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 377         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
 378         break;
 379     }
 380     return 0;
 381 }
 382
 383 static int mxf_read_metadata_track(MXFTrack *track, ByteIOContext *pb, int tag)
 384 {
 385     switch(tag) {
 386     case 0x4801:
 387         track->track_id = get_be32(pb);
 388         break;
 389     case 0x4804:
 390         get_buffer(pb, track->track_number, 4);
 391         break;
 392     case 0x4B01:
 393         track->edit_rate.den = get_be32(pb);
 394         track->edit_rate.num = get_be32(pb);
 395         break;
 396     case 0x4803:
 397         get_buffer(pb, track->sequence_ref, 16);
 398         break;
 399     }
 400     return 0;
 401 }
 402
 403 static int mxf_read_metadata_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)
 404 {
 405     switch(tag) {
 406     case 0x0202:
 407         sequence->duration = get_be64(pb);
 408         break;
 409     case 0x0201:
 410         get_buffer(pb, sequence->data_definition_ul, 16);
 411         break;
 412     case 0x1001:
 413         sequence->structural_components_count = get_be32(pb);
 414         if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
 415             return -1;
 416         sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
 417         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 418         get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
 419         break;
 420     }
 421     return 0;
 422 }
 423
 424 static int mxf_read_metadata_source_package(MXFPackage *package, ByteIOContext *pb, int tag)
 425 {
 426     switch(tag) {
 427     case 0x4403:
 428         package->tracks_count = get_be32(pb);
 429         if (package->tracks_count >= UINT_MAX / sizeof(UID))
 430             return -1;
 431         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
 432         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 433         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
 434         break;
 435     case 0x4401:
 436         /* UMID, only get last 16 bytes */
 437         url_fskip(pb, 16);
 438         get_buffer(pb, package->package_uid, 16);
 439         break;
 440     case 0x4701:
 441         get_buffer(pb, package->descriptor_ref, 16);
 442         break;
 443     }
 444     return 0;
 445 }
 446
 447 static void mxf_read_metadata_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
 448 {
 449     int code;
 450
 451     do {
 452         code = get_byte(pb);
 453         dprintf("pixel layout: code 0x%x\n", code);
 454         switch (code) {
 455         case 0x52: /* R */
 456             descriptor->bits_per_sample += get_byte(pb);
 457             break;
 458         case 0x47: /* G */
 459             descriptor->bits_per_sample += get_byte(pb);
 460             break;
 461         case 0x42: /* B */
 462             descriptor->bits_per_sample += get_byte(pb);
 463             break;
 464         default:
 465             get_byte(pb);
 466         }
 467     } while (code != 0); /* SMPTE 377M E.2.46 */
 468 }
 469
 470 static int mxf_read_metadata_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size)
 471 {
 472     switch(tag) {
 473     case 0x3F01:
 474         descriptor->sub_descriptors_count = get_be32(pb);
 475         if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
 476             return -1;
 477         descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
 478         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 479         get_buffer(pb, (uint8_t *)descriptor->sub_descriptors_refs, descriptor->sub_descriptors_count * sizeof(UID));
 480         break;
 481     case 0x3004:
 482         get_buffer(pb, descriptor->essence_container_ul, 16);
 483         break;
 484     case 0x3006:
 485         descriptor->linked_track_id = get_be32(pb);
 486         break;
 487     case 0x3201: /* PictureEssenceCoding */
 488         get_buffer(pb, descriptor->essence_codec_ul, 16);
 489         break;
 490     case 0x3203:
 491         descriptor->width = get_be32(pb);
 492         break;
 493     case 0x3202:
 494         descriptor->height = get_be32(pb);
 495         break;
 496     case 0x320E:
 497         descriptor->aspect_ratio.num = get_be32(pb);
 498         descriptor->aspect_ratio.den = get_be32(pb);
 499         break;
 500     case 0x3D03:
 501         descriptor->sample_rate.num = get_be32(pb);
 502         descriptor->sample_rate.den = get_be32(pb);
 503         break;
 504     case 0x3D06: /* SoundEssenceCompression */
 505         get_buffer(pb, descriptor->essence_codec_ul, 16);
 506         break;
 507     case 0x3D07:
 508         descriptor->channels = get_be32(pb);
 509         break;
 510     case 0x3D01:
 511         descriptor->bits_per_sample = get_be32(pb);
 512         break;
 513     case 0x3401:
 514         mxf_read_metadata_pixel_layout(pb, descriptor);
 515         break;
 516     case 0x8201: /* Private tag used by SONY C0023S01.mxf */
 517         descriptor->extradata = av_malloc(size);
 518         descriptor->extradata_size = size;
 519         get_buffer(pb, descriptor->extradata, size);
 520         break;
 521     }
 522     return 0;
 523 }
 524
 525 /* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */
 526 static const MXFDataDefinitionUL mxf_data_definition_uls[] = {
 527     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },
 528     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },
 529     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },
 530     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },
 531 };
 532
 533 static const MXFCodecUL mxf_codec_uls[] = {
 534     /* PictureEssenceCoding */
 535     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML I-Frame */
 536     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL I-Frame */
 537     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@HL Long GoP */
 538     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@ML Long GoP */
 539     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x02,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* 422P@ML Long GoP */
 540     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MP@HL Long GoP */
 541     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 },      CODEC_ID_MPEG4, Frame }, /* XDCAM proxy_pal030926.mxf */
 542     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x04 },      CODEC_ID_MPEG4, Frame }, /* XDCAM Proxy C0023S01.mxf */
 543     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x05 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 30Mbps PAL */
 544     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* D-10 50Mbps PAL */
 545     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x04,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO50 PAL */
 546     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x02,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DVCPRO25 PAL */
 547     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 },    CODEC_ID_DVVIDEO, Frame }, /* DV25 IEC PAL */
 548     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_JPEG2000, Frame }, /* JPEG2000 Codestream */
 549     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 },   CODEC_ID_RAWVIDEO, Frame }, /* Uncompressed */
 550     /* SoundEssenceCompression */
 551     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* Uncompressed */
 552     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 },  CODEC_ID_PCM_S16LE, Frame },
 553     { { 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 */
 554     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 },   CODEC_ID_PCM_ALAW, Frame },
 555     { { 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 */
 556     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 },        CODEC_ID_AC3, Frame },
 557     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 },        CODEC_ID_MP2, Frame }, /* MP2 or MP3 */
 558   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 },    CODEC_ID_DOLBY_E, Frame }, /* Dolby-E */
 559     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
 560 };
 561
 562 static const MXFCodecUL mxf_picture_essence_container_uls[] = {
 563     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, CODEC_ID_MPEG2VIDEO, Frame }, /* MPEG-ES Frame wrapped */
 564     { { 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 */
 565     { { 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 */
 566     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
 567 };
 568
 569 static const MXFCodecUL mxf_sound_essence_container_uls[] = {
 570     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* BWF Frame wrapped */
 571     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x03,0x00 },  CODEC_ID_PCM_S16LE, Frame }, /* AES Frame wrapped */
 572     { { 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 */
 573     { { 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 */
 574     { { 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 */
 575     { { 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 */
 576     { { 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 */
 577     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },       CODEC_ID_NONE, Frame },
 578 };
 579
 580 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
 581 {
 582     while (uls->id != CODEC_ID_NONE) {
 583         if(!memcmp(uls->uid, *uid, 16))
 584             break;
 585         uls++;
 586     }
 587     return uls;
 588 }
 589
 590 static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)
 591 {
 592     while (uls->type != CODEC_TYPE_DATA) {
 593         if(!memcmp(uls->uid, *uid, 16))
 594             break;
 595         uls++;
 596     }
 597     return uls->type;
 598 }
 599
 600 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
 601 {
 602     int i;
 603
 604     if (!strong_ref)
 605         return NULL;
 606     for (i = 0; i < mxf->metadata_sets_count; i++) {
 607         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
 608             (type == AnyType || mxf->metadata_sets[i]->type == type)) {
 609             return mxf->metadata_sets[i];
 610         }
 611     }
 612     return NULL;
 613 }
 614
 615 static int mxf_parse_structural_metadata(MXFContext *mxf)
 616 {
 617     MXFPackage *material_package = NULL;
 618     MXFPackage *temp_package = NULL;
 619     int i, j, k;
 620
 621     dprintf("metadata sets count %d\n", mxf->metadata_sets_count);
 622     /* TODO: handle multiple material packages (OP3x) */
 623     for (i = 0; i < mxf->packages_count; i++) {
 624         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
 625         if (material_package) break;
 626     }
 627     if (!material_package) {
 628         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
 629         return -1;
 630     }
 631
 632     for (i = 0; i < material_package->tracks_count; i++) {
 633         MXFPackage *source_package = NULL;
 634         MXFTrack *material_track = NULL;
 635         MXFTrack *source_track = NULL;
 636         MXFTrack *temp_track = NULL;
 637         MXFDescriptor *descriptor = NULL;
 638         MXFStructuralComponent *component = NULL;
 639         const MXFCodecUL *codec_ul = NULL;
 640         const MXFCodecUL *container_ul = NULL;
 641         AVStream *st;
 642
 643         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
 644             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
 645             continue;
 646         }
 647
 648         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
 649             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
 650             return -1;
 651         }
 652
 653         /* TODO: handle multiple source clips */
 654         for (j = 0; j < material_track->sequence->structural_components_count; j++) {
 655             /* TODO: handle timecode component */
 656             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
 657             if (!component)
 658                 continue;
 659
 660             for (k = 0; k < mxf->packages_count; k++) {
 661                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
 662                 if (!temp_package)
 663                     continue;
 664                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
 665                     source_package = temp_package;
 666                     break;
 667                 }
 668             }
 669             if (!source_package) {
 670                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
 671                 break;
 672             }
 673             for (k = 0; k < source_package->tracks_count; k++) {
 674                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
 675                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
 676                     return -1;
 677                 }
 678                 if (temp_track->track_id == component->source_track_id) {
 679                     source_track = temp_track;
 680                     break;
 681                 }
 682             }
 683             if (!source_track) {
 684                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
 685                 break;
 686             }
 687         }
 688         if (!source_track)
 689             continue;
 690
 691         st = av_new_stream(mxf->fc, source_track->track_id);
 692         st->priv_data = source_track;
 693         st->duration = component->duration;
 694         if (st->duration == -1)
 695             st->duration = AV_NOPTS_VALUE;
 696         st->start_time = component->start_position;
 697         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
 698
 699         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
 700             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
 701             return -1;
 702         }
 703
 704 #ifdef DEBUG
 705         PRINT_KEY("data definition   ul", source_track->sequence->data_definition_ul);
 706 #endif
 707         st->codec->codec_type = mxf_get_codec_type(mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
 708
 709         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
 710         if (source_package->descriptor) {
 711             if (source_package->descriptor->type == MultipleDescriptor) {
 712                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
 713                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
 714
 715                     if (!sub_descriptor) {
 716                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
 717                         continue;
 718                     }
 719                     if (sub_descriptor->linked_track_id == source_track->track_id) {
 720                         descriptor = sub_descriptor;
 721                         break;
 722                     }
 723                 }
 724             } else if (source_package->descriptor->type == Descriptor)
 725                 descriptor = source_package->descriptor;
 726         }
 727         if (!descriptor) {
 728             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
 729             continue;
 730         }
 731 #ifdef DEBUG
 732         PRINT_KEY("essence codec     ul", descriptor->essence_codec_ul);
 733         PRINT_KEY("essence container ul", descriptor->essence_container_ul);
 734 #endif
 735         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
 736         codec_ul = mxf_get_codec_ul(mxf_codec_uls, &descriptor->essence_codec_ul);
 737         st->codec->codec_id = codec_ul->id;
 738         if (descriptor->extradata) {
 739             st->codec->extradata = descriptor->extradata;
 740             st->codec->extradata_size = descriptor->extradata_size;
 741         }
 742         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 743             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, &descriptor->essence_container_ul);
 744             if (st->codec->codec_id == CODEC_ID_NONE)
 745                 st->codec->codec_id = container_ul->id;
 746             st->codec->width = descriptor->width;
 747             st->codec->height = descriptor->height;
 748             st->codec->bits_per_sample = descriptor->bits_per_sample; /* Uncompressed */
 749             st->need_parsing = 2; /* only parse headers */
 750         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 751             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, &descriptor->essence_container_ul);
 752             if (st->codec->codec_id == CODEC_ID_NONE)
 753                 st->codec->codec_id = container_ul->id;
 754             st->codec->channels = descriptor->channels;
 755             st->codec->bits_per_sample = descriptor->bits_per_sample;
 756             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
 757             /* TODO: implement CODEC_ID_RAWAUDIO */
 758             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
 759                 if (descriptor->bits_per_sample == 24)
 760                     st->codec->codec_id = CODEC_ID_PCM_S24LE;
 761                 else if (descriptor->bits_per_sample == 32)
 762                     st->codec->codec_id = CODEC_ID_PCM_S32LE;
 763             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
 764                 if (descriptor->bits_per_sample == 24)
 765                     st->codec->codec_id = CODEC_ID_PCM_S24BE;
 766                 else if (descriptor->bits_per_sample == 32)
 767                     st->codec->codec_id = CODEC_ID_PCM_S32BE;
 768                 if (descriptor->essence_container_ul[13] == 0x01) /* D-10 Mapping */
 769                     st->codec->channels = 8; /* force channels to 8 */
 770             } else if (st->codec->codec_id == CODEC_ID_MP2) {
 771                 st->need_parsing = 1;
 772             }
 773         }
 774         if (container_ul && container_ul->wrapping == Clip) {
 775             dprintf("stream %d: clip wrapped essence\n", st->index);
 776             st->need_parsing = 1;
 777         }
 778     }
 779     return 0;
 780 }
 781
 782 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
 783     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x2F,0x00 }, mxf_read_metadata_preface, 0, AnyType },
 784     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_metadata_content_storage, 0, AnyType },
 785     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_metadata_source_package, sizeof(MXFPackage), SourcePackage },
 786     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_metadata_material_package, sizeof(MXFPackage), MaterialPackage },
 787     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_metadata_sequence, sizeof(MXFSequence), Sequence },
 788     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_metadata_source_clip, sizeof(MXFStructuralComponent), SourceClip },
 789     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
 790     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */
 791     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
 792     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
 793     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */
 794     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
 795     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_metadata_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
 796     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_metadata_track, sizeof(MXFTrack), Track }, /* Static Track */
 797     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_metadata_track, sizeof(MXFTrack), Track }, /* Generic Track */
 798     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
 799 };
 800
 801 static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
 802 {
 803     int i, b;
 804     for (i = 0; i < size && !url_feof(pb); i++) {
 805         b = get_byte(pb);
 806         if (b == key[0])
 807             i = 0;
 808         else if (b != key[i])
 809             i = -1;
 810     }
 811     return i == size;
 812 }
 813
 814 static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type)
 815 {
 816     ByteIOContext *pb = &mxf->fc->pb;
 817     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
 818     uint64_t klv_end= url_ftell(pb) + klv->length;
 819
 820     while (url_ftell(pb) + 4 < klv_end) {
 821         int tag = get_be16(pb);
 822         int size = get_be16(pb); /* KLV specified by 0x53 */
 823         uint64_t next= url_ftell(pb) + size;
 824
 825         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
 826             av_log(mxf->fc, AV_LOG_ERROR, "local tag 0x%04X with 0 size\n", tag);
 827             continue;
 828         }
 829         if(ctx_size && tag == 0x3C0A)
 830             get_buffer(pb, ctx->uid, 16);
 831         else
 832             read_child(ctx, pb, tag, size);
 833
 834         url_fseek(pb, next, SEEK_SET);
 835     }
 836     if (ctx_size) ctx->type = type;
 837     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
 838 }
 839
 840 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 841 {
 842     MXFContext *mxf = s->priv_data;
 843     KLVPacket klv;
 844
 845     mxf->sync_key = mxf_essence_element_key;
 846     if (!mxf_read_sync(&s->pb, mxf_header_partition_pack_key, 14)) {
 847         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
 848         return -1;
 849     }
 850     url_fseek(&s->pb, -14, SEEK_CUR);
 851     mxf->fc = s;
 852     while (!url_feof(&s->pb)) {
 853         const MXFMetadataReadTableEntry *function;
 854
 855         if (klv_read_packet(&klv, &s->pb) < 0) {
 856             av_log(s, AV_LOG_ERROR, "error reading KLV packet\n");
 857             return -1;
 858         }
 859 #ifdef DEBUG
 860         PRINT_KEY("read header", klv.key);
 861 #endif
 862         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
 863             /* FIXME avoid seek */
 864             url_fseek(&s->pb, klv.offset, SEEK_SET);
 865             break;
 866         }
 867
 868         for (function = mxf_metadata_read_table; function->read; function++) {
 869             if (IS_KLV_KEY(klv.key, function->key)) {
 870                 if (mxf_read_local_tags(mxf, &klv, function->read, function->ctx_size, function->type) < 0) {
 871                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
 872                     return -1;
 873                 }
 874                 break;
 875             }
 876         }
 877         if (!function->read)
 878             url_fskip(&s->pb, klv.length);
 879     }
 880     return mxf_parse_structural_metadata(mxf);
 881 }
 882
 883 static int mxf_read_close(AVFormatContext *s)
 884 {
 885     MXFContext *mxf = s->priv_data;
 886     int i;
 887
 888     av_freep(&mxf->packages_refs);
 889     av_freep(&mxf->essence_container_data_sets_refs);
 890     av_freep(&mxf->essence_containers_uls);
 891     for (i = 0; i < mxf->metadata_sets_count; i++) {
 892         switch (mxf->metadata_sets[i]->type) {
 893         case MultipleDescriptor:
 894             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
 895             break;
 896         case Sequence:
 897             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
 898             break;
 899         case SourcePackage:
 900         case MaterialPackage:
 901             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
 902             break;
 903         default:
 904             break;
 905         }
 906         av_freep(&mxf->metadata_sets[i]);
 907     }
 908     av_freep(&mxf->metadata_sets);
 909     return 0;
 910 }
 911
 912 static int mxf_probe(AVProbeData *p) {
 913     uint8_t *bufp = p->buf;
 914     uint8_t *end = p->buf + p->buf_size;
 915
 916     if (p->buf_size < sizeof(mxf_header_partition_pack_key))
 917         return 0;
 918
 919     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
 920     end -= sizeof(mxf_header_partition_pack_key);
 921     for (; bufp < end; bufp++) {
 922         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
 923             return AVPROBE_SCORE_MAX;
 924     }
 925     return 0;
 926 }
 927
 928 /* rudimentary binary seek */
 929 /* XXX: use MXF Index */
 930 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
 931 {
 932     MXFContext *mxf = s->priv_data;
 933     AVStream *st = s->streams[stream_index];
 934     int64_t seconds;
 935
 936     if (!s->bit_rate)
 937         return -1;
 938     if (sample_time < 0)
 939         sample_time = 0;
 940     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
 941     url_fseek(&s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
 942     if (!mxf_read_sync(&s->pb, mxf->sync_key, 12))
 943         return -1;
 944
 945     /* found KLV key */
 946     url_fseek(&s->pb, -12, SEEK_CUR);
 947     av_update_cur_dts(s, st, sample_time);
 948     return 0;
 949 }
 950
 951 AVInputFormat mxf_demuxer = {
 952     "mxf",
 953     "MXF format",
 954     sizeof(MXFContext),
 955     mxf_probe,
 956     mxf_read_header,
 957     mxf_read_packet,
 958     mxf_read_close,
 959     mxf_read_seek,
 960 };