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 "libavutil/aes.h"
  49 #include "libavcodec/bytestream.h"
  50 #include "avformat.h"
  51
  52 typedef uint8_t UID[16];
  53
  54 enum MXFMetadataSetType {
  55     AnyType,
  56     MaterialPackage,
  57     SourcePackage,
  58     SourceClip,
  59     TimecodeComponent,
  60     Sequence,
  61     MultipleDescriptor,
  62     Descriptor,
  63     Track,
  64     CryptoContext,
  65 };
  66
  67 typedef struct {
  68     UID uid;
  69     enum MXFMetadataSetType type;
  70     UID source_container_ul;
  71 } MXFCryptoContext;
  72
  73 typedef struct {
  74     UID uid;
  75     enum MXFMetadataSetType type;
  76     UID source_package_uid;
  77     UID data_definition_ul;
  78     int64_t duration;
  79     int64_t start_position;
  80     int source_track_id;
  81 } MXFStructuralComponent;
  82
  83 typedef struct {
  84     UID uid;
  85     enum MXFMetadataSetType type;
  86     UID data_definition_ul;
  87     UID *structural_components_refs;
  88     int structural_components_count;
  89     int64_t duration;
  90 } MXFSequence;
  91
  92 typedef struct {
  93     UID uid;
  94     enum MXFMetadataSetType type;
  95     MXFSequence *sequence; /* mandatory, and only one */
  96     UID sequence_ref;
  97     int track_id;
  98     uint8_t track_number[4];
  99     AVRational edit_rate;
 100 } MXFTrack;
 101
 102 typedef struct {
 103     UID uid;
 104     enum MXFMetadataSetType type;
 105     UID essence_container_ul;
 106     UID essence_codec_ul;
 107     AVRational sample_rate;
 108     AVRational aspect_ratio;
 109     int width;
 110     int height;
 111     int channels;
 112     int bits_per_sample;
 113     UID *sub_descriptors_refs;
 114     int sub_descriptors_count;
 115     int linked_track_id;
 116     uint8_t *extradata;
 117     int extradata_size;
 118 } MXFDescriptor;
 119
 120 typedef struct {
 121     UID uid;
 122     enum MXFMetadataSetType type;
 123     UID package_uid;
 124     UID *tracks_refs;
 125     int tracks_count;
 126     MXFDescriptor *descriptor; /* only one */
 127     UID descriptor_ref;
 128 } MXFPackage;
 129
 130 typedef struct {
 131     UID uid;
 132     enum MXFMetadataSetType type;
 133 } MXFMetadataSet;
 134
 135 typedef struct {
 136     UID *packages_refs;
 137     int packages_count;
 138     MXFMetadataSet **metadata_sets;
 139     int metadata_sets_count;
 140     AVFormatContext *fc;
 141     struct AVAES *aesc;
 142     uint8_t *local_tags;
 143     int local_tags_count;
 144 } MXFContext;
 145
 146 typedef struct {
 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 {
 158     UID uid;
 159     unsigned matching_len;
 160     enum CodecID id;
 161 } MXFCodecUL;
 162
 163 typedef struct {
 164     UID uid;
 165     enum CodecType type;
 166 } MXFDataDefinitionUL;
 167
 168 typedef struct {
 169     const UID key;
 170     int (*read)();
 171     int ctx_size;
 172     enum MXFMetadataSetType type;
 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 static const uint8_t mxf_klv_key[]                         = { 0x06,0x0e,0x2b,0x34 };
 179 /* complete keys to match */
 180 static const uint8_t mxf_crypto_source_container_ul[]      = { 0x06,0x0e,0x2b,0x34,0x01,0x01,0x01,0x09,0x06,0x01,0x01,0x02,0x02,0x00,0x00,0x00 };
 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 static const uint8_t mxf_encrypted_essence_container[]     = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x07,0x0d,0x01,0x03,0x01,0x02,0x0b,0x01,0x00 };
 183 static const uint8_t mxf_sony_mpeg4_extradata[]            = { 0x06,0x0e,0x2b,0x34,0x04,0x01,0x01,0x01,0x0e,0x06,0x06,0x02,0x02,0x01,0x00,0x00 };
 184
 185 #define IS_KLV_KEY(x, y) (!memcmp(x, y, sizeof(y)))
 186
 187 #define PRINT_KEY(pc, s, x) dprintf(pc, "%s %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X %02X\n", s, \
 188                              (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])
 189
 190 static int64_t klv_decode_ber_length(ByteIOContext *pb)
 191 {
 192     uint64_t size = get_byte(pb);
 193     if (size & 0x80) { /* long form */
 194         int bytes_num = size & 0x7f;
 195         /* SMPTE 379M 5.3.4 guarantee that bytes_num must not exceed 8 bytes */
 196         if (bytes_num > 8)
 197             return -1;
 198         size = 0;
 199         while (bytes_num--)
 200             size = size << 8 | get_byte(pb);
 201     }
 202     return size;
 203 }
 204
 205 static int mxf_read_sync(ByteIOContext *pb, const uint8_t *key, unsigned size)
 206 {
 207     int i, b;
 208     for (i = 0; i < size && !url_feof(pb); i++) {
 209         b = get_byte(pb);
 210         if (b == key[0])
 211             i = 0;
 212         else if (b != key[i])
 213             i = -1;
 214     }
 215     return i == size;
 216 }
 217
 218 static int klv_read_packet(KLVPacket *klv, ByteIOContext *pb)
 219 {
 220     if (!mxf_read_sync(pb, mxf_klv_key, 4))
 221         return -1;
 222     klv->offset = url_ftell(pb) - 4;
 223     memcpy(klv->key, mxf_klv_key, 4);
 224     get_buffer(pb, klv->key + 4, 12);
 225     klv->length = klv_decode_ber_length(pb);
 226     return klv->length == -1 ? -1 : 0;
 227 }
 228
 229 static int mxf_get_stream_index(AVFormatContext *s, KLVPacket *klv)
 230 {
 231     int i;
 232
 233     for (i = 0; i < s->nb_streams; i++) {
 234         MXFTrack *track = s->streams[i]->priv_data;
 235         /* SMPTE 379M 7.3 */
 236         if (!memcmp(klv->key + sizeof(mxf_essence_element_key), track->track_number, sizeof(track->track_number)))
 237             return i;
 238     }
 239     /* return 0 if only one stream, for OP Atom files with 0 as track number */
 240     return s->nb_streams == 1 ? 0 : -1;
 241 }
 242
 243 /* XXX: use AVBitStreamFilter */
 244 static int mxf_get_d10_aes3_packet(ByteIOContext *pb, AVStream *st, AVPacket *pkt, int64_t length)
 245 {
 246     uint8_t buffer[61444];
 247     const uint8_t *buf_ptr, *end_ptr;
 248     uint8_t *data_ptr;
 249     int i;
 250
 251     if (length > 61444) /* worst case PAL 1920 samples 8 channels */
 252         return -1;
 253     get_buffer(pb, buffer, length);
 254     av_new_packet(pkt, length);
 255     data_ptr = pkt->data;
 256     end_ptr = buffer + length;
 257     buf_ptr = buffer + 4; /* skip SMPTE 331M header */
 258     for (; buf_ptr < end_ptr; ) {
 259         for (i = 0; i < st->codec->channels; i++) {
 260             uint32_t sample = bytestream_get_le32(&buf_ptr);
 261             if (st->codec->bits_per_sample == 24)
 262                 bytestream_put_le24(&data_ptr, (sample >> 4) & 0xffffff);
 263             else
 264                 bytestream_put_le16(&data_ptr, (sample >> 12) & 0xffff);
 265         }
 266         buf_ptr += 32 - st->codec->channels*4; // always 8 channels stored SMPTE 331M
 267     }
 268     pkt->size = data_ptr - pkt->data;
 269     return 0;
 270 }
 271
 272 static int mxf_decrypt_triplet(AVFormatContext *s, AVPacket *pkt, KLVPacket *klv)
 273 {
 274     static const uint8_t checkv[16] = {0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b, 0x43, 0x48, 0x55, 0x4b};
 275     MXFContext *mxf = s->priv_data;
 276     ByteIOContext *pb = s->pb;
 277     offset_t end = url_ftell(pb) + klv->length;
 278     uint64_t size;
 279     uint64_t orig_size;
 280     uint64_t plaintext_size;
 281     uint8_t ivec[16];
 282     uint8_t tmpbuf[16];
 283     int index;
 284
 285     if (!mxf->aesc && s->key && s->keylen == 16) {
 286         mxf->aesc = av_malloc(av_aes_size);
 287         if (!mxf->aesc)
 288             return -1;
 289         av_aes_init(mxf->aesc, s->key, 128, 1);
 290     }
 291     // crypto context
 292     url_fskip(pb, klv_decode_ber_length(pb));
 293     // plaintext offset
 294     klv_decode_ber_length(pb);
 295     plaintext_size = get_be64(pb);
 296     // source klv key
 297     klv_decode_ber_length(pb);
 298     get_buffer(pb, klv->key, 16);
 299     if (!IS_KLV_KEY(klv, mxf_essence_element_key))
 300         return -1;
 301     index = mxf_get_stream_index(s, klv);
 302     if (index < 0)
 303         return -1;
 304     // source size
 305     klv_decode_ber_length(pb);
 306     orig_size = get_be64(pb);
 307     if (orig_size < plaintext_size)
 308         return -1;
 309     // enc. code
 310     size = klv_decode_ber_length(pb);
 311     if (size < 32 || size - 32 < orig_size)
 312         return -1;
 313     get_buffer(pb, ivec, 16);
 314     get_buffer(pb, tmpbuf, 16);
 315     if (mxf->aesc)
 316         av_aes_crypt(mxf->aesc, tmpbuf, tmpbuf, 1, ivec, 1);
 317     if (memcmp(tmpbuf, checkv, 16))
 318         av_log(s, AV_LOG_ERROR, "probably incorrect decryption key\n");
 319     size -= 32;
 320     av_get_packet(pb, pkt, size);
 321     size -= plaintext_size;
 322     if (mxf->aesc)
 323         av_aes_crypt(mxf->aesc, &pkt->data[plaintext_size],
 324                      &pkt->data[plaintext_size], size >> 4, ivec, 1);
 325     pkt->size = orig_size;
 326     pkt->stream_index = index;
 327     url_fskip(pb, end - url_ftell(pb));
 328     return 0;
 329 }
 330
 331 static int mxf_read_packet(AVFormatContext *s, AVPacket *pkt)
 332 {
 333     KLVPacket klv;
 334
 335     while (!url_feof(s->pb)) {
 336         if (klv_read_packet(&klv, s->pb) < 0)
 337             return -1;
 338 #ifdef DEBUG
 339         PRINT_KEY(s, "read packet", klv.key);
 340 #endif
 341         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {
 342             int res = mxf_decrypt_triplet(s, pkt, &klv);
 343             if (res < 0) {
 344                 av_log(s, AV_LOG_ERROR, "invalid encoded triplet\n");
 345                 return -1;
 346             }
 347             return 0;
 348         }
 349         if (IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
 350             int index = mxf_get_stream_index(s, &klv);
 351             if (index < 0) {
 352                 av_log(s, AV_LOG_ERROR, "error getting stream index %x\n", AV_RB32(klv.key+12));
 353                 goto skip;
 354             }
 355             if (s->streams[index]->discard == AVDISCARD_ALL)
 356                 goto skip;
 357             /* check for 8 channels AES3 element */
 358             if (klv.key[12] == 0x06 && klv.key[13] == 0x01 && klv.key[14] == 0x10) {
 359                 if (mxf_get_d10_aes3_packet(s->pb, s->streams[index], pkt, klv.length) < 0) {
 360                     av_log(s, AV_LOG_ERROR, "error reading D-10 aes3 frame\n");
 361                     return -1;
 362                 }
 363             } else
 364                 av_get_packet(s->pb, pkt, klv.length);
 365             pkt->stream_index = index;
 366             pkt->pos = klv.offset;
 367             return 0;
 368         } else
 369         skip:
 370             url_fskip(s->pb, klv.length);
 371     }
 372     return AVERROR(EIO);
 373 }
 374
 375 static int mxf_read_primer_pack(MXFContext *mxf)
 376 {
 377     ByteIOContext *pb = mxf->fc->pb;
 378     int item_num = get_be32(pb);
 379     int item_len = get_be32(pb);
 380
 381     if (item_len != 18) {
 382         av_log(mxf->fc, AV_LOG_ERROR, "unsupported primer pack item length\n");
 383         return -1;
 384     }
 385     if (item_num > UINT_MAX / item_len)
 386         return -1;
 387     mxf->local_tags_count = item_num;
 388     mxf->local_tags = av_malloc(item_num*item_len);
 389     if (!mxf->local_tags)
 390         return -1;
 391     get_buffer(pb, mxf->local_tags, item_num*item_len);
 392     return 0;
 393 }
 394
 395 static int mxf_add_metadata_set(MXFContext *mxf, void *metadata_set)
 396 {
 397     mxf->metadata_sets = av_realloc(mxf->metadata_sets, (mxf->metadata_sets_count + 1) * sizeof(*mxf->metadata_sets));
 398     if (!mxf->metadata_sets)
 399         return -1;
 400     mxf->metadata_sets[mxf->metadata_sets_count] = metadata_set;
 401     mxf->metadata_sets_count++;
 402     return 0;
 403 }
 404
 405 static int mxf_read_cryptographic_context(MXFCryptoContext *cryptocontext, ByteIOContext *pb, int tag, int size, UID uid)
 406 {
 407     if (size != 16)
 408         return -1;
 409     if (IS_KLV_KEY(uid, mxf_crypto_source_container_ul))
 410         get_buffer(pb, cryptocontext->source_container_ul, 16);
 411     return 0;
 412 }
 413
 414 static int mxf_read_content_storage(MXFContext *mxf, ByteIOContext *pb, int tag)
 415 {
 416     switch (tag) {
 417     case 0x1901:
 418         mxf->packages_count = get_be32(pb);
 419         if (mxf->packages_count >= UINT_MAX / sizeof(UID))
 420             return -1;
 421         mxf->packages_refs = av_malloc(mxf->packages_count * sizeof(UID));
 422         if (!mxf->packages_refs)
 423             return -1;
 424         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 425         get_buffer(pb, (uint8_t *)mxf->packages_refs, mxf->packages_count * sizeof(UID));
 426         break;
 427     }
 428     return 0;
 429 }
 430
 431 static int mxf_read_source_clip(MXFStructuralComponent *source_clip, ByteIOContext *pb, int tag)
 432 {
 433     switch(tag) {
 434     case 0x0202:
 435         source_clip->duration = get_be64(pb);
 436         break;
 437     case 0x1201:
 438         source_clip->start_position = get_be64(pb);
 439         break;
 440     case 0x1101:
 441         /* UMID, only get last 16 bytes */
 442         url_fskip(pb, 16);
 443         get_buffer(pb, source_clip->source_package_uid, 16);
 444         break;
 445     case 0x1102:
 446         source_clip->source_track_id = get_be32(pb);
 447         break;
 448     }
 449     return 0;
 450 }
 451
 452 static int mxf_read_material_package(MXFPackage *package, ByteIOContext *pb, int tag)
 453 {
 454     switch(tag) {
 455     case 0x4403:
 456         package->tracks_count = get_be32(pb);
 457         if (package->tracks_count >= UINT_MAX / sizeof(UID))
 458             return -1;
 459         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
 460         if (!package->tracks_refs)
 461             return -1;
 462         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 463         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
 464         break;
 465     }
 466     return 0;
 467 }
 468
 469 static int mxf_read_track(MXFTrack *track, ByteIOContext *pb, int tag)
 470 {
 471     switch(tag) {
 472     case 0x4801:
 473         track->track_id = get_be32(pb);
 474         break;
 475     case 0x4804:
 476         get_buffer(pb, track->track_number, 4);
 477         break;
 478     case 0x4B01:
 479         track->edit_rate.den = get_be32(pb);
 480         track->edit_rate.num = get_be32(pb);
 481         break;
 482     case 0x4803:
 483         get_buffer(pb, track->sequence_ref, 16);
 484         break;
 485     }
 486     return 0;
 487 }
 488
 489 static int mxf_read_sequence(MXFSequence *sequence, ByteIOContext *pb, int tag)
 490 {
 491     switch(tag) {
 492     case 0x0202:
 493         sequence->duration = get_be64(pb);
 494         break;
 495     case 0x0201:
 496         get_buffer(pb, sequence->data_definition_ul, 16);
 497         break;
 498     case 0x1001:
 499         sequence->structural_components_count = get_be32(pb);
 500         if (sequence->structural_components_count >= UINT_MAX / sizeof(UID))
 501             return -1;
 502         sequence->structural_components_refs = av_malloc(sequence->structural_components_count * sizeof(UID));
 503         if (!sequence->structural_components_refs)
 504             return -1;
 505         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 506         get_buffer(pb, (uint8_t *)sequence->structural_components_refs, sequence->structural_components_count * sizeof(UID));
 507         break;
 508     }
 509     return 0;
 510 }
 511
 512 static int mxf_read_source_package(MXFPackage *package, ByteIOContext *pb, int tag)
 513 {
 514     switch(tag) {
 515     case 0x4403:
 516         package->tracks_count = get_be32(pb);
 517         if (package->tracks_count >= UINT_MAX / sizeof(UID))
 518             return -1;
 519         package->tracks_refs = av_malloc(package->tracks_count * sizeof(UID));
 520         if (!package->tracks_refs)
 521             return -1;
 522         url_fskip(pb, 4); /* useless size of objects, always 16 according to specs */
 523         get_buffer(pb, (uint8_t *)package->tracks_refs, package->tracks_count * sizeof(UID));
 524         break;
 525     case 0x4401:
 526         /* UMID, only get last 16 bytes */
 527         url_fskip(pb, 16);
 528         get_buffer(pb, package->package_uid, 16);
 529         break;
 530     case 0x4701:
 531         get_buffer(pb, package->descriptor_ref, 16);
 532         break;
 533     }
 534     return 0;
 535 }
 536
 537 static void mxf_read_pixel_layout(ByteIOContext *pb, MXFDescriptor *descriptor)
 538 {
 539     int code;
 540
 541     do {
 542         code = get_byte(pb);
 543         dprintf(NULL, "pixel layout: code 0x%x\n", code);
 544         switch (code) {
 545         case 0x52: /* R */
 546             descriptor->bits_per_sample += get_byte(pb);
 547             break;
 548         case 0x47: /* G */
 549             descriptor->bits_per_sample += get_byte(pb);
 550             break;
 551         case 0x42: /* B */
 552             descriptor->bits_per_sample += get_byte(pb);
 553             break;
 554         default:
 555             get_byte(pb);
 556         }
 557     } while (code != 0); /* SMPTE 377M E.2.46 */
 558 }
 559
 560 static int mxf_read_generic_descriptor(MXFDescriptor *descriptor, ByteIOContext *pb, int tag, int size, UID uid)
 561 {
 562     switch(tag) {
 563     case 0x3F01:
 564         descriptor->sub_descriptors_count = get_be32(pb);
 565         if (descriptor->sub_descriptors_count >= UINT_MAX / sizeof(UID))
 566             return -1;
 567         descriptor->sub_descriptors_refs = av_malloc(descriptor->sub_descriptors_count * sizeof(UID));
 568         if (!descriptor->sub_descriptors_refs)
 569             return -1;
 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     case 0x3004:
 574         get_buffer(pb, descriptor->essence_container_ul, 16);
 575         break;
 576     case 0x3006:
 577         descriptor->linked_track_id = get_be32(pb);
 578         break;
 579     case 0x3201: /* PictureEssenceCoding */
 580         get_buffer(pb, descriptor->essence_codec_ul, 16);
 581         break;
 582     case 0x3203:
 583         descriptor->width = get_be32(pb);
 584         break;
 585     case 0x3202:
 586         descriptor->height = get_be32(pb);
 587         break;
 588     case 0x320E:
 589         descriptor->aspect_ratio.num = get_be32(pb);
 590         descriptor->aspect_ratio.den = get_be32(pb);
 591         break;
 592     case 0x3D03:
 593         descriptor->sample_rate.num = get_be32(pb);
 594         descriptor->sample_rate.den = get_be32(pb);
 595         break;
 596     case 0x3D06: /* SoundEssenceCompression */
 597         get_buffer(pb, descriptor->essence_codec_ul, 16);
 598         break;
 599     case 0x3D07:
 600         descriptor->channels = get_be32(pb);
 601         break;
 602     case 0x3D01:
 603         descriptor->bits_per_sample = get_be32(pb);
 604         break;
 605     case 0x3401:
 606         mxf_read_pixel_layout(pb, descriptor);
 607         break;
 608     default:
 609         /* Private uid used by SONY C0023S01.mxf */
 610         if (IS_KLV_KEY(uid, mxf_sony_mpeg4_extradata)) {
 611             descriptor->extradata = av_malloc(size);
 612             if (!descriptor->extradata)
 613                 return -1;
 614             descriptor->extradata_size = size;
 615             get_buffer(pb, descriptor->extradata, size);
 616         }
 617         break;
 618     }
 619     return 0;
 620 }
 621
 622 /* SMPTE RP224 http://www.smpte-ra.org/mdd/index.html */
 623 static const MXFDataDefinitionUL mxf_data_definition_uls[] = {
 624     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x01,0x00,0x00,0x00 }, CODEC_TYPE_VIDEO },
 625     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x01,0x03,0x02,0x02,0x02,0x00,0x00,0x00 }, CODEC_TYPE_AUDIO },
 626     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x05,0x01,0x03,0x02,0x02,0x02,0x02,0x00,0x00 }, CODEC_TYPE_AUDIO },
 627     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  CODEC_TYPE_DATA },
 628 };
 629
 630 static const MXFCodecUL mxf_codec_uls[] = {
 631     /* PictureEssenceCoding */
 632     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x01,0x11,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* MP@ML Long GoP */
 633     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x01,0x02,0x01,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* D-10 50Mbps PAL */
 634     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x03,0x03,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* MP@HL Long GoP */
 635     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x04,0x02,0x00 }, 14, CODEC_ID_MPEG2VIDEO }, /* 422P@HL I-Frame */
 636     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x03,0x04,0x01,0x02,0x02,0x01,0x20,0x02,0x03 }, 14,      CODEC_ID_MPEG4 }, /* XDCAM proxy_pal030926.mxf */
 637     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x02,0x02,0x01,0x02,0x00 }, 13,    CODEC_ID_DVVIDEO }, /* DV25 IEC PAL */
 638     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x01,0x02,0x02,0x03,0x01,0x01,0x00 }, 14,   CODEC_ID_JPEG2000 }, /* JPEG2000 Codestream */
 639     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x01,0x02,0x01,0x7F,0x00,0x00,0x00 }, 13,   CODEC_ID_RAWVIDEO }, /* Uncompressed */
 640     /* SoundEssenceCompression */
 641     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x00,0x00,0x00,0x00 }, 13,  CODEC_ID_PCM_S16LE }, /* Uncompressed */
 642     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x01,0x7F,0x00,0x00,0x00 }, 13,  CODEC_ID_PCM_S16LE },
 643     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x07,0x04,0x02,0x02,0x01,0x7E,0x00,0x00,0x00 }, 13,  CODEC_ID_PCM_S16BE }, /* From Omneon MXF file */
 644     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x04,0x04,0x02,0x02,0x02,0x03,0x01,0x01,0x00 }, 15,   CODEC_ID_PCM_ALAW }, /* XDCAM Proxy C0023S01.mxf */
 645     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x01,0x00 }, 15,        CODEC_ID_AC3 },
 646     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x05,0x00 }, 15,        CODEC_ID_MP2 }, /* MP2 or MP3 */
 647   //{ { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x04,0x02,0x02,0x02,0x03,0x02,0x1C,0x00 }, 15,    CODEC_ID_DOLBY_E }, /* Dolby-E */
 648     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },
 649 };
 650
 651 static const MXFCodecUL mxf_picture_essence_container_uls[] = {
 652     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x60,0x01 }, 14, CODEC_ID_MPEG2VIDEO }, /* MPEG-ES Frame wrapped */
 653     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x02,0x41,0x01 }, 14,    CODEC_ID_DVVIDEO }, /* DV 625 25mbps */
 654     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,       CODEC_ID_NONE },
 655 };
 656
 657 static const MXFCodecUL mxf_sound_essence_container_uls[] = {
 658     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x06,0x01,0x00 }, 14, CODEC_ID_PCM_S16LE }, /* BWF Frame wrapped */
 659     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x02,0x0D,0x01,0x03,0x01,0x02,0x04,0x40,0x01 }, 14,       CODEC_ID_MP2 }, /* MPEG-ES Frame wrapped, 0x40 ??? stream id */
 660     { { 0x06,0x0E,0x2B,0x34,0x04,0x01,0x01,0x01,0x0D,0x01,0x03,0x01,0x02,0x01,0x01,0x01 }, 14, CODEC_ID_PCM_S16LE }, /* D-10 Mapping 50Mbps PAL Extended Template */
 661     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 },  0,      CODEC_ID_NONE },
 662 };
 663
 664 /*
 665  * Match an uid independently of the version byte and up to len common bytes
 666  * Returns: boolean
 667  */
 668 static int mxf_match_uid(const UID key, const UID uid, int len)
 669 {
 670     int i;
 671     for (i = 0; i < len; i++) {
 672         if (i != 7 && key[i] != uid[i])
 673             return 0;
 674     }
 675     return 1;
 676 }
 677
 678 static const MXFCodecUL *mxf_get_codec_ul(const MXFCodecUL *uls, UID *uid)
 679 {
 680     while (uls->id != CODEC_ID_NONE) {
 681         if(mxf_match_uid(uls->uid, *uid, uls->matching_len))
 682             break;
 683         uls++;
 684     }
 685     return uls;
 686 }
 687
 688 static enum CodecType mxf_get_codec_type(const MXFDataDefinitionUL *uls, UID *uid)
 689 {
 690     while (uls->type != CODEC_TYPE_DATA) {
 691         if(mxf_match_uid(uls->uid, *uid, 16))
 692             break;
 693         uls++;
 694     }
 695     return uls->type;
 696 }
 697
 698 static void *mxf_resolve_strong_ref(MXFContext *mxf, UID *strong_ref, enum MXFMetadataSetType type)
 699 {
 700     int i;
 701
 702     if (!strong_ref)
 703         return NULL;
 704     for (i = 0; i < mxf->metadata_sets_count; i++) {
 705         if (!memcmp(*strong_ref, mxf->metadata_sets[i]->uid, 16) &&
 706             (type == AnyType || mxf->metadata_sets[i]->type == type)) {
 707             return mxf->metadata_sets[i];
 708         }
 709     }
 710     return NULL;
 711 }
 712
 713 static int mxf_parse_structural_metadata(MXFContext *mxf)
 714 {
 715     MXFPackage *material_package = NULL;
 716     MXFPackage *temp_package = NULL;
 717     int i, j, k;
 718
 719     dprintf(mxf->fc, "metadata sets count %d\n", mxf->metadata_sets_count);
 720     /* TODO: handle multiple material packages (OP3x) */
 721     for (i = 0; i < mxf->packages_count; i++) {
 722         material_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[i], MaterialPackage);
 723         if (material_package) break;
 724     }
 725     if (!material_package) {
 726         av_log(mxf->fc, AV_LOG_ERROR, "no material package found\n");
 727         return -1;
 728     }
 729
 730     for (i = 0; i < material_package->tracks_count; i++) {
 731         MXFPackage *source_package = NULL;
 732         MXFTrack *material_track = NULL;
 733         MXFTrack *source_track = NULL;
 734         MXFTrack *temp_track = NULL;
 735         MXFDescriptor *descriptor = NULL;
 736         MXFStructuralComponent *component = NULL;
 737         UID *essence_container_ul = NULL;
 738         const MXFCodecUL *codec_ul = NULL;
 739         const MXFCodecUL *container_ul = NULL;
 740         AVStream *st;
 741
 742         if (!(material_track = mxf_resolve_strong_ref(mxf, &material_package->tracks_refs[i], Track))) {
 743             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track strong ref\n");
 744             continue;
 745         }
 746
 747         if (!(material_track->sequence = mxf_resolve_strong_ref(mxf, &material_track->sequence_ref, Sequence))) {
 748             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve material track sequence strong ref\n");
 749             return -1;
 750         }
 751
 752         /* TODO: handle multiple source clips */
 753         for (j = 0; j < material_track->sequence->structural_components_count; j++) {
 754             /* TODO: handle timecode component */
 755             component = mxf_resolve_strong_ref(mxf, &material_track->sequence->structural_components_refs[j], SourceClip);
 756             if (!component)
 757                 continue;
 758
 759             for (k = 0; k < mxf->packages_count; k++) {
 760                 temp_package = mxf_resolve_strong_ref(mxf, &mxf->packages_refs[k], SourcePackage);
 761                 if (!temp_package)
 762                     continue;
 763                 if (!memcmp(temp_package->package_uid, component->source_package_uid, 16)) {
 764                     source_package = temp_package;
 765                     break;
 766                 }
 767             }
 768             if (!source_package) {
 769                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source package found\n", material_track->track_id);
 770                 break;
 771             }
 772             for (k = 0; k < source_package->tracks_count; k++) {
 773                 if (!(temp_track = mxf_resolve_strong_ref(mxf, &source_package->tracks_refs[k], Track))) {
 774                     av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track strong ref\n");
 775                     return -1;
 776                 }
 777                 if (temp_track->track_id == component->source_track_id) {
 778                     source_track = temp_track;
 779                     break;
 780                 }
 781             }
 782             if (!source_track) {
 783                 av_log(mxf->fc, AV_LOG_ERROR, "material track %d: no corresponding source track found\n", material_track->track_id);
 784                 break;
 785             }
 786         }
 787         if (!source_track)
 788             continue;
 789
 790         st = av_new_stream(mxf->fc, source_track->track_id);
 791         if (!st) {
 792             av_log(mxf->fc, AV_LOG_ERROR, "could not allocate stream\n");
 793             return -1;
 794         }
 795         st->priv_data = source_track;
 796         st->duration = component->duration;
 797         if (st->duration == -1)
 798             st->duration = AV_NOPTS_VALUE;
 799         st->start_time = component->start_position;
 800         av_set_pts_info(st, 64, material_track->edit_rate.num, material_track->edit_rate.den);
 801
 802         if (!(source_track->sequence = mxf_resolve_strong_ref(mxf, &source_track->sequence_ref, Sequence))) {
 803             av_log(mxf->fc, AV_LOG_ERROR, "could not resolve source track sequence strong ref\n");
 804             return -1;
 805         }
 806
 807 #ifdef DEBUG
 808         PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);
 809 #endif
 810         st->codec->codec_type = mxf_get_codec_type(mxf_data_definition_uls, &source_track->sequence->data_definition_ul);
 811
 812         source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);
 813         if (source_package->descriptor) {
 814             if (source_package->descriptor->type == MultipleDescriptor) {
 815                 for (j = 0; j < source_package->descriptor->sub_descriptors_count; j++) {
 816                     MXFDescriptor *sub_descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor->sub_descriptors_refs[j], Descriptor);
 817
 818                     if (!sub_descriptor) {
 819                         av_log(mxf->fc, AV_LOG_ERROR, "could not resolve sub descriptor strong ref\n");
 820                         continue;
 821                     }
 822                     if (sub_descriptor->linked_track_id == source_track->track_id) {
 823                         descriptor = sub_descriptor;
 824                         break;
 825                     }
 826                 }
 827             } else if (source_package->descriptor->type == Descriptor)
 828                 descriptor = source_package->descriptor;
 829         }
 830         if (!descriptor) {
 831             av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);
 832             continue;
 833         }
 834 #ifdef DEBUG
 835         PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);
 836         PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);
 837 #endif
 838         essence_container_ul = &descriptor->essence_container_ul;
 839         /* HACK: replacing the original key with mxf_encrypted_essence_container
 840          * is not allowed according to s429-6, try to find correct information anyway */
 841         if (IS_KLV_KEY(essence_container_ul, mxf_encrypted_essence_container)) {
 842             av_log(mxf->fc, AV_LOG_INFO, "broken encrypted mxf file\n");
 843             for (k = 0; k < mxf->metadata_sets_count; k++) {
 844                 MXFMetadataSet *metadata = mxf->metadata_sets[k];
 845                 if (metadata->type == CryptoContext) {
 846                     essence_container_ul = &((MXFCryptoContext *)metadata)->source_container_ul;
 847                     break;
 848                 }
 849             }
 850         }
 851         /* TODO: drop PictureEssenceCoding and SoundEssenceCompression, only check EssenceContainer */
 852         codec_ul = mxf_get_codec_ul(mxf_codec_uls, &descriptor->essence_codec_ul);
 853         st->codec->codec_id = codec_ul->id;
 854         if (descriptor->extradata) {
 855             st->codec->extradata = descriptor->extradata;
 856             st->codec->extradata_size = descriptor->extradata_size;
 857         }
 858         if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
 859             container_ul = mxf_get_codec_ul(mxf_picture_essence_container_uls, essence_container_ul);
 860             if (st->codec->codec_id == CODEC_ID_NONE)
 861                 st->codec->codec_id = container_ul->id;
 862             st->codec->width = descriptor->width;
 863             st->codec->height = descriptor->height;
 864             st->codec->bits_per_sample = descriptor->bits_per_sample; /* Uncompressed */
 865             st->need_parsing = AVSTREAM_PARSE_HEADERS;
 866         } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
 867             container_ul = mxf_get_codec_ul(mxf_sound_essence_container_uls, essence_container_ul);
 868             if (st->codec->codec_id == CODEC_ID_NONE)
 869                 st->codec->codec_id = container_ul->id;
 870             st->codec->channels = descriptor->channels;
 871             st->codec->bits_per_sample = descriptor->bits_per_sample;
 872             st->codec->sample_rate = descriptor->sample_rate.num / descriptor->sample_rate.den;
 873             /* TODO: implement CODEC_ID_RAWAUDIO */
 874             if (st->codec->codec_id == CODEC_ID_PCM_S16LE) {
 875                 if (descriptor->bits_per_sample == 24)
 876                     st->codec->codec_id = CODEC_ID_PCM_S24LE;
 877                 else if (descriptor->bits_per_sample == 32)
 878                     st->codec->codec_id = CODEC_ID_PCM_S32LE;
 879             } else if (st->codec->codec_id == CODEC_ID_PCM_S16BE) {
 880                 if (descriptor->bits_per_sample == 24)
 881                     st->codec->codec_id = CODEC_ID_PCM_S24BE;
 882                 else if (descriptor->bits_per_sample == 32)
 883                     st->codec->codec_id = CODEC_ID_PCM_S32BE;
 884             } else if (st->codec->codec_id == CODEC_ID_MP2) {
 885                 st->need_parsing = AVSTREAM_PARSE_FULL;
 886             }
 887         }
 888         if (st->codec->codec_type != CODEC_TYPE_DATA && (*essence_container_ul)[15] > 0x01) {
 889             av_log(mxf->fc, AV_LOG_WARNING, "only frame wrapped mappings are correctly supported\n");
 890             st->need_parsing = AVSTREAM_PARSE_FULL;
 891         }
 892     }
 893     return 0;
 894 }
 895
 896 static const MXFMetadataReadTableEntry mxf_metadata_read_table[] = {
 897     { { 0x06,0x0E,0x2B,0x34,0x02,0x05,0x01,0x01,0x0d,0x01,0x02,0x01,0x01,0x05,0x01,0x00 }, mxf_read_primer_pack },
 898     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x18,0x00 }, mxf_read_content_storage, 0, AnyType },
 899     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x37,0x00 }, mxf_read_source_package, sizeof(MXFPackage), SourcePackage },
 900     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x36,0x00 }, mxf_read_material_package, sizeof(MXFPackage), MaterialPackage },
 901     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x0F,0x00 }, mxf_read_sequence, sizeof(MXFSequence), Sequence },
 902     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x11,0x00 }, mxf_read_source_clip, sizeof(MXFStructuralComponent), SourceClip },
 903     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x44,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), MultipleDescriptor },
 904     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x42,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Generic Sound */
 905     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x28,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* CDCI */
 906     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x29,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* RGBA */
 907     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x51,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* MPEG 2 Video */
 908     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x48,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* Wave */
 909     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x47,0x00 }, mxf_read_generic_descriptor, sizeof(MXFDescriptor), Descriptor }, /* AES3 */
 910     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3A,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Static Track */
 911     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x01,0x01,0x01,0x01,0x3B,0x00 }, mxf_read_track, sizeof(MXFTrack), Track }, /* Generic Track */
 912     { { 0x06,0x0E,0x2B,0x34,0x02,0x53,0x01,0x01,0x0d,0x01,0x04,0x01,0x02,0x02,0x00,0x00 }, mxf_read_cryptographic_context, sizeof(MXFCryptoContext), CryptoContext },
 913     { { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 }, NULL, 0, AnyType },
 914 };
 915
 916 static int mxf_read_local_tags(MXFContext *mxf, KLVPacket *klv, int (*read_child)(), int ctx_size, enum MXFMetadataSetType type)
 917 {
 918     ByteIOContext *pb = mxf->fc->pb;
 919     MXFMetadataSet *ctx = ctx_size ? av_mallocz(ctx_size) : mxf;
 920     uint64_t klv_end = url_ftell(pb) + klv->length;
 921
 922     if (!ctx)
 923         return -1;
 924     while (url_ftell(pb) + 4 < klv_end) {
 925         int tag = get_be16(pb);
 926         int size = get_be16(pb); /* KLV specified by 0x53 */
 927         uint64_t next = url_ftell(pb) + size;
 928         UID uid = {0};
 929
 930         if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */
 931             av_log(mxf->fc, AV_LOG_ERROR, "local tag 0x%04X with 0 size\n", tag);
 932             continue;
 933         }
 934         if (tag > 0x7FFF) { /* dynamic tag */
 935             int i;
 936             for (i = 0; i < mxf->local_tags_count; i++) {
 937                 int local_tag = AV_RB16(mxf->local_tags+i*18);
 938                 if (local_tag == tag) {
 939                     memcpy(uid, mxf->local_tags+i*18+2, 16);
 940                     dprintf(mxf->fc, "local tag 0x%04X\n", local_tag);
 941 #ifdef DEBUG
 942                     PRINT_KEY(mxf->fc, "uid", uid);
 943 #endif
 944                 }
 945             }
 946         }
 947         if (ctx_size && tag == 0x3C0A)
 948             get_buffer(pb, ctx->uid, 16);
 949         else if (read_child(ctx, pb, tag, size, uid) < 0)
 950             return -1;
 951
 952         url_fseek(pb, next, SEEK_SET);
 953     }
 954     if (ctx_size) ctx->type = type;
 955     return ctx_size ? mxf_add_metadata_set(mxf, ctx) : 0;
 956 }
 957
 958 static int mxf_read_header(AVFormatContext *s, AVFormatParameters *ap)
 959 {
 960     MXFContext *mxf = s->priv_data;
 961     KLVPacket klv;
 962
 963     if (!mxf_read_sync(s->pb, mxf_header_partition_pack_key, 14)) {
 964         av_log(s, AV_LOG_ERROR, "could not find header partition pack key\n");
 965         return -1;
 966     }
 967     url_fseek(s->pb, -14, SEEK_CUR);
 968     mxf->fc = s;
 969     while (!url_feof(s->pb)) {
 970         const MXFMetadataReadTableEntry *metadata;
 971
 972         if (klv_read_packet(&klv, s->pb) < 0)
 973             return -1;
 974 #ifdef DEBUG
 975         PRINT_KEY(s, "read header", klv.key);
 976 #endif
 977         if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||
 978             IS_KLV_KEY(klv.key, mxf_essence_element_key)) {
 979             /* FIXME avoid seek */
 980             url_fseek(s->pb, klv.offset, SEEK_SET);
 981             break;
 982         }
 983
 984         for (metadata = mxf_metadata_read_table; metadata->read; metadata++) {
 985             if (IS_KLV_KEY(klv.key, metadata->key)) {
 986                 int (*read)() = klv.key[5] == 0x53 ? mxf_read_local_tags : metadata->read;
 987                 if (read(mxf, &klv, metadata->read, metadata->ctx_size, metadata->type) < 0) {
 988                     av_log(s, AV_LOG_ERROR, "error reading header metadata\n");
 989                     return -1;
 990                 }
 991                 break;
 992             }
 993         }
 994         if (!metadata->read)
 995             url_fskip(s->pb, klv.length);
 996     }
 997     return mxf_parse_structural_metadata(mxf);
 998 }
 999
1000 static int mxf_read_close(AVFormatContext *s)
1001 {
1002     MXFContext *mxf = s->priv_data;
1003     int i;
1004
1005     av_freep(&mxf->packages_refs);
1006     for (i = 0; i < mxf->metadata_sets_count; i++) {
1007         switch (mxf->metadata_sets[i]->type) {
1008         case MultipleDescriptor:
1009             av_freep(&((MXFDescriptor *)mxf->metadata_sets[i])->sub_descriptors_refs);
1010             break;
1011         case Sequence:
1012             av_freep(&((MXFSequence *)mxf->metadata_sets[i])->structural_components_refs);
1013             break;
1014         case SourcePackage:
1015         case MaterialPackage:
1016             av_freep(&((MXFPackage *)mxf->metadata_sets[i])->tracks_refs);
1017             break;
1018         case Track:
1019             mxf->metadata_sets[i] = NULL; /* will be freed later */
1020             break;
1021         default:
1022             break;
1023         }
1024         av_freep(&mxf->metadata_sets[i]);
1025     }
1026     av_freep(&mxf->metadata_sets);
1027     av_freep(&mxf->aesc);
1028     av_freep(&mxf->local_tags);
1029     return 0;
1030 }
1031
1032 static int mxf_probe(AVProbeData *p) {
1033     uint8_t *bufp = p->buf;
1034     uint8_t *end = p->buf + p->buf_size;
1035
1036     if (p->buf_size < sizeof(mxf_header_partition_pack_key))
1037         return 0;
1038
1039     /* Must skip Run-In Sequence and search for MXF header partition pack key SMPTE 377M 5.5 */
1040     end -= sizeof(mxf_header_partition_pack_key);
1041     for (; bufp < end; bufp++) {
1042         if (IS_KLV_KEY(bufp, mxf_header_partition_pack_key))
1043             return AVPROBE_SCORE_MAX;
1044     }
1045     return 0;
1046 }
1047
1048 /* rudimentary byte seek */
1049 /* XXX: use MXF Index */
1050 static int mxf_read_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)
1051 {
1052     AVStream *st = s->streams[stream_index];
1053     int64_t seconds;
1054
1055     if (!s->bit_rate)
1056         return -1;
1057     if (sample_time < 0)
1058         sample_time = 0;
1059     seconds = av_rescale(sample_time, st->time_base.num, st->time_base.den);
1060     url_fseek(s->pb, (s->bit_rate * seconds) >> 3, SEEK_SET);
1061     av_update_cur_dts(s, st, sample_time);
1062     return 0;
1063 }
1064
1065 AVInputFormat mxf_demuxer = {
1066     "mxf",
1067     NULL_IF_CONFIG_SMALL("MXF format"),
1068     sizeof(MXFContext),
1069     mxf_probe,
1070     mxf_read_header,
1071     mxf_read_packet,
1072     mxf_read_close,
1073     mxf_read_seek,
1074 };