src/media/mp4/box_definitions.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/mp4/box_definitions.h"
   6
   7 #include "base/logging.h"
   8 #include "media/mp4/es_descriptor.h"
   9 #include "media/mp4/rcheck.h"
  10
  11 namespace media {
  12 namespace mp4 {
  13
  14 FileType::FileType() {}
  15 FileType::~FileType() {}
  16 FourCC FileType::BoxType() const { return FOURCC_FTYP; }
  17
  18 bool FileType::Parse(BoxReader* reader) {
  19   RCHECK(reader->ReadFourCC(&major_brand) && reader->Read4(&minor_version));
  20   size_t num_brands = (reader->size() - reader->pos()) / sizeof(FourCC);
  21   return reader->SkipBytes(sizeof(FourCC) * num_brands);  // compatible_brands
  22 }
  23
  24 ProtectionSystemSpecificHeader::ProtectionSystemSpecificHeader() {}
  25 ProtectionSystemSpecificHeader::~ProtectionSystemSpecificHeader() {}
  26 FourCC ProtectionSystemSpecificHeader::BoxType() const { return FOURCC_PSSH; }
  27
  28 bool ProtectionSystemSpecificHeader::Parse(BoxReader* reader) {
  29   // Validate the box's contents and hang on to the system ID.
  30   uint32 size;
  31   RCHECK(reader->ReadFullBoxHeader() &&
  32          reader->ReadVec(&system_id, 16) &&
  33          reader->Read4(&size) &&
  34          reader->HasBytes(size));
  35
  36   // Copy the entire box, including the header, for passing to EME as initData.
  37   DCHECK(raw_box.empty());
  38   raw_box.assign(reader->data(), reader->data() + reader->size());
  39   return true;
  40 }
  41
  42 SampleAuxiliaryInformationOffset::SampleAuxiliaryInformationOffset() {}
  43 SampleAuxiliaryInformationOffset::~SampleAuxiliaryInformationOffset() {}
  44 FourCC SampleAuxiliaryInformationOffset::BoxType() const { return FOURCC_SAIO; }
  45
  46 bool SampleAuxiliaryInformationOffset::Parse(BoxReader* reader) {
  47   RCHECK(reader->ReadFullBoxHeader());
  48   if (reader->flags() & 1)
  49     RCHECK(reader->SkipBytes(8));
  50
  51   uint32 count;
  52   RCHECK(reader->Read4(&count) &&
  53          reader->HasBytes(count * (reader->version() == 1 ? 8 : 4)));
  54   offsets.resize(count);
  55
  56   for (uint32 i = 0; i < count; i++) {
  57     if (reader->version() == 1) {
  58       RCHECK(reader->Read8(&offsets[i]));
  59     } else {
  60       RCHECK(reader->Read4Into8(&offsets[i]));
  61     }
  62   }
  63   return true;
  64 }
  65
  66 SampleAuxiliaryInformationSize::SampleAuxiliaryInformationSize()
  67   : default_sample_info_size(0), sample_count(0) {
  68 }
  69 SampleAuxiliaryInformationSize::~SampleAuxiliaryInformationSize() {}
  70 FourCC SampleAuxiliaryInformationSize::BoxType() const { return FOURCC_SAIZ; }
  71
  72 bool SampleAuxiliaryInformationSize::Parse(BoxReader* reader) {
  73   RCHECK(reader->ReadFullBoxHeader());
  74   if (reader->flags() & 1)
  75     RCHECK(reader->SkipBytes(8));
  76
  77   RCHECK(reader->Read1(&default_sample_info_size) &&
  78          reader->Read4(&sample_count));
  79   if (default_sample_info_size == 0)
  80     return reader->ReadVec(&sample_info_sizes, sample_count);
  81   return true;
  82 }
  83
  84 OriginalFormat::OriginalFormat() : format(FOURCC_NULL) {}
  85 OriginalFormat::~OriginalFormat() {}
  86 FourCC OriginalFormat::BoxType() const { return FOURCC_FRMA; }
  87
  88 bool OriginalFormat::Parse(BoxReader* reader) {
  89   return reader->ReadFourCC(&format);
  90 }
  91
  92 SchemeType::SchemeType() : type(FOURCC_NULL), version(0) {}
  93 SchemeType::~SchemeType() {}
  94 FourCC SchemeType::BoxType() const { return FOURCC_SCHM; }
  95
  96 bool SchemeType::Parse(BoxReader* reader) {
  97   RCHECK(reader->ReadFullBoxHeader() &&
  98          reader->ReadFourCC(&type) &&
  99          reader->Read4(&version));
 100   return true;
 101 }
 102
 103 TrackEncryption::TrackEncryption()
 104   : is_encrypted(false), default_iv_size(0) {
 105 }
 106 TrackEncryption::~TrackEncryption() {}
 107 FourCC TrackEncryption::BoxType() const { return FOURCC_TENC; }
 108
 109 bool TrackEncryption::Parse(BoxReader* reader) {
 110   uint8 flag;
 111   RCHECK(reader->ReadFullBoxHeader() &&
 112          reader->SkipBytes(2) &&
 113          reader->Read1(&flag) &&
 114          reader->Read1(&default_iv_size) &&
 115          reader->ReadVec(&default_kid, 16));
 116   is_encrypted = (flag != 0);
 117   if (is_encrypted) {
 118     RCHECK(default_iv_size == 8 || default_iv_size == 16);
 119   } else {
 120     RCHECK(default_iv_size == 0);
 121   }
 122   return true;
 123 }
 124
 125 SchemeInfo::SchemeInfo() {}
 126 SchemeInfo::~SchemeInfo() {}
 127 FourCC SchemeInfo::BoxType() const { return FOURCC_SCHI; }
 128
 129 bool SchemeInfo::Parse(BoxReader* reader) {
 130   return reader->ScanChildren() && reader->ReadChild(&track_encryption);
 131 }
 132
 133 ProtectionSchemeInfo::ProtectionSchemeInfo() {}
 134 ProtectionSchemeInfo::~ProtectionSchemeInfo() {}
 135 FourCC ProtectionSchemeInfo::BoxType() const { return FOURCC_SINF; }
 136
 137 bool ProtectionSchemeInfo::Parse(BoxReader* reader) {
 138   RCHECK(reader->ScanChildren() &&
 139          reader->ReadChild(&format) &&
 140          reader->ReadChild(&type));
 141   if (type.type == FOURCC_CENC)
 142     RCHECK(reader->ReadChild(&info));
 143   // Other protection schemes are silently ignored. Since the protection scheme
 144   // type can't be determined until this box is opened, we return 'true' for
 145   // non-CENC protection scheme types. It is the parent box's responsibility to
 146   // ensure that this scheme type is a supported one.
 147   return true;
 148 }
 149
 150 MovieHeader::MovieHeader()
 151     : creation_time(0),
 152       modification_time(0),
 153       timescale(0),
 154       duration(0),
 155       rate(-1),
 156       volume(-1),
 157       next_track_id(0) {}
 158 MovieHeader::~MovieHeader() {}
 159 FourCC MovieHeader::BoxType() const { return FOURCC_MVHD; }
 160
 161 bool MovieHeader::Parse(BoxReader* reader) {
 162   RCHECK(reader->ReadFullBoxHeader());
 163
 164   if (reader->version() == 1) {
 165     RCHECK(reader->Read8(&creation_time) &&
 166            reader->Read8(&modification_time) &&
 167            reader->Read4(&timescale) &&
 168            reader->Read8(&duration));
 169   } else {
 170     RCHECK(reader->Read4Into8(&creation_time) &&
 171            reader->Read4Into8(&modification_time) &&
 172            reader->Read4(&timescale) &&
 173            reader->Read4Into8(&duration));
 174   }
 175
 176   RCHECK(reader->Read4s(&rate) &&
 177          reader->Read2s(&volume) &&
 178          reader->SkipBytes(10) &&  // reserved
 179          reader->SkipBytes(36) &&  // matrix
 180          reader->SkipBytes(24) &&  // predefined zero
 181          reader->Read4(&next_track_id));
 182   return true;
 183 }
 184
 185 TrackHeader::TrackHeader()
 186     : creation_time(0),
 187       modification_time(0),
 188       track_id(0),
 189       duration(0),
 190       layer(-1),
 191       alternate_group(-1),
 192       volume(-1),
 193       width(0),
 194       height(0) {}
 195 TrackHeader::~TrackHeader() {}
 196 FourCC TrackHeader::BoxType() const { return FOURCC_TKHD; }
 197
 198 bool TrackHeader::Parse(BoxReader* reader) {
 199   RCHECK(reader->ReadFullBoxHeader());
 200   if (reader->version() == 1) {
 201     RCHECK(reader->Read8(&creation_time) &&
 202            reader->Read8(&modification_time) &&
 203            reader->Read4(&track_id) &&
 204            reader->SkipBytes(4) &&    // reserved
 205            reader->Read8(&duration));
 206   } else {
 207     RCHECK(reader->Read4Into8(&creation_time) &&
 208            reader->Read4Into8(&modification_time) &&
 209            reader->Read4(&track_id) &&
 210            reader->SkipBytes(4) &&   // reserved
 211            reader->Read4Into8(&duration));
 212   }
 213
 214   RCHECK(reader->SkipBytes(8) &&  // reserved
 215          reader->Read2s(&layer) &&
 216          reader->Read2s(&alternate_group) &&
 217          reader->Read2s(&volume) &&
 218          reader->SkipBytes(2) &&  // reserved
 219          reader->SkipBytes(36) &&  // matrix
 220          reader->Read4(&width) &&
 221          reader->Read4(&height));
 222   width >>= 16;
 223   height >>= 16;
 224   return true;
 225 }
 226
 227 SampleDescription::SampleDescription() : type(kInvalid) {}
 228 SampleDescription::~SampleDescription() {}
 229 FourCC SampleDescription::BoxType() const { return FOURCC_STSD; }
 230
 231 bool SampleDescription::Parse(BoxReader* reader) {
 232   uint32 count;
 233   RCHECK(reader->SkipBytes(4) &&
 234          reader->Read4(&count));
 235   video_entries.clear();
 236   audio_entries.clear();
 237
 238   // Note: this value is preset before scanning begins. See comments in the
 239   // Parse(Media*) function.
 240   if (type == kVideo) {
 241     RCHECK(reader->ReadAllChildren(&video_entries));
 242   } else if (type == kAudio) {
 243     RCHECK(reader->ReadAllChildren(&audio_entries));
 244   }
 245   return true;
 246 }
 247
 248 SampleTable::SampleTable() {}
 249 SampleTable::~SampleTable() {}
 250 FourCC SampleTable::BoxType() const { return FOURCC_STBL; }
 251
 252 bool SampleTable::Parse(BoxReader* reader) {
 253   return reader->ScanChildren() &&
 254          reader->ReadChild(&description);
 255 }
 256
 257 EditList::EditList() {}
 258 EditList::~EditList() {}
 259 FourCC EditList::BoxType() const { return FOURCC_ELST; }
 260
 261 bool EditList::Parse(BoxReader* reader) {
 262   uint32 count;
 263   RCHECK(reader->ReadFullBoxHeader() && reader->Read4(&count));
 264
 265   if (reader->version() == 1) {
 266     RCHECK(reader->HasBytes(count * 20));
 267   } else {
 268     RCHECK(reader->HasBytes(count * 12));
 269   }
 270   edits.resize(count);
 271
 272   for (std::vector<EditListEntry>::iterator edit = edits.begin();
 273        edit != edits.end(); ++edit) {
 274     if (reader->version() == 1) {
 275       RCHECK(reader->Read8(&edit->segment_duration) &&
 276              reader->Read8s(&edit->media_time));
 277     } else {
 278       RCHECK(reader->Read4Into8(&edit->segment_duration) &&
 279              reader->Read4sInto8s(&edit->media_time));
 280     }
 281     RCHECK(reader->Read2s(&edit->media_rate_integer) &&
 282            reader->Read2s(&edit->media_rate_fraction));
 283   }
 284   return true;
 285 }
 286
 287 Edit::Edit() {}
 288 Edit::~Edit() {}
 289 FourCC Edit::BoxType() const { return FOURCC_EDTS; }
 290
 291 bool Edit::Parse(BoxReader* reader) {
 292   return reader->ScanChildren() && reader->ReadChild(&list);
 293 }
 294
 295 HandlerReference::HandlerReference() : type(kInvalid) {}
 296 HandlerReference::~HandlerReference() {}
 297 FourCC HandlerReference::BoxType() const { return FOURCC_HDLR; }
 298
 299 bool HandlerReference::Parse(BoxReader* reader) {
 300   FourCC hdlr_type;
 301   RCHECK(reader->SkipBytes(8) && reader->ReadFourCC(&hdlr_type));
 302   // Note: remaining fields in box ignored
 303   if (hdlr_type == FOURCC_VIDE) {
 304     type = kVideo;
 305   } else if (hdlr_type == FOURCC_SOUN) {
 306     type = kAudio;
 307   } else {
 308     type = kInvalid;
 309   }
 310   return true;
 311 }
 312
 313 AVCDecoderConfigurationRecord::AVCDecoderConfigurationRecord()
 314     : version(0),
 315       profile_indication(0),
 316       profile_compatibility(0),
 317       avc_level(0),
 318       length_size(0) {}
 319
 320 AVCDecoderConfigurationRecord::~AVCDecoderConfigurationRecord() {}
 321 FourCC AVCDecoderConfigurationRecord::BoxType() const { return FOURCC_AVCC; }
 322
 323 bool AVCDecoderConfigurationRecord::Parse(BoxReader* reader) {
 324   RCHECK(reader->Read1(&version) && version == 1 &&
 325          reader->Read1(&profile_indication) &&
 326          reader->Read1(&profile_compatibility) &&
 327          reader->Read1(&avc_level));
 328
 329   uint8 length_size_minus_one;
 330   RCHECK(reader->Read1(&length_size_minus_one) &&
 331          (length_size_minus_one & 0xfc) == 0xfc);
 332   length_size = (length_size_minus_one & 0x3) + 1;
 333
 334   uint8 num_sps;
 335   RCHECK(reader->Read1(&num_sps) && (num_sps & 0xe0) == 0xe0);
 336   num_sps &= 0x1f;
 337
 338   sps_list.resize(num_sps);
 339   for (int i = 0; i < num_sps; i++) {
 340     uint16 sps_length;
 341     RCHECK(reader->Read2(&sps_length) &&
 342            reader->ReadVec(&sps_list[i], sps_length));
 343   }
 344
 345   uint8 num_pps;
 346   RCHECK(reader->Read1(&num_pps));
 347
 348   pps_list.resize(num_pps);
 349   for (int i = 0; i < num_pps; i++) {
 350     uint16 pps_length;
 351     RCHECK(reader->Read2(&pps_length) &&
 352            reader->ReadVec(&pps_list[i], pps_length));
 353   }
 354
 355   return true;
 356 }
 357
 358 PixelAspectRatioBox::PixelAspectRatioBox() : h_spacing(1), v_spacing(1) {}
 359 PixelAspectRatioBox::~PixelAspectRatioBox() {}
 360 FourCC PixelAspectRatioBox::BoxType() const { return FOURCC_PASP; }
 361
 362 bool PixelAspectRatioBox::Parse(BoxReader* reader) {
 363   RCHECK(reader->Read4(&h_spacing) &&
 364          reader->Read4(&v_spacing));
 365   return true;
 366 }
 367
 368 VideoSampleEntry::VideoSampleEntry()
 369     : format(FOURCC_NULL),
 370       data_reference_index(0),
 371       width(0),
 372       height(0) {}
 373
 374 VideoSampleEntry::~VideoSampleEntry() {}
 375 FourCC VideoSampleEntry::BoxType() const {
 376   DCHECK(false) << "VideoSampleEntry should be parsed according to the "
 377                 << "handler type recovered in its Media ancestor.";
 378   return FOURCC_NULL;
 379 }
 380
 381 bool VideoSampleEntry::Parse(BoxReader* reader) {
 382   format = reader->type();
 383   RCHECK(reader->SkipBytes(6) &&
 384          reader->Read2(&data_reference_index) &&
 385          reader->SkipBytes(16) &&
 386          reader->Read2(&width) &&
 387          reader->Read2(&height) &&
 388          reader->SkipBytes(50));
 389
 390   RCHECK(reader->ScanChildren() &&
 391          reader->MaybeReadChild(&pixel_aspect));
 392
 393   if (format == FOURCC_ENCV) {
 394     // Continue scanning until a recognized protection scheme is found, or until
 395     // we run out of protection schemes.
 396     while (sinf.type.type != FOURCC_CENC) {
 397       if (!reader->ReadChild(&sinf))
 398         return false;
 399     }
 400   }
 401
 402   if (IsFormatValid())
 403     RCHECK(reader->ReadChild(&avcc));
 404
 405   return true;
 406 }
 407
 408 bool VideoSampleEntry::IsFormatValid() const {
 409   return format == FOURCC_AVC1 || format == FOURCC_AVC3 ||
 410       (format == FOURCC_ENCV && (sinf.format.format == FOURCC_AVC1 ||
 411                                  sinf.format.format == FOURCC_AVC3));
 412 }
 413
 414 ElementaryStreamDescriptor::ElementaryStreamDescriptor()
 415     : object_type(kForbidden) {}
 416
 417 ElementaryStreamDescriptor::~ElementaryStreamDescriptor() {}
 418
 419 FourCC ElementaryStreamDescriptor::BoxType() const {
 420   return FOURCC_ESDS;
 421 }
 422
 423 bool ElementaryStreamDescriptor::Parse(BoxReader* reader) {
 424   std::vector<uint8> data;
 425   ESDescriptor es_desc;
 426
 427   RCHECK(reader->ReadFullBoxHeader());
 428   RCHECK(reader->ReadVec(&data, reader->size() - reader->pos()));
 429   RCHECK(es_desc.Parse(data));
 430
 431   object_type = es_desc.object_type();
 432
 433   RCHECK(aac.Parse(es_desc.decoder_specific_info()));
 434
 435   return true;
 436 }
 437
 438 AudioSampleEntry::AudioSampleEntry()
 439     : format(FOURCC_NULL),
 440       data_reference_index(0),
 441       channelcount(0),
 442       samplesize(0),
 443       samplerate(0) {}
 444
 445 AudioSampleEntry::~AudioSampleEntry() {}
 446
 447 FourCC AudioSampleEntry::BoxType() const {
 448   DCHECK(false) << "AudioSampleEntry should be parsed according to the "
 449                 << "handler type recovered in its Media ancestor.";
 450   return FOURCC_NULL;
 451 }
 452
 453 bool AudioSampleEntry::Parse(BoxReader* reader) {
 454   format = reader->type();
 455   RCHECK(reader->SkipBytes(6) &&
 456          reader->Read2(&data_reference_index) &&
 457          reader->SkipBytes(8) &&
 458          reader->Read2(&channelcount) &&
 459          reader->Read2(&samplesize) &&
 460          reader->SkipBytes(4) &&
 461          reader->Read4(&samplerate));
 462   // Convert from 16.16 fixed point to integer
 463   samplerate >>= 16;
 464
 465   RCHECK(reader->ScanChildren());
 466   if (format == FOURCC_ENCA) {
 467     // Continue scanning until a recognized protection scheme is found, or until
 468     // we run out of protection schemes.
 469     while (sinf.type.type != FOURCC_CENC) {
 470       if (!reader->ReadChild(&sinf))
 471         return false;
 472     }
 473   }
 474
 475   // ESDS is not valid in case of EAC3.
 476   RCHECK(reader->MaybeReadChild(&esds));
 477   return true;
 478 }
 479
 480 MediaHeader::MediaHeader()
 481     : creation_time(0),
 482       modification_time(0),
 483       timescale(0),
 484       duration(0) {}
 485 MediaHeader::~MediaHeader() {}
 486 FourCC MediaHeader::BoxType() const { return FOURCC_MDHD; }
 487
 488 bool MediaHeader::Parse(BoxReader* reader) {
 489   RCHECK(reader->ReadFullBoxHeader());
 490
 491   if (reader->version() == 1) {
 492     RCHECK(reader->Read8(&creation_time) &&
 493            reader->Read8(&modification_time) &&
 494            reader->Read4(&timescale) &&
 495            reader->Read8(&duration));
 496   } else {
 497     RCHECK(reader->Read4Into8(&creation_time) &&
 498            reader->Read4Into8(&modification_time) &&
 499            reader->Read4(&timescale) &&
 500            reader->Read4Into8(&duration));
 501   }
 502   // Skip language information
 503   return reader->SkipBytes(4);
 504 }
 505
 506 MediaInformation::MediaInformation() {}
 507 MediaInformation::~MediaInformation() {}
 508 FourCC MediaInformation::BoxType() const { return FOURCC_MINF; }
 509
 510 bool MediaInformation::Parse(BoxReader* reader) {
 511   return reader->ScanChildren() &&
 512          reader->ReadChild(&sample_table);
 513 }
 514
 515 Media::Media() {}
 516 Media::~Media() {}
 517 FourCC Media::BoxType() const { return FOURCC_MDIA; }
 518
 519 bool Media::Parse(BoxReader* reader) {
 520   RCHECK(reader->ScanChildren() &&
 521          reader->ReadChild(&header) &&
 522          reader->ReadChild(&handler));
 523
 524   // Maddeningly, the HandlerReference box specifies how to parse the
 525   // SampleDescription box, making the latter the only box (of those that we
 526   // support) which cannot be parsed correctly on its own (or even with
 527   // information from its strict ancestor tree). We thus copy the handler type
 528   // to the sample description box *before* parsing it to provide this
 529   // information while parsing.
 530   information.sample_table.description.type = handler.type;
 531   RCHECK(reader->ReadChild(&information));
 532   return true;
 533 }
 534
 535 Track::Track() {}
 536 Track::~Track() {}
 537 FourCC Track::BoxType() const { return FOURCC_TRAK; }
 538
 539 bool Track::Parse(BoxReader* reader) {
 540   RCHECK(reader->ScanChildren() &&
 541          reader->ReadChild(&header) &&
 542          reader->ReadChild(&media) &&
 543          reader->MaybeReadChild(&edit));
 544   return true;
 545 }
 546
 547 MovieExtendsHeader::MovieExtendsHeader() : fragment_duration(0) {}
 548 MovieExtendsHeader::~MovieExtendsHeader() {}
 549 FourCC MovieExtendsHeader::BoxType() const { return FOURCC_MEHD; }
 550
 551 bool MovieExtendsHeader::Parse(BoxReader* reader) {
 552   RCHECK(reader->ReadFullBoxHeader());
 553   if (reader->version() == 1) {
 554     RCHECK(reader->Read8(&fragment_duration));
 555   } else {
 556     RCHECK(reader->Read4Into8(&fragment_duration));
 557   }
 558   return true;
 559 }
 560
 561 TrackExtends::TrackExtends()
 562     : track_id(0),
 563       default_sample_description_index(0),
 564       default_sample_duration(0),
 565       default_sample_size(0),
 566       default_sample_flags(0) {}
 567 TrackExtends::~TrackExtends() {}
 568 FourCC TrackExtends::BoxType() const { return FOURCC_TREX; }
 569
 570 bool TrackExtends::Parse(BoxReader* reader) {
 571   RCHECK(reader->ReadFullBoxHeader() &&
 572          reader->Read4(&track_id) &&
 573          reader->Read4(&default_sample_description_index) &&
 574          reader->Read4(&default_sample_duration) &&
 575          reader->Read4(&default_sample_size) &&
 576          reader->Read4(&default_sample_flags));
 577   return true;
 578 }
 579
 580 MovieExtends::MovieExtends() {}
 581 MovieExtends::~MovieExtends() {}
 582 FourCC MovieExtends::BoxType() const { return FOURCC_MVEX; }
 583
 584 bool MovieExtends::Parse(BoxReader* reader) {
 585   header.fragment_duration = 0;
 586   return reader->ScanChildren() &&
 587          reader->MaybeReadChild(&header) &&
 588          reader->ReadChildren(&tracks);
 589 }
 590
 591 Movie::Movie() : fragmented(false) {}
 592 Movie::~Movie() {}
 593 FourCC Movie::BoxType() const { return FOURCC_MOOV; }
 594
 595 bool Movie::Parse(BoxReader* reader) {
 596   return reader->ScanChildren() &&
 597          reader->ReadChild(&header) &&
 598          reader->ReadChildren(&tracks) &&
 599          // Media Source specific: 'mvex' required
 600          reader->ReadChild(&extends) &&
 601          reader->MaybeReadChildren(&pssh);
 602 }
 603
 604 TrackFragmentDecodeTime::TrackFragmentDecodeTime() : decode_time(0) {}
 605 TrackFragmentDecodeTime::~TrackFragmentDecodeTime() {}
 606 FourCC TrackFragmentDecodeTime::BoxType() const { return FOURCC_TFDT; }
 607
 608 bool TrackFragmentDecodeTime::Parse(BoxReader* reader) {
 609   RCHECK(reader->ReadFullBoxHeader());
 610   if (reader->version() == 1)
 611     return reader->Read8(&decode_time);
 612   else
 613     return reader->Read4Into8(&decode_time);
 614 }
 615
 616 MovieFragmentHeader::MovieFragmentHeader() : sequence_number(0) {}
 617 MovieFragmentHeader::~MovieFragmentHeader() {}
 618 FourCC MovieFragmentHeader::BoxType() const { return FOURCC_MFHD; }
 619
 620 bool MovieFragmentHeader::Parse(BoxReader* reader) {
 621   return reader->SkipBytes(4) && reader->Read4(&sequence_number);
 622 }
 623
 624 TrackFragmentHeader::TrackFragmentHeader()
 625     : track_id(0),
 626       sample_description_index(0),
 627       default_sample_duration(0),
 628       default_sample_size(0),
 629       default_sample_flags(0),
 630       has_default_sample_flags(false) {}
 631
 632 TrackFragmentHeader::~TrackFragmentHeader() {}
 633 FourCC TrackFragmentHeader::BoxType() const { return FOURCC_TFHD; }
 634
 635 bool TrackFragmentHeader::Parse(BoxReader* reader) {
 636   RCHECK(reader->ReadFullBoxHeader() && reader->Read4(&track_id));
 637
 638   // Media Source specific: reject tracks that set 'base-data-offset-present'.
 639   // Although the Media Source requires that 'default-base-is-moof' (14496-12
 640   // Amendment 2) be set, we omit this check as many otherwise-valid files in
 641   // the wild don't set it.
 642   //
 643   //  RCHECK((flags & 0x020000) && !(flags & 0x1));
 644   RCHECK(!(reader->flags() & 0x1));
 645
 646   if (reader->flags() & 0x2) {
 647     RCHECK(reader->Read4(&sample_description_index));
 648   } else {
 649     sample_description_index = 0;
 650   }
 651
 652   if (reader->flags() & 0x8) {
 653     RCHECK(reader->Read4(&default_sample_duration));
 654   } else {
 655     default_sample_duration = 0;
 656   }
 657
 658   if (reader->flags() & 0x10) {
 659     RCHECK(reader->Read4(&default_sample_size));
 660   } else {
 661     default_sample_size = 0;
 662   }
 663
 664   if (reader->flags() & 0x20) {
 665     RCHECK(reader->Read4(&default_sample_flags));
 666     has_default_sample_flags = true;
 667   } else {
 668     has_default_sample_flags = false;
 669   }
 670
 671   return true;
 672 }
 673
 674 TrackFragmentRun::TrackFragmentRun()
 675     : sample_count(0), data_offset(0) {}
 676 TrackFragmentRun::~TrackFragmentRun() {}
 677 FourCC TrackFragmentRun::BoxType() const { return FOURCC_TRUN; }
 678
 679 bool TrackFragmentRun::Parse(BoxReader* reader) {
 680   RCHECK(reader->ReadFullBoxHeader() &&
 681          reader->Read4(&sample_count));
 682   const uint32 flags = reader->flags();
 683
 684   bool data_offset_present = (flags & 0x1) != 0;
 685   bool first_sample_flags_present = (flags & 0x4) != 0;
 686   bool sample_duration_present = (flags & 0x100) != 0;
 687   bool sample_size_present = (flags & 0x200) != 0;
 688   bool sample_flags_present = (flags & 0x400) != 0;
 689   bool sample_composition_time_offsets_present = (flags & 0x800) != 0;
 690
 691   if (data_offset_present) {
 692     RCHECK(reader->Read4(&data_offset));
 693   } else {
 694     data_offset = 0;
 695   }
 696
 697   uint32 first_sample_flags;
 698   if (first_sample_flags_present)
 699     RCHECK(reader->Read4(&first_sample_flags));
 700
 701   int fields = sample_duration_present + sample_size_present +
 702       sample_flags_present + sample_composition_time_offsets_present;
 703   RCHECK(reader->HasBytes(fields * sample_count));
 704
 705   if (sample_duration_present)
 706     sample_durations.resize(sample_count);
 707   if (sample_size_present)
 708     sample_sizes.resize(sample_count);
 709   if (sample_flags_present)
 710     sample_flags.resize(sample_count);
 711   if (sample_composition_time_offsets_present)
 712     sample_composition_time_offsets.resize(sample_count);
 713
 714   for (uint32 i = 0; i < sample_count; ++i) {
 715     if (sample_duration_present)
 716       RCHECK(reader->Read4(&sample_durations[i]));
 717     if (sample_size_present)
 718       RCHECK(reader->Read4(&sample_sizes[i]));
 719     if (sample_flags_present)
 720       RCHECK(reader->Read4(&sample_flags[i]));
 721     if (sample_composition_time_offsets_present)
 722       RCHECK(reader->Read4s(&sample_composition_time_offsets[i]));
 723   }
 724
 725   if (first_sample_flags_present) {
 726     if (sample_flags.size() == 0) {
 727       sample_flags.push_back(first_sample_flags);
 728     } else {
 729       sample_flags[0] = first_sample_flags;
 730     }
 731   }
 732   return true;
 733 }
 734
 735 TrackFragment::TrackFragment() {}
 736 TrackFragment::~TrackFragment() {}
 737 FourCC TrackFragment::BoxType() const { return FOURCC_TRAF; }
 738
 739 bool TrackFragment::Parse(BoxReader* reader) {
 740   return reader->ScanChildren() &&
 741          reader->ReadChild(&header) &&
 742          // Media Source specific: 'tfdt' required
 743          reader->ReadChild(&decode_time) &&
 744          reader->MaybeReadChildren(&runs) &&
 745          reader->MaybeReadChild(&auxiliary_offset) &&
 746          reader->MaybeReadChild(&auxiliary_size) &&
 747          reader->MaybeReadChild(&sdtp);
 748 }
 749
 750 MovieFragment::MovieFragment() {}
 751 MovieFragment::~MovieFragment() {}
 752 FourCC MovieFragment::BoxType() const { return FOURCC_MOOF; }
 753
 754 bool MovieFragment::Parse(BoxReader* reader) {
 755   RCHECK(reader->ScanChildren() &&
 756          reader->ReadChild(&header) &&
 757          reader->ReadChildren(&tracks) &&
 758          reader->MaybeReadChildren(&pssh));
 759   return true;
 760 }
 761
 762 IndependentAndDisposableSamples::IndependentAndDisposableSamples() {}
 763 IndependentAndDisposableSamples::~IndependentAndDisposableSamples() {}
 764 FourCC IndependentAndDisposableSamples::BoxType() const { return FOURCC_SDTP; }
 765
 766 bool IndependentAndDisposableSamples::Parse(BoxReader* reader) {
 767   RCHECK(reader->ReadFullBoxHeader());
 768   RCHECK(reader->version() == 0);
 769   RCHECK(reader->flags() == 0);
 770
 771   int sample_count = reader->size() - reader->pos();
 772   sample_depends_on_.resize(sample_count);
 773   for (int i = 0; i < sample_count; ++i) {
 774     uint8 sample_info;
 775     RCHECK(reader->Read1(&sample_info));
 776     RCHECK((sample_info >> 6) == 0);  // reserved.
 777
 778     sample_depends_on_[i] =
 779         static_cast<SampleDependsOn>((sample_info >> 4) & 0x3);
 780
 781     RCHECK(sample_depends_on_[i] != kSampleDependsOnReserved);
 782   }
 783
 784   return true;
 785 }
 786
 787 SampleDependsOn IndependentAndDisposableSamples::sample_depends_on(
 788     size_t i) const {
 789   if (i >= sample_depends_on_.size())
 790     return kSampleDependsOnUnknown;
 791
 792   return sample_depends_on_[i];
 793 }
 794
 795 }  // namespace mp4
 796 }  // namespace media