box_definitions.h

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_FORMATS_MP4_BOX_DEFINITIONS_H_
#define MEDIA_FORMATS_MP4_BOX_DEFINITIONS_H_

#include <vector>

#include "packager/media/base/decrypt_config.h"
#include "packager/media/formats/mp4/aac_audio_specific_config.h"
#include "packager/media/formats/mp4/box.h"
#include "packager/media/formats/mp4/es_descriptor.h"
#include "packager/media/formats/mp4/fourccs.h"

namespace edash_packager {
namespace media {

class BufferReader;

namespace mp4 {

enum TrackType {
  kInvalid = 0,
  kVideo,
  kAudio,
  kHint,
  kText,
};

class BoxBuffer;

#define DECLARE_BOX_METHODS(T)                        \
 public:                                              \
  T();                                                \
  ~T() override;                                      \
  FourCC BoxType() const override;                    \
                                                      \
 private:                                             \
  bool ReadWriteInternal(BoxBuffer* buffer) override; \
  uint32_t ComputeSizeInternal() override;            \
                                                      \
 public:

struct FileType : Box {
  DECLARE_BOX_METHODS(FileType);

  FourCC major_brand;
  uint32_t minor_version;
  std::vector<FourCC> compatible_brands;
};

struct SegmentType : FileType {
  FourCC BoxType() const override;
};

struct ProtectionSystemSpecificHeader : FullBox {
  DECLARE_BOX_METHODS(ProtectionSystemSpecificHeader);

  std::vector<uint8_t> system_id;
  std::vector<uint8_t> data;
  std::vector<uint8_t> raw_box;
};

struct SampleAuxiliaryInformationOffset : FullBox {
  DECLARE_BOX_METHODS(SampleAuxiliaryInformationOffset);

  std::vector<uint64_t> offsets;
};

struct SampleAuxiliaryInformationSize : FullBox {
  DECLARE_BOX_METHODS(SampleAuxiliaryInformationSize);

  uint8_t default_sample_info_size;
  uint32_t sample_count;
  std::vector<uint8_t> sample_info_sizes;
};

struct SampleEncryptionEntry {
  SampleEncryptionEntry();
  ~SampleEncryptionEntry();
  bool ReadWrite(uint8_t iv_size,
                 bool has_subsamples,
                 BoxBuffer* buffer);
  bool ParseFromBuffer(uint8_t iv_size,
                       bool has_subsamples,
                       BufferReader* reader);
  uint32_t ComputeSize() const;
  uint32_t GetTotalSizeOfSubsamples() const;

  std::vector<uint8_t> initialization_vector;
  std::vector<SubsampleEntry> subsamples;
};

struct SampleEncryption : FullBox {
  enum SampleEncryptionFlags {
    kUseSubsampleEncryption = 2,
  };

  DECLARE_BOX_METHODS(SampleEncryption);
  bool ParseFromSampleEncryptionData(
      size_t iv_size,
      std::vector<SampleEncryptionEntry>* sample_encryption_entries) const;

  std::vector<uint8_t> sample_encryption_data;

  size_t iv_size;
  std::vector<SampleEncryptionEntry> sample_encryption_entries;
};

struct OriginalFormat : Box {
  DECLARE_BOX_METHODS(OriginalFormat);

  FourCC format;
};

struct SchemeType : FullBox {
  DECLARE_BOX_METHODS(SchemeType);

  FourCC type;
  uint32_t version;
};

struct TrackEncryption : FullBox {
  DECLARE_BOX_METHODS(TrackEncryption);

  // Note: this definition is specific to the CENC protection type.
  bool is_encrypted;
  uint8_t default_iv_size;
  std::vector<uint8_t> default_kid;
};

struct SchemeInfo : Box {
  DECLARE_BOX_METHODS(SchemeInfo);

  TrackEncryption track_encryption;
};

struct ProtectionSchemeInfo : Box {
  DECLARE_BOX_METHODS(ProtectionSchemeInfo);

  OriginalFormat format;
  SchemeType type;
  SchemeInfo info;
};

struct MovieHeader : FullBox {
  DECLARE_BOX_METHODS(MovieHeader);

  uint64_t creation_time;
  uint64_t modification_time;
  uint32_t timescale;
  uint64_t duration;
  int32_t rate;
  int16_t volume;
  uint32_t next_track_id;
};

struct TrackHeader : FullBox {
  enum TrackHeaderFlags {
    kTrackEnabled   = 0x000001,
    kTrackInMovie   = 0x000002,
    kTrackInPreview = 0x000004,
  };

  DECLARE_BOX_METHODS(TrackHeader);

  uint64_t creation_time;
  uint64_t modification_time;
  uint32_t track_id;
  uint64_t duration;
  int16_t layer;
  int16_t alternate_group;
  int16_t volume;
  // width and height specify the track's visual presentation size as
  // fixed-point 16.16 values.
  uint32_t width;
  uint32_t height;
};

struct EditListEntry {
  uint64_t segment_duration;
  int64_t media_time;
  int16_t media_rate_integer;
  int16_t media_rate_fraction;
};

struct EditList : FullBox {
  DECLARE_BOX_METHODS(EditList);

  std::vector<EditListEntry> edits;
};

struct Edit : Box {
  DECLARE_BOX_METHODS(Edit);

  EditList list;
};

struct HandlerReference : FullBox {
  DECLARE_BOX_METHODS(HandlerReference);

  FourCC handler_type;
};

struct Language {
  bool ReadWrite(BoxBuffer* buffer);
  uint32_t ComputeSize() const;

  std::string code;
};

struct PrivFrame {
  bool ReadWrite(BoxBuffer* buffer);
  uint32_t ComputeSize() const;

  std::string owner;
  std::string value;
};

struct ID3v2 : FullBox {
  DECLARE_BOX_METHODS(ID3v2);

  Language language;

  PrivFrame private_frame;
};

struct Metadata : FullBox {
  DECLARE_BOX_METHODS(Metadata);

  HandlerReference handler;
  ID3v2 id3v2;
};

struct CodecConfigurationRecord : Box {
  DECLARE_BOX_METHODS(CodecConfigurationRecord);

  FourCC box_type;
  // Contains full codec configuration record, including possible extension
  // boxes.
  std::vector<uint8_t> data;
};

struct PixelAspectRatio : Box {
  DECLARE_BOX_METHODS(PixelAspectRatio);

  uint32_t h_spacing;
  uint32_t v_spacing;
};

struct VideoSampleEntry : Box {
  DECLARE_BOX_METHODS(VideoSampleEntry);
  // Returns actual format of this sample entry.
  FourCC GetActualFormat() const {
    return format == FOURCC_ENCV ? sinf.format.format : format;
  }

  FourCC format;
  uint16_t data_reference_index;
  uint16_t width;
  uint16_t height;

  PixelAspectRatio pixel_aspect;
  ProtectionSchemeInfo sinf;
  CodecConfigurationRecord codec_config_record;
};

struct ElementaryStreamDescriptor : FullBox {
  DECLARE_BOX_METHODS(ElementaryStreamDescriptor);

  AACAudioSpecificConfig aac_audio_specific_config;
  ESDescriptor es_descriptor;
};

struct DTSSpecific : Box {
  DECLARE_BOX_METHODS(DTSSpecific);

  uint32_t sampling_frequency;
  uint32_t max_bitrate;
  uint32_t avg_bitrate;
  uint8_t pcm_sample_depth;
  std::vector<uint8_t> extra_data;
};

struct AC3Specific : Box {
  DECLARE_BOX_METHODS(AC3Specific);

  std::vector<uint8_t> data;
};

// Independent substream in EC3Specific box.
struct IndependentSubstream {
  uint8_t sample_rate_code;             // fscod: 2 bits
  uint8_t bit_stream_identification;    // bsid: 5 bits
  // reserved_1: 1 bit
  uint8_t audio_service;                // asvc: 1 bit
  uint8_t bit_stream_mode;              // bsmod: 3 bits
  uint8_t audio_coding_mode;            // acmod: 3 bits
  uint8_t lfe_channel_on;               // lfeon: 1 bit
  // reserved_2: 3 bit
  uint8_t number_dependent_substreams;  // num_dep_sub: 4 bits.
  // If num_dep_sub > 0, chan_loc is present and the size is 9 bits.
  // Otherwise, reserved_3 is present and the size is 1 bit.
  uint16_t channel_location;            // chan_loc: 9 bits.
  // reserved_3: 1 bit
};

struct EC3Specific : Box {
  DECLARE_BOX_METHODS(EC3Specific);

  // Before we know the number of independent substreams, data in EC3Specific
  // box is store for parsing later.
  std::vector<uint8_t> data;

  size_t number_independent_substreams;  // num_id_sub: 3 bits.
  std::vector<IndependentSubstream> independent_substreams;
};

struct AudioSampleEntry : Box {
  DECLARE_BOX_METHODS(AudioSampleEntry);
  // Returns actual format of this sample entry.
  FourCC GetActualFormat() const {
    return format == FOURCC_ENCA ? sinf.format.format : format;
  }

  FourCC format;
  uint16_t data_reference_index;
  uint16_t channelcount;
  uint16_t samplesize;
  uint32_t samplerate;

  ProtectionSchemeInfo sinf;

  ElementaryStreamDescriptor esds;
  DTSSpecific ddts;
  AC3Specific dac3;
  EC3Specific dec3;
};

struct WebVTTConfigurationBox : Box {
  DECLARE_BOX_METHODS(WebVTTConfigurationBox);
  std::string config;
};

struct WebVTTSourceLabelBox : Box {
  DECLARE_BOX_METHODS(WebVTTSourceLabelBox);
  std::string source_label;
};

struct TextSampleEntry : Box {
  DECLARE_BOX_METHODS(TextSampleEntry);

  // Specifies fourcc of this sample entry. It needs to be set on write, e.g.
  // set to 'wvtt' to write WVTTSampleEntry; On read, it is recovered from box
  // header.
  FourCC format;
  uint16_t data_reference_index;

  // Sub boxes for wvtt text sample entry.
  WebVTTConfigurationBox config;
  WebVTTSourceLabelBox label;
  // Optional MPEG4BitRateBox.
};

struct SampleDescription : FullBox {
  DECLARE_BOX_METHODS(SampleDescription);

  TrackType type;
  // TODO(kqyang): Clean up the code to have one single member, e.g. by creating
  // SampleEntry struct, std::vector<SampleEntry> sample_entries.
  std::vector<VideoSampleEntry> video_entries;
  std::vector<AudioSampleEntry> audio_entries;
  std::vector<TextSampleEntry> text_entries;
};

struct DecodingTime {
  uint32_t sample_count;
  uint32_t sample_delta;
};

// stts.
struct DecodingTimeToSample : FullBox {
  DECLARE_BOX_METHODS(DecodingTimeToSample);

  std::vector<DecodingTime> decoding_time;
};

struct CompositionOffset {
  uint32_t sample_count;
  // If version == 0, sample_offset is uint32_t;
  // If version == 1, sample_offset is int32_t.
  // Use int64_t so both can be supported properly.
  int64_t sample_offset;
};

// ctts. Optional.
struct CompositionTimeToSample : FullBox {
  DECLARE_BOX_METHODS(CompositionTimeToSample);

  std::vector<CompositionOffset> composition_offset;
};

struct ChunkInfo {
  uint32_t first_chunk;
  uint32_t samples_per_chunk;
  uint32_t sample_description_index;
};

// stsc.
struct SampleToChunk : FullBox {
  DECLARE_BOX_METHODS(SampleToChunk);

  std::vector<ChunkInfo> chunk_info;
};

// stsz.
struct SampleSize : FullBox {
  DECLARE_BOX_METHODS(SampleSize);

  uint32_t sample_size;
  uint32_t sample_count;
  std::vector<uint32_t> sizes;
};

// stz2.
struct CompactSampleSize : FullBox {
  DECLARE_BOX_METHODS(CompactSampleSize);

  uint8_t field_size;
  std::vector<uint32_t> sizes;
};

// co64.
struct ChunkLargeOffset : FullBox {
  DECLARE_BOX_METHODS(ChunkLargeOffset);

  std::vector<uint64_t> offsets;
};

// stco.
struct ChunkOffset : ChunkLargeOffset {
  DECLARE_BOX_METHODS(ChunkOffset);
};

// stss. Optional.
struct SyncSample : FullBox {
  DECLARE_BOX_METHODS(SyncSample);

  std::vector<uint32_t> sample_number;
};

struct SampleTable : Box {
  DECLARE_BOX_METHODS(SampleTable);

  SampleDescription description;
  DecodingTimeToSample decoding_time_to_sample;
  CompositionTimeToSample composition_time_to_sample;
  SampleToChunk sample_to_chunk;
  // Either SampleSize or CompactSampleSize must present. Store in SampleSize.
  SampleSize sample_size;
  // Either ChunkOffset or ChunkLargeOffset must present. Store in
  // ChunkLargeOffset.
  ChunkLargeOffset chunk_large_offset;
  SyncSample sync_sample;
};

struct MediaHeader : FullBox {
  DECLARE_BOX_METHODS(MediaHeader);

  uint64_t creation_time;
  uint64_t modification_time;
  uint32_t timescale;
  uint64_t duration;
  Language language;
};

struct VideoMediaHeader : FullBox {
  DECLARE_BOX_METHODS(VideoMediaHeader);

  uint16_t graphicsmode;
  uint16_t opcolor_red;
  uint16_t opcolor_green;
  uint16_t opcolor_blue;
};

struct SoundMediaHeader : FullBox {
  DECLARE_BOX_METHODS(SoundMediaHeader);

  uint16_t balance;
};

struct SubtitleMediaHeader : FullBox {
  DECLARE_BOX_METHODS(SubtitleMediaHeader);
};

struct DataEntryUrl : FullBox {
  DECLARE_BOX_METHODS(DataEntryUrl);

  std::vector<uint8_t> location;
};

struct DataReference : FullBox {
  DECLARE_BOX_METHODS(DataReference);

  // data entry can be either url or urn box. Fix to url box for now.
  std::vector<DataEntryUrl> data_entry;
};

struct DataInformation : Box {
  DECLARE_BOX_METHODS(DataInformation);

  DataReference dref;
};

struct MediaInformation : Box {
  DECLARE_BOX_METHODS(MediaInformation);

  DataInformation dinf;
  SampleTable sample_table;
  // Exactly one specific meida header shall be present, vmhd, smhd, hmhd, nmhd.
  VideoMediaHeader vmhd;
  SoundMediaHeader smhd;
  SubtitleMediaHeader sthd;
};

struct Media : Box {
  DECLARE_BOX_METHODS(Media);

  MediaHeader header;
  HandlerReference handler;
  MediaInformation information;
};

struct Track : Box {
  DECLARE_BOX_METHODS(Track);

  TrackHeader header;
  Media media;
  Edit edit;
  SampleEncryption sample_encryption;
};

struct MovieExtendsHeader : FullBox {
  DECLARE_BOX_METHODS(MovieExtendsHeader);

  uint64_t fragment_duration;
};

struct TrackExtends : FullBox {
  DECLARE_BOX_METHODS(TrackExtends);

  uint32_t track_id;
  uint32_t default_sample_description_index;
  uint32_t default_sample_duration;
  uint32_t default_sample_size;
  uint32_t default_sample_flags;
};

struct MovieExtends : Box {
  DECLARE_BOX_METHODS(MovieExtends);

  MovieExtendsHeader header;
  std::vector<TrackExtends> tracks;
};

struct Movie : Box {
  DECLARE_BOX_METHODS(Movie);

  MovieHeader header;
  Metadata metadata;  // Used to hold version information.
  MovieExtends extends;
  std::vector<Track> tracks;
  std::vector<ProtectionSystemSpecificHeader> pssh;
};

struct TrackFragmentDecodeTime : FullBox {
  DECLARE_BOX_METHODS(TrackFragmentDecodeTime);

  uint64_t decode_time;
};

struct MovieFragmentHeader : FullBox {
  DECLARE_BOX_METHODS(MovieFragmentHeader);

  uint32_t sequence_number;
};

struct TrackFragmentHeader : FullBox {
  enum TrackFragmentFlagsMasks {
    kBaseDataOffsetPresentMask          = 0x000001,
    kSampleDescriptionIndexPresentMask  = 0x000002,
    kDefaultSampleDurationPresentMask   = 0x000008,
    kDefaultSampleSizePresentMask       = 0x000010,
    kDefaultSampleFlagsPresentMask      = 0x000020,
    kDurationIsEmptyMask                = 0x010000,
    kDefaultBaseIsMoofMask              = 0x020000,
  };

  enum SampleFlagsMasks {
    kReservedMask                  = 0xFC000000,
    kSampleDependsOnMask           = 0x03000000,
    kSampleIsDependedOnMask        = 0x00C00000,
    kSampleHasRedundancyMask       = 0x00300000,
    kSamplePaddingValueMask        = 0x000E0000,
    kNonKeySampleMask              = 0x00010000,
    kSampleDegradationPriorityMask = 0x0000FFFF,
  };

  DECLARE_BOX_METHODS(TrackFragmentHeader);

  uint32_t track_id;
  uint32_t sample_description_index;
  uint32_t default_sample_duration;
  uint32_t default_sample_size;
  uint32_t default_sample_flags;
};

struct TrackFragmentRun : FullBox {
  enum TrackFragmentFlagsMasks {
    kDataOffsetPresentMask              = 0x000001,
    kFirstSampleFlagsPresentMask        = 0x000004,
    kSampleDurationPresentMask          = 0x000100,
    kSampleSizePresentMask              = 0x000200,
    kSampleFlagsPresentMask             = 0x000400,
    kSampleCompTimeOffsetsPresentMask   = 0x000800,
  };

  DECLARE_BOX_METHODS(TrackFragmentRun);

  uint32_t sample_count;
  uint32_t data_offset;
  std::vector<uint32_t> sample_flags;
  std::vector<uint32_t> sample_sizes;
  std::vector<uint32_t> sample_durations;
  std::vector<int64_t> sample_composition_time_offsets;
};

struct SampleToGroupEntry {
  enum GroupDescriptionIndexBase {
    kTrackGroupDescriptionIndexBase = 0,
    kTrackFragmentGroupDescriptionIndexBase = 0x10000,
  };

  uint32_t sample_count;
  uint32_t group_description_index;
};

struct SampleToGroup : FullBox {
  DECLARE_BOX_METHODS(SampleToGroup);

  uint32_t grouping_type;
  uint32_t grouping_type_parameter;  // Version 1 only.
  std::vector<SampleToGroupEntry> entries;
};

struct CencSampleEncryptionInfoEntry {
  CencSampleEncryptionInfoEntry();
  ~CencSampleEncryptionInfoEntry();

  bool is_encrypted;
  uint8_t iv_size;
  std::vector<uint8_t> key_id;
};

struct SampleGroupDescription : FullBox {
  DECLARE_BOX_METHODS(SampleGroupDescription);

  uint32_t grouping_type;
  std::vector<CencSampleEncryptionInfoEntry> entries;
};

struct TrackFragment : Box {
  DECLARE_BOX_METHODS(TrackFragment);

  TrackFragmentHeader header;
  std::vector<TrackFragmentRun> runs;
  bool decode_time_absent;
  TrackFragmentDecodeTime decode_time;
  SampleToGroup sample_to_group;
  SampleGroupDescription sample_group_description;
  SampleAuxiliaryInformationSize auxiliary_size;
  SampleAuxiliaryInformationOffset auxiliary_offset;
  SampleEncryption sample_encryption;
};

struct MovieFragment : Box {
  DECLARE_BOX_METHODS(MovieFragment);

  MovieFragmentHeader header;
  std::vector<TrackFragment> tracks;
  std::vector<ProtectionSystemSpecificHeader> pssh;
};

struct SegmentReference {
  enum SAPType {
    TypeUnknown = 0,
    Type1 = 1,  // T(ept) = T(dec) = T(sap) = T(ptf)
    Type2 = 2,  // T(ept) = T(dec) = T(sap) < T(ptf)
    Type3 = 3,  // T(ept) < T(dec) = T(sap) <= T(ptf)
    Type4 = 4,  // T(ept) <= T(ptf) < T(dec) = T(sap)
    Type5 = 5,  // T(ept) = T(dec) < T(sap)
    Type6 = 6,  // T(ept) < T(dec) < T(sap)
  };

  bool reference_type;
  uint32_t referenced_size;
  uint32_t subsegment_duration;
  bool starts_with_sap;
  SAPType sap_type;
  uint32_t sap_delta_time;
  // We add this field to keep track of earliest_presentation_time in this
  // subsegment. It is not part of SegmentReference.
  uint64_t earliest_presentation_time;
};

struct SegmentIndex : FullBox {
  DECLARE_BOX_METHODS(SegmentIndex);

  uint32_t reference_id;
  uint32_t timescale;
  uint64_t earliest_presentation_time;
  uint64_t first_offset;
  std::vector<SegmentReference> references;
};

// The actual data is parsed and written separately.
struct MediaData : Box {
  DECLARE_BOX_METHODS(MediaData);

  uint32_t data_size;
};

struct CueSourceIDBox : Box {
  DECLARE_BOX_METHODS(CueSourceIDBox);
  int32_t source_id;
};

struct CueTimeBox : Box {
  DECLARE_BOX_METHODS(CueTimeBox);
  std::string cue_current_time;
};

struct CueIDBox : Box {
  DECLARE_BOX_METHODS(CueIDBox);
  std::string cue_id;
};

struct CueSettingsBox : Box {
  DECLARE_BOX_METHODS(CueSettingsBox);
  std::string settings;
};

struct CuePayloadBox : Box {
  DECLARE_BOX_METHODS(CuePayloadBox);
  std::string cue_text;
};

struct VTTEmptyCueBox : Box {
  DECLARE_BOX_METHODS(VTTEmptyCueBox);
};

struct VTTAdditionalTextBox : Box {
  DECLARE_BOX_METHODS(VTTAdditionalTextBox);
  std::string cue_additional_text;
};

struct VTTCueBox : Box {
  DECLARE_BOX_METHODS(VTTCueBox);

  CueSourceIDBox cue_source_id;
  CueIDBox cue_id;
  CueTimeBox cue_time;
  CueSettingsBox cue_settings;
  CuePayloadBox cue_payload;
};

#undef DECLARE_BOX

}  // namespace mp4
}  // namespace media
}  // namespace edash_packager

#endif  // MEDIA_FORMATS_MP4_BOX_DEFINITIONS_H_