JP7133038B2 - メディアコンテンツを送信する方法、装置及びコンピュータプログラム - Google Patents
メディアコンテンツを送信する方法、装置及びコンピュータプログラム Download PDFInfo
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Description
ボックスタイプ: ‘trgr’
コンテナ: TrackBox(‘trak’)
必須: No
数量: 0又は1
aligned(8) class TrackGroupBox extends Box(‘trgr’) {
}
このトラックグループボックスは、以下のように定義されたトラックグループタイプボックスのセットを含むことができる:
aligned(8) class TrackGroupTypeBox(unsigned int(32) track_group_type)
extends FullBox(track_group_type, version = 0, flags = 0)
{
unsigned int(32) track_group_id;
// 残りのデータは特定のtrack_group_typeに指定されてよい
track_group_type
}
aligned(8) class SpatialRelationship2DSourceBox
extends FullBox(‘2dsr’, 0, 0) {
unsigned int(32) total_width;
unsigned int(32) total_height;
unsigned int(32) source_id;
}
aligned(8) class SubPictureRegionBox extends FullBox(‘sprg’,0,0) {
unsigned int(16) object_x;
unsigned int(16) object_y;
unsigned int(16) object_width;
unsigned int(16) object_height;
}
aligned(8) class SpatialRelationship2DDescriptionBox extends TrackGroupTypeBox(‘2dcc’)
{
//track_group_idは、TrackGroupTypeBoxから引き継がれる;
SpatialRelationship2DSourceBox(); // 必須、最初でなければならない
SubPictureRegionBox (); // オプション
}
ここで、object_xは、トラックグループを囲むことにより、指定された領域内のトラックの左上角の水平位置を指定する。
class SpatialRelationship2DGroupEntry () extends VisualSampleGroupEntry (‘2dcc’) {
unsigned int(16) object_x;
unsigned int(16) object_y;
unsigned int(16) object_width;
unsigned int(16) object_height;
ここで、object_xは、対応する空間関係トラックグループによって指定される座標系内のこのグループ内のサンプルの左上角の水平位置を指定する。
aligned(8) class EntityToGroupBox(grouping_type, version, flags) extends FullBox(grouping_type, version, flags) {
unsigned int(32) group_id;
unsigned int(32) num_entities_in_group;
for(i=0; i<num_entities_in_group; i++)
unsigned int(32) entity_id;
// 残りのデータは特定のgrouping_typeに対して指定され得る
}
aligned(8) class EntityToGroupBox(‘egco', version, flags)
extends FullBox(‘egco', version, flags) {
unsigned int(32) group_id;
unsigned int(32) num_entities_in_group;
for(i=0; i<num_entities_in_group; i++)
unsigned int(32) entity_id;
unsigned int(16) total_width;
unsigned int(16) total_height;
unsigned int(32) source_id;
}
ここで、total_width及びtotal_heightは、合成サイズを備え、source_idはソースに対する一意の識別子を備え、ソースに関連付けられた座標系(つまり、原点(0,0)及びそれらの軸の方向) を黙示的に定義する。
aligned(8) class SubPictureRegionBox extends FullBox(‘sprg',0,0) {
unsigned int(16) object_x;
unsigned int(16) object_y;
unsigned int(16) object_width;
unsigned int(16) object_height;
}
aligned(8) class SpatialRelationship2DDescriptionBox extends TrackGroupTypeBox(‘2dcc')
{
// track_group_idはTrackGroupTypeBoxから引き継がれる;
SubPictureRegionBox ();
}
ここで、object_x、object_y、object_width、object_heightは、合成内の各トラックの相対的な2次元座標を備える。
aligned(8) class 2DCoordinateForEntityGroupBox extends FullBox(‘2dco', version, flags)
{
unsigned int(32) entity_group_id;
unsigned int(16) object_x;
unsigned int(16) object_y;
unsigned int(16) object_width;
unsigned int(16) object_height;
}
class 2DCoordinateForEntityGroupBox extends VisualSampleGroupEntry('2dco')
{
unsigned int(32) entity_group_id;
unsigned int(16) object_x;
unsigned int(16) object_y;
unsigned int(16) object_width;
unsigned int(16) object_height;
}
aligned(8) class RegionWisePackingStruct() {
unsigned int(1) constituent_picture_matching_flag;
bit(7) reserved = 0;
unsigned int(8) num_regions;
unsigned int(32) proj_picture_width;
unsigned int(32) proj_picture_height;
unsigned int(16) packed_picture_width;
unsigned int(16) packed_picture_height;
for (i = 0; i < num_regions; i++) {
bit(3) reserved = 0;
unsigned int(1) guard_band_flag[i];
unsigned int(4) packing_type[i];
if (packing_type[i] == 0) {
RectRegionPacking(i);
if (guard_band_flag[i])
GuardBand(i);
}
}
}
ここで、proj_picture_width及びproj_picture_heightは、相対的投影ピクチャサンプルユニットにおける投影ピクチャの幅及び高さをそれぞれ指定し、packed_picture_width及びpacked_picture_heightは、相対的パック化ピクチャサンプルユニットにおけるパック化ピクチャの幅及び高さをそれぞれ指定し、num_regionは、constituent_picture_matching_flagが0に等しい場合のパックされた領域の数を指定する。
ボックスタイプ: ‘covi’
コンテナ: 投影全方向ビデオボックス(‘povd’)又はSpatialRelationship2DDescriptionBox(‘2dcc’)
必須: No
数量: 0又は1
aligned(8) class CoverageInformationBox extends FullBox(‘covi', 0, 0) {
ContentCoverageStruct()
}
ここで、ContentCoverageStructは、SphereRegionStruct()で記述されるカバー領域の数を以下の通り指定する。
signed int(32) centre_azimuth;
signed int(32) centre_elevation;
signed int(32) centre_tilt;
if (range_included_flag) {
unsigned int(32) azimuth_range;
unsigned int(32) elevation_range;
}
unsigned int(1) interpolate;
bit(7) reserved = 0;
}
aligned(8) class ContentCoverageStruct() {
unsigned int(8) coverage_shape_type;
unsigned int(8) num_regions;
unsigned int(1) view_idc_presence_flag;
if (view_idc_presence_flag == 0) {
unsigned int(2) default_view_idc;
bit(5) reserved = 0;
} else
bit(7) reserved = 0;
for ( i = 0; i < num_regions; i++) {
if (view_idc_presence_flag == 1) {
unsigned int(2) view_idc[i];
bit(6) reserved = 0;
}
SphereRegionStruct(1);
}
}
aligned(8) class SpatialRelationship2DDescriptionBox extends TrackGroupTypeBox(‘2dcc')
{
// track_group_idは、TrackGroupTypeBoxから引き継がれる;
SpatialRelationship2DSourceBox(); // 必須、最初でなければならない
SubPictureRegionBox (); // オプション
CoverageInformationBox(); // オプション
}
ボックスタイプ: ‘covi’
コンテナ : 投影全方向ビデオボックス(‘povd’)
必須 : No
数量 : 0又は1
aligned(8) class CoverageInformationBox extends FullBox(‘covi', 0, 0) {
ContentCoverageStruct()
}
aligned(8) class SpatialRelationship2DDescriptionBox extends TrackGroupTypeBox(‘2dcc’) {
// track_group_idはTrackGroupTypeBoxから引き継がれる;
SpatialRelationship2DSourceBox(); // 必須、最初でなければならない
SubPictureRegionBox (); // オプション
SphericalRegionBox (); // オプション
ここで、SpatialRelationship2DSourceBox及びSubPictureRegionBoxは、トラックグループに関連するサブピクチャトラックの2D座標系及びそれらの位置及びサイズをそれぞれ記述する。SphericalRegionBoxは以下のように定義される新しいボックスである(4文字コードは単なる一例であり、任意の4文字コードは、それが球領域の表示のために確保されている場合、使用されてよい)。
aligned(8) class SphericalRegionBox extends FullBox('sspr', 0, 0) {
SphereRegionStruct(1);
}
ここで、SphereRegionStructは、方位角(垂直)及び仰角(水平)次元についての範囲を有する三重項(centre_azimuth、center_elevation、center_pitch)又は(ヨー、ピッチ、ロール)として球領域を指定する。
aligned(8) class SpatialRelationship2DDescriptionBox extends TrackGroupTypeBox(‘2dcc')
{
// track_group_id はTrackGroupTypeBox から引き継がれる;
SpatialRelationship2DSourceBox(); // 必須、最初でなければならない
SubPictureRegionBox (); // オプション
}
aligned(8) class SpatialRelationship2DSourceBox extends
FullBox(‘2dsr', 0, 0)
unsigned int(32) total_width;
unsigned int(32) total_height;
unsigned int(32) source_id;
unsigned int(1) reference_picture;
unsigned int(31) reserved
}
{
// track_group_id はTrackGroupTypeBox から引き継がれる
SpatialRelationship2DSourceBox(flags); // 必須、最初でなければならない
SubPictureRegionBox (); // オプション
}
aligned(8) class SpatialRelationship2DSourceBox extends
FullBox('2dsr', 0, flags) {
unsigned int(32) total_width;
unsigned int(32) total_height;
unsigned int(32) source_id;
if ( (flags & 0x01) == 1) {
unsigned int(1) reference_picture;
unsigned int(31) reserved
}
}
ここで、reference_pictureは、値「0」を取る場合、このグループ内のサブピクチャトラックのための位置が投影ピクチャ座標系で表されることを示す、新しいパラメータである。例として、パラメータの名前が付与される。なお、total_width及びtotal_heightは、それぞれ投影画像の幅及び高さを示す。
aligned(8) class ExplicitSpatialRelationship2DDescriptionBox extends TrackGroupTypeBox(‘edcc', 0, flags)
{
// track_group_id はTrackGroupTypeBoxから引き継がれる;
ExplicitSpatialRelationship2DSourceBox(flags); // 必須、最初でなければならない
SubPictureRegionBox (); // オプション
aligned(8) class ExplicitSpatialRelationship2DSourceBox extends
FullBox(‘edsr', 0, flags) {
unsigned int(32) total_width;
unsigned int(32) total_height;
unsigned int(32) source_id;
unsigned int(8) reference_picture;
}
Claims (9)
- ISOBMFFと互換性があるファイルフォーマットにおける符号化メディアデータをカプセル化する方法であって、
前記符号化メディアデータはシーンのワイドビューに対応し、前記ワイドビューは球面の少なくとも一部に前記シーンの画像を投影したものであり、
前記方法は、
前記シーンの前記ワイドビューを平面上に投影した投影ピクチャを得ることと、
前記投影ピクチャを複数のサブピクチャに分割することと、
少なくとも1つのサブピクチャを符号化したデータを複数のトラックに格納することと、
前記複数のトラックが属するトラックグループに関連付けられた記述メタデータを生成することと、
を有し、
前記記述メタデータは、
符号化された前記少なくとも1つのサブピクチャと前記複数のトラックのサブピクチャを合成した合成ピクチャとの間の空間関係を示す各トラックに関連付けられた第1の情報と、
前記合成ピクチャが領域的パックされているか否かを4文字コードによって示す第2の情報と、
を有する、
ことを特徴とする方法。 - 前記領域的パックは、前記投影ピクチャをマッピングするために適用される、
ことを特徴とする請求項1に記載の方法。 - ISOBMFFと互換性があるファイルフォーマットにおける符号化メディアデータを処理する方法であって、
前記符号化メディアデータはシーンのワイドビューに対応し、前記ワイドビューは球面の少なくとも一部に前記シーンの画像を投影したものであり、
前記方法は、
前記シーンの前記ワイドビューを平面上に投影した投影ピクチャの分割から生じる少なくとも1つのサブピクチャを符号化したデータが格納された複数のトラックが属するトラックグループを識別することと、
前記トラックグループに関連付けられた記述メタデータを識別することと、を有し、
記述メタデータは、
符号化された前記少なくとも1つのサブピクチャと前記複数のトラックのサブピクチャを合成した合成ピクチャとの間の空間関係を示す各トラックに関連付けられた第1の情報と、
前記合成ピクチャが領域的パックされているか否かを4文字コードによって示す第2の情報と、
を有する、
ことを特徴とする方法。 - 前記領域的パックは、前記投影ピクチャをマッピングするために適用される、
ことを特徴とする請求項3に記載の方法。 - ISOBMFFと互換性があるファイルフォーマットにおける符号化メディアデータをカプセル化するデバイスであって、
前記符号化メディアデータはシーンのワイドビューに対応し、前記ワイドビューは球面の少なくとも一部に前記シーンの画像を投影したものであり、
前記デバイスは、
前記シーンの前記ワイドビューを平面上に投影した投影ピクチャを取得する手段と、
前記投影ピクチャを複数のサブピクチャに分割する手段と、
少なくとも1つのサブピクチャを符号化したデータを複数のトラックに格納する手段と、
前記複数のトラックが属するトラックグループに関連付けられた記述メタデータを生成する手段と、
を有し、
前記記述メタデータは、
符号化された前記少なくとも1つのサブピクチャと前記複数のトラックのサブピクチャを合成した合成ピクチャとの間の空間関係を示す各トラックに関連付けられた第1の情報と、
前記合成ピクチャが領域的パックされているか否かを4文字コードによって示す第2の情報と、
を有する、
ことを特徴とするデバイス。 - ISOBMFFと互換性があるファイルフォーマットにおける符号化メディアデータを処理するデバイスであって、
前記符号化メディアデータはシーンのワイドビューに対応し、前記ワイドビューは球面の少なくとも一部に前記シーンの画像を投影したものであり、
前記デバイスは、
前記シーンの前記ワイドビューを平面上に投影した投影ピクチャの分割から生じる少なくとも1つのサブピクチャを符号化したデータが格納された複数のトラックが属するトラックグループを識別する手段と、
前記トラックグループに関連付けられた記述メタデータを識別する手段と、を有し、
前記記述メタデータは、
符号化された前記少なくとも1つのサブピクチャと前記複数のトラックのサブピクチャを合成した合成ピクチャとの間の空間関係を示す各トラックに関連付けられた第1の情報と、
前記合成ピクチャが領域的パックされているか否かを4文字コードによって示す第2の情報と、
を有する、
ことを特徴とするデバイス。 - 前記領域的パックは、前記投影ピクチャをマッピングするために適用されることを特徴とする、
請求項5又は6に記載のデバイス。 - コンピュータに、請求項1から4のいずれか一項に記載の方法を実行させるためのプログラム。
- 請求項8に記載のプログラムを記憶したコンピュータで読み取り可能な記憶媒体。
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US11245926B2 (en) * | 2019-03-19 | 2022-02-08 | Mediatek Singapore Pte. Ltd. | Methods and apparatus for track derivation for immersive media data tracks |
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