JP4827934B2 - データ記録方法、データ編集方法およびデータ復号方法、並びにその装置、及び記録媒体 - Google Patents
データ記録方法、データ編集方法およびデータ復号方法、並びにその装置、及び記録媒体 Download PDFInfo
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Description
<システム構成>
図1は本実施形態において共通に用いる、アフレコ可能なビデオディスクレコーダの構成である。この装置は、図1に示すように、バス100、ホストCPU101、RAM102、ROM103、ユーザインタフェース104、システムクロック105、光ディスク106、ピックアップ107、ECCデコーダ108、ECCエンコーダ109、再生用バッファ110、記録/アフレコ用バッファ111、デマルチプレクサ112、マルチプレクサ113、多重化用バッファ114、オーディオデコーダ115、ビデオデコーダ116、オーディオエンコーダ117、ビデオエンコーダ118および図示されないカメラ、マイク、スピーカ、ディスプレイ等で構成される。
光ディスク106上の各種情報を管理するためにファイルシステムを用いる。ファイルシステムには、PCとの相互運用を考慮してUDF(Universal Disk Format)を使用する。ファイルシステム上では、各種管理情報やAVストリームはファイルとして扱われる。ユーザエリアは、2048byteの論理ブロック(セクタと一対一対応)で管理される。
AVストリーム管理のためのフォーマットとして、QuickTimeファイルフォーマットを用いる。QuickTimeファイルフォーマットとは、Apple社が開発したマルチメディアデータ管理用フォーマットであり、PCの世界で広く用いられている。
ディスク内に含まれるQuickTimeムービーを管理するため、AVインデックス・ファイルという特別のQuickTimeムービーファイルをディスク内に1個置く。AVインデックス・ファイルには、ディスク内のファイル(QuickTimeムービーやQuickTimeムービーから参照されている静止画等)に関するサムネイルや各種属性が登録されている。
本発明の一実施例について、図13乃至図21を用いて説明する。
<AVストリームの形態>
本実施例におけるAVストリームの構成を、図13及び図14とともに説明する。AVストリームは、整数個のRecord Unit(RU)で構成される。RUはディスク上で連続的に記録する単位である。RUの長さは、AVストリームを構成するRUをどのようにディスク上に配置してもシームレス再生(再生中に絵や音が途切れないで再生できること)が保証されるように設定される。この設定方法については後述する。
AVストリームの管理方法は、前述のQuickTimeファイルフォーマットをベースにしている。図15にQuickTimeによるAVストリーム管理形態を示す。AAUをオーディオデータのサンプル、Sequence headerと整数個のGOPをビデオデータのサンプルとし、VU中のメインオーディオとビデオの塊をそれぞれ1チャンクに対応させる。
AVストリームのディスク上での配置決定方法について説明する。シームレス再生を保証するためには、次へのRUへのジャンプ時間も含めたRU読み出し時間がRUの再生時間より小さければよい。
ユーザから録画が指示された場合の処理を、図16に沿って説明する。このとき記録するAVストリームは、ビデオのビットレートRv=5Mbps、オーディオのサンプリング周波数48kHz、ビットレートRa=Rp=256kbpsであるものとする。すでに、ファイルシステムの管理情報はRAM上に読み込まれているとする。
AVストリームの途中をRU単位で削除することを考える。前述のように、RUの境界はECCブロック境界と一致する。さらに、ECCブロックは16セクタで構成され、セクタと論理ブロックは一致する。したがって、ファイルシステム管理情報とQuickTime管理情報を書き換えるのみで、RU単位の削除が可能である。
ユーザから再生が指示された場合の処理を、図21に沿って説明する。ここでは、すでに再生の対象となるAVストリームに関するQuickTime管理情報がRAM102に読み込まれているものとする。
101 ホストCPU
106 光ディスク
108 ECCデコーダ
109 ECCエンコーダ
112 デマルチプレクサ
113 マルチプレクサ
115 オーディオデコーダ
116 ビデオデコーダ
117 オーディオエンコーダ
118 ビデオエンコーダ
Claims (1)
- 少なくとも映像データを含むAVストリームと、
前記AVストリームに関するプログラム情報と、
前記AVストリームと前記プログラム情報を各々ファイルとして管理するためのファイルシステム管理情報と、
を記録媒体に記録するデータ記録方法であって、
前記AVストリームは、1個のファイルとして管理され、
前記プログラム情報は、前記AVストリーム内の連続的に再生可能な第1の区間に対応する第1のトラック情報を含んでおり、
前記方法は、
前記第1の区間から第2の区間を削除するステップと、
前記AVストリーム内で前記削除した第2の区間の直前と直後の位置を繋ぎ合わせるように、前記ファイルシステム管理情報を書き換える第1の書き換えるステップと、
繋ぎ目を示すために、前記繋ぎ目の前後で別のトラック情報に切り替わるように前記プログラム情報を書き換える第2の書き換えるステップと、
を有することを特徴とするデータ記録方法。
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JP2009000870A JP4827934B2 (ja) | 2001-06-15 | 2009-01-06 | データ記録方法、データ編集方法およびデータ復号方法、並びにその装置、及び記録媒体 |
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JP2009000870A JP4827934B2 (ja) | 2001-06-15 | 2009-01-06 | データ記録方法、データ編集方法およびデータ復号方法、並びにその装置、及び記録媒体 |
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JP2003506195A Expired - Fee Related JP3784387B2 (ja) | 2001-06-15 | 2002-06-14 | データ復号方法 |
JP2008182638A Expired - Fee Related JP4684319B2 (ja) | 2001-06-15 | 2008-07-14 | データ記録方法、データ編集方法およびデータ復号方法、並びにその装置、及び記録媒体 |
JP2009000869A Expired - Lifetime JP4937280B2 (ja) | 2001-06-15 | 2009-01-06 | データ記録方法、データ編集方法およびデータ復号方法、並びにその装置、及び記録媒体 |
JP2009000870A Expired - Lifetime JP4827934B2 (ja) | 2001-06-15 | 2009-01-06 | データ記録方法、データ編集方法およびデータ復号方法、並びにその装置、及び記録媒体 |
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CN (8) | CN101430909B (ja) |
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JP5848594B2 (ja) * | 2011-12-14 | 2016-01-27 | キヤノン株式会社 | 記録装置 |
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