Pset_AudioVisualAppliancePHistory Captures realtime information for audio-video devices, such as for security camera footage and retail information displays. HISTORY: Added in IFC4. IfcAudioVisualAppliance IfcAudioVisualAppliance PowerState Indicates the power state of the device where True is on and False is off. Power State 電源状態 機器の電源オンオフの時間ごとの状態を示す。 MediaSourceHistory Indicates the media source where the identifier corresponds to an entry within the table of available media sources on Pset_AudioVisualApplianceTypeCommon.MediaSource. Media Source MediaContent Indicates the media content storage location, such as URLs to camera footage within particular time periods. Media Content AudioVolumeHistory Indicates the audio volume level where the integer level corresponds to an entry or interpolation within Pset_AudioVisualApplianceTypeCommon.AudioVolume. Audio Volume オーディオビジュアル機器のリアルタイム情報の把握のためのプロパティセット。たとえばセキュリティカメラの画像情報インデックスや音量設定など。IFC4にて追加。