AVFoundation框架解析（十二）—— AVFoundation的变化（四）

版本记录 版本号时间V1.02017.09.01 前言

AVFoundation框架是ios中很重要的框架，所有与视频音频相关的软硬件控制都在这个框架里面，接下来这几篇就主要对这个框架进行介绍和讲解。感兴趣的可以看我上几篇。1. AVFoundation框架解析（一）—— 基本概览2. AVFoundation框架解析（二）—— 实现视频预览录制保存到相册3. AVFoundation框架解析（三）—— 几个关键问题之关于框架的深度概括4. AVFoundation框架解析（四）—— 几个关键问题之AVFoundation探索（一）5. AVFoundation框架解析（五）—— 几个关键问题之AVFoundation探索（二）6. AVFoundation框架解析（六）—— 视频音频的合成（一）7. AVFoundation框架解析（七）—— 视频组合和音频混合调试8. AVFoundation框架解析（八）—— 优化用户的播放体验9. AVFoundation框架解析（九）—— AVFoundation的变化（一）10. AVFoundation框架解析（十）—— AVFoundation的变化（二）11. AVFoundation框架解析（十一）—— AVFoundation的变化（三）

AVFoundation的变化

我写这篇文章的时候是2017-09-01，文档中列出了AVFoundation框架的更新和改变，下面我就给大家列出来一下。

AVPlayerItemTrack.h

Added AVPlayerItemTrack Added AVPlayerItemTrack.assetTrack Added AVPlayerItemTrack.enabled

AVPlayerLayer.h

Added AVPlayerLayer Added AVPlayerLayer.player Added +[AVPlayerLayer playerLayerWithPlayer:] Added AVPlayerLayer.readyForDisplay Added AVPlayerLayer.videoGravity

AVSynchronizedLayer.h

Added AVSynchronizedLayer Added AVSynchronizedLayer.playerItem Added +[AVSynchronizedLayer synchronizedLayerWithPlayerItem:]

AVTime.h

Added -[NSCoder decodeCMTimeForKey:] Added -[NSCoder decodeCMTimeMappingForKey:] Added -[NSCoder decodeCMTimeRangeForKey:] Added -[NSCoder encodeCMTime:forKey:] Added -[NSCoder encodeCMTimeMapping:forKey:] Added -[NSCoder encodeCMTimeRange:forKey:] Added -[NSValue CMTimeMappingValue] Added -[NSValue CMTimeRangeValue] Added -[NSValue CMTimeValue] Added +[NSValue valueWithCMTime:] Added +[NSValue valueWithCMTimeMapping:] Added +[NSValue valueWithCMTimeRange:] Added NSCoder(AVTimeCoding) Added NSValue(NSValueAVFoundationExtensions)

AVTimedMetadataGroup.h

Added AVMutableTimedMetadataGroup Added AVMutableTimedMetadataGroup.items Added AVMutableTimedMetadataGroup.timeRange Added AVTimedMetadataGroup Added -[AVTimedMetadataGroup initWithItems:timeRange:] Added AVTimedMetadataGroup.items Added AVTimedMetadataGroup.timeRange

AVUtilities.h

Added AVMakeRectWithAspectRatioInsideRect()

AVVideoComposition.h

Added -[AVAsset unusedTrackID] Added AVMutableVideoComposition Added AVMutableVideoComposition.animationTool Added AVMutableVideoComposition.frameDuration Added AVMutableVideoComposition.instructions Added AVMutableVideoComposition.renderScale (no architecture available) Added AVMutableVideoComposition.renderSize Added +[AVMutableVideoComposition videoComposition] Added AVMutableVideoCompositionInstruction Added AVMutableVideoCompositionInstruction.backgroundColor Added AVMutableVideoCompositionInstruction.enablePostProcessing Added AVMutableVideoCompositionInstruction.layerInstructions Added AVMutableVideoCompositionInstruction.timeRange Added +[AVMutableVideoCompositionInstruction videoCompositionInstruction] Added AVMutableVideoCompositionLayerInstruction Added -[AVMutableVideoCompositionLayerInstruction setOpacity:atTime:] Added -[AVMutableVideoCompositionLayerInstruction setOpacityRampFromStartOpacity:toEndOpacity:timeRange:] Added -[AVMutableVideoCompositionLayerInstruction setTransform:atTime:] Added -[AVMutableVideoCompositionLayerInstruction setTransformRampFromStartTransform:toEndTransform:timeRange:] Added AVMutableVideoCompositionLayerInstruction.trackID Added +[AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstruction] Added +[AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:] Added AVVideoComposition Added AVVideoComposition.animationTool Added AVVideoComposition.frameDuration Added AVVideoComposition.instructions Added AVVideoComposition.renderScale (no architecture available) Added AVVideoComposition.renderSize Added AVVideoCompositionCoreAnimationTool Added +[AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithAdditionalLayer:asTrackID:] Added +[AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:inLayer:] Added AVVideoCompositionInstruction Added AVVideoCompositionInstruction.backgroundColor Added AVVideoCompositionInstruction.enablePostProcessing Added AVVideoCompositionInstruction.layerInstructions Added AVVideoCompositionInstruction.timeRange Added AVVideoCompositionLayerInstruction Added -[AVVideoCompositionLayerInstruction getOpacityRampForTime:startOpacity:endOpacity:timeRange:] Added -[AVVideoCompositionLayerInstruction getTransformRampForTime:startTransform:endTransform:timeRange:] Added AVVideoCompositionLayerInstruction.trackID Added AVAsset(AVAssetVideoCompositionUtility)

AVVideoSettings.h

Added AVVideoAverageBitRateKey Added AVVideoCleanApertureHeightKey Added AVVideoCleanApertureHorizontalOffsetKey Added AVVideoCleanApertureKey Added AVVideoCleanApertureVerticalOffsetKey Added AVVideoCleanApertureWidthKey Added AVVideoCodecAppleProRes422 Added AVVideoCodecAppleProRes4444 Added AVVideoCodecH264 Added AVVideoCodecJPEG Added AVVideoCodecKey Added AVVideoColorPrimariesKey Added AVVideoColorPrimaries_EBU_3213 Added AVVideoColorPrimaries_ITU_R_709_2 Added AVVideoColorPrimaries_SMPTE_C Added AVVideoColorPropertiesKey Added AVVideoCompressionPropertiesKey Added AVVideoHeightKey Added AVVideoMaxKeyFrameIntervalKey Added AVVideoPixelAspectRatioHorizontalSpacingKey Added AVVideoPixelAspectRatioKey Added AVVideoPixelAspectRatioVerticalSpacingKey Added AVVideoQualityKey Added AVVideoScalingModeFit Added AVVideoScalingModeKey Added AVVideoScalingModeResize Added AVVideoScalingModeResizeAspect Added AVVideoScalingModeResizeAspectFill Added AVVideoTransferFunctionKey Added AVVideoTransferFunction_ITU_R_709_2 Added AVVideoTransferFunction_SMPTE_240M_1995 Added AVVideoWidthKey Added AVVideoYCbCrMatrixKey Added AVVideoYCbCrMatrix_ITU_R_601_4 Added AVVideoYCbCrMatrix_ITU_R_709_2 Added AVVideoYCbCrMatrix_SMPTE_240M_1995