版本记录

版本号	时间
V1.0	2017.09.01

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

后记

未完，待续~~~~