iOS-Core系列框架介绍(二) iOS-Core系列框架介绍(二)

音视频相关框架CoreMedia、CoreAudio、CoreVideo、CoreAudioKit、AVFoundation、AVKit
【iOS-Core系列框架介绍(二)】1.CoreMedia 提供对媒体文件操作的底层接口
2.CoreAudio 提供对音频文件操作的底层接口
3.CoreVideo 提供对视频文件操作的底层接口
以上三个框架，在需要对音频或视频创建及展示进行精确控制的应用程序才会涉及，一般应用程序应该都用不上，而我们常用的是下面几个
4.CoreAudioKit

import CoreAudioKit.AUViewController import CoreAudioKit.CABTMIDICentralViewController import CoreAudioKit.CABTMIDILocalPeripheralViewController import CoreAudioKit.CAInterAppAudioSwitcherView import CoreAudioKit.CAInterAppAudioTransportView

CoreAudioKit提供了一个简单的音频界面，并且是跨应用的
5.AVFoundation

import AVFoundation.AVAnimation // 媒体资源和元数据 import AVFoundation.AVAsset import AVFoundation.AVAssetCache import AVFoundation.AVAssetDownloadStorageManager import AVFoundation.AVAssetDownloadTask import AVFoundation.AVAssetExportSession import AVFoundation.AVAssetImageGenerator import AVFoundation.AVAssetReader import AVFoundation.AVAssetReaderOutput import AVFoundation.AVAssetResourceLoader import AVFoundation.AVAssetTrack import AVFoundation.AVAssetTrackGroup import AVFoundation.AVAssetTrackSegment import AVFoundation.AVAssetWriter import AVFoundation.AVAssetWriterInput import AVFoundation.AVAsynchronousKeyValueLoading // 音频 import AVFoundation.AVAudioFormat import AVFoundation.AVAudioMix import AVFoundation.AVAudioProcessingSettings import AVFoundation.AVBase // 媒体捕捉 import AVFoundation.AVCameraCalibrationData import AVFoundation.AVCaptureAudioDataOutput import AVFoundation.AVCaptureAudioPreviewOutput import AVFoundation.AVCaptureDataOutputSynchronizer import AVFoundation.AVCaptureDepthDataOutput import AVFoundation.AVCaptureDevice import AVFoundation.AVCaptureFileOutput import AVFoundation.AVCaptureInput import AVFoundation.AVCaptureMetadataOutput import AVFoundation.AVCaptureOutput import AVFoundation.AVCaptureOutputBase import AVFoundation.AVCapturePhotoOutput import AVFoundation.AVCaptureSession import AVFoundation.AVCaptureSessionPreset import AVFoundation.AVCaptureStillImageOutput import AVFoundation.AVCaptureSystemPressure import AVFoundation.AVCaptureVideoDataOutput import AVFoundation.AVCaptureVideoPreviewLayer // 视频过渡 import AVFoundation.AVComposition import AVFoundation.AVCompositionTrack import AVFoundation.AVCompositionTrackSegment import AVFoundation.AVContentKeySession import AVFoundation.AVDepthData import AVFoundation.AVError import AVFoundation.AVFAudio import AVFoundation.AVMediaFormat import AVFoundation.AVMediaSelection import AVFoundation.AVMediaSelectionGroup // 元数据 import AVFoundation.AVMetadataFormat import AVFoundation.AVMetadataIdentifiers import AVFoundation.AVMetadataItem import AVFoundation.AVMetadataObject // 缓存 import AVFoundation.AVSampleBufferAudioRenderer import AVFoundation.AVSampleBufferDisplayLayer import AVFoundation.AVSynchronizedLayer import AVFoundation.AVTextStyleRule import AVFoundation.AVTime import AVFoundation.AVTimedMetadataGroup import AVFoundation.AVUtilities import AVFoundation.AVVideoCompositing import AVFoundation.AVVideoComposition import AVFoundation.AVVideoSettings import AVFoundation import AVFoundation.AVOutputSettingsAssistant // 视图 import AVFoundation.AVPlayer import AVFoundation.AVPlayerItem import AVFoundation.AVPlayerItemMediaDataCollector import AVFoundation.AVPlayerItemOutput import AVFoundation.AVPlayerItemTrack import AVFoundation.AVPlayerLayer import AVFoundation.AVPlayerLooper import AVFoundation.AVPlayerMediaSelectionCriteria import AVFoundation.AVQueuedSampleBufferRendering import AVFoundation.AVRouteDetector import AVFoundation.AVSampleBufferRenderSynchronizer import CoreGraphics import CoreMedia import Foundation

AVFoundation是一个强大的多媒体处理框架，它基于CoreMedia、CoreAudio、CoreVideo、CoreAnimation等框架，所以我们对音视频的处理大多数时候都是用它，我们可以用它：

音视频播放和录制
操作媒体资源和元数据(混合音频、视频过渡效果、使用CoreAnimation动画等)

6.AVKit

import AVKit.AVError import AVKit.AVKitDefines import AVKit.AVPictureInPictureController import AVKit.AVPlayerViewController import AVKit.AVRoutePickerView

AVKit基于AVFoundation封装的框架，它提供了视频的播放界面，如果我们的设计是符合原生系统的话，毫不犹豫就应该使用它了