swift 将录制的多个aac音频合并为m4a格式音频
https://www.cnblogs.com/kunH/p/7358235.html
import UIKit import Foundation import AVFoundation
@objc protocol RecordManagerDelegate{
func mergeAction(fileUrl:String) //必须方法
func playDuration(duration:Int,durationString:String)
}
class RecordManager {
var recorder: AVAudioRecorder? var player: AVAudioPlayer? var recordId:String! var audioFilePath:String! weak var delegate: RecordManagerDelegate?
//开始录音 func beginRecord() {
createFolder()
let path = “/homeworkaudio/(recordId!)/” + getStringDate() + “record.wav” let file_path = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first?.appending(path) audioFilePath = file_path
let session = AVAudioSession.sharedInstance() //设置session类型 do { try session.setCategory(AVAudioSessionCategoryPlayAndRecord) } catch let err{ print(“设置类型失败:(err.localizedDescription)”) } //设置session动作 do { try session.setActive(true) } catch let err { print(“初始化动作失败:(err.localizedDescription)”) } //录音设置，注意，后面需要转换成NSNumber，如果不转换，你会发现，无法录制音频文件，我猜测是因为底层还是用OC写的原因 let recordSetting: [String: Any] = [AVSampleRateKey: NSNumber(value: 16000),//采样率 AVFormatIDKey: NSNumber(value: kAudioFormatLinearPCM),//音频格式 AVLinearPCMBitDepthKey: NSNumber(value: 16),//采样位数 AVNumberOfChannelsKey: NSNumber(value: 1),//通道数 AVEncoderAudioQualityKey: NSNumber(value: AVAudioQuality.min.rawValue)//录音质量 ]; //开始录音 do { let url = URL(fileURLWithPath: file_path!) recorder = try AVAudioRecorder(url: url, settings: recordSetting) recorder!.prepareToRecord() recorder!.record() print(“开始录音”) } catch let err { print(“录音失败:(err.localizedDescription)”) } }
// 创建文件 func createFolder(){
let fileManager = FileManager.default
let myDirectory:String = NSHomeDirectory() + “/Documents/homeworkaudio/” + recordId
// withIntermediateDirectories为ture表示路径中间如果有不存在的文件夹都会创建 try!fileManager.createDirectory(atPath: myDirectory, withIntermediateDirectories: true, attributes: nil)
}
// 遍历文件夹 func getAllFilePath(_ dirPath: String) -> [String]? { var filePaths = String
do { let array = try FileManager.default.contentsOfDirectory(atPath: dirPath)
for fileName in array { var isDir: ObjCBool = true
let fullPath = “(dirPath)/(fileName)”
if FileManager.default.fileExists(atPath: fullPath, isDirectory: &isDir) { if !isDir.boolValue { filePaths.append(fullPath) } } }
} catch let error as NSError { print(“get file path error: (error)”) }
return filePaths; }
//结束录音 func stopRecord() { if let recorder = self.recorder { if recorder.isRecording { print(“正在录音，马上结束它，文件保存到了：(audioFilePath!)”) }else { print(“没有录音，但是依然结束它”) } recorder.stop() self.recorder = nil }else { print(“没有初始化”) } }
func pause() { self.player?.pause() }
//播放 func play() {
let myDirectory:String = NSHomeDirectory() + “/Documents/homeworkaudio/” + recordId
let composition = AVMutableComposition()
let audioLocalUrls:Array
for i in 0 ..< audioLocalUrls.count {
let compositionAudioTrack :AVMutableCompositionTrack = composition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: CMPersistentTrackID())!
let asset = AVURLAsset(url: URL.init(fileURLWithPath: audioLocalUrls[i]))
let track = asset.tracks(withMediaType: AVMediaType.audio)[0]
var timeRange:CMTimeRange timeRange = CMTimeRange(start: CMTimeMake(0, 600), duration: track.timeRange.duration)
//偶有崩溃的情况 try! compositionAudioTrack.insertTimeRange(timeRange, of: track, at: composition.duration) } let uuid = CFUUIDCreateString(nil, CFUUIDCreate(nil)) as String
let path = “/homeworkaudio/(recordId!)/” + uuid + “record.wav” let file_path = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first?.appending(path) let mergeAudioURL = NSURL.fileURL(withPath: file_path!)
let assetExport = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetAppleM4A) assetExport?.outputFileType = AVFileType.m4a assetExport?.outputURL = mergeAudioURL
assetExport?.exportAsynchronously(completionHandler: { switch assetExport!.status { case AVAssetExportSessionStatus.failed: print(“failed (String(describing: assetExport?.error))”) case AVAssetExportSessionStatus.cancelled: print(“cancelled (String(describing: assetExport?.error))”) case AVAssetExportSessionStatus.unknown: print(“unknown(String(describing: assetExport?.error))”) case AVAssetExportSessionStatus.waiting: print(“waiting(String(describing: assetExport?.error))”) case AVAssetExportSessionStatus.exporting: print(“exporting(String(describing: assetExport?.error))”) default: print(“success(String(describing: assetExport?.error))(file_path)”)
//…………. do {
let session = AVAudioSession.sharedInstance() //设置session类型 do { try session.setCategory(AVAudioSessionCategoryPlayback) } catch let err{ print(“设置类型失败:(err.localizedDescription)”) } //设置session动作 do { try session.setActive(true) } catch let err { print(“初始化动作失败:(err.localizedDescription)”) }
// let path = Bundle.main.path(forResource: “record”, ofType: “wav”) self.player = try AVAudioPlayer(contentsOf: URL(fileURLWithPath: file_path!)) // player?.volume = 0.8 print(“歌曲长度：(self.player!.duration)”)
let min = Int (self.player!.duration)
// print(“(min / 60):(min % 60)”)
self.delegate?.playDuration(duration: min, durationString: “0’(min / 60)’(min % 60)’”)
self.player?.prepareToPlay() self.player!.play() } catch let err { print(“播放失败:(err.localizedDescription)”) }
//………
for i in 0..<audioLocalUrls.count{ let fileManager = FileManager.default try! fileManager.removeItem(at: URL.init(fileURLWithPath: audioLocalUrls[i])) }
}
})
}
//合并音频 func mergeAudio(){
let myDirectory:String = NSHomeDirectory() + “/Documents/homeworkaudio/” + recordId
let composition = AVMutableComposition()
let audioLocalUrls:Array
if audioLocalUrls == nil || audioLocalUrls.count == 0 { self.delegate?.mergeAction(fileUrl: “文件不存在”) return }
for i in 0 ..< audioLocalUrls.count {
let compositionAudioTrack :AVMutableCompositionTrack = composition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: CMPersistentTrackID())!
let asset = AVURLAsset(url: URL.init(fileURLWithPath: audioLocalUrls[i]))
let track = asset.tracks(withMediaType: AVMediaType.audio)[0]
var timeRange:CMTimeRange timeRange = CMTimeRange(start: CMTimeMake(0, 600), duration: track.timeRange.duration)
try! compositionAudioTrack.insertTimeRange(timeRange, of: track, at: composition.duration) } let uuid = CFUUIDCreateString(nil, CFUUIDCreate(nil)) as String
let path = “/homeworkaudio/” + uuid + “record.wav” let file_path = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first?.appending(path) let mergeAudioURL = NSURL.fileURL(withPath: file_path!)
let assetExport = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetAppleM4A) assetExport?.outputFileType = AVFileType.m4a assetExport?.outputURL = mergeAudioURL
assetExport?.exportAsynchronously(completionHandler: { switch assetExport!.status { case AVAssetExportSessionStatus.failed: print(“failed (String(describing: assetExport?.error))”) case AVAssetExportSessionStatus.cancelled: print(“cancelled (String(describing: assetExport?.error))”) case AVAssetExportSessionStatus.unknown: print(“unknown(String(describing: assetExport?.error))”) case AVAssetExportSessionStatus.waiting: print(“waiting(String(describing: assetExport?.error))”) case AVAssetExportSessionStatus.exporting: print(“exporting(String(describing: assetExport?.error))”) default: print(“success(String(describing: assetExport?.error))”)
self.delegate?.mergeAction(fileUrl: file_path!)
}
})
}
func deleteAudio() { if recordId == nil { return }
let myDirectory:String = NSHomeDirectory() + “/Documents/homeworkaudio/” + recordId
let audioLocalUrls:Array
for i in 0..<audioLocalUrls.count{ let fileManager = FileManager.default try! fileManager.removeItem(at: URL.init(fileURLWithPath: audioLocalUrls[i])) }
}
func getStringDate() -> String { //获取当前时间 let now = Date()
// 创建一个日期格式器 let dformatter = DateFormatter() dformatter.dateFormat = “yyyyMMddHHmmss” print(“当前日期时间：(dformatter.string(from: now))”)
let stringDate = dformatter.string(from: now)
return stringDate }
}
```
