我正在使用设备麦克风录制音频,AVAudioRecorder
该麦克风会以.caf格式返回文件,该文件只能在Apple设备上播放,而不能在Android设备上播放。由于Apple不支持.mp3文件,因此我想在将其上传到服务器之前将其转换为.mp4格式。为.MP4是良好的只有音频?我可以用转换AVAssetExportSession
吗?
以下是录音机代码:
func setupAudioRecorder ()
{
let fileMgr = FileManager.default
let dirPaths = fileMgr.urls(for:.documentDirectory,
in:.userDomainMask)
let soundFileURL = dirPaths[0].appendingPathComponent("myaudio.caf")
let recordSettings =
[AVEncoderAudioQualityKey: AVAudioQuality.min.rawValue,
AVEncoderBitRateKey: 16,
AVNumberOfChannelsKey: 2,
AVSampleRateKey: 44100.0] as [String : Any]
do {
try audioSession.setCategory(
AVAudioSessionCategoryPlayAndRecord)
} catch let error as NSError {
print("audioSession error: \(error.localizedDescription)")
}
do {
try audioRecorder = AVAudioRecorder(url: soundFileURL,
settings: recordSettings as [String : AnyObject])
audioRecorder?.prepareToRecord()
} catch let error as NSError {
print("audioSession error: \(error.localizedDescription)")
}
}
经过大量搜索,我能够使用这段代码将.caf转换为.mp4
let audioURL = ".caf audio file url"
let fileMgr = FileManager.default
let dirPaths = fileMgr.urls(for: .documentDirectory,
in: .userDomainMask)
let outputUrl = dirPaths[0].appendingPathComponent("audiosound.mp4")
let asset = AVAsset.init(url: audioURL)
let exportSession = AVAssetExportSession.init(asset: asset, presetName: AVAssetExportPresetHighestQuality)
// remove file if already exits
let fileManager = FileManager.default
do{
try? fileManager.removeItem(at: outputUrl)
}catch{
print("can't")
}
exportSession?.outputFileType = AVFileTypeMPEG4
exportSession?.outputURL = outputUrl
exportSession?.metadata = asset.metadata
exportSession?.exportAsynchronously(completionHandler: {
if (exportSession?.status == .completed)
{
print("AV export succeeded.")
// outputUrl to post Audio on server
}
else if (exportSession?.status == .cancelled)
{
print("AV export cancelled.")
}
else
{
print ("Error is \(String(describing: exportSession?.error))")
}
})
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