使用AudioConverter Swift将.m4a文件转换为.aiff
我正在尝试使用中的答案将.m4a格式的给定音频文件转换为.aiff格式。我已将代码转换为Swift 3.0使用AudioConverter Swift将.m4a文件转换为.aiff,swift,audio,avfoundation,Swift,Audio,Avfoundation,我正在尝试使用中的答案将.m4a格式的给定音频文件转换为.aiff格式。我已将代码转换为Swift 3.0 func convertAudio(_ url: URL, outputURL: URL) { var error : OSStatus = noErr var destinationFile : ExtAudioFileRef? = nil var sourceFile : ExtAudioFileRef? = nil var srcFormat : A
func convertAudio(_ url: URL, outputURL: URL) {
var error : OSStatus = noErr
var destinationFile : ExtAudioFileRef? = nil
var sourceFile : ExtAudioFileRef? = nil
var srcFormat : AudioStreamBasicDescription = AudioStreamBasicDescription()
var dstFormat : AudioStreamBasicDescription = AudioStreamBasicDescription()
var audioConverter : AudioConverterRef? = nil
ExtAudioFileOpenURL(url as CFURL, &sourceFile)
var thePropertySize: UInt32 = UInt32(MemoryLayout.stride(ofValue: srcFormat))
ExtAudioFileGetProperty(sourceFile!, kExtAudioFileProperty_FileDataFormat, &thePropertySize, &srcFormat)
dstFormat.mSampleRate = 44100 //Set sample rate
dstFormat.mFormatID = kAudioFormatLinearPCM
dstFormat.mChannelsPerFrame = 1
dstFormat.mBitsPerChannel = 16
dstFormat.mBytesPerPacket = 2 * dstFormat.mChannelsPerFrame
dstFormat.mBytesPerFrame = 2 * dstFormat.mChannelsPerFrame
dstFormat.mFramesPerPacket = 1
dstFormat.mFormatFlags = kAudioFormatFlagIsBigEndian | kAudioFormatFlagIsSignedInteger
//Create destination file
ExtAudioFileCreateWithURL(outputURL as CFURL, kAudioFileAIFFType, &dstFormat, nil,
AudioFileFlags.eraseFile.rawValue, &destinationFile)
ExtAudioFileSetProperty(sourceFile!, kExtAudioFileProperty_ClientDataFormat, thePropertySize, &dstFormat)
ExtAudioFileSetProperty(destinationFile!, kExtAudioFileProperty_ClientDataFormat, thePropertySize, &dstFormat)
var size : UInt32 = UInt32(MemoryLayout.stride(ofValue: audioConverter))
ExtAudioFileGetProperty(destinationFile!, kExtAudioFileProperty_AudioConverter, &size, &audioConverter)
var canResume : UInt32 = 0
size = UInt32(MemoryLayout.stride(ofValue: canResume))
error = AudioConverterGetProperty(audioConverter!, kAudioConverterPropertyCanResumeFromInterruption, &size, &canResume)
let bufferByteSize : UInt32 = 32768
var srcBuffer = [UInt8](repeating: 0, count: 32768)
var sourceFrameOffset : ULONG = 0
print("Converting audio file")
while(true){
var fillBufList = AudioBufferList(
mNumberBuffers: 1,
mBuffers: AudioBuffer(
mNumberChannels: 2,
mDataByteSize: UInt32(srcBuffer.count),
mData: &srcBuffer
)
)
var numFrames : UInt32 = 0
if(dstFormat.mBytesPerFrame > 0){
numFrames = bufferByteSize / dstFormat.mBytesPerFrame
}
ExtAudioFileRead(sourceFile!, &numFrames, &fillBufList)
if(numFrames == 0){
error = noErr;
break;
}
sourceFrameOffset += numFrames
error = ExtAudioFileWrite(destinationFile!, numFrames, &fillBufList)
}
ExtAudioFileDispose(destinationFile!)
ExtAudioFileDispose(sourceFile!)
}
问题是音频转换器在这条线上似乎为零
error = AudioConverterGetProperty(audioConverter!, kAudioConverterPropertyCanResumeFromInterruption, &size, &canResume)
我似乎不明白为什么。我遗漏了什么?跳过AudioConverterGetProperty
你实际上没有使用它。
以下代码段将音频文件转换为AIFF:它以支持的格式之一读取源文件,创建AIFF编码器,并使用bufferByteSize缓冲区在其中循环。错误处理得很温和
完整代码,swift 3:
支撑方法:
func reportError(error: OSStatus) {
// Handle error
}
调用:
let sourceUrl = URL(string: Bundle.main.path(forResource: "sample", ofType: "mp3")!)
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory,
.userDomainMask,
true)
let documentsDirectory = URL(string: paths.first!)
let destUrl = documentsDirectory?.appendingPathComponent("converted.aiff")
if let sourceUrl = sourceUrl, let destUrl = destUrl {
print("from \(sourceUrl.absoluteString) to \(destUrl.absoluteString)")
convertAudio(sourceUrl, outputURL: destUrl)
}
您似乎没有初始化audioConverter,因此它有它的默认值-nil@Cristik它不是在ExtAudioFileGetPropertydestinationFile中设置的吗!,kExtAudioFileProperty_音频转换器、大小和音频转换器?如果没有,那么初始化它的正确方法是什么?除了使用kAudioFileWAVEType外,是否还有其他更改要导出到wav?我在错误=ExtAudioFileSetPropertydestinationFile!时遇到零崩溃!,当使用波形时。我需要将m4a导出到wav或flac。@MarcosGriselli在MP3转换时遇到同样的错误。你找到解决办法了吗?@MarcosGriselli我也遇到了CAF格式的类似问题。到目前为止有什么解决办法吗?
let sourceUrl = URL(string: Bundle.main.path(forResource: "sample", ofType: "mp3")!)
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory,
.userDomainMask,
true)
let documentsDirectory = URL(string: paths.first!)
let destUrl = documentsDirectory?.appendingPathComponent("converted.aiff")
if let sourceUrl = sourceUrl, let destUrl = destUrl {
print("from \(sourceUrl.absoluteString) to \(destUrl.absoluteString)")
convertAudio(sourceUrl, outputURL: destUrl)
}