Ios AVAUDIO转换器压缩/PCM转换状态-50（kAudio_参数错误）

我正在尝试使用AVAudioConverter将压缩音频数据（在本例中为mp3、96kbps、CBR、立体声）转换为PCM数据（标准输出格式，通过调用audioEngine.outputNode.outputFormatForBus（0）获得）。我使用音频文件流来获取数据包。我以前使用过AudioQueue来播放这些数据包，所以它们是有效的

这就是我称之为convertToBuffer的地方：

let outputBuffer = AVAudioPCMBuffer(PCMFormat: outputFormat, frameCapacity: outputBufferFrameLength)  
outputBuffer.frameLength = outputBufferFrameLength  
var error:NSError?  
audioConverter.convertToBuffer(outputBuffer, error: &error, withInputFromBlock: { (packetCount:AVAudioPacketCount, inputStatus:UnsafeMutablePointer<AVAudioConverterInputStatus>) -> AVAudioBuffer? in  
    return self.getAudioConverterInput(packetCount, inputStatus: inputStatus)  
})  
if let error = error{  
    print("conv error:", error)  
}else{  
    // TODO: Do stuff with buffer  
}  

let outputBuffer=AVAudioPCMBuffer（PCMFormat:outputFormat，frameCapacity:outputBufferFrameLength）
outputBuffer.frameLength=outputBufferFrameLength
var错误：N错误？
audioConverter.convertToBuffer（outputBuffer，错误：&error，withInputFromBlock:{（packetCount:AVAudioPacketCount，inputStatus:UnsafeMutablePointer）->AVAudioBuffer？在
返回self.getAudioConverterInput（packetCount，inputStatus:inputStatus）
})  
如果let error=error{
打印（“conv错误：”，错误）
}否则{
//TODO:使用缓冲区做一些事情
}  

这是处理输入的函数

func getAudioConverterInput(packetCount:AVAudioPacketCount, inputStatus:UnsafeMutablePointer<AVAudioConverterInputStatus>) -> AVAudioBuffer?{  
        if let currentAudioFormat = currentAudioFormat, firstPackets = packets.first{  
            inputStatus.memory = .HaveData  
            let buffer = AVAudioCompressedBuffer(format: currentAudioFormat, packetCapacity: packetCount, maximumPacketSize: Int(currentMaximumPacketSize))  
            var currentPackets:Packets = firstPackets  
            var currentStartOffset:Int64 = 0  
            for i in 0..<packetCount{  
                let currentDescription = currentPackets.packetDescriptions[currentPacket]  
                memcpy(buffer.data.advancedBy(Int(currentStartOffset)), currentPackets.data.advancedBy(Int(currentDescription.mStartOffset)), Int(currentDescription.mDataByteSize))  
                buffer.packetDescriptions[Int(i)] = AudioStreamPacketDescription(mStartOffset: currentStartOffset, mVariableFramesInPacket: currentDescription.mVariableFramesInPacket, mDataByteSize: currentDescription.mDataByteSize)  

                currentStartOffset += Int64(currentDescription.mDataByteSize)  
                currentPacket+=1  

                if (currentPackets.numberOfPackets == UInt32(currentPacket)){  
                    currentPacket = 0  
                    packets.removeFirst()  
                    if let firstPackets = packets.first{  
                        currentPackets = firstPackets  
                    }else{  
                        buffer.packetCount = i + 1  
                        return buffer  
                    }  
                }  
            }  
            buffer.packetCount = packetCount  
            return buffer  
        }  
        inputStatus.memory = .NoDataNow  
        return nil  
    }  

func getAudioConverterInput（包计数：AvaudioPackageCount，输入状态：UnsafeMutablePointer）->AVAudioBuffer？{
如果让currentAudioFormat=currentAudioFormat，则firstPackets=packets.first{
inputStatus.memory=.HaveData
let buffer=AVAudioCompressedBuffer（格式：currentAudioFormat，packetCapacity:packetCount，maximumPacketSize:Int（currentMaximumPacketSize））
var currentpackes:Packets=firstPackets
var currentStartOffset:Int64=0
对于0中的i..您是否解决了问题。如果是这样，您是否可以发布修复程序。我正在尝试使用objective-c，我也收到了相同的错误-50。不，很遗憾，我没有，对不起。也许您可以，但是您的inputStatus.memory=.HaveData在调用getAudioConverterInput之前在输入块中？您是否解决了问题。如果是这样，您是否可以发布修复程序。我是在objective-c中尝试时，我也得到了相同的错误-50。不，很遗憾我没有，对不起。也许你可以，但是你的inputStatus.memory=.HaveData在调用getAudioConverterInput之前在输入块中？