ios – 无法在AudioFileStreamOpen的AudioFileStream_PacketsProc回调中使用AudioConverterFillComplexBuffer将mp3转换为PCM

AudioFileStreamOpen中有一个AudioFileStream_PacketsProc回调,它使用AudioConverterFillComplexBuffer处理将音频包转换为PCM.我遇到的问题是AudioConverterFillComplexBuffer被调用后,我得到了一个-50 Osstatus(paramErr).以下是AudioConverterFillComplexBuffer中使用了哪些参数以及它们的使用方法：

audioConverterRef = AudioConverterRef()

        // AudioConvertInfo is a struct that contains information
        // for the converter regarding the number of packets and 
        // which audiobuffer is being allocated
        convertInfo? = AudioConvertInfo(done: false,numberOfPackets: numberPackets,audioBuffer: buffer,packetDescriptions: packetDescriptions) 

        var framesToDecode: UInt32 = pcmBufferTotalFrameCount! - end

        var localPcmAudioBuffer = AudioBuffer()
        localPcmAudioBuffer.mData = pcmAudioBuffer!.mData.advancedBy(Int(end * pcmBufferFrameSizeInBytes!))

        var localPcmBufferList = audiobufferlist(mNumberBuffers: 1,mBuffers: AudioBuffer(mNumberChannels: 0,mDataByteSize: 0,mData: nil))
        localPcmAudioBuffer = localPcmBufferList.mBuffers
        localPcmAudioBuffer.mData = pcmAudioBuffer!.mData.advancedBy(Int(end * pcmBufferFrameSizeInBytes!))
        localPcmAudioBuffer.mDataByteSize = framesToDecode * pcmBufferFrameSizeInBytes!;
        localPcmAudioBuffer.mNumberChannels = pcmAudioBuffer!.mNumberChannels

        var localPcmBufferList = audiobufferlist(mNumberBuffers: 1,mData: nil))
        localPcmAudioBuffer = localPcmBufferList.mBuffers

        AudioConverterFillComplexBuffer(audioConverterRef,AudioConverter_Callback,&convertInfo,&framesToDecode,&localPcmBufferList,nil)

是否可能导致param错误？

如果需要,这是回调的完整方法：

func handleAudioPackets(inputData: UnsafePointer<Void>,numberBytes: UInt32,numberPackets: UInt32,packetDescriptions: UnsafeMutablePointer<AudioStreamPacketDescription>) {
        if currentlyReadingEntry == nil {
            print("currentlyReadingEntry = nil")
            return
        }
        if currentlyReadingEntry.parsedHeader == false {
            print("currentlyReadingEntry.parsedHeader == false")
            return
        }

        if disposedWasRequested == true {
            print("disposedWasRequested == true")
            return
        }

        guard let audioConverterRef = audioConverterRef else {
            return
        }

        if seektotimeWasRequested == true && currentlyReadingEntry.calculatedBitRate() > 0.0 {
            wakeupPlaybackThread()
            print("seektotimeWasRequested == true && currentlyReadingEntry.calculatedBitRate() > 0.0")
            return
        }

        discontinuous = false

        var buffer = AudioBuffer()
        buffer.mNumberChannels = audioConverteraudioStreamBasicDescription.mChannelsPerFrame
        buffer.mDataByteSize = numberBytes
        buffer.mData = UnsafeMutablePointer<Void>(inputData)


        convertInfo? = AudioConvertInfo(done: false,packetDescriptions: packetDescriptions)


        if packetDescriptions != nil && currentlyReadingEntry.processedPacketsCount < maxCompressedBacketsForBitrateCalculation {
            let count: Int = min(Int(numberPackets),Int(maxCompressedBacketsForBitrateCalculation - currentlyReadingEntry.processedPacketsCount!))
            for var i = 0;i < count;++i{
                let packetSize: Int32 = Int32(packetDescriptions[i].mDataByteSize)
                OSAtomicAdd32(packetSize,&currentlyReadingEntry.processedPacketsSizetotal!)
                OSAtomicIncrement32(&currentlyReadingEntry.processedPacketsCount!)
            }
        }
        while true {
            OsspinLockLock(&pcmBufferSpinLock)
            var used: UInt32 = pcmBufferUsedFrameCount!
            var start: UInt32 = pcmBufferFrameStartIndex!
            var end = (pcmBufferFrameStartIndex! + pcmBufferUsedFrameCount!) % pcmBufferTotalFrameCount!
            var framesLeftInsideBuffer = pcmBufferTotalFrameCount! - used
            OsspinLockUnlock(&pcmBufferSpinLock)

            if framesLeftInsideBuffer == 0 {
                pthread_mutex_lock(&playerMutex)
                while true {
                    OsspinLockLock(&pcmBufferSpinLock)
                    used = pcmBufferUsedFrameCount!
                    start = pcmBufferFrameStartIndex!
                    end = (pcmBufferFrameStartIndex! + pcmBufferUsedFrameCount!) % pcmBufferTotalFrameCount!
                    framesLeftInsideBuffer = pcmBufferTotalFrameCount! - used
                    OsspinLockUnlock(&pcmBufferSpinLock)

                    if framesLeftInsideBuffer > 0 {
                        break
                    }

                    if (disposedWasRequested == true
                        || internalState == ssplayerInternalState.disposed) {
                        pthread_mutex_unlock(&playerMutex)
                        return
                    }

                    if (seektotimeWasRequested == true && currentlyPlayingEntry.calculatedBitRate() > 0.0)
                    {
                        pthread_mutex_unlock(&playerMutex)
                        wakeupPlaybackThread()
                        return;
                    }

                    waiting = true
                    pthread_cond_wait(&playerThreadReadyCondition,&playerMutex)
                    waiting = false
                }
                pthread_mutex_unlock(&playerMutex)
            }
            var localPcmAudioBuffer = AudioBuffer()
            var localPcmBufferList = audiobufferlist(mNumberBuffers: 1,mData: nil))
            localPcmAudioBuffer = localPcmBufferList.mBuffers

            if end >= start {
                var framesAdded: UInt32 = 0
                var framesToDecode: UInt32 = pcmBufferTotalFrameCount! - end
                localPcmAudioBuffer.mData = pcmAudioBuffer!.mData.advancedBy(Int(end * pcmBufferFrameSizeInBytes!))
                localPcmAudioBuffer.mDataByteSize = framesToDecode * pcmBufferFrameSizeInBytes!;
                localPcmAudioBuffer.mNumberChannels = pcmAudioBuffer!.mNumberChannels

                AudioConverterFillComplexBuffer(audioConverterRef,nil)

                framesAdded = framesToDecode

                if status == 100 {
                    OsspinLockLock(&pcmBufferSpinLock)
                    let newCount = pcmBufferUsedFrameCount! + framesAdded
                    pcmBufferUsedFrameCount = newCount
                    OsspinLockUnlock(&pcmBufferSpinLock);

                    OsspinLockLock(&currentlyReadingEntry!.spinLock!)
                    let newFramesAddedCount = currentlyReadingEntry.framesQueued! + Int64(framesAdded)
                    currentlyReadingEntry!.framesQueued! = newFramesAddedCount
                    OsspinLockUnlock(&currentlyReadingEntry!.spinLock!)
                    return
                } else if status != 0 {
                    print("error")
                    return
                }
                framesToDecode = start

                if framesToDecode == 0 {

                    OsspinLockLock(&pcmBufferSpinLock)
                    let newCount = pcmBufferUsedFrameCount! + framesAdded
                    pcmBufferUsedFrameCount = newCount
                    OsspinLockUnlock(&pcmBufferSpinLock);

                    OsspinLockLock(&currentlyReadingEntry!.spinLock!)
                    let newFramesAddedCount = currentlyReadingEntry.framesQueued! + Int64(framesAdded)
                    currentlyReadingEntry!.framesQueued! = newFramesAddedCount
                    OsspinLockUnlock(&currentlyReadingEntry!.spinLock!)
                    continue
                }

                localPcmAudioBuffer.mData = pcmAudioBuffer!.mData
                localPcmAudioBuffer.mDataByteSize = framesToDecode * pcmBufferFrameSizeInBytes!
                localPcmAudioBuffer.mNumberChannels = pcmAudioBuffer!.mNumberChannels

                AudioConverterFillComplexBuffer(audioConverterRef,nil)
                let decodedFramesAdded = framesAdded + framesToDecode
                framesAdded = decodedFramesAdded

                if status == 100 {
                    OsspinLockLock(&pcmBufferSpinLock)
                    let newCount = pcmBufferUsedFrameCount! + framesAdded
                    pcmBufferUsedFrameCount = newCount
                    OsspinLockUnlock(&pcmBufferSpinLock);

                    OsspinLockLock(&currentlyReadingEntry!.spinLock!)
                    let newFramesAddedCount = currentlyReadingEntry.framesQueued! + Int64(framesAdded)
                    currentlyReadingEntry!.framesQueued! = newFramesAddedCount
                    OsspinLockUnlock(&currentlyReadingEntry!.spinLock!)
                    return
                } else if status == 0 {
                    OsspinLockLock(&pcmBufferSpinLock)
                    let newCount = pcmBufferUsedFrameCount! + framesAdded
                    pcmBufferUsedFrameCount = newCount
                    OsspinLockUnlock(&pcmBufferSpinLock);

                    OsspinLockLock(&currentlyReadingEntry!.spinLock!)
                    let newFramesAddedCount = currentlyReadingEntry.framesQueued! + Int64(framesAdded)
                    currentlyReadingEntry!.framesQueued! = newFramesAddedCount
                    OsspinLockUnlock(&currentlyReadingEntry!.spinLock!)
                    continue
                } else if status != 0 {
                    print("error")
                    return
                } else {
                    var framesAdded: UInt32 = 0
                    var framesToDecode: UInt32 = start - end
                    localPcmAudioBuffer.mData = pcmAudioBuffer!.mData.advancedBy(Int(end * pcmBufferFrameSizeInBytes!))
                    localPcmAudioBuffer.mDataByteSize = framesToDecode * pcmBufferFrameSizeInBytes!;
                    localPcmAudioBuffer.mNumberChannels = pcmAudioBuffer!.mNumberChannels

                    var  convertInfoo: UnsafePointer<Void> = unsafeBitCast(convertInfo,UnsafePointer<Void>.self)

                    status = AudioConverterFillComplexBuffer(audioConverterRef,&convertInfoo,nil)

                    framesAdded = framesToDecode

                    if status == 100 {
                        OsspinLockLock(&pcmBufferSpinLock)
                        let newCount = pcmBufferUsedFrameCount! + framesAdded
                        pcmBufferUsedFrameCount = newCount
                        OsspinLockUnlock(&pcmBufferSpinLock);

                        OsspinLockLock(&currentlyReadingEntry!.spinLock!)
                        let newFramesAddedCount = currentlyReadingEntry.framesQueued! + Int64(framesAdded)
                        currentlyReadingEntry!.framesQueued! = newFramesAddedCount
                        OsspinLockUnlock(&currentlyReadingEntry!.spinLock!)
                        return
                    } else if status == 0 {
                        OsspinLockLock(&pcmBufferSpinLock)
                        let newCount = pcmBufferUsedFrameCount! + framesAdded
                        pcmBufferUsedFrameCount = newCount
                        OsspinLockUnlock(&pcmBufferSpinLock);

                        OsspinLockLock(&currentlyReadingEntry!.spinLock!)
                        let newFramesAddedCount = currentlyReadingEntry.framesQueued! + Int64(framesAdded)
                        currentlyReadingEntry!.framesQueued! = newFramesAddedCount
                        OsspinLockUnlock(&currentlyReadingEntry!.spinLock!)
                        continue
                    } else if status != 0 {
                        print("error")
                        return
                    }

                }
            }
        }
    }

audiobufferlist

var localPcmBufferList = audiobufferlist(mNumberBuffers: 2,mBuffers: AudioBuffer(mNumberChannels: 2,mDataByteSize: UInt32(buffer.count),mData: &buffer))