如何将包含AAC数据的AudioBufferList转换为CMSampleBuffer

// 假设已经有一个包含AAC数据的AudioBufferList对象，命名为audioBufferList

// 创建AudioStreamBasicDescription结构体
var audioFormat = AudioStreamBasicDescription()
audioFormat.mSampleRate = 44100.0
audioFormat.mFormatID = kAudioFormatMPEG4AAC
audioFormat.mFormatFlags = AudioFormatFlags(MPEG4ObjectID.AAC_LC.rawValue)
audioFormat.mBytesPerPacket = 0
audioFormat.mFramesPerPacket = 1024
audioFormat.mBytesPerFrame = 0
audioFormat.mChannelsPerFrame = 2
audioFormat.mBitsPerChannel = 0
audioFormat.mReserved = 0

// 创建AudioBuffer对象并添加到AudioBufferList中
var audioBuffer = AudioBuffer()
audioBuffer.mNumberChannels = audioFormat.mChannelsPerFrame
audioBuffer.mDataByteSize = UInt32(audioBufferList.mBuffers.mDataByteSize)
audioBuffer.mData = audioBufferList.mBuffers.mData

// 创建CMBlockBuffer对象
var blockBuffer: CMBlockBuffer?
CMBlockBufferCreateWithMemoryBlock(
    allocator: kCFAllocatorDefault,
    memoryBlock: &audioBuffer,
    blockLength: Int(audioBuffer.mDataByteSize),
    blockAllocator: kCFAllocatorNull,
    customBlockSource: nil,
    offsetToData: 0,
    dataLength: Int(audioBuffer.mDataByteSize),
    flags: 0,
    blockBufferOut: &blockBuffer
)

// 创建CMSampleBuffer对象
var sampleBuffer: CMSampleBuffer?
CMSampleBufferCreate(
    allocator: kCFAllocatorDefault,
    dataBuffer: blockBuffer,
    dataReady: true,
    makeDataReadyCallback: nil,
    refcon: nil,
    formatDescription: audioFormat,
    sampleCount: CMItemCount(audioBufferList.mNumberBuffers),
    sampleTimingEntryCount: 0,
    sampleTimingArray: nil,
    sampleSizeEntryCount: 0,
    sampleSizeArray: nil,
    sampleBufferOut: &sampleBuffer
)

// 现在可以使用CMSampleBuffer对象进行后续处理或传输