要将原始PCM样本转换为Opus数据包，您可以使用AVFoundation框架的AVAudioConverter类来进行转换。以下是一个基本示例：

import AVFoundation

func convertPCMtoOpus(pcmData: Data) -> Data? {
    // 创建输入音频格式
    let pcmFormat = AVAudioFormat(commonFormat: .pcmFormatInt16, sampleRate: 44100, channels: 1, interleaved: false)
    
    // 创建输出音频格式
    let opusFormat = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: 48000, channels: 1, interleaved: false)
    
    // 创建音频转换器
    guard let converter = AVAudioConverter(from: pcmFormat, to: opusFormat) else {
        return nil
    }
    
    // 准备输入音频缓冲区
    let pcmBuffer = AVAudioPCMBuffer(pcmFormat: pcmFormat!, frameCapacity: AVAudioFrameCount(pcmData.count) / pcmFormat!.streamDescription.pointee.mBytesPerFrame)
    pcmBuffer!.frameLength = pcmBuffer!.frameCapacity
    let pcmBufferList = UnsafeMutableAudioBufferListPointer(pcmBuffer!.mutableAudioBufferList)
    pcmData.withUnsafeBytes { (pcmBytes: UnsafePointer) -> Void in
        for frame in 0..