XAudio2-只播放部分音频

我正在尝试使用xaudio2播放mp3/wma。我设法使用Media Foundation Source Reader对象来进行解码。我的问题是，它没有播放完整的音频；我只能播放一部分音频。

我想做的是，从IMFSourceReader获得下一个样本，并将其作为sourcevoice的下一个缓冲区提交。重复此操作直到从IMFSourceReader读取所有数据。

 while (true)
{
    DWORD dwFlags = 0;
    // Read the next sample.
    hr = pReader->ReadSample(
        (DWORD)MF_SOURCE_READER_FIRST_AUDIO_STREAM,
        0, NULL, &dwFlags, NULL, &pSample );

    if (dwFlags & MF_SOURCE_READERF_CURRENTMEDIATYPECHANGED)
    {
        printf("Type change - not supported by WAVE file format.n");
        break;
    }
    if (dwFlags & MF_SOURCE_READERF_ENDOFSTREAM)
    {
        printf("End of input file.n");
        break;
    }
    if (pSample == NULL)
    {
        printf("No samplen");
        continue;
    }
    // Get a pointer to the audio data in the sample.
    hr = pSample->ConvertToContiguousBuffer(&pBuffer);
    if (FAILED(hr)) { break; }

    hr = pBuffer->Lock(&pAudioData, NULL, &cbBuffer);
    if (FAILED(hr)) { break; }

    // Make sure not to exceed the specified maximum size.
    if (cbMaxAudioData - cbAudioData < cbBuffer)
    {
        cbBuffer = cbMaxAudioData - cbAudioData;
    }
    // Write this data to the output file.
    hr = WriteToFile(hFile, pAudioData, cbBuffer);
    int audioBufferLength = cbBuffer;

    if (FAILED(hr)) { break; }
    SubmitBuffer(pAudioData, audioBufferLength);
    // Unlock the buffer.
    hr = pBuffer->Unlock();

    pAudioData = NULL;
    if (FAILED(hr)) { break; }
    // Update running total of audio data.
    cbAudioData += cbBuffer;
    if (cbAudioData >= cbMaxAudioData)
    {
        break;
    }
    SafeRelease(&pSample);
    SafeRelease(&pBuffer);
}
void AudioDecoder::SubmitBuffer(byte *pAudioData, int audioBufferLength)
{
    byte * pAudioBuffer = new byte[audioBufferLength];
    CopyMemory(pAudioBuffer, pAudioData, audioBufferLength);
    if (pAudioBuffer != nullptr)
    {
     // Create an XAUDIO2_BUFFER for submitting audio data
     XAUDIO2_BUFFER buffer = {0};
     buffer.AudioBytes = audioBufferLength;
     buffer.pAudioData = pAudioBuffer;
     buffer.pContext = pAudioBuffer;
     HRESULT hresult = m_pSourceVoice->SubmitSourceBuffer(&buffer);
    }
}

在此之后，我将调用m_pSourceVoice->Start（）。这将启动音频，但不会播放完整的音频。我还需要添加其他内容吗？