ALSA:无法从欠载运行中恢复，准备失败:管道破裂

我正在编写一个程序，从两个单声道ALSA设备中读取并将它们写入一个立体声ALSA设备。

我使用三个线程和乒乓缓冲区来管理它们。两条阅读线索和一条写作线索。它们的配置如下：

// Capture ALSA device 
alsaBufferSize = 16384;
alsaCaptureChunkSize = 4096;
bitsPerSample = 16;
samplingFrequency = 24000;
numOfChannels = 1;
block = true;
accessType = SND_PCM_ACCESS_RW_INTERLEAVED;
// Playback device (only list params that are different from above)
alsaBufferSize = 16384 * 2;
numOfChannels = 2;
accessType = SND_PCM_ACCESS_RW_NON_INTERLEAVED;

两个读取线程将分别写入ping缓冲区和pong缓冲区。写入线程将等待两个缓冲区中的任何一个准备就绪，锁定它，从中读取，然后解锁它

但当我运行这个程序时，xrun出现了，无法恢复。

ALSA lib pcm.c:7316:(snd_pcm_recover) underrun occurred
ALSA lib pcm.c:7319:(snd_pcm_recover) cannot recovery from underrun, prepare failed: Broken pipe

下面是我写ALSA播放设备的代码：

bool CALSAWriter::writen(uint8_t**  a_pOutputBuffer, uint32_t a_rFrames)
{
    bool ret = false;
    // 1. write audio chunk from ALSA
    const snd_pcm_sframes_t alsaCaptureChunkSize = static_cast<snd_pcm_sframes_t>(a_rFrames); //(m_pALSACfg->alsaCaptureChunkSize);
    const snd_pcm_sframes_t writenFrames = snd_pcm_writen(m_pALSAHandle, (void**)a_pOutputBuffer, alsaCaptureChunkSize); 
    if (0 < writenFrames)
    {// write succeeded
        ret = true;
    }
    else
    {// write failed
        logPrint("CALSAWriter WRITE FAILED for  writen farmes = %d ", writenFrames);
        ret = false;
        const int alsaReadError = static_cast<int>(writenFrames);// alsa error is of int type
        if (ALSA_OK == snd_pcm_recover(m_pALSAHandle, alsaReadError, 0))
        {// recovery succeeded
            a_rFrames = 0;// only recovery was done, no write at all was done
        }
        else
        {    
            logPrint("CALSAWriter: failed to recover from ALSA write error: %s (%i)", snd_strerror(alsaReadError), alsaReadError);
            ret = false;
        }
    }
    // 2. check current buffer load
    snd_pcm_sframes_t framesInBuffer = 0;
    snd_pcm_sframes_t delayedFrames = 0;
    snd_pcm_avail_delay(m_pALSAHandle, &framesInBuffer, &delayedFrames);
    // round to nearest int, cast is safe, buffer size is no bigger than uint32_t
    const int32_t ONE_HUNDRED_PERCENTS = 100;
    const uint32_t bufferLoadInPercents = ONE_HUNDRED_PERCENTS *
            static_cast<int32_t>(framesInBuffer) / static_cast<int32_t>(m_pALSACfg->alsaBufferSize);
    logPrint("write: ALSA buffer percentage: %u, delayed frames: %d",  bufferLoadInPercents, delayedFrames);
    return ret;
}

其他诊断信息：

02:53:00.465047  log info V 1 [write: ALSA buffer percentage: 75, delayed frames: 4096]
02:53:00.635758  log info V 1 [write: ALSA buffer percentage: 74, delayed frames: 4160]
02:53:00.805714  log info V 1 [write: ALSA buffer percentage: 74, delayed frames: 4152]
02:53:00.976781  log info V 1 [write: ALSA buffer percentage: 74, delayed frames: 4144]
02:53:01.147948  log info V 1 [write: ALSA buffer percentage: 0, delayed frames: 0]
02:53:01.317113  log error V 1 [CALSAWriter WRITE FAILED for  writen farmes = -32 ]
02:53:01.317795  log error V 1 [CALSAWriter: failed to recover from ALSA write error: Broken pipe (-32)]