播放产生的音频数据在声音中有噪音和周期性的咔嗒声

我写了一个应用程序，它播放从硬件获得的声音(就像一个充满一定频率的窦波的环形缓冲区)。一切都很好，我可以正确地播放创建的声音，除了周期性的点击(可能在缓冲区的末尾?)和噪音。

我初始化并运行Buffer:

void Audiooutput::InitializeAudioParameters()
{
    Audio_DataWritten = 0;
    Audio_fragments = 4;
    Audio_channels = 2;
    Audio_BufferSize = 256;
    Audio_Samplerate = 8000;
    Audio_ResamplingFactor = 1;
    Audio_Framesize = 2;
    // (SND_PCM_FORMAT_S16_LE / 8);
    Audio_frames = Audio_BufferSize / Audio_Framesize * Audio_fragments;
    snd_pcm_uframes_t size;
    err = snd_pcm_hw_params_any(pcmPlaybackHandle, hw_params);
    err = snd_pcm_hw_params_set_rate_resample(pcmPlaybackHandle, hw_params, 1);
    //     qDebug()<<a1.sprintf(" % d t snd_pcm_hw_params_set_rate: %s",Audio_Samplerate,snd_strerror(err));
    err =
        snd_pcm_hw_params_set_format(pcmPlaybackHandle, hw_params,
                     SND_PCM_FORMAT_S16_LE);
    err =
        snd_pcm_hw_params_set_channels(pcmPlaybackHandle, hw_params,
                       Audio_channels);
    err = snd_pcm_hw_params_set_rate_near(pcmPlaybackHandle, hw_params, &Audio_Samplerate, 0);
    //     qDebug()<<a1.sprintf(" % d t snd_pcm_hw_params_set_rate: %s",Audio_Samplerate,snd_strerror(err));
    if ((err =
         snd_pcm_hw_params_set_periods_near(pcmPlaybackHandle, hw_params,
                        &Audio_fragments, 0)) < 0) {
        qDebug() << a1.sprintf("Error setting # fragments to %d: %sn",
                       Audio_fragments, snd_strerror(err));
    } else
        qDebug() << a1.sprintf("setting # fragments to %d: %sn",
                       Audio_fragments, snd_strerror(err));
    err = snd_pcm_hw_params_get_buffer_size(hw_params, &size);
    if ((err =
         snd_pcm_hw_params_set_buffer_size_near(pcmPlaybackHandle,
                            hw_params,
                            &Audio_frames)) < 0) {
        qDebug() << a1.
            sprintf("Error setting buffer_size %d frames: %s",
                Audio_frames, snd_strerror(err));
    } else
        qDebug() << a1.sprintf("setting Buffersize to %d --> %d: %sn",
                       Audio_BufferSize, Audio_frames,
                       snd_strerror(err));
    Audio_BufferSize = Audio_frames;
    if ((err = snd_pcm_hw_params(pcmPlaybackHandle, hw_params)) < 0) {
        qDebug() << a1.sprintf("Error setting HW params: %s",
                       snd_strerror(err));
    }
    Q_ASSERT(err >= 0);
}
void Audiooutput::ProduceAudioOutput(int n, int mmodes, int totalMModeGates,
         short *sinusValue, short *cosinusValue)
{
    for (int audioSample = 0; audioSample < n;
         audioSample += Audio_ResamplingFactor) {
        currentposition =
            (int)(m_Audio.generalPos % (Audio_BufferSize / 2));
        if (currentposition == 0) {
            QueueAudioBuffer();
            m_Audio.currentPos = 0;
        }
        m_Audio.generalPos++;
        AudioData[currentposition * 2] =
            (short)(sinusValue[audioSample]);
        AudioData[currentposition * 2 + 1] =
            (short)(cosinusValue[audioSample]);
    }
}
void Audiooutput::QueueAudioBuffer()
{
    snd_pcm_prepare(pcmPlaybackHandle);
    Audio_DataWritten +=
        snd_pcm_writei(pcmPlaybackHandle, AudioData, Audio_BufferSize);
}

改变audiobuffer大小或片段也会改变点击周期。有人能帮我解决这个问题吗?我也检查了第一个和最后一个值。他们总是不同的。

操作系统:Ubuntu 11

更多细节。

接收数据的计数是动态的，它的变化取决于不同的参数。但我总是扮演一定的角色，例如128值或256或512....

//我从硬件(在Timerloop中)获得Audiodata

    audiobuffersize  = 256;
    short *AudioData = new short[256];
    int generalAudioSample = 0;
    void CollectDataFromHw()
{  
...  
        int n = 0;
        n = GetData(buf1,buf2);//buf1 = new short[MAX_SHRT]
        if(n > 0)
           FillAudioBuffer(n,buf1,buf2)
...
}
    -------------------------------------------
    void FillAudioBuffer(int n, short*buf1, short*buf2)
    {
      for(int audioSample = 0;audioSample < n; audioSample++){
         iCurrentAudioSample = (int)(generalAudioSample % (audiobuffersize/2)); 
         if(iCurrentAudioSample == 0)  {
            snd_pcm_writei(pcmPlaybackHandle,AudioData,audiobuffersize );
             memset(AudioData,0x00,audiobuffersize*sizeof(short));
         }
        generalAudioSample++;
        AudioData[iCurrentAudioSample * 2]   = (short)(buf1[audioSample];
        AudioData[iCurrentAudioSample * 2 +1]   = (short)(buf2[audioSample];
     }
    }

我也改变了audiobuffersize。如果我把它设置成更大的尺寸，我有一些回声额外的点击。

有什么想法吗?//-----------------------问题是

snd_pcm_prepare(pcmPlaybackHandle);

每次调用这个函数都会产生咔嗒声