DirectSound的：简单的PCM播放

我玩的DirectSound，并试图用下面的代码玩简单随机WAV数据：DirectSound的：简单的PCM播放

int _tmain(int argc, _TCHAR* argv[]) 
{ 
    LPDIRECTSOUND8 dsound; 
    WAVEFORMATEX format; 
    const int numchunks = 8; 
    LPDIRECTSOUNDBUFFER dsbuf; 
    DSBUFFERDESC buf_format; 
    const int chunksize = 1024; 
    HRESULT res; 
    uint8_t *data1,*data2; 
    uint32_t size1,size2; 

    memset(&format,0,sizeof(WAVEFORMATEX)); 

    format.wFormatTag = WAVE_FORMAT_PCM; 
    format.nChannels = 1; 
    format.wBitsPerSample = 16; 
    format.nSamplesPerSec = 44100; 
    format.nBlockAlign = format.nChannels * format.wBitsPerSample/8; 
    format.nAvgBytesPerSec = format.nBlockAlign * format.nSamplesPerSec ; 
    format.cbSize = 0; 

    assert(DirectSoundCreate8(NULL,&dsound,NULL) == DS_OK); 


    assert(dsound->SetCooperativeLevel(GetDesktopWindow(),DSSCL_PRIORITY) == DS_OK); 


    memset(&buf_format,0,sizeof(DSBUFFERDESC)); 
    buf_format.dwSize = sizeof(buf_format); 
    buf_format.dwFlags = DSBCAPS_GETCURRENTPOSITION2; 
    buf_format.dwFlags |= DSBCAPS_STICKYFOCUS; 
    buf_format.dwBufferBytes = numchunks * chunksize; 
    buf_format.dwReserved = 0; 
    buf_format.lpwfxFormat = &format; 


    res = dsound->CreateSoundBuffer(&buf_format,&dsbuf,NULL); 
    assert(res == DS_OK); 

    srand(time(NULL)); 

    assert(IDirectSoundBuffer_Lock(dsbuf,0,buf_format.dwBufferBytes,(LPVOID *)&data1,(LPDWORD)&size1, 
          (LPVOID *)&data2,(LPDWORD)&size2,DSBLOCK_ENTIREBUFFER) == DS_OK); 

    cout << "got buffer with size "<<size1<<endl; 

    for (uint32_t i = 0 ; i < size1; i ++) 
     data1[i] = rand() % 256; 

    IDirectSoundBuffer_Unlock(dsbuf, 
            (LPVOID) data1, (DWORD)size1, 
            (LPVOID) data2, (DWORD)size2); 

    assert(IDirectSoundBuffer_Play(dsbuf,0,0,DSBPLAY_LOOPING) == DS_OK); 


    cin.get(); 

    return 0; 
}

但输出我听到的只有沉默。也没有输出错误，我的data1实际上是一些随机的东西。我究竟做错了什么？

来源

2012-04-23 user1266334

你的声卡（或驱动程序）可能被瞧不起的垃圾，你应该尝试在Data1产生正弦波 – Djole 2012-04-23 14:38:43

在哪里你的'IDirectSound8 :: SetCooperativeLevel'调用，你有吗？ – 2012-04-23 21:32:23

我已经用WinMM和XAudio2成功播放了随机数据。所以我不认为正弦波会显示问题。另外我打电话给SetCooperativeLevel，就像你在我的代码中看到的一样。 – user1266334 2012-04-27 14:08:28

来源

2014-05-01 14:02:49

我有完全相同的问题，我发现只需'DSBCAPS_GLOBALFOCUS'就足以从我的代码中获得'声音' – Graeme 2017-07-01 22:01:17

DirectSound的：简单的PCM播放

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