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PODirectSound: simple pcm playing
 

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  1. PODirectSound: simple pcm playing
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    <p>I'm playing with DirectSound and trying to play simple random wav data with following code:</p> <pre><code>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(&amp;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,&amp;dsound,NULL) == DS_OK); assert(dsound-&gt;SetCooperativeLevel(GetDesktopWindow(),DSSCL_PRIORITY) == DS_OK); memset(&amp;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 = &amp;format; res = dsound-&gt;CreateSoundBuffer(&amp;buf_format,&amp;dsbuf,NULL); assert(res == DS_OK ); srand(time(NULL)); assert(IDirectSoundBuffer_Lock(dsbuf,0,buf_format.dwBufferBytes,(LPVOID *)&amp;data1,(LPDWORD)&amp;size1, (LPVOID *)&amp;data2,(LPDWORD)&amp;size2,DSBLOCK_ENTIREBUFFER) == DS_OK); cout &lt;&lt; "got buffer with size "&lt;&lt;size1&lt;&lt;endl; for (uint32_t i = 0 ; i &lt; 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; } </code></pre> <p>but on output i hear only silence. Also there are no error on outputs and my data1 is really some random stuff. What am i doing wrong?</p>
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    1. PTQuestion
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    1. USuser1266334
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      1. PODirectSound: simple pcm playing
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      1. VTUpMod
    1. COYour sound card (or its driver) could be dissing the garbage, you should try generating a sine wave in data1
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      1. PODirectSound: simple pcm playing
      1. USDjole
    2. COWhere is your `IDirectSound8::SetCooperativeLevel` call, do you have any?
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      1. USRoman R.
    3. COi've successfully played random data with WinMM and XAudio2. So i don't think sin-wave will show the problem. Also i'm calling SetCooperativeLevel as you may see in my code.
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      1. PODirectSound: simple pcm playing
      1. USuser1266334
 

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