Mercurial > sdl-ios-xcode
diff src/audio/windx5/SDL_dx5audio.c @ 118:7c47e511459d
Fix noise when starting audio under DX5 (thanks Jesse!)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 22 Jul 2001 21:25:22 +0000 |
| parents | 74212992fb08 |
| children | add626b825bb |
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--- a/src/audio/windx5/SDL_dx5audio.c Sun Jul 22 20:57:24 2001 +0000 +++ b/src/audio/windx5/SDL_dx5audio.c Sun Jul 22 21:25:22 2001 +0000 @@ -495,9 +495,11 @@ static int CreateSecondary(LPDIRECTSOUND sndObj, HWND focus, LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize) { + const int numchunks = 2; HRESULT result; DSBUFFERDESC format; - const int numchunks = 2; + LPVOID pvAudioPtr1, pvAudioPtr2; + DWORD dwAudioBytes1, dwAudioBytes2; /* Try to set primary mixing privileges */ if ( focus ) { @@ -540,6 +542,22 @@ } IDirectSoundBuffer_SetFormat(*sndbuf, wavefmt); + /* Silence the initial audio buffer */ + result = IDirectSoundBuffer_Lock(*sndbuf, 0, format.dwBufferBytes, + (LPVOID *)&pvAudioPtr1, &dwAudioBytes1, + (LPVOID *)&pvAudioPtr2, &dwAudioBytes2, + DSBLOCK_ENTIREBUFFER); + if ( result == DS_OK ) { + if ( wavefmt->wBitsPerSample == 8 ) { + memset(pvAudioPtr1, 0x80, dwAudioBytes1); + } else { + memset(pvAudioPtr1, 0x00, dwAudioBytes1); + } + IDirectSoundBuffer_Unlock(*sndbuf, + (LPVOID)pvAudioPtr1, dwAudioBytes1, + (LPVOID)pvAudioPtr2, dwAudioBytes2); + } + /* We're ready to go */ return(numchunks); }