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Fix noise when starting audio under DX5 (thanks Jesse!)

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--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40119
This commit is contained in:
Sam Lantinga 2001-07-22 21:25:22 +00:00
parent 77331bf064
commit c41d612838
1 changed files with 19 additions and 1 deletions
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20
src/audio/windx5/SDL_dx5audio.c
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@ -495,9 +495,11 @@ static int CreatePrimary(LPDIRECTSOUND sndObj, HWND focus,
static int CreateSecondary(LPDIRECTSOUND sndObj, HWND focus, static int CreateSecondary(LPDIRECTSOUND sndObj, HWND focus,
LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize) LPDIRECTSOUNDBUFFER *sndbuf, WAVEFORMATEX *wavefmt, Uint32 chunksize)
{ {
const int numchunks = 2;
HRESULT result; HRESULT result;
DSBUFFERDESC format; DSBUFFERDESC format;
const int numchunks = 2; LPVOID pvAudioPtr1, pvAudioPtr2;
DWORD dwAudioBytes1, dwAudioBytes2;
/* Try to set primary mixing privileges */ /* Try to set primary mixing privileges */
if ( focus ) { if ( focus ) {
@ -540,6 +542,22 @@ static int CreateSecondary(LPDIRECTSOUND sndObj, HWND focus,
} }
IDirectSoundBuffer_SetFormat(*sndbuf, wavefmt); 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 */ /* We're ready to go */
return(numchunks); return(numchunks);
} }