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Fix for soundcards that can't do 8-bit audio, only 16-bit (also 

checked for soundcards that can't do stereo while I was at it).
This commit is contained in:
Ove Kaaven 2002-09-29 18:01:33 +00:00 committed by Alexandre Julliard
parent 92810b90c1
commit 4774477b2b
1 changed files with 16 additions and 4 deletions
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20
dlls/dsound/dsound_main.c
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@ -641,11 +641,23 @@ HRESULT WINAPI DirectSoundCreate8(REFGUID lpGUID,LPDIRECTSOUND8 *ppDS,IUnknown *
/* Set default wave format (may need it for waveOutOpen) */
(*ippDS)->wfx.wFormatTag = WAVE_FORMAT_PCM;
(*ippDS)->wfx.nChannels = 2;
/* default to stereo, if the sound card can do it */
if (wcaps.wChannels > 1)
(*ippDS)->wfx.nChannels = 2;
else
(*ippDS)->wfx.nChannels = 1;
/* default to 8, if the sound card can do it */
if (wcaps.dwFormats & (WAVE_FORMAT_4M08 | WAVE_FORMAT_2M08 | WAVE_FORMAT_1M08 |
WAVE_FORMAT_4S08 | WAVE_FORMAT_2S08 | WAVE_FORMAT_1S08)) {
(*ippDS)->wfx.wBitsPerSample = 8;
(*ippDS)->wfx.nBlockAlign = 1 * (*ippDS)->wfx.nChannels;
} else {
/* it's probably a 16-bit-only card */
(*ippDS)->wfx.wBitsPerSample = 16;
(*ippDS)->wfx.nBlockAlign = 2 * (*ippDS)->wfx.nChannels;
}
(*ippDS)->wfx.nSamplesPerSec = 22050;
(*ippDS)->wfx.nAvgBytesPerSec = 44100;
(*ippDS)->wfx.nBlockAlign = 2;
(*ippDS)->wfx.wBitsPerSample = 8;
(*ippDS)->wfx.nAvgBytesPerSec = 22050 * (*ippDS)->wfx.nBlockAlign;
/* If the driver requests being opened through MMSYSTEM
* (which is recommended by the DDK), it is supposed to happen