quartz: Silence the directsound buffer on starting.

If the buffer is created and stopped, the contents of the buffer are indeterminate, by zeroing it you won't get leftovers from last play.

quartz: Silence the directsound buffer on starting.
6d965b8f · Maarten Lankhorst · Alexandre Julliard · b1f9acc6 · 6d965b8f
Commit 6d965b8f authored Mar 14, 2008 by Maarten Lankhorst Committed by Alexandre Julliard Mar 15, 2008
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dsoundrender.c dlls/quartz/dsoundrender.c +9 -0

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--- a/dlls/quartz/dsoundrender.c
+++ b/dlls/quartz/dsoundrender.c
@@ -498,6 +498,15 @@ static HRESULT WINAPI DSoundRender_Run(IBaseFilter * iface, REFERENCE_TIME tStar
        /* It's okay if there's no buffer yet. It'll start when it's created */
        if (This->dsbuffer)
        {
+            if (This->state == State_Stopped)
+            {
+                char *buf1;
+                DWORD size1;
+
+                IDirectSoundBuffer_Lock(This->dsbuffer, 0, 0, (void**)&buf1, &size1, NULL, NULL, DSBLOCK_ENTIREBUFFER);
+                memset(buf1, 0, size1);
+                IDirectSoundBuffer_Unlock(This->dsbuffer, buf1, size1, NULL, 0);
+            }
            hr = IDirectSoundBuffer_Play(This->dsbuffer, 0, 0, DSBPLAY_LOOPING);
            if (FAILED(hr))
                ERR("Can't start playing! (%x)\n", hr);