winealsa.drv: Add ability to recover from underruns to directsound driver.

Fixes handling of buffer underruns that might still occur.

winealsa.drv: Add ability to recover from underruns to directsound driver.
2cd62080 · Maarten Lankhorst · Alexandre Julliard · 80c6099b · 2cd62080
Commit 2cd62080 authored Aug 08, 2008 by Maarten Lankhorst Committed by Alexandre Julliard Aug 18, 2008
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dsoutput.c dlls/winealsa.drv/dsoutput.c +7 -1

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--- a/dlls/winealsa.drv/dsoutput.c
+++ b/dlls/winealsa.drv/dsoutput.c
@@ -548,7 +548,13 @@ static HRESULT WINAPI IDsDriverBufferImpl_GetPosition(PIDSDRIVERBUFFER iface,
    }
    if (state == SND_PCM_STATE_RUNNING)
    {
-        snd_pcm_uframes_t used = This->mmap_buflen_frames - snd_pcm_avail_update(This->pcm);
+        snd_pcm_sframes_t used = This->mmap_buflen_frames - snd_pcm_avail_update(This->pcm);
+
+        if (used < 0)
+        {
+            snd_pcm_forward(This->pcm, -used);
+            used = 0;
+        }

        if (This->mmap_pos > used)
            hw_pptr = This->mmap_pos - used;