wineoss.drv: Cap reported OSS fill level to expected level.

Some devices apparently return that the buffer contains an extra frame that we never wrote. We should account for that to avoid an integer underflow.

wineoss.drv: Cap reported OSS fill level to expected level.
025e6650 · Andrew Eikum · Alexandre Julliard · 6c073fe9 · 025e6650
Commit 025e6650 authored Apr 06, 2015 by Andrew Eikum Committed by Alexandre Julliard Apr 06, 2015
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mmdevdrv.c dlls/wineoss.drv/mmdevdrv.c +6 -0

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--- a/dlls/wineoss.drv/mmdevdrv.c
+++ b/dlls/wineoss.drv/mmdevdrv.c
@@ -1412,6 +1412,12 @@ static void oss_write_data(ACImpl *This)
    }else
        in_oss_frames = (This->oss_bufsize_bytes - bi.bytes) / This->fmt->nBlockAlign;

+    if(in_oss_frames > This->in_oss_frames){
+        TRACE("Capping reported frames from %u to %u\n",
+                in_oss_frames, This->in_oss_frames);
+        in_oss_frames = This->in_oss_frames;
+    }
+
    write_limit = 0;
    while(write_limit + in_oss_frames < max_period * 3)
        write_limit += max_period;