Ken Thomases : winecoreaudio: Report when the render callback is just providing silence.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 0bb13dd31c40eeda294935285629fced1f6fa3bd
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=0bb13dd31c40eeda294935285629fced1f6fa3bd

Author: Ken Thomases <ken at codeweavers.com>
Date:   Thu Dec 21 03:49:24 2006 -0600

winecoreaudio: Report when the render callback is just providing silence.

---

 dlls/winmm/winecoreaudio/audio.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/dlls/winmm/winecoreaudio/audio.c b/dlls/winmm/winecoreaudio/audio.c
index c967ebb..ae1067a 100644
--- a/dlls/winmm/winecoreaudio/audio.c
+++ b/dlls/winmm/winecoreaudio/audio.c
@@ -63,6 +63,11 @@ WINE_DEFAULT_DEBUG_CHANNEL(wave);
 typedef void *AudioUnit;
 
 /* From AudioUnit/AUComponents.h */
+enum
+{
+    kAudioUnitRenderAction_OutputIsSilence  = (1 << 4),
+        /* provides hint on return from Render(): if set the buffer contains all zeroes */
+};
 typedef UInt32 AudioUnitRenderActionFlags;
 
 /* only allow 10 output devices through this driver, this ought to be adequate */
@@ -1441,6 +1446,8 @@ OSStatus CoreAudio_woAudioUnitIOProc(voi
         }
         else
         {
+            if (!dataProvided)
+                *ioActionFlags |= kAudioUnitRenderAction_OutputIsSilence;
             memset((char*)ioData->mBuffers[0].mData + dataProvided, 0, dataNeeded);
             dataProvided += dataNeeded;
             dataNeeded = 0;