wasapi: Fix thread affinity

It is expected from the user side that the QIODevice passed to the audio
input/output is handled in the very same thread it has been created in.
Previously we used the worker thread for it. Instead, schedule handling
a buffer to the GUI thread and move on.

This also helps simplifying many of the emits, as they happen in the
same thread as the target device.

Task-number: QTBUG-55894
Change-Id: I552a7a41562dccbaae5681e3c416267165720d30
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/plugins/wasapi/qwasapiaudiooutput.h b/src/plugins/wasapi/qwasapiaudiooutput.h
index 247a07160..118731af9 100644
--- a/src/plugins/wasapi/qwasapiaudiooutput.h
+++ b/src/plugins/wasapi/qwasapiaudiooutput.h
@@ -89,6 +89,8 @@ public:
     qreal volume() const Q_DECL_OVERRIDE;
 
     void process();
+public slots:
+    void processBuffer();
 private:
     bool initStart(bool pull);
     friend class WasapiOutputDevicePrivate;
@@ -113,6 +115,7 @@ private:
     quint32 m_bufferBytes;
     HANDLE m_event;
     QWasapiProcessThread *m_eventThread;
+    QAtomicInt m_processing;
     QIODevice *m_eventDevice;
 };