Fix audiolevels slow framerate in mac

Making the audio input buffer smaller in mac as it seems not to call
writeData until buffer is full.

Change-Id: I198abef235d5b473161d9696c007261828e11b56
Reviewed-by: Tomi Korpipää <tomi.korpipaa@digia.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/examples/audiolevels/audiolevels.cpp b/examples/audiolevels/audiolevels.cpp
index d2038630..e1788936 100644
--- a/examples/audiolevels/audiolevels.cpp
+++ b/examples/audiolevels/audiolevels.cpp
@@ -57,6 +57,12 @@ AudioLevels::AudioLevels(Q3DBars *graph, QObject *parent)
 
     QAudioDeviceInfo inputDevices = QAudioDeviceInfo::defaultInputDevice();
     m_audioInput = new QAudioInput(inputDevices, formatAudio, this);
+#ifdef Q_OS_MAC
+    // Mac seems to wait for entire buffer to fill before calling writeData, so use smaller buffer
+    m_audioInput->setBufferSize(256);
+#else
+    m_audioInput->setBufferSize(1024);
+#endif
 
     m_device = new AudioLevelsIODevice(m_graph->activeDataProxy(), this);
     m_device->open(QIODevice::WriteOnly);