select a better buffer size for QAudioInput / QAudioOutput

1 files changed, 6 insertions, 1 deletions

diff --git a/examples/example_4_callHandling/xmppClient.cpp b/examples/example_4_callHandling/xmppClient.cpp
index db3ee820..5a09852d 100644
--- a/examples/example_4_callHandling/xmppClient.cpp
+++ b/examples/example_4_callHandling/xmppClient.cpp
@@ -84,13 +84,18 @@ void xmppClient::slotConnected()
     format.setByteOrder(QAudioFormat::LittleEndian);
     format.setSampleType(QAudioFormat::SignedInt);
 
+    // the size in bytes of the audio samples for a single RTP packet
+    const int packetSize = (format.frequency() * format.channels() * (format.sampleSize() / 8)) * channel->payloadType().ptime() / 1000;
+
     // initialise audio output
     QAudioOutput *audioOutput = new QAudioOutput(format, this);
+    audioOutput->setBufferSize(2 * packetSize);
     audioOutput->start(channel);
 
     // initialise audio input
     QAudioInput *audioInput = new QAudioInput(format, this);
-    audioInput->start(channel); 
+    audioInput->setBufferSize(2 * packetSize);
+    audioInput->start(channel);
 }
 
 /// A call finished.