From 64a0e58b40e7ee8422d56279882caeeb14152b2b Mon Sep 17 00:00:00 2001
From: Jeremy Lainé <jeremy.laine@m4x.org>
Date: Fri, 10 Dec 2010 08:09:42 +0000
Subject: select a better buffer size for QAudioInput / QAudioOutput

---
 examples/example_4_callHandling/xmppClient.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'examples/example_4_callHandling/xmppClient.cpp')

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.
-- 
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