From b7ef079177ceec96f821393796c6c5b14c21704e Mon Sep 17 00:00:00 2001
From: Kurt Korbatits <kurt.korbatits@nokia.com>
Date: Fri, 12 Mar 2010 09:31:57 +1000
Subject: QAudioInput sometimes not writing to QIODevice Handle error recovery
 better.

Task-number:QTBUG-8893
Reviewed-by:Derick Hawcroft
---
 src/multimedia/audio/qaudioinput_alsa_p.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/multimedia/audio/qaudioinput_alsa_p.cpp b/src/multimedia/audio/qaudioinput_alsa_p.cpp
index 5eb23d0..ead9995 100644
--- a/src/multimedia/audio/qaudioinput_alsa_p.cpp
+++ b/src/multimedia/audio/qaudioinput_alsa_p.cpp
@@ -121,6 +121,11 @@ int QAudioInputPrivate::xrun_recovery(int err)
         err = snd_pcm_prepare(handle);
         if(err < 0)
             reset = true;
+        else {
+            bytesAvailable = bytesReady();
+            if (bytesAvailable <= 0)
+                reset = true;
+        }
 
     } else if((err == -ESTRPIPE)||(err == -EIO)) {
         errorState = QAudio::IOError;
@@ -443,6 +448,7 @@ int QAudioInputPrivate::bytesReady() const
     if(deviceState != QAudio::ActiveState && deviceState != QAudio::IdleState)
         return 0;
     int frames = snd_pcm_avail_update(handle);
+    if (frames < 0) return frames;
     if((int)frames > (int)buffer_frames)
         frames = buffer_frames;
 
@@ -459,6 +465,20 @@ qint64 QAudioInputPrivate::read(char* data, qint64 len)
 
     bytesAvailable = bytesReady();
 
+    if (bytesAvailable < 0) {
+        // bytesAvailable as negative is error code, try to recover from it.
+        xrun_recovery(bytesAvailable);
+        bytesAvailable = bytesReady();
+        if (bytesAvailable < 0) {
+            // recovery failed must stop and set error.
+            close();
+            errorState = QAudio::IOError;
+            deviceState = QAudio::StoppedState;
+            emit stateChanged(deviceState);
+            return 0;
+        }
+    }
+
     int count=0, err = 0;
     while(count < 5) {
         int chunks = bytesAvailable/period_size;
-- 
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