--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/multimedia/audio/qaudiooutput_alsa_p.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,736 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+// W A R N I N G
+// -------------
+//
+// This file is not part of the Qt API. It exists for the convenience
+// of other Qt classes. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qcoreapplication.h>
+#include "qaudiooutput_alsa_p.h"
+
+QT_BEGIN_NAMESPACE
+
+//#define DEBUG_AUDIO 1
+
+static const int minimumIntervalTime = 50;
+
+QAudioOutputPrivate::QAudioOutputPrivate(const QByteArray &device, const QAudioFormat& audioFormat):
+ settings(audioFormat)
+{
+ bytesAvailable = 0;
+ handle = 0;
+ ahandler = 0;
+ access = SND_PCM_ACCESS_RW_INTERLEAVED;
+ pcmformat = SND_PCM_FORMAT_S16;
+ buffer_frames = 0;
+ period_frames = 0;
+ buffer_size = 0;
+ period_size = 0;
+ buffer_time = 100000;
+ period_time = 20000;
+ totalTimeValue = 0;
+ intervalTime = 1000;
+ audioBuffer = 0;
+ errorState = QAudio::NoError;
+ deviceState = QAudio::StopState;
+ audioSource = 0;
+ pullMode = true;
+ resuming = false;
+ opened = false;
+
+ QStringList list1 = QString(QLatin1String(device)).split(QLatin1String(":"));
+ m_device = QByteArray(list1.at(0).toLocal8Bit().constData());
+
+ timer = new QTimer(this);
+ connect(timer,SIGNAL(timeout()),SLOT(userFeed()));
+}
+
+QAudioOutputPrivate::~QAudioOutputPrivate()
+{
+ close();
+ disconnect(timer, SIGNAL(timeout()));
+ QCoreApplication::processEvents();
+ delete timer;
+}
+
+QAudio::Error QAudioOutputPrivate::error() const
+{
+ return errorState;
+}
+
+QAudio::State QAudioOutputPrivate::state() const
+{
+ return deviceState;
+}
+
+void QAudioOutputPrivate::async_callback(snd_async_handler_t *ahandler)
+{
+ QAudioOutputPrivate* audioOut;
+
+ audioOut = static_cast<QAudioOutputPrivate*>
+ (snd_async_handler_get_callback_private(ahandler));
+
+ if((audioOut->deviceState==QAudio::ActiveState)||(audioOut->resuming))
+ audioOut->feedback();
+}
+
+int QAudioOutputPrivate::xrun_recovery(int err)
+{
+ int count = 0;
+ bool reset = false;
+
+ if(err == -EPIPE) {
+ errorState = QAudio::UnderrunError;
+ err = snd_pcm_prepare(handle);
+ if(err < 0)
+ reset = true;
+
+ } else if((err == -ESTRPIPE)||(err == -EIO)) {
+ errorState = QAudio::IOError;
+ while((err = snd_pcm_resume(handle)) == -EAGAIN){
+ usleep(100);
+ count++;
+ if(count > 5) {
+ reset = true;
+ break;
+ }
+ }
+ if(err < 0) {
+ err = snd_pcm_prepare(handle);
+ if(err < 0)
+ reset = true;
+ }
+ }
+ if(reset) {
+ close();
+ open();
+ snd_pcm_prepare(handle);
+ return 0;
+ }
+ return err;
+}
+
+int QAudioOutputPrivate::setFormat()
+{
+ snd_pcm_format_t pcmformat = SND_PCM_FORMAT_S16;
+
+ if(settings.sampleSize() == 8) {
+ pcmformat = SND_PCM_FORMAT_U8;
+
+ } else if(settings.sampleSize() == 16) {
+ if(settings.sampleType() == QAudioFormat::SignedInt) {
+ if(settings.byteOrder() == QAudioFormat::LittleEndian)
+ pcmformat = SND_PCM_FORMAT_S16_LE;
+ else
+ pcmformat = SND_PCM_FORMAT_S16_BE;
+ } else if(settings.sampleType() == QAudioFormat::UnSignedInt) {
+ if(settings.byteOrder() == QAudioFormat::LittleEndian)
+ pcmformat = SND_PCM_FORMAT_U16_LE;
+ else
+ pcmformat = SND_PCM_FORMAT_U16_BE;
+ }
+ } else if(settings.sampleSize() == 24) {
+ if(settings.sampleType() == QAudioFormat::SignedInt) {
+ if(settings.byteOrder() == QAudioFormat::LittleEndian)
+ pcmformat = SND_PCM_FORMAT_S24_LE;
+ else
+ pcmformat = SND_PCM_FORMAT_S24_BE;
+ } else if(settings.sampleType() == QAudioFormat::UnSignedInt) {
+ if(settings.byteOrder() == QAudioFormat::LittleEndian)
+ pcmformat = SND_PCM_FORMAT_U24_LE;
+ else
+ pcmformat = SND_PCM_FORMAT_U24_BE;
+ }
+ } else if(settings.sampleSize() == 32) {
+ if(settings.sampleType() == QAudioFormat::SignedInt) {
+ if(settings.byteOrder() == QAudioFormat::LittleEndian)
+ pcmformat = SND_PCM_FORMAT_S32_LE;
+ else
+ pcmformat = SND_PCM_FORMAT_S32_BE;
+ } else if(settings.sampleType() == QAudioFormat::UnSignedInt) {
+ if(settings.byteOrder() == QAudioFormat::LittleEndian)
+ pcmformat = SND_PCM_FORMAT_U32_LE;
+ else
+ pcmformat = SND_PCM_FORMAT_U32_BE;
+ } else if(settings.sampleType() == QAudioFormat::Float) {
+ if(settings.byteOrder() == QAudioFormat::LittleEndian)
+ pcmformat = SND_PCM_FORMAT_FLOAT_LE;
+ else
+ pcmformat = SND_PCM_FORMAT_FLOAT_BE;
+ }
+ } else if(settings.sampleSize() == 64) {
+ if(settings.byteOrder() == QAudioFormat::LittleEndian)
+ pcmformat = SND_PCM_FORMAT_FLOAT64_LE;
+ else
+ pcmformat = SND_PCM_FORMAT_FLOAT64_BE;
+ }
+
+ return snd_pcm_hw_params_set_format( handle, hwparams, pcmformat);
+}
+
+QIODevice* QAudioOutputPrivate::start(QIODevice* device)
+{
+ if(deviceState != QAudio::StopState)
+ deviceState = QAudio::StopState;
+
+ errorState = QAudio::NoError;
+
+ // Handle change of mode
+ if(audioSource && pullMode && !device) {
+ // pull -> push
+ close();
+ audioSource = 0;
+ } else if(audioSource && !pullMode && device) {
+ // push -> pull
+ close();
+ delete audioSource;
+ audioSource = 0;
+ }
+
+ if(device) {
+ //set to pull mode
+ pullMode = true;
+ audioSource = device;
+ deviceState = QAudio::ActiveState;
+ } else {
+ //set to push mode
+ if(!audioSource) {
+ audioSource = new OutputPrivate(this);
+ audioSource->open(QIODevice::WriteOnly|QIODevice::Unbuffered);
+ }
+ pullMode = false;
+ deviceState = QAudio::IdleState;
+ }
+
+ open();
+
+ emit stateChanged(deviceState);
+
+ return audioSource;
+}
+
+void QAudioOutputPrivate::stop()
+{
+ if(deviceState == QAudio::StopState)
+ return;
+ deviceState = QAudio::StopState;
+ close();
+ emit stateChanged(deviceState);
+}
+
+bool QAudioOutputPrivate::open()
+{
+ if(opened)
+ return true;
+
+#ifdef DEBUG_AUDIO
+ QTime now(QTime::currentTime());
+ qDebug()<<now.second()<<"s "<<now.msec()<<"ms :open()";
+#endif
+ timeStamp.restart();
+ elapsedTimeOffset = 0;
+
+ int dir;
+ int err=-1;
+ int count=0;
+ unsigned int freakuency=settings.frequency();
+
+ QString dev = QLatin1String(m_device.constData());
+ if(!dev.contains(QLatin1String("default"))) {
+#if(SND_LIB_MAJOR == 1 && SND_LIB_MINOR == 0 && SND_LIB_SUBMINOR >= 14)
+ dev = QString(QLatin1String("default:CARD=%1")).arg(QLatin1String(m_device.constData()));
+#else
+ int idx = 0;
+ char *name;
+
+ while(snd_card_get_name(idx,&name) == 0) {
+ if(m_device.contains(name))
+ break;
+ idx++;
+ }
+ dev = QString(QLatin1String("hw:%1,0")).arg(idx);
+#endif
+ }
+ // Step 1: try and open the device
+ while((count < 5) && (err < 0)) {
+ err=snd_pcm_open(&handle,dev.toLocal8Bit().constData(),SND_PCM_STREAM_PLAYBACK,0);
+ if(err < 0)
+ count++;
+ }
+ if (( err < 0)||(handle == 0)) {
+ errorState = QAudio::OpenError;
+ deviceState = QAudio::StopState;
+ return false;
+ }
+ snd_pcm_nonblock( handle, 0 );
+
+ // Step 2: Set the desired HW parameters.
+ snd_pcm_hw_params_alloca( &hwparams );
+
+ bool fatal = false;
+ QString errMessage;
+ unsigned int chunks = 8;
+
+ err = snd_pcm_hw_params_any( handle, hwparams );
+ if ( err < 0 ) {
+ fatal = true;
+ errMessage = QString::fromLatin1("QAudioOutput: snd_pcm_hw_params_any: err = %1").arg(err);
+ }
+ if ( !fatal ) {
+ err = snd_pcm_hw_params_set_rate_resample( handle, hwparams, 1 );
+ if ( err < 0 ) {
+ fatal = true;
+ errMessage = QString::fromLatin1("QAudioOutput: snd_pcm_hw_params_set_rate_resample: err = %1").arg(err);
+ }
+ }
+ if ( !fatal ) {
+ err = snd_pcm_hw_params_set_access( handle, hwparams, access );
+ if ( err < 0 ) {
+ fatal = true;
+ errMessage = QString::fromLatin1("QAudioOutput: snd_pcm_hw_params_set_access: err = %1").arg(err);
+ }
+ }
+ if ( !fatal ) {
+ err = setFormat();
+ if ( err < 0 ) {
+ fatal = true;
+ errMessage = QString::fromLatin1("QAudioOutput: snd_pcm_hw_params_set_format: err = %1").arg(err);
+ }
+ }
+ if ( !fatal ) {
+ err = snd_pcm_hw_params_set_channels( handle, hwparams, (unsigned int)settings.channels() );
+ if ( err < 0 ) {
+ fatal = true;
+ errMessage = QString::fromLatin1("QAudioOutput: snd_pcm_hw_params_set_channels: err = %1").arg(err);
+ }
+ }
+ if ( !fatal ) {
+ err = snd_pcm_hw_params_set_rate_near( handle, hwparams, &freakuency, 0 );
+ if ( err < 0 ) {
+ fatal = true;
+ errMessage = QString::fromLatin1("QAudioOutput: snd_pcm_hw_params_set_rate_near: err = %1").arg(err);
+ }
+ }
+ if ( !fatal ) {
+ err = snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, &dir);
+ if ( err < 0 ) {
+ fatal = true;
+ errMessage = QString::fromLatin1("QAudioOutput: snd_pcm_hw_params_set_buffer_time_near: err = %1").arg(err);
+ }
+ }
+ if ( !fatal ) {
+ err = snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, &dir);
+ if ( err < 0 ) {
+ fatal = true;
+ errMessage = QString::fromLatin1("QAudioOutput: snd_pcm_hw_params_set_period_time_near: err = %1").arg(err);
+ }
+ }
+ if ( !fatal ) {
+ err = snd_pcm_hw_params_set_periods_near(handle, hwparams, &chunks, &dir);
+ if ( err < 0 ) {
+ fatal = true;
+ errMessage = QString::fromLatin1("QAudioOutput: snd_pcm_hw_params_set_periods_near: err = %1").arg(err);
+ }
+ }
+ if ( !fatal ) {
+ err = snd_pcm_hw_params(handle, hwparams);
+ if ( err < 0 ) {
+ fatal = true;
+ errMessage = QString::fromLatin1("QAudioOutput: snd_pcm_hw_params: err = %1").arg(err);
+ }
+ }
+ if( err < 0) {
+ qWarning()<<errMessage;
+ errorState = QAudio::OpenError;
+ deviceState = QAudio::StopState;
+ return false;
+ }
+ snd_pcm_hw_params_get_buffer_size(hwparams,&buffer_frames);
+ buffer_size = snd_pcm_frames_to_bytes(handle,buffer_frames);
+ snd_pcm_hw_params_get_period_size(hwparams,&period_frames, &dir);
+ period_size = snd_pcm_frames_to_bytes(handle,period_frames);
+ snd_pcm_hw_params_get_buffer_time(hwparams,&buffer_time, &dir);
+ snd_pcm_hw_params_get_period_time(hwparams,&period_time, &dir);
+
+ // Step 3: Set the desired SW parameters.
+ snd_pcm_sw_params_t *swparams;
+ snd_pcm_sw_params_alloca(&swparams);
+ snd_pcm_sw_params_current(handle, swparams);
+ snd_pcm_sw_params_set_start_threshold(handle,swparams,period_frames);
+ snd_pcm_sw_params_set_stop_threshold(handle,swparams,buffer_frames);
+ snd_pcm_sw_params_set_avail_min(handle, swparams,period_frames);
+ snd_pcm_sw_params(handle, swparams);
+
+ // Step 4: Prepare audio
+ if(audioBuffer == 0)
+ audioBuffer = new char[snd_pcm_frames_to_bytes(handle,buffer_frames)];
+ snd_pcm_prepare( handle );
+ snd_pcm_start(handle);
+
+ // Step 5: Setup callback and timer fallback
+ snd_async_add_pcm_handler(&ahandler, handle, async_callback, this);
+ bytesAvailable = bytesFree();
+
+ // Step 6: Start audio processing
+ timer->start(period_time/1000);
+
+ clockStamp.restart();
+ timeStamp.restart();
+ elapsedTimeOffset = 0;
+ errorState = QAudio::NoError;
+ totalTimeValue = 0;
+ opened = true;
+
+ return true;
+}
+
+void QAudioOutputPrivate::close()
+{
+ deviceState = QAudio::StopState;
+ timer->stop();
+
+ if ( handle ) {
+ snd_pcm_drain( handle );
+ snd_pcm_close( handle );
+ handle = 0;
+ delete [] audioBuffer;
+ audioBuffer=0;
+ }
+ if(!pullMode && audioSource) {
+ delete audioSource;
+ audioSource = 0;
+ }
+ opened = false;
+}
+
+int QAudioOutputPrivate::bytesFree() const
+{
+ if(resuming)
+ return period_size;
+
+ if(deviceState != QAudio::ActiveState && deviceState != QAudio::IdleState)
+ return 0;
+ int frames = snd_pcm_avail_update(handle);
+ if((int)frames > (int)buffer_frames)
+ frames = buffer_frames;
+
+ return snd_pcm_frames_to_bytes(handle, frames);
+}
+
+qint64 QAudioOutputPrivate::write( const char *data, qint64 len )
+{
+ // Write out some audio data
+ if ( !handle )
+ return 0;
+#ifdef DEBUG_AUDIO
+ qDebug()<<"frames to write out = "<<
+ snd_pcm_bytes_to_frames( handle, (int)len )<<" ("<<len<<") bytes";
+#endif
+ int frames, err;
+ int space = bytesFree();
+ if(len < space) {
+ // Just write it
+ frames = snd_pcm_bytes_to_frames( handle, (int)len );
+ err = snd_pcm_writei( handle, data, frames );
+ } else {
+ // Only write space worth
+ frames = snd_pcm_bytes_to_frames( handle, (int)space );
+ err = snd_pcm_writei( handle, data, frames );
+ }
+ if(err > 0) {
+ totalTimeValue += err*1000000/settings.frequency();
+ resuming = false;
+ errorState = QAudio::NoError;
+ deviceState = QAudio::ActiveState;
+ return snd_pcm_frames_to_bytes( handle, err );
+ } else
+ err = xrun_recovery(err);
+
+ if(err < 0) {
+ close();
+ errorState = QAudio::FatalError;
+ deviceState = QAudio::StopState;
+ emit stateChanged(deviceState);
+ }
+ return 0;
+}
+
+int QAudioOutputPrivate::periodSize() const
+{
+ return period_size;
+}
+
+void QAudioOutputPrivate::setBufferSize(int value)
+{
+ if(deviceState == QAudio::StopState)
+ buffer_size = value;
+}
+
+int QAudioOutputPrivate::bufferSize() const
+{
+ return buffer_size;
+}
+
+void QAudioOutputPrivate::setNotifyInterval(int ms)
+{
+ if(ms >= minimumIntervalTime)
+ intervalTime = ms;
+ else
+ intervalTime = minimumIntervalTime;
+}
+
+int QAudioOutputPrivate::notifyInterval() const
+{
+ return intervalTime;
+}
+
+qint64 QAudioOutputPrivate::totalTime() const
+{
+ return totalTimeValue;
+}
+
+void QAudioOutputPrivate::resume()
+{
+ if(deviceState == QAudio::SuspendState) {
+ int err = 0;
+
+ if(handle) {
+ err = snd_pcm_prepare( handle );
+ if(err < 0)
+ xrun_recovery(err);
+
+ err = snd_pcm_start(handle);
+ if(err < 0)
+ xrun_recovery(err);
+
+ bytesAvailable = (int)snd_pcm_frames_to_bytes(handle, buffer_frames);
+ }
+ resuming = true;
+ if(pullMode)
+ deviceState = QAudio::ActiveState;
+ else
+ deviceState = QAudio::IdleState;
+
+ errorState = QAudio::NoError;
+ timer->start(period_time/1000);
+ emit stateChanged(deviceState);
+ }
+}
+
+QAudioFormat QAudioOutputPrivate::format() const
+{
+ return settings;
+}
+
+void QAudioOutputPrivate::suspend()
+{
+ if(deviceState == QAudio::ActiveState || deviceState == QAudio::IdleState || resuming) {
+ timer->stop();
+ deviceState = QAudio::SuspendState;
+ errorState = QAudio::NoError;
+ emit stateChanged(deviceState);
+ }
+}
+
+void QAudioOutputPrivate::userFeed()
+{
+ if(deviceState == QAudio::StopState || deviceState == QAudio::SuspendState)
+ return;
+#ifdef DEBUG_AUDIO
+ QTime now(QTime::currentTime());
+ qDebug()<<now.second()<<"s "<<now.msec()<<"ms :userFeed() OUT";
+#endif
+ if(deviceState == QAudio::IdleState)
+ bytesAvailable = bytesFree();
+
+ deviceReady();
+}
+
+void QAudioOutputPrivate::feedback()
+{
+ QMetaObject::invokeMethod(this, SLOT(updateAvailable()), Qt::QueuedConnection);
+}
+
+void QAudioOutputPrivate::updateAvailable()
+{
+#ifdef DEBUG_AUDIO
+ QTime now(QTime::currentTime());
+ qDebug()<<now.second()<<"s "<<now.msec()<<"ms :updateAvailable()";
+#endif
+ bytesAvailable = bytesFree();
+}
+
+bool QAudioOutputPrivate::deviceReady()
+{
+ if(pullMode) {
+ int l = 0;
+ int chunks = bytesAvailable/period_size;
+ if(chunks==0) {
+ bytesAvailable = bytesFree();
+ return false;
+ }
+#ifdef DEBUG_AUDIO
+ qDebug()<<"deviceReady() avail="<<bytesAvailable<<" bytes, period size="<<period_size<<" bytes";
+ qDebug()<<"deviceReady() no. of chunks that can fit ="<<chunks<<", chunks in bytes ="<<period_size*chunks;
+#endif
+ int input = period_frames*chunks;
+ if(input > (int)buffer_frames)
+ input = buffer_frames;
+ l = audioSource->read(audioBuffer,snd_pcm_frames_to_bytes(handle, input));
+ if(l > 0) {
+ // Got some data to output
+ if(deviceState != QAudio::ActiveState)
+ return true;
+ write(audioBuffer,l);
+ bytesAvailable = bytesFree();
+
+ } else if(l == 0) {
+ // Did not get any data to output
+ bytesAvailable = bytesFree();
+ if(bytesAvailable > snd_pcm_frames_to_bytes(handle, buffer_frames-period_frames)) {
+ // Underrun
+ errorState = QAudio::UnderrunError;
+ deviceState = QAudio::IdleState;
+ emit stateChanged(deviceState);
+ }
+
+ } else if(l < 0) {
+ close();
+ errorState = QAudio::IOError;
+ emit stateChanged(deviceState);
+ }
+ } else
+ bytesAvailable = bytesFree();
+
+ if(deviceState != QAudio::ActiveState)
+ return true;
+
+ if((timeStamp.elapsed() + elapsedTimeOffset) > intervalTime) {
+ emit notify();
+ elapsedTimeOffset = timeStamp.elapsed() + elapsedTimeOffset - intervalTime;
+ timeStamp.restart();
+ }
+ return true;
+}
+
+qint64 QAudioOutputPrivate::clock() const
+{
+ if(!handle)
+ return 0;
+
+ if (deviceState == QAudio::StopState)
+ return 0;
+
+#if(SND_LIB_MAJOR == 1 && SND_LIB_MINOR == 0 && SND_LIB_SUBMINOR >= 14)
+ snd_pcm_status_t* status;
+ snd_pcm_status_alloca(&status);
+
+ snd_timestamp_t t1,t2;
+ if( snd_pcm_status(handle, status) >= 0) {
+ snd_pcm_status_get_tstamp(status,&t1);
+ snd_pcm_status_get_trigger_tstamp(status,&t2);
+ t1.tv_sec-=t2.tv_sec;
+
+ signed long l = (signed long)t1.tv_usec - (signed long)t2.tv_usec;
+ if(l < 0) {
+ t1.tv_sec--;
+ l = -l;
+ l %= 1000000;
+ }
+ return ((t1.tv_sec * 1000000)+l);
+ } else
+ return 0;
+#else
+ return clockStamp.elapsed()*1000;
+#endif
+ return 0;
+}
+
+void QAudioOutputPrivate::reset()
+{
+ if(handle)
+ snd_pcm_reset(handle);
+
+ stop();
+}
+
+OutputPrivate::OutputPrivate(QAudioOutputPrivate* audio)
+{
+ audioDevice = qobject_cast<QAudioOutputPrivate*>(audio);
+}
+
+OutputPrivate::~OutputPrivate() {}
+
+qint64 OutputPrivate::readData( char* data, qint64 len)
+{
+ Q_UNUSED(data)
+ Q_UNUSED(len)
+
+ return 0;
+}
+
+qint64 OutputPrivate::writeData(const char* data, qint64 len)
+{
+ int retry = 0;
+ qint64 written = 0;
+ if((audioDevice->deviceState == QAudio::ActiveState)
+ ||(audioDevice->deviceState == QAudio::IdleState)) {
+ while(written < len) {
+ int chunk = audioDevice->write(data+written,(len-written));
+ if(chunk <= 0)
+ retry++;
+ written+=chunk;
+ if(retry > 10)
+ return written;
+ }
+ }
+ return written;
+
+}
+
+QT_END_NAMESPACE