--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/examples/multimedia/audiooutput/audiooutput.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,270 @@
+/****************************************************************************
+**
+** 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 examples 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QDebug>
+#include <QVBoxLayout>
+
+#include <QAudioOutput>
+#include <QAudioDeviceInfo>
+#include "audiooutput.h"
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+#define SECONDS 1
+#define FREQ 600
+#define SYSTEM_FREQ 44100
+
+Generator::Generator(QObject *parent)
+ :QIODevice( parent )
+{
+ finished = false;
+ buffer = new char[SECONDS*SYSTEM_FREQ*4+1000];
+ t=buffer;
+ len=fillData(t,FREQ,SECONDS); /* mono FREQHz sine */
+ pos = 0;
+ total = len;
+}
+
+Generator::~Generator()
+{
+ delete [] buffer;
+}
+
+void Generator::start()
+{
+ open(QIODevice::ReadOnly);
+}
+
+void Generator::stop()
+{
+ close();
+}
+
+int Generator::putShort(char *t, unsigned int value)
+{
+ *(unsigned char *)(t++)=value&255;
+ *(unsigned char *)(t)=(value/256)&255;
+ return 2;
+}
+
+int Generator::fillData(char *start, int frequency, int seconds)
+{
+ int i, len=0;
+ int value;
+ for(i=0; i<seconds*SYSTEM_FREQ; i++) {
+ value=(int)(32767.0*sin(2.0*M_PI*((double)(i))*(double)(frequency)/SYSTEM_FREQ));
+ putShort(start, value);
+ start += 4;
+ len+=2;
+ }
+ return len;
+}
+
+qint64 Generator::readData(char *data, qint64 maxlen)
+{
+ int len = maxlen;
+ if(len > 16384)
+ len = 16384;
+
+ if(len < (SECONDS*SYSTEM_FREQ*2)-pos) {
+ // Normal
+ memcpy(data,t+pos,len);
+ pos+=len;
+ return len;
+ } else {
+ // Whats left and reset to start
+ qint64 left = (SECONDS*SYSTEM_FREQ*2)-pos;
+ memcpy(data,t+pos,left);
+ pos=0;
+ return left;
+ }
+}
+
+qint64 Generator::writeData(const char *data, qint64 len)
+{
+ Q_UNUSED(data);
+ Q_UNUSED(len);
+
+ return 0;
+}
+
+AudioTest::AudioTest()
+{
+ QWidget *window = new QWidget;
+ QVBoxLayout* layout = new QVBoxLayout;
+
+ deviceBox = new QComboBox(this);
+ foreach (const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo::deviceList(QAudio::AudioOutput))
+ deviceBox->addItem(deviceInfo.deviceName(), qVariantFromValue(deviceInfo));
+ connect(deviceBox,SIGNAL(activated(int)),SLOT(deviceChanged(int)));
+ layout->addWidget(deviceBox);
+
+ button = new QPushButton(this);
+ button->setText(tr("Click for Push Mode"));
+ connect(button,SIGNAL(clicked()),SLOT(toggle()));
+ layout->addWidget(button);
+
+ button2 = new QPushButton(this);
+ button2->setText(tr("Click To Suspend"));
+ connect(button2,SIGNAL(clicked()),SLOT(togglePlay()));
+ layout->addWidget(button2);
+
+ window->setLayout(layout);
+ setCentralWidget(window);
+ window->show();
+
+ buffer = new char[BUFFER_SIZE];
+
+ gen = new Generator(this);
+
+ pullMode = true;
+
+ timer = new QTimer(this);
+ connect(timer,SIGNAL(timeout()),SLOT(writeMore()));
+
+ gen->start();
+
+ settings.setFrequency(SYSTEM_FREQ);
+ settings.setChannels(1);
+ settings.setSampleSize(16);
+ settings.setCodec("audio/pcm");
+ settings.setByteOrder(QAudioFormat::LittleEndian);
+ settings.setSampleType(QAudioFormat::SignedInt);
+ audioOutput = new QAudioOutput(settings,this);
+ connect(audioOutput,SIGNAL(notify()),SLOT(status()));
+ connect(audioOutput,SIGNAL(stateChanged(QAudio::State)),SLOT(state(QAudio::State)));
+
+ audioOutput->start(gen);
+}
+
+AudioTest::~AudioTest()
+{
+ delete [] buffer;
+}
+
+void AudioTest::deviceChanged(int idx)
+{
+ timer->stop();
+ gen->stop();
+ audioOutput->stop();
+ audioOutput->disconnect(this);
+ delete audioOutput;
+
+ device = deviceBox->itemData(idx).value<QAudioDeviceInfo>();
+ audioOutput = new QAudioOutput(device,settings,this);
+ connect(audioOutput,SIGNAL(notify()),SLOT(status()));
+ connect(audioOutput,SIGNAL(stateChanged(QAudio::State)),SLOT(state(QAudio::State)));
+ gen->start();
+ audioOutput->start(gen);
+}
+
+void AudioTest::status()
+{
+ qWarning()<<"byteFree = "<<audioOutput->bytesFree()<<" bytes, clock = "<<audioOutput->clock()/1000<<"ms, totalTime = "<<audioOutput->totalTime()/1000<<"ms";
+}
+
+void AudioTest::writeMore()
+{
+ if(!audioOutput)
+ return;
+
+ if(audioOutput->state() == QAudio::StopState)
+ return;
+
+ int l;
+ int out;
+
+ int chunks = audioOutput->bytesFree()/audioOutput->periodSize();
+ while(chunks) {
+ l = gen->read(buffer,audioOutput->periodSize());
+ if(l > 0)
+ out = output->write(buffer,l);
+ if(l != audioOutput->periodSize())
+ break;
+ chunks--;
+ }
+}
+
+void AudioTest::toggle()
+{
+ // Change between pull and push modes
+
+ timer->stop();
+ audioOutput->stop();
+
+ if (pullMode) {
+ button->setText("Click for Pull Mode");
+ output = audioOutput->start(0);
+ pullMode = false;
+ timer->start(20);
+ } else {
+ button->setText("Click for Push Mode");
+ pullMode = true;
+ audioOutput->start(gen);
+ }
+}
+
+void AudioTest::togglePlay()
+{
+ // toggle suspend/resume
+ if(audioOutput->state() == QAudio::SuspendState) {
+ qWarning()<<"status: Suspended, resume()";
+ audioOutput->resume();
+ button2->setText("Click To Suspend");
+ } else if (audioOutput->state() == QAudio::ActiveState) {
+ qWarning()<<"status: Active, suspend()";
+ audioOutput->suspend();
+ button2->setText("Click To Resume");
+ } else if (audioOutput->state() == QAudio::StopState) {
+ qWarning()<<"status: Stopped, resume()";
+ audioOutput->resume();
+ button2->setText("Click To Suspend");
+ } else if (audioOutput->state() == QAudio::IdleState) {
+ qWarning()<<"status: IdleState";
+ }
+}
+
+void AudioTest::state(QAudio::State state)
+{
+ qWarning()<<" state="<<state;
+}