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Diffstat (limited to 'examples/multimedia/audiooutput/audiooutput.cpp')
| -rw-r--r-- | examples/multimedia/audiooutput/audiooutput.cpp | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/examples/multimedia/audiooutput/audiooutput.cpp b/examples/multimedia/audiooutput/audiooutput.cpp new file mode 100644 index 0000000..9e532cd --- /dev/null +++ b/examples/multimedia/audiooutput/audiooutput.cpp @@ -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()<<"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; +} |