audiorecorder.cpp Example File
audiorecorder/audiorecorder.cpp
#include <QtCore/qdir.h>
#include <QtGui/qfiledialog.h>
#include <qaudiocapturesource.h>
#include <qmediarecorder.h>
#include "audiorecorder.h"
#if defined(Q_WS_MAEMO_5) || defined(Q_WS_MAEMO_6) || defined(SYMBIAN_S60_3X)
#include "ui_audiorecorder_small.h"
#else
#include "ui_audiorecorder.h"
#endif
AudioRecorder::AudioRecorder(QWidget *parent)
:
QMainWindow(parent),
ui(new Ui::AudioRecorder),
outputLocationSet(false)
{
ui->setupUi(this);
audiosource = new QAudioCaptureSource(this);
capture = new QMediaRecorder(audiosource, this);
ui->audioDeviceBox->addItem(tr("Default"), QVariant(QString()));
foreach(const QString &device, audiosource->audioInputs()) {
ui->audioDeviceBox->addItem(device, QVariant(device));
}
ui->audioCodecBox->addItem(tr("Default"), QVariant(QString()));
foreach(const QString &codecName, capture->supportedAudioCodecs()) {
ui->audioCodecBox->addItem(codecName, QVariant(codecName));
}
ui->containerBox->addItem(tr("Default"), QVariant(QString()));
foreach(const QString &containerName, capture->supportedContainers()) {
ui->containerBox->addItem(containerName, QVariant(containerName));
}
ui->sampleRateBox->addItem(tr("Default"), QVariant(0));
foreach(int sampleRate, capture->supportedAudioSampleRates()) {
ui->sampleRateBox->addItem(QString::number(sampleRate), QVariant(
sampleRate));
}
ui->qualitySlider->setRange(0, int(QtMultimediaKit::VeryHighQuality));
ui->qualitySlider->setValue(int(QtMultimediaKit::NormalQuality));
ui->bitrateBox->addItem(QString("Default"), QVariant(0));
ui->bitrateBox->addItem(QString("32000"), QVariant(32000));
ui->bitrateBox->addItem(QString("64000"), QVariant(64000));
ui->bitrateBox->addItem(QString("96000"), QVariant(96000));
ui->bitrateBox->addItem(QString("128000"), QVariant(128000));
connect(capture, SIGNAL(durationChanged(qint64)), this,
SLOT(updateProgress(qint64)));
connect(capture, SIGNAL(stateChanged(QMediaRecorder::State)), this,
SLOT(updateState(QMediaRecorder::State)));
connect(capture, SIGNAL(error(QMediaRecorder::Error)), this,
SLOT(displayErrorMessage()));
}
AudioRecorder::~AudioRecorder()
{
delete capture;
delete audiosource;
}
void AudioRecorder::updateProgress(qint64 duration)
{
if (capture->error() != QMediaRecorder::NoError || duration < 2000)
return;
ui->statusbar->showMessage(tr("Recorded %1 sec").arg(qRound(duration / 1000)));
}
void AudioRecorder::updateState(QMediaRecorder::State state)
{
QString statusMessage;
switch (state) {
case QMediaRecorder::RecordingState:
ui->recordButton->setText(tr("Stop"));
ui->pauseButton->setText(tr("Pause"));
if (capture->outputLocation().isEmpty())
statusMessage = tr("Recording");
else
statusMessage = tr("Recording to %1").arg(
capture->outputLocation().toString());
break;
case QMediaRecorder::PausedState:
ui->recordButton->setText(tr("Stop"));
ui->pauseButton->setText(tr("Resume"));
statusMessage = tr("Paused");
break;
case QMediaRecorder::StoppedState:
ui->recordButton->setText(tr("Record"));
ui->pauseButton->setText(tr("Pause"));
statusMessage = tr("Stopped");
}
ui->pauseButton->setEnabled(state != QMediaRecorder::StoppedState);
if (capture->error() == QMediaRecorder::NoError)
ui->statusbar->showMessage(statusMessage);
}
static QVariant boxValue(const QComboBox *box)
{
int idx = box->currentIndex();
if (idx == -1)
return QVariant();
return box->itemData(idx);
}
void AudioRecorder::toggleRecord()
{
if (capture->state() == QMediaRecorder::StoppedState) {
audiosource->setAudioInput(boxValue(ui->audioDeviceBox).toString());
if (!outputLocationSet)
capture->setOutputLocation(generateAudioFilePath());
QAudioEncoderSettings settings;
settings.setCodec(boxValue(ui->audioCodecBox).toString());
settings.setSampleRate(boxValue(ui->sampleRateBox).toInt());
settings.setBitRate(boxValue(ui->bitrateBox).toInt());
settings.setQuality(QtMultimediaKit::EncodingQuality(ui->qualitySlider->value()));
settings.setEncodingMode(ui->constantQualityRadioButton->isChecked() ?
QtMultimediaKit::ConstantQualityEncoding :
QtMultimediaKit::ConstantBitRateEncoding);
QString container = boxValue(ui->containerBox).toString();
capture->setEncodingSettings(settings, QVideoEncoderSettings(), container);
capture->record();
}
else {
capture->stop();
}
}
void AudioRecorder::togglePause()
{
if (capture->state() != QMediaRecorder::PausedState)
capture->pause();
else
capture->record();
}
void AudioRecorder::setOutputLocation()
{
QString fileName = QFileDialog::getSaveFileName();
capture->setOutputLocation(QUrl(fileName));
outputLocationSet = true;
}
void AudioRecorder::displayErrorMessage()
{
ui->statusbar->showMessage(capture->errorString());
}
QUrl AudioRecorder::generateAudioFilePath()
{
QDir outputDir(QDir::rootPath());
int lastImage = 0;
int fileCount = 0;
foreach(QString fileName, outputDir.entryList(QStringList() << "testclip_*")) {
int imgNumber = fileName.mid(5, fileName.size() - 9).toInt();
lastImage = qMax(lastImage, imgNumber);
if (outputDir.exists(fileName))
fileCount += 1;
}
lastImage += fileCount;
QUrl location(QDir::toNativeSeparators(outputDir.canonicalPath() + QString("/testclip_%1").arg(lastImage + 1, 4, 10, QLatin1Char('0'))));
return location;
}
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