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Improve audiorecorder example.

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- Possibility to select channel count
- Show audio level for unsigned integer samples
- Show audio level for each channel
- Correctly set output file location
- Update controls depending on the recorder status (rather than the state)

Change-Id: Ieb08c379bb01a11ce1aa52a9d92ea1f320c87d49
Reviewed-by: Christian Stromme <christian.stromme@digia.com>
This commit is contained in:
Yoann Lopes
2013-10-04 17:02:18 +02:00
committed by The Qt Project
parent 7c9ff56f2f
commit a1cd3c9274
5 changed files with 226 additions and 132 deletions
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180
examples/multimedia/audiorecorder/audiorecorder.cpp
View File

@@ -45,6 +45,7 @@
#include <QMediaRecorder>
#include "audiorecorder.h"
#include "qaudiolevel.h"
#if defined(Q_WS_MAEMO_6)
#include "ui_audiorecorder_small.h"
@@ -53,10 +54,10 @@
#endif
static qreal getPeakValue(const QAudioFormat &format);
static qreal getBufferLevel(const QAudioBuffer &buffer);
static QVector<qreal> getBufferLevels(const QAudioBuffer &buffer);
template <class T>
static qreal getBufferLevel(const T *buffer, int samples);
static QVector<qreal> getBufferLevels(const T *buffer, int frames, int channels);
AudioRecorder::AudioRecorder(QWidget *parent) :
QMainWindow(parent),
@@ -67,7 +68,8 @@ AudioRecorder::AudioRecorder(QWidget *parent) :
audioRecorder = new QAudioRecorder(this);
probe = new QAudioProbe;
connect(probe, SIGNAL(audioBufferProbed(QAudioBuffer)), this, SLOT(processBuffer(QAudioBuffer)));
connect(probe, SIGNAL(audioBufferProbed(QAudioBuffer)),
this, SLOT(processBuffer(QAudioBuffer)));
probe->setSource(audioRecorder);
//audio devices
@@ -88,27 +90,34 @@ AudioRecorder::AudioRecorder(QWidget *parent) :
ui->containerBox->addItem(containerName, QVariant(containerName));
}
//sample rate:
//sample rate
ui->sampleRateBox->addItem(tr("Default"), QVariant(0));
foreach (int sampleRate, audioRecorder->supportedAudioSampleRates()) {
ui->sampleRateBox->addItem(QString::number(sampleRate), QVariant(
sampleRate));
}
//channels
ui->channelsBox->addItem(tr("Default"), QVariant(-1));
ui->channelsBox->addItem(QStringLiteral("1"), QVariant(1));
ui->channelsBox->addItem(QStringLiteral("2"), QVariant(2));
ui->channelsBox->addItem(QStringLiteral("4"), QVariant(4));
//quality
ui->qualitySlider->setRange(0, int(QMultimedia::VeryHighQuality));
ui->qualitySlider->setValue(int(QMultimedia::NormalQuality));
//bitrates:
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));
ui->bitrateBox->addItem(tr("Default"), QVariant(0));
ui->bitrateBox->addItem(QStringLiteral("32000"), QVariant(32000));
ui->bitrateBox->addItem(QStringLiteral("64000"), QVariant(64000));
ui->bitrateBox->addItem(QStringLiteral("96000"), QVariant(96000));
ui->bitrateBox->addItem(QStringLiteral("128000"), QVariant(128000));
connect(audioRecorder, SIGNAL(durationChanged(qint64)), this,
SLOT(updateProgress(qint64)));
connect(audioRecorder, SIGNAL(stateChanged(QMediaRecorder::State)), this,
SLOT(updateState(QMediaRecorder::State)));
connect(audioRecorder, SIGNAL(statusChanged(QMediaRecorder::Status)), this,
SLOT(updateStatus(QMediaRecorder::Status)));
connect(audioRecorder, SIGNAL(error(QMediaRecorder::Error)), this,
SLOT(displayErrorMessage()));
}
@@ -127,32 +136,47 @@ void AudioRecorder::updateProgress(qint64 duration)
ui->statusbar->showMessage(tr("Recorded %1 sec").arg(duration / 1000));
}
void AudioRecorder::updateState(QMediaRecorder::State state)
void AudioRecorder::updateStatus(QMediaRecorder::Status status)
{
QString statusMessage;
switch (state) {
case QMediaRecorder::RecordingState:
ui->recordButton->setText(tr("Stop"));
ui->pauseButton->setText(tr("Pause"));
if (audioRecorder->outputLocation().isEmpty())
statusMessage = tr("Recording");
else
statusMessage = tr("Recording to %1").arg(
switch (status) {
case QMediaRecorder::RecordingStatus:
if (audioLevels.count() != audioRecorder->audioSettings().channelCount()) {
qDeleteAll(audioLevels);
audioLevels.clear();
for (int i = 0; i < audioRecorder->audioSettings().channelCount(); ++i) {
QAudioLevel *level = new QAudioLevel(ui->centralwidget);
audioLevels.append(level);
ui->levelsLayout->addWidget(level);
}
}
ui->recordButton->setText(tr("Stop"));
ui->pauseButton->setText(tr("Pause"));
if (audioRecorder->outputLocation().isEmpty())
statusMessage = tr("Recording");
else
statusMessage = tr("Recording to %1").arg(
audioRecorder->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");
break;
case QMediaRecorder::PausedStatus:
clearAudioLevels();
ui->recordButton->setText(tr("Stop"));
ui->pauseButton->setText(tr("Resume"));
statusMessage = tr("Paused");
break;
case QMediaRecorder::UnloadedStatus:
clearAudioLevels();
ui->recordButton->setText(tr("Record"));
ui->pauseButton->setText(tr("Pause"));
statusMessage = tr("Stopped");
default:
break;
}
ui->pauseButton->setEnabled(state != QMediaRecorder::StoppedState);
ui->pauseButton->setEnabled(audioRecorder->state()
!= QMediaRecorder::StoppedState);
if (audioRecorder->error() == QMediaRecorder::NoError)
ui->statusbar->showMessage(statusMessage);
@@ -176,6 +200,7 @@ void AudioRecorder::toggleRecord()
settings.setCodec(boxValue(ui->audioCodecBox).toString());
settings.setSampleRate(boxValue(ui->sampleRateBox).toInt());
settings.setBitRate(boxValue(ui->bitrateBox).toInt());
settings.setChannelCount(boxValue(ui->channelsBox).toInt());
settings.setQuality(QMultimedia::EncodingQuality(ui->qualitySlider->value()));
settings.setEncodingMode(ui->constantQualityRadioButton->isChecked() ?
QMultimedia::ConstantQualityEncoding :
@@ -202,7 +227,7 @@ void AudioRecorder::togglePause()
void AudioRecorder::setOutputLocation()
{
QString fileName = QFileDialog::getSaveFileName();
audioRecorder->setOutputLocation(QUrl(fileName));
audioRecorder->setOutputLocation(QUrl::fromLocalFile(fileName));
outputLocationSet = true;
}
@@ -211,88 +236,121 @@ void AudioRecorder::displayErrorMessage()
ui->statusbar->showMessage(audioRecorder->errorString());
}
void AudioRecorder::clearAudioLevels()
{
for (int i = 0; i < audioLevels.size(); ++i)
audioLevels.at(i)->setLevel(0);
}
// This function returns the maximum possible sample value for a given audio format
qreal getPeakValue(const QAudioFormat& format)
{
// Note: Only the most common sample formats are supported
if (!format.isValid())
return 0.0;
return qreal(0);
if (format.codec() != "audio/pcm")
return 0.0;
return qreal(0);
switch (format.sampleType()) {
case QAudioFormat::Unknown:
break;
case QAudioFormat::Float:
if (format.sampleSize() != 32) // other sample formats are not supported
return 0.0;
return 1.00003;
return qreal(0);
return qreal(1.00003);
case QAudioFormat::SignedInt:
if (format.sampleSize() == 32)
return 2147483648.0;
return qreal(INT_MAX);
if (format.sampleSize() == 16)
return 32768.0;
return qreal(SHRT_MAX);
if (format.sampleSize() == 8)
return 128.0;
return qreal(CHAR_MAX);
break;
case QAudioFormat::UnSignedInt:
// Unsigned formats are not supported in this example
if (format.sampleSize() == 32)
return qreal(UINT_MAX);
if (format.sampleSize() == 16)
return qreal(USHRT_MAX);
if (format.sampleSize() == 8)
return qreal(UCHAR_MAX);
break;
}
return 0.0;
return qreal(0);
}
qreal getBufferLevel(const QAudioBuffer& buffer)
// returns the audio level for each channel
QVector<qreal> getBufferLevels(const QAudioBuffer& buffer)
{
QVector<qreal> values;
if (!buffer.format().isValid() || buffer.format().byteOrder() != QAudioFormat::LittleEndian)
return 0.0;
return values;
if (buffer.format().codec() != "audio/pcm")
return 0.0;
return values;
int channelCount = buffer.format().channelCount();
values.fill(0, channelCount);
qreal peak_value = getPeakValue(buffer.format());
if (qFuzzyCompare(peak_value, 0.0))
return 0.0;
if (qFuzzyCompare(peak_value, qreal(0)))
return values;
switch (buffer.format().sampleType()) {
case QAudioFormat::Unknown:
case QAudioFormat::UnSignedInt:
if (buffer.format().sampleSize() == 32)
values = getBufferLevels(buffer.constData<quint32>(), buffer.frameCount(), channelCount);
if (buffer.format().sampleSize() == 16)
values = getBufferLevels(buffer.constData<quint16>(), buffer.frameCount(), channelCount);
if (buffer.format().sampleSize() == 8)
values = getBufferLevels(buffer.constData<quint8>(), buffer.frameCount(), channelCount);
for (int i = 0; i < values.size(); ++i)
values[i] = qAbs(values.at(i) - peak_value / 2) / (peak_value / 2);
break;
case QAudioFormat::Float:
if (buffer.format().sampleSize() == 32)
return getBufferLevel(buffer.constData<float>(), buffer.sampleCount()) / peak_value;
if (buffer.format().sampleSize() == 32) {
values = getBufferLevels(buffer.constData<float>(), buffer.frameCount(), channelCount);
for (int i = 0; i < values.size(); ++i)
values[i] /= peak_value;
}
break;
case QAudioFormat::SignedInt:
if (buffer.format().sampleSize() == 32)
return getBufferLevel(buffer.constData<long int>(), buffer.sampleCount()) / peak_value;
values = getBufferLevels(buffer.constData<qint32>(), buffer.frameCount(), channelCount);
if (buffer.format().sampleSize() == 16)
return getBufferLevel(buffer.constData<short int>(), buffer.sampleCount()) / peak_value;
values = getBufferLevels(buffer.constData<qint16>(), buffer.frameCount(), channelCount);
if (buffer.format().sampleSize() == 8)
return getBufferLevel(buffer.constData<signed char>(), buffer.sampleCount()) / peak_value;
values = getBufferLevels(buffer.constData<qint8>(), buffer.frameCount(), channelCount);
for (int i = 0; i < values.size(); ++i)
values[i] /= peak_value;
break;
}
return 0.0;
return values;
}
template <class T>
qreal getBufferLevel(const T *buffer, int samples)
QVector<qreal> getBufferLevels(const T *buffer, int frames, int channels)
{
qreal max_value = 0.0;
QVector<qreal> max_values;
max_values.fill(0, channels);
for (int i = 0; i < samples; ++i) {
qreal value = qAbs(qreal(buffer[i]));
if (value > max_value)
max_value = value;
for (int i = 0; i < frames; ++i) {
for (int j = 0; j < channels; ++j) {
qreal value = qAbs(qreal(buffer[i * channels + j]));
if (value > max_values.at(j))
max_values.replace(j, value);
}
}
return max_value;
return max_values;
}
void AudioRecorder::processBuffer(const QAudioBuffer& buffer)
{
qreal level = getBufferLevel(buffer);
ui->audioLevel->setLevel(level);
QVector<qreal> levels = getBufferLevels(buffer);
for (int i = 0; i < levels.count(); ++i)
audioLevels.at(i)->setLevel(levels.at(i));
}

7
examples/multimedia/audiorecorder/audiorecorder.h
View File

@@ -52,6 +52,8 @@ class QAudioProbe;
class QAudioBuffer;
QT_END_NAMESPACE
class QAudioLevel;
class AudioRecorder : public QMainWindow
{
Q_OBJECT
@@ -68,15 +70,18 @@ private slots:
void togglePause();
void toggleRecord();
void updateState(QMediaRecorder::State);
void updateStatus(QMediaRecorder::Status);
void updateProgress(qint64 pos);
void displayErrorMessage();
private:
void clearAudioLevels();
Ui::AudioRecorder *ui;
QAudioRecorder *audioRecorder;
QAudioProbe *probe;
QList<QAudioLevel*> audioLevels;
bool outputLocationSet;
};

35
examples/multimedia/audiorecorder/audiorecorder.ui
View File

@@ -17,10 +17,10 @@
<layout class="QGridLayout" name="gridLayout_3">
<item row="0" column="0" colspan="3">
<layout class="QGridLayout" name="gridLayout_2">
<item row="0" column="0">
<widget class="QLabel" name="label">
<item row="3" column="0">
<widget class="QLabel" name="label_4">
<property name="text">
<string>Input Device:</string>
<string>Sample rate:</string>
</property>
</widget>
</item>
@@ -34,8 +34,12 @@
</property>
</widget>
</item>
<item row="1" column="1">
<widget class="QComboBox" name="audioCodecBox"/>
<item row="0" column="0">
<widget class="QLabel" name="label">
<property name="text">
<string>Input Device:</string>
</property>
</widget>
</item>
<item row="2" column="0">
<widget class="QLabel" name="label_3">
@@ -47,15 +51,21 @@
<item row="2" column="1">
<widget class="QComboBox" name="containerBox"/>
</item>
<item row="3" column="0">
<widget class="QLabel" name="label_4">
<item row="3" column="1">
<widget class="QComboBox" name="sampleRateBox"/>
</item>
<item row="1" column="1">
<widget class="QComboBox" name="audioCodecBox"/>
</item>
<item row="4" column="0">
<widget class="QLabel" name="label_5">
<property name="text">
<string>Sample rate:</string>
<string>Channels:</string>
</property>
</widget>
</item>
<item row="3" column="1">
<widget class="QComboBox" name="sampleRateBox"/>
<item row="4" column="1">
<widget class="QComboBox" name="channelsBox"/>
</item>
</layout>
</item>
@@ -162,9 +172,8 @@
</property>
</widget>
</item>
<item row="3" column="1" colspan="-1">
<widget class="QAudioLevel" name="audioLevel">
</widget>
<item row="3" column="1" colspan="2">
<layout class="QVBoxLayout" name="levelsLayout"/>
</item>
</layout>
</widget>

134
examples/multimedia/audiorecorder/audiorecorder_small.ui
View File

@@ -28,57 +28,33 @@
<rect>
<x>0</x>
<y>0</y>
<width>398</width>
<height>275</height>
<width>400</width>
<height>277</height>
</rect>
</property>
<layout class="QGridLayout" name="gridLayout_4">
<item row="0" column="0">
<widget class="QWidget" name="widget" native="true">
<layout class="QGridLayout" name="gridLayout_3">
<item row="0" column="0">
<layout class="QGridLayout" name="gridLayout_2">
<item row="0" column="0">
<widget class="QLabel" name="label">
<property name="text">
<string>Input Device:</string>
</property>
</widget>
</item>
<item row="0" column="1">
<widget class="QComboBox" name="audioDeviceBox"/>
</item>
<item row="1" column="0">
<widget class="QLabel" name="label_2">
<property name="text">
<string>Audio Codec:</string>
</property>
</widget>
</item>
<item row="1" column="1">
<widget class="QComboBox" name="audioCodecBox"/>
</item>
<item row="2" column="0">
<widget class="QLabel" name="label_3">
<property name="text">
<string>File Container:</string>
</property>
</widget>
</item>
<item row="2" column="1">
<widget class="QComboBox" name="containerBox"/>
</item>
<item row="3" column="0">
<widget class="QLabel" name="label_4">
<property name="text">
<string>Sample rate:</string>
</property>
</widget>
</item>
<item row="3" column="1">
<widget class="QComboBox" name="sampleRateBox"/>
</item>
</layout>
<item row="3" column="0">
<widget class="QLabel" name="label_6">
<property name="text">
<string>Audio Level:</string>
</property>
</widget>
</item>
<item row="2" column="0">
<spacer name="verticalSpacer">
<property name="orientation">
<enum>Qt::Vertical</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>20</width>
<height>29</height>
</size>
</property>
</spacer>
</item>
<item row="1" column="0">
<layout class="QGridLayout" name="gridLayout">
@@ -127,18 +103,62 @@
</item>
</layout>
</item>
<item row="2" column="0">
<spacer name="verticalSpacer">
<property name="orientation">
<enum>Qt::Vertical</enum>
</property>
<property name="sizeHint" stdset="0">
<size>
<width>20</width>
<height>29</height>
</size>
</property>
</spacer>
<item row="0" column="0">
<layout class="QGridLayout" name="gridLayout_2">
<item row="3" column="0">
<widget class="QLabel" name="label_4">
<property name="text">
<string>Sample rate:</string>
</property>
</widget>
</item>
<item row="1" column="0">
<widget class="QLabel" name="label_2">
<property name="text">
<string>Audio Codec:</string>
</property>
</widget>
</item>
<item row="2" column="1">
<widget class="QComboBox" name="containerBox"/>
</item>
<item row="0" column="1">
<widget class="QComboBox" name="audioDeviceBox"/>
</item>
<item row="3" column="1">
<widget class="QComboBox" name="sampleRateBox"/>
</item>
<item row="1" column="1">
<widget class="QComboBox" name="audioCodecBox"/>
</item>
<item row="2" column="0">
<widget class="QLabel" name="label_3">
<property name="text">
<string>File Container:</string>
</property>
</widget>
</item>
<item row="0" column="0">
<widget class="QLabel" name="label">
<property name="text">
<string>Input Device:</string>
</property>
</widget>
</item>
<item row="4" column="0">
<widget class="QLabel" name="label_5">
<property name="text">
<string>Channels:</string>
</property>
</widget>
</item>
<item row="4" column="1">
<widget class="QComboBox" name="channelsBox"/>
</item>
</layout>
</item>
<item row="4" column="0">
<layout class="QVBoxLayout" name="levelsLayout"/>
</item>
</layout>
</widget>

2
examples/multimedia/audiorecorder/qaudiolevel.cpp
View File

@@ -45,6 +45,8 @@ QAudioLevel::QAudioLevel(QWidget *parent)
: QWidget(parent)
, m_level(0.0)
{
setMinimumHeight(15);
setMaximumHeight(50);
}
void QAudioLevel::setLevel(qreal level)