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authorGareth Stockwell <ext-gareth.stockwell@nokia.com>2010-10-26 14:15:14 (GMT)
committerGareth Stockwell <ext-gareth.stockwell@nokia.com>2010-10-29 12:46:33 (GMT)
commita53df3596e2061c202845f9f1c183177ca8a7eda (patch)
tree3fa4d53240388348a1fdfae16791fee8aa222e16 /demos
parentdd5ec222ce0285bd9419c9a47a8329bda41b5dd8 (diff)
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Do not unnecessarily reset state of spectrum demo
This patch ensures that the state of the application is not reset when: - Any of the 'Play generated tone', 'Play file' or settings dialogs are opened - Any of the 'Play generated tone', 'Play file' or settings dialogs are dismissed by pressing the Cancel button - A new input or output device is selected via the settings dialog, and that new device supports the data format which is currently being used within the application - The window function is changed via the settings dialog Note that the application is still reset if a new input or output device is selected via the settings dialog, and this device does not support the current data format. Task-number: QTBUG-12935 Task-number: QTBUG-14810
Diffstat (limited to 'demos')
-rw-r--r--demos/spectrum/app/engine.cpp84
-rw-r--r--demos/spectrum/app/mainwidget.cpp21
-rw-r--r--demos/spectrum/app/mainwidget.h1
3 files changed, 61 insertions, 45 deletions
diff --git a/demos/spectrum/app/engine.cpp b/demos/spectrum/app/engine.cpp
index 119a0e3..0495fe3 100644
--- a/demos/spectrum/app/engine.cpp
+++ b/demos/spectrum/app/engine.cpp
@@ -453,44 +453,50 @@ bool Engine::initialize()
{
bool result = false;
- reset();
+ QAudioFormat format = m_format;
if (selectFormat()) {
- const qint64 bufferLength = audioLength(m_format, BufferDurationUs);
- m_buffer.resize(bufferLength);
- m_buffer.fill(0);
- emit bufferDurationChanged(BufferDurationUs);
-
- if (m_generateTone) {
- if (0 == m_tone.endFreq) {
- const qreal nyquist = nyquistFrequency(m_format);
- m_tone.endFreq = qMin(qreal(SpectrumHighFreq), nyquist);
- }
+ if (m_format != format) {
+ format = m_format;
+ reset();
+ m_format = format;
+
+ const qint64 bufferLength = audioLength(m_format, BufferDurationUs);
+ m_buffer.resize(bufferLength);
+ m_buffer.fill(0);
+ emit bufferDurationChanged(BufferDurationUs);
+
+ if (m_generateTone) {
+ if (0 == m_tone.endFreq) {
+ const qreal nyquist = nyquistFrequency(m_format);
+ m_tone.endFreq = qMin(qreal(SpectrumHighFreq), nyquist);
+ }
- // Call function defined in utils.h, at global scope
- ::generateTone(m_tone, m_format, m_buffer);
- m_dataLength = m_buffer.size();
- emit dataDurationChanged(bufferDuration());
- setRecordPosition(bufferDuration());
- result = true;
- } else if (m_file) {
- const qint64 length = m_wavFile.readData(*m_file, m_buffer, m_format);
- if (length) {
- m_dataLength = length;
- emit dataDurationChanged(dataDuration());
- setRecordPosition(dataDuration());
+ // Call function defined in utils.h, at global scope
+ ::generateTone(m_tone, m_format, m_buffer);
+ m_dataLength = m_buffer.size();
+ emit dataDurationChanged(bufferDuration());
+ setRecordPosition(bufferDuration());
+ result = true;
+ } else if (m_file) {
+ const qint64 length = m_wavFile.readData(*m_file, m_buffer, m_format);
+ if (length) {
+ m_dataLength = length;
+ emit dataDurationChanged(dataDuration());
+ setRecordPosition(dataDuration());
+ result = true;
+ }
+ } else {
+ m_audioInput = new QAudioInput(m_audioInputDevice, m_format, this);
+ m_audioInput->setNotifyInterval(NotifyIntervalMs);
result = true;
}
- } else {
- m_audioInput = new QAudioInput(m_audioInputDevice, m_format, this);
- m_audioInput->setNotifyInterval(NotifyIntervalMs);
- result = true;
- }
- m_audioOutput = new QAudioOutput(m_audioOutputDevice, m_format, this);
- m_audioOutput->setNotifyInterval(NotifyIntervalMs);
- m_spectrumLengthBytes = SpectrumLengthSamples *
- (m_format.sampleSize() / 8) * m_format.channels();
+ m_audioOutput = new QAudioOutput(m_audioOutputDevice, m_format, this);
+ m_audioOutput->setNotifyInterval(NotifyIntervalMs);
+ m_spectrumLengthBytes = SpectrumLengthSamples *
+ (m_format.sampleSize() / 8) * m_format.channels();
+ }
} else {
if (m_file)
emit errorMessage(tr("Audio format not supported"),
@@ -510,12 +516,14 @@ bool Engine::selectFormat()
{
bool foundSupportedFormat = false;
- if (m_file) {
- // Header is read from the WAV file; just need to check whether
- // it is supported by the audio output device
- QAudioFormat format = m_wavFile.format();
- if (m_audioOutputDevice.isFormatSupported(m_wavFile.format())) {
- setFormat(m_wavFile.format());
+ if (m_file || QAudioFormat() != m_format) {
+ QAudioFormat format = m_format;
+ if (m_file)
+ // Header is read from the WAV file; just need to check whether
+ // it is supported by the audio output device
+ format = m_wavFile.format();
+ if (m_audioOutputDevice.isFormatSupported(format)) {
+ setFormat(format);
foundSupportedFormat = true;
} else {
// Try flipping mono <-> stereo
diff --git a/demos/spectrum/app/mainwidget.cpp b/demos/spectrum/app/mainwidget.cpp
index dd51a91..fba28c6 100644
--- a/demos/spectrum/app/mainwidget.cpp
+++ b/demos/spectrum/app/mainwidget.cpp
@@ -200,19 +200,20 @@ void MainWidget::dataDurationChanged(qint64 duration)
void MainWidget::showFileDialog()
{
- reset();
const QString dir;
const QStringList fileNames = QFileDialog::getOpenFileNames(this, tr("Open WAV file"), dir, "*.wav");
if (fileNames.count()) {
+ reset();
setMode(LoadFileMode);
m_engine->loadFile(fileNames.front());
updateButtonStates();
+ } else {
+ updateModeMenu();
}
}
void MainWidget::showSettingsDialog()
{
- reset();
m_settingsDialog->exec();
if (m_settingsDialog->result() == QDialog::Accepted) {
m_engine->setAudioInputDevice(m_settingsDialog->inputDevice());
@@ -223,9 +224,9 @@ void MainWidget::showSettingsDialog()
void MainWidget::showToneGeneratorDialog()
{
- reset();
m_toneGeneratorDialog->exec();
if (m_toneGeneratorDialog->result() == QDialog::Accepted) {
+ reset();
setMode(GenerateToneMode);
const qreal amplitude = m_toneGeneratorDialog->amplitude();
if (m_toneGeneratorDialog->isFrequencySweepEnabled()) {
@@ -236,6 +237,8 @@ void MainWidget::showToneGeneratorDialog()
m_engine->generateTone(tone);
updateButtonStates();
}
+ } else {
+ updateModeMenu();
}
}
@@ -445,10 +448,14 @@ void MainWidget::reset()
void MainWidget::setMode(Mode mode)
{
-
m_mode = mode;
- m_loadFileAction->setChecked(LoadFileMode == mode);
- m_generateToneAction->setChecked(GenerateToneMode == mode);
- m_recordAction->setChecked(RecordMode == mode);
+ updateModeMenu();
+}
+
+void MainWidget::updateModeMenu()
+{
+ m_loadFileAction->setChecked(LoadFileMode == m_mode);
+ m_generateToneAction->setChecked(GenerateToneMode == m_mode);
+ m_recordAction->setChecked(RecordMode == m_mode);
}
diff --git a/demos/spectrum/app/mainwidget.h b/demos/spectrum/app/mainwidget.h
index ddab8b7..cc1f9ed 100644
--- a/demos/spectrum/app/mainwidget.h
+++ b/demos/spectrum/app/mainwidget.h
@@ -89,6 +89,7 @@ private slots:
void showToneGeneratorDialog();
void initializeRecord();
void dataDurationChanged(qint64 duration);
+ void updateModeMenu();
private:
void createUi();