Add a dithering option to alsoft-config

2 files changed, 37 insertions, 0 deletions

diff --git a/utils/alsoft-config/mainwindow.cpp b/utils/alsoft-config/mainwindow.cpp
index 4f16726f..a743ca6a 100644
--- a/utils/alsoft-config/mainwindow.cpp
+++ b/utils/alsoft-config/mainwindow.cpp
@@ -329,6 +329,7 @@ MainWindow::MainWindow(QWidget *parent) :
     connect(ui->stereoEncodingComboBox, SIGNAL(currentIndexChanged(QString)), this, SLOT(enableApplyButton()));
     connect(ui->ambiFormatComboBox, SIGNAL(currentIndexChanged(QString)), this, SLOT(enableApplyButton()));
     connect(ui->outputLimiterCheckBox, SIGNAL(stateChanged(int)), this, SLOT(enableApplyButton()));
+    connect(ui->outputDitherCheckBox, SIGNAL(stateChanged(int)), this, SLOT(enableApplyButton()));
 
     connect(ui->decoderHQModeCheckBox, SIGNAL(stateChanged(int)), this, SLOT(enableApplyButton()));
     connect(ui->decoderDistCompCheckBox, SIGNAL(stateChanged(int)), this, SLOT(enableApplyButton()));
@@ -654,6 +655,13 @@ void MainWindow::loadConfig(const QString &fname)
             settings.value("output-limiter").toBool() ? Qt::Checked : Qt::Unchecked
         );
 
+    if(settings.value("dither").isNull())
+        ui->outputDitherCheckBox->setCheckState(Qt::PartiallyChecked);
+    else
+        ui->outputDitherCheckBox->setCheckState(
+            settings.value("dither").toBool() ? Qt::Checked : Qt::Unchecked
+        );
+
     QString stereopan = settings.value("stereo-encoding").toString();
     ui->stereoEncodingComboBox->setCurrentIndex(0);
     if(stereopan.isEmpty() == false)
@@ -917,6 +925,14 @@ void MainWindow::saveConfig(const QString &fname) const
     else if(limiter == Qt::Unchecked)
         settings.setValue("output-limiter", QString("false"));
 
+    Qt::CheckState dither = ui->outputDitherCheckBox->checkState();
+    if(dither == Qt::PartiallyChecked)
+        settings.setValue("dither", QString());
+    else if(dither == Qt::Checked)
+        settings.setValue("dither", QString("true"));
+    else if(dither == Qt::Unchecked)
+        settings.setValue("dither", QString("false"));
+
     settings.setValue("decoder/hq-mode",
         ui->decoderHQModeCheckBox->isChecked() ? QString("true") : QString(/*"false"*/)
     );
diff --git a/utils/alsoft-config/mainwindow.ui b/utils/alsoft-config/mainwindow.ui
index 153bcc04..23d7573a 100644
--- a/utils/alsoft-config/mainwindow.ui
+++ b/utils/alsoft-config/mainwindow.ui
@@ -504,6 +504,27 @@ avoiding excessive clipping noise.</string>
         <bool>true</bool>
        </property>
       </widget>
+      <widget class="QCheckBox" name="outputDitherCheckBox">
+       <property name="geometry">
+        <rect>
+         <x>270</x>
+         <y>160</y>
+         <width>261</width>
+         <height>21</height>
+        </rect>
+       </property>
+       <property name="toolTip">
+        <string>Applies dithering on the final mix for 8- and 16-bit output.
+This replaces the distortion created by nearest-value
+quantization with low-level whitenoise.</string>
+       </property>
+       <property name="text">
+        <string>Enable Dithering</string>
+       </property>
+       <property name="tristate">
+        <bool>true</bool>
+       </property>
+      </widget>
      </widget>
      <widget class="QGroupBox" name="groupBox_4">
       <property name="geometry">