SPU: Emulate SOUNDBIAS and 10-bit degrade

src/frontend/qt_sdl/AudioSettingsDialog.cpp

@@ -39,6 +39,7 @@ AudioSettingsDialog::AudioSettingsDialog(QWidget* parent) : QDialog(parent), ui(
     setAttribute(Qt::WA_DeleteOnClose);
 
     oldInterp = Config::AudioInterp;
+    oldBitrate = Config::AudioBitrate;
     oldVolume = Config::AudioVolume;
 
     ui->cbInterpolation->addItem("None");
@@ -47,6 +48,11 @@ AudioSettingsDialog::AudioSettingsDialog(QWidget* parent) : QDialog(parent), ui(
     ui->cbInterpolation->addItem("Cubic");
     ui->cbInterpolation->setCurrentIndex(Config::AudioInterp);
 
+    ui->cbBitrate->addItem("Automatic");
+    ui->cbBitrate->addItem("10-bit");
+    ui->cbBitrate->addItem("16-bit");
+    ui->cbBitrate->setCurrentIndex(Config::AudioBitrate);
+
     ui->slVolume->setValue(Config::AudioVolume);
 
     grpMicMode = new QButtonGroup(this);
@@ -81,11 +87,22 @@ void AudioSettingsDialog::on_AudioSettingsDialog_accepted()
 void AudioSettingsDialog::on_AudioSettingsDialog_rejected()
 {
     Config::AudioInterp = oldInterp;
+    Config::AudioBitrate = oldBitrate;
     Config::AudioVolume = oldVolume;
 
     closeDlg();
 }
 
+void AudioSettingsDialog::on_cbBitrate_currentIndexChanged(int idx)
+{
+    // prevent a spurious change
+    if (ui->cbBitrate->count() < 3) return;
+
+    Config::AudioBitrate = ui->cbBitrate->currentIndex();
+
+    emit updateAudioSettings();
+}
+
 void AudioSettingsDialog::on_cbInterpolation_currentIndexChanged(int idx)
 {
     // prevent a spurious change

src/frontend/qt_sdl/AudioSettingsDialog.h

@@ -59,6 +59,7 @@ private slots:
     void on_AudioSettingsDialog_rejected();
 
     void on_cbInterpolation_currentIndexChanged(int idx);
+    void on_cbBitrate_currentIndexChanged(int idx);
     void on_slVolume_valueChanged(int val);
     void onChangeMicMode(int mode);
     void on_btnMicWavBrowse_clicked();
@@ -67,6 +68,7 @@ private:
     Ui::AudioSettingsDialog* ui;
 
     int oldInterp;
+    int oldBitrate;
     int oldVolume;
     QButtonGroup* grpMicMode;
 };

src/frontend/qt_sdl/AudioSettingsDialog.ui

@@ -29,14 +29,14 @@
       <string>Audio output</string>
      </property>
      <layout class="QGridLayout" name="gridLayout_2">
-      <item row="1" column="0">
+      <item row="2" column="0">
        <widget class="QLabel" name="label">
         <property name="text">
          <string>Volume:</string>
         </property>
        </widget>
       </item>
-      <item row="1" column="1">
+      <item row="2" column="1">
        <widget class="QSlider" name="slVolume">
         <property name="whatsThis">
          <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Controls the volume of the audio output.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
@@ -66,6 +66,20 @@
         </property>
        </widget>
       </item>
+      <item row="1" column="0">
+       <widget class="QLabel" name="label_3">
+        <property name="text">
+         <string>Bitrate:</string>
+        </property>
+       </widget>
+      </item>
+      <item row="1" column="1">
+       <widget class="QComboBox" name="cbBitrate">
+        <property name="whatsThis">
+			<string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;The bitrate of audio playback. If set to &quot;Automatic&quot; this will be 10-bit for DS mode and 16-bit for DSi mode.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+        </property>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>

src/frontend/qt_sdl/main.cpp

@@ -2436,6 +2436,11 @@ void MainWindow::onOpenAudioSettings()
 void MainWindow::onUpdateAudioSettings()
 {
     SPU::SetInterpolation(Config::AudioInterp);
+
+    if (Config::AudioBitrate == 0)
+        SPU::SetDegrade10Bit(NDS::ConsoleType == 0);
+    else
+        SPU::SetDegrade10Bit(Config::AudioBitrate == 1);
 }
 
 void MainWindow::onAudioSettingsFinished(int res)