configure_audio: User-configuratble option to enable/disable audio stretching

src/citra/config.cpp

@@ -78,6 +78,7 @@ void Config::ReadValues() {
 
     // Audio
     Settings::values.sink_id = sdl2_config->Get("Audio", "output_engine", "auto");
+    Settings::values.enable_audio_stretching = sdl2_config->GetBoolean("Audio", "enable_audio_stretching", true);
 
     // Data Storage
     Settings::values.use_virtual_sd = sdl2_config->GetBoolean("Data Storage", "use_virtual_sd", true);

src/citra/default_ini.h

@@ -66,6 +66,12 @@ bg_green =
 # auto (default): Auto-select, null: No audio output, sdl2: SDL2 (if available)
 output_engine =
 
+# Whether or not to enable the audio-stretching post-processing effect.
+# This effect adjusts audio speed to match emulation speed and helps prevent audio stutter,
+# at the cost of increasing audio latency.
+# 0: No, 1 (default): Yes
+enable_audio_stretching =
+
 [Data Storage]
 # Whether to create a virtual SD card.
 # 1 (default): Yes, 0: No

src/citra_qt/config.cpp

@@ -56,6 +56,7 @@ void Config::ReadValues() {
 
     qt_config->beginGroup("Audio");
     Settings::values.sink_id = qt_config->value("output_engine", "auto").toString().toStdString();
+    Settings::values.enable_audio_stretching = qt_config->value("enable_audio_stretching", true).toBool();
     qt_config->endGroup();
 
     qt_config->beginGroup("Data Storage");
@@ -148,6 +149,7 @@ void Config::SaveValues() {
 
     qt_config->beginGroup("Audio");
     qt_config->setValue("output_engine", QString::fromStdString(Settings::values.sink_id));
+    qt_config->setValue("enable_audio_stretching", Settings::values.enable_audio_stretching);
     qt_config->endGroup();
 
     qt_config->beginGroup("Data Storage");

src/citra_qt/configure_audio.cpp

@@ -36,9 +36,12 @@ void ConfigureAudio::setConfiguration() {
         }
     }
     ui->output_sink_combo_box->setCurrentIndex(new_sink_index);
+
+    ui->toggle_audio_stretching->setChecked(Settings::values.enable_audio_stretching);
 }
 
 void ConfigureAudio::applyConfiguration() {
     Settings::values.sink_id = ui->output_sink_combo_box->itemText(ui->output_sink_combo_box->currentIndex()).toStdString();
+    Settings::values.enable_audio_stretching = ui->toggle_audio_stretching->isChecked();
     Settings::Apply();
 }

src/citra_qt/configure_audio.ui

@@ -25,6 +25,16 @@
         </item>
        </layout>
       </item>
+      <item>
+       <widget class="QCheckBox" name="toggle_audio_stretching">
+        <property name="text">
+         <string>Enable audio stretching</string>
+        </property>
+        <property name="toolTip">
+         <string>This post-processing effect adjusts audio speed to match emulation speed and helps prevent audio stutter. This however increases audio latency.</string>
+        </property>
+       </widget>
+      </item>
      </layout>
     </widget>
    </item>

src/core/settings.cpp

@@ -24,6 +24,7 @@ void Apply() {
     VideoCore::g_scaled_resolution_enabled = values.use_scaled_resolution;
 
     AudioCore::SelectSink(values.sink_id);
+    AudioCore::EnableStretching(values.enable_audio_stretching);
 
 }
 

src/core/settings.h

@@ -81,6 +81,7 @@ struct Values {
 
     // Audio
     std::string sink_id;
+    bool enable_audio_stretching;
 
     // Debugging
     bool use_gdbstub;