Add a fast-forward command

src/emulator.rs

@@ -311,6 +311,10 @@ impl Emulator {
         }
     }
 
+    fn set_speed(&mut self, speed: f64) -> Result<()> {
+        self.audio.set_speed(speed)
+    }
+
     fn save_sram(&mut self, sim_id: SimId) -> Result<()> {
         let sim = self.sims.get_mut(sim_id.to_index());
         let cart = self.carts[sim_id.to_index()].as_mut();
@@ -567,6 +571,11 @@ impl Emulator {
             EmulatorCommand::FrameAdvance => {
                 self.frame_advance();
             }
+            EmulatorCommand::SetSpeed(speed) => {
+                if let Err(error) = self.set_speed(speed) {
+                    self.report_error(SimId::Player1, format!("Error setting speed: {error}"));
+                }
+            }
             EmulatorCommand::StartDebugging(sim_id, debugger) => {
                 self.start_debugging(sim_id, debugger);
             }
@@ -694,6 +703,7 @@ pub enum EmulatorCommand {
     Pause,
     Resume,
     FrameAdvance,
+    SetSpeed(f64),
     StartDebugging(SimId, DebugSender),
     StopDebugging(SimId),
     DebugInterrupt(SimId),