fix stack overflows in audio code by moving huge structs to heap

src/sound/mod.rs

@@ -445,10 +445,10 @@ where
     let mut state = PlaybackState::Stopped;
     let mut saved_state: PlaybackStateType = PlaybackStateType::None;
     let mut speed = 1.0;
-    let mut org_engine = OrgPlaybackEngine::new();
+    let mut org_engine = Box::new(OrgPlaybackEngine::new());
     #[cfg(feature = "ogg-playback")]
-    let mut ogg_engine = OggPlaybackEngine::new();
-    let mut pixtone = PixTonePlayback::new();
+    let mut ogg_engine = Box::new(OggPlaybackEngine::new());
+    let mut pixtone = Box::new(PixTonePlayback::new());
     pixtone.create_samples();
 
     log::info!("Audio format: {} {}", sample_rate, channels);

src/sound/pixtone.rs

@@ -32,10 +32,10 @@ lazy_static! {
 
 #[derive(Copy, Clone)]
 pub struct Waveform {
-    pub waveform_type: u8,
     pub pitch: f32,
     pub level: i32,
     pub offset: i32,
+    pub waveform_type: u8,
 }
 
 impl Waveform {
@@ -96,12 +96,12 @@ impl Envelope {
 
 #[derive(Copy, Clone)]
 pub struct Channel {
-    pub enabled: bool,
-    pub length: u32,
     pub carrier: Waveform,
     pub frequency: Waveform,
     pub amplitude: Waveform,
     pub envelope: Envelope,
+    pub length: u32,
+    pub enabled: bool,
 }
 
 impl Channel {
@@ -179,9 +179,9 @@ impl PixToneParameters {
 #[derive(Copy, Clone, PartialEq)]
 pub struct PlaybackState {
     id: u8,
+    looping: bool,
     pos: f32,
     tag: u32,
-    looping: bool,
     freq: f32,
 }