Start Sdl2AudioPlayer

Former-commit-id: 905b846d751db577bc213f1ca38a4c0e72558cfa

src/lib.rs

@@ -34,7 +34,7 @@ pub trait VideoInterface {
 }
 
 pub trait AudioInterface {
-    fn get_sample_rate(&self);
+    fn get_sample_rate(&self) -> u32;
 }
 
 pub trait InputInterface {

src/plat/sdl2/audio.rs

@@ -1 +1,51 @@
-const SAMPLE_RATE: u32 = 44100;
+use sdl2;
+use sdl2::audio::{AudioDevice, AudioSpec, AudioSpecDesired};
+
+use rustboyadvance_ng::AudioInterface;
+
+pub struct Sdl2AudioPlayer {
+    device: AudioDevice<GbaAudioCallback>,
+    freq: u32,
+}
+
+impl AudioInterface for Sdl2AudioPlayer {
+    fn get_sample_rate(&self) -> u32 {
+        self.freq
+    }
+}
+
+struct GbaAudioCallback {
+    spec: AudioSpec,
+}
+
+impl sdl2::audio::AudioCallback for GbaAudioCallback {
+    type Channel = f32;
+
+    fn callback(&mut self, out: &mut [f32]) {
+        // TODO audio
+        for x in out.iter_mut() {
+            *x = 0.0;
+        }
+    }
+}
+
+pub fn create_audio_player(sdl: &sdl2::Sdl) -> Sdl2AudioPlayer {
+    let audio_subsystem = sdl.audio().unwrap();
+
+    let desired_spec = AudioSpecDesired {
+        freq: Some(44100),
+        channels: Some(1), // stereo
+        samples: None,
+    };
+
+    let mut device = audio_subsystem
+        .open_playback(None, &desired_spec, |spec| {
+            println!("Obtained {:?}", spec);
+
+            GbaAudioCallback { spec: spec }
+        })
+        .unwrap();
+
+    let freq = (*device.lock()).spec.freq as u32;
+    Sdl2AudioPlayer { device, freq }
+}

src/plat/sdl2/keyboard.rs

@@ -7,12 +7,12 @@ use rustboyadvance_ng::InputInterface;
 extern crate bit;
 use bit::BitIndex;
 
-pub struct PlatformSdl2_Keyboard {
+pub struct Sdl2Keyboard {
     event_pump: EventPump,
     keyinput: u16,
 }
 
-impl InputInterface for PlatformSdl2_Keyboard {
+impl InputInterface for Sdl2Keyboard {
     fn poll(&mut self) -> u16 {
         for event in self.event_pump.poll_iter() {
             match event {
@@ -56,8 +56,8 @@ fn keycode_to_keypad(keycode: Keycode) -> Option<gba_keypad::Keys> {
     }
 }
 
-pub fn create_keyboard(sdl: &sdl2::Sdl) -> PlatformSdl2_Keyboard {
-    PlatformSdl2_Keyboard {
+pub fn create_keyboard(sdl: &sdl2::Sdl) -> Sdl2Keyboard {
+    Sdl2Keyboard {
         event_pump: sdl.event_pump().unwrap(),
         keyinput: gba_keypad::KEYINPUT_ALL_RELEASED,
     }

src/plat/sdl2/main.rs

@@ -11,8 +11,9 @@ mod audio;
 mod keyboard;
 mod video;
 
-use keyboard::{create_keyboard, PlatformSdl2_Keyboard};
-use video::{create_video_interface, PlatformSdl2_VideoInterface};
+use keyboard::create_keyboard;
+use video::create_video_interface;
+use audio::create_audio_player;
 
 #[macro_use]
 extern crate rustboyadvance_ng;
@@ -41,6 +42,7 @@ fn main() {
 
     let sdl_context = sdl2::init().unwrap();
     let mut video = create_video_interface(&sdl_context);
+    let mut audio = create_audio_player(&sdl_context);
     let mut keyboard = create_keyboard(&sdl_context);
 
     let mut fps_counter = FpsCounter::default();

src/plat/sdl2/video.rs

@@ -12,19 +12,19 @@ const SCREEN_WIDTH: u32 = DISPLAY_WIDTH as u32;
 const SCREEN_HEIGHT: u32 = DISPLAY_HEIGHT as u32;
 const SCALE: u32 = 3; // TODO control via CLI & support window resize
 
-pub struct PlatformSdl2_VideoInterface {
+pub struct Sdl2VideoInterface {
     tc: TextureCreator<WindowContext>,
     canvas: WindowCanvas,
     fps_counter: FpsCounter,
 }
 
-impl PlatformSdl2_VideoInterface {
+impl Sdl2VideoInterface {
     pub fn set_window_title(&mut self, title: &str) {
         self.canvas.window_mut().set_title(&title);
     }
 }
 
-impl VideoInterface for PlatformSdl2_VideoInterface {
+impl VideoInterface for Sdl2VideoInterface {
     fn render(&mut self, buffer: &[u32]) {
         let mut texture = self
             .tc
@@ -53,7 +53,7 @@ impl VideoInterface for PlatformSdl2_VideoInterface {
     }
 }
 
-pub fn create_video_interface(sdl: &Sdl) -> PlatformSdl2_VideoInterface {
+pub fn create_video_interface(sdl: &Sdl) -> Sdl2VideoInterface {
     let video_subsystem = sdl.video().unwrap();
     let window = video_subsystem
         .window(
@@ -69,7 +69,7 @@ pub fn create_video_interface(sdl: &Sdl) -> PlatformSdl2_VideoInterface {
     canvas.set_draw_color(Color::RGB(0, 0, 0));
     canvas.clear();
     let tc = canvas.texture_creator();
-    PlatformSdl2_VideoInterface {
+    Sdl2VideoInterface {
         tc: tc,
         canvas: canvas,
         fps_counter: Default::default(),