/
playsine_events.rs
128 lines (108 loc) · 3.71 KB
/
playsine_events.rs
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use std::f64::consts::PI;
use std::rc::Rc;
use wasapi::*;
#[macro_use]
extern crate log;
use simplelog::*;
struct SineGenerator {
time: f64,
freq: f64,
delta_t: f64,
amplitude: f64,
}
impl SineGenerator {
fn new(freq: f64, fs: f64, amplitude: f64) -> Self {
SineGenerator {
time: 0.0,
freq,
delta_t: 1.0 / fs,
amplitude,
}
}
}
impl Iterator for SineGenerator {
type Item = f32;
fn next(&mut self) -> Option<f32> {
self.time += self.delta_t;
let output = ((self.freq * self.time * PI * 2.).sin() * self.amplitude) as f32;
Some(output)
}
}
// Main loop
fn main() {
let _ = SimpleLogger::init(
LevelFilter::Debug,
ConfigBuilder::new()
.set_time_format_rfc3339()
.set_time_offset_to_local()
.unwrap()
.build(),
);
initialize_mta().unwrap();
let mut gen = SineGenerator::new(1000.0, 44100.0, 0.1);
let channels = 2;
let device = get_default_device(&Direction::Render).unwrap();
let mut audio_client = device.get_iaudioclient().unwrap();
let desired_format = WaveFormat::new(32, 32, &SampleType::Float, 44100, channels, None);
// Blockalign is the number of bytes per frame
let blockalign = desired_format.get_blockalign();
debug!("Desired playback format: {:?}", desired_format);
let (def_time, min_time) = audio_client.get_periods().unwrap();
debug!("default period {}, min period {}", def_time, min_time);
audio_client
.initialize_client(
&desired_format,
def_time,
&Direction::Render,
&ShareMode::Shared,
true,
)
.unwrap();
debug!("initialized playback");
let h_event = audio_client.set_get_eventhandle().unwrap();
let render_client = audio_client.get_audiorenderclient().unwrap();
let mut callbacks = EventCallbacks::new();
callbacks.set_simple_volume_callback(move |vol, mute, _guid| {
println!("New simple volume {}, mute {}", vol, mute);
});
callbacks.set_state_callback(|state| println!("New state: {:?}", state));
callbacks.set_channel_volume_callback(|index, vol, _guid| {
println!("New channel volume {}, channel {}", vol, index)
});
callbacks.set_disconnected_callback(|reason| println!("Disconnected, reason: {:?}", reason));
let callbacks_rc = Rc::new(callbacks);
let callbacks_weak = Rc::downgrade(&callbacks_rc);
let sessioncontrol = audio_client.get_audiosessioncontrol().unwrap();
sessioncontrol
.register_session_notification(callbacks_weak)
.unwrap();
audio_client.start_stream().unwrap();
loop {
let buffer_frame_count = audio_client.get_available_space_in_frames().unwrap();
let mut data = vec![0u8; buffer_frame_count as usize * blockalign as usize];
for frame in data.chunks_exact_mut(blockalign as usize) {
let sample = gen.next().unwrap();
let sample_bytes = sample.to_le_bytes();
for value in frame.chunks_exact_mut(blockalign as usize / channels) {
for (bufbyte, sinebyte) in value.iter_mut().zip(sample_bytes.iter()) {
*bufbyte = *sinebyte;
}
}
}
trace!("write");
render_client
.write_to_device(
buffer_frame_count as usize,
blockalign as usize,
&data,
None,
)
.unwrap();
trace!("write ok");
if h_event.wait_for_event(1000).is_err() {
error!("error, stopping playback");
audio_client.stop_stream().unwrap();
break;
}
}
}