tone/
tone.rs

1// Copyright © 2011 Mozilla Foundation
2//
3// This program is made available under an ISC-style license.  See the
4// accompanying file LICENSE for details.
5
6//! libcubeb api/function test. Plays a simple tone.
7extern crate cubeb;
8
9mod common;
10
11use cubeb::{MonoFrame, Sample};
12use std::f32::consts::PI;
13use std::thread;
14use std::time::Duration;
15
16const SAMPLE_FREQUENCY: u32 = 48_000;
17const STREAM_FORMAT: cubeb::SampleFormat = cubeb::SampleFormat::S16LE;
18
19type Frame = MonoFrame<i16>;
20
21fn main() {
22    let ctx = common::init("Cubeb tone example").expect("Failed to create cubeb context");
23
24    let params = cubeb::StreamParamsBuilder::new()
25        .format(STREAM_FORMAT)
26        .rate(SAMPLE_FREQUENCY)
27        .channels(1)
28        .layout(cubeb::ChannelLayout::MONO)
29        .take();
30
31    let mut position = 0u32;
32
33    let mut builder = cubeb::StreamBuilder::<Frame>::new();
34    builder
35        .name("Cubeb tone (mono)")
36        .default_output(&params)
37        .latency(0x1000)
38        .data_callback(move |_, output| {
39            // generate our test tone on the fly
40            for f in output.iter_mut() {
41                // North American dial tone
42                let t1 = (2.0 * PI * 350.0 * position as f32 / SAMPLE_FREQUENCY as f32).sin();
43                let t2 = (2.0 * PI * 440.0 * position as f32 / SAMPLE_FREQUENCY as f32).sin();
44
45                f.m = i16::from_float(0.5 * (t1 + t2));
46
47                position += 1;
48            }
49            output.len() as isize
50        })
51        .state_callback(|state| {
52            println!("stream {:?}", state);
53        });
54
55    let stream = builder.init(&ctx).expect("Failed to create cubeb stream");
56
57    stream.start().unwrap();
58    thread::sleep(Duration::from_millis(500));
59    stream.stop().unwrap();
60}
tone/tone.rs

tone/
tone.rs
