96 lines
4.0 KiB
Rust
96 lines
4.0 KiB
Rust
//! Records a WAV file (roughly 3 seconds long) using the default input device and format.
|
|
//!
|
|
//! The input data is recorded to "$CARGO_MANIFEST_DIR/recorded.wav".
|
|
|
|
extern crate cpal;
|
|
extern crate hound;
|
|
|
|
fn main() {
|
|
// Setup the default input device and stream with the default input format.
|
|
let device = cpal::default_input_device().expect("Failed to get default input device");
|
|
println!("Default input device: {}", device.name());
|
|
let format = device.default_input_format().expect("Failed to get default input format");
|
|
println!("Default input format: {:?}", format);
|
|
let event_loop = cpal::EventLoop::new();
|
|
let stream_id = event_loop.build_input_stream(&device, &format)
|
|
.expect("Failed to build input stream");
|
|
event_loop.play_stream(stream_id);
|
|
|
|
// The WAV file we're recording to.
|
|
const PATH: &'static str = concat!(env!("CARGO_MANIFEST_DIR"), "/recorded.wav");
|
|
let spec = wav_spec_from_format(&format);
|
|
let writer = hound::WavWriter::create(PATH, spec).unwrap();
|
|
let writer = std::sync::Arc::new(std::sync::Mutex::new(Some(writer)));
|
|
|
|
// A flag to indicate that recording is in progress.
|
|
println!("Begin recording...");
|
|
let recording = std::sync::Arc::new(std::sync::atomic::AtomicBool::new(true));
|
|
|
|
// Run the input stream on a separate thread.
|
|
let writer_2 = writer.clone();
|
|
let recording_2 = recording.clone();
|
|
std::thread::spawn(move || {
|
|
event_loop.run(move |_, data| {
|
|
// If we're done recording, return early.
|
|
if !recording_2.load(std::sync::atomic::Ordering::Relaxed) {
|
|
return;
|
|
}
|
|
// Otherwise write to the wav writer.
|
|
match data {
|
|
cpal::StreamData::Input { buffer: cpal::UnknownTypeInputBuffer::U16(buffer) } => {
|
|
if let Ok(mut guard) = writer_2.try_lock() {
|
|
if let Some(writer) = guard.as_mut() {
|
|
for sample in buffer.iter() {
|
|
let sample = cpal::Sample::to_i16(sample);
|
|
writer.write_sample(sample).ok();
|
|
}
|
|
}
|
|
}
|
|
},
|
|
cpal::StreamData::Input { buffer: cpal::UnknownTypeInputBuffer::I16(buffer) } => {
|
|
if let Ok(mut guard) = writer_2.try_lock() {
|
|
if let Some(writer) = guard.as_mut() {
|
|
for &sample in buffer.iter() {
|
|
writer.write_sample(sample).ok();
|
|
}
|
|
}
|
|
}
|
|
},
|
|
cpal::StreamData::Input { buffer: cpal::UnknownTypeInputBuffer::F32(buffer) } => {
|
|
if let Ok(mut guard) = writer_2.try_lock() {
|
|
if let Some(writer) = guard.as_mut() {
|
|
for &sample in buffer.iter() {
|
|
writer.write_sample(sample).ok();
|
|
}
|
|
}
|
|
}
|
|
},
|
|
_ => (),
|
|
}
|
|
});
|
|
});
|
|
|
|
// Let recording go for roughly three seconds.
|
|
std::thread::sleep(std::time::Duration::from_secs(3));
|
|
recording.store(false, std::sync::atomic::Ordering::Relaxed);
|
|
writer.lock().unwrap().take().unwrap().finalize().unwrap();
|
|
println!("Recording {} complete!", PATH);
|
|
}
|
|
|
|
fn sample_format(format: cpal::SampleFormat) -> hound::SampleFormat {
|
|
match format {
|
|
cpal::SampleFormat::U16 => hound::SampleFormat::Int,
|
|
cpal::SampleFormat::I16 => hound::SampleFormat::Int,
|
|
cpal::SampleFormat::F32 => hound::SampleFormat::Float,
|
|
}
|
|
}
|
|
|
|
fn wav_spec_from_format(format: &cpal::Format) -> hound::WavSpec {
|
|
hound::WavSpec {
|
|
channels: format.channels as _,
|
|
sample_rate: format.sample_rate.0 as _,
|
|
bits_per_sample: (format.data_type.sample_size() * 8) as _,
|
|
sample_format: sample_format(format.data_type),
|
|
}
|
|
}
|