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| 1 | +//! Slightly less efficient microphone that multiple sources can draw from |
| 2 | +//! think of it as an inverse mixer. |
| 3 | +
|
| 4 | +use std::{ |
| 5 | + sync::{ |
| 6 | + atomic::{AtomicBool, Ordering}, |
| 7 | + mpsc, Arc, |
| 8 | + }, |
| 9 | + thread::{self, JoinHandle}, |
| 10 | + time::Duration, |
| 11 | +}; |
| 12 | + |
| 13 | +use cpal::Device; |
| 14 | +use rtrb::RingBuffer; |
| 15 | + |
| 16 | +use crate::{microphone::open_input_stream, Source}; |
| 17 | +use crate::{ |
| 18 | + microphone::{InputConfig, OpenError}, |
| 19 | + Sample, |
| 20 | +}; |
| 21 | + |
| 22 | +/// Send on all platforms |
| 23 | +pub struct Microphone { |
| 24 | + _stream_thread: JoinHandle<()>, |
| 25 | + buffer: rtrb::Consumer<Sample>, |
| 26 | + config: InputConfig, |
| 27 | + poll_interval: Duration, |
| 28 | + error_occurred: Arc<AtomicBool>, |
| 29 | + _drop_tx: mpsc::Sender<()>, |
| 30 | +} |
| 31 | + |
| 32 | +impl Microphone { |
| 33 | + pub(crate) fn open( |
| 34 | + device: Device, |
| 35 | + config: InputConfig, |
| 36 | + mut error_callback: impl FnMut(cpal::StreamError) + Send + 'static, |
| 37 | + ) -> Result<Self, OpenError> { |
| 38 | + let hundred_ms_of_samples = |
| 39 | + config.channel_count.get() as u32 * config.sample_rate.get() / 10; |
| 40 | + let (tx, rx) = RingBuffer::new(hundred_ms_of_samples as usize); |
| 41 | + let error_occurred = Arc::new(AtomicBool::new(false)); |
| 42 | + let error_callback = { |
| 43 | + let error_occurred = error_occurred.clone(); |
| 44 | + move |source| { |
| 45 | + error_occurred.store(true, Ordering::Relaxed); |
| 46 | + error_callback(source); |
| 47 | + } |
| 48 | + }; |
| 49 | + |
| 50 | + let (res_tx, res_rx) = mpsc::channel(); |
| 51 | + let (_drop_tx, drop_rx) = mpsc::channel::<()>(); |
| 52 | + let _stream_thread = thread::Builder::new() |
| 53 | + .name("Rodio cloneable microphone".to_string()) |
| 54 | + .spawn(move || { |
| 55 | + if let Err(e) = open_input_stream(device, config, tx, error_callback) { |
| 56 | + let _ = res_tx.send(Err(e)); |
| 57 | + } else { |
| 58 | + let _ = res_tx.send(Ok(())); |
| 59 | + }; |
| 60 | + |
| 61 | + let _should_drop = drop_rx.recv(); |
| 62 | + }) |
| 63 | + .expect("Should be able to spawn threads"); |
| 64 | + |
| 65 | + res_rx |
| 66 | + .recv() |
| 67 | + .expect("input stream thread should never panic")?; |
| 68 | + |
| 69 | + Ok(Microphone { |
| 70 | + _stream_thread, |
| 71 | + _drop_tx, |
| 72 | + buffer: rx, |
| 73 | + config, |
| 74 | + poll_interval: Duration::from_millis(5), |
| 75 | + error_occurred, |
| 76 | + }) |
| 77 | + } |
| 78 | + |
| 79 | + /// Get the configuration. |
| 80 | + /// |
| 81 | + /// # Example |
| 82 | + /// Print the sample rate and channel count. |
| 83 | + /// ```no_run |
| 84 | + /// # use rodio::microphone::MicrophoneBuilder; |
| 85 | + /// # fn main() -> Result<(), Box<dyn std::error::Error>> { |
| 86 | + /// let mic = MicrophoneBuilder::new() |
| 87 | + /// .default_device()? |
| 88 | + /// .default_config()? |
| 89 | + /// .open_stream()?; |
| 90 | + /// let config = mic.config(); |
| 91 | + /// println!("Sample rate: {}", config.sample_rate.get()); |
| 92 | + /// println!("Channel count: {}", config.channel_count.get()); |
| 93 | + /// # Ok(()) |
| 94 | + /// # } |
| 95 | + /// ``` |
| 96 | + pub fn config(&self) -> &InputConfig { |
| 97 | + &self.config |
| 98 | + } |
| 99 | +} |
| 100 | + |
| 101 | +impl Source for Microphone { |
| 102 | + fn current_span_len(&self) -> Option<usize> { |
| 103 | + None |
| 104 | + } |
| 105 | + |
| 106 | + fn channels(&self) -> crate::ChannelCount { |
| 107 | + self.config.channel_count |
| 108 | + } |
| 109 | + |
| 110 | + fn sample_rate(&self) -> crate::SampleRate { |
| 111 | + self.config.sample_rate |
| 112 | + } |
| 113 | + |
| 114 | + fn total_duration(&self) -> Option<std::time::Duration> { |
| 115 | + None |
| 116 | + } |
| 117 | +} |
| 118 | + |
| 119 | +impl Iterator for Microphone { |
| 120 | + type Item = f32; |
| 121 | + |
| 122 | + fn next(&mut self) -> Option<Self::Item> { |
| 123 | + loop { |
| 124 | + if let Ok(sample) = self.buffer.pop() { |
| 125 | + return Some(sample); |
| 126 | + } else if self.error_occurred.load(Ordering::Relaxed) { |
| 127 | + return None; |
| 128 | + } else { |
| 129 | + thread::sleep(self.poll_interval) |
| 130 | + } |
| 131 | + } |
| 132 | + } |
| 133 | + |
| 134 | + fn size_hint(&self) -> (usize, Option<usize>) { |
| 135 | + (self.buffer.slots(), None) |
| 136 | + } |
| 137 | +} |
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