686 lines
29 KiB
Rust
686 lines
29 KiB
Rust
extern crate asio_sys as sys;
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extern crate num_traits;
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use std;
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use Format;
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use CreationError;
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use StreamData;
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use super::Device;
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use UnknownTypeInputBuffer;
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use UnknownTypeOutputBuffer;
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use std::sync::{Arc, Mutex};
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use std::mem;
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use std::sync::atomic::{AtomicUsize, Ordering};
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use SampleFormat;
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use super::asio_utils as au;
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use self::num_traits::PrimInt;
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pub struct EventLoop {
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asio_streams: Arc<Mutex<sys::AsioStreams>>,
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cpal_streams: Arc<Mutex<Vec<Option<Stream>>>>,
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stream_count: AtomicUsize,
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callbacks: Arc<Mutex<Vec<&'static mut (FnMut(StreamId, StreamData) + Send)>>>,
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}
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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pub struct StreamId(usize);
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pub struct InputBuffer<'a, T: 'a> {
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buffer: &'a [T],
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}
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pub struct OutputBuffer<'a, T: 'a> {
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buffer: &'a mut [T],
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}
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struct Stream{
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playing: bool,
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}
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#[derive(Default)]
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struct I16Buffer{
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cpal: Vec<i16>,
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channel: Vec<Vec<i16>>,
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}
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#[derive(Default)]
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struct U16Buffer{
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cpal: Vec<u16>,
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channel: Vec<Vec<u16>>,
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}
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#[derive(Default)]
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struct F32Buffer{
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cpal: Vec<f32>,
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channel: Vec<Vec<f32>>,
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}
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struct Buffers {
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i16_buff: I16Buffer,
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u16_buff: U16Buffer,
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f32_buff: F32Buffer,
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}
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enum Endian {
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Little,
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Big,
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}
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impl EventLoop {
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pub fn new() -> EventLoop {
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EventLoop {
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asio_streams: Arc::new(Mutex::new(sys::AsioStreams{input: None, output: None})),
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cpal_streams: Arc::new(Mutex::new(Vec::new())),
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stream_count: AtomicUsize::new(0),
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callbacks: Arc::new(Mutex::new(Vec::new())),
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}
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}
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/// Create a new CPAL Input Stream
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/// If there is no ASIO Input Stream
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/// it will be created
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fn get_input_stream(&self, drivers: &sys::Drivers, format: &Format) -> Result<usize, CreationError> {
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let Format {
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channels,
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sample_rate,
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..
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} = format;
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let num_channels = *channels as usize;
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let sample_rate = sample_rate.0;
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let ref mut streams = *self.asio_streams.lock().unwrap();
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if sample_rate != drivers.get_sample_rate().rate {
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if drivers.can_sample_rate(sample_rate) {
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drivers.set_sample_rate(sample_rate).expect("Unsupported sample rate");
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} else {
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panic!("This sample rate {:?} is not supported", sample_rate);
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}
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}
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match streams.input {
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Some(ref input) => Ok(input.buffer_size as usize),
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None => {
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let output = streams.output.take();
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drivers.prepare_input_stream(output, num_channels)
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.map(|new_streams| {
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let bs = match new_streams.input {
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Some(ref inp) => inp.buffer_size as usize,
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None => unreachable!(),
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};
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*streams = new_streams;
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bs
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})
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.map_err(|ref e| {
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println!("Error preparing stream: {}", e);
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CreationError::DeviceNotAvailable
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})
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}
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}
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}
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fn get_output_stream(&self, drivers: &sys::Drivers, format: &Format) -> Result<usize, CreationError> {
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let Format {
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channels,
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sample_rate,
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..
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} = format;
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let num_channels = *channels as usize;
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let sample_rate = sample_rate.0;
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let ref mut streams = *self.asio_streams.lock().unwrap();
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if sample_rate != drivers.get_sample_rate().rate {
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if drivers.can_sample_rate(sample_rate) {
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drivers.set_sample_rate(sample_rate).expect("Unsupported sample rate");
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} else {
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panic!("This sample rate {:?} is not supported", sample_rate);
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}
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}
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match streams.output {
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Some(ref output) => Ok(output.buffer_size as usize),
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None => {
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let input = streams.input.take();
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drivers.prepare_output_stream(input, num_channels)
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.map(|new_streams| {
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let bs = match new_streams.output {
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Some(ref out) => out.buffer_size as usize,
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None => unreachable!(),
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};
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*streams = new_streams;
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bs
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})
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.map_err(|ref e| {
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println!("Error preparing stream: {}", e);
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CreationError::DeviceNotAvailable
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})
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},
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}
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}
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pub fn build_input_stream(
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&self,
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device: &Device,
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format: &Format,
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) -> Result<StreamId, CreationError> {
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let Device {
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drivers,
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..
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} = device;
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let num_channels = format.channels.clone();
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let stream_type = drivers.get_data_type().expect("Couldn't load data type");
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self.get_input_stream(&drivers, format).map(|stream_buffer_size| {
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let cpal_num_samples = stream_buffer_size * num_channels as usize;
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let count = self.stream_count.load(Ordering::SeqCst);
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self.stream_count.store(count + 1, Ordering::SeqCst);
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let asio_streams = self.asio_streams.clone();
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let cpal_streams = self.cpal_streams.clone();
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let callbacks = self.callbacks.clone();
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// Create buffers
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let channel_len = cpal_num_samples
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/ num_channels as usize;
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let mut buffers = match format.data_type{
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SampleFormat::I16 => {
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Buffers{
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i16_buff: I16Buffer{
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cpal: vec![0 as i16; cpal_num_samples],
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channel: (0..num_channels)
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.map(|_| Vec::with_capacity(channel_len))
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.collect()},
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u16_buff: U16Buffer::default(),
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f32_buff: F32Buffer::default(),
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}
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}
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SampleFormat::U16 => {
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Buffers{
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i16_buff: I16Buffer::default(),
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u16_buff: U16Buffer{
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cpal: vec![0 as u16; cpal_num_samples],
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channel: (0..num_channels)
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.map(|_| Vec::with_capacity(channel_len))
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.collect()},
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f32_buff: F32Buffer::default(),
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}
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}
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SampleFormat::F32 => {
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Buffers{
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i16_buff: I16Buffer::default(),
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u16_buff: U16Buffer::default(),
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f32_buff: F32Buffer{
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cpal: vec![0 as f32; cpal_num_samples],
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channel: (0..num_channels)
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.map(|_| Vec::with_capacity(channel_len))
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.collect()},
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}
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}
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};
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sys::set_callback(move |index| unsafe {
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//if not playing return early
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{
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if let Some(s) = cpal_streams.lock().unwrap().get(count - 1){
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if let Some(s) = s{
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if !s.playing { return (); }
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}
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}
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}
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if let Some(ref asio_stream) = asio_streams.lock().unwrap().input {
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// Number of samples needed total
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let mut callbacks = callbacks.lock().unwrap();
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// Theres only a single callback because theres only one event loop
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match callbacks.first_mut() {
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Some(callback) => {
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macro_rules! convert_sample {
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($AsioTypeIdent:ident,
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u16,
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$SampleTypeIdent:ident,
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$Sample:expr
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) => {
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((*$Sample as f64 + $AsioTypeIdent::MAX as f64) /
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(::std::u16::MAX as f64 /
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::std::AsioTypeIdent::MAX as f64)) as u16
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};
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($AsioTypeIdent:ident,
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$SampleType:ty,
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$SampleTypeIdent:ident,
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$Sample:expr
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) => {
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(*$Sample as i64 *
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::std::$SampleTypeIdent::MAX as i64 /
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::std::$AsioTypeIdent::MAX as i64) as $SampleType
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};
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};
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macro_rules! try_callback {
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($SampleFormat:ident,
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$SampleType:ty,
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$SampleTypeIdent:ident,
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$AsioType:ty,
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$AsioTypeIdent:ident,
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$Buffers:expr,
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$BuffersType:ty,
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$BuffersTypeIdent:ident,
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$Endianness:expr,
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$ConvertEndian:expr
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) => {
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// For each channel write the cpal data to
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// the asio buffer
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// Also need to check for Endian
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for (i, channel) in $Buffers.channel.iter_mut().enumerate(){
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let buff_ptr = asio_stream
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.buffer_infos[i]
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.buffers[index as usize] as *mut $AsioType;
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let asio_buffer: &'static [$AsioType] =
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std::slice::from_raw_parts(
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buff_ptr,
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asio_stream.buffer_size as usize);
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for asio_s in asio_buffer.iter(){
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channel.push( $ConvertEndian(convert_sample!(
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$AsioTypeIdent,
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$SampleType,
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$SampleTypeIdent,
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asio_s), $Endianness));
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}
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}
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// interleave all the channels
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{
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let $BuffersTypeIdent {
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cpal: ref mut c_buffer,
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channel: ref mut channels,
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} = $Buffers;
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au::interleave(&channels, c_buffer);
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for c in channels.iter_mut() {
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c.clear();
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}
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}
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let buff = InputBuffer{
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buffer: &mut $Buffers.cpal,
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};
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callback(
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StreamId(count),
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StreamData::Input{
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buffer: UnknownTypeInputBuffer::$SampleFormat(
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::InputBuffer{
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buffer: Some(super::super::InputBuffer::Asio(buff))
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})
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}
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);
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}
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};
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// Generic over types
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// TODO check for endianess
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match stream_type {
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sys::AsioSampleType::ASIOSTInt32LSB => {
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try_callback!(I16, i16, i16, i32, i32,
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buffers.i16_buff, I16Buffer, I16Buffer,
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Endian::Little, convert_endian_to);
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}
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sys::AsioSampleType::ASIOSTInt16LSB => {
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try_callback!(I16, i16, i16, i16, i16,
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buffers.i16_buff, I16Buffer, I16Buffer,
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Endian::Little, convert_endian_to);
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}
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sys::AsioSampleType::ASIOSTInt32MSB => {
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try_callback!(I16, i16, i16, i32, i32,
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buffers.i16_buff, I16Buffer, I16Buffer,
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Endian::Big, convert_endian_to);
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}
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sys::AsioSampleType::ASIOSTInt16MSB => {
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try_callback!(I16, i16, i16, i16, i16,
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buffers.i16_buff, I16Buffer, I16Buffer,
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Endian::Big, convert_endian_to);
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}
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sys::AsioSampleType::ASIOSTFloat32LSB => {
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try_callback!(F32, f32, f32, f32, f32,
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buffers.f32_buff, F32Buffer, F32Buffer,
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Endian::Little, |a, _| a);
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}
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sys::AsioSampleType::ASIOSTFloat64LSB => {
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try_callback!(F32, f32, f32, f64, f64,
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buffers.f32_buff, F32Buffer, F32Buffer,
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Endian::Little, |a, _| a);
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}
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sys::AsioSampleType::ASIOSTFloat32MSB => {
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try_callback!(F32, f32, f32, f32, f32,
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buffers.f32_buff, F32Buffer, F32Buffer,
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Endian::Big, |a, _| a);
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}
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sys::AsioSampleType::ASIOSTFloat64MSB => {
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try_callback!(F32, f32, f32, f64, f64,
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buffers.f32_buff, F32Buffer, F32Buffer,
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Endian::Big, |a, _| a);
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}
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_ => println!("unsupported format {:?}", stream_type),
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}
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}
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None => return (),
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}
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}
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});
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self.cpal_streams.lock().unwrap().push(Some(Stream{ playing: false }));
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StreamId(count)
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})
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}
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pub fn build_output_stream(
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&self,
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device: &Device,
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format: &Format,
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) -> Result<StreamId, CreationError> {
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let Device {
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drivers,
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..
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} = device;
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let num_channels = format.channels.clone();
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let stream_type = drivers.get_data_type().expect("Couldn't load data type");
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self.get_output_stream(&drivers, format).map(|stream_buffer_size| {
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let cpal_num_samples = stream_buffer_size * num_channels as usize;
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let count = self.stream_count.load(Ordering::SeqCst);
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self.stream_count.store(count + 1, Ordering::SeqCst);
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let asio_streams = self.asio_streams.clone();
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let cpal_streams = self.cpal_streams.clone();
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let callbacks = self.callbacks.clone();
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// Create buffers
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let channel_len = cpal_num_samples
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/ num_channels as usize;
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let mut re_buffers = match format.data_type{
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SampleFormat::I16 => {
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Buffers{
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i16_buff: I16Buffer{
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cpal: vec![0 as i16; cpal_num_samples],
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channel: (0..num_channels)
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.map(|_| Vec::with_capacity(channel_len))
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.collect()},
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u16_buff: U16Buffer::default(),
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f32_buff: F32Buffer::default(),
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}
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}
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SampleFormat::U16 => {
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Buffers{
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i16_buff: I16Buffer::default(),
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u16_buff: U16Buffer{
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cpal: vec![0 as u16; cpal_num_samples],
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channel: (0..num_channels)
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.map(|_| Vec::with_capacity(channel_len))
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.collect()},
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f32_buff: F32Buffer::default(),
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}
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}
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SampleFormat::F32 => {
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Buffers{
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i16_buff: I16Buffer::default(),
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u16_buff: U16Buffer::default(),
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f32_buff: F32Buffer{
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cpal: vec![0 as f32; cpal_num_samples],
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channel: (0..num_channels)
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.map(|_| Vec::with_capacity(channel_len))
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.collect()},
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}
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}
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};
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sys::set_callback(move |index| unsafe {
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//if not playing return early
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{
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if let Some(s) = cpal_streams.lock().unwrap().get(count - 1){
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if let Some(s) = s{
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if !s.playing { return (); }
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}
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}
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}
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if let Some(ref asio_stream) = asio_streams.lock().unwrap().output {
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// Number of samples needed total
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let mut callbacks = callbacks.lock().unwrap();
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macro_rules! convert_sample {
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($AsioTypeIdent:ident,
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$AsioType:ty,
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u16,
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$Sample:expr
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) => {
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((*$Sample as i64 *
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::std::$AsioTypeIdent::MAX as i64 /
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::std::u16::MAX as i64) - $AsioTypeIdent::MAX as i64) as $AsioType
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};
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($AsioTypeIdent:ident,
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$AsioType:ty,
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$SampleTypeIdent:ident,
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$Sample:expr
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) => {
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(*$Sample as i64 *
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::std::$AsioTypeIdent::MAX as i64 /
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::std::$SampleTypeIdent::MAX as i64) as $AsioType
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};
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};
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// Theres only a single callback because theres only one event loop
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match callbacks.first_mut() {
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Some(callback) => {
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macro_rules! try_callback {
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($SampleFormat:ident,
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$SampleType:ty,
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$SampleTypeIdent:ident,
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$AsioType:ty,
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$AsioTypeIdent:ident,
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$Buffers:expr,
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$BuffersType:ty,
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$BuffersTypeIdent:ident,
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$Endianness:expr,
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$ConvertEndian:expr
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) => {
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let mut my_buffers = $Buffers;
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{
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let buff = OutputBuffer{
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buffer: &mut my_buffers.cpal
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};
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callback(
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StreamId(count),
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StreamData::Output{
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buffer: UnknownTypeOutputBuffer::$SampleFormat(
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::OutputBuffer{
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target: Some(super::super::OutputBuffer::Asio(buff))
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})
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}
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);
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}
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// Deinter all the channels
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{
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let $BuffersTypeIdent {
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cpal: ref mut c_buffer,
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channel: ref mut channels,
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} = my_buffers;
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au::deinterleave(&c_buffer[..], channels);
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}
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let silence = match index {
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0 =>{
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if !sys::SILENCE_FIRST.load(Ordering::SeqCst) {
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sys::SILENCE_FIRST.store(true, Ordering::SeqCst);
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sys::SILENCE_SECOND.store(false, Ordering::SeqCst);
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true
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}else{false}
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},
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1 =>{
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if !sys::SILENCE_SECOND.load(Ordering::SeqCst) {
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sys::SILENCE_SECOND.store(true, Ordering::SeqCst);
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sys::SILENCE_FIRST.store(false, Ordering::SeqCst);
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true
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}else{false}
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},
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_ => unreachable!(),
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};
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|
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// For each channel write the cpal data to
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// the asio buffer
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for (i, channel) in my_buffers.channel.iter().enumerate(){
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let buff_ptr = asio_stream
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.buffer_infos[i]
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|
.buffers[index as usize] as *mut $AsioType;
|
|
let asio_buffer: &'static mut [$AsioType] =
|
|
std::slice::from_raw_parts_mut(
|
|
buff_ptr,
|
|
asio_stream.buffer_size as usize);
|
|
for (asio_s, cpal_s) in asio_buffer.iter_mut()
|
|
.zip(channel){
|
|
if silence { *asio_s = 0.0 as $AsioType; }
|
|
*asio_s += $ConvertEndian(convert_sample!(
|
|
$AsioTypeIdent,
|
|
$AsioType,
|
|
$SampleTypeIdent,
|
|
cpal_s
|
|
),
|
|
$Endianness);
|
|
}
|
|
|
|
}
|
|
};
|
|
}
|
|
// Generic over types
|
|
match stream_type {
|
|
sys::AsioSampleType::ASIOSTInt32LSB => {
|
|
try_callback!(I16, i16, i16, i32, i32,
|
|
&mut re_buffers.i16_buff, I16Buffer, I16Buffer,
|
|
Endian::Little, convert_endian_from);
|
|
}
|
|
sys::AsioSampleType::ASIOSTInt16LSB => {
|
|
try_callback!(I16, i16, i16, i16, i16,
|
|
&mut re_buffers.i16_buff, I16Buffer, I16Buffer,
|
|
Endian::Little, convert_endian_from);
|
|
}
|
|
sys::AsioSampleType::ASIOSTInt32MSB => {
|
|
try_callback!(I16, i16, i16, i32, i32,
|
|
&mut re_buffers.i16_buff, I16Buffer, I16Buffer,
|
|
Endian::Big, convert_endian_from);
|
|
}
|
|
sys::AsioSampleType::ASIOSTInt16MSB => {
|
|
try_callback!(I16, i16, i16, i16, i16,
|
|
&mut re_buffers.i16_buff, I16Buffer, I16Buffer,
|
|
Endian::Big, convert_endian_from);
|
|
}
|
|
sys::AsioSampleType::ASIOSTFloat32LSB => {
|
|
try_callback!(F32, f32, f32, f32, f32,
|
|
&mut re_buffers.f32_buff, F32Buffer, F32Buffer,
|
|
Endian::Little, |a, _| a);
|
|
}
|
|
sys::AsioSampleType::ASIOSTFloat64LSB => {
|
|
try_callback!(F32, f32, f32, f64, f64,
|
|
&mut re_buffers.f32_buff, F32Buffer, F32Buffer,
|
|
Endian::Little, |a, _| a);
|
|
}
|
|
sys::AsioSampleType::ASIOSTFloat32MSB => {
|
|
try_callback!(F32, f32, f32, f32, f32,
|
|
&mut re_buffers.f32_buff, F32Buffer, F32Buffer,
|
|
Endian::Big, |a, _| a);
|
|
}
|
|
sys::AsioSampleType::ASIOSTFloat64MSB => {
|
|
try_callback!(F32, f32, f32, f64, f64,
|
|
&mut re_buffers.f32_buff, F32Buffer, F32Buffer,
|
|
Endian::Big, |a, _| a);
|
|
}
|
|
_ => println!("unsupported format {:?}", stream_type),
|
|
}
|
|
}
|
|
None => return (),
|
|
}
|
|
}
|
|
});
|
|
self.cpal_streams.lock().unwrap().push(Some(Stream{ playing: false }));
|
|
StreamId(count)
|
|
})
|
|
}
|
|
|
|
|
|
pub fn play_stream(&self, stream_id: StreamId) {
|
|
let mut streams = self.cpal_streams.lock().unwrap();
|
|
if let Some(s) = streams.get_mut(stream_id.0).expect("Bad play stream index") {
|
|
s.playing = true;
|
|
}
|
|
// Calling play when already playing is a no-op
|
|
sys::play();
|
|
}
|
|
|
|
pub fn pause_stream(&self, stream_id: StreamId) {
|
|
let mut streams = self.cpal_streams.lock().unwrap();
|
|
if let Some(s) = streams.get_mut(stream_id.0).expect("Bad pause stream index") {
|
|
s.playing = false;
|
|
}
|
|
let any_playing = streams
|
|
.iter()
|
|
.filter(|s| if let Some(s) = s {
|
|
s.playing
|
|
} else {false} )
|
|
.next();
|
|
if let None = any_playing {
|
|
sys::stop();
|
|
}
|
|
}
|
|
|
|
pub fn destroy_stream(&self, stream_id: StreamId) {
|
|
let mut streams = self.cpal_streams.lock().unwrap();
|
|
streams.get_mut(stream_id.0).take();
|
|
let count = self.stream_count.load(Ordering::SeqCst);
|
|
self.stream_count.store(count - 1, Ordering::SeqCst);
|
|
if count == 1 {
|
|
*self.asio_streams.lock().unwrap() = sys::AsioStreams{ output: None, input: None };
|
|
sys::clean_up();
|
|
}
|
|
}
|
|
|
|
pub fn run<F>(&self, mut callback: F) -> !
|
|
where
|
|
F: FnMut(StreamId, StreamData) + Send,
|
|
{
|
|
let callback: &mut (FnMut(StreamId, StreamData) + Send) = &mut callback;
|
|
self.callbacks
|
|
.lock()
|
|
.unwrap()
|
|
.push(unsafe { mem::transmute(callback) });
|
|
loop {
|
|
// Might need a sleep here to prevent the loop being
|
|
// removed in --release
|
|
}
|
|
}
|
|
}
|
|
|
|
impl Drop for EventLoop {
|
|
fn drop(&mut self) {
|
|
sys::clean_up();
|
|
}
|
|
}
|
|
|
|
impl<'a, T> InputBuffer<'a, T> {
|
|
pub fn buffer(&self) -> &[T] {
|
|
&self.buffer
|
|
}
|
|
pub fn finish(self) {
|
|
}
|
|
}
|
|
|
|
impl<'a, T> OutputBuffer<'a, T> {
|
|
pub fn buffer(&mut self) -> &mut [T] {
|
|
&mut self.buffer
|
|
}
|
|
|
|
pub fn len(&self) -> usize {
|
|
self.buffer.len()
|
|
}
|
|
|
|
pub fn finish(self) {}
|
|
}
|
|
|
|
fn convert_endian_to<T: PrimInt>(sample: T, endian: Endian) -> T {
|
|
match endian {
|
|
Endian::Big => sample.to_be(),
|
|
Endian::Little => sample.to_le(),
|
|
}
|
|
}
|
|
|
|
fn convert_endian_from<T: PrimInt>(sample: T, endian: Endian) -> T {
|
|
match endian {
|
|
Endian::Big => T::from_be(sample),
|
|
Endian::Little => T::from_le(sample),
|
|
}
|
|
} |