2018-10-12 05:54:26 +00:00
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extern crate asio_sys as sys;
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2018-11-01 06:58:50 +00:00
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extern crate num_traits;
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2018-10-12 05:54:26 +00:00
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2018-11-05 01:41:15 +00:00
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use self::num_traits::PrimInt;
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use super::asio_utils as au;
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use super::Device;
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2018-10-12 05:54:26 +00:00
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use std;
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2018-11-05 01:41:15 +00:00
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use std::mem;
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use std::sync::atomic::{AtomicUsize, Ordering};
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use std::sync::{Arc, Mutex};
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2018-11-07 07:38:33 +00:00
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use std::thread;
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use std::time::Duration;
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2019-06-27 18:43:58 +00:00
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use BackendSpecificError;
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2019-06-26 14:24:23 +00:00
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use BuildStreamError;
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2018-11-05 01:41:15 +00:00
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use Format;
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2019-06-26 14:24:23 +00:00
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use PauseStreamError;
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use PlayStreamError;
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2018-11-05 01:41:15 +00:00
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use SampleFormat;
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2018-10-12 05:54:26 +00:00
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use StreamData;
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2019-06-26 14:24:23 +00:00
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use StreamDataResult;
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2018-10-12 05:54:26 +00:00
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use UnknownTypeInputBuffer;
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2018-10-30 05:50:20 +00:00
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use UnknownTypeOutputBuffer;
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2018-10-12 05:54:26 +00:00
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2019-06-28 17:00:13 +00:00
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/// Sample types whose constant silent value is known.
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trait Silence {
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const SILENCE: Self;
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}
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/// Constraints on the interleaved sample buffer format required by the CPAL API.
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trait InterleavedSample: Clone + Copy + Silence {
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fn unknown_type_output_buffer(&mut [Self]) -> UnknownTypeOutputBuffer;
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}
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/// Constraints on the ASIO sample types.
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trait AsioSample: Clone + Copy + Silence + std::ops::Add<Self, Output = Self> {}
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2018-11-05 01:41:15 +00:00
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/// Controls all streams
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2018-10-12 05:54:26 +00:00
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pub struct EventLoop {
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2018-11-05 01:41:15 +00:00
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/// The input and output ASIO streams
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2018-10-29 11:57:42 +00:00
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asio_streams: Arc<Mutex<sys::AsioStreams>>,
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2018-11-05 01:41:15 +00:00
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/// List of all CPAL streams
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2018-10-30 03:27:50 +00:00
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cpal_streams: Arc<Mutex<Vec<Option<Stream>>>>,
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2018-11-05 01:41:15 +00:00
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/// Total stream count
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2018-10-24 06:34:31 +00:00
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stream_count: AtomicUsize,
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2018-11-05 01:41:15 +00:00
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/// The CPAL callback that the user gives to fill the buffers.
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2019-06-26 14:24:23 +00:00
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callbacks: Arc<Mutex<Option<&'static mut (FnMut(StreamId, StreamDataResult) + Send)>>>,
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2018-10-12 05:54:26 +00:00
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}
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2018-11-05 01:41:15 +00:00
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/// Id for each stream.
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/// Created depending on the number they are created.
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/// Starting at one! not zero.
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2019-06-28 17:00:13 +00:00
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#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
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2018-10-12 05:54:26 +00:00
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pub struct StreamId(usize);
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2018-11-05 01:41:15 +00:00
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/// CPAL stream.
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/// This decouples the many cpal streams
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/// from the single input and single output
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/// ASIO streams.
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/// Each stream can be playing or paused.
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struct Stream {
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2018-10-30 05:50:20 +00:00
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playing: bool,
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2019-06-27 18:43:58 +00:00
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// The driver associated with this stream.
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driver: Arc<sys::Driver>,
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2018-10-30 03:27:50 +00:00
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}
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2018-10-12 12:38:55 +00:00
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struct Buffers {
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2019-06-28 17:00:13 +00:00
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interleaved: Vec<u8>,
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non_interleaved: Vec<u8>,
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2018-10-12 12:38:55 +00:00
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}
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2018-11-01 06:58:50 +00:00
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enum Endian {
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Little,
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Big,
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}
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2019-06-28 17:00:13 +00:00
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// Used to keep track of whether or not the current current asio stream buffer requires
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// being silencing before summing audio.
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#[derive(Default)]
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struct SilenceAsioBuffer {
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first: bool,
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second: bool,
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}
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2018-10-12 05:54:26 +00:00
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impl EventLoop {
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pub fn new() -> EventLoop {
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EventLoop {
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2018-11-05 01:41:15 +00:00
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asio_streams: Arc::new(Mutex::new(sys::AsioStreams {
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input: None,
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output: None,
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})),
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2018-10-30 03:27:50 +00:00
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cpal_streams: Arc::new(Mutex::new(Vec::new())),
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2018-11-05 01:41:15 +00:00
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// This is why the Id's count from one not zero
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// because at this point there is no streams
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2018-10-24 06:34:31 +00:00
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stream_count: AtomicUsize::new(0),
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2018-11-07 07:38:33 +00:00
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callbacks: Arc::new(Mutex::new(None)),
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2018-10-12 05:54:26 +00:00
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}
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}
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2018-11-07 09:42:00 +00:00
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fn check_format(
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2018-11-07 07:38:33 +00:00
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&self,
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2019-06-27 18:43:58 +00:00
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driver: &sys::Driver,
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2018-11-07 07:38:33 +00:00
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format: &Format,
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2019-06-26 14:24:23 +00:00
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num_asio_channels: u16,
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) -> Result<(), BuildStreamError> {
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2018-11-04 10:23:24 +00:00
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let Format {
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channels,
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sample_rate,
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2018-11-07 09:42:00 +00:00
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data_type,
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2018-11-04 10:23:24 +00:00
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} = format;
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2018-11-05 01:41:15 +00:00
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// Try and set the sample rate to what the user selected.
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2019-06-27 18:43:58 +00:00
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let sample_rate = sample_rate.0.into();
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if sample_rate != driver.sample_rate().map_err(build_stream_err)? {
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if driver.can_sample_rate(sample_rate).map_err(build_stream_err)? {
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driver
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2018-11-05 01:41:15 +00:00
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.set_sample_rate(sample_rate)
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2019-06-27 18:43:58 +00:00
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.map_err(build_stream_err)?;
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2018-11-05 01:41:15 +00:00
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} else {
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2019-06-26 14:24:23 +00:00
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return Err(BuildStreamError::FormatNotSupported);
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2018-10-29 11:57:42 +00:00
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}
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2018-11-05 01:41:15 +00:00
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}
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2018-11-07 09:42:00 +00:00
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// unsigned formats are not supported by asio
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match data_type {
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SampleFormat::I16 | SampleFormat::F32 => (),
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2019-06-26 14:24:23 +00:00
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SampleFormat::U16 => return Err(BuildStreamError::FormatNotSupported),
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2018-11-07 09:42:00 +00:00
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}
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if *channels > num_asio_channels {
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2019-06-26 14:24:23 +00:00
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return Err(BuildStreamError::FormatNotSupported);
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2018-11-07 09:42:00 +00:00
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}
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Ok(())
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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(
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&self,
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2019-06-27 18:43:58 +00:00
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driver: &sys::Driver,
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2018-11-07 09:42:00 +00:00
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format: &Format,
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device: &Device,
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2019-06-26 14:24:23 +00:00
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) -> Result<usize, BuildStreamError> {
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2018-11-07 09:42:00 +00:00
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match device.default_input_format() {
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Ok(f) => {
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let num_asio_channels = f.channels;
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2019-06-27 18:43:58 +00:00
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self.check_format(driver, format, num_asio_channels)
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2018-11-07 09:42:00 +00:00
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},
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2019-06-26 14:24:23 +00:00
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Err(_) => Err(BuildStreamError::FormatNotSupported),
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2018-11-07 09:42:00 +00:00
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}?;
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let num_channels = format.channels as usize;
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let ref mut streams = *self.asio_streams.lock().unwrap();
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2018-11-05 01:41:15 +00:00
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// Either create a stream if thers none or had back the
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// size of the current one.
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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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2019-06-27 18:43:58 +00:00
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driver
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2018-11-05 01:41:15 +00:00
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.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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}).map_err(|ref e| {
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println!("Error preparing stream: {}", e);
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2019-06-26 14:24:23 +00:00
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BuildStreamError::DeviceNotAvailable
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2018-11-05 01:41:15 +00:00
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})
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2018-11-07 07:38:33 +00:00
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}
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2018-11-05 01:41:15 +00:00
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}
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2018-10-29 11:57:42 +00:00
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}
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2018-11-05 01:41:15 +00:00
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/// Create a new CPAL Output Stream.
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/// If there is no ASIO Output Stream
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/// it will be created.
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fn get_output_stream(
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2018-11-07 07:38:33 +00:00
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&self,
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2019-06-27 18:43:58 +00:00
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driver: &sys::Driver,
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2018-11-07 07:38:33 +00:00
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format: &Format,
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2018-11-07 09:42:00 +00:00
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device: &Device,
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2019-06-26 14:24:23 +00:00
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) -> Result<usize, BuildStreamError> {
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2018-11-07 09:42:00 +00:00
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match device.default_output_format() {
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Ok(f) => {
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let num_asio_channels = f.channels;
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2019-06-27 18:43:58 +00:00
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self.check_format(driver, format, num_asio_channels)
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2018-11-07 09:42:00 +00:00
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},
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2019-06-26 14:24:23 +00:00
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Err(_) => Err(BuildStreamError::FormatNotSupported),
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2018-11-07 09:42:00 +00:00
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}?;
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let num_channels = format.channels as usize;
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2018-11-05 01:41:15 +00:00
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let ref mut streams = *self.asio_streams.lock().unwrap();
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// Either create a stream if thers none or had back the
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// size of the current one.
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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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2019-06-27 18:43:58 +00:00
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driver
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2018-11-05 01:41:15 +00:00
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.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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}).map_err(|ref e| {
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println!("Error preparing stream: {}", e);
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2019-06-26 14:24:23 +00:00
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BuildStreamError::DeviceNotAvailable
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2018-11-05 01:41:15 +00:00
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})
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2018-11-07 07:38:33 +00:00
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}
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2018-11-05 01:41:15 +00:00
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}
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2018-10-29 11:57:42 +00:00
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}
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2019-06-26 14:24:23 +00:00
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/// Builds a new cpal input stream
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2018-10-12 05:54:26 +00:00
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pub fn build_input_stream(
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2018-11-07 07:38:33 +00:00
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&self,
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device: &Device,
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format: &Format,
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2019-06-26 14:24:23 +00:00
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) -> Result<StreamId, BuildStreamError> {
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2019-06-28 17:00:13 +00:00
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unimplemented!()
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// let Device { driver, .. } = device;
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// let num_channels = format.channels.clone();
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// let stream_type = driver.data_type().map_err(build_stream_err)?;
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// let stream_buffer_size = self.get_input_stream(&driver, format, device)?;
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// let cpal_num_samples = stream_buffer_size * num_channels as usize;
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// let count = self.stream_count.fetch_add(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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// let channel_len = cpal_num_samples / num_channels as usize;
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// // Create buffers depending on data type
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// // TODO the naming of cpal and channel is confusing.
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// // change it to:
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// // cpal -> interleaved
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// // channels -> per_channel
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// let mut buffers = match format.data_type {
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// SampleFormat::I16 => 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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// },
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// f32_buff: F32Buffer::default(),
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// },
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// SampleFormat::F32 => Buffers {
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// i16_buff: I16Buffer::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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// _ => unimplemented!(),
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// };
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// // Set the input callback.
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// // This is most performance critical part of the ASIO bindings.
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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) {
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// if let Some(s) = s {
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// if !s.playing {
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// return ();
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// }
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// }
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// }
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// }
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// // Get the stream
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// let stream_lock = asio_streams.lock().unwrap();
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// let ref asio_stream = match stream_lock.input {
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// Some(ref asio_stream) => asio_stream,
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// None => return (),
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// };
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// // Get the callback
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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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// let callback = match callbacks.as_mut() {
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// Some(callback) => callback,
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// None => return (),
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// };
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// // Macro to convert sample from ASIO to CPAL type
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// macro_rules! convert_sample {
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// // floats types required different conversion
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// (f32,
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// f32,
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// $SampleTypeIdent:ident,
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// $Sample:expr
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// ) => {
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// *$Sample
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// };
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// (f64,
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// f64,
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// $SampleTypeIdent:ident,
|
|
|
|
// $Sample:expr
|
|
|
|
// ) => {
|
|
|
|
// *$Sample
|
|
|
|
// };
|
|
|
|
// (f64,
|
|
|
|
// f32,
|
|
|
|
// $SampleTypeIdent:ident,
|
|
|
|
// $Sample:expr
|
|
|
|
// ) => {
|
|
|
|
// *$Sample as f32
|
|
|
|
// };
|
|
|
|
// (f32,
|
|
|
|
// f64,
|
|
|
|
// $SampleTypeIdent:ident,
|
|
|
|
// $Sample:expr
|
|
|
|
// ) => {
|
|
|
|
// *$Sample as f64
|
|
|
|
// };
|
|
|
|
// ($AsioTypeIdent:ident,
|
|
|
|
// f32,
|
|
|
|
// $SampleTypeIdent:ident,
|
|
|
|
// $Sample:expr
|
|
|
|
// ) => {
|
|
|
|
// (*$Sample as f64 / ::std::$AsioTypeIdent::MAX as f64) as f32
|
|
|
|
// };
|
|
|
|
// ($AsioTypeIdent:ident,
|
|
|
|
// f64,
|
|
|
|
// $SampleTypeIdent:ident,
|
|
|
|
// $Sample:expr
|
|
|
|
// ) => {
|
|
|
|
// *$Sample as f64 / ::std::$AsioTypeIdent::MAX as f64
|
|
|
|
// };
|
|
|
|
// (f32,
|
|
|
|
// $SampleType:ty,
|
|
|
|
// $SampleTypeIdent:ident,
|
|
|
|
// $Sample:expr
|
|
|
|
// ) => {
|
|
|
|
// (*$Sample as f64 * ::std::$SampleTypeIdent::MAX as f64) as $SampleType
|
|
|
|
// };
|
|
|
|
// (f64,
|
|
|
|
// $SampleType:ty,
|
|
|
|
// $SampleTypeIdent:ident,
|
|
|
|
// $Sample:expr
|
|
|
|
// ) => {
|
|
|
|
// (*$Sample as f64 * ::std::$SampleTypeIdent::MAX as f64) as $SampleType
|
|
|
|
// };
|
|
|
|
// ($AsioTypeIdent:ident,
|
|
|
|
// $SampleType:ty,
|
|
|
|
// $SampleTypeIdent:ident,
|
|
|
|
// $Sample:expr
|
|
|
|
// ) => {
|
|
|
|
// (*$Sample as i64 * ::std::$SampleTypeIdent::MAX as i64
|
|
|
|
// / ::std::$AsioTypeIdent::MAX as i64) as $SampleType
|
|
|
|
// };
|
|
|
|
// };
|
|
|
|
// // This creates gets the buffer and interleaves it.
|
|
|
|
// // It allows it to be done based on the sample type.
|
|
|
|
// macro_rules! try_callback {
|
|
|
|
// ($SampleFormat:ident,
|
|
|
|
// $SampleType:ty,
|
|
|
|
// $SampleTypeIdent:ident,
|
|
|
|
// $AsioType:ty,
|
|
|
|
// $AsioTypeIdent:ident,
|
|
|
|
// $Buffers:expr,
|
|
|
|
// $BuffersType:ty,
|
|
|
|
// $BuffersTypeIdent:ident,
|
|
|
|
// $Endianness:expr,
|
|
|
|
// $ConvertEndian:expr
|
|
|
|
// ) => {
|
|
|
|
// // For each channel write the asio buffer to
|
|
|
|
// // the cpal buffer
|
|
|
|
|
|
|
|
// for (i, channel) in $Buffers.channel.iter_mut().enumerate() {
|
|
|
|
// let buff_ptr = asio_stream.buffer_infos[i].buffers[index as usize]
|
|
|
|
// as *mut $AsioType;
|
|
|
|
// let asio_buffer: &'static [$AsioType] = std::slice::from_raw_parts(
|
|
|
|
// buff_ptr,
|
|
|
|
// asio_stream.buffer_size as usize,
|
|
|
|
// );
|
|
|
|
// for asio_s in asio_buffer.iter() {
|
|
|
|
// channel.push($ConvertEndian(
|
|
|
|
// convert_sample!(
|
|
|
|
// $AsioTypeIdent,
|
|
|
|
// $SampleType,
|
|
|
|
// $SampleTypeIdent,
|
|
|
|
// asio_s
|
|
|
|
// ),
|
|
|
|
// $Endianness,
|
|
|
|
// ));
|
|
|
|
// }
|
|
|
|
// }
|
|
|
|
|
|
|
|
// // interleave all the channels
|
|
|
|
// {
|
|
|
|
// let $BuffersTypeIdent {
|
|
|
|
// cpal: ref mut c_buffer,
|
|
|
|
// channel: ref mut channels,
|
|
|
|
// } = $Buffers;
|
|
|
|
// au::interleave(&channels, c_buffer);
|
|
|
|
// // Clear the per channel buffers
|
|
|
|
// for c in channels.iter_mut() {
|
|
|
|
// c.clear();
|
|
|
|
// }
|
|
|
|
// }
|
|
|
|
|
|
|
|
// // Call the users callback with the buffer
|
|
|
|
// callback(
|
|
|
|
// StreamId(count),
|
|
|
|
// Ok(StreamData::Input {
|
|
|
|
// buffer: UnknownTypeInputBuffer::$SampleFormat(::InputBuffer {
|
|
|
|
// buffer: &$Buffers.cpal,
|
|
|
|
// }),
|
|
|
|
// }),
|
|
|
|
// );
|
|
|
|
// };
|
|
|
|
// };
|
|
|
|
// // Call the right buffer handler depending on types
|
|
|
|
// match stream_type {
|
|
|
|
// sys::AsioSampleType::ASIOSTInt32LSB => {
|
|
|
|
// try_callback!(
|
|
|
|
// I16,
|
|
|
|
// i16,
|
|
|
|
// i16,
|
|
|
|
// i32,
|
|
|
|
// i32,
|
|
|
|
// buffers.i16_buff,
|
|
|
|
// I16Buffer,
|
|
|
|
// I16Buffer,
|
|
|
|
// Endian::Little,
|
|
|
|
// convert_endian_from
|
|
|
|
// );
|
|
|
|
// }
|
|
|
|
// sys::AsioSampleType::ASIOSTInt16LSB => {
|
|
|
|
// try_callback!(
|
|
|
|
// I16,
|
|
|
|
// i16,
|
|
|
|
// i16,
|
|
|
|
// i16,
|
|
|
|
// i16,
|
|
|
|
// buffers.i16_buff,
|
|
|
|
// I16Buffer,
|
|
|
|
// I16Buffer,
|
|
|
|
// Endian::Little,
|
|
|
|
// convert_endian_from
|
|
|
|
// );
|
|
|
|
// }
|
|
|
|
// sys::AsioSampleType::ASIOSTInt32MSB => {
|
|
|
|
// try_callback!(
|
|
|
|
// I16,
|
|
|
|
// i16,
|
|
|
|
// i16,
|
|
|
|
// i32,
|
|
|
|
// i32,
|
|
|
|
// buffers.i16_buff,
|
|
|
|
// I16Buffer,
|
|
|
|
// I16Buffer,
|
|
|
|
// Endian::Big,
|
|
|
|
// convert_endian_from
|
|
|
|
// );
|
|
|
|
// }
|
|
|
|
// sys::AsioSampleType::ASIOSTInt16MSB => {
|
|
|
|
// try_callback!(
|
|
|
|
// I16,
|
|
|
|
// i16,
|
|
|
|
// i16,
|
|
|
|
// i16,
|
|
|
|
// i16,
|
|
|
|
// buffers.i16_buff,
|
|
|
|
// I16Buffer,
|
|
|
|
// I16Buffer,
|
|
|
|
// Endian::Big,
|
|
|
|
// convert_endian_from
|
|
|
|
// );
|
|
|
|
// }
|
|
|
|
// sys::AsioSampleType::ASIOSTFloat32LSB => {
|
|
|
|
// try_callback!(
|
|
|
|
// F32,
|
|
|
|
// f32,
|
|
|
|
// f32,
|
|
|
|
// f32,
|
|
|
|
// f32,
|
|
|
|
// buffers.f32_buff,
|
|
|
|
// F32Buffer,
|
|
|
|
// F32Buffer,
|
|
|
|
// Endian::Little,
|
|
|
|
// |a, _| a
|
|
|
|
// );
|
|
|
|
// }
|
|
|
|
// sys::AsioSampleType::ASIOSTFloat64LSB => {
|
|
|
|
// try_callback!(
|
|
|
|
// F32,
|
|
|
|
// f32,
|
|
|
|
// f32,
|
|
|
|
// f64,
|
|
|
|
// f64,
|
|
|
|
// buffers.f32_buff,
|
|
|
|
// F32Buffer,
|
|
|
|
// F32Buffer,
|
|
|
|
// Endian::Little,
|
|
|
|
// |a, _| a
|
|
|
|
// );
|
|
|
|
// }
|
|
|
|
// sys::AsioSampleType::ASIOSTFloat32MSB => {
|
|
|
|
// try_callback!(
|
|
|
|
// F32,
|
|
|
|
// f32,
|
|
|
|
// f32,
|
|
|
|
// f32,
|
|
|
|
// f32,
|
|
|
|
// buffers.f32_buff,
|
|
|
|
// F32Buffer,
|
|
|
|
// F32Buffer,
|
|
|
|
// Endian::Big,
|
|
|
|
// |a, _| a
|
|
|
|
// );
|
|
|
|
// }
|
|
|
|
// sys::AsioSampleType::ASIOSTFloat64MSB => {
|
|
|
|
// try_callback!(
|
|
|
|
// F32,
|
|
|
|
// f32,
|
|
|
|
// f32,
|
|
|
|
// f64,
|
|
|
|
// f64,
|
|
|
|
// buffers.f32_buff,
|
|
|
|
// F32Buffer,
|
|
|
|
// F32Buffer,
|
|
|
|
// Endian::Big,
|
|
|
|
// |a, _| a
|
|
|
|
// );
|
|
|
|
// }
|
|
|
|
// _ => println!("unsupported format {:?}", stream_type),
|
|
|
|
// }
|
|
|
|
// });
|
|
|
|
// // Create stream and set to paused
|
|
|
|
// self.cpal_streams
|
|
|
|
// .lock()
|
|
|
|
// .unwrap()
|
|
|
|
// .push(Some(Stream { driver: driver.clone(), playing: false }));
|
|
|
|
|
|
|
|
// Ok(StreamId(count))
|
2018-10-12 05:54:26 +00:00
|
|
|
}
|
2018-10-29 11:57:42 +00:00
|
|
|
|
2018-11-05 01:41:15 +00:00
|
|
|
/// Create the an output cpal stream.
|
|
|
|
pub fn build_output_stream(
|
2018-11-07 07:38:33 +00:00
|
|
|
&self,
|
|
|
|
device: &Device,
|
|
|
|
format: &Format,
|
2019-06-26 14:24:23 +00:00
|
|
|
) -> Result<StreamId, BuildStreamError> {
|
2019-06-27 18:43:58 +00:00
|
|
|
let Device { driver, .. } = device;
|
2018-11-05 01:41:15 +00:00
|
|
|
let num_channels = format.channels.clone();
|
2019-06-27 18:43:58 +00:00
|
|
|
let stream_type = driver.data_type().map_err(build_stream_err)?;
|
|
|
|
let stream_buffer_size = self.get_output_stream(&driver, format, device)?;
|
2019-06-28 17:00:13 +00:00
|
|
|
let channel_len = stream_buffer_size as usize;
|
2019-06-27 18:43:58 +00:00
|
|
|
let cpal_num_samples = stream_buffer_size * num_channels as usize;
|
|
|
|
let count = self.stream_count.fetch_add(1, Ordering::SeqCst);
|
|
|
|
let asio_streams = self.asio_streams.clone();
|
|
|
|
let cpal_streams = self.cpal_streams.clone();
|
|
|
|
let callbacks = self.callbacks.clone();
|
2018-10-29 11:57:42 +00:00
|
|
|
|
2019-06-28 17:00:13 +00:00
|
|
|
// Create buffers depending on data type.
|
|
|
|
let stream_id = StreamId(count);
|
|
|
|
let data_type = format.data_type;
|
|
|
|
let len_bytes = cpal_num_samples * data_type.sample_size();
|
|
|
|
let mut interleaved = vec![0u8; len_bytes];
|
|
|
|
let mut silence_asio_buffer = SilenceAsioBuffer::default();
|
|
|
|
|
|
|
|
sys::set_callback(move |buffer_index| unsafe {
|
|
|
|
// If not playing, return early.
|
|
|
|
if let Some(s) = cpal_streams.lock().unwrap().get(count) {
|
|
|
|
if let Some(s) = s {
|
|
|
|
if !s.playing {
|
|
|
|
return ();
|
2018-11-05 01:41:15 +00:00
|
|
|
}
|
2018-11-07 08:26:39 +00:00
|
|
|
}
|
2019-06-27 18:43:58 +00:00
|
|
|
}
|
2019-06-28 17:00:13 +00:00
|
|
|
|
|
|
|
// Acquire the stream and callback.
|
2019-06-27 18:43:58 +00:00
|
|
|
let stream_lock = asio_streams.lock().unwrap();
|
|
|
|
let ref asio_stream = match stream_lock.output {
|
|
|
|
Some(ref asio_stream) => asio_stream,
|
|
|
|
None => return (),
|
|
|
|
};
|
|
|
|
let mut callbacks = callbacks.lock().unwrap();
|
|
|
|
let callback = match callbacks.as_mut() {
|
|
|
|
Some(callback) => callback,
|
|
|
|
None => return (),
|
|
|
|
};
|
2018-11-07 08:26:39 +00:00
|
|
|
|
2019-06-28 17:00:13 +00:00
|
|
|
// Silence the ASIO buffer that is about to be used.
|
|
|
|
//
|
|
|
|
// This checks if any other callbacks have already silenced the buffer associated with
|
|
|
|
// the current `buffer_index`.
|
|
|
|
//
|
|
|
|
// If not, we will silence it and set the opposite buffer half to unsilenced.
|
|
|
|
let silence = match buffer_index {
|
|
|
|
0 if !silence_asio_buffer.first => {
|
|
|
|
silence_asio_buffer.first = true;
|
|
|
|
silence_asio_buffer.second = false;
|
|
|
|
true
|
|
|
|
}
|
|
|
|
0 => false,
|
|
|
|
1 if !silence_asio_buffer.second => {
|
|
|
|
silence_asio_buffer.second = true;
|
|
|
|
silence_asio_buffer.first = false;
|
|
|
|
true
|
|
|
|
}
|
|
|
|
1 => false,
|
|
|
|
_ => unreachable!("ASIO uses a double-buffer so there should only be 2"),
|
2019-06-27 18:43:58 +00:00
|
|
|
};
|
2018-11-07 08:26:39 +00:00
|
|
|
|
2019-06-28 17:00:13 +00:00
|
|
|
/// 1. Render the given callback to the given buffer of interleaved samples.
|
|
|
|
/// 2. If required, silence the ASIO buffer.
|
|
|
|
/// 3. Finally, write the interleaved data to the non-interleaved ASIO buffer,
|
|
|
|
/// performing endianness conversions as necessary.
|
|
|
|
unsafe fn process_output_callback<A, B, F, G>(
|
|
|
|
stream_id: StreamId,
|
|
|
|
callback: &mut (dyn FnMut(StreamId, StreamDataResult) + Send),
|
|
|
|
interleaved: &mut [u8],
|
|
|
|
silence_asio_buffer: bool,
|
|
|
|
asio_stream: &sys::AsioStream,
|
|
|
|
buffer_index: usize,
|
|
|
|
to_asio_sample: F,
|
|
|
|
to_endianness: G,
|
|
|
|
)
|
|
|
|
where
|
|
|
|
A: InterleavedSample,
|
|
|
|
B: AsioSample,
|
|
|
|
F: Fn(A) -> B,
|
|
|
|
G: Fn(B) -> B,
|
|
|
|
{
|
|
|
|
// 1. Render interleaved buffer from callback.
|
|
|
|
let interleaved: &mut [A] = cast_slice_mut(interleaved);
|
|
|
|
callback(
|
|
|
|
stream_id,
|
|
|
|
Ok(StreamData::Output { buffer: A::unknown_type_output_buffer(interleaved) }),
|
|
|
|
);
|
|
|
|
|
|
|
|
// 2. Silence ASIO channels if necessary.
|
|
|
|
let n_channels = interleaved.len() / asio_stream.buffer_size as usize;
|
|
|
|
if silence_asio_buffer {
|
|
|
|
for ch_ix in 0..n_channels {
|
|
|
|
let asio_channel =
|
|
|
|
asio_channel_slice_mut::<B>(asio_stream, buffer_index, ch_ix);
|
|
|
|
asio_channel.iter_mut().for_each(|s| *s = to_endianness(B::SILENCE));
|
2019-06-27 18:43:58 +00:00
|
|
|
}
|
2019-06-28 17:00:13 +00:00
|
|
|
}
|
2018-11-02 11:06:08 +00:00
|
|
|
|
2019-06-28 17:00:13 +00:00
|
|
|
// 3. Write interleaved samples to ASIO channels, one channel at a time.
|
|
|
|
for ch_ix in 0..n_channels {
|
|
|
|
let asio_channel =
|
|
|
|
asio_channel_slice_mut::<B>(asio_stream, buffer_index, ch_ix);
|
|
|
|
for (frame, s_asio) in interleaved.chunks(n_channels).zip(asio_channel) {
|
|
|
|
*s_asio = *s_asio + to_endianness(to_asio_sample(frame[ch_ix]));
|
2018-11-07 08:26:39 +00:00
|
|
|
}
|
2019-06-27 18:43:58 +00:00
|
|
|
}
|
2019-06-28 17:00:13 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
match (data_type, &stream_type) {
|
|
|
|
(SampleFormat::I16, &sys::AsioSampleType::ASIOSTInt16LSB) => {
|
|
|
|
process_output_callback::<i16, i16, _, _>(
|
|
|
|
stream_id,
|
|
|
|
callback,
|
|
|
|
&mut interleaved,
|
|
|
|
silence,
|
|
|
|
asio_stream,
|
|
|
|
buffer_index as usize,
|
|
|
|
std::convert::identity::<i16>,
|
|
|
|
to_le,
|
2019-06-27 18:43:58 +00:00
|
|
|
);
|
|
|
|
}
|
2019-06-28 17:00:13 +00:00
|
|
|
(SampleFormat::I16, &sys::AsioSampleType::ASIOSTInt16MSB) => {
|
|
|
|
process_output_callback::<i16, i16, _, _>(
|
|
|
|
stream_id,
|
|
|
|
callback,
|
|
|
|
&mut interleaved,
|
|
|
|
silence,
|
|
|
|
asio_stream,
|
|
|
|
buffer_index as usize,
|
|
|
|
std::convert::identity::<i16>,
|
|
|
|
to_be,
|
2019-06-27 18:43:58 +00:00
|
|
|
);
|
|
|
|
}
|
2019-06-28 17:00:13 +00:00
|
|
|
|
|
|
|
// TODO: Handle endianness conversion for floats? We currently use the `PrimInt`
|
|
|
|
// trait for the `to_le` and `to_be` methods, but this does not support floats.
|
|
|
|
(SampleFormat::F32, &sys::AsioSampleType::ASIOSTFloat32LSB) |
|
|
|
|
(SampleFormat::F32, &sys::AsioSampleType::ASIOSTFloat32MSB) => {
|
|
|
|
process_output_callback::<f32, f32, _, _>(
|
|
|
|
stream_id,
|
|
|
|
callback,
|
|
|
|
&mut interleaved,
|
|
|
|
silence,
|
|
|
|
asio_stream,
|
|
|
|
buffer_index as usize,
|
|
|
|
std::convert::identity::<f32>,
|
|
|
|
std::convert::identity::<f32>,
|
2019-06-27 18:43:58 +00:00
|
|
|
);
|
|
|
|
}
|
2019-06-28 17:00:13 +00:00
|
|
|
|
|
|
|
// TODO: Add support for the following sample formats to CPAL and simplify the
|
|
|
|
// `process_output_callback` function above by removing the unnecessary sample
|
|
|
|
// conversion function.
|
|
|
|
(SampleFormat::I16, &sys::AsioSampleType::ASIOSTInt32LSB) => {
|
|
|
|
process_output_callback::<i16, i32, _, _>(
|
|
|
|
stream_id,
|
|
|
|
callback,
|
|
|
|
&mut interleaved,
|
|
|
|
silence,
|
|
|
|
asio_stream,
|
|
|
|
buffer_index as usize,
|
|
|
|
|s| (s as i32) << 16,
|
|
|
|
to_le,
|
2019-06-27 18:43:58 +00:00
|
|
|
);
|
2018-11-07 08:26:39 +00:00
|
|
|
}
|
2019-06-28 17:00:13 +00:00
|
|
|
(SampleFormat::I16, &sys::AsioSampleType::ASIOSTInt32MSB) => {
|
|
|
|
process_output_callback::<i16, i32, _, _>(
|
|
|
|
stream_id,
|
|
|
|
callback,
|
|
|
|
&mut interleaved,
|
|
|
|
silence,
|
|
|
|
asio_stream,
|
|
|
|
buffer_index as usize,
|
|
|
|
|s| (s as i32) << 16,
|
|
|
|
to_be,
|
2019-06-27 18:43:58 +00:00
|
|
|
);
|
|
|
|
}
|
2019-06-28 17:00:13 +00:00
|
|
|
// TODO: Handle endianness conversion for floats? We currently use the `PrimInt`
|
|
|
|
// trait for the `to_le` and `to_be` methods, but this does not support floats.
|
|
|
|
(SampleFormat::F32, &sys::AsioSampleType::ASIOSTFloat64LSB) |
|
|
|
|
(SampleFormat::F32, &sys::AsioSampleType::ASIOSTFloat64MSB) => {
|
|
|
|
process_output_callback::<f32, f64, _, _>(
|
|
|
|
stream_id,
|
|
|
|
callback,
|
|
|
|
&mut interleaved,
|
|
|
|
silence,
|
|
|
|
asio_stream,
|
|
|
|
buffer_index as usize,
|
|
|
|
|s| s as f64,
|
|
|
|
std::convert::identity::<f64>,
|
2019-06-27 18:43:58 +00:00
|
|
|
);
|
|
|
|
}
|
2019-06-28 17:00:13 +00:00
|
|
|
|
|
|
|
unsupported_format_pair => {
|
|
|
|
unreachable!("`build_output_stream` should have returned with unsupported \
|
|
|
|
format {:?}", unsupported_format_pair)
|
2019-06-27 18:43:58 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
});
|
2019-06-28 17:00:13 +00:00
|
|
|
|
2019-06-27 18:43:58 +00:00
|
|
|
// Create the stream paused
|
|
|
|
self.cpal_streams
|
|
|
|
.lock()
|
|
|
|
.unwrap()
|
|
|
|
.push(Some(Stream { driver: driver.clone(), playing: false }));
|
|
|
|
|
|
|
|
// Give the ID based on the stream count
|
|
|
|
Ok(StreamId(count))
|
2018-10-30 05:50:20 +00:00
|
|
|
}
|
2018-10-12 05:54:26 +00:00
|
|
|
|
2018-11-05 01:41:15 +00:00
|
|
|
/// Play the cpal stream for the given ID.
|
2019-06-26 14:24:23 +00:00
|
|
|
pub fn play_stream(&self, stream_id: StreamId) -> Result<(), PlayStreamError> {
|
2018-11-05 01:41:15 +00:00
|
|
|
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;
|
2019-06-27 18:43:58 +00:00
|
|
|
// Calling play when already playing is a no-op
|
|
|
|
s.driver.start().map_err(play_stream_err)?;
|
2018-11-05 01:41:15 +00:00
|
|
|
}
|
2019-06-27 11:49:27 +00:00
|
|
|
Ok(())
|
2018-10-30 05:50:20 +00:00
|
|
|
}
|
2018-11-05 01:41:15 +00:00
|
|
|
|
|
|
|
/// Pause the cpal stream for the given ID.
|
2019-06-27 18:43:58 +00:00
|
|
|
///
|
|
|
|
/// Pause the ASIO streams if there are no other CPAL streams playing, as ASIO only allows
|
|
|
|
/// stopping the entire driver.
|
2019-06-26 14:24:23 +00:00
|
|
|
pub fn pause_stream(&self, stream_id: StreamId) -> Result<(), PauseStreamError> {
|
2018-11-05 01:41:15 +00:00
|
|
|
let mut streams = self.cpal_streams.lock().unwrap();
|
2019-06-27 18:43:58 +00:00
|
|
|
let streams_playing = streams.iter()
|
2019-06-28 17:00:13 +00:00
|
|
|
.filter(|s| s.as_ref().map(|s| s.playing).unwrap_or(false))
|
2019-06-27 18:43:58 +00:00
|
|
|
.count();
|
|
|
|
if let Some(s) = streams.get_mut(stream_id.0).expect("Bad pause stream index") {
|
|
|
|
if streams_playing <= 1 {
|
|
|
|
s.driver.stop().map_err(pause_stream_err)?;
|
|
|
|
}
|
2019-06-28 17:00:13 +00:00
|
|
|
s.playing = false;
|
2018-11-05 01:41:15 +00:00
|
|
|
}
|
2019-06-27 11:49:27 +00:00
|
|
|
Ok(())
|
2018-10-30 05:50:20 +00:00
|
|
|
}
|
2018-10-29 11:57:42 +00:00
|
|
|
|
2018-11-05 01:41:15 +00:00
|
|
|
/// Destroy the cpal stream based on the ID.
|
|
|
|
pub fn destroy_stream(&self, stream_id: StreamId) {
|
2019-06-27 18:43:58 +00:00
|
|
|
// TODO: Should we not also remove an ASIO stream here?
|
2018-11-05 01:41:15 +00:00
|
|
|
let mut streams = self.cpal_streams.lock().unwrap();
|
|
|
|
streams.get_mut(stream_id.0).take();
|
2018-10-12 05:54:26 +00:00
|
|
|
}
|
2018-10-30 03:27:50 +00:00
|
|
|
|
2018-11-05 01:41:15 +00:00
|
|
|
/// Run the cpal callbacks
|
|
|
|
pub fn run<F>(&self, mut callback: F) -> !
|
|
|
|
where
|
2019-06-26 14:24:23 +00:00
|
|
|
F: FnMut(StreamId, StreamDataResult) + Send,
|
2018-11-05 01:41:15 +00:00
|
|
|
{
|
2019-06-26 14:24:23 +00:00
|
|
|
let callback: &mut (FnMut(StreamId, StreamDataResult) + Send) = &mut callback;
|
2018-11-07 07:38:33 +00:00
|
|
|
// Transmute needed to convince the compiler that the callback has a static lifetime
|
2018-11-07 08:26:39 +00:00
|
|
|
*self.callbacks.lock().unwrap() = Some(unsafe { mem::transmute(callback) });
|
2018-11-05 01:41:15 +00:00
|
|
|
loop {
|
2018-11-07 03:59:38 +00:00
|
|
|
// A sleep here to prevent the loop being
|
2018-11-05 01:41:15 +00:00
|
|
|
// removed in --release
|
2018-11-07 03:59:38 +00:00
|
|
|
thread::sleep(Duration::new(1u64, 0u32));
|
2018-11-05 01:41:15 +00:00
|
|
|
}
|
2018-10-12 05:54:26 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2018-11-05 01:41:15 +00:00
|
|
|
/// Clean up if event loop is dropped.
|
|
|
|
/// Currently event loop is never dropped.
|
2018-10-30 03:27:50 +00:00
|
|
|
impl Drop for EventLoop {
|
|
|
|
fn drop(&mut self) {
|
2018-11-07 08:26:39 +00:00
|
|
|
*self.asio_streams.lock().unwrap() = sys::AsioStreams {
|
|
|
|
output: None,
|
|
|
|
input: None,
|
|
|
|
};
|
2018-10-30 03:27:50 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-06-28 17:00:13 +00:00
|
|
|
impl Silence for i16 {
|
|
|
|
const SILENCE: Self = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Silence for i32 {
|
|
|
|
const SILENCE: Self = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Silence for f32 {
|
|
|
|
const SILENCE: Self = 0.0;
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Silence for f64 {
|
|
|
|
const SILENCE: Self = 0.0;
|
|
|
|
}
|
|
|
|
|
|
|
|
impl InterleavedSample for i16 {
|
|
|
|
fn unknown_type_output_buffer(buffer: &mut [Self]) -> UnknownTypeOutputBuffer {
|
|
|
|
UnknownTypeOutputBuffer::I16(::OutputBuffer { buffer })
|
2018-11-01 06:58:50 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-06-28 17:00:13 +00:00
|
|
|
impl InterleavedSample for f32 {
|
|
|
|
fn unknown_type_output_buffer(buffer: &mut [Self]) -> UnknownTypeOutputBuffer {
|
|
|
|
UnknownTypeOutputBuffer::F32(::OutputBuffer { buffer })
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl AsioSample for i16 {}
|
|
|
|
|
|
|
|
impl AsioSample for i32 {}
|
|
|
|
|
|
|
|
impl AsioSample for f32 {}
|
|
|
|
|
|
|
|
impl AsioSample for f64 {}
|
|
|
|
|
|
|
|
/// Cast a byte slice into a (immutable) slice of desired type.
|
|
|
|
///
|
|
|
|
/// Safety: it's up to the caller to ensure that the input slice has valid bit representations.
|
|
|
|
unsafe fn cast_slice<T>(v: &[u8]) -> &[T] {
|
|
|
|
debug_assert!(v.len() % std::mem::size_of::<T>() == 0);
|
|
|
|
std::slice::from_raw_parts(v.as_ptr() as *const T, v.len() / std::mem::size_of::<T>())
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Cast a byte slice into a mutable slice of desired type.
|
|
|
|
///
|
|
|
|
/// Safety: it's up to the caller to ensure that the input slice has valid bit representations.
|
|
|
|
unsafe fn cast_slice_mut<T>(v: &mut [u8]) -> &mut [T] {
|
|
|
|
debug_assert!(v.len() % std::mem::size_of::<T>() == 0);
|
|
|
|
std::slice::from_raw_parts_mut(v.as_mut_ptr() as *mut T, v.len() / std::mem::size_of::<T>())
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Helper function to convert to system endianness
|
|
|
|
fn to_le<T: PrimInt>(t: T) -> T {
|
|
|
|
t.to_le()
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Helper function to convert from system endianness
|
|
|
|
fn to_be<T: PrimInt>(t: T) -> T {
|
|
|
|
t.to_be()
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Shorthand for retrieving the asio buffer slice associated with a channel.
|
|
|
|
///
|
|
|
|
/// Safety: it's up to the user to ensure the slice is not used beyond the lifetime of
|
|
|
|
/// the stream and that this function is not called multiple times for the same
|
|
|
|
/// channel.
|
|
|
|
unsafe fn asio_channel_slice_mut<T>(
|
|
|
|
asio_stream: &sys::AsioStream,
|
|
|
|
buffer_index: usize,
|
|
|
|
channel_index: usize,
|
|
|
|
) -> &mut [T] {
|
|
|
|
let buff_ptr: *mut T = asio_stream
|
|
|
|
.buffer_infos[channel_index]
|
|
|
|
.buffers[buffer_index as usize]
|
|
|
|
as *mut _;
|
|
|
|
std::slice::from_raw_parts_mut(buff_ptr, asio_stream.buffer_size as usize)
|
|
|
|
}
|
|
|
|
|
2018-11-05 01:41:15 +00:00
|
|
|
/// Helper function to convert from system endianness
|
2018-11-01 06:58:50 +00:00
|
|
|
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),
|
|
|
|
}
|
2018-11-05 01:41:15 +00:00
|
|
|
}
|
2019-06-27 18:43:58 +00:00
|
|
|
|
|
|
|
fn build_stream_err(e: sys::AsioError) -> BuildStreamError {
|
|
|
|
match e {
|
|
|
|
sys::AsioError::NoDrivers |
|
|
|
|
sys::AsioError::HardwareMalfunction => BuildStreamError::DeviceNotAvailable,
|
|
|
|
sys::AsioError::InvalidInput |
|
|
|
|
sys::AsioError::BadMode => BuildStreamError::InvalidArgument,
|
|
|
|
err => {
|
|
|
|
let description = format!("{}", err);
|
|
|
|
BackendSpecificError { description }.into()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn pause_stream_err(e: sys::AsioError) -> PauseStreamError {
|
|
|
|
match e {
|
|
|
|
sys::AsioError::NoDrivers |
|
|
|
|
sys::AsioError::HardwareMalfunction => PauseStreamError::DeviceNotAvailable,
|
|
|
|
err => {
|
|
|
|
let description = format!("{}", err);
|
|
|
|
BackendSpecificError { description }.into()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
fn play_stream_err(e: sys::AsioError) -> PlayStreamError {
|
|
|
|
match e {
|
|
|
|
sys::AsioError::NoDrivers |
|
|
|
|
sys::AsioError::HardwareMalfunction => PlayStreamError::DeviceNotAvailable,
|
|
|
|
err => {
|
|
|
|
let description = format!("{}", err);
|
|
|
|
BackendSpecificError { description }.into()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|