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use crate::decoder;
use crate::dynamic_mixer::{self, DynamicMixerController};
use crate::sink::Sink;
use crate::source::Source;
use cpal::{
traits::{DeviceTrait, HostTrait, StreamTrait},
Sample,
};
use std::io::{Read, Seek};
use std::sync::{Arc, Weak};
use std::{error, fmt};
pub struct OutputStream {
mixer: Arc<DynamicMixerController<f32>>,
_stream: cpal::Stream,
}
#[derive(Clone)]
pub struct OutputStreamHandle {
mixer: Weak<DynamicMixerController<f32>>,
}
impl OutputStream {
pub fn try_from_device(
device: &cpal::Device,
) -> Result<(Self, OutputStreamHandle), StreamError> {
let (mixer, _stream) = device.new_output_stream();
_stream.play()?;
let out = Self { mixer, _stream };
let handle = OutputStreamHandle {
mixer: Arc::downgrade(&out.mixer),
};
Ok((out, handle))
}
pub fn try_default() -> Result<(Self, OutputStreamHandle), StreamError> {
let device = cpal::default_host()
.default_output_device()
.ok_or(StreamError::NoDevice)?;
Self::try_from_device(&device)
}
}
impl OutputStreamHandle {
pub fn play_raw<S>(&self, source: S) -> Result<(), PlayError>
where
S: Source<Item = f32> + Send + 'static,
{
let mixer = self.mixer.upgrade().ok_or(PlayError::NoDevice)?;
mixer.add(source);
Ok(())
}
pub fn play_once<R>(&self, input: R) -> Result<Sink, PlayError>
where
R: Read + Seek + Send + 'static,
{
let input = decoder::Decoder::new(input)?;
let sink = Sink::try_new(self)?;
sink.append(input);
Ok(sink)
}
}
#[derive(Debug)]
pub enum PlayError {
DecoderError(decoder::DecoderError),
NoDevice,
}
impl From<decoder::DecoderError> for PlayError {
fn from(err: decoder::DecoderError) -> Self {
Self::DecoderError(err)
}
}
impl fmt::Display for PlayError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Self::DecoderError(e) => e.fmt(f),
Self::NoDevice => write!(f, "NoDevice"),
}
}
}
impl error::Error for PlayError {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match self {
Self::DecoderError(e) => Some(e),
Self::NoDevice => None,
}
}
}
#[derive(Debug)]
pub enum StreamError {
PlayStreamError(cpal::PlayStreamError),
NoDevice,
}
impl From<cpal::PlayStreamError> for StreamError {
fn from(err: cpal::PlayStreamError) -> Self {
Self::PlayStreamError(err)
}
}
impl fmt::Display for StreamError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Self::PlayStreamError(e) => e.fmt(f),
Self::NoDevice => write!(f, "NoDevice"),
}
}
}
impl error::Error for StreamError {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match self {
Self::PlayStreamError(e) => Some(e),
Self::NoDevice => None,
}
}
}
pub(crate) trait CpalDeviceExt {
fn new_output_stream_with_format(
&self,
format: cpal::SupportedStreamConfig,
) -> Result<(Arc<DynamicMixerController<f32>>, cpal::Stream), cpal::BuildStreamError>;
fn new_output_stream(&self) -> (Arc<DynamicMixerController<f32>>, cpal::Stream);
}
impl CpalDeviceExt for cpal::Device {
fn new_output_stream_with_format(
&self,
format: cpal::SupportedStreamConfig,
) -> Result<(Arc<DynamicMixerController<f32>>, cpal::Stream), cpal::BuildStreamError> {
let (mixer_tx, mut mixer_rx) =
dynamic_mixer::mixer::<f32>(format.channels(), format.sample_rate().0);
let error_callback = |err| eprintln!("an error occurred on output stream: {}", err);
match format.sample_format() {
cpal::SampleFormat::F32 => self.build_output_stream::<f32, _, _>(
&format.config(),
move |data, _| {
data.iter_mut()
.for_each(|d| *d = mixer_rx.next().unwrap_or(0f32))
},
error_callback,
),
cpal::SampleFormat::I16 => self.build_output_stream::<i16, _, _>(
&format.config(),
move |data, _| {
data.iter_mut()
.for_each(|d| *d = mixer_rx.next().map(|s| s.to_i16()).unwrap_or(0i16))
},
error_callback,
),
cpal::SampleFormat::U16 => self.build_output_stream::<u16, _, _>(
&format.config(),
move |data, _| {
data.iter_mut().for_each(|d| {
*d = mixer_rx
.next()
.map(|s| s.to_u16())
.unwrap_or(u16::max_value() / 2)
})
},
error_callback,
),
}
.map(|stream| (mixer_tx, stream))
}
fn new_output_stream(&self) -> (Arc<DynamicMixerController<f32>>, cpal::Stream) {
let default_format = self
.default_output_config()
.expect("The device doesn't support any format!?");
self.new_output_stream_with_format(default_format)
.unwrap_or_else(|err| {
supported_output_formats(self)
.filter_map(|format| self.new_output_stream_with_format(format).ok())
.next()
.ok_or(err)
.expect("build_output_stream failed with all supported formats")
})
}
}
fn supported_output_formats(
device: &cpal::Device,
) -> impl Iterator<Item = cpal::SupportedStreamConfig> {
const HZ_44100: cpal::SampleRate = cpal::SampleRate(44_100);
let mut supported: Vec<_> = device
.supported_output_configs()
.expect("No supported output formats")
.collect();
supported.sort_by(|a, b| b.cmp_default_heuristics(a));
supported.into_iter().flat_map(|sf| {
let max_rate = sf.max_sample_rate();
let min_rate = sf.min_sample_rate();
let mut formats = vec![sf.clone().with_max_sample_rate()];
if HZ_44100 < max_rate && HZ_44100 > min_rate {
formats.push(sf.clone().with_sample_rate(HZ_44100))
}
formats.push(sf.with_sample_rate(min_rate));
formats
})
}