mirror of
https://github.com/RustAudio/rodio
synced 2024-12-14 22:22:44 +00:00
Dispatch source.rs between various submodules
This commit is contained in:
Pierre Krieger
parent
1f3eefd863
commit
c67362a999
4 changed files with 299 additions and 280 deletions
280
src/source.rs
280
src/source.rs
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@ -1,280 +0,0 @@
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use std::cmp;
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use std::time::Duration;
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use std::mem;
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use cpal;
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use conversions::DataConverter;
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use conversions::SamplesRateConverter;
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use conversions::ChannelsCountConverter;
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use Sample;
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/// A source of samples.
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pub trait Source: Iterator where Self::Item: Sample {
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/// Returns the number of samples before the current channel ends. `None` means "infinite".
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/// Should never return 0 unless there's no more data.
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///
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/// After the engine has finished reading the specified number of samples, it will assume that
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/// the value of `get_channels()` and/or `get_samples_rate()` have changed.
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fn get_current_frame_len(&self) -> Option<usize>;
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/// Returns the number of channels. Channels are always interleaved.
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fn get_channels(&self) -> u16;
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/// Returns the rate at which the source should be played.
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fn get_samples_rate(&self) -> u32;
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/// Returns the total duration of this source, if known.
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///
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/// `None` indicates at the same time "infinite" or "unknown".
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fn get_total_duration(&self) -> Option<Duration>;
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/// Repeats this source forever.
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///
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/// Note that this works by storing the data in a buffer, so the amount of memory used is
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/// proportional to the size of the sound.
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#[inline]
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fn repeat_infinite(self) -> Repeat<Self> where Self: Sized {
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let buffer = vec![(Vec::new(), self.get_samples_rate(), self.get_channels())];
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Repeat { inner: RepeatImpl::FirstPass(self, buffer) }
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}
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}
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/// An iterator that reads from a `Source` and converts the samples to a specific rate and
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/// channels count.
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///
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/// It implements `Source` as well, but all the data is guaranteed to be in a single frame whose
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/// channels and samples rate have been passed to `new`.
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pub struct UniformSourceIterator<I, D> where I: Source, I::Item: Sample, D: Sample {
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inner: Option<DataConverter<ChannelsCountConverter<SamplesRateConverter<Take<I>>>, D>>,
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target_channels: u16,
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target_samples_rate: u32,
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}
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impl<I, D> UniformSourceIterator<I, D> where I: Source, I::Item: Sample, D: Sample {
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#[inline]
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pub fn new(input: I, target_channels: u16, target_samples_rate: u32)
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-> UniformSourceIterator<I, D>
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{
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let input = UniformSourceIterator::bootstrap(input, target_channels, target_samples_rate);
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UniformSourceIterator {
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inner: Some(input),
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target_channels: target_channels,
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target_samples_rate: target_samples_rate,
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}
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}
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#[inline]
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fn bootstrap(input: I, target_channels: u16, target_samples_rate: u32)
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-> DataConverter<ChannelsCountConverter<SamplesRateConverter<Take<I>>>, D>
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{
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let frame_len = input.get_current_frame_len();
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let from_channels = input.get_channels();
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let from_samples_rate = input.get_samples_rate();
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let input = Take { iter: input, n: frame_len };
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let input = SamplesRateConverter::new(input, cpal::SamplesRate(from_samples_rate),
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cpal::SamplesRate(target_samples_rate),
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from_channels);
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let input = ChannelsCountConverter::new(input, from_channels, target_channels);
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let input = DataConverter::new(input);
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input
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}
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}
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impl<I, D> Iterator for UniformSourceIterator<I, D> where I: Source, I::Item: Sample, D: Sample {
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type Item = D;
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#[inline]
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fn next(&mut self) -> Option<D> {
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if let Some(value) = self.inner.as_mut().unwrap().next() {
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return Some(value);
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}
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let input = self.inner.take().unwrap().into_inner().into_inner().into_inner().iter;
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let mut input = UniformSourceIterator::bootstrap(input, self.target_channels,
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self.target_samples_rate);
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let value = input.next();
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self.inner = Some(input);
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value
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}
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#[inline]
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fn size_hint(&self) -> (usize, Option<usize>) {
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(self.inner.as_ref().unwrap().size_hint().0, None)
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}
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}
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impl<I, D> Source for UniformSourceIterator<I, D> where I: Iterator + Source, I::Item: Sample,
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D: Sample
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{
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#[inline]
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fn get_current_frame_len(&self) -> Option<usize> {
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None
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}
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#[inline]
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fn get_channels(&self) -> u16 {
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self.target_channels
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}
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#[inline]
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fn get_samples_rate(&self) -> u32 {
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self.target_samples_rate
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}
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#[inline]
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fn get_total_duration(&self) -> Option<Duration> {
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None
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}
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}
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struct Take<I> {
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iter: I,
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n: Option<usize>,
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}
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impl<I> Iterator for Take<I> where I: Iterator {
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type Item = <I as Iterator>::Item;
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#[inline]
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fn next(&mut self) -> Option<<I as Iterator>::Item> {
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if let Some(ref mut n) = self.n {
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if *n != 0 {
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*n -= 1;
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self.iter.next()
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} else {
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None
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}
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} else {
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self.iter.next()
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}
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}
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#[inline]
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fn size_hint(&self) -> (usize, Option<usize>) {
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if let Some(n) = self.n {
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let (lower, upper) = self.iter.size_hint();
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let lower = cmp::min(lower, n);
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let upper = match upper {
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Some(x) if x < n => Some(x),
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_ => Some(n)
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};
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(lower, upper)
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} else {
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self.iter.size_hint()
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}
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}
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}
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impl<I> ExactSizeIterator for Take<I> where I: ExactSizeIterator {
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}
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/// A source that repeats the given source.
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pub struct Repeat<I> where I: Source, I::Item: Sample {
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inner: RepeatImpl<I>,
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}
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enum RepeatImpl<I> where I: Source, I::Item: Sample {
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FirstPass(I, Vec<(Vec<I::Item>, u32, u16)>),
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NextPasses(Vec<(Vec<I::Item>, u32, u16)>, usize, usize)
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}
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impl<I> Iterator for Repeat<I> where I: Source, I::Item: Sample {
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type Item = <I as Iterator>::Item;
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#[inline]
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fn next(&mut self) -> Option<<I as Iterator>::Item> {
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match self.inner {
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RepeatImpl::FirstPass(ref mut input, ref mut buffer) => {
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match input.get_current_frame_len() {
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Some(1) => {
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if let Some(sample) = input.next() {
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buffer.last_mut().unwrap().0.push(sample);
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buffer.push((Vec::new(), input.get_samples_rate(), input.get_channels()));
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return Some(sample);
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}
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},
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Some(0) => {
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},
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_ => {
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if let Some(sample) = input.next() {
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buffer.last_mut().unwrap().0.push(sample);
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return Some(sample);
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}
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},
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}
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},
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RepeatImpl::NextPasses(ref buffer, ref mut off1, ref mut off2) => {
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let sample = buffer[*off1].0[*off2];
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*off2 += 1;
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if *off2 >= buffer[*off1].0.len() {
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*off1 += 1;
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*off2 = 0;
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}
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if *off1 >= buffer.len() {
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*off1 = 0;
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}
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return Some(sample);
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},
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}
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// if we reach this, we need to switch from FirstPass to NextPasses
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let buffer = if let RepeatImpl::FirstPass(_, ref mut buffer) = self.inner {
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mem::replace(buffer, Vec::new())
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} else {
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unreachable!()
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};
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mem::replace(&mut self.inner, RepeatImpl::NextPasses(buffer, 0, 0));
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self.next()
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}
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// TODO: size_hint
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}
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impl<I> Source for Repeat<I> where I: Iterator + Source, I::Item: Sample {
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#[inline]
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fn get_current_frame_len(&self) -> Option<usize> {
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match self.inner {
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RepeatImpl::FirstPass(ref input, _) => input.get_current_frame_len(),
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RepeatImpl::NextPasses(ref buffers, off1, off2) => Some(buffers[off1].0.len() - off2),
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}
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}
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#[inline]
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fn get_channels(&self) -> u16 {
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match self.inner {
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RepeatImpl::FirstPass(ref input, _) => input.get_channels(),
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RepeatImpl::NextPasses(ref buffers, off1, _) => buffers[off1].2,
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}
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}
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#[inline]
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fn get_samples_rate(&self) -> u32 {
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match self.inner {
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RepeatImpl::FirstPass(ref input, _) => input.get_samples_rate(),
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RepeatImpl::NextPasses(ref buffers, off1, _) => buffers[off1].1,
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}
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}
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#[inline]
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fn get_total_duration(&self) -> Option<Duration> {
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// TODO: ?
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None
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}
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}
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39
src/source/mod.rs
Normal file
39
src/source/mod.rs
Normal file
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@ -0,0 +1,39 @@
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use std::time::Duration;
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use Sample;
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pub use self::repeat::Repeat;
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pub use self::uniform::UniformSourceIterator;
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mod repeat;
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mod uniform;
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/// A source of samples.
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pub trait Source: Iterator where Self::Item: Sample {
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/// Returns the number of samples before the current channel ends. `None` means "infinite".
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/// Should never return 0 unless there's no more data.
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///
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/// After the engine has finished reading the specified number of samples, it will assume that
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/// the value of `get_channels()` and/or `get_samples_rate()` have changed.
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fn get_current_frame_len(&self) -> Option<usize>;
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/// Returns the number of channels. Channels are always interleaved.
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fn get_channels(&self) -> u16;
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/// Returns the rate at which the source should be played.
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fn get_samples_rate(&self) -> u32;
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/// Returns the total duration of this source, if known.
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///
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/// `None` indicates at the same time "infinite" or "unknown".
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fn get_total_duration(&self) -> Option<Duration>;
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/// Repeats this source forever.
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///
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/// Note that this works by storing the data in a buffer, so the amount of memory used is
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/// proportional to the size of the sound.
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#[inline]
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fn repeat_infinite(self) -> Repeat<Self> where Self: Sized {
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repeat::repeat(self)
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}
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}
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110
src/source/repeat.rs
Normal file
110
src/source/repeat.rs
Normal file
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@ -0,0 +1,110 @@
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use std::time::Duration;
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use std::mem;
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use Sample;
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use Source;
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/// Internal function that builds a `Repeat` object.
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pub fn repeat<I>(input: I) -> Repeat<I> where I: Source, I::Item: Sample {
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let buffer = vec![(Vec::new(), input.get_samples_rate(), input.get_channels())];
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Repeat { inner: RepeatImpl::FirstPass(input, buffer) }
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}
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/// A source that repeats the given source.
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pub struct Repeat<I> where I: Source, I::Item: Sample {
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inner: RepeatImpl<I>,
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}
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enum RepeatImpl<I> where I: Source, I::Item: Sample {
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FirstPass(I, Vec<(Vec<I::Item>, u32, u16)>),
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NextPasses(Vec<(Vec<I::Item>, u32, u16)>, usize, usize)
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}
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impl<I> Iterator for Repeat<I> where I: Source, I::Item: Sample {
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type Item = <I as Iterator>::Item;
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#[inline]
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fn next(&mut self) -> Option<<I as Iterator>::Item> {
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match self.inner {
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RepeatImpl::FirstPass(ref mut input, ref mut buffer) => {
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match input.get_current_frame_len() {
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Some(1) => {
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if let Some(sample) = input.next() {
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buffer.last_mut().unwrap().0.push(sample);
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buffer.push((Vec::new(), input.get_samples_rate(), input.get_channels()));
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return Some(sample);
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}
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},
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Some(0) => {
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},
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_ => {
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if let Some(sample) = input.next() {
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buffer.last_mut().unwrap().0.push(sample);
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return Some(sample);
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}
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},
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}
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},
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RepeatImpl::NextPasses(ref buffer, ref mut off1, ref mut off2) => {
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let sample = buffer[*off1].0[*off2];
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*off2 += 1;
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if *off2 >= buffer[*off1].0.len() {
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*off1 += 1;
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*off2 = 0;
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}
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if *off1 >= buffer.len() {
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*off1 = 0;
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}
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return Some(sample);
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},
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}
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// if we reach this, we need to switch from FirstPass to NextPasses
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let buffer = if let RepeatImpl::FirstPass(_, ref mut buffer) = self.inner {
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mem::replace(buffer, Vec::new())
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} else {
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unreachable!()
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};
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mem::replace(&mut self.inner, RepeatImpl::NextPasses(buffer, 0, 0));
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self.next()
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}
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// TODO: size_hint
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}
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impl<I> Source for Repeat<I> where I: Iterator + Source, I::Item: Sample {
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#[inline]
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fn get_current_frame_len(&self) -> Option<usize> {
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match self.inner {
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RepeatImpl::FirstPass(ref input, _) => input.get_current_frame_len(),
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RepeatImpl::NextPasses(ref buffers, off1, off2) => Some(buffers[off1].0.len() - off2),
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}
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}
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#[inline]
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fn get_channels(&self) -> u16 {
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match self.inner {
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RepeatImpl::FirstPass(ref input, _) => input.get_channels(),
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RepeatImpl::NextPasses(ref buffers, off1, _) => buffers[off1].2,
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}
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}
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#[inline]
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fn get_samples_rate(&self) -> u32 {
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match self.inner {
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RepeatImpl::FirstPass(ref input, _) => input.get_samples_rate(),
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RepeatImpl::NextPasses(ref buffers, off1, _) => buffers[off1].1,
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}
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}
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#[inline]
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fn get_total_duration(&self) -> Option<Duration> {
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// TODO: ?
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None
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}
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}
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150
src/source/uniform.rs
Normal file
150
src/source/uniform.rs
Normal file
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@ -0,0 +1,150 @@
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use std::cmp;
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use std::time::Duration;
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|
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use cpal;
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|
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use conversions::DataConverter;
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use conversions::SamplesRateConverter;
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use conversions::ChannelsCountConverter;
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|
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use Sample;
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use Source;
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|
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/// An iterator that reads from a `Source` and converts the samples to a specific rate and
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/// channels count.
|
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///
|
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/// It implements `Source` as well, but all the data is guaranteed to be in a single frame whose
|
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/// channels and samples rate have been passed to `new`.
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pub struct UniformSourceIterator<I, D> where I: Source, I::Item: Sample, D: Sample {
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inner: Option<DataConverter<ChannelsCountConverter<SamplesRateConverter<Take<I>>>, D>>,
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target_channels: u16,
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target_samples_rate: u32,
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}
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impl<I, D> UniformSourceIterator<I, D> where I: Source, I::Item: Sample, D: Sample {
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#[inline]
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pub fn new(input: I, target_channels: u16, target_samples_rate: u32)
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-> UniformSourceIterator<I, D>
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{
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let input = UniformSourceIterator::bootstrap(input, target_channels, target_samples_rate);
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|
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UniformSourceIterator {
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inner: Some(input),
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target_channels: target_channels,
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target_samples_rate: target_samples_rate,
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}
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}
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#[inline]
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fn bootstrap(input: I, target_channels: u16, target_samples_rate: u32)
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-> DataConverter<ChannelsCountConverter<SamplesRateConverter<Take<I>>>, D>
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{
|
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let frame_len = input.get_current_frame_len();
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let from_channels = input.get_channels();
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let from_samples_rate = input.get_samples_rate();
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let input = Take { iter: input, n: frame_len };
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let input = SamplesRateConverter::new(input, cpal::SamplesRate(from_samples_rate),
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cpal::SamplesRate(target_samples_rate),
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from_channels);
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let input = ChannelsCountConverter::new(input, from_channels, target_channels);
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let input = DataConverter::new(input);
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input
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}
|
||||
}
|
||||
|
||||
impl<I, D> Iterator for UniformSourceIterator<I, D> where I: Source, I::Item: Sample, D: Sample {
|
||||
type Item = D;
|
||||
|
||||
#[inline]
|
||||
fn next(&mut self) -> Option<D> {
|
||||
if let Some(value) = self.inner.as_mut().unwrap().next() {
|
||||
return Some(value);
|
||||
}
|
||||
|
||||
let input = self.inner.take().unwrap().into_inner().into_inner().into_inner().iter;
|
||||
let mut input = UniformSourceIterator::bootstrap(input, self.target_channels,
|
||||
self.target_samples_rate);
|
||||
|
||||
let value = input.next();
|
||||
self.inner = Some(input);
|
||||
value
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn size_hint(&self) -> (usize, Option<usize>) {
|
||||
(self.inner.as_ref().unwrap().size_hint().0, None)
|
||||
}
|
||||
}
|
||||
|
||||
impl<I, D> Source for UniformSourceIterator<I, D> where I: Iterator + Source, I::Item: Sample,
|
||||
D: Sample
|
||||
{
|
||||
#[inline]
|
||||
fn get_current_frame_len(&self) -> Option<usize> {
|
||||
None
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn get_channels(&self) -> u16 {
|
||||
self.target_channels
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn get_samples_rate(&self) -> u32 {
|
||||
self.target_samples_rate
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn get_total_duration(&self) -> Option<Duration> {
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
struct Take<I> {
|
||||
iter: I,
|
||||
n: Option<usize>,
|
||||
}
|
||||
|
||||
impl<I> Iterator for Take<I> where I: Iterator {
|
||||
type Item = <I as Iterator>::Item;
|
||||
|
||||
#[inline]
|
||||
fn next(&mut self) -> Option<<I as Iterator>::Item> {
|
||||
if let Some(ref mut n) = self.n {
|
||||
if *n != 0 {
|
||||
*n -= 1;
|
||||
self.iter.next()
|
||||
} else {
|
||||
None
|
||||
}
|
||||
|
||||
} else {
|
||||
self.iter.next()
|
||||
}
|
||||
}
|
||||
|
||||
#[inline]
|
||||
fn size_hint(&self) -> (usize, Option<usize>) {
|
||||
if let Some(n) = self.n {
|
||||
let (lower, upper) = self.iter.size_hint();
|
||||
|
||||
let lower = cmp::min(lower, n);
|
||||
|
||||
let upper = match upper {
|
||||
Some(x) if x < n => Some(x),
|
||||
_ => Some(n)
|
||||
};
|
||||
|
||||
(lower, upper)
|
||||
|
||||
} else {
|
||||
self.iter.size_hint()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<I> ExactSizeIterator for Take<I> where I: ExactSizeIterator {
|
||||
}
|
||||
Loading…
Reference in a new issue