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//! A channel buffer as created through [Buf::channel][crate::Buf::channel] or //! [BufMut::channel_mut][crate::BufMut::channel_mut]. use crate::translate::Translate; use std::ops; mod iter; pub use self::iter::{Iter, IterMut}; /// Used to determine how a buffer is indexed. #[derive(Debug, Clone, Copy)] enum Kind { /// Returned channel buffer is indexed in a linear manner. Linear, /// Returned channel buffer is indexed in an interleaved manner. Interleaved { /// The number of channels in the interleaved buffer. channels: usize, /// The channel that is being accessed. channel: usize, }, } /// The buffer of a single channel. /// /// This doesn't provide direct access to the underlying buffer, but rather /// allows us to copy data usinga number of utility functions. #[derive(Debug, Clone, Copy)] pub struct Channel<'a, T> { buf: &'a [T], kind: Kind, } impl<'a, T> Channel<'a, T> { /// Construct a linear channel buffer. /// /// The buffer provided as-is constitutes the frames of the channel. /// /// # Examples /// /// ```rust /// use rotary::Channel; /// /// let buf = &mut [1, 3, 5, 7]; /// let channel = Channel::linear(buf); /// /// assert_eq!(channel[1], 3); /// assert_eq!(channel[2], 5); /// ``` pub fn linear(buf: &'a [T]) -> Self { Self { buf, kind: Kind::Linear, } } /// Construct an interleaved channel buffer. /// /// The provided buffer must be the complete buffer, which includes *all* /// other channels. The provided `channels` argument is the total number of /// channels in this buffer, and `channel` indicates which specific channel /// this buffer belongs to. /// /// Note that this is typically not used directly, but instead through an /// abstraction which makes sure to provide the correct parameters. /// /// # Examples /// /// ```rust /// use rotary::Channel; /// /// let buf = &[1, 2, 3, 4, 5, 6, 7, 8]; /// let channel = Channel::interleaved(buf, 2, 1); /// /// assert_eq!(channel[1], 4); /// assert_eq!(channel[2], 6); /// ``` pub fn interleaved(buf: &'a [T], channels: usize, channel: usize) -> Self { Self { buf, kind: Kind::Interleaved { channels, channel }, } } /// Access the number of frames on the current channel. /// /// # Examples /// /// ```rust /// use rotary::Buf; /// /// fn test(buf: &dyn Buf<f32>) { /// let left = buf.channel(0); /// let right = buf.channel(1); /// /// assert_eq!(left.frames(), 16); /// assert_eq!(right.frames(), 16); /// } /// /// test(&rotary::dynamic![[0.0; 16]; 2]); /// test(&rotary::sequential![[0.0; 16]; 2]); /// test(&rotary::interleaved![[0.0; 16]; 2]); /// ``` pub fn frames(&self) -> usize { match self.kind { Kind::Linear => self.buf.len(), Kind::Interleaved { channels, .. } => self.buf.len() / channels, } } /// Construct an iterator over the channel. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _}; /// /// let mut left = rotary::interleaved![[0.0f32; 4]; 2]; /// let mut right = rotary::dynamic![[0.0f32; 4]; 2]; /// /// for (l, r) in left.channel_mut(0).iter_mut().zip(right.channel_mut(0)) { /// *l = 1.0; /// *r = 1.0; /// } /// /// assert!(left.channel(0).iter().eq(right.channel(0).iter())); /// /// assert_eq!(left.as_slice(), &[1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0]); /// assert_eq!(&right[0], &[1.0, 1.0, 1.0, 1.0]); /// assert_eq!(&right[1], &[0.0, 0.0, 0.0, 0.0]); /// ``` pub fn iter(self) -> Iter<'a, T> { match self.kind { Kind::Linear => Iter::new(self.buf, 1), Kind::Interleaved { channels, channel } => { let start = usize::min(channel, self.buf.len()); Iter::new(&self.buf[start..], channels) } } } /// Construct a new [Channel] reference with a lifetime associated with the /// current channel instance instead of the underlying buffer. /// /// Most of the time it is not necessary to use this, since [Channel] /// implements [Copy] and its lifetime would coerce to any compatible /// lifetime. This method is currently just here for completeness sake. /// /// Both of these work equally well: /// /// ```rust /// use rotary::Channel; /// /// struct Foo<'a> { /// channel: Channel<'a, i16>, /// } /// /// impl<'a> Foo<'a> { /// fn channel(&self) -> Channel<'_, i16> { /// self.channel.as_ref() /// } /// /// fn coerced_channel(&self) -> Channel<'_, i16> { /// self.channel /// } /// } /// ``` #[inline] pub fn as_ref(&self) -> Channel<'_, T> { Channel { buf: self.buf, kind: self.kind, } } /// Construct a channel buffer where the first `n` frames are skipped. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _}; /// /// let mut from = rotary::interleaved![[0.0f32; 4]; 2]; /// *from.frame_mut(0, 2).unwrap() = 1.0; /// *from.frame_mut(0, 3).unwrap() = 1.0; /// /// let mut to = rotary::interleaved![[0.0f32; 4]; 2]; /// /// to.channel_mut(0).copy_from(from.channel(0).skip(2)); /// assert_eq!(to.as_slice(), &[1.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0]); /// ``` pub fn skip(self, n: usize) -> Self { let Self { buf, kind } = self; match kind { Kind::Linear => Self { buf: buf.get(n..).unwrap_or_default(), kind, }, Kind::Interleaved { channels, .. } => Self { buf: buf.get(n * channels..).unwrap_or_default(), kind, }, } } /// Construct a channel buffer where the last `n` frames are included. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _}; /// /// let from = rotary::interleaved![[1.0f32; 4]; 2]; /// let mut to = rotary::interleaved![[0.0f32; 4]; 2]; /// /// to.channel_mut(0).as_mut().tail(2).copy_from(from.channel(0)); /// assert_eq!(to.as_slice(), &[0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0]); /// ``` pub fn tail(self, n: usize) -> Self { let Self { buf, kind } = self; match kind { Kind::Linear => { let start = buf.len().saturating_sub(n); Self { buf: buf.get(start..).unwrap_or_default(), kind, } } Kind::Interleaved { channels, .. } => { let start = buf.len().saturating_sub(n * channels); Self { buf: buf.get(start..).unwrap_or_default(), kind, } } } } /// Limit the channel bufferto `limit` number of frames. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _}; /// /// let from = rotary::interleaved![[1.0f32; 4]; 2]; /// let mut to = rotary::interleaved![[0.0f32; 4]; 2]; /// /// to.channel_mut(0).copy_from(from.channel(0).limit(2)); /// assert_eq!(to.as_slice(), &[1.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0]); /// ``` pub fn limit(self, limit: usize) -> Self { let Self { buf, kind } = self; match kind { Kind::Linear => Channel { buf: buf.get(..limit).unwrap_or_default(), kind, }, Kind::Interleaved { channels, .. } => Channel { buf: buf.get(..limit * channels).unwrap_or_default(), kind, }, } } /// Construct a range of frames corresponds to the chunk with `len` and /// position `n`. /// /// Which is the range `n * len .. n * len + len`. pub fn chunk(self, n: usize, len: usize) -> Self { let Self { buf, kind } = self; match kind { Kind::Linear => Channel { buf: buf.get(n..n + len).unwrap_or_default(), kind, }, Kind::Interleaved { channels, .. } => { let len = len * channels; let n = n * len; Channel { buf: buf.get(n..n + len).unwrap_or_default(), kind, } } } } /// How many chunks of the given size can you divide buf into. /// /// This includes one extra chunk even if the chunk doesn't divide the frame /// length evenly. /// /// # Examples /// /// ```rust /// use rotary::Buf; /// /// fn test(buf: &dyn Buf<f32>) { /// let left = buf.channel(0); /// let right = buf.channel(1); /// /// assert_eq!(left.chunks(4), 4); /// assert_eq!(right.chunks(4), 4); /// /// assert_eq!(left.chunks(6), 3); /// assert_eq!(right.chunks(6), 3); /// } /// /// test(&rotary::dynamic![[0.0; 16]; 2]); /// test(&rotary::sequential![[0.0; 16]; 2]); /// test(&rotary::interleaved![[0.0; 16]; 2]); /// ``` pub fn chunks(&self, chunk: usize) -> usize { let len = self.frames(); if len % chunk == 0 { len / chunk } else { len / chunk + 1 } } /// Copy into the given slice of output. /// /// # Examples /// /// ```rust /// use rotary::Buf; /// /// fn test(buf: &dyn Buf<f32>) { /// let channel = buf.channel(0); /// /// let mut buf = vec![0.0; 16]; /// channel.copy_into_slice(&mut buf[..]); /// /// assert!(buf.iter().all(|f| *f == 1.0)); /// } /// /// test(&rotary::dynamic![[1.0; 16]; 2]); /// test(&rotary::sequential![[1.0; 16]; 2]); /// test(&rotary::interleaved![[1.0; 16]; 2]); /// ``` pub fn copy_into_slice(&self, out: &mut [T]) where T: Copy, { match self.kind { Kind::Linear => { let end = usize::min(out.len(), self.buf.len()); out[..end].copy_from_slice(&self.buf[..end]); } Kind::Interleaved { channels, channel } => { for (o, f) in out .iter_mut() .zip(self.buf[channel..].iter().step_by(channels)) { *o = *f; } } } } /// Copy into the given iterator. /// /// # Examples /// /// ```rust /// use rotary::Buf; /// /// fn test(buf: &dyn Buf<f32>) { /// let channel = buf.channel(0); /// /// let mut buf = vec![0.0; 16]; /// /// // Copy into every other position in `buf`. /// channel.copy_into_iter(buf.iter_mut().step_by(2)); /// /// for (n, f) in buf.into_iter().enumerate() { /// if n % 2 == 0 { /// assert_eq!(f, 1.0); /// } else { /// assert_eq!(f, 0.0); /// } /// } /// } /// /// test(&rotary::dynamic![[1.0; 16]; 2]); /// test(&rotary::sequential![[1.0; 16]; 2]); /// test(&rotary::interleaved![[1.0; 16]; 2]); /// ``` pub fn copy_into_iter<'out, I>(&self, iter: I) where I: IntoIterator<Item = &'out mut T>, T: 'out + Copy, { match self.kind { Kind::Linear => { for (o, f) in iter.into_iter().zip(self.buf) { *o = *f; } } Kind::Interleaved { channels, channel } => { for (o, f) in iter .into_iter() .zip(self.buf[channel..].iter().step_by(channels)) { *o = *f; } } } } } impl<'a, T> IntoIterator for Channel<'a, T> where T: Copy, { type Item = T; type IntoIter = Iter<'a, T>; fn into_iter(self) -> Self::IntoIter { self.iter() } } impl<'a, T> IntoIterator for &'a Channel<'_, T> where T: Copy, { type Item = T; type IntoIter = Iter<'a, T>; fn into_iter(self) -> Self::IntoIter { self.as_ref().iter() } } impl<T> ops::Index<usize> for Channel<'_, T> { type Output = T; fn index(&self, index: usize) -> &Self::Output { match self.kind { Kind::Linear => &self.buf[index], Kind::Interleaved { channels, channel } => &self.buf[channel + channels * index], } } } /// The mutable buffer of a single channel. /// /// This doesn't provide direct access to the underlying buffer, but rather /// allows us to copy data usinga number of utility functions. #[derive(Debug)] pub struct ChannelMut<'a, T> { buf: &'a mut [T], kind: Kind, } impl<'a, T> ChannelMut<'a, T> { /// Construct a mutable linear channel buffer. /// /// The buffer provided as-is constitutes the frames of the channel. /// /// # Examples /// /// ```rust /// use rotary::ChannelMut; /// /// let buf = &mut [1, 3, 5, 7]; /// let mut channel = ChannelMut::linear(buf); /// /// assert_eq!(channel[1], 3); /// assert_eq!(channel[2], 5); /// /// channel[1] *= 4; /// /// assert_eq!(buf, &[1, 12, 5, 7]); /// ``` pub fn linear(buf: &'a mut [T]) -> Self { Self { buf, kind: Kind::Linear, } } /// Construct a mutable interleaved channel buffer. /// /// The provided buffer must be the complete buffer, which includes *all* /// other channels. The provided `channels` argument is the total number of /// channels in this buffer, and `channel` indicates which specific channel /// this buffer belongs to. /// /// Note that this is typically not used directly, but instead through an /// abstraction which makes sure to provide the correct parameters. /// /// # Examples /// /// ```rust /// use rotary::ChannelMut; /// /// let buf = &mut [1, 2, 3, 4, 5, 6, 7, 8]; /// let mut channel = ChannelMut::interleaved(buf, 2, 1); /// /// assert_eq!(channel[1], 4); /// assert_eq!(channel[2], 6); /// /// channel[1] *= 4; /// /// assert_eq!(buf, &[1, 2, 3, 16, 5, 6, 7, 8]); /// ``` pub fn interleaved(buf: &'a mut [T], channels: usize, channel: usize) -> Self { Self { buf, kind: Kind::Interleaved { channels, channel }, } } /// Convert the current mutable channel into a [Channel] with the lifetime /// matching the underlying buffer. /// /// This is required in order to fully convert a [ChannelMut] into a /// [Channel] with the lifetime associated with the buffer, because if we /// only use [as_ref][ChannelMut::as_ref] we'll actually be creating a /// reference to the mutable buffer instead. /// /// # Examples /// /// ```rust /// use rotary::{Channel, ChannelMut}; /// /// struct Foo<'a> { /// channel: ChannelMut<'a, i16>, /// } /// /// impl<'a> Foo<'a> { /// fn into_channel(self) -> Channel<'a, i16> { /// self.channel.into_ref() /// } /// } /// ``` /// /// In contrast, this doesn't compile: /// /// ```rust,compile_fail /// use rotary::{Channel, ChannelMut}; /// /// struct Foo<'a> { /// channel: ChannelMut<'a, i16>, /// } /// /// impl<'a> Foo<'a> { /// fn into_channel(self) -> Channel<'a, i16> { /// self.channel.as_ref() /// } /// } /// ``` /// /// With the following error: /// /// ```text /// error[E0515]: cannot return value referencing local data `self.channel` /// --> test.rs:11:9 /// | /// 11 | self.channel.as_ref() /// | ------------^^^^^^^^^ /// | | /// | returns a value referencing data owned by the current function /// | `self.channel` is borrowed here ///``` #[inline] pub fn into_ref(self) -> Channel<'a, T> { Channel { buf: self.buf, kind: self.kind, } } /// Construct a new [Channel] reference with a lifetime associated with the /// current channel instance instead of the underlying buffer. /// /// # Examples /// /// ```rust /// use rotary::{Channel, ChannelMut}; /// /// let buf = &mut [1, 2, 3, 4]; /// let channel = ChannelMut::linear(buf); /// /// let channel1 = channel.as_ref(); /// let channel2 = channel1; // Channel is Copy. /// /// assert_eq!(channel1[0], channel2[0]); /// ``` #[inline] pub fn as_ref(&self) -> Channel<'_, T> { Channel { buf: self.buf, kind: self.kind, } } /// Construct a new mutable channel reference with a lifetime associated /// with the current channel instance instead of the underlying buffer. /// /// Reborrowing like this is sometimes necessary, like if you want to pass /// an instance of [ChannelMut] directly into another function instead of /// borrowing it: /// /// ```rust /// use rotary::{BufMut, ChannelMut}; /// /// fn takes_channel_mut(mut channel: ChannelMut<'_, i16>) { /// channel[1] = 42; /// } /// /// let mut buffer = rotary::interleaved![[0; 4]; 2]; /// let mut channel = buffer.channel_mut(1); /// /// takes_channel_mut(channel.as_mut()); /// /// assert_eq!(channel[1], 42); /// ``` /// /// Without the reborrow, we would end up moving the channel: /// /// ```rust,compile_fail /// use rotary::{BufMut, ChannelMut}; /// /// fn takes_channel_mut(mut channel: ChannelMut<'_, i16>) { /// channel[1] = 42; /// } /// /// let mut buffer = rotary::interleaved![[0; 4]; 2]; /// let mut channel = buffer.channel_mut(1); /// /// takes_channel_mut(channel); /// /// assert_eq!(channel[1], 42); /// ``` /// /// Causing the following error: /// /// ```text /// error[E0382]: borrow of moved value: `channel` /// --> test.rs:10:12 /// | /// 10 | let mut channel = buffer.channel_mut(1); /// | ----------- move occurs because `channel` has type `ChannelMut<'_, i16>`, /// | which does not implement the `Copy` trait /// 11 | /// 12 | takes_channel_mut(channel); /// | ------- value moved here /// 13 | /// 14 | assert_eq!(channel[1], 42); /// | ^^^^^^^ value borrowed here after move /// ``` #[inline] pub fn as_mut(&mut self) -> ChannelMut<'_, T> { ChannelMut { buf: self.buf, kind: self.kind, } } /// The number of frames in the buffer. /// /// # Examples /// /// ```rust /// use rotary::BufMut; /// /// fn test(buf: &dyn BufMut<f32>) { /// let left = buf.channel(0); /// let right = buf.channel(1); /// /// assert_eq!(left.frames(), 16); /// assert_eq!(right.frames(), 16); /// } /// /// test(&rotary::dynamic![[0.0; 16]; 2]); /// test(&rotary::sequential![[0.0; 16]; 2]); /// test(&rotary::interleaved![[0.0; 16]; 2]); /// ``` pub fn frames(&self) -> usize { match self.kind { Kind::Linear => self.buf.len(), Kind::Interleaved { channels, .. } => self.buf.len() / channels, } } /// The number of chunks that can fit with the given size. /// /// # Examples /// /// ```rust /// use rotary::BufMut; /// /// fn test(buf: &dyn BufMut<f32>) { /// let left = buf.channel(0); /// let right = buf.channel(1); /// /// assert_eq!(left.chunks(4), 4); /// assert_eq!(right.chunks(4), 4); /// /// assert_eq!(left.chunks(6), 3); /// assert_eq!(right.chunks(6), 3); /// } /// /// test(&rotary::dynamic![[0.0; 16]; 2]); /// test(&rotary::sequential![[0.0; 16]; 2]); /// test(&rotary::interleaved![[0.0; 16]; 2]); /// ``` pub fn chunks(&self, chunk: usize) -> usize { let len = self.frames(); if len % chunk == 0 { len / chunk } else { len / chunk + 1 } } /// Construct an iterator over the channel. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _}; /// /// let mut left = rotary::interleaved![[0.0f32; 4]; 2]; /// let mut right = rotary::dynamic![[0.0f32; 4]; 2]; /// /// for (l, r) in left.channel_mut(0).iter_mut().zip(right.channel_mut(0)) { /// *l = 1.0; /// *r = 1.0; /// } /// /// assert!(left.channel(0).iter().eq(right.channel(0).iter())); /// /// assert_eq!(left.as_slice(), &[1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0]); /// assert_eq!(&right[0], &[1.0, 1.0, 1.0, 1.0]); /// assert_eq!(&right[1], &[0.0, 0.0, 0.0, 0.0]); /// ``` pub fn iter(self) -> Iter<'a, T> { self.into_ref().iter() } /// Construct a mutable iterator over the channel. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _}; /// /// let mut left = rotary::interleaved![[0.0f32; 4]; 2]; /// let mut right = rotary::dynamic![[0.0f32; 4]; 2]; /// /// for (l, r) in left.channel_mut(0).iter_mut().zip(right.channel_mut(0)) { /// *l = 1.0; /// *r = 1.0; /// } /// /// assert!(left.channel(0).iter().eq(right.channel(0).iter())); /// /// assert_eq!(left.as_slice(), &[1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0]); /// assert_eq!(&right[0], &[1.0, 1.0, 1.0, 1.0]); /// assert_eq!(&right[1], &[0.0, 0.0, 0.0, 0.0]); /// ``` pub fn iter_mut(self) -> IterMut<'a, T> { match self.kind { Kind::Linear => IterMut::new(self.buf, 1), Kind::Interleaved { channels, channel } => { let start = usize::min(channel, self.buf.len()); IterMut::new(&mut self.buf[start..], channels) } } } /// Construct a channel buffer where the first `n` frames are skipped. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _}; /// /// let mut buffer = rotary::Interleaved::with_topology(2, 4); /// /// buffer.channel_mut(0).skip(2).copy_from_slice(&[1.0, 1.0]); /// /// assert_eq!(buffer.as_slice(), &[0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0]) /// ``` pub fn skip(self, n: usize) -> Self { let Self { buf, kind } = self; match kind { Kind::Linear => Self { buf: buf.get_mut(n..).unwrap_or_default(), kind, }, Kind::Interleaved { channels, .. } => Self { buf: buf.get_mut(n * channels..).unwrap_or_default(), kind, }, } } /// Construct a channel buffer where the last `n` frames are included. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _}; /// /// let from = rotary::interleaved![[1.0f32; 4]; 2]; /// let mut to = rotary::interleaved![[0.0f32; 4]; 2]; /// /// to.channel_mut(0).as_mut().tail(2).copy_from(from.channel(0)); /// assert_eq!(to.as_slice(), &[0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0]); /// ``` pub fn tail(self, n: usize) -> Self { let Self { buf, kind } = self; match kind { Kind::Linear => { let start = buf.len().saturating_sub(n); Self { buf: buf.get_mut(start..).unwrap_or_default(), kind, } } Kind::Interleaved { channels, .. } => { let start = buf.len().saturating_sub(n * channels); Self { buf: buf.get_mut(start..).unwrap_or_default(), kind, } } } } /// Limit the channel bufferto `limit` number of frames. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _}; /// /// let from = rotary::interleaved![[1.0f32; 4]; 2]; /// let mut to = rotary::interleaved![[0.0f32; 4]; 2]; /// /// to.channel_mut(0).limit(2).copy_from(from.channel(0)); /// assert_eq!(to.as_slice(), &[1.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0]); /// ``` pub fn limit(self, limit: usize) -> Self { let Self { buf, kind } = self; match kind { Kind::Linear => Self { buf: buf.get_mut(..limit).unwrap_or_default(), kind, }, Kind::Interleaved { channels, .. } => Self { buf: buf.get_mut(..limit * channels).unwrap_or_default(), kind, }, } } /// Construct a range of frames corresponds to the chunk with `len` and /// position `n`. /// /// Which is the range `n * len .. n * len + len`. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _}; /// /// let from = rotary::interleaved![[1.0f32; 4]; 2]; /// let mut to = rotary::interleaved![[0.0f32; 4]; 2]; /// /// to.channel_mut(0).chunk(1, 2).copy_from(from.channel(0)); /// assert_eq!(to.as_slice(), &[0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0]); /// ``` /// /// # Examples /// /// ```rust /// use rotary::Buf; /// /// fn test(buf: &dyn Buf<f32>) { /// let channel = buf.channel(0); /// /// let mut buf = vec![0.0; 4]; /// channel.chunk(3, 4).copy_into_slice(&mut buf[..]); /// /// assert!(buf.iter().all(|f| *f == 1.0)); /// } /// /// test(&rotary::dynamic![[1.0; 16]; 2]); /// test(&rotary::sequential![[1.0; 16]; 2]); /// test(&rotary::interleaved![[1.0; 16]; 2]); /// ``` pub fn chunk(self, n: usize, len: usize) -> Self { let Self { buf, kind } = self; match kind { Kind::Linear => Self { buf: buf.get_mut(n..n + len).unwrap_or_default(), kind, }, Kind::Interleaved { channels, .. } => { let len = len * channels; let n = n * len; Self { buf: buf.get_mut(n..n + len).unwrap_or_default(), kind, } } } } /// Copy from the given slice. /// /// # Examples /// /// ```rust /// use rotary::BufMut; /// /// fn test(buf: &mut dyn BufMut<f32>) { /// buf.channel_mut(0).copy_from_slice(&[1.0; 4][..]); /// /// let mut out = vec![0.0; 8]; /// buf.channel(0).copy_into_slice(&mut out); /// /// assert_eq!(out, vec![1.0, 1.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0]); /// } /// /// test(&mut rotary::dynamic![[0.0; 8]; 2]); /// test(&mut rotary::sequential![[0.0; 8]; 2]); /// test(&mut rotary::interleaved![[0.0; 8]; 2]); /// ``` pub fn copy_from_slice(&mut self, buf: &[T]) where T: Copy, { match self.kind { Kind::Linear => { let len = usize::min(self.buf.len(), buf.len()); self.buf[..len].copy_from_slice(&buf[..len]); } Kind::Interleaved { channels, channel } => { for (o, f) in self.buf[channel..].iter_mut().step_by(channels).zip(buf) { *o = *f; } } } } /// Copy a chunked destination from an iterator. /// /// # Examples /// /// ```rust /// use rotary::BufMut; /// /// fn test(buf: &mut dyn BufMut<f32>) { /// buf.channel_mut(0).skip(2).copy_from_iter(vec![1.0; 4]); /// /// let mut out = vec![0.0; 8]; /// buf.channel(0).copy_into_slice(&mut out); /// /// assert_eq!(out, vec![0.0, 0.0, 1.0, 1.0, 1.0, 1.0, 0.0, 0.0]); /// } /// /// test(&mut rotary::dynamic![[0.0; 8]; 2]); /// test(&mut rotary::sequential![[0.0; 8]; 2]); /// test(&mut rotary::interleaved![[0.0; 8]; 2]); /// ``` /// /// ```rust /// use rotary::BufMut; /// /// fn test(buf: &mut dyn BufMut<f32>) { /// buf.channel_mut(0).skip(2).chunk(0, 2).copy_from_iter(vec![1.0; 4]); /// /// let mut out = vec![0.0; 8]; /// buf.channel(0).copy_into_slice(&mut out); /// /// assert_eq!(out, vec![0.0, 0.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0]); /// } /// /// test(&mut rotary::dynamic![[0.0; 8]; 2]); /// test(&mut rotary::sequential![[0.0; 8]; 2]); /// test(&mut rotary::interleaved![[0.0; 8]; 2]); /// ``` pub fn copy_from_iter<I>(&mut self, iter: I) where I: IntoIterator<Item = T>, { match self.kind { Kind::Linear => { for (o, f) in self.buf.iter_mut().zip(iter) { *o = f; } } Kind::Interleaved { channels, channel } => { let buf = self.buf[channel..].iter_mut().step_by(channels); for (o, f) in buf.zip(iter) { *o = f; } } } } /// Copy this channel from another. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _}; /// /// let from = rotary::dynamic![[1.0f32; 4]; 2]; /// let mut to = rotary::interleaved![[0.0f32; 4]; 3]; /// /// to.channel_mut(0).copy_from(from.channel(1)); /// assert_eq!(to.as_slice(), &[1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0]); /// ``` pub fn copy_from(&mut self, from: Channel<'_, T>) where T: Copy, { match (self.kind, from.kind) { (Kind::Linear, Kind::Linear) => { self.buf.copy_from_slice(&from.buf[..]); } _ => { for (o, f) in self.as_mut().iter_mut().zip(from) { *o = f; } } } } /// Translate this channel from another. /// /// This will translate each sample in the channel through the appropriate /// [Translate] implementation. /// /// This is used for converting a buffer containing one type of sample into /// another. /// /// # Examples /// /// ```rust /// use rotary::{Buf as _, BufMut as _}; /// /// let from = rotary::dynamic![[u16::MAX; 4]; 2]; /// let mut to = rotary::interleaved![[0.0f32; 4]; 3]; /// /// to.channel_mut(0).translate_from(from.channel(1)); /// assert_eq!(to.as_slice(), &[1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0]); /// ``` pub fn translate_from<U>(&mut self, from: Channel<'_, U>) where U: Copy, T: Translate<U>, { for (o, f) in self.as_mut().iter_mut().zip(from) { *o = T::translate(f); } } } impl<'a, T> IntoIterator for ChannelMut<'a, T> { type Item = &'a mut T; type IntoIter = IterMut<'a, T>; fn into_iter(self) -> Self::IntoIter { self.iter_mut() } } impl<'a, T> IntoIterator for &'a mut ChannelMut<'_, T> { type Item = &'a mut T; type IntoIter = IterMut<'a, T>; fn into_iter(self) -> Self::IntoIter { self.as_mut().iter_mut() } } impl<T> ops::Index<usize> for ChannelMut<'_, T> { type Output = T; fn index(&self, index: usize) -> &Self::Output { match self.kind { Kind::Linear => &self.buf[index], Kind::Interleaved { channels, channel } => &self.buf[channel + channels * index], } } } /// Get a mutable reference to the frame at the given index. /// /// # Panics /// /// Panics if the given frame is out of bounds for this channel. /// /// See [frames][Self::frames]. /// /// # Examples /// /// ```rust /// use rotary::BufMut; /// /// fn test(buf: &mut dyn BufMut<f32>) { /// buf.channel_mut(0)[1] = 1.0; /// buf.channel_mut(0)[7] = 1.0; /// /// let mut out = vec![0.0; 8]; /// buf.channel(0).copy_into_slice(&mut out); /// /// assert_eq!(out, vec![0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0]); /// } /// /// test(&mut rotary::dynamic![[0.0; 8]; 2]); /// test(&mut rotary::sequential![[0.0; 8]; 2]); /// test(&mut rotary::interleaved![[0.0; 8]; 2]); /// ``` impl<T> ops::IndexMut<usize> for ChannelMut<'_, T> { fn index_mut(&mut self, index: usize) -> &mut Self::Output { match self.kind { Kind::Linear => &mut self.buf[index], Kind::Interleaved { channels, channel } => &mut self.buf[channel + channels * index], } } }