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use crate::buf::Buf;
use crate::frame::Frame;
/// A buffer which has a unifom channel size.
pub trait UniformBuf: Buf {
/// The type the channel assumes when coerced into a reference.
type Frame<'this>: Frame<Sample = Self::Sample>
where
Self: 'this;
/// A borrowing iterator over the channel.
type IterFrames<'this>: Iterator<Item = Self::Frame<'this>>
where
Self: 'this;
/// Get a single frame at the given offset.
///
/// # Examples
///
/// ```
/// use audio::{Frame, UniformBuf};
///
/// fn test<B>(buf: B)
/// where
/// B: UniformBuf<Sample = u32>,
/// {
/// let frame = buf.get_frame(0).unwrap();
/// assert_eq!(frame.get(1), Some(5));
/// assert_eq!(frame.iter().collect::<Vec<_>>(), [1, 5]);
///
/// let frame = buf.get_frame(2).unwrap();
/// assert_eq!(frame.get(1), Some(7));
/// assert_eq!(frame.iter().collect::<Vec<_>>(), [3, 7]);
///
/// assert!(buf.get_frame(4).is_none());
/// }
///
/// test(audio::sequential![[1, 2, 3, 4], [5, 6, 7, 8]]);
/// test(audio::wrap::sequential([1, 2, 3, 4, 5, 6, 7, 8], 2));
///
/// test(audio::interleaved![[1, 2, 3, 4], [5, 6, 7, 8]]);
/// test(audio::wrap::interleaved([1, 5, 2, 6, 3, 7, 4, 8], 2));
/// ```
fn get_frame(&self, frame: usize) -> Option<Self::Frame<'_>>;
/// Construct an iterator over all the frames in the audio buffer.
///
/// # Examples
///
/// ```
/// use audio::{Frame, UniformBuf};
///
/// fn test<B>(buf: B)
/// where
/// B: UniformBuf<Sample = u32>,
/// {
/// let mut it = buf.iter_frames();
///
/// let frame = it.next().unwrap();
/// assert_eq!(frame.get(1), Some(5));
/// assert_eq!(frame.iter().collect::<Vec<_>>(), [1, 5]);
///
/// assert!(it.next().is_some());
///
/// let frame = it.next().unwrap();
/// assert_eq!(frame.get(1), Some(7));
/// assert_eq!(frame.iter().collect::<Vec<_>>(), [3, 7]);
///
/// assert!(it.next().is_some());
/// assert!(it.next().is_none());
/// }
///
/// test(audio::sequential![[1, 2, 3, 4], [5, 6, 7, 8]]);
/// test(audio::wrap::interleaved([1, 5, 2, 6, 3, 7, 4, 8], 2));
///
/// test(audio::interleaved![[1, 2, 3, 4], [5, 6, 7, 8]]);
/// test(audio::wrap::sequential([1, 2, 3, 4, 5, 6, 7, 8], 2));
/// ```
fn iter_frames(&self) -> Self::IterFrames<'_>;
}