add bark_core::audio with Sample, Frame types and conversion fns

Cargo.lock

@@ -235,9 +235,9 @@ checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
 
 [[package]]
 name = "bytemuck"
-version = "1.13.1"
+version = "1.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "17febce684fd15d89027105661fec94afb475cb995fbc59d2865198446ba2eea"
+checksum = "374d28ec25809ee0e23827c2ab573d729e293f281dfe393500e7ad618baa61c6"
 dependencies = [
  "bytemuck_derive",
 ]

Cargo.toml

@@ -11,7 +11,7 @@ bark-core = { path = "bark-core" }
 bark-protocol = { path = "bark-protocol" }
 
 bitflags = { version = "2.4", features = ["bytemuck"] }
-bytemuck = { version = "1.13", features = ["derive"] }
+bytemuck = { version = "1.14", features = ["derive", "must_cast"] }
 derive_more = { version = "0.99" }
 heapless = "0.7"
 log = "0.4"

bark-core/src/audio.rs

@@ -0,0 +1,30 @@
+use bark_protocol::CHANNELS;
+use bytemuck::{Pod, Zeroable};
+
+pub type Sample = f32;
+
+#[derive(Pod, Zeroable, Copy, Clone, Debug)]
+#[repr(C)]
+pub struct Frame(pub Sample, pub Sample);
+
+pub fn from_interleaved(samples: &[Sample]) -> &[Frame] {
+    // ensure samples contains whole frames only
+    assert_eq!(0, samples.len() % usize::from(CHANNELS));
+
+    bytemuck::cast_slice(samples)
+}
+
+pub fn from_interleaved_mut(samples: &mut [Sample]) -> &mut [Frame] {
+    // ensure samples contains whole frames only
+    assert_eq!(0, samples.len() % usize::from(CHANNELS));
+
+    bytemuck::cast_slice_mut(samples)
+}
+
+pub fn to_interleaved(frames: &[Frame]) -> &[Sample] {
+    bytemuck::must_cast_slice(frames)
+}
+
+pub fn to_interleaved_mut(frames: &mut [Frame]) -> &mut [Sample] {
+    bytemuck::must_cast_slice_mut(frames)
+}

bark-core/src/lib.rs

@@ -1,3 +1,4 @@
+pub mod audio;
 pub mod consts;
 pub mod decode;
 pub mod encode;