Add basic implementation of audio buffer and sample

Cargo.toml

@@ -12,3 +12,20 @@ repository = "https://github.com/webrtc-rs/media"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+util = { package = "webrtc-util", version = "0.3.0", default-features = false, features = [
+    "marshal",
+] }
+
+anyhow = "1.0.41"
+byteorder = "1.4.3"
+bytes = "1.0.1"
+displaydoc = "0.2.1"
+thiserror = "1.0.25"
+
+[dev-dependencies]
+criterion = { version = "0.3.4", features = ["html_reports"] }
+nearly_eq = "0.2.4"
+
+[[bench]]
+name = "audio_buffer"
+harness = false

benches/audio_buffer.rs

@@ -0,0 +1,39 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+use webrtc_media::audio::buffer::{
+    layout::{Deinterleaved, Interleaved},
+    Buffer,
+};
+
+fn benchmark_from(c: &mut Criterion) {
+    type Sample = i32;
+    let channels = 4;
+    let frames = 100_000;
+    let deinterleaved_buffer: Buffer<Sample, Deinterleaved> = {
+        let samples = (0..(channels * frames)).map(|i| i as i32).collect();
+        Buffer::new(samples, channels)
+    };
+    let interleaved_buffer: Buffer<Sample, Interleaved> = {
+        let samples = (0..(channels * frames)).map(|i| i as i32).collect();
+        Buffer::new(samples, channels)
+    };
+
+    c.bench_function("Buffer<T, Interleaved> => Buffer<T, Deinterleaved>", |b| {
+        b.iter(|| {
+            black_box(Buffer::<Sample, Interleaved>::from(
+                deinterleaved_buffer.as_ref(),
+            ));
+        })
+    });
+
+    c.bench_function("Buffer<T, Deinterleaved> => Buffer<T, Interleaved>", |b| {
+        b.iter(|| {
+            black_box(Buffer::<Sample, Deinterleaved>::from(
+                interleaved_buffer.as_ref(),
+            ));
+        })
+    });
+}
+
+criterion_group!(benches, benchmark_from);
+criterion_main!(benches);

src/audio.rs

@@ -0,0 +1,4 @@
+pub mod buffer;
+mod sample;
+
+pub use sample::Sample;