HEnquist · HEnquist · Apr 1, 2026 · Apr 1, 2026
diff --git a/Cargo.toml b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "rubato"
-version = "1.0.1"
-rust-version = "1.74"
+version = "2.0.0"
+rust-version = "1.85"
 authors = ["HEnquist <henrik.enquist@gmail.com>"]
 description = "Asynchronous resampling library intended for audio data"
 license = "MIT"
@@ -25,24 +25,24 @@ realfft = { version = "3.5.0", optional = true }
 num-complex = { version = "0.4", optional = true }
 num-integer = "0.1.45"
 num-traits = "0.2"
-#audioadapter = {version = "2.0.0", path = "../audioadapter-rs/audioadapter"}
-audioadapter = "2.0"
-#audioadapter-buffers = {version = "2.0.0", path = "../audioadapter-rs/audioadapter-buffers"}
-audioadapter-buffers = "2.0"
+#audioadapter = {version = "3.0.0", path = "../audioadapter-rs/audioadapter"}
+audioadapter = "3.0"
+#audioadapter-buffers = {version = "3.0.0", path = "../audioadapter-rs/audioadapter-buffers"}
+audioadapter-buffers = "3.0"
 visibility = "0.1.1"
 windowfunctions = "0.1.1"
 
 [dev-dependencies] 
-env_logger = "0.10.0"
+env_logger = "0.11.0"
 criterion = "0.8"
-rand = "0.8.5"
+rand = "0.10.0"
 num-traits = "0.2.15"
 log = "0.4.18"
 approx = "0.5.1"
 test-log = "0.2.16"
 test-case = "3"
-#audioadapter-sample = {version = "2.0.0", path = "../audioadapter-rs/audioadapter-sample"}
-audioadapter-sample = "2.0"
+#audioadapter-sample = {version = "3.0.0", path = "../audioadapter-rs/audioadapter-sample"}
+audioadapter-sample = "3.0"
 
 [[bench]]
 name = "resamplers"

diff --git a/README.md b/README.md
@@ -310,9 +310,12 @@ Many audio editors, for example Audacity, are also able to directly import and e
 
 ## Compatibility
 
-The `rubato` crate requires rustc version 1.74 or newer.
+The `rubato` crate requires rustc version 1.85 or newer.
 
 ## Changelog
+- v2.0.0
+  - Update to `audioadapter` 3.0.
+  - Add re-export of `audioadapter-buffers`.
 - v1.0.1
   - Fix calculation in process_all_needed_output_len method.
 - v1.0.0

diff --git a/src/asynchro.rs b/src/asynchro.rs
@@ -641,7 +641,6 @@ mod tests {
     };
     use crate::{Async, FixedAsync};
     use audioadapter_buffers::direct::SequentialSliceOfVecs;
-    use rand::Rng;
     use test_case::test_matrix;
 
     fn basic_params() -> SincInterpolationParameters {
@@ -815,4 +814,91 @@ mod tests {
         resampler.set_chunk_size(600).unwrap();
         check_output!(resampler, f64);
     }
+
+    fn process_and_get_frame_counts(resampler: &mut Async<f64>) -> (usize, usize) {
+        let input_frames = resampler.input_frames_next();
+        let output_frames_max = resampler.output_frames_max();
+        let input_data = vec![vec![0.25; input_frames]; 2];
+        let input = SequentialSliceOfVecs::new(&input_data, 2, input_frames).unwrap();
+
+        let mut output_data = vec![vec![0.0; output_frames_max]; 2];
+        let mut output =
+            SequentialSliceOfVecs::new_mut(&mut output_data, 2, output_frames_max).unwrap();
+
+        let (consumed_frames, produced_frames) = resampler
+            .process_into_buffer(&input, &mut output, None)
+            .unwrap();
+        (consumed_frames, produced_frames)
+    }
+
+    fn process_chunks_and_get_total_frame_counts(
+        resampler: &mut Async<f64>,
+        nbr_chunks: usize,
+    ) -> (usize, usize) {
+        (0..nbr_chunks).fold((0, 0), |(sum_in, sum_out), _| {
+            let (frames_in, frames_out) = process_and_get_frame_counts(resampler);
+            (sum_in + frames_in, sum_out + frames_out)
+        })
+    }
+
+    fn assert_ratio_within_tolerance(
+        total_in: usize,
+        total_out: usize,
+        expected_ratio: f64,
+        tolerance: f64,
+        label: &str,
+    ) {
+        let measured_ratio = total_out as f64 / total_in as f64;
+        let lower = expected_ratio - tolerance;
+        let upper = expected_ratio + tolerance;
+        assert!(
+            measured_ratio >= lower && measured_ratio <= upper,
+            "{} ratio out of range: got {}, expected {} +/- {} (out {}, in {})",
+            label,
+            measured_ratio,
+            expected_ratio,
+            tolerance,
+            total_out,
+            total_in,
+        );
+    }
+
+    fn check_relative_ratio_changes_frame_ratio(mut resampler: Async<f64>) {
+        let nbr_chunks = 8;
+        let tolerance = 0.01;
+
+        let (baseline_in, baseline_out) =
+            process_chunks_and_get_total_frame_counts(&mut resampler, nbr_chunks);
+        assert_ratio_within_tolerance(baseline_in, baseline_out, 1.0, tolerance, "Baseline");
+
+        // Lower ratio speeds up output.
+        resampler.set_resample_ratio_relative(0.75, false).unwrap();
+        let (lower_in, lower_out) =
+            process_chunks_and_get_total_frame_counts(&mut resampler, nbr_chunks);
+        assert_ratio_within_tolerance(lower_in, lower_out, 0.75, tolerance, "0.75x");
+
+        // Higher ratio slows down output.
+        resampler.set_resample_ratio_relative(1.25, false).unwrap();
+        let (higher_in, higher_out) =
+            process_chunks_and_get_total_frame_counts(&mut resampler, nbr_chunks);
+        assert_ratio_within_tolerance(higher_in, higher_out, 1.25, tolerance, "1.25x");
+    }
+
+    #[test_log::test(test_matrix(
+        [FixedAsync::Input, FixedAsync::Output]
+    ))]
+    fn poly_relative_ratio_changes_frame_ratio(fixed: FixedAsync) {
+        let resampler =
+            Async::<f64>::new_poly(1.0, 4.0, PolynomialDegree::Cubic, 1024, 2, fixed).unwrap();
+        check_relative_ratio_changes_frame_ratio(resampler);
+    }
+
+    #[test_log::test(test_matrix(
+        [FixedAsync::Input, FixedAsync::Output]
+    ))]
+    fn sinc_relative_ratio_changes_frame_ratio(fixed: FixedAsync) {
+        let params = basic_params();
+        let resampler = Async::<f64>::new_sinc(1.0, 4.0, &params, 1024, 2, fixed).unwrap();
+        check_relative_ratio_changes_frame_ratio(resampler);
+    }
 }
diff --git a/src/lib.rs b/src/lib.rs
@@ -4,6 +4,7 @@
 extern crate log;
 
 pub use audioadapter;
+pub use audioadapter_buffers;
 
 use audioadapter::{Adapter, AdapterMut};
 use audioadapter_buffers::owned::InterleavedOwned;
@@ -679,11 +680,10 @@ pub mod tests {
         ($resampler:ident) => {
             let frames_in = $resampler.input_frames_next();
 
-            let mut rng = rand::thread_rng();
             let mut input_data = vec![vec![0.0f64; frames_in]; 2];
             input_data
                 .iter_mut()
-                .for_each(|ch| ch.iter_mut().for_each(|s| *s = rng.gen()));
+                .for_each(|ch| ch.iter_mut().for_each(|s| *s = rand::random()));
 
             let input = SequentialSliceOfVecs::new(&input_data, 2, frames_in).unwrap();
 
@@ -718,11 +718,10 @@ pub mod tests {
         ($resampler:ident) => {
             let frames_in = $resampler.input_frames_next();
 
-            let mut rng = rand::thread_rng();
             let mut input_data_1 = vec![vec![0.0f64; frames_in]; 2];
             input_data_1
                 .iter_mut()
-                .for_each(|ch| ch.iter_mut().for_each(|s| *s = rng.gen()));
+                .for_each(|ch| ch.iter_mut().for_each(|s| *s = rand::random()));
 
             let offset = 123;
             let mut input_data_2 = vec![vec![0.0f64; frames_in + offset]; 2];
@@ -771,11 +770,10 @@ pub mod tests {
         ($resampler:ident) => {
             let frames_in = $resampler.input_frames_next();
 
-            let mut rng = rand::thread_rng();
             let mut input_data = vec![vec![0.0f64; frames_in]; 2];
             input_data
                 .iter_mut()
-                .for_each(|ch| ch.iter_mut().for_each(|s| *s = rng.gen()));
+                .for_each(|ch| ch.iter_mut().for_each(|s| *s = rand::random()));
 
             let input = SequentialSliceOfVecs::new(&input_data, 2, frames_in).unwrap();
 
@@ -823,11 +821,10 @@ pub mod tests {
         ($resampler:ident) => {
             let frames_in = $resampler.input_frames_next();
 
-            let mut rng = rand::thread_rng();
             let mut input_data = vec![vec![0.0f64; frames_in]; 2];
             input_data
                 .iter_mut()
-                .for_each(|ch| ch.iter_mut().for_each(|s| *s = rng.gen()));
+                .for_each(|ch| ch.iter_mut().for_each(|s| *s = rand::random()));
 
             let input = SequentialSliceOfVecs::new(&input_data, 2, frames_in).unwrap();
 

diff --git a/src/sinc_interpolator/mod.rs b/src/sinc_interpolator/mod.rs
@@ -156,7 +156,6 @@ mod tests {
     use super::SincInterpolator;
     use crate::WindowFunction;
     use num_traits::Float;
-    use rand::Rng;
     use test_log::test;
 
     fn get_sinc_interpolated<T: Float>(wave: &[T], index: usize, sinc: &[T]) -> T {
@@ -169,10 +168,9 @@ mod tests {
 
     #[test]
     fn test_scalar_interpolator_64() {
-        let mut rng = rand::thread_rng();
         let mut wave = Vec::new();
         for _ in 0..2048 {
-            wave.push(rng.gen::<f64>());
+            wave.push(rand::random::<f64>());
         }
         let sinc_len = 256;
         let f_cutoff = 0.94733715;
@@ -188,10 +186,9 @@ mod tests {
 
     #[test]
     fn test_scalar_interpolator_32() {
-        let mut rng = rand::thread_rng();
         let mut wave = Vec::new();
         for _ in 0..2048 {
-            wave.push(rng.gen::<f32>());
+            wave.push(rand::random::<f32>());
         }
         let sinc_len = 256;
         let f_cutoff = 0.94733715;

diff --git a/src/sinc_interpolator/sinc_interpolator_avx.rs b/src/sinc_interpolator/sinc_interpolator_avx.rs
@@ -219,7 +219,6 @@ mod tests {
     use crate::sinc_interpolator::SincInterpolator;
     use crate::WindowFunction;
     use num_traits::Float;
-    use rand::Rng;
     use test_log::test;
 
     fn get_sinc_interpolated<T: Float>(wave: &[T], index: usize, sinc: &[T]) -> T {
@@ -232,10 +231,9 @@ mod tests {
 
     #[test]
     fn test_avx_interpolator_64() {
-        let mut rng = rand::thread_rng();
         let mut wave = Vec::new();
         for _ in 0..2048 {
-            wave.push(rng.gen::<f64>());
+            wave.push(rand::random::<f64>());
         }
         let sinc_len = 256;
         let f_cutoff = 0.94733715;
@@ -259,10 +257,9 @@ mod tests {
 
     #[test]
     fn test_avx_interpolator_32() {
-        let mut rng = rand::thread_rng();
         let mut wave = Vec::new();
         for _ in 0..2048 {
-            wave.push(rng.gen::<f32>());
+            wave.push(rand::random::<f32>());
         }
         let sinc_len = 256;
         let f_cutoff = 0.94733715;

diff --git a/src/sinc_interpolator/sinc_interpolator_neon.rs b/src/sinc_interpolator/sinc_interpolator_neon.rs
@@ -223,7 +223,6 @@ mod tests {
     use crate::sinc_interpolator::SincInterpolator;
     use crate::WindowFunction;
     use num_traits::Float;
-    use rand::Rng;
     use test_log::test;
 
     fn get_sinc_interpolated<T: Float>(wave: &[T], index: usize, sinc: &[T]) -> T {
@@ -236,10 +235,9 @@ mod tests {
 
     #[test]
     fn test_neon_interpolator_64() {
-        let mut rng = rand::thread_rng();
         let mut wave = Vec::new();
         for _ in 0..2048 {
-            wave.push(rng.gen::<f64>());
+            wave.push(rand::random::<f64>());
         }
         let sinc_len = 256;
         let f_cutoff = 0.94733715;
@@ -255,10 +253,9 @@ mod tests {
 
     #[test]
     fn test_neon_interpolator_32() {
-        let mut rng = rand::thread_rng();
         let mut wave = Vec::new();
         for _ in 0..2048 {
-            wave.push(rng.gen::<f32>());
+            wave.push(rand::random::<f32>());
         }
         let sinc_len = 256;
         let f_cutoff = 0.94733715;

diff --git a/src/sinc_interpolator/sinc_interpolator_sse.rs b/src/sinc_interpolator/sinc_interpolator_sse.rs
@@ -231,7 +231,6 @@ mod tests {
     use crate::sinc_interpolator::SincInterpolator;
     use crate::WindowFunction;
     use num_traits::Float;
-    use rand::Rng;
     use test_log::test;
 
     fn get_sinc_interpolated<T: Float>(wave: &[T], index: usize, sinc: &[T]) -> T {
@@ -244,10 +243,9 @@ mod tests {
 
     #[test]
     fn test_sse_interpolator_64() {
-        let mut rng = rand::thread_rng();
         let mut wave = Vec::new();
         for _ in 0..2048 {
-            wave.push(rng.gen::<f64>());
+            wave.push(rand::random::<f64>());
         }
         let sinc_len = 256;
         let f_cutoff = 0.94733715;
@@ -263,10 +261,9 @@ mod tests {
 
     #[test]
     fn test_sse_interpolator_32() {
-        let mut rng = rand::thread_rng();
         let mut wave = Vec::new();
         for _ in 0..2048 {
-            wave.push(rng.gen::<f32>());
+            wave.push(rand::random::<f32>());
         }
         let sinc_len = 256;
         let f_cutoff = 0.94733715;

diff --git a/src/synchro.rs b/src/synchro.rs
@@ -645,7 +645,6 @@ mod tests {
     };
     use approx::assert_abs_diff_eq;
     use audioadapter_buffers::direct::SequentialSliceOfVecs;
-    use rand::Rng;
     use test_case::test_matrix;
 
     #[test_log::test]