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// Copyright 2025 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use cxx::UniquePtr;
use webrtc_sys::audio_resampler as sys_ar;
pub struct AudioResampler {
sys_handle: UniquePtr<sys_ar::ffi::AudioResampler>,
}
impl Default for AudioResampler {
fn default() -> Self {
Self { sys_handle: sys_ar::ffi::create_audio_resampler() }
}
}
impl AudioResampler {
pub fn remix_and_resample<'a>(
&'a mut self,
src: &[i16],
samples_per_channel: u32,
num_channels: u32,
sample_rate: u32,
dst_num_channels: u32,
dst_sample_rate: u32,
) -> &'a [i16] {
assert!(src.len() >= (samples_per_channel * num_channels) as usize, "src buffer too small");
unsafe {
let len = self.sys_handle.pin_mut().remix_and_resample(
src.as_ptr(),
samples_per_channel as usize,
num_channels as usize,
sample_rate as i32,
dst_num_channels as usize,
dst_sample_rate as i32,
);
std::slice::from_raw_parts(self.sys_handle.data(), len / 2)
}
}
}