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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.
*/
#include "livekit/audio_resampler.h"
#include <memory>
#include "audio/remix_resample.h"
#include "api/audio/audio_view.h"
#include "api/audio/audio_frame.h"
namespace livekit_ffi {
size_t AudioResampler::remix_and_resample(const int16_t* src,
size_t samples_per_channel,
size_t num_channels,
int sample_rate,
size_t dest_num_channels,
int dest_sample_rate) {
frame_.num_channels_ = dest_num_channels;
frame_.sample_rate_hz_ = dest_sample_rate;
frame_.samples_per_channel_ = webrtc::SampleRateToDefaultChannelSize(dest_sample_rate);
webrtc::InterleavedView<const int16_t> source(static_cast<const int16_t*>(src),
samples_per_channel,
num_channels);
webrtc::voe::RemixAndResample(source, sample_rate, &resampler_, &frame_);
return frame_.num_channels() * frame_.samples_per_channel() * sizeof(int16_t);
}
const int16_t* AudioResampler::data() const {
return frame_.data();
}
std::unique_ptr<AudioResampler> create_audio_resampler() {
return std::make_unique<AudioResampler>();
}
} // namespace livekit_ffi