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/*
* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "common_audio/resampler/include/push_resampler.h"
#include <stdint.h>
#include <string.h>
#include <memory>
#include "api/audio/audio_view.h"
#include "common_audio/include/audio_util.h"
#include "common_audio/resampler/push_sinc_resampler.h"
#include "rtc_base/checks.h"
namespace webrtc {
namespace {
// Maximum concurrent number of channels for `PushResampler<>`.
// Note that this may be different from what the maximum is for audio codecs.
constexpr int kMaxNumberOfChannels = 8;
} // namespace
template <typename T>
PushResampler<T>::PushResampler() = default;
template <typename T>
PushResampler<T>::PushResampler(size_t src_samples_per_channel,
size_t dst_samples_per_channel,
size_t num_channels) {
EnsureInitialized(src_samples_per_channel, dst_samples_per_channel,
num_channels);
}
template <typename T>
PushResampler<T>::~PushResampler() = default;
template <typename T>
void PushResampler<T>::EnsureInitialized(size_t src_samples_per_channel,
size_t dst_samples_per_channel,
size_t num_channels) {
RTC_DCHECK_GT(src_samples_per_channel, 0);
RTC_DCHECK_GT(dst_samples_per_channel, 0);
RTC_DCHECK_GT(num_channels, 0);
RTC_DCHECK_LE(src_samples_per_channel, kMaxSamplesPerChannel10ms);
RTC_DCHECK_LE(dst_samples_per_channel, kMaxSamplesPerChannel10ms);
RTC_DCHECK_LE(num_channels, kMaxNumberOfChannels);
if (src_samples_per_channel == SamplesPerChannel(source_view_) &&
dst_samples_per_channel == SamplesPerChannel(destination_view_) &&
num_channels == NumChannels(source_view_)) {
// No-op if settings haven't changed.
return;
}
// Allocate two buffers for all source and destination channels.
// Then organize source and destination views together with an array of
// resamplers for each channel in the deinterlaved buffers.
source_.reset(new T[src_samples_per_channel * num_channels]);
destination_.reset(new T[dst_samples_per_channel * num_channels]);
source_view_ = DeinterleavedView<T>(source_.get(), src_samples_per_channel,
num_channels);
destination_view_ = DeinterleavedView<T>(
destination_.get(), dst_samples_per_channel, num_channels);
resamplers_.resize(num_channels);
for (size_t i = 0; i < num_channels; ++i) {
resamplers_[i] = std::make_unique<PushSincResampler>(
src_samples_per_channel, dst_samples_per_channel);
}
}
template <typename T>
void PushResampler<T>::Resample(InterleavedView<const T> src,
InterleavedView<T> dst) {
EnsureInitialized(SamplesPerChannel(src), SamplesPerChannel(dst),
NumChannels(src));
RTC_DCHECK_EQ(NumChannels(src), NumChannels(source_view_));
RTC_DCHECK_EQ(NumChannels(dst), NumChannels(destination_view_));
RTC_DCHECK_EQ(SamplesPerChannel(src), SamplesPerChannel(source_view_));
RTC_DCHECK_EQ(SamplesPerChannel(dst), SamplesPerChannel(destination_view_));
if (SamplesPerChannel(src) == SamplesPerChannel(dst)) {
// The old resampler provides this memcpy facility in the case of matching
// sample rates, so reproduce it here for the sinc resampler.
CopySamples(dst, src);
return;
}
Deinterleave(src, source_view_);
for (size_t i = 0; i < resamplers_.size(); ++i) {
size_t dst_length_mono =
resamplers_[i]->Resample(source_view_[i], destination_view_[i]);
RTC_DCHECK_EQ(dst_length_mono, SamplesPerChannel(dst));
}
Interleave<T>(destination_view_, dst);
}
template <typename T>
void PushResampler<T>::Resample(MonoView<const T> src, MonoView<T> dst) {
RTC_DCHECK_EQ(resamplers_.size(), 1);
RTC_DCHECK_EQ(SamplesPerChannel(src), SamplesPerChannel(source_view_));
RTC_DCHECK_EQ(SamplesPerChannel(dst), SamplesPerChannel(destination_view_));
if (SamplesPerChannel(src) == SamplesPerChannel(dst)) {
CopySamples(dst, src);
} else {
resamplers_[0]->Resample(src, dst);
}
}
// Explictly generate required instantiations.
template class PushResampler<int16_t>;
template class PushResampler<float>;
} // namespace webrtc
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