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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 "webrtc/common_audio/resampler/include/push_resampler.h"
#include <string.h>
#include "webrtc/common_audio/include/audio_util.h"
#include "webrtc/common_audio/resampler/include/resampler.h"
#include "webrtc/common_audio/resampler/push_sinc_resampler.h"
namespace webrtc {
template <typename T>
PushResampler<T>::PushResampler()
: src_sample_rate_hz_(0),
dst_sample_rate_hz_(0),
num_channels_(0) {
}
template <typename T>
PushResampler<T>::~PushResampler() {
}
template <typename T>
int PushResampler<T>::InitializeIfNeeded(int src_sample_rate_hz,
int dst_sample_rate_hz,
int num_channels) {
if (src_sample_rate_hz == src_sample_rate_hz_ &&
dst_sample_rate_hz == dst_sample_rate_hz_ &&
num_channels == num_channels_)
// No-op if settings haven't changed.
return 0;
if (src_sample_rate_hz <= 0 || dst_sample_rate_hz <= 0 ||
num_channels <= 0 || num_channels > 2)
return -1;
src_sample_rate_hz_ = src_sample_rate_hz;
dst_sample_rate_hz_ = dst_sample_rate_hz;
num_channels_ = num_channels;
const size_t src_size_10ms_mono =
static_cast<size_t>(src_sample_rate_hz / 100);
const size_t dst_size_10ms_mono =
static_cast<size_t>(dst_sample_rate_hz / 100);
sinc_resampler_.reset(new PushSincResampler(src_size_10ms_mono,
dst_size_10ms_mono));
if (num_channels_ == 2) {
src_left_.reset(new T[src_size_10ms_mono]);
src_right_.reset(new T[src_size_10ms_mono]);
dst_left_.reset(new T[dst_size_10ms_mono]);
dst_right_.reset(new T[dst_size_10ms_mono]);
sinc_resampler_right_.reset(new PushSincResampler(src_size_10ms_mono,
dst_size_10ms_mono));
}
return 0;
}
template <typename T>
int PushResampler<T>::Resample(const T* src, size_t src_length, T* dst,
size_t dst_capacity) {
const size_t src_size_10ms =
static_cast<size_t>(src_sample_rate_hz_ * num_channels_ / 100);
const size_t dst_size_10ms =
static_cast<size_t>(dst_sample_rate_hz_ * num_channels_ / 100);
if (src_length != src_size_10ms || dst_capacity < dst_size_10ms)
return -1;
if (src_sample_rate_hz_ == dst_sample_rate_hz_) {
// The old resampler provides this memcpy facility in the case of matching
// sample rates, so reproduce it here for the sinc resampler.
memcpy(dst, src, src_length * sizeof(T));
return static_cast<int>(src_length);
}
if (num_channels_ == 2) {
const size_t src_length_mono = src_length / num_channels_;
const size_t dst_capacity_mono = dst_capacity / num_channels_;
T* deinterleaved[] = {src_left_.get(), src_right_.get()};
Deinterleave(src, src_length_mono, num_channels_, deinterleaved);
size_t dst_length_mono =
sinc_resampler_->Resample(src_left_.get(), src_length_mono,
dst_left_.get(), dst_capacity_mono);
sinc_resampler_right_->Resample(src_right_.get(), src_length_mono,
dst_right_.get(), dst_capacity_mono);
deinterleaved[0] = dst_left_.get();
deinterleaved[1] = dst_right_.get();
Interleave(deinterleaved, dst_length_mono, num_channels_, dst);
return static_cast<int>(dst_length_mono * num_channels_);
} else {
return static_cast<int>(
sinc_resampler_->Resample(src, src_length, dst, dst_capacity));
}
}
// Explictly generate required instantiations.
template class PushResampler<int16_t>;
template class PushResampler<float>;
} // namespace webrtc
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