102 lines
3.9 KiB
C++
102 lines
3.9 KiB
C++
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/*
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* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/common_audio/lapped_transform.h"
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#include <algorithm>
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#include <cstdlib>
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#include <cstring>
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#include "webrtc/base/checks.h"
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#include "webrtc/common_audio/real_fourier.h"
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namespace webrtc {
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void LappedTransform::BlockThunk::ProcessBlock(const float* const* input,
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size_t num_frames,
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size_t num_input_channels,
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size_t num_output_channels,
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float* const* output) {
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RTC_CHECK_EQ(num_input_channels, parent_->num_in_channels_);
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RTC_CHECK_EQ(num_output_channels, parent_->num_out_channels_);
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RTC_CHECK_EQ(parent_->block_length_, num_frames);
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for (size_t i = 0; i < num_input_channels; ++i) {
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memcpy(parent_->real_buf_.Row(i), input[i],
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num_frames * sizeof(*input[0]));
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parent_->fft_->Forward(parent_->real_buf_.Row(i),
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parent_->cplx_pre_.Row(i));
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}
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size_t block_length = RealFourier::ComplexLength(
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RealFourier::FftOrder(num_frames));
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RTC_CHECK_EQ(parent_->cplx_length_, block_length);
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parent_->block_processor_->ProcessAudioBlock(parent_->cplx_pre_.Array(),
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num_input_channels,
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parent_->cplx_length_,
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num_output_channels,
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parent_->cplx_post_.Array());
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for (size_t i = 0; i < num_output_channels; ++i) {
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parent_->fft_->Inverse(parent_->cplx_post_.Row(i),
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parent_->real_buf_.Row(i));
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memcpy(output[i], parent_->real_buf_.Row(i),
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num_frames * sizeof(*input[0]));
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}
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}
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LappedTransform::LappedTransform(size_t num_in_channels,
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size_t num_out_channels,
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size_t chunk_length,
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const float* window,
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size_t block_length,
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size_t shift_amount,
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Callback* callback)
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: blocker_callback_(this),
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num_in_channels_(num_in_channels),
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num_out_channels_(num_out_channels),
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block_length_(block_length),
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chunk_length_(chunk_length),
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block_processor_(callback),
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blocker_(chunk_length_,
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block_length_,
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num_in_channels_,
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num_out_channels_,
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window,
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shift_amount,
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&blocker_callback_),
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fft_(RealFourier::Create(RealFourier::FftOrder(block_length_))),
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cplx_length_(RealFourier::ComplexLength(fft_->order())),
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real_buf_(num_in_channels,
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block_length_,
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RealFourier::kFftBufferAlignment),
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cplx_pre_(num_in_channels,
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cplx_length_,
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RealFourier::kFftBufferAlignment),
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cplx_post_(num_out_channels,
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cplx_length_,
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RealFourier::kFftBufferAlignment) {
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RTC_CHECK(num_in_channels_ > 0 && num_out_channels_ > 0);
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RTC_CHECK_GT(block_length_, 0u);
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RTC_CHECK_GT(chunk_length_, 0u);
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RTC_CHECK(block_processor_);
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// block_length_ power of 2?
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RTC_CHECK_EQ(0u, block_length_ & (block_length_ - 1));
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}
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void LappedTransform::ProcessChunk(const float* const* in_chunk,
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float* const* out_chunk) {
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blocker_.ProcessChunk(in_chunk, chunk_length_, num_in_channels_,
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num_out_channels_, out_chunk);
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}
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} // namespace webrtc
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