e534086492
- Remove unnecessary window member from lapped_transform.
- Add comment indicated that Blocker does not take ownership of
the window passed to its constructor.
- Streamline LappedTransform constructor so members can be const.
Also use a range-based for loop in audio_processing_impl.cc for clarity.
R=aluebs@webrtc.org, andrew@webrtc.org
Review URL: https://webrtc-codereview.appspot.com/41229004
Cr-Commit-Position: refs/heads/master@{#8708}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8708 4adac7df-926f-26a2-2b94-8c16560cd09d
89 lines
3.5 KiB
C++
89 lines
3.5 KiB
C++
/*
|
|
* Copyright (c) 2014 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/lapped_transform.h"
|
|
|
|
#include <algorithm>
|
|
#include <cstdlib>
|
|
#include <cstring>
|
|
|
|
#include "webrtc/base/checks.h"
|
|
#include "webrtc/common_audio/real_fourier.h"
|
|
|
|
namespace webrtc {
|
|
|
|
void LappedTransform::BlockThunk::ProcessBlock(const float* const* input,
|
|
int num_frames,
|
|
int num_input_channels,
|
|
int num_output_channels,
|
|
float* const* output) {
|
|
CHECK_EQ(num_input_channels, parent_->in_channels_);
|
|
CHECK_EQ(num_output_channels, parent_->out_channels_);
|
|
CHECK_EQ(parent_->block_length_, num_frames);
|
|
|
|
for (int i = 0; i < num_input_channels; ++i) {
|
|
memcpy(parent_->real_buf_.Row(i), input[i],
|
|
num_frames * sizeof(*input[0]));
|
|
parent_->fft_.Forward(parent_->real_buf_.Row(i), parent_->cplx_pre_.Row(i));
|
|
}
|
|
|
|
int block_length = RealFourier::ComplexLength(
|
|
RealFourier::FftOrder(num_frames));
|
|
CHECK_EQ(parent_->cplx_length_, block_length);
|
|
parent_->block_processor_->ProcessAudioBlock(parent_->cplx_pre_.Array(),
|
|
num_input_channels,
|
|
parent_->cplx_length_,
|
|
num_output_channels,
|
|
parent_->cplx_post_.Array());
|
|
|
|
for (int i = 0; i < num_output_channels; ++i) {
|
|
parent_->fft_.Inverse(parent_->cplx_post_.Row(i),
|
|
parent_->real_buf_.Row(i));
|
|
memcpy(output[i], parent_->real_buf_.Row(i),
|
|
num_frames * sizeof(*input[0]));
|
|
}
|
|
}
|
|
|
|
LappedTransform::LappedTransform(int in_channels, int out_channels,
|
|
int chunk_length, const float* window,
|
|
int block_length, int shift_amount,
|
|
Callback* callback)
|
|
: blocker_callback_(this),
|
|
in_channels_(in_channels),
|
|
out_channels_(out_channels),
|
|
block_length_(block_length),
|
|
chunk_length_(chunk_length),
|
|
block_processor_(callback),
|
|
blocker_(
|
|
chunk_length_, block_length_, in_channels_, out_channels_, window,
|
|
shift_amount, &blocker_callback_),
|
|
fft_(RealFourier::FftOrder(block_length_)),
|
|
cplx_length_(RealFourier::ComplexLength(fft_.order())),
|
|
real_buf_(in_channels, block_length_, RealFourier::kFftBufferAlignment),
|
|
cplx_pre_(in_channels, cplx_length_, RealFourier::kFftBufferAlignment),
|
|
cplx_post_(out_channels, cplx_length_, RealFourier::kFftBufferAlignment) {
|
|
CHECK(in_channels_ > 0 && out_channels_ > 0);
|
|
CHECK_GT(block_length_, 0);
|
|
CHECK_GT(chunk_length_, 0);
|
|
CHECK(block_processor_);
|
|
|
|
// block_length_ power of 2?
|
|
CHECK_EQ(0, block_length_ & (block_length_ - 1));
|
|
}
|
|
|
|
void LappedTransform::ProcessChunk(const float* const* in_chunk,
|
|
float* const* out_chunk) {
|
|
blocker_.ProcessChunk(in_chunk, chunk_length_, in_channels_, out_channels_,
|
|
out_chunk);
|
|
}
|
|
|
|
} // namespace webrtc
|
|
|