andrew@webrtc.org | 325cff0 | 2014-10-01 17:42:18 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
| 11 | #include "webrtc/common_audio/lapped_transform.h" |
| 12 | |
mgraczyk@chromium.org | e534086 | 2015-03-12 23:23:38 +0000 | [diff] [blame^] | 13 | #include <algorithm> |
andrew@webrtc.org | 325cff0 | 2014-10-01 17:42:18 +0000 | [diff] [blame] | 14 | #include <cstdlib> |
| 15 | #include <cstring> |
| 16 | |
| 17 | #include "webrtc/base/checks.h" |
| 18 | #include "webrtc/common_audio/real_fourier.h" |
| 19 | |
| 20 | namespace webrtc { |
| 21 | |
| 22 | void LappedTransform::BlockThunk::ProcessBlock(const float* const* input, |
| 23 | int num_frames, |
| 24 | int num_input_channels, |
| 25 | int num_output_channels, |
| 26 | float* const* output) { |
| 27 | CHECK_EQ(num_input_channels, parent_->in_channels_); |
| 28 | CHECK_EQ(num_output_channels, parent_->out_channels_); |
| 29 | CHECK_EQ(parent_->block_length_, num_frames); |
| 30 | |
| 31 | for (int i = 0; i < num_input_channels; ++i) { |
| 32 | memcpy(parent_->real_buf_.Row(i), input[i], |
| 33 | num_frames * sizeof(*input[0])); |
| 34 | parent_->fft_.Forward(parent_->real_buf_.Row(i), parent_->cplx_pre_.Row(i)); |
| 35 | } |
| 36 | |
| 37 | int block_length = RealFourier::ComplexLength( |
| 38 | RealFourier::FftOrder(num_frames)); |
| 39 | CHECK_EQ(parent_->cplx_length_, block_length); |
| 40 | parent_->block_processor_->ProcessAudioBlock(parent_->cplx_pre_.Array(), |
| 41 | num_input_channels, |
| 42 | parent_->cplx_length_, |
| 43 | num_output_channels, |
| 44 | parent_->cplx_post_.Array()); |
| 45 | |
| 46 | for (int i = 0; i < num_output_channels; ++i) { |
| 47 | parent_->fft_.Inverse(parent_->cplx_post_.Row(i), |
| 48 | parent_->real_buf_.Row(i)); |
| 49 | memcpy(output[i], parent_->real_buf_.Row(i), |
| 50 | num_frames * sizeof(*input[0])); |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | LappedTransform::LappedTransform(int in_channels, int out_channels, |
| 55 | int chunk_length, const float* window, |
| 56 | int block_length, int shift_amount, |
| 57 | Callback* callback) |
| 58 | : blocker_callback_(this), |
| 59 | in_channels_(in_channels), |
| 60 | out_channels_(out_channels), |
andrew@webrtc.org | 325cff0 | 2014-10-01 17:42:18 +0000 | [diff] [blame] | 61 | block_length_(block_length), |
| 62 | chunk_length_(chunk_length), |
| 63 | block_processor_(callback), |
mgraczyk@chromium.org | e534086 | 2015-03-12 23:23:38 +0000 | [diff] [blame^] | 64 | blocker_( |
| 65 | chunk_length_, block_length_, in_channels_, out_channels_, window, |
| 66 | shift_amount, &blocker_callback_), |
andrew@webrtc.org | 325cff0 | 2014-10-01 17:42:18 +0000 | [diff] [blame] | 67 | fft_(RealFourier::FftOrder(block_length_)), |
| 68 | cplx_length_(RealFourier::ComplexLength(fft_.order())), |
mgraczyk@chromium.org | e534086 | 2015-03-12 23:23:38 +0000 | [diff] [blame^] | 69 | real_buf_(in_channels, block_length_, RealFourier::kFftBufferAlignment), |
andrew@webrtc.org | 325cff0 | 2014-10-01 17:42:18 +0000 | [diff] [blame] | 70 | cplx_pre_(in_channels, cplx_length_, RealFourier::kFftBufferAlignment), |
| 71 | cplx_post_(out_channels, cplx_length_, RealFourier::kFftBufferAlignment) { |
| 72 | CHECK(in_channels_ > 0 && out_channels_ > 0); |
| 73 | CHECK_GT(block_length_, 0); |
| 74 | CHECK_GT(chunk_length_, 0); |
| 75 | CHECK(block_processor_); |
andrew@webrtc.org | 325cff0 | 2014-10-01 17:42:18 +0000 | [diff] [blame] | 76 | |
mgraczyk@chromium.org | e534086 | 2015-03-12 23:23:38 +0000 | [diff] [blame^] | 77 | // block_length_ power of 2? |
| 78 | CHECK_EQ(0, block_length_ & (block_length_ - 1)); |
andrew@webrtc.org | 325cff0 | 2014-10-01 17:42:18 +0000 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | void LappedTransform::ProcessChunk(const float* const* in_chunk, |
| 82 | float* const* out_chunk) { |
mgraczyk@chromium.org | e534086 | 2015-03-12 23:23:38 +0000 | [diff] [blame^] | 83 | blocker_.ProcessChunk(in_chunk, chunk_length_, in_channels_, out_channels_, |
andrew@webrtc.org | 325cff0 | 2014-10-01 17:42:18 +0000 | [diff] [blame] | 84 | out_chunk); |
| 85 | } |
| 86 | |
| 87 | } // namespace webrtc |
| 88 | |