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| 1 /* | 1 /* |
| 2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. |
| 3 * | 3 * |
| 4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ | 9 */ |
| 10 | 10 |
| 11 #include "webrtc/common_audio/blocker.h" | 11 #include "webrtc/modules/audio_processing/utility/blocker.h" |
| 12 | 12 |
| 13 #include <string.h> | 13 #include <string.h> |
| 14 | 14 |
| 15 #include "webrtc/base/checks.h" | 15 #include "webrtc/base/checks.h" |
| 16 | 16 |
| 17 namespace { | 17 namespace { |
| 18 | 18 |
| 19 // Adds |a| and |b| frame by frame into |result| (basically matrix addition). | 19 // Adds |a| and |b| frame by frame into |result| (basically matrix addition). |
| 20 void AddFrames(const float* const* a, | 20 void AddFrames(const float* const* a, |
| 21 size_t a_start_index, | 21 size_t a_start_index, |
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| 34 } | 34 } |
| 35 | 35 |
| 36 // Copies |src| into |dst| channel by channel. | 36 // Copies |src| into |dst| channel by channel. |
| 37 void CopyFrames(const float* const* src, | 37 void CopyFrames(const float* const* src, |
| 38 size_t src_start_index, | 38 size_t src_start_index, |
| 39 size_t num_frames, | 39 size_t num_frames, |
| 40 size_t num_channels, | 40 size_t num_channels, |
| 41 float* const* dst, | 41 float* const* dst, |
| 42 size_t dst_start_index) { | 42 size_t dst_start_index) { |
| 43 for (size_t i = 0; i < num_channels; ++i) { | 43 for (size_t i = 0; i < num_channels; ++i) { |
| 44 memcpy(&dst[i][dst_start_index], | 44 memcpy(&dst[i][dst_start_index], &src[i][src_start_index], |
| 45 &src[i][src_start_index], | |
| 46 num_frames * sizeof(dst[i][dst_start_index])); | 45 num_frames * sizeof(dst[i][dst_start_index])); |
| 47 } | 46 } |
| 48 } | 47 } |
| 49 | 48 |
| 50 // Moves |src| into |dst| channel by channel. | 49 // Moves |src| into |dst| channel by channel. |
| 51 void MoveFrames(const float* const* src, | 50 void MoveFrames(const float* const* src, |
| 52 size_t src_start_index, | 51 size_t src_start_index, |
| 53 size_t num_frames, | 52 size_t num_frames, |
| 54 size_t num_channels, | 53 size_t num_channels, |
| 55 float* const* dst, | 54 float* const* dst, |
| 56 size_t dst_start_index) { | 55 size_t dst_start_index) { |
| 57 for (size_t i = 0; i < num_channels; ++i) { | 56 for (size_t i = 0; i < num_channels; ++i) { |
| 58 memmove(&dst[i][dst_start_index], | 57 memmove(&dst[i][dst_start_index], &src[i][src_start_index], |
| 59 &src[i][src_start_index], | |
| 60 num_frames * sizeof(dst[i][dst_start_index])); | 58 num_frames * sizeof(dst[i][dst_start_index])); |
| 61 } | 59 } |
| 62 } | 60 } |
| 63 | 61 |
| 64 void ZeroOut(float* const* buffer, | 62 void ZeroOut(float* const* buffer, |
| 65 size_t starting_idx, | 63 size_t starting_idx, |
| 66 size_t num_frames, | 64 size_t num_frames, |
| 67 size_t num_channels) { | 65 size_t num_channels) { |
| 68 for (size_t i = 0; i < num_channels; ++i) { | 66 for (size_t i = 0; i < num_channels; ++i) { |
| 69 memset(&buffer[i][starting_idx], 0, | 67 memset(&buffer[i][starting_idx], 0, |
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| 80 for (size_t i = 0; i < num_channels; ++i) { | 78 for (size_t i = 0; i < num_channels; ++i) { |
| 81 for (size_t j = 0; j < num_frames; ++j) { | 79 for (size_t j = 0; j < num_frames; ++j) { |
| 82 frames[i][j] = frames[i][j] * window[j]; | 80 frames[i][j] = frames[i][j] * window[j]; |
| 83 } | 81 } |
| 84 } | 82 } |
| 85 } | 83 } |
| 86 | 84 |
| 87 size_t gcd(size_t a, size_t b) { | 85 size_t gcd(size_t a, size_t b) { |
| 88 size_t tmp; | 86 size_t tmp; |
| 89 while (b) { | 87 while (b) { |
| 90 tmp = a; | 88 tmp = a; |
| 91 a = b; | 89 a = b; |
| 92 b = tmp % b; | 90 b = tmp % b; |
| 93 } | 91 } |
| 94 return a; | 92 return a; |
| 95 } | 93 } |
| 96 | 94 |
| 97 } // namespace | 95 } // namespace |
| 98 | 96 |
| 99 namespace webrtc { | 97 namespace webrtc { |
| 100 | 98 |
| 101 Blocker::Blocker(size_t chunk_size, | 99 Blocker::Blocker(size_t chunk_size, |
| 102 size_t block_size, | 100 size_t block_size, |
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| 175 | 173 |
| 176 input_buffer_.Write(input, num_input_channels, chunk_size_); | 174 input_buffer_.Write(input, num_input_channels, chunk_size_); |
| 177 size_t first_frame_in_block = frame_offset_; | 175 size_t first_frame_in_block = frame_offset_; |
| 178 | 176 |
| 179 // Loop through blocks. | 177 // Loop through blocks. |
| 180 while (first_frame_in_block < chunk_size_) { | 178 while (first_frame_in_block < chunk_size_) { |
| 181 input_buffer_.Read(input_block_.channels(), num_input_channels, | 179 input_buffer_.Read(input_block_.channels(), num_input_channels, |
| 182 block_size_); | 180 block_size_); |
| 183 input_buffer_.MoveReadPositionBackward(block_size_ - shift_amount_); | 181 input_buffer_.MoveReadPositionBackward(block_size_ - shift_amount_); |
| 184 | 182 |
| 185 ApplyWindow(window_.get(), | 183 ApplyWindow(window_.get(), block_size_, num_input_channels_, |
| 186 block_size_, | |
| 187 num_input_channels_, | |
| 188 input_block_.channels()); | 184 input_block_.channels()); |
| 189 callback_->ProcessBlock(input_block_.channels(), | 185 callback_->ProcessBlock(input_block_.channels(), block_size_, |
| 190 block_size_, | 186 num_input_channels_, num_output_channels_, |
| 191 num_input_channels_, | |
| 192 num_output_channels_, | |
| 193 output_block_.channels()); | 187 output_block_.channels()); |
| 194 ApplyWindow(window_.get(), | 188 ApplyWindow(window_.get(), block_size_, num_output_channels_, |
| 195 block_size_, | |
| 196 num_output_channels_, | |
| 197 output_block_.channels()); | 189 output_block_.channels()); |
| 198 | 190 |
| 199 AddFrames(output_buffer_.channels(), | 191 AddFrames(output_buffer_.channels(), first_frame_in_block, |
| 200 first_frame_in_block, | 192 output_block_.channels(), 0, block_size_, num_output_channels_, |
| 201 output_block_.channels(), | 193 output_buffer_.channels(), first_frame_in_block); |
| 202 0, | |
| 203 block_size_, | |
| 204 num_output_channels_, | |
| 205 output_buffer_.channels(), | |
| 206 first_frame_in_block); | |
| 207 | 194 |
| 208 first_frame_in_block += shift_amount_; | 195 first_frame_in_block += shift_amount_; |
| 209 } | 196 } |
| 210 | 197 |
| 211 // Copy output buffer to output | 198 // Copy output buffer to output |
| 212 CopyFrames(output_buffer_.channels(), | 199 CopyFrames(output_buffer_.channels(), 0, chunk_size_, num_output_channels_, |
| 213 0, | 200 output, 0); |
| 214 chunk_size_, | |
| 215 num_output_channels_, | |
| 216 output, | |
| 217 0); | |
| 218 | 201 |
| 219 // Copy output buffer [chunk_size_, chunk_size_ + initial_delay] | 202 // Copy output buffer [chunk_size_, chunk_size_ + initial_delay] |
| 220 // to output buffer [0, initial_delay], zero the rest. | 203 // to output buffer [0, initial_delay], zero the rest. |
| 221 MoveFrames(output_buffer_.channels(), | 204 MoveFrames(output_buffer_.channels(), chunk_size, initial_delay_, |
| 222 chunk_size, | 205 num_output_channels_, output_buffer_.channels(), 0); |
| 223 initial_delay_, | 206 ZeroOut(output_buffer_.channels(), initial_delay_, chunk_size_, |
| 224 num_output_channels_, | |
| 225 output_buffer_.channels(), | |
| 226 0); | |
| 227 ZeroOut(output_buffer_.channels(), | |
| 228 initial_delay_, | |
| 229 chunk_size_, | |
| 230 num_output_channels_); | 207 num_output_channels_); |
| 231 | 208 |
| 232 // Calculate new starting frames. | 209 // Calculate new starting frames. |
| 233 frame_offset_ = first_frame_in_block - chunk_size_; | 210 frame_offset_ = first_frame_in_block - chunk_size_; |
| 234 } | 211 } |
| 235 | 212 |
| 236 } // namespace webrtc | 213 } // namespace webrtc |
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