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1 /* | 1 /* |
2 * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2015 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/sparse_fir_filter.h" | 11 #include "webrtc/common_audio/sparse_fir_filter.h" |
12 | 12 |
13 #include "webrtc/base/checks.h" | 13 #include "webrtc/base/checks.h" |
14 | 14 |
15 namespace webrtc { | 15 namespace webrtc { |
16 | 16 |
17 SparseFIRFilter::SparseFIRFilter(const float* nonzero_coeffs, | 17 SparseFIRFilter::SparseFIRFilter(const float* nonzero_coeffs, |
18 size_t num_nonzero_coeffs, | 18 size_t num_nonzero_coeffs, |
19 size_t sparsity, | 19 size_t sparsity, |
20 size_t offset) | 20 size_t offset) |
21 : sparsity_(sparsity), | 21 : sparsity_(sparsity), |
22 offset_(offset), | 22 offset_(offset), |
23 nonzero_coeffs_(nonzero_coeffs, nonzero_coeffs + num_nonzero_coeffs), | 23 nonzero_coeffs_(nonzero_coeffs, nonzero_coeffs + num_nonzero_coeffs), |
24 state_(sparsity_ * (num_nonzero_coeffs - 1) + offset_, 0.f) { | 24 state_(sparsity_ * (num_nonzero_coeffs - 1) + offset_, 0.f) { |
25 RTC_CHECK_GE(num_nonzero_coeffs, 1u); | 25 RTC_CHECK_GE(num_nonzero_coeffs, 1); |
26 RTC_CHECK_GE(sparsity, 1u); | 26 RTC_CHECK_GE(sparsity, 1); |
27 } | 27 } |
28 | 28 |
29 SparseFIRFilter::~SparseFIRFilter() = default; | 29 SparseFIRFilter::~SparseFIRFilter() = default; |
30 | 30 |
31 void SparseFIRFilter::Filter(const float* in, size_t length, float* out) { | 31 void SparseFIRFilter::Filter(const float* in, size_t length, float* out) { |
32 // Convolves the input signal |in| with the filter kernel |nonzero_coeffs_| | 32 // Convolves the input signal |in| with the filter kernel |nonzero_coeffs_| |
33 // taking into account the previous state. | 33 // taking into account the previous state. |
34 for (size_t i = 0; i < length; ++i) { | 34 for (size_t i = 0; i < length; ++i) { |
35 out[i] = 0.f; | 35 out[i] = 0.f; |
36 size_t j; | 36 size_t j; |
(...skipping 16 matching lines...) Expand all Loading... |
53 } else { | 53 } else { |
54 std::memmove(&state_[0], | 54 std::memmove(&state_[0], |
55 &state_[length], | 55 &state_[length], |
56 (state_.size() - length) * sizeof(state_[0])); | 56 (state_.size() - length) * sizeof(state_[0])); |
57 std::memcpy(&state_[state_.size() - length], in, length * sizeof(*in)); | 57 std::memcpy(&state_[state_.size() - length], in, length * sizeof(*in)); |
58 } | 58 } |
59 } | 59 } |
60 } | 60 } |
61 | 61 |
62 } // namespace webrtc | 62 } // namespace webrtc |
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