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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 |
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23 class SparseFIRFilter final { | 23 class SparseFIRFilter final { |
24 public: | 24 public: |
25 // |num_nonzero_coeffs| is the number of non-zero coefficients, | 25 // |num_nonzero_coeffs| is the number of non-zero coefficients, |
26 // |nonzero_coeffs|. They are assumed to be uniformly distributed every | 26 // |nonzero_coeffs|. They are assumed to be uniformly distributed every |
27 // |sparsity| samples and with an initial |offset|. The rest of the filter | 27 // |sparsity| samples and with an initial |offset|. The rest of the filter |
28 // coefficients will be assumed zeros. For example, with sparsity = 3, and | 28 // coefficients will be assumed zeros. For example, with sparsity = 3, and |
29 // offset = 1 the filter coefficients will be: | 29 // offset = 1 the filter coefficients will be: |
30 // B = [0 coeffs[0] 0 0 coeffs[1] 0 0 coeffs[2] ... ] | 30 // B = [0 coeffs[0] 0 0 coeffs[1] 0 0 coeffs[2] ... ] |
31 // All initial state values will be zeros. | 31 // All initial state values will be zeros. |
32 SparseFIRFilter(const float* nonzero_coeffs, | 32 SparseFIRFilter(const float* nonzero_coeffs, |
33 int num_nonzero_coeffs, | 33 size_t num_nonzero_coeffs, |
34 int sparsity, | 34 size_t sparsity, |
35 int offset); | 35 size_t offset); |
36 | 36 |
37 // Filters the |in| data supplied. | 37 // Filters the |in| data supplied. |
38 // |out| must be previously allocated and it must be at least of |length|. | 38 // |out| must be previously allocated and it must be at least of |length|. |
39 void Filter(const float* in, int length, float* out); | 39 void Filter(const float* in, size_t length, float* out); |
40 | 40 |
41 private: | 41 private: |
42 const int sparsity_; | 42 const size_t sparsity_; |
43 const int offset_; | 43 const size_t offset_; |
44 const std::vector<float> nonzero_coeffs_; | 44 const std::vector<float> nonzero_coeffs_; |
45 std::vector<float> state_; | 45 std::vector<float> state_; |
46 | 46 |
47 DISALLOW_COPY_AND_ASSIGN(SparseFIRFilter); | 47 DISALLOW_COPY_AND_ASSIGN(SparseFIRFilter); |
48 }; | 48 }; |
49 | 49 |
50 } // namespace webrtc | 50 } // namespace webrtc |
51 | 51 |
52 #endif // WEBRTC_COMMON_AUDIO_SPARSE_FIR_FILTER_H_ | 52 #endif // WEBRTC_COMMON_AUDIO_SPARSE_FIR_FILTER_H_ |
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