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1 /* | 1 /* |
2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2013 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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85 // MSVC++ requires this to be set before any other includes to get M_PI. | 85 // MSVC++ requires this to be set before any other includes to get M_PI. |
86 #define _USE_MATH_DEFINES | 86 #define _USE_MATH_DEFINES |
87 | 87 |
88 #include "webrtc/common_audio/resampler/sinc_resampler.h" | 88 #include "webrtc/common_audio/resampler/sinc_resampler.h" |
89 | 89 |
90 #include <math.h> | 90 #include <math.h> |
91 #include <string.h> | 91 #include <string.h> |
92 | 92 |
93 #include <limits> | 93 #include <limits> |
94 | 94 |
95 #include "webrtc/base/checks.h" | 95 #include "webrtc/rtc_base/checks.h" |
96 #include "webrtc/system_wrappers/include/cpu_features_wrapper.h" | 96 #include "webrtc/system_wrappers/include/cpu_features_wrapper.h" |
97 #include "webrtc/typedefs.h" | 97 #include "webrtc/typedefs.h" |
98 | 98 |
99 namespace webrtc { | 99 namespace webrtc { |
100 | 100 |
101 namespace { | 101 namespace { |
102 | 102 |
103 double SincScaleFactor(double io_ratio) { | 103 double SincScaleFactor(double io_ratio) { |
104 // |sinc_scale_factor| is basically the normalized cutoff frequency of the | 104 // |sinc_scale_factor| is basically the normalized cutoff frequency of the |
105 // low-pass filter. | 105 // low-pass filter. |
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365 sum1 += *input_ptr * *k1++; | 365 sum1 += *input_ptr * *k1++; |
366 sum2 += *input_ptr++ * *k2++; | 366 sum2 += *input_ptr++ * *k2++; |
367 } | 367 } |
368 | 368 |
369 // Linearly interpolate the two "convolutions". | 369 // Linearly interpolate the two "convolutions". |
370 return static_cast<float>((1.0 - kernel_interpolation_factor) * sum1 + | 370 return static_cast<float>((1.0 - kernel_interpolation_factor) * sum1 + |
371 kernel_interpolation_factor * sum2); | 371 kernel_interpolation_factor * sum2); |
372 } | 372 } |
373 | 373 |
374 } // namespace webrtc | 374 } // namespace webrtc |
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