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| 1 /* | 1 /* |
| 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2012 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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| 108 data[k * kNumChannels] += offset; | 108 data[k * kNumChannels] += offset; |
| 109 weighted_average += data[k * kNumChannels] * weights[k * kNumChannels]; | 109 weighted_average += data[k * kNumChannels] * weights[k * kNumChannels]; |
| 110 } | 110 } |
| 111 return weighted_average; | 111 return weighted_average; |
| 112 } | 112 } |
| 113 | 113 |
| 114 // An s16 x s32 -> s32 multiplication that's allowed to overflow. (It's still | 114 // An s16 x s32 -> s32 multiplication that's allowed to overflow. (It's still |
| 115 // undefined behavior, so not a good idea; this just makes UBSan ignore the | 115 // undefined behavior, so not a good idea; this just makes UBSan ignore the |
| 116 // violation, so that our old code can continue to do what it's always been | 116 // violation, so that our old code can continue to do what it's always been |
| 117 // doing.) | 117 // doing.) |
| 118 static inline int32_t OverflowingMulS16ByS32ToS32(int16_t a, int32_t b) | 118 static inline int32_t RTC_NO_SANITIZE("signed-integer-overflow") |
| 119 RTC_NO_SANITIZE("signed-integer-overflow") { | 119 OverflowingMulS16ByS32ToS32(int16_t a, int32_t b) { |
| 120 return a * b; | 120 return a * b; |
| 121 } | 121 } |
| 122 | 122 |
| 123 // Calculates the probabilities for both speech and background noise using | 123 // Calculates the probabilities for both speech and background noise using |
| 124 // Gaussian Mixture Models (GMM). A hypothesis-test is performed to decide which | 124 // Gaussian Mixture Models (GMM). A hypothesis-test is performed to decide which |
| 125 // type of signal is most probable. | 125 // type of signal is most probable. |
| 126 // | 126 // |
| 127 // - self [i/o] : Pointer to VAD instance | 127 // - self [i/o] : Pointer to VAD instance |
| 128 // - features [i] : Feature vector of length |kNumChannels| | 128 // - features [i] : Feature vector of length |kNumChannels| |
| 129 // = log10(energy in frequency band) | 129 // = log10(energy in frequency band) |
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| 677 | 677 |
| 678 // Get power in the bands | 678 // Get power in the bands |
| 679 total_power = WebRtcVad_CalculateFeatures(inst, speech_frame, frame_length, | 679 total_power = WebRtcVad_CalculateFeatures(inst, speech_frame, frame_length, |
| 680 feature_vector); | 680 feature_vector); |
| 681 | 681 |
| 682 // Make a VAD | 682 // Make a VAD |
| 683 inst->vad = GmmProbability(inst, feature_vector, total_power, frame_length); | 683 inst->vad = GmmProbability(inst, feature_vector, total_power, frame_length); |
| 684 | 684 |
| 685 return inst->vad; | 685 return inst->vad; |
| 686 } | 686 } |
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