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TMessagesProj/jni/voip/webrtc/common_audio/vad/vad_gmm.h

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+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Gaussian probability calculations internally used in vad_core.c.
+
+#ifndef COMMON_AUDIO_VAD_VAD_GMM_H_
+#define COMMON_AUDIO_VAD_VAD_GMM_H_
+
+#include <stdint.h>
+
+// Calculates the probability for `input`, given that `input` comes from a
+// normal distribution with mean and standard deviation (`mean`, `std`).
+//
+// Inputs:
+//      - input         : input sample in Q4.
+//      - mean          : mean input in the statistical model, Q7.
+//      - std           : standard deviation, Q7.
+//
+// Output:
+//
+//      - delta         : input used when updating the model, Q11.
+//                        `delta` = (`input` - `mean`) / `std`^2.
+//
+// Return:
+//   (probability for `input`) =
+//    1 / `std` * exp(-(`input` - `mean`)^2 / (2 * `std`^2));
+int32_t WebRtcVad_GaussianProbability(int16_t input,
+                                      int16_t mean,
+                                      int16_t std,
+                                      int16_t* delta);
+
+#endif  // COMMON_AUDIO_VAD_VAD_GMM_H_