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Unified Diff: webrtc/modules/audio_processing/agc/gmm.cc

Issue 1212543002: Pull the Voice Activity Detector out from the AGC (Closed) Base URL: https://chromium.googlesource.com/external/webrtc.git@master
Patch Set: Created 5 years, 6 months ago
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Index: webrtc/modules/audio_processing/agc/gmm.cc
diff --git a/webrtc/modules/audio_processing/agc/gmm.cc b/webrtc/modules/audio_processing/agc/gmm.cc
deleted file mode 100644
index 9ad8ef95aee23baac501f1d8e9ca3e5e77fd6dd4..0000000000000000000000000000000000000000
--- a/webrtc/modules/audio_processing/agc/gmm.cc
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * Copyright (c) 2012 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.
- */
-
-#include "webrtc/modules/audio_processing/agc/gmm.h"
-
-#include <math.h>
-#include <stdlib.h>
-
-#include "webrtc/typedefs.h"
-
-namespace webrtc {
-
-static const int kMaxDimension = 10;
-
-static void RemoveMean(const double* in, const double* mean_vec,
- int dimension, double* out) {
- for (int n = 0; n < dimension; ++n)
- out[n] = in[n] - mean_vec[n];
-}
-
-static double ComputeExponent(const double* in, const double* covar_inv,
- int dimension) {
- double q = 0;
- for (int i = 0; i < dimension; ++i) {
- double v = 0;
- for (int j = 0; j < dimension; j++)
- v += (*covar_inv++) * in[j];
- q += v * in[i];
- }
- q *= -0.5;
- return q;
-}
-
-double EvaluateGmm(const double* x, const GmmParameters& gmm_parameters) {
- if (gmm_parameters.dimension > kMaxDimension) {
- return -1; // This is invalid pdf so the caller can check this.
- }
- double f = 0;
- double v[kMaxDimension];
- const double* mean_vec = gmm_parameters.mean;
- const double* covar_inv = gmm_parameters.covar_inverse;
-
- for (int n = 0; n < gmm_parameters.num_mixtures; n++) {
- RemoveMean(x, mean_vec, gmm_parameters.dimension, v);
- double q = ComputeExponent(v, covar_inv, gmm_parameters.dimension) +
- gmm_parameters.weight[n];
- f += exp(q);
- mean_vec += gmm_parameters.dimension;
- covar_inv += gmm_parameters.dimension * gmm_parameters.dimension;
- }
- return f;
-}
-
-} // namespace webrtc

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