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Unified Diff: webrtc/modules/audio_processing/vad/pitch_internal.cc

Issue 1192863006: Revert "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/vad/pitch_internal.cc
diff --git a/webrtc/modules/audio_processing/vad/pitch_internal.cc b/webrtc/modules/audio_processing/vad/pitch_internal.cc
deleted file mode 100644
index 309b45acf5362ec13eb376319b992893a3686b05..0000000000000000000000000000000000000000
--- a/webrtc/modules/audio_processing/vad/pitch_internal.cc
+++ /dev/null
@@ -1,51 +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/vad/pitch_internal.h"
-
-#include <cmath>
-
-// A 4-to-3 linear interpolation.
-// The interpolation constants are derived as following:
-// Input pitch parameters are updated every 7.5 ms. Within a 30-ms interval
-// we are interested in pitch parameters of 0-5 ms, 10-15ms and 20-25ms. This is
-// like interpolating 4-to-6 and keep the odd samples.
-// The reason behind this is that LPC coefficients are computed for the first
-// half of each 10ms interval.
-static void PitchInterpolation(double old_val, const double* in, double* out) {
- out[0] = 1. / 6. * old_val + 5. / 6. * in[0];
- out[1] = 5. / 6. * in[1] + 1. / 6. * in[2];
- out[2] = 0.5 * in[2] + 0.5 * in[3];
-}
-
-void GetSubframesPitchParameters(int sampling_rate_hz,
- double* gains,
- double* lags,
- int num_in_frames,
- int num_out_frames,
- double* log_old_gain,
- double* old_lag,
- double* log_pitch_gain,
- double* pitch_lag_hz) {
- // Gain interpolation is in log-domain, also returned in log-domain.
- for (int n = 0; n < num_in_frames; n++)
- gains[n] = log(gains[n] + 1e-12);
-
- // Interpolate lags and gains.
- PitchInterpolation(*log_old_gain, gains, log_pitch_gain);
- *log_old_gain = gains[num_in_frames - 1];
- PitchInterpolation(*old_lag, lags, pitch_lag_hz);
- *old_lag = lags[num_in_frames - 1];
-
- // Convert pitch-lags to Hertz.
- for (int n = 0; n < num_out_frames; n++) {
- pitch_lag_hz[n] = (sampling_rate_hz) / (pitch_lag_hz[n]);
- }
-}
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