Pull the Voice Activity Detector out from the AGC

webrtc/modules/audio_processing/agc/circular_buffer_unittest.cc

-/*
- *  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/circular_buffer.h"
-
-#include <stdio.h>
-
-#include "testing/gtest/include/gtest/gtest.h"
-#include "webrtc/base/scoped_ptr.h"
-
-namespace webrtc {
-
-static const int kWidthThreshold = 7;
-static const double kValThreshold = 1.0;
-static const int kLongBuffSize = 100;
-static const int kShortBuffSize = 10;
-
-static void InsertSequentially(int k, AgcCircularBuffer* circular_buffer) {
-  double mean_val;
-  for (int n = 1; n <= k; n++) {
-    EXPECT_TRUE(!circular_buffer->is_full());
-    circular_buffer->Insert(n);
-    mean_val = circular_buffer->Mean();
-    EXPECT_EQ((n + 1.0) / 2., mean_val);
-  }
-}
-
-static void Insert(double value, int num_insertion,
-                   AgcCircularBuffer* circular_buffer) {
-  for (int n = 0; n < num_insertion; n++)
-    circular_buffer->Insert(value);
-}
-
-static void InsertZeros(int num_zeros, AgcCircularBuffer* circular_buffer) {
-  Insert(0.0, num_zeros, circular_buffer);
-}
-
-TEST(AgcCircularBufferTest, GeneralTest) {
-  rtc::scoped_ptr<AgcCircularBuffer> circular_buffer(
-      AgcCircularBuffer::Create(kShortBuffSize));
-  double mean_val;
-
-  // Mean should return zero if nothing is inserted.
-  mean_val = circular_buffer->Mean();
-  EXPECT_DOUBLE_EQ(0.0, mean_val);
-  InsertSequentially(kShortBuffSize, circular_buffer.get());
-
-  // Should be full.
-  EXPECT_TRUE(circular_buffer->is_full());
-  // Correct update after being full.
-  for (int n = 1; n < kShortBuffSize; n++) {
-    circular_buffer->Insert(n);
-    mean_val = circular_buffer->Mean();
-    EXPECT_DOUBLE_EQ((kShortBuffSize + 1.) / 2., mean_val);
-    EXPECT_TRUE(circular_buffer->is_full());
-  }
-
-  // Check reset. This should be like starting fresh.
-  circular_buffer->Reset();
-  mean_val = circular_buffer->Mean();
-  EXPECT_DOUBLE_EQ(0, mean_val);
-  InsertSequentially(kShortBuffSize, circular_buffer.get());
-  EXPECT_TRUE(circular_buffer->is_full());
-}
-
-TEST(AgcCircularBufferTest, TransientsRemoval) {
-  rtc::scoped_ptr<AgcCircularBuffer> circular_buffer(
-      AgcCircularBuffer::Create(kLongBuffSize));
-  // Let the first transient be in wrap-around.
-  InsertZeros(kLongBuffSize - kWidthThreshold / 2, circular_buffer.get());
-
-  double push_val = kValThreshold;
-  double mean_val;
-  for (int k = kWidthThreshold; k >= 1; k--) {
-    Insert(push_val, k, circular_buffer.get());
-    circular_buffer->Insert(0);
-    mean_val = circular_buffer->Mean();
-    EXPECT_DOUBLE_EQ(k * push_val / kLongBuffSize, mean_val);
-    circular_buffer->RemoveTransient(kWidthThreshold, kValThreshold);
-    mean_val = circular_buffer->Mean();
-    EXPECT_DOUBLE_EQ(0, mean_val);
-  }
-}
-
-TEST(AgcCircularBufferTest, TransientDetection) {
-  rtc::scoped_ptr<AgcCircularBuffer> circular_buffer(
-      AgcCircularBuffer::Create(kLongBuffSize));
-  // Let the first transient be in wrap-around.
-  int num_insertion = kLongBuffSize - kWidthThreshold / 2;
-  InsertZeros(num_insertion, circular_buffer.get());
-
-  double push_val = 2;
-  // This is longer than a transient and shouldn't be removed.
-  int num_non_zero_elements = kWidthThreshold + 1;
-  Insert(push_val, num_non_zero_elements, circular_buffer.get());
-
-  double mean_val = circular_buffer->Mean();
-  EXPECT_DOUBLE_EQ(num_non_zero_elements * push_val / kLongBuffSize, mean_val);
-  circular_buffer->Insert(0);
-  EXPECT_EQ(0, circular_buffer->RemoveTransient(kWidthThreshold,
-                                                kValThreshold));
-  mean_val = circular_buffer->Mean();
-  EXPECT_DOUBLE_EQ(num_non_zero_elements * push_val / kLongBuffSize, mean_val);
-
-  // A transient right after a non-transient, should be removed and mean is
-  // not changed.
-  num_insertion = 3;
-  Insert(push_val, num_insertion, circular_buffer.get());
-  circular_buffer->Insert(0);
-  EXPECT_EQ(0, circular_buffer->RemoveTransient(kWidthThreshold,
-                                                kValThreshold));
-  mean_val = circular_buffer->Mean();
-  EXPECT_DOUBLE_EQ(num_non_zero_elements * push_val / kLongBuffSize, mean_val);
-
-  // Last input is larger than threshold, although the sequence is short but
-  // it shouldn't be considered transient.
-  Insert(push_val, num_insertion, circular_buffer.get());
-  num_non_zero_elements += num_insertion;
-  EXPECT_EQ(0, circular_buffer->RemoveTransient(kWidthThreshold,
-                                                kValThreshold));
-  mean_val = circular_buffer->Mean();
-  EXPECT_DOUBLE_EQ(num_non_zero_elements * push_val / kLongBuffSize, mean_val);
-}
-
-}  // namespace webrtc