Pull the Voice Activity Detector out from the AGC

webrtc/modules/audio_processing/agc/standalone_vad_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/standalone_vad.h"
-
-#include <string.h>
-
-#include "gtest/gtest.h"
-#include "webrtc/base/scoped_ptr.h"
-#include "webrtc/modules/interface/module_common_types.h"
-#include "webrtc/test/testsupport/fileutils.h"
-
-namespace webrtc {
-
-TEST(StandaloneVadTest, Api) {
-  rtc::scoped_ptr<StandaloneVad> vad(StandaloneVad::Create());
-  int16_t data[kLength10Ms] = { 0 };
-
-  // Valid frame length (for 32 kHz rate), but not what the VAD is expecting.
-  EXPECT_EQ(-1, vad->AddAudio(data, 320));
-
-  const int kMaxNumFrames = 3;
-  double p[kMaxNumFrames];
-  for (int n = 0; n < kMaxNumFrames; n++)
-    EXPECT_EQ(0, vad->AddAudio(data, kLength10Ms));
-
-  // Pretend |p| is shorter that it should be.
-  EXPECT_EQ(-1, vad->GetActivity(p, kMaxNumFrames - 1));
-
-  EXPECT_EQ(0, vad->GetActivity(p, kMaxNumFrames));
-
-  // Ask for activity when buffer is empty.
-  EXPECT_EQ(-1, vad->GetActivity(p, kMaxNumFrames));
-
-  // Should reset and result in one buffer.
-  for (int n = 0; n < kMaxNumFrames + 1; n++)
-    EXPECT_EQ(0, vad->AddAudio(data, kLength10Ms));
-  EXPECT_EQ(0, vad->GetActivity(p, 1));
-
-  // Wrong modes
-  EXPECT_EQ(-1, vad->set_mode(-1));
-  EXPECT_EQ(-1, vad->set_mode(4));
-
-  // Valid mode.
-  const int kMode = 2;
-  EXPECT_EQ(0, vad->set_mode(kMode));
-  EXPECT_EQ(kMode, vad->mode());
-}
-
-TEST(StandaloneVadTest, ActivityDetection) {
-  rtc::scoped_ptr<StandaloneVad> vad(StandaloneVad::Create());
-  const size_t kDataLength = kLength10Ms;
-  int16_t data[kDataLength] = { 0 };
-
-  FILE* pcm_file =
-      fopen(test::ResourcePath("audio_processing/agc/agc_audio", "pcm").c_str(),
-            "rb");
-  ASSERT_TRUE(pcm_file != NULL);
-
-  FILE* reference_file = fopen(
-      test::ResourcePath("audio_processing/agc/agc_vad", "dat").c_str(), "rb");
-  ASSERT_TRUE(reference_file != NULL);
-
-  // Reference activities are prepared with 0 aggressiveness.
-  ASSERT_EQ(0, vad->set_mode(0));
-
-  // Stand-alone VAD can operate on 1, 2 or 3 frames of length 10 ms. The
-  // reference file is created for 30 ms frame.
-  const int kNumVadFramesToProcess = 3;
-  int num_frames = 0;
-  while (fread(data, sizeof(int16_t), kDataLength, pcm_file) == kDataLength) {
-    vad->AddAudio(data, kDataLength);
-    num_frames++;
-    if (num_frames == kNumVadFramesToProcess) {
-      num_frames = 0;
-      int referece_activity;
-      double p[kNumVadFramesToProcess];
-      EXPECT_EQ(1u, fread(&referece_activity, sizeof(referece_activity), 1,
-                          reference_file));
-      int activity = vad->GetActivity(p, kNumVadFramesToProcess);
-      EXPECT_EQ(referece_activity, activity);
-      if (activity != 0) {
-        // When active, probabilities are set to 0.5.
-        for (int n = 0; n < kNumVadFramesToProcess; n++)
-          EXPECT_EQ(0.5, p[n]);
-      } else {
-        // When inactive, probabilities are set to 0.01.
-        for (int n = 0; n < kNumVadFramesToProcess; n++)
-          EXPECT_EQ(0.01, p[n]);
-      }
-    }
-  }
-  fclose(reference_file);
-  fclose(pcm_file);
-}
-}