text: /*
   *  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 <stdlib.h>
  
  #include "testing/gtest/include/gtest/gtest.h"
  #include "webrtc/common_audio/vad/vad_unittest.h"
  #include "webrtc/typedefs.h"
  
  extern "C" {
  #include "webrtc/common_audio/vad/vad_core.h"
  #include "webrtc/common_audio/vad/vad_filterbank.h"
  }
  
  namespace {
  
  const int kNumValidFrameLengths = 3;
  
  TEST_F(VadTest, vad_filterbank) {
    VadInstT* self = reinterpret_cast<VadInstT*>(malloc(sizeof(VadInstT)));
    static const int16_t kReference[kNumValidFrameLengths] = { 48, 11, 11 };
    static const int16_t kFeatures[kNumValidFrameLengths * kNumChannels] = {
        1213, 759, 587, 462, 434, 272,
        1479, 1385, 1291, 1200, 1103, 1099,
        1732, 1692, 1681, 1629, 1436, 1436
    };
    static const int16_t kOffsetVector[kNumChannels] = {
        368, 368, 272, 176, 176, 176 };
    int16_t features[kNumChannels];
  
    // Construct a speech signal that will trigger the VAD in all modes. It is
    // known that (i * i) will wrap around, but that doesn't matter in this case.
    int16_t speech[kMaxFrameLength];
    for (int16_t i = 0; i < kMaxFrameLength; ++i) {
      speech[i] = (i * i);
    }
  
    int frame_length_index = 0;
    ASSERT_EQ(0, WebRtcVad_InitCore(self));
    for (size_t j = 0; j < kFrameLengthsSize; ++j) {
      if (ValidRatesAndFrameLengths(8000, kFrameLengths[j])) {
        EXPECT_EQ(kReference[frame_length_index],
                  WebRtcVad_CalculateFeatures(self, speech, kFrameLengths[j],
                                              features));
        for (int k = 0; k < kNumChannels; ++k) {
          EXPECT_EQ(kFeatures[k + frame_length_index * kNumChannels],
                    features[k]);
        }
        frame_length_index++;
      }
    }
    EXPECT_EQ(kNumValidFrameLengths, frame_length_index);
  
    // Verify that all zeros in gives kOffsetVector out.
    memset(speech, 0, sizeof(speech));
    ASSERT_EQ(0, WebRtcVad_InitCore(self));
    for (size_t j = 0; j < kFrameLengthsSize; ++j) {
      if (ValidRatesAndFrameLengths(8000, kFrameLengths[j])) {
        EXPECT_EQ(0, WebRtcVad_CalculateFeatures(self, speech, kFrameLengths[j],
                                                 features));
        for (int k = 0; k < kNumChannels; ++k) {
          EXPECT_EQ(kOffsetVector[k], features[k]);
        }
      }
    }
  
    // Verify that all ones in gives kOffsetVector out. Any other constant input
    // will have a small impact in the sub bands.
    for (int16_t i = 0; i < kMaxFrameLength; ++i) {
      speech[i] = 1;
    }
    for (size_t j = 0; j < kFrameLengthsSize; ++j) {
      if (ValidRatesAndFrameLengths(8000, kFrameLengths[j])) {
        ASSERT_EQ(0, WebRtcVad_InitCore(self));
        EXPECT_EQ(0, WebRtcVad_CalculateFeatures(self, speech, kFrameLengths[j],
                                                 features));
        for (int k = 0; k < kNumChannels; ++k) {
          EXPECT_EQ(kOffsetVector[k], features[k]);
        }
      }
    }
  
    free(self);
  }
  }  // namespace
  