New module for the adaptive level controlling functionality in the audio processing module

webrtc/modules/audio_processing/level_controller/level_controller_unittest.cc

Index: webrtc/modules/audio_processing/level_controller/level_controller_unittest.cc
diff --git a/webrtc/modules/audio_processing/level_controller/level_controller_unittest.cc b/webrtc/modules/audio_processing/level_controller/level_controller_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4058db94b177bbff5e5f7071cd7a9914137e4990
--- /dev/null
+++ b/webrtc/modules/audio_processing/level_controller/level_controller_unittest.cc
@@ -0,0 +1,122 @@
+/*
+ *  Copyright (c) 2016 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 <vector>
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/base/array_view.h"
+#include "webrtc/modules/audio_processing/audio_buffer.h"
+#include "webrtc/modules/audio_processing/include/audio_processing.h"
+#include "webrtc/modules/audio_processing/level_controller/level_controller.h"
+#include "webrtc/modules/audio_processing/test/audio_buffer_tools.h"
+#include "webrtc/modules/audio_processing/test/bitexactness_tools.h"
+
+namespace webrtc {
+namespace {
+
+const int kNumFramesToProcess = 1000;
+
+// Processes a specified amount of frames, verifies the results and reports
+// any errors.
+void RunBitexactnessTest(int sample_rate_hz,
+                         size_t num_channels,
+                         rtc::ArrayView<const float> output_reference) {
+  LevelController level_controller;
+  level_controller.Initialize(sample_rate_hz);
+
+  int samples_per_channel = rtc::CheckedDivExact(sample_rate_hz, 100);
+  const StreamConfig capture_config(sample_rate_hz, num_channels, false);
+  AudioBuffer capture_buffer(
+      capture_config.num_frames(), capture_config.num_channels(),
+      capture_config.num_frames(), capture_config.num_channels(),
+      capture_config.num_frames());
+  test::InputAudioFile capture_file(
+      test::GetApmCaptureTestVectorFileName(sample_rate_hz));
+  std::vector<float> capture_input(samples_per_channel * num_channels);
+  for (size_t frame_no = 0; frame_no < kNumFramesToProcess; ++frame_no) {
+    ReadFloatSamplesFromStereoFile(samples_per_channel, num_channels,
+                                   &capture_file, capture_input);
+
+    test::CopyVectorToAudioBuffer(capture_config, capture_input,
+                                  &capture_buffer);
+
+    level_controller.Process(&capture_buffer);
+  }
+
+  // Extract test results.
+  std::vector<float> capture_output;
+  test::ExtractVectorFromAudioBuffer(capture_config, &capture_buffer,
+                                     &capture_output);
+
+  // Compare the output with the reference. Only the first values of the output
+  // from last frame processed are compared in order not having to specify all
+  // preceding frames as testvectors. As the algorithm being tested has a
+  // memory, testing only the last frame implicitly also tests the preceeding
+  // frames.
+  const float kVectorElementErrorBound = 1.0f / 32768.0f;
+  EXPECT_TRUE(test::VerifyDeinterleavedArray(
+      capture_config.num_frames(), capture_config.num_channels(),
+      output_reference, capture_output, kVectorElementErrorBound));
+}
+
+}  // namespace
+
+TEST(LevelControlBitExactnessTest, Mono8kHz) {
+  const float kOutputReference[] = {-0.023242f, -0.020266f, -0.015097f};
+  RunBitexactnessTest(AudioProcessing::kSampleRate8kHz, 1, kOutputReference);
+}
+
+TEST(LevelControlBitExactnessTest, Mono16kHz) {
+  const float kOutputReference[] = {-0.019461f, -0.018761f, -0.018481f};
+  RunBitexactnessTest(AudioProcessing::kSampleRate16kHz, 1, kOutputReference);
+}
+
+TEST(LevelControlBitExactnessTest, Mono32kHz) {
+  const float kOutputReference[] = {-0.016872f, -0.019118f, -0.018722f};
+  RunBitexactnessTest(AudioProcessing::kSampleRate32kHz, 1, kOutputReference);
+}
+
+// TODO(peah): Investigate why this particular testcase differ between Android
+// and the rest of the platforms.
+TEST(LevelControlBitExactnessTest, Mono48kHz) {
+#if !(defined(WEBRTC_ARCH_ARM64) || defined(WEBRTC_ARCH_ARM) || \
+      defined(WEBRTC_ANDROID))
+  const float kOutputReference[] = {-0.016771f, -0.017831f, -0.020482f};
+#else
+  const float kOutputReference[] = {-0.015949f, -0.016957f, -0.019478f};
+#endif
+  RunBitexactnessTest(AudioProcessing::kSampleRate48kHz, 1, kOutputReference);
+}
+
+TEST(LevelControlBitExactnessTest, Stereo8kHz) {
+  const float kOutputReference[] = {-0.019304f, -0.011600f, -0.016690f,
+                                    -0.071335f, -0.031849f, -0.065694f};
+  RunBitexactnessTest(AudioProcessing::kSampleRate8kHz, 2, kOutputReference);
+}
+
+TEST(LevelControlBitExactnessTest, Stereo16kHz) {
+  const float kOutputReference[] = {-0.016302f, -0.007559f, -0.015668f,
+                                    -0.068346f, -0.031476f, -0.066065f};
+  RunBitexactnessTest(AudioProcessing::kSampleRate16kHz, 2, kOutputReference);
+}
+
+TEST(LevelControlBitExactnessTest, Stereo32kHz) {
+  const float kOutputReference[] = {-0.013944f, -0.008337f, -0.015972f,
+                                    -0.063563f, -0.031233f, -0.066784f};
+  RunBitexactnessTest(AudioProcessing::kSampleRate32kHz, 2, kOutputReference);
+}
+
+TEST(LevelControlBitExactnessTest, Stereo48kHz) {
+  const float kOutputReference[] = {-0.013652f, -0.008125f, -0.014593f,
+                                    -0.062963f, -0.030270f, -0.064727f};
+  RunBitexactnessTest(AudioProcessing::kSampleRate48kHz, 2, kOutputReference);
+}
+
+}  // namespace webrtc