audioproc_f with simulated mic analog gain

webrtc/modules/audio_processing/test/fake_recording_device_unittest.cc

+/*
+ *  Copyright (c) 2017 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 <memory>
+#include <sstream>
+#include <string>
+#include <vector>
+
+#include "webrtc/base/array_view.h"
+#include "webrtc/base/ptr_util.h"
+#include "webrtc/modules/audio_processing/test/fake_rec_device_identity.h"
+#include "webrtc/modules/audio_processing/test/fake_rec_device_linear.h"
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+namespace test {
+namespace {
+
+rtc::Optional<int> kRealDeviceLevelUnknown;
+
+constexpr int kInitialMicLevel = 100;
+
+// TODO(alessiob): Add new fake recording device kinds here as they are added to
+// FakeRecordingDevice::DeviceKind.
+const std::vector<FakeRecordingDevice::DeviceKind> kFakeRecDeviceKinds = {
+    FakeRecordingDevice::DeviceKind::IDENTITY,
+    FakeRecordingDevice::DeviceKind::LINEAR,
+};
+
+const std::vector<std::vector<float>> kTestMultiChannelSamples{
+    std::vector<float>{-10.0, -1.0, -0.1, 0.0, 0.1, 1.0, 10.0}};
+
+// Writes samples into ChannelBuffer<float>.
+void WritesDataIntoChannelBuffer(const std::vector<std::vector<float>>& data,
+                                 ChannelBuffer<float>* buff) {
+  EXPECT_EQ(data.size(), buff->num_channels());
+  EXPECT_EQ(data[0].size(), buff->num_frames());
+  for (size_t c = 0; c < buff->num_channels(); ++c) {
+    for (size_t f = 0; f < buff->num_frames(); ++f) {
+      buff->channels()[c][f] = data[c][f];
+    }
+  }
+}
+
+std::unique_ptr<ChannelBuffer<float>> CreateChannelBufferWithData(
+    const std::vector<std::vector<float>>& data) {
+  auto buff = rtc::MakeUnique<ChannelBuffer<float>>(
+      data[0].size(), data.size());
+  WritesDataIntoChannelBuffer(data, buff.get());
+  return buff;
+}
+
+// Checks that the samples modified using monotonic level values are also
+// monotonic.
+void CheckIfMonotoneSamplesModules(
+    const ChannelBuffer<float>* prev, const ChannelBuffer<float>* curr) {
+  RTC_DCHECK_EQ(prev->num_channels(), curr->num_channels());
+  RTC_DCHECK_EQ(prev->num_frames(), curr->num_frames());
+  bool valid = true;
+  for (size_t i = 0; i < prev->num_channels(); ++i) {
+    for (size_t j = 0; j < prev->num_frames(); ++j) {
+      valid = std::fabs(prev->channels()[i][j]) <= std::fabs(
+          curr->channels()[i][j]);
+      if (!valid) { break; }
+    }
+    if (!valid) { break; }
+  }
+  EXPECT_TRUE(valid);
+}
+
+// Checks that the samples in each pair have the same sign unless the sample in
+// |dst| is zero (because of zero gain).
+void CheckSameSign(
+    const ChannelBuffer<float>* src, const ChannelBuffer<float>* dst) {
+  RTC_DCHECK_EQ(src->num_channels(), dst->num_channels());
+  RTC_DCHECK_EQ(src->num_frames(), dst->num_frames());
+  const auto fsgn = [](float x) { return ((x < 0) ? -1 : (x > 0) ? 1 : 0); };
+  bool valid = true;
+  for (size_t i = 0; i < src->num_channels(); ++i) {
+    for (size_t j = 0; j < src->num_frames(); ++j) {
+      valid = dst->channels()[i][j] == 0.0f ||
+          fsgn(src->channels()[i][j]) == fsgn(dst->channels()[i][j]);
+      if (!valid) { break; }
+    }
+    if (!valid) { break; }
+  }
+  EXPECT_TRUE(valid);
+}
+
+std::string FakeRecordingDeviceKindToString(
+    FakeRecordingDevice::DeviceKind fake_rec_device_kind) {
+  std::ostringstream ss;
+  ss << "fake recording device: " << static_cast<size_t>(fake_rec_device_kind);
+  return ss.str();
+}
+
+std::string AnalogLevelToString(int level) {
+  std::ostringstream ss;
+  ss << "analog level: " << level;
+  return ss.str();
+}
+
+}  // namespace
+
+TEST(FakeRecordingDevice, CheckHelperFunctions) {
+  // Check read.
+  auto buff = CreateChannelBufferWithData(kTestMultiChannelSamples);
+  for (size_t c = 0; c < kTestMultiChannelSamples.size(); ++c) {
+    for (size_t f = 0; f < kTestMultiChannelSamples[0].size(); ++f) {
+      EXPECT_EQ(kTestMultiChannelSamples[c][f], buff->channels()[c][f]);
+    }
+  }
+
+  // Check write.
+  constexpr size_t channel_index = 0;
+  constexpr size_t sample_index = 1;
+  buff->channels()[channel_index][sample_index] = -5.0f;
+  RTC_DCHECK_NE(buff->channels()[channel_index][sample_index],
+                kTestMultiChannelSamples[channel_index][sample_index]);
+
+  // Check reset.
+  WritesDataIntoChannelBuffer(kTestMultiChannelSamples, buff.get());
+  EXPECT_EQ(buff->channels()[channel_index][sample_index],
+            kTestMultiChannelSamples[channel_index][sample_index]);
+}
+
+TEST(FakeRecordingDevice, GainCurveShouldBeMonotone) {
+  // Create input-output buffers.
+  auto buff_prev = CreateChannelBufferWithData(kTestMultiChannelSamples);
+  auto buff_curr = CreateChannelBufferWithData(kTestMultiChannelSamples);
+
+  // Test different mappings.
+  for (auto fake_rec_device_kind : kFakeRecDeviceKinds) {
+    SCOPED_TRACE(FakeRecordingDeviceKindToString(fake_rec_device_kind));
+    auto fake_recording_device = FakeRecordingDevice::GetFakeRecDevice(
+        fake_rec_device_kind, kInitialMicLevel);
+    fake_recording_device->set_undo_mic_level(kRealDeviceLevelUnknown);
+    // TODO(alessiob): The test below is designed for state-less recording
+    // devices. If, for instance, a device has memory, the test might need
+    // to be redesigned (e.g., re-initialize fake recording device).
+
+    // Apply lowest analog level.
+    WritesDataIntoChannelBuffer(kTestMultiChannelSamples, buff_prev.get());
+    fake_recording_device->set_mic_level(0);
+    fake_recording_device->SimulateAnalogGain(buff_prev.get());
+
+    // Increment analog level to check monotonicity.
+    for (int i = 1; i <= 255; ++i) {
+      SCOPED_TRACE(AnalogLevelToString(i));
+      WritesDataIntoChannelBuffer(kTestMultiChannelSamples, buff_curr.get());
+      fake_recording_device->set_mic_level(i);
+      fake_recording_device->SimulateAnalogGain(buff_curr.get());
+      CheckIfMonotoneSamplesModules(buff_prev.get(), buff_curr.get());
+
+      // Update prev.
+      buff_prev.swap(buff_curr);
+    }
+  }
+}
+
+TEST(FakeRecordingDevice, GainCurveShouldNotChangeSign) {
+  // Create view on orignal samples.
+  std::unique_ptr<const ChannelBuffer<float>> buff_orig =
+      CreateChannelBufferWithData(kTestMultiChannelSamples);
+
+  // Create output buffer.
+  auto buff = CreateChannelBufferWithData(kTestMultiChannelSamples);
+
+  // Test different mappings.
+  for (auto fake_rec_device_kind : kFakeRecDeviceKinds) {
+    SCOPED_TRACE(FakeRecordingDeviceKindToString(fake_rec_device_kind));
+    auto fake_recording_device = FakeRecordingDevice::GetFakeRecDevice(
+        fake_rec_device_kind, kInitialMicLevel);
+    fake_recording_device->set_undo_mic_level(kRealDeviceLevelUnknown);
+    // TODO(alessiob): The test below is designed for state-less recording
+    // devices. If, for instance, a device has memory, the test might need
+    // to be redesigned (e.g., re-initialize fake recording device).
+
+    for (int i = 0; i <= 255; ++i) {
+      SCOPED_TRACE(AnalogLevelToString(i));
+      WritesDataIntoChannelBuffer(kTestMultiChannelSamples, buff.get());
+      fake_recording_device->set_mic_level(i);
+      fake_recording_device->SimulateAnalogGain(buff.get());
+      CheckSameSign(buff_orig.get(), buff.get());
+    }
+  }
+}
+
+}  // namespace test
+}  // namespace webrtc