Low-bandwidth audio testing

webrtc/test/fake_audio_device_unittest.cc

Index: webrtc/test/fake_audio_device_unittest.cc
diff --git a/webrtc/test/fake_audio_device_unittest.cc b/webrtc/test/fake_audio_device_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e88ab7f12f8deea520c14934e9d34cfc11655c18
--- /dev/null
+++ b/webrtc/test/fake_audio_device_unittest.cc
@@ -0,0 +1,127 @@
+/*
+ *  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 <algorithm>
+#include <array>
+
+#include "webrtc/common_audio/wav_file.h"
+#include "webrtc/common_audio/wav_header.h"
+#include "webrtc/test/fake_audio_device.h"
+#include "webrtc/test/gtest.h"
+#include "webrtc/test/testsupport/fileutils.h"
+
+namespace webrtc {
+namespace test {
+
+namespace {
+void RunTest(const std::vector<int16_t>& input_samples,
+             const std::vector<int16_t>& expected_samples,
+             size_t samples_per_frame) {
+  const std::string output_filename = test::OutputPath() + "boundedwavtest.wav";
+
+  static const size_t kSamplesPerFrame = 8;
+  static const int kSampleRate = kSamplesPerFrame * 100;
+  EXPECT_EQ(FakeAudioDevice::SamplesPerFrame(kSampleRate), kSamplesPerFrame);
+
+  {
+    std::unique_ptr<FakeAudioDevice::Renderer> writer =
+        FakeAudioDevice::CreateBoundedWavFileWriter(output_filename, 800);
+
+    for (size_t i = 0; i < input_samples.size(); i += kSamplesPerFrame) {
+      EXPECT_TRUE(writer->Render(rtc::ArrayView<const int16_t>(
+          &input_samples[i],
+          std::min(kSamplesPerFrame, input_samples.size() - i))));
+    }
+  }
+
+  {
+    WavReader reader(output_filename);
+    std::vector<int16_t> read_samples(expected_samples.size());
+    EXPECT_EQ(expected_samples.size(),
+              reader.ReadSamples(read_samples.size(), read_samples.data()));
+    EXPECT_EQ(0u, reader.ReadSamples(read_samples.size(), read_samples.data()));
+
+    EXPECT_EQ(expected_samples, read_samples);
+  }
+
+  remove(output_filename.c_str());
+}
+}  // namespace
+
+TEST(BoundedWavFileWriterTest, NoSilence) {
+  static const std::vector<int16_t> kInputSamples = {
+      75, 1234, 243, -1231, -22222, 0, 3, 88,
+      1222, -1213, -13222, -7, -3525, 5787, -25247, 8
+  };
+  static const std::vector<int16_t> kExpectedSamples = kInputSamples;
+  RunTest(kInputSamples, kExpectedSamples, 8);
+}
+
+TEST(BoundedWavFileWriterTest, SomeStartSilence) {
+  static const std::vector<int16_t> kInputSamples = {
+      0, 0, 0, 0, 3, 0, 0, 0,
+      0, 3, -13222, -7, -3525, 5787, -25247, 8
+  };
+  static const std::vector<int16_t> kExpectedSamples(kInputSamples.begin() + 10,
+                                                     kInputSamples.end());
+  RunTest(kInputSamples, kExpectedSamples, 8);
+}
+
+TEST(BoundedWavFileWriterTest, NegativeStartSilence) {
+  static const std::vector<int16_t> kInputSamples = {
+      0, -4, -6, 0, 3, 0, 0, 0,
+      0, 3, -13222, -7, -3525, 5787, -25247, 8
+  };
+  static const std::vector<int16_t> kExpectedSamples(kInputSamples.begin() + 2,
+                                                     kInputSamples.end());
+  RunTest(kInputSamples, kExpectedSamples, 8);
+}
+
+TEST(BoundedWavFileWriterTest, SomeEndSilence) {
+  static const std::vector<int16_t> kInputSamples = {
+      75, 1234, 243, -1231, -22222, 0, 1, 0,
+      0, 0, 0, 0, 0, 0, 0, 0
+  };
+  static const std::vector<int16_t> kExpectedSamples(kInputSamples.begin(),
+                                                     kInputSamples.end() - 9);
+  RunTest(kInputSamples, kExpectedSamples, 8);
+}
+
+TEST(BoundedWavFileWriterTest, DoubleEndSilence) {
+  static const std::vector<int16_t> kInputSamples = {
+      75, 1234, 243, -1231, -22222, 0, 0, 0,
+      0, -1213, -13222, -7, -3525, 5787, 0, 0
+  };
+  static const std::vector<int16_t> kExpectedSamples(kInputSamples.begin(),
+                                                     kInputSamples.end() - 2);
+  RunTest(kInputSamples, kExpectedSamples, 8);
+}
+
+TEST(BoundedWavFileWriterTest, DoubleSilence) {
+  static const std::vector<int16_t> kInputSamples = {
+      0, -1213, -13222, -7, -3525, 5787, 0, 0
+  };
+  static const std::vector<int16_t> kExpectedSamples(kInputSamples.begin() + 1,
+                                                     kInputSamples.end() - 2);
+  RunTest(kInputSamples, kExpectedSamples, 8);
+}
+
+TEST(BoundedWavFileWriterTest, EndSilenceCutoff) {
+  static const std::vector<int16_t> kInputSamples = {
+      75, 1234, 243, -1231, -22222, 0, 1, 0,
+      0, 0, 0
+  };
+  static const std::vector<int16_t> kExpectedSamples(kInputSamples.begin(),
+                                                     kInputSamples.end() - 4);
+  RunTest(kInputSamples, kExpectedSamples, 8);
+}
+
+}  // namespace test
+}  // namespace webrtc