Support 4 channel mic in Windows Core Audio

webrtc/audio/utility/audio_frame_operations_unittest.cc

Index: webrtc/audio/utility/audio_frame_operations_unittest.cc
diff --git a/webrtc/audio/utility/audio_frame_operations_unittest.cc b/webrtc/audio/utility/audio_frame_operations_unittest.cc
index 36377bd02d8e0db830e7a8353521703908cfc5d1..e3c2d628035621e31aa0ac9107f82c8acdfbfd2c 100644
--- a/webrtc/audio/utility/audio_frame_operations_unittest.cc
+++ b/webrtc/audio/utility/audio_frame_operations_unittest.cc
@@ -27,6 +27,19 @@ class AudioFrameOperationsTest : public ::testing::Test {
   AudioFrame frame_;
 };
 
+void SetFrameData(int16_t ch1,
+                  int16_t ch2,
+                  int16_t ch3,
+                  int16_t ch4,
+                  AudioFrame* frame) {
+  for (size_t i = 0; i < frame->samples_per_channel_ * 4; i += 4) {
+    frame->data_[i] = ch1;
+    frame->data_[i + 1] = ch2;
+    frame->data_[i + 2] = ch3;
+    frame->data_[i + 3] = ch4;
+  }
+}
+
 void SetFrameData(AudioFrame* frame, int16_t left, int16_t right) {
   for (size_t i = 0; i < frame->samples_per_channel_ * 2; i += 2) {
     frame->data_[i] = left;
@@ -145,6 +158,104 @@ TEST_F(AudioFrameOperationsTest, StereoToMonoDoesNotWrapAround) {
   VerifyFramesAreEqual(mono_frame, frame_);
 }
 
+TEST_F(AudioFrameOperationsTest, QuadToMonoFailsWithBadParameters) {
+  frame_.num_channels_ = 1;
+  EXPECT_EQ(-1, AudioFrameOperations::QuadToMono(&frame_));
+  frame_.num_channels_ = 2;
+  EXPECT_EQ(-1, AudioFrameOperations::QuadToMono(&frame_));
+}
+
+TEST_F(AudioFrameOperationsTest, QuadToMonoSucceeds) {
+  frame_.num_channels_ = 4;
+  SetFrameData(4, 2, 6, 8, &frame_);
+  AudioFrame temp_frame;
+  temp_frame.CopyFrom(frame_);
+  EXPECT_EQ(0, AudioFrameOperations::QuadToMono(&frame_));
+
+  AudioFrame mono_frame;
+  mono_frame.samples_per_channel_ = 320;
+  mono_frame.num_channels_ = 1;
+  SetFrameData(&mono_frame, 5);
+  VerifyFramesAreEqual(mono_frame, frame_);
+}
+
+TEST_F(AudioFrameOperationsTest, QuadToMonoBufferSucceeds) {
+  AudioFrame target_frame;
+  frame_.num_channels_ = 4;
+  SetFrameData(4, 2, 6, 8, &frame_);
+
+  target_frame.num_channels_ = 1;
+  target_frame.samples_per_channel_ = frame_.samples_per_channel_;
+
+  AudioFrameOperations::QuadToMono(frame_.data_, frame_.samples_per_channel_,
+                                   target_frame.data_);
+  AudioFrame mono_frame;
+  mono_frame.samples_per_channel_ = 320;
+  mono_frame.num_channels_ = 1;
+  SetFrameData(&mono_frame, 5);
+  VerifyFramesAreEqual(mono_frame, target_frame);
+}
+
+TEST_F(AudioFrameOperationsTest, QuadToMonoDoesNotWrapAround) {
+  frame_.num_channels_ = 4;
+  SetFrameData(-32768, -32768, -32768, -32768, &frame_);
+  EXPECT_EQ(0, AudioFrameOperations::QuadToMono(&frame_));
+
+  AudioFrame mono_frame;
+  mono_frame.samples_per_channel_ = 320;
+  mono_frame.num_channels_ = 1;
+  SetFrameData(&mono_frame, -32768);
+  VerifyFramesAreEqual(mono_frame, frame_);
+}
+
+TEST_F(AudioFrameOperationsTest, QuadToStereoFailsWithBadParameters) {
+  frame_.num_channels_ = 1;
+  EXPECT_EQ(-1, AudioFrameOperations::QuadToStereo(&frame_));
+  frame_.num_channels_ = 2;
+  EXPECT_EQ(-1, AudioFrameOperations::QuadToStereo(&frame_));
+}
+
+TEST_F(AudioFrameOperationsTest, QuadToStereoSucceeds) {
+  frame_.num_channels_ = 4;
+  SetFrameData(4, 2, 6, 8, &frame_);
+  EXPECT_EQ(0, AudioFrameOperations::QuadToStereo(&frame_));
+
+  AudioFrame stereo_frame;
+  stereo_frame.samples_per_channel_ = 320;
+  stereo_frame.num_channels_ = 2;
+  SetFrameData(&stereo_frame, 3, 7);
+  VerifyFramesAreEqual(stereo_frame, frame_);
+}
+
+TEST_F(AudioFrameOperationsTest, QuadToStereoBufferSucceeds) {
+  AudioFrame target_frame;
+  frame_.num_channels_ = 4;
+  SetFrameData(4, 2, 6, 8, &frame_);
+
+  target_frame.num_channels_ = 2;
+  target_frame.samples_per_channel_ = frame_.samples_per_channel_;
+
+  AudioFrameOperations::QuadToStereo(frame_.data_, frame_.samples_per_channel_,
+                                     target_frame.data_);
+  AudioFrame stereo_frame;
+  stereo_frame.samples_per_channel_ = 320;
+  stereo_frame.num_channels_ = 2;
+  SetFrameData(&stereo_frame, 3, 7);
+  VerifyFramesAreEqual(stereo_frame, target_frame);
+}
+
+TEST_F(AudioFrameOperationsTest, QuadToStereoDoesNotWrapAround) {
+  frame_.num_channels_ = 4;
+  SetFrameData(-32768, -32768, -32768, -32768, &frame_);
+  EXPECT_EQ(0, AudioFrameOperations::QuadToStereo(&frame_));
+
+  AudioFrame stereo_frame;
+  stereo_frame.samples_per_channel_ = 320;
+  stereo_frame.num_channels_ = 2;
+  SetFrameData(&stereo_frame, -32768, -32768);
+  VerifyFramesAreEqual(stereo_frame, frame_);
+}
+
 TEST_F(AudioFrameOperationsTest, SwapStereoChannelsSucceedsOnStereo) {
   SetFrameData(&frame_, 0, 1);