Allow more than 2 input channels in AudioProcessing.

webrtc/modules/audio_processing/audio_buffer_unittest.cc

Index: webrtc/modules/audio_processing/audio_buffer_unittest.cc
diff --git a/webrtc/modules/audio_processing/audio_buffer_unittest.cc b/webrtc/modules/audio_processing/audio_buffer_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8e4517f2c4b096f5e7fe2b9a7a7b1cd14824421a
--- /dev/null
+++ b/webrtc/modules/audio_processing/audio_buffer_unittest.cc
@@ -0,0 +1,144 @@
+/*
+ *  Copyright (c) 2015 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 "webrtc/modules/audio_processing/audio_buffer.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+namespace webrtc {
+namespace {
+
+using ::testing::ElementsAreArray;
+
+TEST(AudioBufferHelpersTest, DownmixInterleavedToMonoImpl) {
+  {
+    const int kNumMultichannelFrames = 4;
+    const int kNumChannels = 1;
+    const float interleaved[kNumChannels * kNumMultichannelFrames] = {
+        1.f, 2.f, -1.f, -3.f};
+    float deinterleaved[kNumMultichannelFrames];
+
+    DownmixInterleavedToMonoImpl<float, float>(
+        interleaved, deinterleaved, kNumMultichannelFrames, kNumChannels);
+
+    EXPECT_THAT(deinterleaved, ElementsAreArray(interleaved));
+  }
+  {
+    const int kNumMultichannelFrames = 2;
+    const int kNumChannels = 2;
+    const float interleaved[kNumChannels * kNumMultichannelFrames] = {
+        1.f, 2.f, -1.f, -3.f};
+    float deinterleaved[kNumMultichannelFrames];
+
+    DownmixInterleavedToMonoImpl<float, float>(
+        interleaved, deinterleaved, kNumMultichannelFrames, kNumChannels);
+    const float expected[kNumMultichannelFrames] = {1.5f, -2.f};
+
+    EXPECT_THAT(deinterleaved, ElementsAreArray(expected));
+  }
+  {
+    const int kNumMultichannelFrames = 2;
+    const int kNumChannels = 3;
+    const float interleaved[kNumChannels * kNumMultichannelFrames] = {
+        1.f, 2.f, 3.f, -1.f, -3.f, 7.f};
+    float deinterleaved[kNumMultichannelFrames];
+
+    DownmixInterleavedToMonoImpl<float, float>(
+        interleaved, deinterleaved, kNumMultichannelFrames, kNumChannels);
+    const float expected[kNumMultichannelFrames] = {2.f, 1.f};
+
+    EXPECT_THAT(deinterleaved, ElementsAreArray(expected));
+  }
+  {
+    const int kNumMultichannelFrames = 2;
+    const int kNumChannels = 2;
+    const int16_t interleaved[kNumChannels * kNumMultichannelFrames] = {
+        10, 20, -10, -30};
+    int16_t deinterleaved[kNumMultichannelFrames];
+
+    DownmixInterleavedToMonoImpl<int16_t, int32_t>(
+        interleaved, deinterleaved, kNumMultichannelFrames, kNumChannels);
+    const int16_t expected[kNumMultichannelFrames] = {15, -20};
+
+    EXPECT_THAT(deinterleaved, ElementsAreArray(expected));
+  }
+  {
+    const int kNumMultichannelFrames = 3;
+    const int kNumChannels = 3;
+    const int16_t interleaved[kNumChannels * kNumMultichannelFrames] = {
+        30000, 30000, 24001, -5, -10, -20, -30000, -30999, -30000};
+    int16_t deinterleaved[kNumMultichannelFrames];
+
+    DownmixInterleavedToMonoImpl<int16_t, int32_t>(
+        interleaved, deinterleaved, kNumMultichannelFrames, kNumChannels);
+    const int16_t expected[kNumMultichannelFrames] = {28000, -11, -30333};
+
+    EXPECT_THAT(deinterleaved, ElementsAreArray(expected));
+  }
+}
+
+TEST(AudioBufferHelpersTest, DownmixToMonoTest) {
+  {
+    const int kNumMultichannelFrames = 4;
+    const int kNumChannels = 1;
+    const float input_data[kNumChannels][kNumMultichannelFrames] = {
+        {1.f, 2.f, -1.f, -3.f}};
+    const float* input[kNumChannels];
+    for (int i = 0; i < kNumChannels; ++i) {
+      input[i] = input_data[i];
+    }
+
+    float downmixed[kNumMultichannelFrames];
+
+    DownmixToMono<float, float>(kNumMultichannelFrames, downmixed, input,
+                                kNumChannels);
+
+    EXPECT_THAT(downmixed, ElementsAreArray(input_data[0]));
+  }
+  {
+    const int kNumMultichannelFrames = 3;
+    const int kNumChannels = 2;
+    const float input_data[kNumChannels][kNumMultichannelFrames] = {
+        {1.f, 2.f, -1.f}, {3.f, 0.f, 1.f}};
+    const float* input[kNumChannels];
+    for (int i = 0; i < kNumChannels; ++i) {
+      input[i] = input_data[i];
+    }
+
+    float downmixed[kNumMultichannelFrames];
+    const float expected[kNumMultichannelFrames] = {2.f, 1.f, 0.f};
+
+    DownmixToMono<float, float>(kNumMultichannelFrames, downmixed, input,
+                                kNumChannels);
+
+    EXPECT_THAT(downmixed, ElementsAreArray(expected));
+  }
+  {
+    const int kNumMultichannelFrames = 3;
+    const int kNumChannels = 3;
+    const int16_t input_data[kNumChannels][kNumMultichannelFrames] = {
+        {30000, -5, -30000}, {30000, -10, -30999}, {24001, -20, -30000}};
+    const int16_t* input[kNumChannels];
+    for (int i = 0; i < kNumChannels; ++i) {
+      input[i] = input_data[i];
+    }
+
+    int16_t downmixed[kNumMultichannelFrames];
+    const int16_t expected[kNumMultichannelFrames] = {28000, -11, -30333};
+
+    DownmixToMono<int16_t, int32_t>(kNumMultichannelFrames, downmixed, input,
+                                    kNumChannels);
+
+    EXPECT_THAT(downmixed, ElementsAreArray(expected));
+  }
+}
+
+}  // namespace
+}  // namespace webrtc