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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// MSVC++ requires this to be set before any other includes to get M_SQRT1_2.
#define _USE_MATH_DEFINES
#include "media/base/channel_mixing_matrix.h"
#include <stddef.h>
#include <cmath>
#include "base/macros.h"
#include "base/strings/stringprintf.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace media {
// Test all possible layout conversions can be constructed and mixed.
TEST(ChannelMixingMatrixTest, ConstructAllPossibleLayouts) {
for (ChannelLayout input_layout = CHANNEL_LAYOUT_MONO;
input_layout <= CHANNEL_LAYOUT_MAX;
input_layout = static_cast<ChannelLayout>(input_layout + 1)) {
for (ChannelLayout output_layout = CHANNEL_LAYOUT_MONO;
output_layout <= CHANNEL_LAYOUT_MAX;
output_layout = static_cast<ChannelLayout>(output_layout + 1)) {
// DISCRETE can't be tested here based on the current approach.
// CHANNEL_LAYOUT_STEREO_AND_KEYBOARD_MIC is not mixable.
// Stereo down mix should never be the output layout.
if (input_layout == CHANNEL_LAYOUT_DISCRETE ||
input_layout == CHANNEL_LAYOUT_STEREO_AND_KEYBOARD_MIC ||
output_layout == CHANNEL_LAYOUT_DISCRETE ||
output_layout == CHANNEL_LAYOUT_STEREO_AND_KEYBOARD_MIC ||
output_layout == CHANNEL_LAYOUT_STEREO_DOWNMIX) {
continue;
}
SCOPED_TRACE(base::StringPrintf(
"Input Layout: %d, Output Layout: %d", input_layout, output_layout));
ChannelMixingMatrix matrix_builder(
input_layout,
ChannelLayoutToChannelCount(input_layout),
output_layout,
ChannelLayoutToChannelCount(output_layout));
std::vector<std::vector<float>> matrix;
matrix_builder.CreateTransformationMatrix(&matrix);
}
}
}
// Verify channels are mixed and scaled correctly.
TEST(ChannelMixingMatrixTest, StereoToMono) {
ChannelLayout input_layout = CHANNEL_LAYOUT_STEREO;
ChannelLayout output_layout = CHANNEL_LAYOUT_MONO;
ChannelMixingMatrix matrix_builder(
input_layout,
ChannelLayoutToChannelCount(input_layout),
output_layout,
ChannelLayoutToChannelCount(output_layout));
std::vector<std::vector<float>> matrix;
bool remapping = matrix_builder.CreateTransformationMatrix(&matrix);
// Input: stereo
// LEFT RIGHT
// Output: mono CENTER 0.5 0.5
//
EXPECT_FALSE(remapping);
EXPECT_EQ(1u, matrix.size());
EXPECT_EQ(2u, matrix[0].size());
EXPECT_EQ(0.5f, matrix[0][0]);
EXPECT_EQ(0.5f, matrix[0][1]);
}
TEST(ChannelMixingMatrixTest, MonoToStereo) {
ChannelLayout input_layout = CHANNEL_LAYOUT_MONO;
ChannelLayout output_layout = CHANNEL_LAYOUT_STEREO;
ChannelMixingMatrix matrix_builder(
input_layout,
ChannelLayoutToChannelCount(input_layout),
output_layout,
ChannelLayoutToChannelCount(output_layout));
std::vector<std::vector<float>> matrix;
bool remapping = matrix_builder.CreateTransformationMatrix(&matrix);
// Input: mono
// CENTER
// Output: stereo LEFT 1
// RIGHT 1
//
EXPECT_TRUE(remapping);
EXPECT_EQ(2u, matrix.size());
EXPECT_EQ(1u, matrix[0].size());
EXPECT_EQ(1.0f, matrix[0][0]);
EXPECT_EQ(1u, matrix[1].size());
EXPECT_EQ(1.0f, matrix[1][0]);
}
TEST(ChannelMixingMatrixTest, FiveOneToMono) {
ChannelLayout input_layout = CHANNEL_LAYOUT_5_1;
ChannelLayout output_layout = CHANNEL_LAYOUT_MONO;
ChannelMixingMatrix matrix_builder(
input_layout,
ChannelLayoutToChannelCount(input_layout),
output_layout,
ChannelLayoutToChannelCount(output_layout));
std::vector<std::vector<float>> matrix;
bool remapping = matrix_builder.CreateTransformationMatrix(&matrix);
// Note: 1/sqrt(2) is shown as 0.707.
//
// Input: 5.1
// LEFT RIGHT CENTER LFE SIDE_LEFT SIDE_RIGHT
// Output: mono CENTER 0.707 0.707 1 0.707 0.707 0.707
//
EXPECT_FALSE(remapping);
EXPECT_EQ(1u, matrix.size());
EXPECT_EQ(6u, matrix[0].size());
EXPECT_FLOAT_EQ(static_cast<float>(M_SQRT1_2), matrix[0][0]);
EXPECT_FLOAT_EQ(static_cast<float>(M_SQRT1_2), matrix[0][1]);
// The center channel will be mixed at scale 1.
EXPECT_EQ(1.0f, matrix[0][2]);
EXPECT_FLOAT_EQ(static_cast<float>(M_SQRT1_2), matrix[0][3]);
EXPECT_FLOAT_EQ(static_cast<float>(M_SQRT1_2), matrix[0][4]);
EXPECT_FLOAT_EQ(static_cast<float>(M_SQRT1_2), matrix[0][5]);
}
TEST(ChannelMixingMatrixTest, DiscreteToDiscrete) {
const struct {
int input_channels;
int output_channels;
} test_case[] = {
{2, 2}, {2, 5}, {5, 2},
};
for (size_t n = 0; n < arraysize(test_case); n++) {
int input_channels = test_case[n].input_channels;
int output_channels = test_case[n].output_channels;
ChannelMixingMatrix matrix_builder(CHANNEL_LAYOUT_DISCRETE,
input_channels,
CHANNEL_LAYOUT_DISCRETE,
output_channels);
std::vector<std::vector<float>> matrix;
bool remapping = matrix_builder.CreateTransformationMatrix(&matrix);
EXPECT_TRUE(remapping);
EXPECT_EQ(static_cast<size_t>(output_channels), matrix.size());
for (int i = 0; i < output_channels; i++) {
EXPECT_EQ(static_cast<size_t>(input_channels), matrix[i].size());
for (int j = 0; j < input_channels; j++) {
if (i == j) {
EXPECT_EQ(1.0f, matrix[i][j]);
} else {
EXPECT_EQ(0.0f, matrix[i][j]);
}
}
}
}
}
} // namespace media
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