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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.
#include "base/basictypes.h"
#include "media/audio/audio_util.h"
#include "testing/gtest/include/gtest/gtest.h"
// Number of samples in each audio array.
static const size_t kNumberOfSamples = 4;
namespace media {
TEST(AudioUtilTest, AdjustVolume_u8) {
// Test AdjustVolume() on 8 bit samples.
uint8 samples_u8[kNumberOfSamples] = { 4, 0x40, 0x80, 0xff };
uint8 expected_u8[kNumberOfSamples] = { (4 - 128) / 2 + 128,
(0x40 - 128) / 2 + 128,
(0x80 - 128) / 2 + 128,
(0xff - 128) / 2 + 128 };
bool result_u8 = media::AdjustVolume(samples_u8, sizeof(samples_u8),
1, // channels.
sizeof(samples_u8[0]),
0.5f);
EXPECT_TRUE(result_u8);
int expected_test = memcmp(samples_u8, expected_u8, sizeof(expected_u8));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, AdjustVolume_s16) {
// Test AdjustVolume() on 16 bit samples.
int16 samples_s16[kNumberOfSamples] = { -4, 0x40, -32768, 123 };
int16 expected_s16[kNumberOfSamples] = { -1, 0x10, -8192, 30 };
bool result_s16 = media::AdjustVolume(samples_s16, sizeof(samples_s16),
2, // channels.
sizeof(samples_s16[0]),
0.25f);
EXPECT_TRUE(result_s16);
int expected_test = memcmp(samples_s16, expected_s16, sizeof(expected_s16));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, AdjustVolume_s16_zero) {
// Test AdjustVolume() on 16 bit samples.
int16 samples_s16[kNumberOfSamples] = { -4, 0x40, -32768, 123 };
int16 expected_s16[kNumberOfSamples] = { 0, 0, 0, 0 };
bool result_s16 = media::AdjustVolume(samples_s16, sizeof(samples_s16),
2, // channels.
sizeof(samples_s16[0]),
0.0f);
EXPECT_TRUE(result_s16);
int expected_test = memcmp(samples_s16, expected_s16, sizeof(expected_s16));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, AdjustVolume_s16_one) {
// Test AdjustVolume() on 16 bit samples.
int16 samples_s16[kNumberOfSamples] = { -4, 0x40, -32768, 123 };
int16 expected_s16[kNumberOfSamples] = { -4, 0x40, -32768, 123 };
bool result_s16 = media::AdjustVolume(samples_s16, sizeof(samples_s16),
2, // channels.
sizeof(samples_s16[0]),
1.0f);
EXPECT_TRUE(result_s16);
int expected_test = memcmp(samples_s16, expected_s16, sizeof(expected_s16));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, AdjustVolume_s32) {
// Test AdjustVolume() on 32 bit samples.
int32 samples_s32[kNumberOfSamples] = { -4, 0x40, -32768, 123 };
int32 expected_s32[kNumberOfSamples] = { -1, 0x10, -8192, 30 };
bool result_s32 = media::AdjustVolume(samples_s32, sizeof(samples_s32),
4, // channels.
sizeof(samples_s32[0]),
0.25f);
EXPECT_TRUE(result_s32);
int expected_test = memcmp(samples_s32, expected_s32, sizeof(expected_s32));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, MixStreams_u8_QuarterVolume) {
// Test MixStreams() on 8 bit samples.
uint8 dst_u8[kNumberOfSamples] = { 14, 0x44, 0x80, 0xff };
uint8 src_u8[kNumberOfSamples] = { 4, 0x40, 0x80, 0xff };
uint8 expected_u8[kNumberOfSamples] = { 0, /* saturation */
(0x44 - 128) + (0x40 - 128) / 4 + 128,
(0x80 - 128) + (0x80 - 128) / 4 + 128,
0xff /* saturation */ };
media::MixStreams(dst_u8, src_u8, sizeof(dst_u8), sizeof(src_u8[0]), 0.25f);
int expected_test = memcmp(dst_u8, expected_u8, sizeof(expected_u8));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, MixStreams_u8_FullVolume) {
// Test MixStreams() on 8 bit samples.
uint8 dst_u8[kNumberOfSamples] = { 44, 0x44, 0x80, 0xff };
uint8 src_u8[kNumberOfSamples] = { 4, 0x40, 0x80, 0xff };
uint8 expected_u8[kNumberOfSamples] = { 0, /* saturation */
(0x44 - 128) + (0x40 - 128) + 128,
(0x80 - 128) + (0x80 - 128) + 128,
0xff /* saturation */ };
media::MixStreams(dst_u8, src_u8, sizeof(dst_u8), sizeof(src_u8[0]), 1.0f);
int expected_test = memcmp(dst_u8, expected_u8, sizeof(expected_u8));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, MixStreams_s16_QuarterVolume) {
// Test MixStreams() on 16 bit samples.
int16 dst_s16[kNumberOfSamples] = { -4, 0x40, -32760, 32760 };
int16 src_s16[kNumberOfSamples] = { -4, 0x40, -123, 123 };
int16 expected_s16[kNumberOfSamples] = { -5, 0x50, -32768, 32767 };
media::MixStreams(dst_s16,
src_s16,
sizeof(dst_s16),
sizeof(src_s16[0]),
0.25f);
int expected_test = memcmp(dst_s16, expected_s16, sizeof(expected_s16));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, MixStreams_s16_FullVolume) {
// Test MixStreams() on 16 bit samples.
int16 dst_s16[kNumberOfSamples] = { -4, 0x40, -32760, 32760 };
int16 src_s16[kNumberOfSamples] = { -4, 0x40, -123, 123 };
int16 expected_s16[kNumberOfSamples] = { -8, 0x80, -32768, 32767 };
media::MixStreams(dst_s16,
src_s16,
sizeof(dst_s16),
sizeof(src_s16[0]),
1.0f);
int expected_test = memcmp(dst_s16, expected_s16, sizeof(expected_s16));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, MixStreams_s32_QuarterVolume) {
// Test MixStreams() on 32 bit samples.
int32 dst_s32[kNumberOfSamples] = { -4, 0x40, -32768, 2147483640 };
int32 src_s32[kNumberOfSamples] = { -4, 0x40, -32768, 123 };
int32 expected_s32[kNumberOfSamples] = { -5, 0x50, -40960, 2147483647 };
media::MixStreams(dst_s32,
src_s32,
sizeof(dst_s32),
sizeof(src_s32[0]),
0.25f);
int expected_test = memcmp(dst_s32, expected_s32, sizeof(expected_s32));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, MixStreams_s32_FullVolume) {
// Test MixStreams() on 32 bit samples.
int32 dst_s32[kNumberOfSamples] = { -4, 0x40, -32768, 2147483640 };
int32 src_s32[kNumberOfSamples] = { -4, 0x40, -32768, 123 };
int32 expected_s32[kNumberOfSamples] = { -8, 0x80, -65536, 2147483647 };
media::MixStreams(dst_s32,
src_s32,
sizeof(dst_s32),
sizeof(src_s32[0]),
1.0);
int expected_test = memcmp(dst_s32, expected_s32, sizeof(expected_s32));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, FoldChannels_u8) {
// Test FoldChannels() on 8 bit samples.
uint8 samples_u8[6] = { 100, 150, 130, 70, 130, 170 };
uint8 expected_u8[2] = { static_cast<uint8>((130 - 128) * 0.707 +
(100 - 128) + 128),
static_cast<uint8>((130 - 128) * 0.707 +
(150 - 128) + 128) };
bool result_u8 = media::FoldChannels(samples_u8, sizeof(samples_u8),
6, // channels.
sizeof(samples_u8[0]),
1.0f);
EXPECT_TRUE(result_u8);
int expected_test = memcmp(samples_u8, expected_u8, sizeof(expected_u8));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, FoldChannels_s16) {
// Test FoldChannels() on 16 bit samples.
int16 samples_s16[6] = { 1, 3, 12, 7, 13, 17 };
int16 expected_s16[2] = { static_cast<int16>(12 * .707 + 1),
static_cast<int16>(12 * .707 + 3) };
bool result_s16 = media::FoldChannels(samples_s16, sizeof(samples_s16),
6, // channels.
sizeof(samples_s16[0]),
1.00f);
EXPECT_TRUE(result_s16);
int expected_test = memcmp(samples_s16, expected_s16, sizeof(expected_s16));
EXPECT_EQ(0, expected_test);
}
TEST(AudioUtilTest, FoldChannels_s32) {
// Test FoldChannels() on 32 bit samples.
int32 samples_s32[6] = { 1, 3, 12, 7, 13, 17 };
int32 expected_s32[2] = { static_cast<int16>(12 * .707 + 1),
static_cast<int16>(12 * .707 + 3) };
bool result_s32 = media::FoldChannels(samples_s32, sizeof(samples_s32),
6, // channels.
sizeof(samples_s32[0]),
1.00f);
EXPECT_TRUE(result_s32);
int expected_test = memcmp(samples_s32, expected_s32, sizeof(expected_s32));
EXPECT_EQ(0, expected_test);
}
// Fold 7.1
TEST(AudioUtilTest, FoldChannels71_s16) {
// Test FoldChannels() on 16 bit samples.
int16 samples_s16[8] = { 1, 3, 12, 7, 13, 17, 30, 40 };
int16 expected_s16[2] = { static_cast<int16>(12 * .707 + 1),
static_cast<int16>(12 * .707 + 3) };
bool result_s16 = media::FoldChannels(samples_s16, sizeof(samples_s16),
8, // channels.
sizeof(samples_s16[0]),
1.00f);
EXPECT_TRUE(result_s16);
int expected_test = memcmp(samples_s16, expected_s16, sizeof(expected_s16));
EXPECT_EQ(0, expected_test);
}
} // namespace media
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