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/*
* Copyright (C) 2024 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "Test.h"
#include <WebCore/AudioSampleFormat.h>
#include <cstdint>
#include <wtf/Vector.h>
namespace TestWebKitAPI {
using namespace WebCore;
using namespace WTF;
#define AUDIO_SAMPLE_WITH_MORE_TESTS 1
TEST(AudioSampleFormat, U8)
{
auto testVectorUint8 = Vector<uint8_t>::from(0, INT8_MAX / 2, 128, INT8_MAX / 2 + 128, UINT8_MAX);
Vector<float> testVectorFloatFromUint8(testVectorUint8.size(), [&](auto index) {
return convertAudioSample<float>(testVectorUint8[index]);
});
Vector<uint8_t> testVectorUint8FromFloat(testVectorFloatFromUint8.size(), [&](auto index) {
return convertAudioSample<uint8_t>(testVectorFloatFromUint8[index]);
});
for (size_t i = 0; i < testVectorUint8.size(); i++)
EXPECT_EQ(testVectorUint8[i], testVectorUint8FromFloat[i]);
// Test that the min and max of the [-1, 1] range can be reached and that BIAS value gets converted to 0.
EXPECT_EQ(-1.0f, convertAudioSample<float>(static_cast<uint8_t>(0)));
EXPECT_EQ(0.0f, convertAudioSample<float>(static_cast<uint8_t>(128)));
EXPECT_EQ(1.0f, convertAudioSample<float>(static_cast<uint8_t>(255)));
// Test that conversion to float and back is lossless.
for (uint8_t i = 0; i < 255; i++)
EXPECT_EQ(i, convertAudioSample<uint8_t>(convertAudioSample<float>(i)));
}
TEST(AudioSampleFormat, S16)
{
auto testVectorInt16 = Vector<int16_t>::from(INT16_MIN, 0, INT16_MIN / 2, INT16_MAX / 2, INT16_MAX);
Vector<float> testVectorFloatFromInt16(testVectorInt16.size(), [&](auto index) {
return convertAudioSample<float>(testVectorInt16[index]);
});
Vector<int16_t> testVectorInt16FromFloat(testVectorFloatFromInt16.size(), [&](auto index) {
return convertAudioSample<int16_t>(testVectorFloatFromInt16[index]);
});
for (size_t i = 0; i < testVectorInt16.size(); i++)
EXPECT_EQ(testVectorInt16[i], testVectorInt16FromFloat[i]);
// Test that the min and max of the [-1, 1] range can be reached and that silence stays silent.
EXPECT_EQ(-1.0f, convertAudioSample<float>(static_cast<int16_t>(INT16_MIN)));
EXPECT_EQ(0.0f, convertAudioSample<float>(static_cast<int16_t>(0)));
EXPECT_EQ(1.0f, convertAudioSample<float>(static_cast<int16_t>(INT16_MAX)));
}
TEST(AudioSampleFormat, S16toU8)
{
EXPECT_EQ(0, convertAudioSample<uint8_t>(static_cast<int16_t>(INT16_MIN)));
EXPECT_EQ(128, convertAudioSample<uint8_t>(static_cast<int16_t>(0)));
EXPECT_EQ(255, convertAudioSample<uint8_t>(static_cast<int16_t>(INT16_MAX)));
}
TEST(AudioSampleFormat, S16toS32)
{
// Conversion from S16 to S32 and back is lossless.
auto testVectorInt16 = Vector<int16_t>::from(INT16_MIN, 0, INT16_MIN / 2, INT16_MAX / 2, INT16_MAX);
Vector<int32_t> testVectorInt32FromInt16(testVectorInt16.size(), [&](auto index) {
return convertAudioSample<int32_t>(testVectorInt16[index]);
});
Vector<int16_t> testVectorInt16FromInt32(testVectorInt32FromInt16.size(), [&](auto index) {
return convertAudioSample<int16_t>(testVectorInt32FromInt16[index]);
});
for (size_t i = 0; i < testVectorInt16.size(); i++)
EXPECT_EQ(testVectorInt16[i], testVectorInt16FromInt32[i]);
EXPECT_GE(INT32_MAX / 2, convertAudioSample<int32_t>(static_cast<int16_t>(INT16_MAX / 2)));
EXPECT_LE(INT32_MIN / 2, convertAudioSample<int32_t>(static_cast<int16_t>(INT16_MIN / 2)));
#if AUDIO_SAMPLE_WITH_MORE_TESTS
// May be too slow to enable all the time.
for (int32_t i = std::numeric_limits<int16_t>::lowest(); i <= std::numeric_limits<int16_t>::lowest(); i++)
EXPECT_EQ(i, convertAudioSample<int16_t>(convertAudioSample<int32_t, int16_t>(i)));
#endif
}
TEST(AudioSampleFormat, S32)
{
auto testVectorInt32 = Vector<int32_t>::from(INT32_MIN, 0, INT32_MIN / 2, INT32_MAX / 2, INT32_MAX);
Vector<float> testVectorFloatFromInt32(testVectorInt32.size(), [&](auto index) {
return convertAudioSample<float>(testVectorInt32[index]);
});
Vector<int32_t> testVectorInt32FromFloat(testVectorFloatFromInt32.size(), [&](auto index) {
return convertAudioSample<int32_t>(testVectorFloatFromInt32[index]);
});
// S32 provides greater accuracy than a 32 bits float (it only has a 24 bits mantissa). So the conversion back and forth may not be lossless.
// At the most it will be off by one.
for (size_t i = 0; i < testVectorInt32.size(); i++)
EXPECT_LE(std::abs(testVectorInt32[i] - testVectorInt32FromFloat[i]), 1);
// Test that the min and max of the [-1, 1] range can be reached.
EXPECT_EQ(-1.0f, convertAudioSample<float>(static_cast<int32_t>(INT32_MIN)));
EXPECT_EQ(0.0f, convertAudioSample<float>(static_cast<int32_t>(0)));
EXPECT_EQ(1.0f, convertAudioSample<float>(static_cast<int32_t>(INT32_MAX)));
}
TEST(AudioSampleFormat, S32toS16)
{
EXPECT_EQ(INT16_MIN, convertAudioSample<int16_t>(static_cast<int32_t>(INT32_MIN)));
EXPECT_EQ(INT16_MAX, convertAudioSample<int16_t>(static_cast<int32_t>(INT32_MAX)));
EXPECT_GE(INT16_MAX / 2, convertAudioSample<int16_t>(static_cast<int32_t>(INT32_MAX / 2)));
EXPECT_LE(INT16_MIN / 2, convertAudioSample<int16_t>(static_cast<int32_t>(INT32_MIN / 2)));
}
TEST(AudioSampleFormat, F32)
{
auto testVectorFloat = Vector<float>::from(-1.0, -.75, -0.5, -0.3, -0.1, 0.0, 0.1, 0.3, 0.5, 0.75, 1.0);
Vector<int32_t> testVectorInt32FromFloat(testVectorFloat.size(), [&](auto index) {
return convertAudioSample<int32_t>(testVectorFloat[index]);
});
Vector<float> testVectorFloatFromInt32(testVectorInt32FromFloat.size(), [&](auto index) {
return convertAudioSample<float>(testVectorInt32FromFloat[index]);
});
for (size_t i = 0; i < testVectorFloat.size(); i++)
EXPECT_EQ(testVectorFloat[i], testVectorFloatFromInt32[i]);
// Test that clipping is properly done.
EXPECT_EQ(1.0f, convertAudioSample<float>(1.1f));
EXPECT_EQ(-1.0f, convertAudioSample<float>(-1.1f));
EXPECT_EQ(1.0f, convertAudioSample<float>(convertAudioSample<int32_t>(1.1f)));
EXPECT_EQ(-1.0f, convertAudioSample<float>(convertAudioSample<int32_t>(-1.1f)));
}
} // namespace TestWebKitAPI
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