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/*
* Copyright (c) 2013 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 "common_audio/include/audio_util.h"
#include "rtc_base/arraysize.h"
#include "test/gmock.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
using ::testing::ElementsAreArray;
void ExpectArraysEq(const int16_t* ref, const int16_t* test, size_t length) {
for (size_t i = 0; i < length; ++i) {
EXPECT_EQ(ref[i], test[i]);
}
}
void ExpectArraysEq(const float* ref, const float* test, size_t length) {
for (size_t i = 0; i < length; ++i) {
EXPECT_NEAR(ref[i], test[i], 0.01f);
}
}
TEST(AudioUtilTest, S16ToFloat) {
static constexpr int16_t kInput[] = {0, 1, -1, 16384, -16384, 32767, -32768};
static constexpr float kReference[] = {
0.f, 1.f / 32767.f, -1.f / 32768.f, 16384.f / 32767.f, -0.5f, 1.f, -1.f};
static constexpr size_t kSize = arraysize(kInput);
static_assert(arraysize(kReference) == kSize, "");
float output[kSize];
S16ToFloat(kInput, kSize, output);
ExpectArraysEq(kReference, output, kSize);
}
TEST(AudioUtilTest, FloatS16ToS16) {
static constexpr float kInput[] = {0.f, 0.4f, 0.5f, -0.4f,
-0.5f, 32768.f, -32769.f};
static constexpr int16_t kReference[] = {0, 0, 1, 0, -1, 32767, -32768};
static constexpr size_t kSize = arraysize(kInput);
static_assert(arraysize(kReference) == kSize, "");
int16_t output[kSize];
FloatS16ToS16(kInput, kSize, output);
ExpectArraysEq(kReference, output, kSize);
}
TEST(AudioUtilTest, FloatToFloatS16) {
static constexpr float kInput[] = {0.f,
0.4f / 32768.f,
0.6f / 32768.f,
-0.4f / 32768.f,
-0.6f / 32768.f,
1.f,
-1.f,
1.f,
-1.f};
static constexpr float kReference[] = {
0.f, 0.4f, 0.6f, -0.4f, -0.6f, 32768.f, -32768.f, 32768.f, -32768.f};
static constexpr size_t kSize = arraysize(kInput);
static_assert(arraysize(kReference) == kSize, "");
float output[kSize];
FloatToFloatS16(kInput, kSize, output);
ExpectArraysEq(kReference, output, kSize);
}
TEST(AudioUtilTest, FloatS16ToFloat) {
static constexpr float kInput[] = {0.f, 0.4f, 0.6f, -0.4f, -0.6f,
32767.f, -32768.f, 32767.f, -32768.f};
static constexpr float kReference[] = {0.f,
0.4f / 32768.f,
0.6f / 32768.f,
-0.4f / 32768.f,
-0.6f / 32768.f,
1.f,
-1.f,
1.f,
-1.f};
static constexpr size_t kSize = arraysize(kInput);
static_assert(arraysize(kReference) == kSize, "");
float output[kSize];
FloatS16ToFloat(kInput, kSize, output);
ExpectArraysEq(kReference, output, kSize);
}
TEST(AudioUtilTest, DbfsToFloatS16) {
static constexpr float kInput[] = {-90.f, -70.f, -30.f, -20.f, -10.f,
-5.f, -1.f, 0.f, 1.f};
static constexpr float kReference[] = {
1.036215186f, 10.36215115f, 1036.215088f, 3276.800049f, 10362.15137f,
18426.80078f, 29204.51172f, 32768.f, 36766.30078f};
static constexpr size_t kSize = arraysize(kInput);
static_assert(arraysize(kReference) == kSize, "");
float output[kSize];
for (size_t i = 0; i < kSize; ++i) {
output[i] = DbfsToFloatS16(kInput[i]);
}
ExpectArraysEq(kReference, output, kSize);
}
TEST(AudioUtilTest, FloatS16ToDbfs) {
static constexpr float kInput[] = {1.036215143f, 10.36215143f, 1036.215143f,
3276.8f, 10362.151436f, 18426.800543f,
29204.51074f, 32768.0f, 36766.30071f};
static constexpr float kReference[] = {
-90.f, -70.f, -30.f, -20.f, -10.f, -5.f, -1.f, 0.f, 0.9999923706f};
static constexpr size_t kSize = arraysize(kInput);
static_assert(arraysize(kReference) == kSize, "");
float output[kSize];
for (size_t i = 0; i < kSize; ++i) {
output[i] = FloatS16ToDbfs(kInput[i]);
}
ExpectArraysEq(kReference, output, kSize);
}
TEST(AudioUtilTest, InterleavingStereo) {
const int16_t kInterleaved[] = {2, 3, 4, 9, 8, 27, 16, 81};
const size_t kSamplesPerChannel = 4;
const int kNumChannels = 2;
const size_t kLength = kSamplesPerChannel * kNumChannels;
int16_t left[kSamplesPerChannel], right[kSamplesPerChannel];
int16_t* deinterleaved[] = {left, right};
Deinterleave(kInterleaved, kSamplesPerChannel, kNumChannels, deinterleaved);
const int16_t kRefLeft[] = {2, 4, 8, 16};
const int16_t kRefRight[] = {3, 9, 27, 81};
ExpectArraysEq(kRefLeft, left, kSamplesPerChannel);
ExpectArraysEq(kRefRight, right, kSamplesPerChannel);
int16_t interleaved[kLength];
Interleave(deinterleaved, kSamplesPerChannel, kNumChannels, interleaved);
ExpectArraysEq(kInterleaved, interleaved, kLength);
}
TEST(AudioUtilTest, InterleavingMonoIsIdentical) {
const int16_t kInterleaved[] = {1, 2, 3, 4, 5};
const size_t kSamplesPerChannel = 5;
const int kNumChannels = 1;
int16_t mono[kSamplesPerChannel];
int16_t* deinterleaved[] = {mono};
Deinterleave(kInterleaved, kSamplesPerChannel, kNumChannels, deinterleaved);
ExpectArraysEq(kInterleaved, mono, kSamplesPerChannel);
int16_t interleaved[kSamplesPerChannel];
Interleave(deinterleaved, kSamplesPerChannel, kNumChannels, interleaved);
ExpectArraysEq(mono, interleaved, kSamplesPerChannel);
}
TEST(AudioUtilTest, DownmixInterleavedToMono) {
{
const size_t kNumFrames = 4;
const int kNumChannels = 1;
const int16_t interleaved[kNumChannels * kNumFrames] = {1, 2, -1, -3};
int16_t deinterleaved[kNumFrames];
DownmixInterleavedToMono(interleaved, kNumFrames, kNumChannels,
deinterleaved);
EXPECT_THAT(deinterleaved, ElementsAreArray(interleaved));
}
{
const size_t kNumFrames = 2;
const int kNumChannels = 2;
const int16_t interleaved[kNumChannels * kNumFrames] = {10, 20, -10, -30};
int16_t deinterleaved[kNumFrames];
DownmixInterleavedToMono(interleaved, kNumFrames, kNumChannels,
deinterleaved);
const int16_t expected[kNumFrames] = {15, -20};
EXPECT_THAT(deinterleaved, ElementsAreArray(expected));
}
{
const size_t kNumFrames = 3;
const int kNumChannels = 3;
const int16_t interleaved[kNumChannels * kNumFrames] = {
30000, 30000, 24001, -5, -10, -20, -30000, -30999, -30000};
int16_t deinterleaved[kNumFrames];
DownmixInterleavedToMono(interleaved, kNumFrames, kNumChannels,
deinterleaved);
const int16_t expected[kNumFrames] = {28000, -11, -30333};
EXPECT_THAT(deinterleaved, ElementsAreArray(expected));
}
}
TEST(AudioUtilTest, DownmixToMonoTest) {
{
const size_t kNumFrames = 4;
const int kNumChannels = 1;
const float input_data[kNumChannels][kNumFrames] = {{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[kNumFrames];
DownmixToMono<float, float>(input, kNumFrames, kNumChannels, downmixed);
EXPECT_THAT(downmixed, ElementsAreArray(input_data[0]));
}
{
const size_t kNumFrames = 3;
const int kNumChannels = 2;
const float input_data[kNumChannels][kNumFrames] = {{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[kNumFrames];
const float expected[kNumFrames] = {2.f, 1.f, 0.f};
DownmixToMono<float, float>(input, kNumFrames, kNumChannels, downmixed);
EXPECT_THAT(downmixed, ElementsAreArray(expected));
}
{
const size_t kNumFrames = 3;
const int kNumChannels = 3;
const int16_t input_data[kNumChannels][kNumFrames] = {
{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[kNumFrames];
const int16_t expected[kNumFrames] = {28000, -11, -30333};
DownmixToMono<int16_t, int32_t>(input, kNumFrames, kNumChannels, downmixed);
EXPECT_THAT(downmixed, ElementsAreArray(expected));
}
}
} // namespace
} // namespace webrtc
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