1/* 2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11#include "testing/gtest/include/gtest/gtest.h" 12#include "webrtc/common_audio/include/audio_util.h" 13#include "webrtc/typedefs.h" 14 15namespace webrtc { 16 17void ExpectArraysEq(const int16_t* ref, const int16_t* test, int length) { 18 for (int i = 0; i < length; ++i) { 19 EXPECT_EQ(ref[i], test[i]); 20 } 21} 22 23void ExpectArraysEq(const float* ref, const float* test, int length) { 24 for (int i = 0; i < length; ++i) { 25 EXPECT_FLOAT_EQ(ref[i], test[i]); 26 } 27} 28 29TEST(AudioUtilTest, RoundToInt16) { 30 const int kSize = 7; 31 const float kInput[kSize] = { 32 0.f, 0.4f, 0.5f, -0.4f, -0.5f, 32768.f, -32769.f}; 33 const int16_t kReference[kSize] = {0, 0, 1, 0, -1, 32767, -32768}; 34 int16_t output[kSize]; 35 RoundToInt16(kInput, kSize, output); 36 ExpectArraysEq(kReference, output, kSize); 37} 38 39TEST(AudioUtilTest, ScaleAndRoundToInt16) { 40 const int kSize = 9; 41 const float kInput[kSize] = { 42 0.f, 0.4f / 32767.f, 0.6f / 32767.f, -0.4f / 32768.f, -0.6f / 32768.f, 43 1.f, -1.f, 1.1f, -1.1f}; 44 const int16_t kReference[kSize] = { 45 0, 0, 1, 0, -1, 32767, -32768, 32767, -32768}; 46 int16_t output[kSize]; 47 ScaleAndRoundToInt16(kInput, kSize, output); 48 ExpectArraysEq(kReference, output, kSize); 49} 50 51TEST(AudioUtilTest, ScaleToFloat) { 52 const int kSize = 7; 53 const int16_t kInput[kSize] = {0, 1, -1, 16384, -16384, 32767, -32768}; 54 const float kReference[kSize] = { 55 0.f, 1.f / 32767.f, -1.f / 32768.f, 16384.f / 32767.f, -0.5f, 1.f, -1.f}; 56 float output[kSize]; 57 ScaleToFloat(kInput, kSize, output); 58 ExpectArraysEq(kReference, output, kSize); 59} 60 61TEST(AudioUtilTest, InterleavingStereo) { 62 const int16_t kInterleaved[] = {2, 3, 4, 9, 8, 27, 16, 81}; 63 const int kSamplesPerChannel = 4; 64 const int kNumChannels = 2; 65 const int kLength = kSamplesPerChannel * kNumChannels; 66 int16_t left[kSamplesPerChannel], right[kSamplesPerChannel]; 67 int16_t* deinterleaved[] = {left, right}; 68 Deinterleave(kInterleaved, kSamplesPerChannel, kNumChannels, deinterleaved); 69 const int16_t kRefLeft[] = {2, 4, 8, 16}; 70 const int16_t kRefRight[] = {3, 9, 27, 81}; 71 ExpectArraysEq(kRefLeft, left, kSamplesPerChannel); 72 ExpectArraysEq(kRefRight, right, kSamplesPerChannel); 73 74 int16_t interleaved[kLength]; 75 Interleave(deinterleaved, kSamplesPerChannel, kNumChannels, interleaved); 76 ExpectArraysEq(kInterleaved, interleaved, kLength); 77} 78 79TEST(AudioUtilTest, InterleavingMonoIsIdentical) { 80 const int16_t kInterleaved[] = {1, 2, 3, 4, 5}; 81 const int kSamplesPerChannel = 5; 82 const int kNumChannels = 1; 83 int16_t mono[kSamplesPerChannel]; 84 int16_t* deinterleaved[] = {mono}; 85 Deinterleave(kInterleaved, kSamplesPerChannel, kNumChannels, deinterleaved); 86 ExpectArraysEq(kInterleaved, mono, kSamplesPerChannel); 87 88 int16_t interleaved[kSamplesPerChannel]; 89 Interleave(deinterleaved, kSamplesPerChannel, kNumChannels, interleaved); 90 ExpectArraysEq(mono, interleaved, kSamplesPerChannel); 91} 92 93} // namespace webrtc 94