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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "AudioMixer.h"
#include "gtest/gtest.h"
using mozilla::AudioDataValue;
using mozilla::AudioSampleFormat;
namespace audio_mixer {
struct MixerConsumer : public mozilla::MixerCallbackReceiver
{
/* In this test, the different audio stream and channels are always created to
* cancel each other. */
void MixerCallback(AudioDataValue* aData, AudioSampleFormat aFormat, uint32_t aChannels, uint32_t aFrames, uint32_t aSampleRate)
{
bool silent = true;
for (uint32_t i = 0; i < aChannels * aFrames; i++) {
if (aData[i] != 0.0) {
if (aFormat == mozilla::AUDIO_FORMAT_S16) {
fprintf(stderr, "Sample at %d is not silent: %d\n", i, (short)aData[i]);
} else {
fprintf(stderr, "Sample at %d is not silent: %f\n", i, (float)aData[i]);
}
silent = false;
}
}
ASSERT_TRUE(silent);
}
};
/* Helper function to give us the maximum and minimum value that don't clip,
* for a given sample format (integer or floating-point). */
template<typename T>
T GetLowValue();
template<typename T>
T GetHighValue();
template<>
float GetLowValue<float>() {
return -1.0;
}
template<>
short GetLowValue<short>() {
return -INT16_MAX;
}
template<>
float GetHighValue<float>() {
return 1.0;
}
template<>
short GetHighValue<short>() {
return INT16_MAX;
}
void FillBuffer(AudioDataValue* aBuffer, uint32_t aLength, AudioDataValue aValue)
{
AudioDataValue* end = aBuffer + aLength;
while (aBuffer != end) {
*aBuffer++ = aValue;
}
}
TEST(AudioMixer, Test)
{
const uint32_t CHANNEL_LENGTH = 256;
const uint32_t AUDIO_RATE = 44100;
MixerConsumer consumer;
AudioDataValue a[CHANNEL_LENGTH * 2];
AudioDataValue b[CHANNEL_LENGTH * 2];
FillBuffer(a, CHANNEL_LENGTH, GetLowValue<AudioDataValue>());
FillBuffer(a + CHANNEL_LENGTH, CHANNEL_LENGTH, GetHighValue<AudioDataValue>());
FillBuffer(b, CHANNEL_LENGTH, GetHighValue<AudioDataValue>());
FillBuffer(b + CHANNEL_LENGTH, CHANNEL_LENGTH, GetLowValue<AudioDataValue>());
{
int iterations = 2;
mozilla::AudioMixer mixer;
mixer.AddCallback(&consumer);
fprintf(stderr, "Test AudioMixer constant buffer length.\n");
while (iterations--) {
mixer.Mix(a, 2, CHANNEL_LENGTH, AUDIO_RATE);
mixer.Mix(b, 2, CHANNEL_LENGTH, AUDIO_RATE);
mixer.FinishMixing();
}
}
{
mozilla::AudioMixer mixer;
mixer.AddCallback(&consumer);
fprintf(stderr, "Test AudioMixer variable buffer length.\n");
FillBuffer(a, CHANNEL_LENGTH / 2, GetLowValue<AudioDataValue>());
FillBuffer(a + CHANNEL_LENGTH / 2, CHANNEL_LENGTH / 2, GetLowValue<AudioDataValue>());
FillBuffer(b, CHANNEL_LENGTH / 2, GetHighValue<AudioDataValue>());
FillBuffer(b + CHANNEL_LENGTH / 2, CHANNEL_LENGTH / 2, GetHighValue<AudioDataValue>());
mixer.Mix(a, 2, CHANNEL_LENGTH / 2, AUDIO_RATE);
mixer.Mix(b, 2, CHANNEL_LENGTH / 2, AUDIO_RATE);
mixer.FinishMixing();
FillBuffer(a, CHANNEL_LENGTH, GetLowValue<AudioDataValue>());
FillBuffer(a + CHANNEL_LENGTH, CHANNEL_LENGTH, GetHighValue<AudioDataValue>());
FillBuffer(b, CHANNEL_LENGTH, GetHighValue<AudioDataValue>());
FillBuffer(b + CHANNEL_LENGTH, CHANNEL_LENGTH, GetLowValue<AudioDataValue>());
mixer.Mix(a, 2, CHANNEL_LENGTH, AUDIO_RATE);
mixer.Mix(b, 2, CHANNEL_LENGTH, AUDIO_RATE);
mixer.FinishMixing();
FillBuffer(a, CHANNEL_LENGTH / 2, GetLowValue<AudioDataValue>());
FillBuffer(a + CHANNEL_LENGTH / 2, CHANNEL_LENGTH / 2, GetLowValue<AudioDataValue>());
FillBuffer(b, CHANNEL_LENGTH / 2, GetHighValue<AudioDataValue>());
FillBuffer(b + CHANNEL_LENGTH / 2, CHANNEL_LENGTH / 2, GetHighValue<AudioDataValue>());
mixer.Mix(a, 2, CHANNEL_LENGTH / 2, AUDIO_RATE);
mixer.Mix(b, 2, CHANNEL_LENGTH / 2, AUDIO_RATE);
mixer.FinishMixing();
}
FillBuffer(a, CHANNEL_LENGTH, GetLowValue<AudioDataValue>());
FillBuffer(b, CHANNEL_LENGTH, GetHighValue<AudioDataValue>());
{
mozilla::AudioMixer mixer;
mixer.AddCallback(&consumer);
fprintf(stderr, "Test AudioMixer variable channel count.\n");
mixer.Mix(a, 1, CHANNEL_LENGTH, AUDIO_RATE);
mixer.Mix(b, 1, CHANNEL_LENGTH, AUDIO_RATE);
mixer.FinishMixing();
mixer.Mix(a, 1, CHANNEL_LENGTH, AUDIO_RATE);
mixer.Mix(b, 1, CHANNEL_LENGTH, AUDIO_RATE);
mixer.FinishMixing();
mixer.Mix(a, 1, CHANNEL_LENGTH, AUDIO_RATE);
mixer.Mix(b, 1, CHANNEL_LENGTH, AUDIO_RATE);
mixer.FinishMixing();
}
{
mozilla::AudioMixer mixer;
mixer.AddCallback(&consumer);
fprintf(stderr, "Test AudioMixer variable stream count.\n");
mixer.Mix(a, 2, CHANNEL_LENGTH, AUDIO_RATE);
mixer.Mix(b, 2, CHANNEL_LENGTH, AUDIO_RATE);
mixer.FinishMixing();
mixer.Mix(a, 2, CHANNEL_LENGTH, AUDIO_RATE);
mixer.Mix(b, 2, CHANNEL_LENGTH, AUDIO_RATE);
mixer.Mix(a, 2, CHANNEL_LENGTH, AUDIO_RATE);
mixer.Mix(b, 2, CHANNEL_LENGTH, AUDIO_RATE);
mixer.FinishMixing();
mixer.Mix(a, 2, CHANNEL_LENGTH, AUDIO_RATE);
mixer.Mix(b, 2, CHANNEL_LENGTH, AUDIO_RATE);
mixer.FinishMixing();
}
}
} // namespace audio_mixer
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