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Diffstat (limited to 'dom/media/gtest/TestAudioMixer.cpp')
| -rw-r--r-- | dom/media/gtest/TestAudioMixer.cpp | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/dom/media/gtest/TestAudioMixer.cpp b/dom/media/gtest/TestAudioMixer.cpp new file mode 100644 index 0000000000..017ac960eb --- /dev/null +++ b/dom/media/gtest/TestAudioMixer.cpp @@ -0,0 +1,174 @@ +/* -*- 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(WrapNotNull(&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(WrapNotNull(&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(WrapNotNull(&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(WrapNotNull(&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 |