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-rw-r--r--dom/media/gtest/TestAudioMixer.cpp165
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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