DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (1aeaa33a64f9)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165
/* -*- 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