Android Open Source - FPlayAndroid Equalizer

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The source code is released under:
Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the followin...
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Java Source Code

//
// FPlayAndroid is distributed under the FreeBSD License
////from  w  ww  .  j  a  va  2  s. c  o  m
// Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.
//
// https://github.com/carlosrafaelgn/FPlayAndroid
//
package br.com.carlosrafaelgn.fplay.playback;

import java.util.Arrays;

import br.com.carlosrafaelgn.fplay.util.SerializableMap;

public final class Equalizer {
  private static int sessionId = Integer.MIN_VALUE, minBandLevel, maxBandLevel, preset;
  private static boolean enabled;
  private static int[] bandLevels, bandFrequencies;
  private static android.media.audiofx.Equalizer theEqualizer;
  
  public static void deserializePreset(SerializableMap opts) {
    preset = -1;
    int count = opts.getInt(Player.OPT_EQUALIZER_LEVELCOUNT);
    if (count > 0) {
      if (bandLevels == null) {
        if (count > 512)
          count = 512;
        bandLevels = new int[count];
      }
      for (int i = bandLevels.length - 1; i >= 0; i--)
        bandLevels[i] = opts.getInt(Player.OPT_EQUALIZER_LEVEL0 + i, bandLevels[i]);
    }    
  }
  
  public static void loadConfig(SerializableMap opts) {
    if (opts.hasBits())
      enabled = opts.getBit(Player.OPTBIT_EQUALIZER_ENABLED);
    else
      enabled = opts.getBoolean(Player.OPT_EQUALIZER_ENABLED);
    deserializePreset(opts);
    preset = opts.getInt(Player.OPT_EQUALIZER_PRESET, -1);
  }
  
  public static void serializePreset(SerializableMap opts) {
    opts.put(Player.OPT_EQUALIZER_LEVELCOUNT, (bandLevels != null) ? bandLevels.length : 0);
    if (bandLevels != null) {
      for (int i = bandLevels.length - 1; i >= 0; i--)
        opts.put(Player.OPT_EQUALIZER_LEVEL0 + i, bandLevels[i]);
    }    
  }
  
  public static void saveConfig(SerializableMap opts) {
    opts.putBit(Player.OPTBIT_EQUALIZER_ENABLED, enabled);
    opts.put(Player.OPT_EQUALIZER_PRESET, preset);
    serializePreset(opts);
  }
  
  public static void initialize(int newSessionId) {
    if (newSessionId != Integer.MIN_VALUE)
      sessionId = newSessionId;
    try {
      theEqualizer = new android.media.audiofx.Equalizer(0, sessionId);
    } catch (Throwable ex) {
      return;
    }
    final int bandCount = theEqualizer.getNumberOfBands();
    if (bandLevels == null)
      bandLevels = new int[bandCount];
    else if (bandLevels.length != bandCount)
      bandLevels = Arrays.copyOf(bandLevels, bandCount);
    boolean copyFrequencies = false;
    if (bandFrequencies == null) {
      bandFrequencies = new int[bandCount];
      copyFrequencies = true;
    } else if (bandFrequencies.length != bandCount) {
      bandFrequencies = Arrays.copyOf(bandFrequencies, bandCount);
      copyFrequencies = true;
    }
    if (copyFrequencies) {
      for (int i = bandCount - 1; i >= 0; i--)
        bandFrequencies[i] = theEqualizer.getCenterFreq((short)i) / 1000;
    }
    short[] l = theEqualizer.getBandLevelRange();
    if (l == null || l.length != 2) {
      minBandLevel = -1500;
      maxBandLevel = 1500;
    } else {
      minBandLevel = (int)l[0];
      maxBandLevel = (int)l[1];
    }
  }
  
  public static void release() {
    if (theEqualizer != null) {
      try {
        theEqualizer.release();
      } catch (Throwable ex) {
      }
      theEqualizer = null;
    }
  }
  
  public static boolean isUsingFactoryPreset() {
    return (preset >= 0);
  }
  
  public static int getFactoryPresetCount() {
    return ((theEqualizer == null) ? 0 : (int)theEqualizer.getNumberOfPresets());
  }
  
  public static String getFactoryPresetName(int preset) {
    return ((theEqualizer == null || preset < 0 || preset >= (int)theEqualizer.getNumberOfPresets()) ? null : theEqualizer.getPresetName((short)preset));
  }
  
  public static int getCurrentFactoryPreset() {
    return preset;
  }
  
  public static void setCurrentFactoryPreset(int preset) {
    if (theEqualizer == null)
      return;
    if (preset >= 0 && preset < theEqualizer.getNumberOfPresets()) {
      Equalizer.preset = preset;
      try {
        theEqualizer.usePreset((short)preset);
      } catch (Throwable ex) {
      }
    } else if (preset < 0) {
      Equalizer.preset = -1;
      applyAllBandSettings();
    }
  }
  
  public static boolean isSupported() {
    return ((bandLevels != null) && (bandLevels.length > 0));
  }
  
  public static boolean isEnabled() {
    return enabled;
  }
  
  public static void setEnabled(boolean enabled, boolean actuallyApply) {
    Equalizer.enabled = enabled;
    if (theEqualizer != null && actuallyApply) {
      try {
        if (!enabled) {
          theEqualizer.setEnabled(false);
        } else if (sessionId != Integer.MIN_VALUE) {
          applyAllBandSettings();
          theEqualizer.setEnabled(true);
        }
      } catch (Throwable ex) {
      }
      Equalizer.enabled = theEqualizer.getEnabled();
    }
  }
  
  public static int getBandCount() {
    return ((bandLevels == null) ? 0 : bandLevels.length);
  }
  
  public static int getBandFrequency(int band) {
    return ((bandFrequencies == null || band >= bandFrequencies.length) ? 0 : bandFrequencies[band]);
  }
  
  public static int getMinBandLevel() {
    return minBandLevel;
  }
  
  public static int getMaxBandLevel() {
    return maxBandLevel;
  }
  
  public static int getBandLevel(int band) {
    return ((bandLevels == null || band >= bandLevels.length) ? 0 : bandLevels[band]);
  }
  
  public static void setBandLevel(int band, int level, boolean actuallyApply) {
    if (bandLevels == null || band >= bandLevels.length)
      return;
    if (level > maxBandLevel)
      level = maxBandLevel;
    else if (level < minBandLevel)
      level = minBandLevel;
    bandLevels[band] = level;
    if (actuallyApply) {
      if (preset >= 0) {
        preset = -1;
        applyAllBandSettings();
      } else if (theEqualizer != null) {
        try {
          theEqualizer.setBandLevel((short)band, (short)level);
        } catch (Throwable ex) {
        }
      }
    }
  }
  
  public static void applyAllBandSettings() {
    if (theEqualizer == null)
      return;
    if (preset >= 0 && preset < theEqualizer.getNumberOfPresets()) {
      try {
        theEqualizer.usePreset((short)preset);
      } catch (Throwable ex) {
      }
      return;
    }
    if (bandLevels != null && bandLevels.length > 0) {
      preset = -1;
      try {
        final android.media.audiofx.Equalizer.Settings s = new android.media.audiofx.Equalizer.Settings();
        int i = ((bandLevels.length > (int)theEqualizer.getNumberOfBands()) ? (int)theEqualizer.getNumberOfBands() : bandLevels.length);
        s.bandLevels = new short[i];
        s.curPreset = -1;
        s.numBands = (short)(i);
        for (i = i - 1; i >= 0; i--) {
          int level = bandLevels[i];
          if (level > maxBandLevel) {
            level = maxBandLevel;
            bandLevels[i] = level;
          } else if (level < minBandLevel) {
            level = minBandLevel;
            bandLevels[i] = level;
          }
          s.bandLevels[i] = (short)level;
        }
        theEqualizer.setProperties(s);
      } catch (Throwable ex) {
        for (int i = bandLevels.length - 1; i >= 0; i--) {
          try {
            theEqualizer.setBandLevel((short)i, (short)bandLevels[i]);
          } catch (Throwable ex2) {
          }
        }
      }
    }
  }
}
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