content: /*
   * Copyright (C) 2013 Adrian Ulrich <adrian@blinkenlights.ch>
   *
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program. If not, see <http://www.gnu.org/licenses/>.
   */
  
  package net.nullsum.audinaut.util.tags;
  
  import androidx.collection.LruCache;
  
  import java.util.HashMap;
  import java.util.Vector;
  
  public final class BastpUtil {
      private static final RGLruCache rgCache = new RGLruCache();
  
      /**
       * Returns the ReplayGain values of 'path' as <track,album>
       */
      public static float[] getReplayGainValues(String path) {
          float[] cached = rgCache.get(path);
  
          if (cached == null) {
              cached = getReplayGainValuesFromFile(path);
              rgCache.put(path, cached);
          }
          return cached;
      }
  
  
      /**
       * Parse given file and return track,album replay gain values
       */
      private static float[] getReplayGainValuesFromFile(String path) {
          String[] keys = {"REPLAYGAIN_TRACK_GAIN", "REPLAYGAIN_ALBUM_GAIN"};
          float[] adjust = {0f, 0f};
          HashMap tags = (new Bastp()).getTags(path);
  
          for (int i = 0; i < keys.length; i++) {
              String curKey = keys[i];
              if (tags.containsKey(curKey)) {
                  String rg_raw = (String) ((Vector) tags.get(curKey)).get(0);
                  float rg_float = 0f;
                  try {
                      String nums = rg_raw.replaceAll("[^0-9.-]", "");
                      rg_float = Float.parseFloat(nums);
                  } catch (Exception ignored) {
                  }
                  adjust[i] = rg_float;
              }
          }
          return adjust;
      }
  
      /**
       * LRU cache for ReplayGain values
       */
      private static class RGLruCache extends LruCache<String, float[]> {
          public RGLruCache() {
              super(16);
          }
      }
  
  }
  
  