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javaFlacEncoder is a pure java implementation of a FLAC encoder library. It is designed to allow third-party java applications to enable flac encoding without resorting to use of JNI or scripted file conversions. Additionally, a basic console wav->flac encoding tool is included as part of this package. Original project can be found here: http://javaflacencoder.sourceforge.net/

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/*
 * Copyright (C) 2010  Preston Lacey http://javaflacencoder.sourceforge.net/
 * All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

package net.sourceforge.javaflacencoder;

/**
 * Implements the Subframe abstract class, providing encoding support for the
 * FLAC Constant Subframe.
 *
 * @author Preston Lacey
 */
public class Subframe_Constant extends Subframe {
  /** For debugging: Higher values equals greater output, generally by
   * increments of 10. */
  public static int DEBUG_LEV = 0;
  /** Subframe type supported by this implementation. */
  public static final EncodingConfiguration.SubframeType type =
      EncodingConfiguration.SubframeType.VERBATIM;
  int sampleSize = 0;

  /**
   * Constructor. Sets StreamConfiguration to use. If the StreamConfiguration
   * must later be changed, a new Subframe object must be created as well.
   *
   * @param sc StreamConfiguration to use for encoding.
   */
  public Subframe_Constant(StreamConfiguration sc) {
    super(sc);
    sampleSize = sc.getBitsPerSample();
  }

  /**
   * This method is used to set the encoding configuration.
   * @param ec    encoding configuration to use.
   * @return      true if configuration was changed, false otherwise
   */
  @Override
  public boolean registerConfiguration(EncodingConfiguration ec) {
    super.registerConfiguration(ec);
    return true;
  }

    
  public int encodeSamples(int[] samples, int count, int start, int skip,
      EncodedElement data, int offset, int bitsPerSample ) {
    if(DEBUG_LEV > 0) {
      System.err.println("Subframe_Verbatim::encodeSamples(...)");
    }
    int encodedSamples = count;
    int bits = bitsPerSample+offset+8;
    int bytesNeeded = bits/8;
    if(bits%8 != 0)
      bytesNeeded++;
    data.clear(bytesNeeded, offset);
    data.addInt(0,1);
    data.addInt(0,6);
    data.addInt(0,1);

    int value = samples[start];
    int increment = skip+1;
    int end = start+increment*count;
    int lastValid = end-increment;//assume all were the same
    for(int i = start; i < end; i+= increment) {
      if(samples[i] != value) {
        lastValid = i-increment;//if one differed, find where
        break;
      }
    }
    encodedSamples = (lastValid-start)/increment+1;
    data.addInt(value,bitsPerSample);
    lastEncodedSize = bits - offset;
    System.out.flush();
    if(DEBUG_LEV > 0)
      System.err.println("Subframe_Verbatim::encodeSamples(...): End");
    if(DEBUG_LEV > 10) {
      System.err.println("--: bitsUsed : "+bits+"  : Bytes : "+bytesNeeded);
    }
    return encodedSamples;
  }

}