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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 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;
}
}
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