package net.sf.fmj.media.codec.audio.ulaw;
import java.util.logging.Logger;
import javax.media.Format;
import javax.media.format.AudioFormat;
import net.sf.fmj.media.AbstractPacketizer;
import net.sf.fmj.utility.LoggerSingleton;
/**
* ULAW/RTP packetizer codec.
* @author Ken Larson
*
*/
public class Packetizer extends AbstractPacketizer
{
private static final Logger logger = LoggerSingleton.logger;
@Override
public String getName()
{
return "ULAW Packetizer";
}
public Packetizer()
{
super();
this.inputFormats = new Format[] {new AudioFormat(AudioFormat.ULAW, -1.0, 8, 1, -1, -1, 8, -1.0, Format.byteArray)};
}
// TODO: move to base class?
protected Format[] outputFormats = new Format[] {new AudioFormat(AudioFormat.ULAW_RTP, -1.0, 8, 1, -1, -1, 8, -1.0, Format.byteArray)};
@Override
public Format[] getSupportedOutputFormats(Format input)
{
if (input == null)
return outputFormats;
else
{
if (!(input instanceof AudioFormat))
{
logger.warning(this.getClass().getSimpleName() + ".getSupportedOutputFormats: input format does not match, returning format array of {null} for " + input); // this can cause an NPE in JMF if it ever happens.
return new Format[] {null};
}
final AudioFormat inputCast = (AudioFormat) input;
if (!inputCast.getEncoding().equals(AudioFormat.ULAW) ||
(inputCast.getSampleSizeInBits() != 8 && inputCast.getSampleSizeInBits() != Format.NOT_SPECIFIED) ||
(inputCast.getChannels() != 1 && inputCast.getChannels() != Format.NOT_SPECIFIED) ||
(inputCast.getFrameSizeInBits() != 8 && inputCast.getFrameSizeInBits() != Format.NOT_SPECIFIED)
)
{
logger.warning(this.getClass().getSimpleName() + ".getSupportedOutputFormats: input format does not match, returning format array of {null} for " + input); // this can cause an NPE in JMF if it ever happens.
return new Format[] {null};
}
final AudioFormat result = new AudioFormat(AudioFormat.ULAW_RTP, inputCast.getSampleRate(), 8,
1, inputCast.getEndian(), inputCast.getSigned(), 8,
inputCast.getFrameRate(), inputCast.getDataType());
return new Format[] {result};
}
}
@Override
public void open()
{
// RFC 3551 4.5 Audio Encodings default ms/packet is 20
// TODO: add some sanity checks
int sampleRate = (int)((AudioFormat)getInputFormat()).getSampleRate();
setPacketSize(sampleRate / 50);
}
@Override
public void close()
{
}
@Override
public Format setInputFormat(Format arg0)
{
return super.setInputFormat(arg0);
}
@Override
public Format setOutputFormat(Format arg0)
{
return super.setOutputFormat(arg0);
}
}