JavaEncoderpublic class JavaEncoder extends AudioPacketizer | Implements an DVI codec which uses Java methods to do the decoding. |
| Fields Summary |
|---|
| private Buffer | pcmBuffer | | private DVIState | dviState | | private long | currentSeq |
| Constructors Summary |
|---|
public JavaEncoder()
////////////////////////////////////////////////////////////////////////////
// Methods
packetSize=240;
supportedInputFormats = new AudioFormat[] {
new AudioFormat(
AudioFormat.LINEAR,
Format.NOT_SPECIFIED,
16,
1,
AudioFormat.LITTLE_ENDIAN,
AudioFormat.SIGNED,
AudioFormat.NOT_SPECIFIED,
Format.NOT_SPECIFIED,
Format.byteArray
)
} ;
defaultOutputFormats = new AudioFormat[] {
new AudioFormat(AudioFormat.DVI_RTP,
AudioFormat.NOT_SPECIFIED,
4, // 4 bits per sample
1,
AudioFormat.NOT_SPECIFIED, //isBigEndian(),
AudioFormat.NOT_SPECIFIED, //isSigned());
AudioFormat.NOT_SPECIFIED,
AudioFormat.NOT_SPECIFIED,
Format.byteArray)
};
PLUGIN_NAME="DVI Encoder";
|
| Methods Summary |
|---|
| public java.lang.Object[] | getControls()
if (controls==null) {
controls=new Control[2];
controls[0]=new PacketSizeAdapter(this,packetSize,true);
controls[1]=new com.sun.media.controls.SilenceSuppressionAdapter(this,false,false);
}
return (Object[])controls;
| | protected javax.media.Format[] | getMatchingOutputFormats(javax.media.Format in)
AudioFormat af =(AudioFormat) in;
supportedOutputFormats = new AudioFormat[] {
new AudioFormat(AudioFormat.DVI_RTP,
af.getSampleRate(),
4, // 4 bits per sample
1,
AudioFormat.NOT_SPECIFIED, //isBigEndian(),
AudioFormat.NOT_SPECIFIED, //isSigned());
AudioFormat.NOT_SPECIFIED,
AudioFormat.NOT_SPECIFIED,
Format.byteArray)
};
return supportedOutputFormats;
| | public void | open()
dviState=new DVIState();
setPacketSize(packetSize);
reset();
| | public int | process(javax.media.Buffer inputBuffer, javax.media.Buffer outputBuffer)decode the buffer
int rc = super.process(inputBuffer,pcmBuffer);
if ( (rc & OUTPUT_BUFFER_NOT_FILLED) != 0)
return rc;
byte[] pcmData =(byte[]) pcmBuffer.getData();
int inpLength = pcmBuffer.getLength();
int outLength = pcmBuffer.getLength()/4;
byte[] outData = validateByteArraySize(outputBuffer,outLength + 4);
// dump the DVI flags from dviState into the first 4 bytes of
// every packet sent out. The 4 bytes comes from the size of
// the dvi payload header in case of RTP
outData[0] = (byte) (dviState.valprev >> 8);
outData[1] = (byte) dviState.valprev;
outData[2] = (byte) dviState.index;
outData[3] = 0;
DVI.encode(pcmData,
0,
outData,
4,
inpLength >> 1,
dviState);
pcmBuffer.setOffset(0);
pcmBuffer.setLength(0);
outputBuffer.setSequenceNumber(currentSeq++);
outputBuffer.setTimeStamp(pcmBuffer.getTimeStamp());
updateOutput(outputBuffer,
outputFormat,
outLength+4,
0);
return rc;
| | public void | reset()
super.reset();
dviState.valprev=0;
dviState.index=0;
pcmBuffer.setOffset(0);
pcmBuffer.setLength(0);
| | public javax.media.Format | setOutputFormat(javax.media.Format out)
// depending on the freq of output format, we must set the packet
// size to be equivalent to 60ms (will be changed to 40 or 20ms)
Format f = super.setOutputFormat(out);
AudioFormat af = (AudioFormat)f;
if (af.getSampleRate() == 8000)
packetSize = 240;
else if (af.getSampleRate() == 11025)
packetSize = 330;
else if (af.getSampleRate() == 22050)
packetSize = 660;
else if (af.getSampleRate() == 44100)
packetSize = 1320;
return f;
| | public synchronized void | setPacketSize(int newPacketSize)
packetSize=newPacketSize*4; // this is pcmBuffer packetSize
sample_count = packetSize/2;
if (history==null) {
history=new byte[packetSize];
return;
}
if (packetSize > history.length ) {
byte[] newHistory=new byte[packetSize];
System.arraycopy(history,0,newHistory,0,historyLength);
history=newHistory;
}
|
|
