JavaEncoderpublic class JavaEncoder extends AudioCodec
| Fields Summary |
|---|
| private Format | lastFormat | | private int | numberOfInputChannels | | private int | numberOfOutputChannels | | private boolean | downmix | | private int | inputSampleSize | | private int | lsbOffset | | private int | msbOffset | | private int | inputBias | | private int | signMask |
| Constructors Summary |
|---|
public JavaEncoder()
supportedInputFormats = new AudioFormat[] {
new AudioFormat(
AudioFormat.LINEAR,
Format.NOT_SPECIFIED,
16,
1,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED
),
new AudioFormat(
AudioFormat.LINEAR,
Format.NOT_SPECIFIED,
16,
2,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED
),
new AudioFormat(
AudioFormat.LINEAR,
Format.NOT_SPECIFIED,
8,
1,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED
),
new AudioFormat(
AudioFormat.LINEAR,
Format.NOT_SPECIFIED,
8,
2,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED
) }; // support 1/2 channels and 8/16 bit samples
defaultOutputFormats = new AudioFormat[] {
new AudioFormat(
AudioFormat.ULAW,
8000,
8,
1,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED
) };
PLUGIN_NAME="pcm to mu-law converter";
|
| Methods Summary |
|---|
| private int | calculateOutputSize(int inputLength)
if (inputSampleSize == 16) {
inputLength/=2;
}
if (downmix) {
inputLength/=2;
}
return inputLength;
| | public void | close()
| | private void | convert(byte[] input, int inputOffset, int inputLength, byte[] outData, int outputOffset)
int sample, signBit , inputSample;
int i;
for(i=inputOffset+msbOffset;i<(inputLength+inputOffset); ) {
if (8 == inputSampleSize) {
inputSample = input[i++]<<8;
if (downmix) {
inputSample = ( (inputSample&signMask) + ( (input[i++]<<8)&signMask) ) >> 1;
}
}
else {
inputSample = (input[i] << 8) + (0xff & input[i+lsbOffset]);
i+=2;
if (downmix) {
inputSample = ( (inputSample&signMask)+ ( ((input[i] << 8) + (0xff & input[i+lsbOffset]))&signMask ) )>>1;
i+=2;
}
}
sample = (int)( (short)(inputSample+inputBias) );
if (sample>=0) { // Sample=abs(sample)
signBit=0x80; // sign bit
} else {
sample= -sample;
signBit=0x00;
}
sample = (132 + sample) >> 3; //bias
outData[outputOffset++]=(byte)((sample<0x0020) ? (signBit | (7 << 4) | (31 - (sample >> 0) )) :
(sample<0x0040) ? (signBit | (6 << 4) | (31 - (sample >> 1) )) :
(sample<0x0080) ? (signBit | (5 << 4) | (31 - (sample >> 2) )) :
(sample<0x0100) ? (signBit | (4 << 4) | (31 - (sample >> 3) )) :
(sample<0x0200) ? (signBit | (3 << 4) | (31 - (sample >> 4) )) :
(sample<0x0400) ? (signBit | (2 << 4) | (31 - (sample >> 5) )) :
(sample<0x0800) ? (signBit | (1 << 4) | (31 - (sample >> 6) )) :
(sample<0x1000) ? (signBit | (0 << 4) | (31 - (sample >> 7) )) :
(signBit | (0 << 4) | (31 - (0xfff >> 7) )) );
}
| | protected javax.media.Format[] | getMatchingOutputFormats(javax.media.Format in)
AudioFormat inFormat=(AudioFormat)in;
int channels = inFormat.getChannels();
int sampleRate = (int) (inFormat.getSampleRate());
if (channels==2) {
supportedOutputFormats = new AudioFormat[] {
new AudioFormat(
AudioFormat.ULAW,
sampleRate,
8,
2,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED
),
new AudioFormat(
AudioFormat.ULAW,
sampleRate,
8,
1,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED
) };
}
else {
supportedOutputFormats = new AudioFormat[] {
new AudioFormat(
AudioFormat.ULAW,
sampleRate,
8,
1,
Format.NOT_SPECIFIED,
Format.NOT_SPECIFIED
) };
}
return supportedOutputFormats;
| | private void | initConverter(javax.media.format.AudioFormat inFormat)
lastFormat=inFormat;
numberOfInputChannels=inFormat.getChannels();
if (outputFormat != null)
numberOfOutputChannels=outputFormat.getChannels();
inputSampleSize=inFormat.getSampleSizeInBits();
if ( (inFormat.getEndian()==AudioFormat.BIG_ENDIAN) || (8 == inputSampleSize) ) {
lsbOffset = 1;
msbOffset=0;
}
else {
lsbOffset = -1;
msbOffset=1;
}
if (inFormat.getSigned()==AudioFormat.SIGNED) {
inputBias = 0;
signMask=0xffffffff;
}
else {
inputBias = 32768;
signMask=0x0000ffff;
}
if ( (numberOfInputChannels==2) && (numberOfOutputChannels==1) ) {
downmix=true;
}
else {
downmix=false;
}
| | public void | open()
| | public int | process(javax.media.Buffer inputBuffer, javax.media.Buffer outputBuffer)
if (!checkInputBuffer(inputBuffer) ) {
return BUFFER_PROCESSED_FAILED;
}
if (isEOM(inputBuffer) ) {
propagateEOM(outputBuffer);
return BUFFER_PROCESSED_OK;
}
Format newFormat = inputBuffer.getFormat();
if (lastFormat != newFormat) {
initConverter((AudioFormat)newFormat);
}
int inpLength=inputBuffer.getLength();
int outLength = calculateOutputSize(inputBuffer.getLength() );
byte[] inpData = (byte[]) inputBuffer.getData();
byte[] outData = validateByteArraySize(outputBuffer, outLength);
convert(inpData, inputBuffer.getOffset(),inpLength, outData, 0);
updateOutput(outputBuffer, outputFormat, outLength, 0);
return BUFFER_PROCESSED_OK;
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