/**
* Encodes next value. If value is inside [-arithmeticCodeThreshold, arithmeticCodeThreshold]
* range, then arithmetic encoding is used, otherwise 255 will be encoded by arithmetic encoding
* and then actual value will be encoded by monotone encoding. For example, for value 300, firstly
* - 255 will be encoded by arithmetic encoding and then 300 by monotone encoding.
*/
public void encode(int value, BitOutput arithOut, BitOutput monoOut) throws IOException {
if (value >= -arithmeticCodeThreshold
&& value <= arithmeticCodeThreshold) { // encode value by arithmetic coder
arithmeticEncoder.encode(value + arithmeticCodeThreshold, arithOut);
} else {
// escape to switch fusion decoder to monotone decoder
arithmeticEncoder.encode(FusionCoderConstants.ESCAPE_TO_SWITCH_TO_MONOTONE_CODE, arithOut);
monotoneEncoder.encode(value, monoOut);
}
}
/**
* Close this output stream.
*
* @throws IOException If there is an exception in the underlying encoder.
*/
public void close(BitOutput out) throws IOException {
// must code EOF to allow decoding to halt
arithmeticEncoder.encode(ArithCodeModel.EOF, out);
// to allow arithmetic encoder to output buffered bits
arithmeticEncoder.close(out);
}