Package org.jitsi.impl.neomedia.transform.fec

Class FlexFec03BitSet

java.lang.Object

org.jitsi.impl.neomedia.transform.fec.FlexFec03BitSet

public class FlexFec03BitSet
extends Object

A bit-set class which is similar to a standard bitset, but with 2 differences: 1) The size of this set is preserved. Unlike the standard bitset, which will not include leading 0's in its size (which doesn't work well for a bitmask), this one will always report the size it was allocated for 2) When reading (valueOf) and writing (toByteArray) it inverts the order of the bits. This is because in FlexFEC-03, the left-most bit of the mask represents a delta value of '0'.

Constructor Summary

Constructors

Constructor	Description
FlexFec03BitSet(int numBits)	Ctor

Method Summary

Modifier and Type	Method	Description
void	addBit(int bitIndex, boolean bitValue)	Add a bit with the given value in the given position.
void	clear(int bitIndex)	Clear the bit (set to 0) at the given index
boolean	get(int bitIndex)	Get the bit at the given index
void	removeBit(int bitIndex)	Remove a bit from the given position.
void	set(int bitIndex)	Set the bit (set to 1) at the given index
int	sizeBits()	Get the size of this set, in bits
int	sizeBytes()	Get the size of this set, in bytes
byte[]	toByteArray()	Writes this bitset to a byte array, where the rightmost bit is treated as the least significant bit.
String	toString()	Print the bitmask in a manner where the left-most bit is the LSB
static FlexFec03BitSet	valueOf(byte[] bytes)	Parse the value of the given byte buffer into the bitset
static FlexFec03BitSet	valueOf(byte[] bytes, int offset, int length)	Parse the given bytes (at the given offset and length) into a FlexFec03BitSet

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

FlexFec03BitSet

public FlexFec03BitSet(int numBits)

Ctor

Parameters:

numBits - the size, in bits, of this set

Method Detail

set

public void set(int bitIndex)

Set the bit (set to 1) at the given index

get

public boolean get(int bitIndex)

Get the bit at the given index

clear

public void clear(int bitIndex)

Clear the bit (set to 0) at the given index

addBit

public void addBit(int bitIndex,
                   boolean bitValue)

Add a bit with the given value in the given position. Existing bits will be moved to the right. No loss of bits will occur.

Parameters:

bitIndex - the index at which to insert the bit

bitValue - the value to set on the inserted bit

removeBit

public void removeBit(int bitIndex)

Remove a bit from the given position. Existing bits will be moved to the left.

valueOf

public static FlexFec03BitSet valueOf(byte[] bytes)

Parse the value of the given byte buffer into the bitset

valueOf

public static FlexFec03BitSet valueOf(byte[] bytes,
                                      int offset,
                                      int length)

Parse the given bytes (at the given offset and length) into a FlexFec03BitSet

Parameters:

bytes - the byte buffer to parse

offset - the offset at which to start parsing

length - the length (in bytes) of the chunk to parse

Returns:

a FlexFec03BitSet representing the chunk of the given buffer based on the given offset and length

sizeBytes

public int sizeBytes()

Get the size of this set, in bytes

Returns:

the size of this set, in bytes

sizeBits

public int sizeBits()

Get the size of this set, in bits

Returns:

the size of this set, in bits

toByteArray

public byte[] toByteArray()

Writes this bitset to a byte array, where the rightmost bit is treated as the least significant bit.

toString

public String toString()

Print the bitmask in a manner where the left-most bit is the LSB

Overrides:

toString in class Object