com.google.android.exoplayer.util

Class ParsableBitArray

java.lang.Object

com.google.android.exoplayer.util.ParsableBitArray

public final class ParsableBitArray
extends Object

Wraps a byte array, providing methods that allow it to be read as a bitstream.

Field Summary

Fields

Modifier and Type	Field and Description
byte[]	data

Constructor Summary

Constructors

Constructor and Description
ParsableBitArray() Creates a new instance that initially has no backing data.
ParsableBitArray(byte[] data) Creates a new instance that wraps an existing array.
ParsableBitArray(byte[] data, int limit) Creates a new instance that wraps an existing array.

Method Summary

Modifier and Type	Method and Description
int	bitsLeft() Returns the number of bits yet to be read.
boolean	canReadExpGolombCodedNum() Returns whether it is possible to read an Exp-Golomb-coded integer starting from the current offset.
int	getPosition() Gets the current bit offset.
boolean	readBit() Reads a single bit.
int	readBits(int numBits) Reads up to 32 bits.
int	readSignedExpGolombCodedInt() Reads an signed Exp-Golomb-coded format integer.
int	readUnsignedExpGolombCodedInt() Reads an unsigned Exp-Golomb-coded format integer.
void	reset(byte[] data) Updates the instance to wrap data, and resets the position to zero.
void	reset(byte[] data, int limit) Updates the instance to wrap data, and resets the position to zero.
void	setPosition(int position) Sets the current bit offset.
void	skipBits(int n) Skips bits and moves current reading position forward.

Methods inherited from class java.lang.Object

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

Field Detail

data

public byte[] data

Constructor Detail

ParsableBitArray

public ParsableBitArray()

Creates a new instance that initially has no backing data.

ParsableBitArray

public ParsableBitArray(byte[] data)

Creates a new instance that wraps an existing array.

Parameters:

data - The data to wrap.

ParsableBitArray

public ParsableBitArray(byte[] data,
                        int limit)

Creates a new instance that wraps an existing array.

Parameters:

data - The data to wrap.

limit - The limit in bytes.

Method Detail

reset

public void reset(byte[] data)

Updates the instance to wrap data, and resets the position to zero.

Parameters:

data - The array to wrap.

reset

public void reset(byte[] data,
                  int limit)

Updates the instance to wrap data, and resets the position to zero.

Parameters:

data - The array to wrap.

limit - The limit in bytes.

bitsLeft

public int bitsLeft()

Returns the number of bits yet to be read.

getPosition

public int getPosition()

Gets the current bit offset.

Returns:

The current bit offset.

setPosition

public void setPosition(int position)

Sets the current bit offset.

Parameters:

position - The position to set.

skipBits

public void skipBits(int n)

Skips bits and moves current reading position forward.

Parameters:

n - The number of bits to skip.

readBit

public boolean readBit()

Reads a single bit.

Returns:

True if the bit is set. False otherwise.

readBits

public int readBits(int numBits)

Reads up to 32 bits.

Parameters:

numBits - The number of bits to read.

Returns:

An integer whose bottom n bits hold the read data.

canReadExpGolombCodedNum

public boolean canReadExpGolombCodedNum()

Returns whether it is possible to read an Exp-Golomb-coded integer starting from the current offset. The offset is not modified.

Returns:

Whether it is possible to read an Exp-Golomb-coded integer.

readUnsignedExpGolombCodedInt

public int readUnsignedExpGolombCodedInt()

Reads an unsigned Exp-Golomb-coded format integer.

Returns:

The value of the parsed Exp-Golomb-coded integer.

readSignedExpGolombCodedInt

public int readSignedExpGolombCodedInt()

Reads an signed Exp-Golomb-coded format integer.

Returns:

The value of the parsed Exp-Golomb-coded integer.