com.google.android.exoplayer2.util

Class ParsableNalUnitBitArray

java.lang.Object

com.google.android.exoplayer2.util.ParsableNalUnitBitArray

public final class ParsableNalUnitBitArray
extends java.lang.Object

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

Whenever the byte sequence [0, 0, 3] appears in the wrapped byte array, it is treated as [0, 0] for all reading/skipping operations, which makes the bitstream appear to be unescaped.

Constructor Summary

Constructors

Constructor and Description
ParsableNalUnitBitArray(byte[] data, int offset, int limit)

Method Summary

Modifier and Type	Method and Description
boolean	canReadBits(int numBits) Returns whether it's possible to read n bits starting from the current offset.
boolean	canReadExpGolombCodedNum() Returns whether it is possible to read an Exp-Golomb-coded integer starting from the current 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, int offset, int limit) Resets the wrapped data, limit and offset.
void	skipBit() Skips a single bit.
void	skipBits(int numBits) 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

Constructor Detail

ParsableNalUnitBitArray

public ParsableNalUnitBitArray(byte[] data,
                               int offset,
                               int limit)

Parameters:

data - The data to wrap.

offset - The byte offset in data to start reading from.

limit - The byte offset of the end of the bitstream in data.

Method Detail

reset

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

Resets the wrapped data, limit and offset.

Parameters:

data - The data to wrap.

offset - The byte offset in data to start reading from.

limit - The byte offset of the end of the bitstream in data.

skipBit

public void skipBit()

Skips a single bit.

skipBits

public void skipBits(int numBits)

Skips bits and moves current reading position forward.

Parameters:

numBits - The number of bits to skip.

canReadBits

public boolean canReadBits(int numBits)

Returns whether it's possible to read n bits starting from the current offset. The offset is not modified.

Parameters:

numBits - The number of bits.

Returns:

Whether it is possible to read n bits.

readBit

public boolean readBit()

Reads a single bit.

Returns:

Whether the bit is set.

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.