Package com.google.android.exoplayer2.util

Class ParsableNalUnitBitArray

  • public final class ParsableNalUnitBitArray
extends 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 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.