com.google.android.exoplayer2.util

Class CodecSpecificDataUtil

java.lang.Object

com.google.android.exoplayer2.util.CodecSpecificDataUtil

public final class CodecSpecificDataUtil
extends java.lang.Object

Provides static utility methods for manipulating various types of codec specific data.

Method Summary

Modifier and Type	Method and Description
static byte[]	buildAacAudioSpecificConfig(int audioObjectType, int sampleRateIndex, int channelConfig) Builds a simple AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1
static byte[]	buildAacLcAudioSpecificConfig(int sampleRate, int numChannels) Builds a simple HE-AAC LC AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1
static java.lang.String	buildAvcCodecString(int profileIdc, int constraintsFlagsAndReservedZero2Bits, int levelIdc) Builds an RFC 6381 AVC codec string using the provided parameters.
static byte[]	buildNalUnit(byte[] data, int offset, int length) Constructs a NAL unit consisting of the NAL start code followed by the specified data.
static android.util.Pair<java.lang.Integer,java.lang.Integer>	parseAacAudioSpecificConfig(byte[] audioSpecificConfig) Parses an AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1
static android.util.Pair<java.lang.Integer,java.lang.Integer>	parseAacAudioSpecificConfig(ParsableBitArray bitArray, boolean forceReadToEnd) Parses an AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1
static byte[][]	splitNalUnits(byte[] data) Splits an array of NAL units.

Methods inherited from class java.lang.Object

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

Method Detail

parseAacAudioSpecificConfig

public static android.util.Pair<java.lang.Integer,java.lang.Integer> parseAacAudioSpecificConfig(byte[] audioSpecificConfig)
                                                                                          throws ParserException

Parses an AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1

Parameters:

audioSpecificConfig - A byte array containing the AudioSpecificConfig to parse.

Returns:

A pair consisting of the sample rate in Hz and the channel count.

Throws:

ParserException - If the AudioSpecificConfig cannot be parsed as it's not supported.

parseAacAudioSpecificConfig

public static android.util.Pair<java.lang.Integer,java.lang.Integer> parseAacAudioSpecificConfig(ParsableBitArray bitArray,
                                                                                                 boolean forceReadToEnd)
                                                                                          throws ParserException

Parses an AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1

Parameters:

bitArray - A ParsableBitArray containing the AudioSpecificConfig to parse. The position is advanced to the end of the AudioSpecificConfig.

forceReadToEnd - Whether the entire AudioSpecificConfig should be read. Required for knowing the length of the configuration payload.

Returns:

A pair consisting of the sample rate in Hz and the channel count.

Throws:

ParserException - If the AudioSpecificConfig cannot be parsed as it's not supported.

buildAacLcAudioSpecificConfig

public static byte[] buildAacLcAudioSpecificConfig(int sampleRate,
                                                   int numChannels)

Builds a simple HE-AAC LC AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1

Parameters:

sampleRate - The sample rate in Hz.

numChannels - The number of channels.

Returns:

The AudioSpecificConfig.

buildAacAudioSpecificConfig

public static byte[] buildAacAudioSpecificConfig(int audioObjectType,
                                                 int sampleRateIndex,
                                                 int channelConfig)

Builds a simple AudioSpecificConfig, as defined in ISO 14496-3 1.6.2.1

Parameters:

audioObjectType - The audio object type.

sampleRateIndex - The sample rate index.

channelConfig - The channel configuration.

Returns:

The AudioSpecificConfig.

buildAvcCodecString

public static java.lang.String buildAvcCodecString(int profileIdc,
                                                   int constraintsFlagsAndReservedZero2Bits,
                                                   int levelIdc)

Builds an RFC 6381 AVC codec string using the provided parameters.

Parameters:

profileIdc - The encoding profile.

constraintsFlagsAndReservedZero2Bits - The constraint flags followed by the reserved zero 2 bits, all contained in the least significant byte of the integer.

levelIdc - The encoding level.

Returns:

An RFC 6381 AVC codec string built using the provided parameters.

buildNalUnit

public static byte[] buildNalUnit(byte[] data,
                                  int offset,
                                  int length)

Constructs a NAL unit consisting of the NAL start code followed by the specified data.

Parameters:

data - An array containing the data that should follow the NAL start code.

offset - The start offset into data.

length - The number of bytes to copy from data

Returns:

The constructed NAL unit.

splitNalUnits

@Nullable
public static byte[][] splitNalUnits(byte[] data)

Splits an array of NAL units.

If the input consists of NAL start code delimited units, then the returned array consists of the split NAL units, each of which is still prefixed with the NAL start code. For any other input, null is returned.

Parameters:

data - An array of data.

Returns:

The individual NAL units, or null if the input did not consist of NAL start code delimited units.