org.jaudiotagger.audio.mp4.atom
Class Mp4EsdsBox

java.lang.Object
  org.jaudiotagger.audio.mp4.atom.AbstractMp4Box
      org.jaudiotagger.audio.mp4.atom.Mp4EsdsBox

public class Mp4EsdsBox
extends AbstractMp4Box

EsdsBox ( stream specific description box), usually holds the Bitrate/No of Channels

It contains a number of (possibly optional?) sections (section 3 - 6) (containing optional filler) with differeent info in each section.

-> 4 bytes version/flags = 8-bit hex version + 24-bit hex flags (current = 0)

Section 3 -> 1 byte ES descriptor type tag = 8-bit hex value 0x03 -> 3 bytes optional extended descriptor type tag string = 3 * 8-bit hex value - types are 0x80,0x81,0xFE -> 1 byte descriptor type length = 8-bit unsigned length -> 2 bytes ES ID = 16-bit unsigned value -> 1 byte stream priority = 8-bit unsigned value - Defaults to 16 and ranges from 0 through to 31

Section 4 -> 1 byte decoder config descriptor type tag = 8-bit hex value 0x04 -> 3 bytes optional extended descriptor type tag string = 3 * 8-bit hex value - types are 0x80,0x81,0xFE -> 1 byte descriptor type length = 8-bit unsigned length * -> 1 byte object type ID = 8-bit unsigned value -> 6 bits stream type = 3/4 byte hex value - type IDs are object descript. = 1 ; clock ref. = 2 - type IDs are scene descript. = 4 ; visual = 4 - type IDs are audio = 5 ; MPEG-7 = 6 ; IPMP = 7 - type IDs are OCI = 8 ; MPEG Java = 9 - type IDs are user private = 32 -> 1 bit upstream flag = 1/8 byte hex value -> 1 bit reserved flag = 1/8 byte hex value set to 1 -> 3 bytes buffer size = 24-bit unsigned value -> 4 bytes maximum bit rate = 32-bit unsigned value -> 4 bytes average bit rate = 32-bit unsigned value

Section 5 -> 1 byte decoder specific descriptor type tag 8-bit hex value 0x05 -> 3 bytes optional extended descriptor type tag string = 3 * 8-bit hex value - types are 0x80,0x81,0xFE -> 1 byte descriptor type length = 8-bit unsigned length -> 1 byte Audio profile Id - 5 bits Profile Id - 3 bits Unknown -> 8 bits other flags - 3 bits unknown - 2 bits is No of Channels - 3 bits unknown

Section 6

-> 1 byte SL config descriptor type tag = 8-bit hex value 0x06 -> 3 bytes optional extended descriptor type tag string = 3 * 8-bit hex value - types are 0x80,0x81,0xFE -> 1 byte descriptor type length = 8-bit unsigned length -> 1 byte SL value = 8-bit hex value set to 0x02

Nested Class Summary

static class	Mp4EsdsBox.AudioProfile Audio profile, held in Section 5 this is usually type LOW_COMPLEXITY
static class	Mp4EsdsBox.Kind File type, held in Section 4 , only really expecting type 0x64 (AAC)

Field Summary

private Mp4EsdsBox.AudioProfile	audioProfile
private static java.util.Map<java.lang.Integer,Mp4EsdsBox.AudioProfile>	audioProfileMap
static int	AVERAGE_BITRATE_LENGTH
private int	avgBitrate
static int	BUFFER_SIZE_LENGTH
static int	CHANNEL_FLAGS_LENGTH
static int	CONFIG_TYPE_LENGTH
static int	DESCRIPTOR_OBJECT_TYPE_LENGTH
static int	DESCRIPTOR_TYPE_LENGTH
static int	ES_ID_LENGTH
private static int	FILLER_END
private static int	FILLER_OTHER
private static int	FILLER_START
private Mp4EsdsBox.Kind	kind
private static java.util.Map<java.lang.Integer,Mp4EsdsBox.Kind>	kindMap
static int	MAX_BITRATE_LENGTH
private int	maxBitrate
private int	numberOfChannels
static int	OBJECT_TYPE_LENGTH
static int	OTHER_FLAG_LENGTH
private static int	SECTION_FIVE
private static int	SECTION_FOUR
private static int	SECTION_SIX
private static int	SECTION_THREE
static int	STREAM_PRIORITY_LENGTH
static int	STREAM_TYPE_LENGTH
static int	VERSION_FLAG_LENGTH

Fields inherited from class org.jaudiotagger.audio.mp4.atom.AbstractMp4Box

dataBuffer, header

Constructor Summary

Mp4EsdsBox(Mp4BoxHeader header, java.nio.ByteBuffer dataBuffer)
DataBuffer must start from from the start of the body

Method Summary

Mp4EsdsBox.AudioProfile	getAudioProfile() Get audio profile, usually AAC Low Complexity
int	getAvgBitrate()
Mp4EsdsBox.Kind	getKind() Only expext MPG_Audio, TODO shouldnt matter if another type of audio, but something gone wrong if type of video
int	getMaxBitrate()
int	getNumberOfChannels()
int	processSectionHeader(java.nio.ByteBuffer dataBuffer) Process header, skipping filler bytes and calculating size

Methods inherited from class org.jaudiotagger.audio.mp4.atom.AbstractMp4Box

getData, getHeader

Methods inherited from class java.lang.Object

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

Field Detail

VERSION_FLAG_LENGTH

public static final int VERSION_FLAG_LENGTH

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Constant Field Values

OTHER_FLAG_LENGTH

public static final int OTHER_FLAG_LENGTH

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Constant Field Values

DESCRIPTOR_TYPE_LENGTH

public static final int DESCRIPTOR_TYPE_LENGTH

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Constant Field Values

ES_ID_LENGTH

public static final int ES_ID_LENGTH

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Constant Field Values

STREAM_PRIORITY_LENGTH

public static final int STREAM_PRIORITY_LENGTH

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Constant Field Values

CONFIG_TYPE_LENGTH

public static final int CONFIG_TYPE_LENGTH

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Constant Field Values

OBJECT_TYPE_LENGTH

public static final int OBJECT_TYPE_LENGTH

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Constant Field Values

STREAM_TYPE_LENGTH

public static final int STREAM_TYPE_LENGTH

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Constant Field Values

BUFFER_SIZE_LENGTH

public static final int BUFFER_SIZE_LENGTH

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Constant Field Values

MAX_BITRATE_LENGTH

public static final int MAX_BITRATE_LENGTH

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Constant Field Values

AVERAGE_BITRATE_LENGTH

public static final int AVERAGE_BITRATE_LENGTH

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Constant Field Values

DESCRIPTOR_OBJECT_TYPE_LENGTH

public static final int DESCRIPTOR_OBJECT_TYPE_LENGTH

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Constant Field Values

CHANNEL_FLAGS_LENGTH

public static final int CHANNEL_FLAGS_LENGTH

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Constant Field Values

kind

private Mp4EsdsBox.Kind kind

audioProfile

private Mp4EsdsBox.AudioProfile audioProfile

numberOfChannels

private int numberOfChannels

maxBitrate

private int maxBitrate

avgBitrate

private int avgBitrate

SECTION_THREE

private static final int SECTION_THREE

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Constant Field Values

SECTION_FOUR

private static final int SECTION_FOUR

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SECTION_FIVE

private static final int SECTION_FIVE

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SECTION_SIX

private static final int SECTION_SIX

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Constant Field Values

FILLER_START

private static final int FILLER_START

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Constant Field Values

FILLER_OTHER

private static final int FILLER_OTHER

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Constant Field Values

FILLER_END

private static final int FILLER_END

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Constant Field Values

kindMap

private static java.util.Map<java.lang.Integer,Mp4EsdsBox.Kind> kindMap

audioProfileMap

private static java.util.Map<java.lang.Integer,Mp4EsdsBox.AudioProfile> audioProfileMap

Constructor Detail

Mp4EsdsBox

public Mp4EsdsBox(Mp4BoxHeader header,
                  java.nio.ByteBuffer dataBuffer)

DataBuffer must start from from the start of the body

Parameters:

header - header info

dataBuffer - data of box (doesnt include header data)

Method Detail

getNumberOfChannels

public int getNumberOfChannels()

getMaxBitrate

public int getMaxBitrate()

Returns:

maximum bit rate (bps)

getAvgBitrate

public int getAvgBitrate()

Returns:

average bit rate (bps)

processSectionHeader

public int processSectionHeader(java.nio.ByteBuffer dataBuffer)

Process header, skipping filler bytes and calculating size

Parameters:

dataBuffer -

Returns:

section header

getKind

public Mp4EsdsBox.Kind getKind()

Only expext MPG_Audio, TODO shouldnt matter if another type of audio, but something gone wrong if type of video

Returns:

the file type for the track

getAudioProfile

public Mp4EsdsBox.AudioProfile getAudioProfile()

Get audio profile, usually AAC Low Complexity

Returns:

the audio profile