org.red5.io.m4a.impl
Class M4AReader

java.lang.Object
  org.red5.io.m4a.impl.M4AReader

All Implemented Interfaces:

IoConstants, ITagReader

public class M4AReader
extends Object
implements IoConstants, ITagReader

A Reader is used to read the contents of a M4A file. NOTE: This class is not implemented as threading-safe. The caller should make sure the threading-safety.

Author:

The Red5 Project ([email protected]), Paul Gregoire, ([email protected])

Field Summary

Fields inherited from interface org.red5.io.IoConstants

AVC_PACKET_TYPE_END_OF_SEQUENCE, AVC_PACKET_TYPE_NALU, AVC_PACKET_TYPE_SEQUENCE_HEADER, FLAG_CODEC_H263, FLAG_CODEC_SCREEN, FLAG_CODEC_VP6, FLAG_FORMAT_ADPCM, FLAG_FORMAT_MP3, FLAG_FORMAT_NELLYMOSER, FLAG_FORMAT_NELLYMOSER_8_KHZ, FLAG_FORMAT_RAW, FLAG_FRAMETYPE_DISPOSABLE, FLAG_FRAMETYPE_GENERATED_KEYFRAME, FLAG_FRAMETYPE_INFO, FLAG_FRAMETYPE_INTERFRAME, FLAG_FRAMETYPE_KEYFRAME, FLAG_RATE_11_KHZ, FLAG_RATE_22_KHZ, FLAG_RATE_44_KHZ, FLAG_RATE_48_KHZ, FLAG_RATE_5_5_KHZ, FLAG_SIZE_16_BIT, FLAG_SIZE_8_BIT, FLAG_TYPE_MONO, FLAG_TYPE_STEREO, INFO_PACKET_SEEK_END, INFO_PACKET_SEEK_START, MASK_SOUND_FORMAT, MASK_SOUND_RATE, MASK_SOUND_SIZE, MASK_SOUND_TYPE, MASK_VIDEO_CODEC, MASK_VIDEO_FRAMETYPE, TYPE_AUDIO, TYPE_ENCRYPTED, TYPE_ENCRYPTED_AUDIO, TYPE_ENCRYPTED_METADATA, TYPE_ENCRYPTED_VIDEO, TYPE_METADATA, TYPE_VIDEO

Constructor Summary

M4AReader(File f)
Creates M4A reader from file input stream, sets up metadata generation flag.

M4AReader(IoBuffer buffer)
Accepts mapped file bytes to construct internal members.

Method Summary

void	analyzeFrames() Performs frame analysis and generates metadata for use in seeking.
void	close() Closes the reader and free any allocated memory.
void	decodeHeader() This handles the moov atom being at the beginning or end of the file, so the mdat may also be before or after the moov atom.
String	getAudioCodecId()
long	getBytesRead() Returns the amount of bytes read
long	getDuration() Return length in seconds
IStreamableFile	getFile() Return the file that is loaded.
IoBuffer	getFileData() Returns the file buffer.
int	getOffset() Returns the offet length
long	getTotalBytes() Get the total readable bytes in a file or ByteBuffer
boolean	hasMoreTags() Returns a boolean stating whether the FLV has more tags
boolean	hasVideo() Check if the reader also has video tags.
void	position(long pos) Put the current position to pos.
ITag	readTag() Packages media data for return to providers.
ITag	readTagHeader()
void	setAudioCodecId(String audioCodecId)

Methods inherited from class java.lang.Object

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

Constructor Detail

M4AReader

public M4AReader(File f)
          throws IOException

Creates M4A reader from file input stream, sets up metadata generation flag.

Parameters:

f - File input stream

Throws:

IOException

M4AReader

public M4AReader(IoBuffer buffer)
          throws IOException

Accepts mapped file bytes to construct internal members.

Parameters:

buffer - Byte buffer

Throws:

IOException

Method Detail

decodeHeader

public void decodeHeader()

This handles the moov atom being at the beginning or end of the file, so the mdat may also be before or after the moov atom.

Specified by:

decodeHeader in interface ITagReader

getTotalBytes

public long getTotalBytes()

Description copied from interface: ITagReader

Get the total readable bytes in a file or ByteBuffer

Specified by:

getTotalBytes in interface ITagReader

Returns:

Total readable bytes

hasVideo

public boolean hasVideo()

Check if the reader also has video tags.

Specified by:

hasVideo in interface ITagReader

Returns:

has video

getFileData

public IoBuffer getFileData()

Returns the file buffer.

Returns:

File contents as byte buffer

getFile

public IStreamableFile getFile()

Return the file that is loaded.

Specified by:

getFile in interface ITagReader

Returns:

the file to be loaded

getOffset

public int getOffset()

Returns the offet length

Specified by:

getOffset in interface ITagReader

Returns:

int

getBytesRead

public long getBytesRead()

Returns the amount of bytes read

Specified by:

getBytesRead in interface ITagReader

Returns:

long

getDuration

public long getDuration()

Return length in seconds

Specified by:

getDuration in interface ITagReader

Returns:

length in seconds

getAudioCodecId

public String getAudioCodecId()

hasMoreTags

public boolean hasMoreTags()

Returns a boolean stating whether the FLV has more tags

Specified by:

hasMoreTags in interface ITagReader

Returns:

boolean

readTag

public ITag readTag()

Packages media data for return to providers.

Specified by:

readTag in interface ITagReader

Returns:

Tag

analyzeFrames

public void analyzeFrames()

Performs frame analysis and generates metadata for use in seeking. All the frames are analyzed and sorted together based on time and offset.

position

public void position(long pos)

Put the current position to pos. The caller must ensure the pos is a valid one.

Specified by:

position in interface ITagReader

Parameters:

pos - position to move to in file / channel

close

public void close()

Closes the reader and free any allocated memory.

Specified by:

close in interface ITagReader

setAudioCodecId

public void setAudioCodecId(String audioCodecId)

readTagHeader

public ITag readTagHeader()