org.red5.io.mp4.impl

Class MP4Reader

java.lang.Object

org.red5.io.mp4.impl.MP4Reader

All Implemented Interfaces:

IKeyFrameDataAnalyzer, IoConstants, ITagReader

public class MP4Reader
extends Object
implements IoConstants, ITagReader, IKeyFrameDataAnalyzer

This reader is used to read the contents of an MP4 file.
NOTE: This class is not implemented as thread-safe, the caller should ensure the thread-safety.
New NetStream notifications
Two new notifications facilitate the implementation of the playback components:

• NetStream.Play.FileStructureInvalid: This event is sent if the player detects an MP4 with an invalid file structure. Flash Player cannot play files that have invalid file structures.
• NetStream.Play.NoSupportedTrackFound: This event is sent if the player does not detect any supported tracks. If there aren't any supported video, audio or data tracks found, Flash Player does not play the file.

Author:

The Red5 Project, Paul Gregoire (mondain@gmail.com)

Nested Class Summary

Nested classes/interfaces inherited from interface org.red5.io.flv.IKeyFrameDataAnalyzer

IKeyFrameDataAnalyzer.KeyFrameMeta

Field Summary

Fields

Modifier and Type	Field and Description
static byte[]	EMPTY_AAC Blank AAC data
static byte[]	PREFIX_AUDIO_CONFIG_FRAME Audio packet prefix for the decoder frame
static byte[]	PREFIX_AUDIO_FRAME Audio packet prefix
static byte[]	PREFIX_VIDEO_CONFIG_FRAME Video packet prefix for the decoder frame
static byte[]	PREFIX_VIDEO_FRAME Video packet prefix for standard frames (interframe)
static byte[]	PREFIX_VIDEO_KEYFRAME Video packet prefix for key frames

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

Constructors

Constructor and Description
MP4Reader(File f) Creates MP4 reader from file input stream, sets up metadata generation flag.

Method Summary

Modifier and Type	Method and Description
void	analyzeFrames() Performs frame analysis and generates metadata for use in seeking.
IKeyFrameDataAnalyzer.KeyFrameMeta	analyzeKeyFrames() Analyze and return keyframe metadata.
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.
static void	dumpBox(org.mp4parser.Container box) Dumps the children of a container box.
String	getAudioCodecId()
long	getBytesRead() Returns the amount of bytes read
long	getDuration() Return length in seconds
IStreamableFile	getFile() Return the file that is loaded.
org.apache.mina.core.buffer.IoBuffer	getFileData() Returns the file buffer.
int	getOffset() Returns the offet length
long	getTotalBytes() Get the total readable bytes in a file or IoBuffer.
String	getVideoCodecId()
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)
void	setVideoCodecId(String videoCodecId)

Methods inherited from class java.lang.Object

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

Field Detail

PREFIX_AUDIO_CONFIG_FRAME

public static final byte[] PREFIX_AUDIO_CONFIG_FRAME

Audio packet prefix for the decoder frame

PREFIX_AUDIO_FRAME

public static final byte[] PREFIX_AUDIO_FRAME

Audio packet prefix

EMPTY_AAC

public static final byte[] EMPTY_AAC

Blank AAC data

PREFIX_VIDEO_CONFIG_FRAME

public static final byte[] PREFIX_VIDEO_CONFIG_FRAME

Video packet prefix for the decoder frame

PREFIX_VIDEO_KEYFRAME

public static final byte[] PREFIX_VIDEO_KEYFRAME

Video packet prefix for key frames

PREFIX_VIDEO_FRAME

public static final byte[] PREFIX_VIDEO_FRAME

Video packet prefix for standard frames (interframe)

Constructor Detail

MP4Reader

public MP4Reader(File f)
          throws IOException

Creates MP4 reader from file input stream, sets up metadata generation flag.

Parameters:

f - File input stream

Throws:

IOException - on IO exception

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

dumpBox

public static void dumpBox(org.mp4parser.Container box)

Dumps the children of a container box.

Parameters:

box - mp4 box

getTotalBytes

public long getTotalBytes()

Get the total readable bytes in a file or IoBuffer.

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 org.apache.mina.core.buffer.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

getVideoCodecId

public String getVideoCodecId()

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

setVideoCodecId

public void setVideoCodecId(String videoCodecId)

setAudioCodecId

public void setAudioCodecId(String audioCodecId)

readTagHeader

public ITag readTagHeader()

analyzeKeyFrames

public IKeyFrameDataAnalyzer.KeyFrameMeta analyzeKeyFrames()

Description copied from interface: IKeyFrameDataAnalyzer

Analyze and return keyframe metadata.

Specified by:

analyzeKeyFrames in interface IKeyFrameDataAnalyzer

Returns:

Metadata object