Package org.jitsi.impl.neomedia.codec.video.vp8

Class DePacketizer

java.lang.Object

net.sf.fmj.media.AbstractControls

net.sf.fmj.media.AbstractPlugIn

net.sf.fmj.media.AbstractCodec

org.jitsi.impl.neomedia.codec.AbstractCodec2

org.jitsi.impl.neomedia.codec.video.vp8.DePacketizer

All Implemented Interfaces:

javax.media.Codec, javax.media.Controls, javax.media.PlugIn

public class DePacketizer
extends AbstractCodec2

A depacketizer from VP8. See draft-ietf-payload-vp8-11

Author:

Boris Grozev, George Politis

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DePacketizer.VP8KeyframeHeader	A class that represents a keyframe header structure (see RFC 6386, paragraph 9.1).
static class	DePacketizer.VP8PayloadDescriptor	A class that represents the VP8 Payload Descriptor structure defined in draft-ietf-payload-vp8-10
static class	DePacketizer.VP8PayloadHeader	A class that represents the VP8 Payload Header structure defined in draft-ietf-payload-vp8-10

Field Summary

Fields inherited from class org.jitsi.impl.neomedia.codec.AbstractCodec2

BUFFER_FLAG_FEC, BUFFER_FLAG_PLC, EMPTY_FORMATS, features, MAX_AUDIO_SEQUENCE_NUMBERS_TO_PLC, SEQUENCE_MAX, SEQUENCE_MIN

Fields inherited from class net.sf.fmj.media.AbstractCodec

inputFormat, inputFormats, opened, outputFormat

Fields inherited from interface javax.media.PlugIn

BUFFER_PROCESSED_FAILED, BUFFER_PROCESSED_OK, INPUT_BUFFER_NOT_CONSUMED, OUTPUT_BUFFER_NOT_FILLED, PLUGIN_TERMINATED

Constructor Summary

Constructors

Constructor	Description
DePacketizer()	Initializes a new JNIEncoder instance.

Method Summary

Modifier and Type	Method	Description
protected void	doClose()
protected void	doOpen()	Opens this Codec and acquires the resources that it needs to operate.
protected int	doProcess(javax.media.Buffer inBuffer, javax.media.Buffer outBuffer)
static boolean	isKeyFrame(byte[] buf, int off, int len)	Returns true if the buffer contains a VP8 key frame at offset offset.

Methods inherited from class org.jitsi.impl.neomedia.codec.AbstractCodec2

calculateLostSeqNoCount, close, discardOutputBuffer, getMatchingOutputFormats, getName, getSupportedOutputFormats, incrementSeqNo, matches, open, process, setInputFormat, setOutputFormat, specialize, updateOutput, validateByteArraySize, validateShortArraySize

Methods inherited from class net.sf.fmj.media.AbstractCodec

checkInputBuffer, dump, getInputFormat, getOutputFormat, getSupportedInputFormats, isEOM, propagateEOM

Methods inherited from class net.sf.fmj.media.AbstractPlugIn

reset

Methods inherited from class net.sf.fmj.media.AbstractControls

addControl, getControl, getControls, removeControl

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.media.Controls

getControl, getControls

Methods inherited from interface javax.media.PlugIn

reset

Constructor Detail

DePacketizer

public DePacketizer()

Initializes a new JNIEncoder instance.

Method Detail

doClose

protected void doClose()

Specified by:

doClose in class AbstractCodec2

doOpen

protected void doOpen()
               throws javax.media.ResourceUnavailableException

Opens this Codec and acquires the resources that it needs to operate. A call to PlugIn.open() on this instance will result in a call to doOpen only if AbstractCodec.opened is false. All required input and/or output formats are assumed to have been set on this Codec before doOpen is called.

Specified by:

doOpen in class AbstractCodec2

Throws:

javax.media.ResourceUnavailableException - if any of the resources that this Codec needs to operate cannot be acquired

doProcess

protected int doProcess(javax.media.Buffer inBuffer,
                        javax.media.Buffer outBuffer)

Specified by:

doProcess in class AbstractCodec2

isKeyFrame

public static boolean isKeyFrame(byte[] buf,
                                 int off,
                                 int len)

Returns true if the buffer contains a VP8 key frame at offset offset.

Parameters:

buf - the byte buffer to check

off - the offset in the byte buffer where the actual data starts

len - the length of the data in the byte buffer

Returns:

true if the buffer contains a VP8 key frame at offset offset.