org.jitsi.impl.neomedia.codec.audio

Class AbstractFFmpegAudioCodec

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.audio.AbstractFFmpegAudioCodec

All Implemented Interfaces:

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

Direct Known Subclasses:

FFmpegAudioDecoder, FFmpegAudioEncoder

public abstract class AbstractFFmpegAudioCodec
extends AbstractCodec2

Implements an audio Codec using the FFmpeg library.

Author:

Lyubomir Marinov

Field Summary

Fields

Modifier and Type	Field and Description
protected long	avctx The AVCodecContext which performs the actual encoding/decoding and which is the native counterpart of this open AbstractFFmpegAudioCodec.
protected int	codecID The AVCodecID of avctx.
protected int	frameSizeInBytes The number of bytes of audio data to be encoded with a single call to FFmpeg.avcodec_encode_audio(long, byte[], int, int, byte[], int) based on the frame_size of avctx.

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

Modifier	Constructor and Description
protected	AbstractFFmpegAudioCodec(String name, int codecID, javax.media.Format[] supportedOutputFormats) Initializes a new AbstractFFmpegAudioCodec instance with a specific PlugIn name, a specific AVCodecID, and a specific list of Formats supported as output.

Method Summary

Modifier and Type	Method and Description
static String	codecIDToString(int codecID) Returns a String representation of a specific AVCodecID.
protected void	configureAVCodecContext(long avctx, javax.media.format.AudioFormat format) Configures the AVCodecContext initialized in doOpen() prior to invoking one of the FFmpeg functions in the avcodec_open family.
protected void	doClose()
protected void	doOpen() Opens this Codec and acquires the resources that it needs to operate.
protected abstract long	findAVCodec(int codecID) Finds an AVCodec with a specific AVCodecID.
protected abstract javax.media.format.AudioFormat	getAVCodecContextFormat() Gets the AudioFormat with which avctx is to be configured and opened by doOpen().

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

calculateLostSeqNoCount, close, discardOutputBuffer, doProcess, 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.PlugIn

reset

Methods inherited from interface javax.media.Controls

getControl, getControls

Field Detail

avctx

protected long avctx

The AVCodecContext which performs the actual encoding/decoding and which is the native counterpart of this open AbstractFFmpegAudioCodec.

codecID

protected final int codecID

The AVCodecID of avctx.

frameSizeInBytes

protected int frameSizeInBytes

The number of bytes of audio data to be encoded with a single call to FFmpeg.avcodec_encode_audio(long, byte[], int, int, byte[], int) based on the frame_size of avctx.

Constructor Detail

AbstractFFmpegAudioCodec

protected AbstractFFmpegAudioCodec(String name,
                                   int codecID,
                                   javax.media.Format[] supportedOutputFormats)

Initializes a new AbstractFFmpegAudioCodec instance with a specific PlugIn name, a specific AVCodecID, and a specific list of Formats supported as output.

Parameters:

name - the PlugIn name of the new instance

codecID - the AVCodecID of the FFmpeg codec to be represented by the new instance

supportedOutputFormats - the list of Formats supported by the new instance as output

Method Detail

codecIDToString

public static String codecIDToString(int codecID)

Returns a String representation of a specific AVCodecID.

Parameters:

codecID - the AVCodecID to represent as a String

Returns:

a String representation of the specified codecID

configureAVCodecContext

protected void configureAVCodecContext(long avctx,
                                       javax.media.format.AudioFormat format)

Configures the AVCodecContext initialized in doOpen() prior to invoking one of the FFmpeg functions in the avcodec_open family. Allows extenders to override and provide additional, optional configuration.

Parameters:

avctx - the AVCodecContext to configure

format - the AudioFormat with which avctx is being configured

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

findAVCodec

protected abstract long findAVCodec(int codecID)

Finds an AVCodec with a specific AVCodecID. The method is invoked by doOpen() in order to (eventually) open a new AVCodecContext.

Parameters:

codecID - the AVCodecID of the AVCodec to find

Returns:

an AVCodec with the specified codecID or 0

getAVCodecContextFormat

protected abstract javax.media.format.AudioFormat getAVCodecContextFormat()

Gets the AudioFormat with which avctx is to be configured and opened by doOpen().

Returns:

the AudioFormat with which avctx is to be configured and opened by doOpen()