Package ws.schild.jave

Class Encoder

java.lang.Object

ws.schild.jave.Encoder

public class Encoder
extends Object

Main class of the package. Instances can encode audio and video streams.

Author:

Carlo Pelliccia

Constructor Summary

Constructors

Constructor	Description
Encoder()	It builds an encoder using a DefaultFFMPEGLocator instance to locate the ffmpeg executable to use.
Encoder(FFMPEGLocator locator)	It builds an encoder with a custom FFMPEGLocator.

Method Summary

Modifier and Type	Method	Description
void	abortEncoding()	Force the encoding process to stop
void	encode(MultimediaObject multimediaObject, File target, EncodingAttributes attributes)	Re-encode a multimedia file.
void	encode(MultimediaObject multimediaObject, File target, EncodingAttributes attributes, EncoderProgressListener listener)	Re-encode a multimedia file.
String[]	getAudioDecoders()	Returns a list with the names of all the audio decoders bundled with the ffmpeg distribution in use.
String[]	getAudioEncoders()	Returns a list with the names of all the audio encoders bundled with the ffmpeg distribution in use.
protected String[]	getCoders(boolean encoder, boolean audio)	Returns a list with the names of all the coders bundled with the ffmpeg distribution in use.
protected String[]	getSupportedCodingFormats(boolean encoding)	Returns a list with the names of all the file formats supported at en/de-coding time by the underlying ffmpeg distribution.A multimedia file could be encoded and generated only if the specified format is in this list.
String[]	getSupportedDecodingFormats()	Returns a list with the names of all the file formats supported at decoding time by the underlying ffmpeg distribution.
String[]	getSupportedEncodingFormats()	Returns a list with the names of all the file formats supported at encoding time by the underlying ffmpeg distribution.
List<String>	getUnhandledMessages()	Return the list of unhandled output messages of the ffmpeng encoder run
String[]	getVideoDecoders()	Returns a list with the names of all the video decoders bundled with the ffmpeg distribution in use.
String[]	getVideoEncoders()	Returns a list with the names of all the video encoders bundled with the ffmpeg distribution in use.

Methods inherited from class java.lang.Object

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

Constructor Detail

Encoder

public Encoder()

It builds an encoder using a DefaultFFMPEGLocator instance to locate the ffmpeg executable to use.

Encoder

public Encoder(FFMPEGLocator locator)

It builds an encoder with a custom FFMPEGLocator.

Parameters:

locator - The locator picking up the ffmpeg executable used by the encoder.

Method Detail

getAudioDecoders

public String[] getAudioDecoders()
                          throws EncoderException

Returns a list with the names of all the audio decoders bundled with the ffmpeg distribution in use. An audio stream can be decoded only if a decoder for its format is available.

Returns:

A list with the names of all the included audio decoders.

Throws:

EncoderException - If a problem occurs calling the underlying ffmpeg executable.

getAudioEncoders

public String[] getAudioEncoders()
                          throws EncoderException

Returns a list with the names of all the audio encoders bundled with the ffmpeg distribution in use. An audio stream can be encoded using one of these encoders.

Returns:

A list with the names of all the included audio encoders.

Throws:

EncoderException - If a problem occurs calling the underlying ffmpeg executable.

getCoders

protected String[] getCoders(boolean encoder,
                             boolean audio)
                      throws EncoderException

Returns a list with the names of all the coders bundled with the ffmpeg distribution in use.

Parameters:

encoder - Do search encoders, else decoders

audio - Do search for audio encodes, else video

Returns:

A list with the names of all the included encoders

Throws:

EncoderException - If a problem occurs calling the underlying ffmpeg executable.

getVideoDecoders

public String[] getVideoDecoders()
                          throws EncoderException

Returns a list with the names of all the video decoders bundled with the ffmpeg distribution in use. A video stream can be decoded only if a decoder for its format is available.

Returns:

A list with the names of all the included video decoders.

Throws:

EncoderException - If a problem occurs calling the underlying ffmpeg executable.

getVideoEncoders

public String[] getVideoEncoders()
                          throws EncoderException

Returns a list with the names of all the video encoders bundled with the ffmpeg distribution in use. A video stream can be encoded using one of these encoders.

Returns:

A list with the names of all the included video encoders.

Throws:

EncoderException - If a problem occurs calling the underlying ffmpeg executable.

getSupportedEncodingFormats

public String[] getSupportedEncodingFormats()
                                     throws EncoderException

Returns a list with the names of all the file formats supported at encoding time by the underlying ffmpeg distribution. A multimedia file could be encoded and generated only if the specified format is in this list.

Returns:

A list with the names of all the supported file formats at encoding time.

Throws:

EncoderException - If a problem occurs calling the underlying ffmpeg executable.

getSupportedCodingFormats

protected String[] getSupportedCodingFormats(boolean encoding)
                                      throws EncoderException

Returns a list with the names of all the file formats supported at en/de-coding time by the underlying ffmpeg distribution.A multimedia file could be encoded and generated only if the specified format is in this list.

Parameters:

encoding - True for encoding job, false to decode a file

Returns:

A list with the names of all the supported file formats at encoding time.

Throws:

EncoderException - If a problem occurs calling the underlying ffmpeg executable.

getSupportedDecodingFormats

public String[] getSupportedDecodingFormats()
                                     throws EncoderException

Returns a list with the names of all the file formats supported at decoding time by the underlying ffmpeg distribution. A multimedia file could be open and decoded only if its format is in this list.

Returns:

A list with the names of all the supported file formats at decoding time.

Throws:

EncoderException - If a problem occurs calling the underlying ffmpeg executable.

encode

public void encode(MultimediaObject multimediaObject,
                   File target,
                   EncodingAttributes attributes)
            throws IllegalArgumentException,
                   InputFormatException,
                   EncoderException

Re-encode a multimedia file. This method is not reentrant, instead create multiple object instances

Parameters:

multimediaObject - The source multimedia file. It cannot be null. Be sure this file can be decoded (see null null null null getSupportedDecodingFormats(), getAudioDecoders() and getVideoDecoders()).

target - The target multimedia re-encoded file. It cannot be null. If this file already exists, it will be overwrited.

attributes - A set of attributes for the encoding process.

Throws:

IllegalArgumentException - If both audio and video parameters are null.

InputFormatException - If the source multimedia file cannot be decoded.

EncoderException - If a problems occurs during the encoding process.

encode

public void encode(MultimediaObject multimediaObject,
                   File target,
                   EncodingAttributes attributes,
                   EncoderProgressListener listener)
            throws IllegalArgumentException,
                   InputFormatException,
                   EncoderException

Re-encode a multimedia file. This method is not reentrant, instead create multiple object instances

Parameters:

multimediaObject - The source multimedia file. It cannot be null. Be sure this file can be decoded (see null null null null getSupportedDecodingFormats(), getAudioDecoders() and getVideoDecoders()).

target - The target multimedia re-encoded file. It cannot be null. If this file already exists, it will be overwrited.

attributes - A set of attributes for the encoding process.

listener - An optional progress listener for the encoding process. It can be null.

Throws:

IllegalArgumentException - If both audio and video parameters are null.

InputFormatException - If the source multimedia file cannot be decoded.

EncoderException - If a problems occurs during the encoding process.

getUnhandledMessages

public List<String> getUnhandledMessages()

Return the list of unhandled output messages of the ffmpeng encoder run

Returns:

the unhandledMessages list of unhandled messages, can be null or empty

abortEncoding

public void abortEncoding()

Force the encoding process to stop