Package org.opencastproject.workflow.handler.subtitletimeshift

Class SubtitleTimeshiftWorkflowOperationHandler

java.lang.Object

org.opencastproject.workflow.api.AbstractWorkflowOperationHandler

org.opencastproject.workflow.handler.subtitletimeshift.SubtitleTimeshiftWorkflowOperationHandler

All Implemented Interfaces:

WorkflowOperationHandler

public class SubtitleTimeshiftWorkflowOperationHandler
extends AbstractWorkflowOperationHandler

This workflow operation allows to shift the timestamps of subtitle files. For example: If someone adds a bumper/intro video in front of an already subtitled presenter track the subtitles would start too early. With this operation, you can select a video and a subtitle track and the timestamps of the subtitle file will be shifted backwards by the duration of the selected video.

Nested Class Summary

Nested classes/interfaces inherited from class org.opencastproject.workflow.api.AbstractWorkflowOperationHandler

AbstractWorkflowOperationHandler.Configuration

Field Summary

Fields inherited from class org.opencastproject.workflow.api.AbstractWorkflowOperationHandler

description, id, serviceRegistry, SOURCE_FLAVOR, SOURCE_FLAVORS, SOURCE_TAG, SOURCE_TAGS, TARGET_FLAVOR, TARGET_FLAVORS, TARGET_TAG, TARGET_TAGS

Constructor Summary

Constructors

Constructor	Description
SubtitleTimeshiftWorkflowOperationHandler()

Method Summary

Modifier and Type	Method	Description
void	setWorkspace(Workspace workspace)	OSGi setter for the workspace class
void	shiftTime(WebVTTSubtitle subtitleFile, long time)	Shifts all timestamps of a subtitle file by a given time.
WorkflowOperationResult	start(WorkflowInstance workflowInstance, JobContext context)	Runs the workflow operation on this WorkflowInstance.

Methods inherited from class org.opencastproject.workflow.api.AbstractWorkflowOperationHandler

activate, applyTargetTagsToElement, asList, createResult, createResult, createResult, createResult, destroy, equals, getCfg, getConfig, getConfig, getConfig, getDescription, getFileNameFromElements, getId, getOptConfig, getOptConfig, getTagsAndFlavors, hashCode, setJobBarrierPollingInterval, setServiceRegistry, skip, toString, waitForStatus, waitForStatus

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

SubtitleTimeshiftWorkflowOperationHandler

public SubtitleTimeshiftWorkflowOperationHandler()

Method Details

setWorkspace

public void setWorkspace(Workspace workspace)

OSGi setter for the workspace class

Parameters:

workspace - an instance of the workspace

start

public WorkflowOperationResult start(WorkflowInstance workflowInstance,
 JobContext context)
                              throws WorkflowOperationException

Description copied from class: AbstractWorkflowOperationHandler

Runs the workflow operation on this WorkflowInstance. If the execution fails for some reason, this must throw a WorkflowOperationException in order to handle the problem gracefully. Runtime exceptions will cause the entire workflow instance to fail.

Specified by:

start in interface WorkflowOperationHandler

Specified by:

start in class AbstractWorkflowOperationHandler

Parameters:

workflowInstance - the workflow instance

context - the job context

Returns:

the WorkflowOperationResult containing a potentially modified MediaPackage and whether to put the workflow instance into a wait state.

Throws:

WorkflowOperationException - If the workflow operation fails to execute properly, and the default error handling should be invoked.

See Also:

• WorkflowOperationHandler.start(org.opencastproject.workflow.api.WorkflowInstance, JobContext)

shiftTime

public void shiftTime(WebVTTSubtitle subtitleFile,
 long time)

Shifts all timestamps of a subtitle file by a given time.

Parameters:

time - Time in milliseconds by which all timestamps shall be shifted.