Class: JSVideo

JSVideo

new JSVideo()

Creates a video player pointing to files specified by the url
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Methods

CreateVideoCanvas()

This function creates the html elements (display, scroll bar and buttons) for the video player
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DisplayFrame(i)

This function displays the frame at position i, as well as the annotations corresponding to such frame. If such frame is not available, it pauses the player, loads a chunk of frames starting from i and replays.
Parameters:
Name Type Description
i int the index of the frame to be displayed
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GenerateFrames()

This function generates the html elements that contain the loaded frames
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GoToFrame(frame)

This function sets the player to frame 'frame'.
Parameters:
Name Type Description
frame int the index of the frame of interest
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GoToFrameButtonClicked()

This function is called when the user clicks the Go to frame button. It displays the frame indicated by the text field
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loadChunk(frame, duration, first_time)

This function loads a set of frames to the player.
Parameters:
Name Type Description
frame int the first frame to load
duration int the duration of the chunk to be loaded
first_time bool boolean indicating whether the function is called for the first time
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loadFile(frame, first_time, response)

This function checks that the loaded frames are correct, stores them in the video structure It prepares the polygon for scaling.
Parameters:
Name Type Description
frame int the position corresponding to the first frame in the set
first_time bool boolean indicating whether it was the first frame load of the video
response json json with the set of jpg frames being loaded
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NextFrame()

Displays the next frame in a video file according to the video rate.
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Play(buttonClicked)

This function sets the player to play. It can be called when a chunk of needed frames is loaded or when the user hits the play button.
Parameters:
Name Type Description
buttonClicked bool boolean indicating whether the user clicked the play button or the video was played because the chunks got loaded
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seekChunkToDownload(frame)

This function looks for future frames that haven't been loaded yet and loads them into the player.
Parameters:
Name Type Description
frame int the frame index from which to start seeking
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StepBackward()

This function goes to the previous frame.
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StepBeginning()

This function goes to the start of the video.
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StepEnd()

This function goes to the end of the video.
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StepForward()

This function forces to go to the next frame, regardless of frame rate.
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UpdateLoadbar(pos)

This function updates the position of the load bar.
Parameters:
Name Type Description
pos float float from 0 to 1 indicating the position of the load bar
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UpdateScrollbar(pos)

This function updates the position of the scroll bar.
Parameters:
Name Type Description
pos float float from 0 to 1 indicating the position of the scroll bar
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