Sequence Diagram For Playback a Video File From Disk (No errors) for http://www.websequencediagrams.com/

SequenceDiagramForPlaybackAVideoFileFromDiskNoErrors.wsd

# No errors
title Sequence Diagram For Playback a Video File From Disk (No errors)
 
participant "Higher Layer (HTML page, JS)" as HigherLayer
participant "Media Player (Webkit {HTMLMediaElement, MediaPlayer, MediaPlayerPrivate}, Irisplayer)" as MediaPlayer
participant "Video pipeline(Local Disk, Demux, Decoder)" as VideoPipeline
 
note right of MediaPlayer
networkState: NETWORK_IDLE
readyState: HAVE_ENOUGH_DATA
end note
 
HigherLayer->MediaPlayer: play()
 
MediaPlayer->HigherLayer: play
MediaPlayer->HigherLayer: playing
 
MediaPlayer->VideoPipeline: Check if there are enough data for playback.
 
alt There are not enough data for playback
 
    note right of MediaPlayer
    networkState: NETWORK_LOADING
    end note
 
    MediaPlayer->HigherLayer: progress
 
    note right of MediaPlayer
    readyState <= HAVE_CURRENT_DATA
    end note
 
    MediaPlayer->HigherLayer: waiting
 
    note right of VideoPipeline
    1. Media Player reads enough data until the buffer is full.
    2. Decoder decodes the data to video frames.
    end note
 
    VideoPipeline->MediaPlayer: Enough data returned for playback.
 
    note right of MediaPlayer
    networkState: NETWORK_IDLE
    end note
 
    MediaPlayer->HigherLayer: suspend
 
    note right of MediaPlayer
    readyState: HAVE_ENOUGH_DATA
    end note
 
    MediaPlayer->HigherLayer: canplay
    MediaPlayer->HigherLayer: canplaythrough
    MediaPlayer->HigherLayer: playing
 
else There are enough data to playback
 
    note right of MediaPlayer
    No need to perform any particular action.
    end note
 
    VideoPipeline->MediaPlayer: No need to return any data.
    
end