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

DiagramForLoadingAVideoFileFromDiskNoErrors

# No errors on demux and dcr
title Sequence Diagram For Loading 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
 
HigherLayer->MediaPlayer: load()
 
note right of MediaPlayer
networkState: NETWORK_EMPTY
readyState: HAVE_NOTHING
end note
 
 
note right of MediaPlayer
networkState: NETWORK_NO_SOURCE
end note
 
MediaPlayer->VideoPipeline: Can you read the media data from the disk?
 
note right of MediaPlayer
networkState: NETWORK_LOADING
end note
 
MediaPlayer->HigherLayer: loadstart
 
MediaPlayer->HigherLayer: progress
 
note right of VideoPipeline
1. Media Player reads successfuly the file from the hard disk.
2. The decoder decodes the first data in order to get the metadata \nand the first video frames.
end note
 
VideoPipeline->MediaPlayer: Ok the stream is ready. The metadata is returned. A couple of frames are returned.
 
note right of MediaPlayer
readyState: HAVE_METADATA
end note
 
MediaPlayer->HigherLayer: loadedmetadata
 
note right of MediaPlayer
networkState: NETWORK_IDLE
end note
 
MediaPlayer->HigherLayer: suspend 
 
note right of MediaPlayer
readyState: HAVE_CURRENT_DATA
end note
 
 
MediaPlayer->HigherLayer: loadeddata
 
MediaPlayer->VideoPipeline: Now that the stream is decoded and have the metatdata, can you send me emough data for playback?
 
note right of MediaPlayer
networkState: NETWORK_LOADING
end note
 
MediaPlayer->HigherLayer: progress
 
note right of VideoPipeline
1. Media Player reads more data from the disk 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
 
 
HigherLayer->MediaPlayer: play()