Sequence Diagram For Playback a DVB stream (Error on demux or dcr) for http://www.websequencediagrams.com/

SequenceDiagramForPlaybackADVBStreamErrorOnDemuxOrDcr.wsd

<div class="wsd" wsd_style="vs2010"><pre>
 
# Error on demux or dcr
title Sequence Diagram For Playback a DVB stream (Error on demux or dcr)
 
participant "Higher Layer (HTML page, JS)" as HigherLayer
participant "HTMLMediaElement" as MediaPlayer
participant "Video pipeline(Tuner, Demod, Demux, Decoder)" as VideoPipeline
 
HigherLayer->MediaPlayer: play()
 
alt networkState> NETWORK_EMPTY
 
	note right of MediaPlayer
	networkState: NETWORK_LOADING
	readyState: HAVE_ENOUGH_DATA
	end note
 
else networkState: NETWORK_EMPTY
 
        note right of HigherLayer
        Play without having called the load().
        end note
 
	note right of MediaPlayer
	networkState: NETWORK_EMPTY
	end note
 
        HigherLayer->MediaPlayer: load()
 
	note right of MediaPlayer
        The load function is described in detail in the load diagram.
	end note
 
        note right of VideoPipeline
        There was no problem executing the load.
        end note
 
	note right of MediaPlayer
	networkState: NETWORK_LOADING
	readyState: HAVE_ENOUGH_DATA
	end note
 
end
 
 
MediaPlayer->HigherLayer: play
MediaPlayer->HigherLayer: playing
MediaPlayer->HigherLayer: timeupdate (every 15 to 250 ms)
 
note right of VideoPipeline
1. There is a problem on tslock, or
2. There is a problem on dcr and cannot generate the stream.
end note
 
note right of MediaPlayer
readyState: HAVE_CURRENT_DATA
end note
 
VideoPipeline->MediaPlayer: Error returned from tslock or dcr.
 
note right of MediaPlayer
error: MEDIA_ERR_DECODE
end note
 
MediaPlayer->HigherLayer: error
 
 
note right of MediaPlayer
On Webkit the errors are included in the networkState.
networkState: DecodeError
end note
 
note right of MediaPlayer
networkState: NETWORK_IDLE
end note 
 
note right of MediaPlayer
Abort play.
end note

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