Using BIF files

Question

Hello!How can i use my ".bif" file, to show the fast forward/backward list of thumbnails, if i disabled trick play?e.g.: "m.video.enableTrickPlay = false"Thank you!- Gabriel

RokuTomC · Answer

Can you elaborate on your request, please? You've created your .bif file but don't want to implement trickplay? In what way are you hoping to display your images?

zig_zag · Answer

Hi Tom!&nbsp;Sorry for&nbsp;sharing not enough information. I want to know if is possible to use from trick play, only the "bif images feature". I've created a custom player, with a custom seekbar, and other views above the video as title, time spent, etc. &nbsp;But i can't find how to decode a ".bif" file into a RowList or to create a custom TrickPlayBar node.Thanks!- Gabriel

RokuTomC · Answer

Thanks for clarifying, Gabriel. Unfortunately, you can not create a custom TrickPlayBar node. There's no way to extract the images from a .bif file

destruk · Answer

Actually there is, but it is a lot of work.

Something like this works in SDK 3.

	episode.HDBifUrl="http://server/filename.bif"
	
	m.ThumbsExist=TRUE 'Default to true
	UT=CreateObject("roUrlTransfer")
	UT.SetPort(port)
	UT.SetUrl(episode.HDBifUrl)
	
	result=UT.GetToFile("tmp:/biffile.bif") 'download bif file
	If result<>200
		m.ThumbsExist=FALSE
		Print"BIF File not found!"
		m.TimestampMultiplier=10000
		m.TotalFrameCount=INT(episode.runtime/10)+1
	End If
	
	If m.ThumbsExist=TRUE
		m.dataset=CreateObject("roByteArray")
		m.headerset=CreateObject("roAssociativeArray")
		m.dataset.ReadFile("tmp:/biffile.bif")
		m.BifVersion=-1
		If m.dataset.Count()>0
			'verify filetype
			'0-7=magic number unique file identifier=offset
			If m.dataset[0]=&h89 And m.dataset[1]=&h42 And m.dataset[2]=&h49 And m.dataset[3]=&h46 And m.dataset[4]=&h0d And m.dataset[5]=&h0a And m.dataset[6]=&h1a And m.dataset[7]=&h0a
				Print "valid BIF File Identifier"
				'8-11=bif file format version number
				If m.dataset[8]=0 And m.dataset[9]=0 And m.dataset[10]=0 And m.dataset[11]=0
					Print"Using Version 0 descrambler"
					m.BifVersion=0
				Else
					Print"unknown version format"
				End If
			Else
				Print"Invalid BIF File"
			End If
		Else
			Print"Empty File or File doesn't exist"
		End If
		
		If m.BifVersion=0
			'12-15=total number of bif file images
			m.TotalFrameCount=(m.dataset[12]+m.dataset[13]*256+m.dataset[14]*256*256+m.dataset[15]*256*256*256)
			Print "Total Frames= "+itostr(m.TotalFrameCount)
			
			'16-19=timestamp multiplier
			m.TimestampMultiplier=(m.dataset[16]+m.dataset[17]*256+m.dataset[18]*256*256+m.dataset[19]*256*256*256)
			If m.TimestampMultiplier=0 Then m.TimestampMultiplier=1000 'if 0, BIF specification treats it as 1000ms
			Print"Timestamp Multiplier= "+itostr(m.TimestampMultiplier)+" ms"
			
			'20-63=reserved for future expansion - all 00 bytes
			
			'frame index table repeats until all frames are accounted for
			'64-67=frame 0 index timestamp
			'68-71=frame 0 absolute offset of frame
			'last index frame
			'0xffffffff
			'followed by last byte of data +1	
			
			m.Offset=64 'initialize byte number counter
			m.TimeIndexTable=[]
			m.OffsetTable=[]
			For X=0 To m.TotalFrameCount-1 'run through entire index table
				T1=(m.dataset[m.Offset]+m.dataset[m.Offset+1]*256+m.dataset[m.OffSet+2]*256*256+m.dataset[m.OffSet+3]*256*256*256)
				T2=(m.dataset[m.Offset+4]+m.dataset[m.Offset+5]*256+m.dataset[m.Offset+6]*256*256+m.dataset[m.Offset+7]*256*256*256)
				m.TimeIndexTable.Push(T1)
				m.OffsetTable.Push(T2)
				m.Offset=m.Offset+8
			Next
			Print "Start of Last Frame= "+itostr(T2)
			m.EndOfFileMarker=(m.dataset[m.Offset+4]+m.dataset[m.Offset+5]*256+m.dataset[m.Offset+6]*256*256+m.dataset[m.Offset+7]*256*256*256)
			Print "Last byte of file= "+itostr(m.EndOfFileMarker)
			
			'DATA Section follows with JPG files
			m.Frames=[] 'create fromes array for image0/1/2 display - 3 frames possible at 160 width for 480 pixels
					'5 frames will not fit without making thumbnails in bif file smaller
		End If
	End If

destruk · Answer

Once you have the frames[] array then you can draw them as a bitmap, canvas, screen, or anything you like -- but as those features are going to be stripped out of the roku, I'm not sure how you would display them with scenegraph.

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