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'From Smalltalk/X, Version:3.1.5 on 11-apr-1997 at 6:49:46 pm' !
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ImageReader subclass:#RIFFReader
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instanceVariableNames:'chunkSize streamTypes'
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classVariableNames:'UnsupportedFormatErrorSignal'
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poolDictionaries:''
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category:'Graphics-Images-Support'
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!
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!RIFFReader class methodsFor:'documentation'!
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documentation
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"
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Helper to read RIFF files.
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"
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! !
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!RIFFReader class methodsFor:'class initialization'!
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initialize
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UnsupportedFormatErrorSignal isNil ifTrue:[
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UnsupportedFormatErrorSignal := ErrorSignal newSignalMayProceed:true.
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UnsupportedFormatErrorSignal nameClass:self message:#unsupportedFormatErrorSignal.
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].
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"
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RIFFReader initialize
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"
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"Created: 4.4.1997 / 22:35:52 / cg"
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"Modified: 5.4.1997 / 16:12:16 / cg"
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! !
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!RIFFReader class methodsFor:'testing'!
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isRIFFFile:aFileName
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"return true, if aFileName contains RIFF-encoded data"
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|data1 inStream|
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inStream := self streamReadingFile:aFileName.
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inStream isNil ifTrue:[^ false].
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inStream binary.
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data1 := String new:4.
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inStream nextBytes:4 into:data1.
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inStream close.
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^ (data1 = 'RIFF')
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"
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RIFFReader isRIFFFile:'bitmaps/magtape.xpm'
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RIFFReader isRIFFFile:'/home2/pd_stuff/movies/avi/drlair.avi'
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"
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"Created: 4.4.1997 / 22:35:52 / cg"
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"Modified: 5.4.1997 / 16:12:16 / cg"
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! !
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!RIFFReader methodsFor:'reading from stream'!
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getChunk
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"get a single chunk"
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|id s sel streamNr streamType|
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'getChunk -> ' infoPrint.
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id := ' '.
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inStream nextBytes:4 into:id startingAt:1.
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chunkSize := inStream nextLongMSB:false.
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(id at:4) == Character space ifTrue:[
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id := id copyTo:3
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].
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(id at:1) isDigit ifTrue:[
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streamNr := Number readFrom:(id copyTo:2).
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streamType := streamTypes at:(streamNr + 1).
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s := 'getChunk_' , streamType , '_' , (id copyFrom:3).
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] ifFalse:[
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s := 'getChunk_' , id.
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].
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sel := s asSymbolIfInterned.
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(sel isNil or:[(self respondsTo:sel) not]) ifTrue:[
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'[' infoPrint. s infoPrint. '] ' infoPrint.
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sel := #'getChunk_Unknown'
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].
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self perform:sel.
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'' infoPrintCR.
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"Created: 5.4.1997 / 16:29:40 / cg"
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"Modified: 11.4.1997 / 14:00:42 / cg"
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!
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getChunk_LIST
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"process a LIST chunk"
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'getChunk_LIST' infoPrint.
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inStream skip:4.
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"
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AVIReader fromFile:'/home2/pd_stuff/movies/avi/hangldm.avi'
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"Created: 4.4.1997 / 23:18:33 / cg"
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"Modified: 5.4.1997 / 16:12:16 / cg"
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!
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getChunk_RIFF
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"process a RIFF chunk"
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'getChunk_RIFF' infoPrint.
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inStream skip:4.
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"
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AVIReader fromFile:'/home2/pd_stuff/movies/avi/hangldm.avi'
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"
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"Created: 4.4.1997 / 23:18:08 / cg"
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"Modified: 5.4.1997 / 16:12:16 / cg"
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!
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getChunk_Unknown
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"ignore any other chunk"
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'getChunk_Unknown -> ' infoPrint.
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self skipChunk
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"
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AVIReader fromFile:'/home2/pd_stuff/movies/avi/hangldm.avi'
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"
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"Created: 5.4.1997 / 00:03:43 / cg"
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"Modified: 5.4.1997 / 16:12:16 / cg"
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!
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skipChunk
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"skip a chunk"
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|sz|
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'skipChunk' infoPrint.
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sz := chunkSize.
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(sz bitTest:1) ifTrue:[
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sz := sz + 1
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].
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inStream skip:sz.
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"
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AVIReader fromFile:'/home2/pd_stuff/movies/avi/hangldm.avi'
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"
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"Created: 5.4.1997 / 14:13:43 / cg"
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"Modified: 5.4.1997 / 16:12:16 / cg"
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! !
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!RIFFReader class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/RIFFReader.st,v 1.1 1997-04-14 11:59:34 cg Exp $'
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! !
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RIFFReader initialize!
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