IFF

• Extensions: 8svx, 16sv, ilbm, anim
• MIME Types:
  • 8svx: audio/8svx, audio/x-8svx
  • 16sv: audio/16sv, audio/x-16sv
  • ilbm: image/ilbm, image/x-ilbm
  • anim: video/anim, video/x-anim
• Specification:
  • Original Electronic Arts specification january 14 1985.

IFF (Interchange File Format) is a format developed by electronic arts in the 80's. It is the predominant format on the Amiga computer. It is a chunked format. It can be used to store any type of data, but it is predominantly used to store images, animations and audio.

IFF chunks are always padded to an even number of bytes.

Implementations

• xine has a demuxer/decoder for iff. Manfred Tremmel the author of the xine code has agreed to relicence his xine code as LGPL to allow easier use in ffmpeg. Thanks Manfred.
• Werner Randelshofer the author of multishow has also granted permission for his iff code to be relicenced as LGPL. Thanks Werner.
• Xanim also contains code to support iff, it may contain some formats not available in xine.
• libiffanim supports lots of animation formats http://www-user.tu-chemnitz.de/~womar/projects/iffanim/
• Virtualdub contains a demuxer/decoder also, look in the file InputFileANIM.cpp

ILBM FOURCC

Images are stored in planes. So, to get a pixels color value you need to combine the bits from each frame to create a color register index.

/* ---------- BitMapHeader ---------------------------------------------*/
/*  Required Bitmap header (BMHD) structure describes an ILBM           */
typedef struct {
 uint16_t             w;                    /* raster width in pixels  */
 uint16_t             h;                    /* raster height in pixels */
 int16_t              x;                    /* x offset in pixels  */
 int16_t              y;                    /* y offset in pixels */
 uint8_t              nplanes;              /* # source bitplanes      */
 uint8_t              masking;              /* masking technique       */
 uint8_t              compression;          /* compression algoithm    */
 uint8_t              pad1;                 /* UNUSED.  For consistency, put 0 here. */
 uint16_t             transparentColor;     /* transparent "color number" */
 uint8_t              xaspect;              /* aspect ratio, a rational number x/y */
 uint8_t              yaspect;              /* aspect ratio, a rational number x/y */
 int16_t              pagewidth;            /* source "page" size in pixels */
 int16_t              pageheight;           /* source "page" size in pixels */
} BitMapHeader;

Table Of Forms/Chunks FOURCC's

Note: FOURCC's of less than four characters are padded with spaces.

Group Identifiers
FOURCC	Standard	Description
CAT	EA85
END	unofficial	END-of-FORM identifier (see Amiga RKM Devices Ed. 3 page 376)
FORM	EA85
LIST	EA85
PROP	EA85
Text, annotations, et cetera
FOURCC	Standard	Description
(c)	EA85	Copyright
ANNO	EA85	Annotation
AUTH	EA85	Author
CHRS	EA85	Character String
CSET		Character Set
FTXT	EA85	Formatted Text
FVER		Amiga OS Version String
HLID	private	HotLink IDentification (Soft-Logik)
JUNK		Ignore
NAME	EA85	Title of image, music, ...
TEXT	EA85	Unformatted ASCII Text
VERS		File Version Number
Image Forms
FOURCC	Standard	Description
ACBM		Amiga Contiguous Bitmap (AmigaBasic)
CHBM	private	Chunky Bitmap
DEEP		Chunky Pixel Image Files (TV Paint)
ILBM	EA85	Raster Bitmap Form
PBM		256-Color Chunky Pixel
RGB8		RGB Image, Turbo Silver (Impulse)
RGBN		RGB Image, Turbo Silver (Impulse)
ILBM Chunks
FOURCC	Standard	Description
3DCM	reserved	by Haitex
3DPA	reserved	by Haitex
ABIT		ACBM Body
ASDG	private	ASDG Application
BHBA	private	Photon Paint (brushes)
BHCP	private	Photon Paint (screens)
BHSM	private	Photon Paint
BMHD	EA85	ILBM Bitmap Header
BODY	EA85	Image Data
CAMG		Amiga Viewport Modes
CCRT		Graphicraft Color Cycling
CLUT		Color Lookup Table
CMAP	EA85	8-bit RGB Color Map (packed array of ColorRegisters)
CMYK		CMYK Color Map (Soft-Logik)
CNAM		Color Naming Chunk, providex names for CMAP and/or CMYK (Soft-Logik)
CRNG		Color Cycling
CTBL.DYCP		Newtek Dynamic Ham Color
DCOL	unofficial	Direct Color
DCTV	reserved
DEST		Destination Image Info
DGVW	private	Newtek DigiView
DLTA		Image Data
DPI		Dots Per Inch
DPPV		DPaint Perspective (EA)
DRNG		DPaint IV Enhanced Color Cycling (EA)
EPSF		Encapsulated Postscript
GRAB		Hotspot Coordinates
PCHG		Line-by-line Palette Control Information
PRVW	proposal	Preview (thumbnail)
SHAM		Sliced HAM Color
SPRT		Sprite Identifier
TMAP	reserved	Transparency Map
VTAG	proposal	Viewmode Tags
XBMI		Extended Bitmap Information (Soft-Logik)
XSSL		Identifier for 3D X-Specs Image (Haitex)
Audio and Music
FOURCC	Standard	Description
16SV
8SVX	EA85	8-bit Sound Sample
8SVX.CHAN.PAN		Stereo chunks
8SVX.SEQN.FADE		Looping chunks
AHIM	private	AHI Modes
AHIM.AUDN	private	Audio Driver Name
AHIM.AUDD	private	Audio Driver Data
AHIM.AUDM	private	Audio Mode
AIFF		Audio 1-32 bit Samples
BANK	private	Soundquest Editor/Librarian MIDI Sysex Dump
CELP	proposal	Compressed ZyXEL Voice Data
CMUS	proposal	Common Musical Score
Fonts
FOURCC	Standard	Description
CPFM	private	Cloanto Personal Fontmaker
Animation
FOURCC	Standard	Description
AHAM	unregistered
ANBM		Animated Bitmap (Framer, Deluxe Video)
ANIM		Cel Animation
ANIM.brush		Brushes
ANIM.op6		Stereo, 3D Animation
ANIM.op7	private
ANIM.op8
Rest...
FOURCC	Standard	Description
ANFI
ANHD		ANIM Frame
ANSQ
ARC	proposal	Archive Format
ARES	private
ATXT	reserved
ATAK
AVCF	private	AmigaVision Flow format
BBSD	private	BBS Database, F. Patnaude, Jr., Phalanx Software
C100	private	Cloanto Italiaformat
CLIP	private	CAT CLIP, holds various clipboard formats
DPAN		Deluxe Paint Anim Chunk
DPPS
DR2D		Vector Graphics
FACE
FRED	private	ASDG Global Chunk
INFO	proposal	Contains data usually found in .info file
INS1
IMRT
MHDR
RLSE
SAMP
SHDR
SMUS
TINY
TRAK
VHDR