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 Chunk FOURCCs

Note: an underscore (_) is used to indicate the space character.

EA IFF 85 Group Identifiers
CAT_
END_	unofficial END-of-FORM identifier (see Amiga RKM Devices Ed. 3 page 376)
FORM
LIST
PROP
Text, annotations, et cetera
(c)_	EA IFF 85 Copyright
ANNO	EA IFF 85 Annotation
AUTH	EA IFF 85 Author
CHRS	EA IFF 85 Character String
FTXT	EA IFF 85 Formatted Text
FVER	Amiga OS Version String
JUNK	Ignore
NAME	EA IFF 85 Title of image, music, ...
TEXT	EA IFF 85 Unformatted ASCII Text
VERS	File Version Number
Images
ILBM	EA IFF 85 Raster Bitmap Form
DEEP	Chunky Pixel Image Files (TV Paint)
RGB8	RGB Image, Turbo Silver (Impulse)
RGBN	RGB Image, Turbo Silver (Impulse)
PBM_	256-Color Chunky Pixel
ACBM	Amiga Contiguous Bitmap (AmigaBasic)
ILBM Chunks
BMHD	ILBM Bitmap Header
CMAP	8-bit RGB Color Map (packed array of ColorRegisters)
GRAB	Hotspot Coordinates
DEST	Destination Image Info
SPRT	Sprite Identifier
BODY	Image Data
CAMG	Amiga Viewport Modes
CCRT	Graphicraft Color Cycling
CRNG	Color Cycling
CLUT	Color Lookup Table
DPI_	Dots Per Inch
DPPV	DPaint Perspective
DRNG	DPaint IV Enhanced Color Cycling
EPSF	Encapsulated Postscript
CMYK	CMYK Color Map (Soft-Logik)
CNAM	Color Naming Chunk (Soft-Logik)
PCHG	Line-by-line Palette Control Information
PRVW	Preview (thumbnail)
XBMI	Extended Bitmap Information (Soft-Logik)
CTBL	Newtek Dynamic Ham Color
DYCP	Newtek Dynamic Ham
SHAM	Sliced HAM Color
ABIT	ACBM Body
DCOL	Unofficial Direct Color
Rest...
16SV
8SVX
ANFI
ANHD	ANIM Frame
ANIM	Animation
ANSQ
ATAK
CHAN
DLTA
DPAN	Deluxe Paint Anim Chunk
DPPS
DR2D	Vector Graphics
FACE
FADE
INS1
IMRT
MHDR
PAN_
RLSE
SAMP
SEQN
SHDR
SMUS
TINY
TRAK
VHDR