IFFChunk()s represent the structure of the Interchange File Format well,
but the iformation is stored as raw data. This method tries to interpret and
translate the information into a more comprehensive format.
Arguments
- x
An
IFFChunk()object which needs to be interpreted.- ...
Currently ignored.
Value
If x is interpretable by this package an S3 class object of
IFF.ANY is returned. The content of the returned object will depend
on the type of IFFChunk() provided for x. The result can
for instance be a raster image (grDevices::as.raster()),
a list of audio tuneR::Wave()s, a character string or a named
list.
Details
Interchange File Format chunks can hold any kind of information (images, audio,
(formatted) text, etc.). This method will try to convert this information into
something useful. Information may get lost in the translation, so be careful when
converting back to an IFFChunk-class() object using
IFFChunk-method().
An error is thrown when the IFFChunk() object is currently not
interpretable by this package. See IFFChunk-method() for an overview
of currently supported IFF chunks. This list may increase while this package
matures.
See also
Other iff.operations:
IFFChunk-class,
WaveToIFF(),
as.raster.AmigaBasicShape(),
getIFFChunk(),
rasterToIFF(),
rawToIFFChunk(),
read.iff(),
write.iff()
Examples
if (FALSE) {
## load an IFF file
example.iff <- read.iff(system.file("ilbm8lores.iff", package = "AmigaFFH"))
## in this case, the file is a FORM container with a bitmap image, and a
## list with a raster object is returned when interpreted:
example.itpt <- interpretIFFChunk(example.iff)
class(example.itpt)
typeof(example.itpt)
class(example.itpt[[1]])
## Let's extraxt the bitmap header from the main chunk:
bmhd <- getIFFChunk(example.iff, c("ILBM", "BMHD"))
## When interpreted, a named list is returned with (meta-)information
## on the bitmap image:
bmhd.itpt <- interpretIFFChunk(bmhd)
class(bmhd.itpt)
typeof(bmhd.itpt)
print(bmhd.itpt)
}