TIFFcodec — LibTIFF 4.6.0 documentation

# TIFFcodec

## Synopsis

    #include <tiffio.h>

const TIFFCodec *TIFFFindCODEC(uint16_t scheme)

TIFFCodec *TIFFRegisterCODEC(uint16_t scheme, const char *method, TIFFInitMethod init)

void TIFFUnRegisterCODEC(TIFFCodec *codec)

int TIFFIsCODECConfigured(uint16_t scheme)

TIFFCodec *TIFFGetConfiguredCODECs(uint16_t scheme)

int TIFFSetCompressionScheme(TIFF *tif, int scheme)

## Description

libtiff supports a variety of compression schemes implemented by software codecs. Each codec adheres to a modular interface that provides for the decoding and encoding of image data; as well as some other methods for initialization, setup, cleanup, and the control of default strip and tile sizes. Codecs are identified by the associated value of the TIFF `Compression` tag; e.g. 5 for LZW compression.

`TIFFFindCODEC()` ??????

`TIFFUnRegisterCODEC()` ?????

The `TIFFRegisterCODEC()` routine can be used to augment or override the set of codecs available to an application. If the specified scheme already has a registered codec then it is overridden and any images with data encoded with this compression scheme will be decoded using the supplied codec.

`TIFFIsCODECConfigured()` returns 1 if the codec is configured and working. Otherwise 0 will be returned.

`TIFFGetConfiguredCODECs()` gets list of configured codecs, both built-in and registered by user. Function returns array of `TIFFCodec` records (the last record should be NULL) or NULL if function failed. Caller is responsible to free this structure.

`TIFFSetCompressionScheme()` ????

## Diagnostics

`No space to register compression scheme %s`:

> `TIFFRegisterCODEC()` was unable to allocate memory for the data structures needed to register a codec.

`Cannot remove compression scheme %s; not registered`:

> `TIFFUnRegisterCODEC()` did not locate the specified codec in the table of registered compression schemes.

## See also

libtiff (3tiff),