fitsdec.c File Reference

FITS image decoder. More...

#include "avcodec.h"
#include "internal.h"
#include <float.h>
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat.h"
#include "libavutil/dict.h"
#include "libavutil/opt.h"
#include "fits.h"

Classes
struct	FITSContext

Macros
#define	CASE_N(a, t, rd)
#define	CASE_RGB(cas, dst, type, dref)
#define	CASE_GRAY(cas, dst, type, t, rd)

Typedefs
typedef struct FITSContext	FITSContext

Variables
AVCodec	ff_fits_decoder

Detailed Description

FITS image decoder.

Specification: https://fits.gsfc.nasa.gov/fits_standard.html Version 3.0

Support all 2d images alongwith, bzero, bscale and blank keywords. RGBA images are supported as NAXIS3 = 3 or 4 i.e. Planes in RGBA order. Also CTYPE = 'RGB ' should be present. Also to interpret data, values are linearly scaled using min-max scaling but not RGB images.

Macro Definition Documentation

CASE_GRAY

#define CASE_GRAY	(		cas,
			dst,
			type,
			t,
			rd
	)

Value:

case cas: \
        for (i = 0; i < avctx->height; i++) { \
            dst = (type *) (p->data[0] + (avctx->height-i-1)* p->linesize[0]); \
            for (j = 0; j < avctx->width; j++) { \
                t = rd; \
                if (!header.blank_found || t != header.blank) { \
                    *dst++ = ((t - header.data_min) * ((1 << (sizeof(type) * 8)) - 1)) / (header.data_max - header.data_min); \
                } else { \
                    *dst++ = fitsctx->blank_val; \
                } \
                ptr8 += abs(cas) >> 3; \
            } \
        } \
        break

CASE_N

#define CASE_N	(		a,
			t,
			rd
	)

Value:

case a: \
        for (i = 0; i < header->naxisn[1]; i++) { \
            for (j = 0; j < header->naxisn[0]; j++) { \
                t = rd; \
                if (!header->blank_found || t != header->blank) { \
                    if (t > header->data_max) \
                        header->data_max = t; \
                    if (t < header->data_min) \
                        header->data_min = t; \
                } \
                ptr8 += abs(a) >> 3; \
            } \
        } \
        break

CASE_RGB

#define CASE_RGB	(		cas,
			dst,
			type,
			dref
	)

Value:

case cas: \
        for (k = 0; k < header.naxisn[2]; k++) { \
            for (i = 0; i < avctx->height; i++) { \
                dst = (type *) (p->data[map[k]] + (avctx->height - i - 1) * p->linesize[map[k]]); \
                for (j = 0; j < avctx->width; j++) { \
                    t32 = dref(ptr8); \
                    if (!header.blank_found || t32 != header.blank) { \
                        t = t32 * header.bscale + header.bzero; \
                    } else { \
                        t = fitsctx->blank_val; \
                    } \
                    *dst++ = (type) t; \
                    ptr8 += cas >> 3; \
                } \
            } \
        } \
        break

Variable Documentation

ff_fits_decoder

AVCodec ff_fits_decoder

Initial value:

= {
    .name           = "fits",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_FITS,
    .priv_data_size = sizeof(FITSContext),
    .decode         = fits_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("Flexible Image Transport System"),
    .priv_class     = &fits_decoder_class
}