mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
127 lines
4.2 KiB
C
127 lines
4.2 KiB
C
/*
|
|
* FITS image encoder
|
|
* Copyright (c) 2017 Paras Chadha
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* FITS image encoder
|
|
*
|
|
* Specification: https://fits.gsfc.nasa.gov/fits_standard.html Version 3.0
|
|
*
|
|
* RGBA images are encoded as planes in RGBA order. So, NAXIS3 is 3 or 4 for them.
|
|
* Also CTYPE3 = 'RGB ' is added to the header to distinguish them from 3d images.
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "codec_internal.h"
|
|
#include "encode.h"
|
|
|
|
static int fits_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
|
|
const AVFrame *p, int *got_packet)
|
|
{
|
|
uint8_t *bytestream;
|
|
const uint16_t flip = (1 << 15);
|
|
uint64_t data_size = 0, padded_data_size = 0;
|
|
int ret, bitpix, naxis3 = 1, i, j, k, bytes_left;
|
|
int map[] = {2, 0, 1, 3}; // mapping from GBRA -> RGBA as RGBA is to be stored in FITS file..
|
|
|
|
switch (avctx->pix_fmt) {
|
|
case AV_PIX_FMT_GRAY8:
|
|
case AV_PIX_FMT_GRAY16BE:
|
|
map[0] = 0; // grayscale images should be directly mapped
|
|
if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
|
|
bitpix = 8;
|
|
} else {
|
|
bitpix = 16;
|
|
}
|
|
break;
|
|
case AV_PIX_FMT_GBRP:
|
|
case AV_PIX_FMT_GBRAP:
|
|
bitpix = 8;
|
|
if (avctx->pix_fmt == AV_PIX_FMT_GBRP) {
|
|
naxis3 = 3;
|
|
} else {
|
|
naxis3 = 4;
|
|
}
|
|
break;
|
|
case AV_PIX_FMT_GBRP16BE:
|
|
case AV_PIX_FMT_GBRAP16BE:
|
|
bitpix = 16;
|
|
if (avctx->pix_fmt == AV_PIX_FMT_GBRP16BE) {
|
|
naxis3 = 3;
|
|
} else {
|
|
naxis3 = 4;
|
|
}
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
data_size = (bitpix >> 3) * avctx->height * avctx->width * naxis3;
|
|
padded_data_size = ((data_size + 2879) / 2880 ) * 2880;
|
|
|
|
if ((ret = ff_get_encode_buffer(avctx, pkt, padded_data_size, 0)) < 0)
|
|
return ret;
|
|
|
|
bytestream = pkt->data;
|
|
|
|
for (k = 0; k < naxis3; k++) {
|
|
for (i = 0; i < avctx->height; i++) {
|
|
const uint8_t *ptr = p->data[map[k]] + (avctx->height - i - 1) * p->linesize[map[k]];
|
|
if (bitpix == 16) {
|
|
for (j = 0; j < avctx->width; j++) {
|
|
// subtracting bzero is equivalent to first bit flip
|
|
bytestream_put_be16(&bytestream, AV_RB16(ptr) ^ flip);
|
|
ptr += 2;
|
|
}
|
|
} else {
|
|
memcpy(bytestream, ptr, avctx->width);
|
|
bytestream += avctx->width;
|
|
}
|
|
}
|
|
}
|
|
|
|
bytes_left = padded_data_size - data_size;
|
|
memset(bytestream, 0, bytes_left);
|
|
|
|
*got_packet = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const FFCodec ff_fits_encoder = {
|
|
.p.name = "fits",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("Flexible Image Transport System"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_FITS,
|
|
.p.capabilities = AV_CODEC_CAP_DR1,
|
|
FF_CODEC_ENCODE_CB(fits_encode_frame),
|
|
.p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_GBRAP16BE,
|
|
AV_PIX_FMT_GBRP16BE,
|
|
AV_PIX_FMT_GBRP,
|
|
AV_PIX_FMT_GBRAP,
|
|
AV_PIX_FMT_GRAY16BE,
|
|
AV_PIX_FMT_GRAY8,
|
|
AV_PIX_FMT_NONE },
|
|
};
|