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