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/* |
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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 "internal.h" |
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static int fits_encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
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const AVFrame *pict, int *got_packet) |
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{ |
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AVFrame * const p = (AVFrame *)pict; |
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uint8_t *bytestream, *bytestream_start, *ptr; |
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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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✓✓✓✗
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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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✓✓ |
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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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✓✓ |
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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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✓✓ |
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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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✗✓ |
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if ((ret = ff_alloc_packet2(avctx, pkt, padded_data_size, 0)) < 0) |
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return ret; |
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bytestream_start = |
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bytestream = pkt->data; |
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✓✓ |
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for (k = 0; k < naxis3; k++) { |
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✓✓ |
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for (i = 0; i < avctx->height; i++) { |
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ptr = p->data[map[k]] + (avctx->height - i - 1) * p->linesize[map[k]]; |
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✓✓ |
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if (bitpix == 16) { |
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✓✓ |
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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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20493568 |
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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bytestream += bytes_left; |
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pkt->size = bytestream - bytestream_start; |
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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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AVCodec ff_fits_encoder = { |
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.name = "fits", |
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.long_name = NULL_IF_CONFIG_SMALL("Flexible Image Transport System"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_FITS, |
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.encode2 = fits_encode_frame, |
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.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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}; |