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0971fcf0a0
The aim of this is twofold: a) Clang warns when setting a deprecated
field in a definition and because several of the widely set
AVCodec fields are deprecated, one gets several hundred warnings
from Clang for an ordinary build. Yet fortunately Clang (unlike GCC)
allows to disable deprecation warnings inside a definition, so
that one can create simple macros to set these fields that also suppress
deprecation warnings for Clang. This has already been done in
fdff1b9cbf for AVCodec.channel_layouts.
b) Using macros will allow to easily migrate these fields to internal ones.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
123 lines
3.9 KiB
C
123 lines
3.9 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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CODEC_PIXFMTS(AV_PIX_FMT_GBRAP16BE, AV_PIX_FMT_GBRP16BE, AV_PIX_FMT_GBRP,
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AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY8),
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};
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