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https://git.videolan.org/git/ffmpeg.git
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188 lines
5.5 KiB
C
188 lines
5.5 KiB
C
/*
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* FITS muxer
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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 muxer.
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*/
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#include "internal.h"
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typedef struct FITSContext {
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int first_image;
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} FITSContext;
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static int fits_write_header(AVFormatContext *s)
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{
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FITSContext *fitsctx = s->priv_data;
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fitsctx->first_image = 1;
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return 0;
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}
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/**
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* Write one header line comprising of keyword and value(int)
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* @param s AVFormat Context
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* @param keyword pointer to the char array in which keyword is stored
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* @param value the value corresponding to the keyword
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* @param lines_written to keep track of lines written so far
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* @return 0
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*/
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static int write_keyword_value(AVFormatContext *s, const char *keyword, int value, int *lines_written)
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{
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int len, ret;
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uint8_t header[80];
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len = strlen(keyword);
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memset(header, ' ', sizeof(header));
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memcpy(header, keyword, len);
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header[8] = '=';
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header[9] = ' ';
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ret = snprintf(header + 10, 70, "%d", value);
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memset(&header[ret + 10], ' ', sizeof(header) - (ret + 10));
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avio_write(s->pb, header, sizeof(header));
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*lines_written += 1;
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return 0;
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}
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static int write_image_header(AVFormatContext *s)
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{
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AVStream *st = s->streams[0];
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AVCodecParameters *encctx = st->codecpar;
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FITSContext *fitsctx = s->priv_data;
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uint8_t buffer[80];
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int bitpix, naxis, naxis3 = 1, bzero = 0, rgb = 0, lines_written = 0, lines_left;
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switch (encctx->format) {
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case AV_PIX_FMT_GRAY8:
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bitpix = 8;
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naxis = 2;
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break;
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case AV_PIX_FMT_GRAY16BE:
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bitpix = 16;
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naxis = 2;
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bzero = 32768;
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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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naxis = 3;
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rgb = 1;
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if (encctx->format == 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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naxis = 3;
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rgb = 1;
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if (encctx->format == 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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bzero = 32768;
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break;
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default:
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return AVERROR(EINVAL);
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}
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if (fitsctx->first_image) {
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memcpy(buffer, "SIMPLE = ", 10);
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memset(buffer + 10, ' ', 70);
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buffer[29] = 'T';
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avio_write(s->pb, buffer, sizeof(buffer));
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} else {
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memcpy(buffer, "XTENSION= 'IMAGE '", 20);
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memset(buffer + 20, ' ', 60);
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avio_write(s->pb, buffer, sizeof(buffer));
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}
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lines_written++;
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write_keyword_value(s, "BITPIX", bitpix, &lines_written); // no of bits per pixel
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write_keyword_value(s, "NAXIS", naxis, &lines_written); // no of dimensions of image
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write_keyword_value(s, "NAXIS1", encctx->width, &lines_written); // first dimension i.e. width
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write_keyword_value(s, "NAXIS2", encctx->height, &lines_written); // second dimension i.e. height
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if (rgb)
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write_keyword_value(s, "NAXIS3", naxis3, &lines_written); // third dimension to store RGBA planes
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if (!fitsctx->first_image) {
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write_keyword_value(s, "PCOUNT", 0, &lines_written);
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write_keyword_value(s, "GCOUNT", 1, &lines_written);
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} else {
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fitsctx->first_image = 0;
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}
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/*
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* Since FITS does not support unsigned 16 bit integers,
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* BZERO = 32768 is used to store unsigned 16 bit integers as
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* signed integers so that it can be read properly.
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*/
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if (bitpix == 16)
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write_keyword_value(s, "BZERO", bzero, &lines_written);
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if (rgb) {
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memcpy(buffer, "CTYPE3 = 'RGB '", 20);
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memset(buffer + 20, ' ', 60);
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avio_write(s->pb, buffer, sizeof(buffer));
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lines_written++;
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}
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memcpy(buffer, "END", 3);
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memset(buffer + 3, ' ', 77);
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avio_write(s->pb, buffer, sizeof(buffer));
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lines_written++;
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lines_left = ((lines_written + 35) / 36) * 36 - lines_written;
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memset(buffer, ' ', 80);
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while (lines_left > 0) {
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avio_write(s->pb, buffer, sizeof(buffer));
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lines_left--;
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}
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return 0;
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}
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static int fits_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret = write_image_header(s);
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if (ret < 0)
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return ret;
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avio_write(s->pb, pkt->data, pkt->size);
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return 0;
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}
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AVOutputFormat ff_fits_muxer = {
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.name = "fits",
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.long_name = NULL_IF_CONFIG_SMALL("Flexible Image Transport System"),
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.extensions = "fits",
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.priv_data_size = sizeof(FITSContext),
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.audio_codec = AV_CODEC_ID_NONE,
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.video_codec = AV_CODEC_ID_FITS,
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.write_header = fits_write_header,
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.write_packet = fits_write_packet,
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};
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