mirror of https://github.com/FFmpeg/FFmpeg.git
Paras Chadha
7 years ago
committed by
Paul B Mahol
parent
7fbc082577
commit
61e4db4bb7
10 changed files with 616 additions and 2 deletions
@ -0,0 +1,203 @@ |
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/*
|
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* FITS implementation of common functions |
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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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#include "avcodec.h" |
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#include "libavutil/dict.h" |
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#include "fits.h" |
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int avpriv_fits_header_init(FITSHeader *header, FITSHeaderState state) |
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{ |
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header->state = state; |
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header->naxis_index = 0; |
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header->blank_found = 0; |
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header->pcount = 0; |
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header->gcount = 1; |
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header->groups = 0; |
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header->rgb = 0; |
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header->image_extension = 0; |
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header->bscale = 1.0; |
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header->bzero = 0; |
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header->data_min_found = 0; |
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header->data_max_found = 0; |
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return 0; |
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} |
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static int dict_set_if_not_null(AVDictionary ***metadata, char *keyword, char *value) |
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{ |
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if (metadata) |
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av_dict_set(*metadata, keyword, value, 0); |
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return 0; |
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} |
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/**
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* Extract keyword and value from a header line (80 bytes) and store them in keyword and value strings respectively |
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* @param ptr8 pointer to the data |
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* @param keyword pointer to the char array in which keyword is to be stored |
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* @param value pointer to the char array in which value is to be stored |
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* @return 0 if calculated successfully otherwise AVERROR_INVALIDDATA |
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*/ |
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static int read_keyword_value(const uint8_t *ptr8, char *keyword, char *value) |
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{ |
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int i; |
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for (i = 0; i < 8 && ptr8[i] != ' '; i++) { |
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keyword[i] = ptr8[i]; |
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} |
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keyword[i] = '\0'; |
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if (ptr8[8] == '=') { |
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i = 10; |
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while (i < 80 && ptr8[i] == ' ') { |
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i++; |
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} |
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if (i < 80) { |
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*value++ = ptr8[i]; |
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i++; |
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if (ptr8[i-1] == '\'') { |
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for (; i < 80 && ptr8[i] != '\''; i++) { |
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*value++ = ptr8[i]; |
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} |
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*value++ = '\''; |
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} else if (ptr8[i-1] == '(') { |
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for (; i < 80 && ptr8[i] != ')'; i++) { |
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*value++ = ptr8[i]; |
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} |
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*value++ = ')'; |
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} else { |
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for (; i < 80 && ptr8[i] != ' ' && ptr8[i] != '/'; i++) { |
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*value++ = ptr8[i]; |
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} |
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} |
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} |
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} |
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*value = '\0'; |
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return 0; |
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} |
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#define CHECK_KEYWORD(key) \ |
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if (strcmp(keyword, key)) { \
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av_log(avcl, AV_LOG_ERROR, "expected %s keyword, found %s = %s\n", key, keyword, value); \
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return AVERROR_INVALIDDATA; \
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} |
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#define CHECK_VALUE(key, val) \ |
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if (sscanf(value, "%d", &header->val) != 1) { \
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av_log(avcl, AV_LOG_ERROR, "invalid value of %s keyword, %s = %s\n", key, keyword, value); \
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return AVERROR_INVALIDDATA; \
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} |
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int avpriv_fits_header_parse_line(void *avcl, FITSHeader *header, const uint8_t line[80], AVDictionary ***metadata) |
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{ |
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int dim_no, ret; |
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int64_t t; |
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double d; |
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char keyword[10], value[72], c; |
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read_keyword_value(line, keyword, value); |
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switch (header->state) { |
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case STATE_SIMPLE: |
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CHECK_KEYWORD("SIMPLE"); |
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if (value[0] == 'F') { |
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av_log(avcl, AV_LOG_WARNING, "not a standard FITS file\n"); |
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} else if (value[0] != 'T') { |
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av_log(avcl, AV_LOG_ERROR, "invalid value of SIMPLE keyword, SIMPLE = %c\n", value[0]); |
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return AVERROR_INVALIDDATA; |
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} |
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header->state = STATE_BITPIX; |
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break; |
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case STATE_XTENSION: |
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CHECK_KEYWORD("XTENSION"); |
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if (!strcmp(value, "'IMAGE '")) { |
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header->image_extension = 1; |
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} |
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header->state = STATE_BITPIX; |
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break; |
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case STATE_BITPIX: |
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CHECK_KEYWORD("BITPIX"); |
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CHECK_VALUE("BITPIX", bitpix); |
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dict_set_if_not_null(metadata, keyword, value); |
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header->state = STATE_NAXIS; |
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break; |
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case STATE_NAXIS: |
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CHECK_KEYWORD("NAXIS"); |
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CHECK_VALUE("NAXIS", naxis); |
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dict_set_if_not_null(metadata, keyword, value); |
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if (header->naxis) { |
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header->state = STATE_NAXIS_N; |
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} else { |
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header->state = STATE_REST; |
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} |
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break; |
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case STATE_NAXIS_N: |
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ret = sscanf(keyword, "NAXIS%d", &dim_no); |
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if (ret != 1 || dim_no != header->naxis_index + 1) { |
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av_log(avcl, AV_LOG_ERROR, "expected NAXIS%d keyword, found %s = %s\n", header->naxis_index + 1, keyword, value); |
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return AVERROR_INVALIDDATA; |
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} |
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if (sscanf(value, "%d", &header->naxisn[header->naxis_index]) != 1) { |
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av_log(avcl, AV_LOG_ERROR, "invalid value of NAXIS%d keyword, %s = %s\n", header->naxis_index + 1, keyword, value); |
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return AVERROR_INVALIDDATA; |
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} |
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dict_set_if_not_null(metadata, keyword, value); |
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header->naxis_index++; |
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if (header->naxis_index == header->naxis) { |
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header->state = STATE_REST; |
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} |
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break; |
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case STATE_REST: |
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if (!strcmp(keyword, "BLANK") && sscanf(value, "%"SCNd64"", &t) == 1) { |
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header->blank = t; |
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header->blank_found = 1; |
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} else if (!strcmp(keyword, "BSCALE") && sscanf(value, "%lf", &d) == 1) { |
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header->bscale = d; |
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} else if (!strcmp(keyword, "BZERO") && sscanf(value, "%lf", &d) == 1) { |
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header->bzero = d; |
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} else if (!strcmp(keyword, "CTYPE3") && !strncmp(value, "'RGB", 4)) { |
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header->rgb = 1; |
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} else if (!strcmp(keyword, "DATAMAX") && sscanf(value, "%lf", &d) == 1) { |
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header->data_max_found = 1; |
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header->data_max = d; |
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} else if (!strcmp(keyword, "DATAMIN") && sscanf(value, "%lf", &d) == 1) { |
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header->data_min_found = 1; |
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header->data_min = d; |
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} else if (!strcmp(keyword, "END")) { |
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return 1; |
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} else if (!strcmp(keyword, "GROUPS") && sscanf(value, "%c", &c) == 1) { |
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header->groups = (c == 'T'); |
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} else if (!strcmp(keyword, "GCOUNT") && sscanf(value, "%"SCNd64"", &t) == 1) { |
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header->gcount = t; |
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} else if (!strcmp(keyword, "PCOUNT") && sscanf(value, "%"SCNd64"", &t) == 1) { |
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header->pcount = t; |
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} |
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dict_set_if_not_null(metadata, keyword, value); |
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break; |
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} |
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return 0; |
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} |
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@ -0,0 +1,79 @@ |
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/*
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* FITS image format common prototypes and structures |
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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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#ifndef AVCODEC_FITS_H |
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#define AVCODEC_FITS_H |
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typedef enum FITSHeaderState { |
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STATE_SIMPLE, |
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STATE_XTENSION, |
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STATE_BITPIX, |
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STATE_NAXIS, |
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STATE_NAXIS_N, |
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STATE_PCOUNT, |
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STATE_GCOUNT, |
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STATE_REST, |
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} FITSHeaderState; |
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/**
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* Structure to store the header keywords in FITS file |
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*/ |
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typedef struct FITSHeader { |
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FITSHeaderState state; |
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unsigned naxis_index; |
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int bitpix; |
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int64_t blank; |
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int blank_found; |
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int naxis; |
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int naxisn[999]; |
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int pcount; |
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int gcount; |
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int groups; |
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int rgb; /**< 1 if file contains RGB image, 0 otherwise */ |
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int image_extension; |
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double bscale; |
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double bzero; |
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int data_min_found; |
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double data_min; |
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int data_max_found; |
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double data_max; |
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} FITSHeader; |
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/**
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* Initialize a single header line |
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* @param header pointer to the header |
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* @param state current state of parsing the header |
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* @return 0 if successful otherwise AVERROR_INVALIDDATA |
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*/ |
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int avpriv_fits_header_init(FITSHeader *header, FITSHeaderState state); |
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/**
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* Parse a single header line |
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* @param avcl used in av_log |
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* @param header pointer to the header |
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* @param line one header line |
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* @param metadata used to store metadata while decoding |
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* @return 0 if successful otherwise AVERROR_INVALIDDATA |
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*/ |
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int avpriv_fits_header_parse_line(void *avcl, FITSHeader *header, const uint8_t line[80], AVDictionary ***metadata); |
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#endif /* AVCODEC_FITS_H */ |
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@ -0,0 +1,318 @@ |
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/*
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* FITS image decoder |
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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 decoder |
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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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* Support all 2d images alongwith, bzero, bscale and blank keywords. |
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* RGBA images are supported as NAXIS3 = 3 or 4 i.e. Planes in RGBA order. Also CTYPE = 'RGB ' should be present. |
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* Also to interpret data, values are linearly scaled using min-max scaling but not RGB images. |
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*/ |
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#include "avcodec.h" |
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#include "internal.h" |
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#include <float.h> |
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/intfloat.h" |
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#include "libavutil/dict.h" |
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#include "libavutil/opt.h" |
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#include "fits.h" |
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typedef struct FITSContext { |
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const AVClass *class; |
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int blank_val; |
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} FITSContext; |
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/**
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* Calculate the data_min and data_max values from the data. |
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* This is called if the values are not present in the header. |
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* @param ptr8 pointer to the data |
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* @param header pointer to the header |
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* @param end pointer to end of packet |
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* @return 0 if calculated successfully otherwise AVERROR_INVALIDDATA |
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*/ |
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static int fill_data_min_max(const uint8_t *ptr8, FITSHeader *header, const uint8_t *end) |
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{ |
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uint8_t t8; |
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int16_t t16; |
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int32_t t32; |
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int64_t t64; |
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float tflt; |
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double tdbl; |
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int i, j; |
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header->data_min = DBL_MAX; |
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header->data_max = DBL_MIN; |
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switch (header->bitpix) { |
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#define CASE_N(a, t, rd) \ |
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case a: \
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for (i = 0; i < header->naxisn[1]; i++) { \
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for (j = 0; j < header->naxisn[0]; j++) { \
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t = rd; \
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if (!header->blank_found || t != header->blank) { \
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if (t > header->data_max) \
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header->data_max = t; \
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if (t < header->data_min) \
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header->data_min = t; \
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} \
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ptr8 += abs(a) >> 3; \
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} \
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} \
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break |
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CASE_N(-64, tdbl, av_int2double(AV_RB64(ptr8))); |
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CASE_N(-32, tflt, av_int2float(AV_RB32(ptr8))); |
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CASE_N(8, t8, ptr8[0]); |
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CASE_N(16, t16, AV_RB16(ptr8)); |
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CASE_N(32, t32, AV_RB32(ptr8)); |
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CASE_N(64, t64, AV_RB64(ptr8)); |
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default: |
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return AVERROR_INVALIDDATA; |
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} |
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return 0; |
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} |
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/**
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* Read the fits header and store the values in FITSHeader pointed by header |
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* @param avctx AVCodec context |
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* @param ptr pointer to pointer to the data |
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* @param header pointer to the FITSHeader |
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* @param end pointer to end of packet |
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* @param metadata pointer to pointer to AVDictionary to store metadata |
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* @return 0 if calculated successfully otherwise AVERROR_INVALIDDATA |
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*/ |
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static int fits_read_header(AVCodecContext *avctx, const uint8_t **ptr, FITSHeader *header, |
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const uint8_t *end, AVDictionary **metadata) |
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{ |
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const uint8_t *ptr8 = *ptr; |
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int lines_read, bytes_left, i, ret; |
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size_t size; |
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lines_read = 1; // to account for first header line, SIMPLE or XTENSION which is not included in packet...
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avpriv_fits_header_init(header, STATE_BITPIX); |
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do { |
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if (end - ptr8 < 80) |
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return AVERROR_INVALIDDATA; |
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ret = avpriv_fits_header_parse_line(avctx, header, ptr8, &metadata); |
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ptr8 += 80; |
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lines_read++; |
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} while (!ret); |
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if (ret < 0) |
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return ret; |
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bytes_left = (((lines_read + 35) / 36) * 36 - lines_read) * 80; |
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if (end - ptr8 < bytes_left) |
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return AVERROR_INVALIDDATA; |
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ptr8 += bytes_left; |
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if (header->rgb && (header->naxis != 3 || (header->naxisn[2] != 3 && header->naxisn[2] != 4))) { |
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av_log(avctx, AV_LOG_ERROR, "File contains RGB image but NAXIS = %d and NAXIS3 = %d\n", header->naxis, header->naxisn[2]); |
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return AVERROR_INVALIDDATA; |
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} |
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|
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if (!header->rgb && header->naxis != 2) { |
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av_log(avctx, AV_LOG_ERROR, "unsupported number of dimensions, NAXIS = %d\n", header->naxis); |
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return AVERROR_INVALIDDATA; |
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} |
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|
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if (header->blank_found && (header->bitpix == -32 || header->bitpix == -64)) { |
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av_log(avctx, AV_LOG_WARNING, "BLANK keyword found but BITPIX = %d\n. Ignoring BLANK", header->bitpix); |
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header->blank_found = 0; |
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} |
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|
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size = abs(header->bitpix) >> 3; |
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for (i = 0; i < header->naxis; i++) { |
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if (header->naxisn[i] > SIZE_MAX / size) { |
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av_log(avctx, AV_LOG_ERROR, "unsupported size of FITS image"); |
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return AVERROR_INVALIDDATA; |
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} |
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size *= header->naxisn[i]; |
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} |
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|
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if (end - ptr8 < size) |
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return AVERROR_INVALIDDATA; |
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*ptr = ptr8; |
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|
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if (!header->rgb && (!header->data_min_found || !header->data_max_found)) { |
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ret = fill_data_min_max(ptr8, header, end); |
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if (ret < 0) { |
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av_log(avctx, AV_LOG_ERROR, "invalid BITPIX, %d\n", header->bitpix); |
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return ret; |
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} |
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} else { |
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/*
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* instead of applying bscale and bzero to every element, |
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* we can do inverse transformation on data_min and data_max |
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*/ |
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header->data_min = (header->data_min - header->bzero) / header->bscale; |
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header->data_max = (header->data_max - header->bzero) / header->bscale; |
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} |
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|
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return 0; |
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} |
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|
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static int fits_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) |
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{ |
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AVFrame *p=data; |
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const uint8_t *ptr8 = avpkt->data, *end; |
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uint8_t t8; |
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int16_t t16; |
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int32_t t32; |
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int64_t t64; |
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float tflt; |
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double tdbl; |
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int ret, i, j, k; |
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const int map[] = {2, 0, 1, 3}; // mapping from GBRA -> RGBA as RGBA is to be stored in FITS file..
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uint8_t *dst8; |
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uint16_t *dst16; |
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uint64_t t; |
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FITSHeader header; |
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FITSContext * fitsctx = avctx->priv_data; |
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|
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end = ptr8 + avpkt->size; |
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p->metadata = NULL; |
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ret = fits_read_header(avctx, &ptr8, &header, end, &p->metadata); |
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if (ret < 0) |
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return ret; |
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|
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if (header.rgb) { |
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if (header.bitpix == 8) { |
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if (header.naxisn[2] == 3) { |
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avctx->pix_fmt = AV_PIX_FMT_GBRP; |
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} else { |
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avctx->pix_fmt = AV_PIX_FMT_GBRAP; |
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} |
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} else if (header.bitpix == 16) { |
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if (header.naxisn[2] == 3) { |
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avctx->pix_fmt = AV_PIX_FMT_GBRP16; |
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} else { |
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avctx->pix_fmt = AV_PIX_FMT_GBRAP16; |
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} |
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} else { |
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av_log(avctx, AV_LOG_ERROR, "unsupported BITPIX = %d\n", header.bitpix); |
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return AVERROR_INVALIDDATA; |
||||
} |
||||
} else { |
||||
if (header.bitpix == 8) { |
||||
avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
||||
} else { |
||||
avctx->pix_fmt = AV_PIX_FMT_GRAY16; |
||||
} |
||||
} |
||||
|
||||
if ((ret = ff_set_dimensions(avctx, header.naxisn[0], header.naxisn[1])) < 0) |
||||
return ret; |
||||
|
||||
if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
||||
return ret; |
||||
|
||||
/*
|
||||
* FITS stores images with bottom row first. Therefore we have |
||||
* to fill the image from bottom to top. |
||||
*/ |
||||
if (header.rgb) { |
||||
switch(header.bitpix) { |
||||
#define CASE_RGB(cas, dst, type, dref) \ |
||||
case cas: \
|
||||
for (k = 0; k < header.naxisn[2]; k++) { \
|
||||
for (i = 0; i < avctx->height; i++) { \
|
||||
dst = (type *) (p->data[map[k]] + (avctx->height - i - 1) * p->linesize[map[k]]); \
|
||||
for (j = 0; j < avctx->width; j++) { \
|
||||
t32 = dref(ptr8); \
|
||||
if (!header.blank_found || t32 != header.blank) { \
|
||||
t = t32 * header.bscale + header.bzero; \
|
||||
} else { \
|
||||
t = fitsctx->blank_val; \
|
||||
} \
|
||||
*dst++ = (type) t; \
|
||||
ptr8 += cas >> 3; \
|
||||
} \
|
||||
} \
|
||||
} \
|
||||
break |
||||
|
||||
CASE_RGB(8, dst8, uint8_t, *); |
||||
CASE_RGB(16, dst16, uint16_t, AV_RB16); |
||||
} |
||||
} else { |
||||
switch (header.bitpix) { |
||||
#define CASE_GRAY(cas, dst, type, t, rd) \ |
||||
case cas: \
|
||||
for (i = 0; i < avctx->height; i++) { \
|
||||
dst = (type *) (p->data[0] + (avctx->height-i-1)* p->linesize[0]); \
|
||||
for (j = 0; j < avctx->width; j++) { \
|
||||
t = rd; \
|
||||
if (!header.blank_found || t != header.blank) { \
|
||||
t = ((t - header.data_min) * ((1 << (sizeof(type) * 8)) - 1)) / (header.data_max - header.data_min); \
|
||||
} else { \
|
||||
t = fitsctx->blank_val; \
|
||||
} \
|
||||
*dst++ = (type) t; \
|
||||
ptr8 += abs(cas) >> 3; \
|
||||
} \
|
||||
} \
|
||||
break |
||||
|
||||
CASE_GRAY(-64, dst16, uint16_t, tdbl, av_int2double(AV_RB64(ptr8))); |
||||
CASE_GRAY(-32, dst16, uint16_t, tflt, av_int2float(AV_RB32(ptr8))); |
||||
CASE_GRAY(8, dst8, uint8_t, t8, ptr8[0]); |
||||
CASE_GRAY(16, dst16, uint16_t, t16, AV_RB16(ptr8)); |
||||
CASE_GRAY(32, dst16, uint16_t, t32, AV_RB32(ptr8)); |
||||
CASE_GRAY(64, dst16, uint16_t, t64, AV_RB64(ptr8)); |
||||
default: |
||||
av_log(avctx, AV_LOG_ERROR, "invalid BITPIX, %d\n", header.bitpix); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
} |
||||
|
||||
p->key_frame = 1; |
||||
p->pict_type = AV_PICTURE_TYPE_I; |
||||
|
||||
*got_frame = 1; |
||||
|
||||
return avpkt->size; |
||||
} |
||||
|
||||
static const AVOption fits_options[] = { |
||||
{ "blank_value", "value that is used to replace BLANK pixels in data array", offsetof(FITSContext, blank_val), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 65535, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM}, |
||||
{ NULL }, |
||||
}; |
||||
|
||||
static const AVClass fits_decoder_class = { |
||||
.class_name = "FITS decoder", |
||||
.item_name = av_default_item_name, |
||||
.option = fits_options, |
||||
.version = LIBAVUTIL_VERSION_INT, |
||||
}; |
||||
|
||||
AVCodec ff_fits_decoder = { |
||||
.name = "fits", |
||||
.type = AVMEDIA_TYPE_VIDEO, |
||||
.id = AV_CODEC_ID_FITS, |
||||
.priv_data_size = sizeof(FITSContext), |
||||
.decode = fits_decode_frame, |
||||
.capabilities = AV_CODEC_CAP_DR1, |
||||
.long_name = NULL_IF_CONFIG_SMALL("Flexible Image Transport System"), |
||||
.priv_class = &fits_decoder_class |
||||
}; |
||||
Loading…
Reference in new issue