FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/fitsenc.c
Date: 2025-07-15 08:12:33
Exec Total Coverage
Lines: 42 46 91.3%
Functions: 1 1 100.0%
Branches: 18 20 90.0%
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1 /*
2 * FITS image encoder
3 * Copyright (c) 2017 Paras Chadha
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * FITS image encoder
25 *
26 * Specification: https://fits.gsfc.nasa.gov/fits_standard.html Version 3.0
27 *
28 * RGBA images are encoded as planes in RGBA order. So, NAXIS3 is 3 or 4 for them.
29 * Also CTYPE3 = 'RGB ' is added to the header to distinguish them from 3d images.
30 */
31
32 #include "libavutil/intreadwrite.h"
33 #include "avcodec.h"
34 #include "bytestream.h"
35 #include "codec_internal.h"
36 #include "encode.h"
37
38 189 static int fits_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
39 const AVFrame *p, int *got_packet)
40 {
41 uint8_t *bytestream;
42 189 const uint16_t flip = (1 << 15);
43 189 uint64_t data_size = 0, padded_data_size = 0;
44 189 int ret, bitpix, naxis3 = 1, i, j, k, bytes_left;
45 189 int map[] = {2, 0, 1, 3}; // mapping from GBRA -> RGBA as RGBA is to be stored in FITS file..
46
47
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 189 switch (avctx->pix_fmt) {
48 61 case AV_PIX_FMT_GRAY8:
49 case AV_PIX_FMT_GRAY16BE:
50 61 map[0] = 0; // grayscale images should be directly mapped
51
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 61 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
52 31 bitpix = 8;
53 } else {
54 30 bitpix = 16;
55 }
56 61 break;
57 66 case AV_PIX_FMT_GBRP:
58 case AV_PIX_FMT_GBRAP:
59 66 bitpix = 8;
60
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 66 if (avctx->pix_fmt == AV_PIX_FMT_GBRP) {
61 31 naxis3 = 3;
62 } else {
63 35 naxis3 = 4;
64 }
65 66 break;
66 62 case AV_PIX_FMT_GBRP16BE:
67 case AV_PIX_FMT_GBRAP16BE:
68 62 bitpix = 16;
69
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 62 if (avctx->pix_fmt == AV_PIX_FMT_GBRP16BE) {
70 31 naxis3 = 3;
71 } else {
72 31 naxis3 = 4;
73 }
74 62 break;
75 ✗ default:
76 ✗ av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
77 ✗ return AVERROR(EINVAL);
78 }
79
80 189 data_size = (bitpix >> 3) * avctx->height * avctx->width * naxis3;
81 189 padded_data_size = ((data_size + 2879) / 2880 ) * 2880;
82
83
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 189 if ((ret = ff_get_encode_buffer(avctx, pkt, padded_data_size, 0)) < 0)
84 ✗ return ret;
85
86 189 bytestream = pkt->data;
87
88
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 700 for (k = 0; k < naxis3; k++) {
89
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 120719 for (i = 0; i < avctx->height; i++) {
90 120208 const uint8_t *ptr = p->data[map[k]] + (avctx->height - i - 1) * p->linesize[map[k]];
91
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 120208 if (bitpix == 16) {
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 20553504 for (j = 0; j < avctx->width; j++) {
93 // subtracting bzero is equivalent to first bit flip
94 20493568 bytestream_put_be16(&bytestream, AV_RB16(ptr) ^ flip);
95 20493568 ptr += 2;
96 }
97 } else {
98 60272 memcpy(bytestream, ptr, avctx->width);
99 60272 bytestream += avctx->width;
100 }
101 }
102 }
103
104 189 bytes_left = padded_data_size - data_size;
105 189 memset(bytestream, 0, bytes_left);
106
107 189 pkt->flags |= AV_PKT_FLAG_KEY;
108 189 *got_packet = 1;
109
110 189 return 0;
111 }
112
113 const FFCodec ff_fits_encoder = {
114 .p.name = "fits",
115 CODEC_LONG_NAME("Flexible Image Transport System"),
116 .p.type = AVMEDIA_TYPE_VIDEO,
117 .p.id = AV_CODEC_ID_FITS,
118 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
119 FF_CODEC_ENCODE_CB(fits_encode_frame),
120 CODEC_PIXFMTS(AV_PIX_FMT_GBRAP16BE, AV_PIX_FMT_GBRP16BE, AV_PIX_FMT_GBRP,
121 AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY8),
122 };
123