| Line | Branch | Exec | Source |
|---|---|---|---|
| 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) { |
| 92 |
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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 |