| 1 | /* |
| 2 | * PNM image format |
| 3 | * Copyright (c) 2002, 2003 Fabrice Bellard |
| 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 | #include <stdlib.h> |
| 23 | #include <string.h> |
| 24 | |
| 25 | #include "libavutil/imgutils.h" |
| 26 | #include "avcodec.h" |
| 27 | #include "pnm.h" |
| 28 | |
| 29 | static inline int pnm_space(int c) |
| 30 | { |
| 31 | return c == ' ' || c == '\n' || c == '\r' || c == '\t'; |
| 32 | } |
| 33 | |
| 34 | static void pnm_get(PNMContext *sc, char *str, int buf_size) |
| 35 | { |
| 36 | char *s; |
| 37 | int c; |
| 38 | |
| 39 | /* skip spaces and comments */ |
| 40 | while (sc->bytestream < sc->bytestream_end) { |
| 41 | c = *sc->bytestream++; |
| 42 | if (c == '#') { |
| 43 | while (c != '\n' && sc->bytestream < sc->bytestream_end) { |
| 44 | c = *sc->bytestream++; |
| 45 | } |
| 46 | } else if (!pnm_space(c)) { |
| 47 | break; |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | s = str; |
| 52 | while (sc->bytestream < sc->bytestream_end && !pnm_space(c)) { |
| 53 | if ((s - str) < buf_size - 1) |
| 54 | *s++ = c; |
| 55 | c = *sc->bytestream++; |
| 56 | } |
| 57 | *s = '\0'; |
| 58 | } |
| 59 | |
| 60 | int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s) |
| 61 | { |
| 62 | char buf1[32], tuple_type[32]; |
| 63 | int h, w, depth, maxval; |
| 64 | |
| 65 | pnm_get(s, buf1, sizeof(buf1)); |
| 66 | if(buf1[0] != 'P') |
| 67 | return AVERROR_INVALIDDATA; |
| 68 | s->type= buf1[1]-'0'; |
| 69 | |
| 70 | if (s->type==1 || s->type==4) { |
| 71 | avctx->pix_fmt = AV_PIX_FMT_MONOWHITE; |
| 72 | } else if (s->type==2 || s->type==5) { |
| 73 | if (avctx->codec_id == AV_CODEC_ID_PGMYUV) |
| 74 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| 75 | else |
| 76 | avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
| 77 | } else if (s->type==3 || s->type==6) { |
| 78 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
| 79 | } else if (s->type==7) { |
| 80 | w = -1; |
| 81 | h = -1; |
| 82 | maxval = -1; |
| 83 | depth = -1; |
| 84 | tuple_type[0] = '\0'; |
| 85 | for (;;) { |
| 86 | pnm_get(s, buf1, sizeof(buf1)); |
| 87 | if (!strcmp(buf1, "WIDTH")) { |
| 88 | pnm_get(s, buf1, sizeof(buf1)); |
| 89 | w = strtol(buf1, NULL, 10); |
| 90 | } else if (!strcmp(buf1, "HEIGHT")) { |
| 91 | pnm_get(s, buf1, sizeof(buf1)); |
| 92 | h = strtol(buf1, NULL, 10); |
| 93 | } else if (!strcmp(buf1, "DEPTH")) { |
| 94 | pnm_get(s, buf1, sizeof(buf1)); |
| 95 | depth = strtol(buf1, NULL, 10); |
| 96 | } else if (!strcmp(buf1, "MAXVAL")) { |
| 97 | pnm_get(s, buf1, sizeof(buf1)); |
| 98 | maxval = strtol(buf1, NULL, 10); |
| 99 | } else if (!strcmp(buf1, "TUPLTYPE") || |
| 100 | /* libavcodec used to write invalid files */ |
| 101 | !strcmp(buf1, "TUPLETYPE")) { |
| 102 | pnm_get(s, tuple_type, sizeof(tuple_type)); |
| 103 | } else if (!strcmp(buf1, "ENDHDR")) { |
| 104 | break; |
| 105 | } else { |
| 106 | return AVERROR_INVALIDDATA; |
| 107 | } |
| 108 | } |
| 109 | /* check that all tags are present */ |
| 110 | if (w <= 0 || h <= 0 || maxval <= 0 || depth <= 0 || tuple_type[0] == '\0' || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end) |
| 111 | return AVERROR_INVALIDDATA; |
| 112 | |
| 113 | avctx->width = w; |
| 114 | avctx->height = h; |
| 115 | s->maxval = maxval; |
| 116 | if (depth == 1) { |
| 117 | if (maxval == 1) { |
| 118 | avctx->pix_fmt = AV_PIX_FMT_MONOBLACK; |
| 119 | } else if (maxval < 256) { |
| 120 | avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
| 121 | } else { |
| 122 | avctx->pix_fmt = AV_PIX_FMT_GRAY16; |
| 123 | } |
| 124 | } else if (depth == 2) { |
| 125 | if (maxval == 255) |
| 126 | avctx->pix_fmt = AV_PIX_FMT_GRAY8A; |
| 127 | } else if (depth == 3) { |
| 128 | if (maxval < 256) { |
| 129 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
| 130 | } else { |
| 131 | avctx->pix_fmt = AV_PIX_FMT_RGB48; |
| 132 | } |
| 133 | } else if (depth == 4) { |
| 134 | if (maxval < 256) { |
| 135 | avctx->pix_fmt = AV_PIX_FMT_RGBA; |
| 136 | } else { |
| 137 | avctx->pix_fmt = AV_PIX_FMT_RGBA64; |
| 138 | } |
| 139 | } else { |
| 140 | return AVERROR_INVALIDDATA; |
| 141 | } |
| 142 | return 0; |
| 143 | } else { |
| 144 | return AVERROR_INVALIDDATA; |
| 145 | } |
| 146 | pnm_get(s, buf1, sizeof(buf1)); |
| 147 | w = atoi(buf1); |
| 148 | pnm_get(s, buf1, sizeof(buf1)); |
| 149 | h = atoi(buf1); |
| 150 | if(w <= 0 || h <= 0 || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end) |
| 151 | return AVERROR_INVALIDDATA; |
| 152 | |
| 153 | avctx->width = w; |
| 154 | avctx->height = h; |
| 155 | |
| 156 | if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE && avctx->pix_fmt != AV_PIX_FMT_MONOBLACK) { |
| 157 | pnm_get(s, buf1, sizeof(buf1)); |
| 158 | s->maxval = atoi(buf1); |
| 159 | if (s->maxval <= 0) { |
| 160 | av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval); |
| 161 | s->maxval = 255; |
| 162 | } |
| 163 | if (s->maxval >= 256) { |
| 164 | if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) { |
| 165 | avctx->pix_fmt = AV_PIX_FMT_GRAY16; |
| 166 | } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) { |
| 167 | avctx->pix_fmt = AV_PIX_FMT_RGB48; |
| 168 | } else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && s->maxval < 65536) { |
| 169 | if (s->maxval < 512) |
| 170 | avctx->pix_fmt = AV_PIX_FMT_YUV420P9; |
| 171 | else if (s->maxval < 1024) |
| 172 | avctx->pix_fmt = AV_PIX_FMT_YUV420P10; |
| 173 | else |
| 174 | avctx->pix_fmt = AV_PIX_FMT_YUV420P16; |
| 175 | } else { |
| 176 | av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n"); |
| 177 | avctx->pix_fmt = AV_PIX_FMT_NONE; |
| 178 | return AVERROR_INVALIDDATA; |
| 179 | } |
| 180 | } |
| 181 | }else |
| 182 | s->maxval=1; |
| 183 | /* more check if YUV420 */ |
| 184 | if (av_pix_fmt_desc_get(avctx->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR) { |
| 185 | if ((avctx->width & 1) != 0) |
| 186 | return AVERROR_INVALIDDATA; |
| 187 | h = (avctx->height * 2); |
| 188 | if ((h % 3) != 0) |
| 189 | return AVERROR_INVALIDDATA; |
| 190 | h /= 3; |
| 191 | avctx->height = h; |
| 192 | } |
| 193 | return 0; |
| 194 | } |