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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * PNM image format |
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| 3 | * Copyright (c) 2002, 2003 Fabrice Bellard |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include |
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| 23 | #include |
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| 24 | |||
| 25 | #include "libavutil/imgutils.h" |
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| 26 | #include "avcodec.h" |
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| 27 | #include "pnm.h" |
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| 28 | |||
| 29 | static inline int pnm_space(int c) |
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| 30 | { |
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| 31 | return c == ' ' || c == '\n' || c == '\r' || c == '\t'; |
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| 32 | } |
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| 33 | |||
| 34 | static void pnm_get(PNMContext *sc, char *str, int buf_size) |
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| 35 | { |
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| 36 | char *s; |
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| 37 | int c; |
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| 38 | |||
| 39 | /* skip spaces and comments */ |
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| 40 | while (sc->bytestream < sc->bytestream_end) { |
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| 41 | c = *sc->bytestream++; |
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| 42 | if (c == '#') { |
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| 43 | while (c != '\n' && sc->bytestream < sc->bytestream_end) { |
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| 44 | c = *sc->bytestream++; |
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| 45 | } |
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| 46 | } else if (!pnm_space(c)) { |
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| 47 | break; |
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| 48 | } |
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| 49 | } |
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| 50 | |||
| 51 | s = str; |
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| 52 | while (sc->bytestream < sc->bytestream_end && !pnm_space(c)) { |
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| 53 | if ((s - str) < buf_size - 1) |
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| 54 | *s++ = c; |
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| 55 | c = *sc->bytestream++; |
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| 56 | } |
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| 57 | *s = '\0'; |
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| 58 | } |
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| 59 | |||
| 60 | int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s) |
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| 61 | { |
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| 62 | char buf1[32], tuple_type[32]; |
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| 63 | int h, w, depth, maxval; |
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| 64 | |||
| 65 | pnm_get(s, buf1, sizeof(buf1)); |
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| 66 | s->type= buf1[1]-'0'; |
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| 67 | if(buf1[0] != 'P') |
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| 68 | return AVERROR_INVALIDDATA; |
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| 69 | |||
| 70 | if (s->type==1 || s->type==4) { |
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| 71 | avctx->pix_fmt = AV_PIX_FMT_MONOWHITE; |
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| 72 | } else if (s->type==2 || s->type==5) { |
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| 73 | if (avctx->codec_id == AV_CODEC_ID_PGMYUV) |
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| 74 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
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| 75 | else |
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| 76 | avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
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| 77 | } else if (s->type==3 || s->type==6) { |
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| 78 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
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| 79 | } else if (s->type==7) { |
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| 80 | w = -1; |
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| 81 | h = -1; |
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| 82 | maxval = -1; |
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| 83 | depth = -1; |
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| 84 | tuple_type[0] = '\0'; |
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| 85 | for (;;) { |
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| 86 | pnm_get(s, buf1, sizeof(buf1)); |
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| 87 | if (!strcmp(buf1, "WIDTH")) { |
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| 88 | pnm_get(s, buf1, sizeof(buf1)); |
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| 89 | w = strtol(buf1, NULL, 10); |
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| 90 | } else if (!strcmp(buf1, "HEIGHT")) { |
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| 91 | pnm_get(s, buf1, sizeof(buf1)); |
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| 92 | h = strtol(buf1, NULL, 10); |
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| 93 | } else if (!strcmp(buf1, "DEPTH")) { |
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| 94 | pnm_get(s, buf1, sizeof(buf1)); |
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| 95 | depth = strtol(buf1, NULL, 10); |
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| 96 | } else if (!strcmp(buf1, "MAXVAL")) { |
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| 97 | pnm_get(s, buf1, sizeof(buf1)); |
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| 98 | maxval = strtol(buf1, NULL, 10); |
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| 99 | } else if (!strcmp(buf1, "TUPLTYPE") || |
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| 100 | /* libavcodec used to write invalid files */ |
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| 101 | !strcmp(buf1, "TUPLETYPE")) { |
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| 102 | pnm_get(s, tuple_type, sizeof(tuple_type)); |
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| 103 | } else if (!strcmp(buf1, "ENDHDR")) { |
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| 104 | break; |
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| 105 | } else { |
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| 106 | return AVERROR_INVALIDDATA; |
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| 107 | } |
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| 108 | } |
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| 109 | /* check that all tags are present */ |
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| 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) |
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| 111 | return AVERROR_INVALIDDATA; |
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| 112 | |||
| 113 | avctx->width = w; |
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| 114 | avctx->height = h; |
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| 115 | s->maxval = maxval; |
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| 116 | if (depth == 1) { |
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| 117 | if (maxval == 1) { |
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| 118 | avctx->pix_fmt = AV_PIX_FMT_MONOBLACK; |
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| 119 | } else if (maxval < 256) { |
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| 120 | avctx->pix_fmt = AV_PIX_FMT_GRAY8; |
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| 121 | } else { |
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| 122 | avctx->pix_fmt = AV_PIX_FMT_GRAY16; |
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| 123 | } |
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| 124 | } else if (depth == 2) { |
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| 125 | if (maxval == 255) |
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| 126 | avctx->pix_fmt = AV_PIX_FMT_GRAY8A; |
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| 127 | } else if (depth == 3) { |
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| 128 | if (maxval < 256) { |
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| 129 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
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| 130 | } else { |
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| 131 | avctx->pix_fmt = AV_PIX_FMT_RGB48; |
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| 132 | } |
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| 133 | } else if (depth == 4) { |
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| 134 | if (maxval < 256) { |
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| 135 | avctx->pix_fmt = AV_PIX_FMT_RGBA; |
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| 136 | } else { |
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| 137 | avctx->pix_fmt = AV_PIX_FMT_RGBA64; |
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| 138 | } |
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| 139 | } else { |
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| 140 | return AVERROR_INVALIDDATA; |
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| 141 | } |
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| 142 | return 0; |
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| 143 | } else { |
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| 144 | return AVERROR_INVALIDDATA; |
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| 145 | } |
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| 146 | pnm_get(s, buf1, sizeof(buf1)); |
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| 147 | w = atoi(buf1); |
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| 148 | pnm_get(s, buf1, sizeof(buf1)); |
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| 149 | h = atoi(buf1); |
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| 150 | if(w <= 0 || h <= 0 || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end) |
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| 151 | return AVERROR_INVALIDDATA; |
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| 152 | |||
| 153 | avctx->width = w; |
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| 154 | avctx->height = h; |
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| 155 | |||
| 156 | if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE && avctx->pix_fmt != AV_PIX_FMT_MONOBLACK) { |
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| 157 | pnm_get(s, buf1, sizeof(buf1)); |
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| 158 | s->maxval = atoi(buf1); |
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| 159 | if (s->maxval <= 0) { |
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| 160 | av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval); |
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| 161 | s->maxval = 255; |
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| 162 | } |
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| 163 | if (s->maxval >= 256) { |
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| 164 | if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) { |
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| 165 | avctx->pix_fmt = AV_PIX_FMT_GRAY16; |
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| 166 | } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) { |
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| 167 | avctx->pix_fmt = AV_PIX_FMT_RGB48; |
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| 168 | } else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && s->maxval < 65536) { |
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| 169 | if (s->maxval < 512) |
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| 170 | avctx->pix_fmt = AV_PIX_FMT_YUV420P9; |
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| 171 | else if (s->maxval < 1024) |
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| 172 | avctx->pix_fmt = AV_PIX_FMT_YUV420P10; |
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| 173 | else |
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| 174 | avctx->pix_fmt = AV_PIX_FMT_YUV420P16; |
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| 175 | } else { |
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| 176 | av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n"); |
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| 177 | avctx->pix_fmt = AV_PIX_FMT_NONE; |
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| 178 | return AVERROR_INVALIDDATA; |
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| 179 | } |
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| 180 | } |
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| 181 | }else |
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| 182 | s->maxval=1; |
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| 183 | /* more check if YUV420 */ |
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| 184 | if (av_pix_fmt_desc_get(avctx->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR) { |
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| 185 | if ((avctx->width & 1) != 0) |
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| 186 | return AVERROR_INVALIDDATA; |
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| 187 | h = (avctx->height * 2); |
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| 188 | if ((h % 3) != 0) |
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| 189 | return AVERROR_INVALIDDATA; |
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| 190 | h /= 3; |
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| 191 | avctx->height = h; |
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| 192 | } |
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| 193 | return 0; |
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| 194 | } |