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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 | } |