3 * Copyright (c) 2002, 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
25 #include "libavutil/imgutils.h"
30 static inline int pnm_space(int c)
32 return c == ' ' || c == '\n' || c == '\r' || c == '\t';
35 static void pnm_get(PNMContext *sc, char *str, int buf_size)
39 uint8_t *bs = sc->bytestream;
40 const uint8_t *end = sc->bytestream_end;
42 /* skip spaces and comments */
46 while (c != '\n' && bs < end) {
49 } else if (!pnm_space(c)) {
55 while (bs < end && !pnm_space(c)) {
56 if ((s - str) < buf_size - 1)
64 int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s)
66 char buf1[32], tuple_type[32];
67 int h, w, depth, maxval;
70 pnm_get(s, buf1, sizeof(buf1));
72 return AVERROR_INVALIDDATA;
75 if (s->type==1 || s->type==4) {
76 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
77 } else if (s->type==2 || s->type==5) {
78 if (avctx->codec_id == AV_CODEC_ID_PGMYUV)
79 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
81 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
82 } else if (s->type==3 || s->type==6) {
83 avctx->pix_fmt = AV_PIX_FMT_RGB24;
84 } else if (s->type==7) {
91 pnm_get(s, buf1, sizeof(buf1));
92 if (!strcmp(buf1, "WIDTH")) {
93 pnm_get(s, buf1, sizeof(buf1));
94 w = strtol(buf1, NULL, 10);
95 } else if (!strcmp(buf1, "HEIGHT")) {
96 pnm_get(s, buf1, sizeof(buf1));
97 h = strtol(buf1, NULL, 10);
98 } else if (!strcmp(buf1, "DEPTH")) {
99 pnm_get(s, buf1, sizeof(buf1));
100 depth = strtol(buf1, NULL, 10);
101 } else if (!strcmp(buf1, "MAXVAL")) {
102 pnm_get(s, buf1, sizeof(buf1));
103 maxval = strtol(buf1, NULL, 10);
104 } else if (!strcmp(buf1, "TUPLTYPE") ||
105 /* libavcodec used to write invalid files */
106 !strcmp(buf1, "TUPLETYPE")) {
107 pnm_get(s, tuple_type, sizeof(tuple_type));
108 } else if (!strcmp(buf1, "ENDHDR")) {
111 return AVERROR_INVALIDDATA;
114 /* check that all tags are present */
115 if (w <= 0 || h <= 0 || maxval <= 0 || maxval > UINT16_MAX || depth <= 0 || tuple_type[0] == '\0' ||
116 av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
117 return AVERROR_INVALIDDATA;
119 ret = ff_set_dimensions(avctx, w, h);
125 avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
126 } else if (maxval < 256) {
127 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
129 avctx->pix_fmt = AV_PIX_FMT_GRAY16;
131 } else if (depth == 2) {
133 avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
135 avctx->pix_fmt = AV_PIX_FMT_YA16;
137 } else if (depth == 3) {
139 avctx->pix_fmt = AV_PIX_FMT_RGB24;
141 avctx->pix_fmt = AV_PIX_FMT_RGB48;
143 } else if (depth == 4) {
145 avctx->pix_fmt = AV_PIX_FMT_RGBA;
147 avctx->pix_fmt = AV_PIX_FMT_RGBA64;
150 return AVERROR_INVALIDDATA;
154 return AVERROR_INVALIDDATA;
156 pnm_get(s, buf1, sizeof(buf1));
158 pnm_get(s, buf1, sizeof(buf1));
160 if(w <= 0 || h <= 0 || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
161 return AVERROR_INVALIDDATA;
163 ret = ff_set_dimensions(avctx, w, h);
167 if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE && avctx->pix_fmt != AV_PIX_FMT_MONOBLACK) {
168 pnm_get(s, buf1, sizeof(buf1));
169 s->maxval = atoi(buf1);
170 if (s->maxval <= 0 || s->maxval > UINT16_MAX) {
171 av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval);
174 if (s->maxval >= 256) {
175 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
176 avctx->pix_fmt = AV_PIX_FMT_GRAY16;
177 } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
178 avctx->pix_fmt = AV_PIX_FMT_RGB48;
179 } else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && s->maxval < 65536) {
181 avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
182 else if (s->maxval < 1024)
183 avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
185 avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
187 av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n");
188 avctx->pix_fmt = AV_PIX_FMT_NONE;
189 return AVERROR_INVALIDDATA;
194 /* more check if YUV420 */
195 if (av_pix_fmt_desc_get(avctx->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR) {
196 if ((avctx->width & 1) != 0)
197 return AVERROR_INVALIDDATA;
198 h = (avctx->height * 2);
200 return AVERROR_INVALIDDATA;