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) && (s - str) < buf_size - 1) {
60 while (bs < end && !pnm_space(c))
65 int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s)
67 char buf1[32], tuple_type[32];
68 int h, w, depth, maxval;
71 pnm_get(s, buf1, sizeof(buf1));
73 return AVERROR_INVALIDDATA;
76 if (s->type==1 || s->type==4) {
77 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
78 } else if (s->type==2 || s->type==5) {
79 if (avctx->codec_id == AV_CODEC_ID_PGMYUV)
80 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
82 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
83 } else if (s->type==3 || s->type==6) {
84 avctx->pix_fmt = AV_PIX_FMT_RGB24;
85 } else if (s->type==7) {
92 pnm_get(s, buf1, sizeof(buf1));
93 if (!strcmp(buf1, "WIDTH")) {
94 pnm_get(s, buf1, sizeof(buf1));
95 w = strtol(buf1, NULL, 10);
96 } else if (!strcmp(buf1, "HEIGHT")) {
97 pnm_get(s, buf1, sizeof(buf1));
98 h = strtol(buf1, NULL, 10);
99 } else if (!strcmp(buf1, "DEPTH")) {
100 pnm_get(s, buf1, sizeof(buf1));
101 depth = strtol(buf1, NULL, 10);
102 } else if (!strcmp(buf1, "MAXVAL")) {
103 pnm_get(s, buf1, sizeof(buf1));
104 maxval = strtol(buf1, NULL, 10);
105 } else if (!strcmp(buf1, "TUPLTYPE") ||
106 /* libavcodec used to write invalid files */
107 !strcmp(buf1, "TUPLETYPE")) {
108 pnm_get(s, tuple_type, sizeof(tuple_type));
109 } else if (!strcmp(buf1, "ENDHDR")) {
112 return AVERROR_INVALIDDATA;
115 /* check that all tags are present */
116 if (w <= 0 || h <= 0 || maxval <= 0 || maxval > UINT16_MAX || depth <= 0 || tuple_type[0] == '\0' ||
117 av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
118 return AVERROR_INVALIDDATA;
120 ret = ff_set_dimensions(avctx, w, h);
126 avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
127 } else if (maxval < 256) {
128 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
130 avctx->pix_fmt = AV_PIX_FMT_GRAY16;
132 } else if (depth == 2) {
134 avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
136 avctx->pix_fmt = AV_PIX_FMT_YA16;
138 } else if (depth == 3) {
140 avctx->pix_fmt = AV_PIX_FMT_RGB24;
142 avctx->pix_fmt = AV_PIX_FMT_RGB48;
144 } else if (depth == 4) {
146 avctx->pix_fmt = AV_PIX_FMT_RGBA;
148 avctx->pix_fmt = AV_PIX_FMT_RGBA64;
151 return AVERROR_INVALIDDATA;
155 return AVERROR_INVALIDDATA;
157 pnm_get(s, buf1, sizeof(buf1));
159 pnm_get(s, buf1, sizeof(buf1));
161 if(w <= 0 || h <= 0 || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
162 return AVERROR_INVALIDDATA;
164 ret = ff_set_dimensions(avctx, w, h);
168 if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE && avctx->pix_fmt != AV_PIX_FMT_MONOBLACK) {
169 pnm_get(s, buf1, sizeof(buf1));
170 s->maxval = atoi(buf1);
171 if (s->maxval <= 0 || s->maxval > UINT16_MAX) {
172 av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval);
175 if (s->maxval >= 256) {
176 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
177 avctx->pix_fmt = AV_PIX_FMT_GRAY16;
178 } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
179 avctx->pix_fmt = AV_PIX_FMT_RGB48;
180 } else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && s->maxval < 65536) {
182 avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
183 else if (s->maxval < 1024)
184 avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
186 avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
188 av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n");
189 avctx->pix_fmt = AV_PIX_FMT_NONE;
190 return AVERROR_INVALIDDATA;
195 /* more check if YUV420 */
196 if (av_pix_fmt_desc_get(avctx->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR) {
197 if ((avctx->width & 1) != 0)
198 return AVERROR_INVALIDDATA;
199 h = (avctx->height * 2);
201 return AVERROR_INVALIDDATA;