Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / pnm.c
CommitLineData
2ba45a60
DM
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
29static inline int pnm_space(int c)
30{
31 return c == ' ' || c == '\n' || c == '\r' || c == '\t';
32}
33
34static 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
60int 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}