p*menc: use the AVFrame API properly.
[libav.git] / libavcodec / pnm.c
1 /*
2 * PNM image format
3 * Copyright (c) 2002, 2003 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 for (;;) {
41 c = *sc->bytestream++;
42 if (c == '#') {
43 do {
44 c = *sc->bytestream++;
45 } while (c != '\n' && sc->bytestream < sc->bytestream_end);
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 s->type= buf1[1]-'0';
67 if(buf1[0] != 'P')
68 return AVERROR_INVALIDDATA;
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))
111 return AVERROR_INVALIDDATA;
112
113 avctx->width = w;
114 avctx->height = h;
115 if (depth == 1) {
116 if (maxval == 1)
117 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
118 else
119 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
120 } else if (depth == 3) {
121 if (maxval < 256) {
122 avctx->pix_fmt = AV_PIX_FMT_RGB24;
123 } else {
124 av_log(avctx, AV_LOG_ERROR, "16-bit components are only supported for grayscale\n");
125 avctx->pix_fmt = AV_PIX_FMT_NONE;
126 return AVERROR_INVALIDDATA;
127 }
128 } else if (depth == 4) {
129 avctx->pix_fmt = AV_PIX_FMT_RGB32;
130 } else {
131 return AVERROR_INVALIDDATA;
132 }
133 return 0;
134 } else {
135 return AVERROR_INVALIDDATA;
136 }
137 pnm_get(s, buf1, sizeof(buf1));
138 avctx->width = atoi(buf1);
139 if (avctx->width <= 0)
140 return AVERROR_INVALIDDATA;
141 pnm_get(s, buf1, sizeof(buf1));
142 avctx->height = atoi(buf1);
143 if(av_image_check_size(avctx->width, avctx->height, 0, avctx))
144 return AVERROR_INVALIDDATA;
145 if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE) {
146 pnm_get(s, buf1, sizeof(buf1));
147 s->maxval = atoi(buf1);
148 if (s->maxval <= 0) {
149 av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval);
150 s->maxval = 255;
151 }
152 if (s->maxval >= 256) {
153 if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
154 avctx->pix_fmt = AV_PIX_FMT_GRAY16BE;
155 if (s->maxval != 65535)
156 avctx->pix_fmt = AV_PIX_FMT_GRAY16;
157 } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
158 if (s->maxval > 255)
159 avctx->pix_fmt = AV_PIX_FMT_RGB48BE;
160 } else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && s->maxval < 65536) {
161 if (s->maxval < 512)
162 avctx->pix_fmt = AV_PIX_FMT_YUV420P9BE;
163 else if (s->maxval < 1024)
164 avctx->pix_fmt = AV_PIX_FMT_YUV420P10BE;
165 else
166 avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
167 } else {
168 av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n");
169 avctx->pix_fmt = AV_PIX_FMT_NONE;
170 return AVERROR_INVALIDDATA;
171 }
172 }
173 }else
174 s->maxval=1;
175 /* more check if YUV420 */
176 if (av_pix_fmt_desc_get(avctx->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR) {
177 if ((avctx->width & 1) != 0)
178 return AVERROR_INVALIDDATA;
179 h = (avctx->height * 2);
180 if ((h % 3) != 0)
181 return AVERROR_INVALIDDATA;
182 h /= 3;
183 avctx->height = h;
184 }
185 return 0;
186 }