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
22 #include "libavutil/imgutils.h"
26 static inline int pnm_space(int c)
28 return c == ' ' || c == '\n' || c == '\r' || c == '\t';
31 static void pnm_get(PNMContext *sc, char *str, int buf_size)
36 /* skip spaces and comments */
38 c = *sc->bytestream++;
41 c = *sc->bytestream++;
42 } while (c != '\n' && sc->bytestream < sc->bytestream_end);
43 } else if (!pnm_space(c)) {
49 while (sc->bytestream < sc->bytestream_end && !pnm_space(c)) {
50 if ((s - str) < buf_size - 1)
52 c = *sc->bytestream++;
57 int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s)
59 char buf1[32], tuple_type[32];
60 int h, w, depth, maxval;
62 pnm_get(s, buf1, sizeof(buf1));
67 if (s->type==1 || s->type==4) {
68 avctx->pix_fmt = PIX_FMT_MONOWHITE;
69 } else if (s->type==2 || s->type==5) {
70 if (avctx->codec_id == CODEC_ID_PGMYUV)
71 avctx->pix_fmt = PIX_FMT_YUV420P;
73 avctx->pix_fmt = PIX_FMT_GRAY8;
74 } else if (s->type==3 || s->type==6) {
75 avctx->pix_fmt = PIX_FMT_RGB24;
76 } else if (s->type==7) {
83 pnm_get(s, buf1, sizeof(buf1));
84 if (!strcmp(buf1, "WIDTH")) {
85 pnm_get(s, buf1, sizeof(buf1));
86 w = strtol(buf1, NULL, 10);
87 } else if (!strcmp(buf1, "HEIGHT")) {
88 pnm_get(s, buf1, sizeof(buf1));
89 h = strtol(buf1, NULL, 10);
90 } else if (!strcmp(buf1, "DEPTH")) {
91 pnm_get(s, buf1, sizeof(buf1));
92 depth = strtol(buf1, NULL, 10);
93 } else if (!strcmp(buf1, "MAXVAL")) {
94 pnm_get(s, buf1, sizeof(buf1));
95 maxval = strtol(buf1, NULL, 10);
96 } else if (!strcmp(buf1, "TUPLETYPE")) {
97 pnm_get(s, tuple_type, sizeof(tuple_type));
98 } else if (!strcmp(buf1, "ENDHDR")) {
104 /* check that all tags are present */
105 if (w <= 0 || h <= 0 || maxval <= 0 || depth <= 0 || tuple_type[0] == '\0' || av_image_check_size(w, h, 0, avctx))
112 avctx->pix_fmt = PIX_FMT_MONOWHITE;
114 avctx->pix_fmt = PIX_FMT_GRAY8;
115 } else if (depth == 3) {
117 avctx->pix_fmt = PIX_FMT_RGB24;
119 av_log(avctx, AV_LOG_ERROR, "16-bit components are only supported for grayscale\n");
120 avctx->pix_fmt = PIX_FMT_NONE;
123 } else if (depth == 4) {
124 avctx->pix_fmt = PIX_FMT_RGB32;
132 pnm_get(s, buf1, sizeof(buf1));
133 avctx->width = atoi(buf1);
134 if (avctx->width <= 0)
136 pnm_get(s, buf1, sizeof(buf1));
137 avctx->height = atoi(buf1);
138 if(av_image_check_size(avctx->width, avctx->height, 0, avctx))
140 if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
141 pnm_get(s, buf1, sizeof(buf1));
142 s->maxval = atoi(buf1);
143 if (s->maxval <= 0) {
144 av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval);
147 if (s->maxval >= 256) {
148 if (avctx->pix_fmt == PIX_FMT_GRAY8) {
149 avctx->pix_fmt = PIX_FMT_GRAY16BE;
150 if (s->maxval != 65535)
151 avctx->pix_fmt = PIX_FMT_GRAY16;
152 } else if (avctx->pix_fmt == PIX_FMT_RGB24) {
154 avctx->pix_fmt = PIX_FMT_RGB48BE;
156 av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n");
157 avctx->pix_fmt = PIX_FMT_NONE;
163 /* more check if YUV420 */
164 if (avctx->pix_fmt == PIX_FMT_YUV420P) {
165 if ((avctx->width & 1) != 0)
167 h = (avctx->height * 2);
176 av_cold int ff_pnm_end(AVCodecContext *avctx)
178 PNMContext *s = avctx->priv_data;
180 if (s->picture.data[0])
181 avctx->release_buffer(avctx, &s->picture);
186 av_cold int ff_pnm_init(AVCodecContext *avctx)
188 PNMContext *s = avctx->priv_data;
190 avcodec_get_frame_defaults((AVFrame*)&s->picture);
191 avctx->coded_frame = (AVFrame*)&s->picture;