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 static inline int pnm_space(int c)
27 return c == ' ' || c == '\n' || c == '\r' || c == '\t';
30 static void pnm_get(PNMContext *sc, char *str, int buf_size)
35 /* skip spaces and comments */
37 c = *sc->bytestream++;
40 c = *sc->bytestream++;
41 } while (c != '\n' && sc->bytestream < sc->bytestream_end);
42 } else if (!pnm_space(c)) {
48 while (sc->bytestream < sc->bytestream_end && !pnm_space(c)) {
49 if ((s - str) < buf_size - 1)
51 c = *sc->bytestream++;
56 int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s)
58 char buf1[32], tuple_type[32];
59 int h, w, depth, maxval;
61 pnm_get(s, buf1, sizeof(buf1));
62 if (!strcmp(buf1, "P4")) {
63 avctx->pix_fmt = PIX_FMT_MONOWHITE;
64 } else if (!strcmp(buf1, "P5")) {
65 if (avctx->codec_id == CODEC_ID_PGMYUV)
66 avctx->pix_fmt = PIX_FMT_YUV420P;
68 avctx->pix_fmt = PIX_FMT_GRAY8;
69 } else if (!strcmp(buf1, "P6")) {
70 avctx->pix_fmt = PIX_FMT_RGB24;
71 } else if (!strcmp(buf1, "P7")) {
78 pnm_get(s, buf1, sizeof(buf1));
79 if (!strcmp(buf1, "WIDTH")) {
80 pnm_get(s, buf1, sizeof(buf1));
81 w = strtol(buf1, NULL, 10);
82 } else if (!strcmp(buf1, "HEIGHT")) {
83 pnm_get(s, buf1, sizeof(buf1));
84 h = strtol(buf1, NULL, 10);
85 } else if (!strcmp(buf1, "DEPTH")) {
86 pnm_get(s, buf1, sizeof(buf1));
87 depth = strtol(buf1, NULL, 10);
88 } else if (!strcmp(buf1, "MAXVAL")) {
89 pnm_get(s, buf1, sizeof(buf1));
90 maxval = strtol(buf1, NULL, 10);
91 } else if (!strcmp(buf1, "TUPLETYPE")) {
92 pnm_get(s, tuple_type, sizeof(tuple_type));
93 } else if (!strcmp(buf1, "ENDHDR")) {
99 /* check that all tags are present */
100 if (w <= 0 || h <= 0 || maxval <= 0 || depth <= 0 || tuple_type[0] == '\0' || avcodec_check_dimensions(avctx, w, h))
107 avctx->pix_fmt = PIX_FMT_MONOWHITE;
109 avctx->pix_fmt = PIX_FMT_GRAY8;
110 } else if (depth == 3) {
112 avctx->pix_fmt = PIX_FMT_RGB24;
114 av_log(avctx, AV_LOG_ERROR, "16-bit components are only supported for grayscale\n");
115 avctx->pix_fmt = PIX_FMT_NONE;
118 } else if (depth == 4) {
119 avctx->pix_fmt = PIX_FMT_RGB32;
127 pnm_get(s, buf1, sizeof(buf1));
128 avctx->width = atoi(buf1);
129 if (avctx->width <= 0)
131 pnm_get(s, buf1, sizeof(buf1));
132 avctx->height = atoi(buf1);
133 if(avcodec_check_dimensions(avctx, avctx->width, avctx->height))
135 if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
136 pnm_get(s, buf1, sizeof(buf1));
137 s->maxval = atoi(buf1);
138 if (s->maxval >= 256) {
139 if (avctx->pix_fmt == PIX_FMT_GRAY8) {
140 avctx->pix_fmt = PIX_FMT_GRAY16BE;
141 if (s->maxval != 65535)
142 avctx->pix_fmt = PIX_FMT_GRAY16;
143 } else if (avctx->pix_fmt == PIX_FMT_RGB24) {
145 avctx->pix_fmt = PIX_FMT_RGB48BE;
147 av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n");
148 avctx->pix_fmt = PIX_FMT_NONE;
153 /* more check if YUV420 */
154 if (avctx->pix_fmt == PIX_FMT_YUV420P) {
155 if ((avctx->width & 1) != 0)
157 h = (avctx->height * 2);
166 av_cold int ff_pnm_end(AVCodecContext *avctx)
168 PNMContext *s = avctx->priv_data;
170 if (s->picture.data[0])
171 avctx->release_buffer(avctx, &s->picture);
176 av_cold int ff_pnm_init(AVCodecContext *avctx)
178 PNMContext *s = avctx->priv_data;
180 avcodec_get_frame_defaults((AVFrame*)&s->picture);
181 avctx->coded_frame = (AVFrame*)&s->picture;