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));
66 if (s->type==1 || s->type==4) {
67 avctx->pix_fmt = PIX_FMT_MONOWHITE;
68 } else if (s->type==2 || s->type==5) {
69 if (avctx->codec_id == CODEC_ID_PGMYUV)
70 avctx->pix_fmt = PIX_FMT_YUV420P;
72 avctx->pix_fmt = PIX_FMT_GRAY8;
73 } else if (s->type==3 || s->type==6) {
74 avctx->pix_fmt = PIX_FMT_RGB24;
75 } else if (s->type==7) {
82 pnm_get(s, buf1, sizeof(buf1));
83 if (!strcmp(buf1, "WIDTH")) {
84 pnm_get(s, buf1, sizeof(buf1));
85 w = strtol(buf1, NULL, 10);
86 } else if (!strcmp(buf1, "HEIGHT")) {
87 pnm_get(s, buf1, sizeof(buf1));
88 h = strtol(buf1, NULL, 10);
89 } else if (!strcmp(buf1, "DEPTH")) {
90 pnm_get(s, buf1, sizeof(buf1));
91 depth = strtol(buf1, NULL, 10);
92 } else if (!strcmp(buf1, "MAXVAL")) {
93 pnm_get(s, buf1, sizeof(buf1));
94 maxval = strtol(buf1, NULL, 10);
95 } else if (!strcmp(buf1, "TUPLETYPE")) {
96 pnm_get(s, tuple_type, sizeof(tuple_type));
97 } else if (!strcmp(buf1, "ENDHDR")) {
103 /* check that all tags are present */
104 if (w <= 0 || h <= 0 || maxval <= 0 || depth <= 0 || tuple_type[0] == '\0' || avcodec_check_dimensions(avctx, w, h))
111 avctx->pix_fmt = PIX_FMT_MONOWHITE;
113 avctx->pix_fmt = PIX_FMT_GRAY8;
114 } else if (depth == 3) {
116 avctx->pix_fmt = PIX_FMT_RGB24;
118 av_log(avctx, AV_LOG_ERROR, "16-bit components are only supported for grayscale\n");
119 avctx->pix_fmt = PIX_FMT_NONE;
122 } else if (depth == 4) {
123 avctx->pix_fmt = PIX_FMT_RGB32;
131 pnm_get(s, buf1, sizeof(buf1));
132 avctx->width = atoi(buf1);
133 if (avctx->width <= 0)
135 pnm_get(s, buf1, sizeof(buf1));
136 avctx->height = atoi(buf1);
137 if(avcodec_check_dimensions(avctx, avctx->width, avctx->height))
139 if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
140 pnm_get(s, buf1, sizeof(buf1));
141 s->maxval = atoi(buf1);
142 if (s->maxval >= 256) {
143 if (avctx->pix_fmt == PIX_FMT_GRAY8) {
144 avctx->pix_fmt = PIX_FMT_GRAY16BE;
145 if (s->maxval != 65535)
146 avctx->pix_fmt = PIX_FMT_GRAY16;
147 } else if (avctx->pix_fmt == PIX_FMT_RGB24) {
149 avctx->pix_fmt = PIX_FMT_RGB48BE;
151 av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n");
152 avctx->pix_fmt = PIX_FMT_NONE;
158 /* more check if YUV420 */
159 if (avctx->pix_fmt == PIX_FMT_YUV420P) {
160 if ((avctx->width & 1) != 0)
162 h = (avctx->height * 2);
171 av_cold int ff_pnm_end(AVCodecContext *avctx)
173 PNMContext *s = avctx->priv_data;
175 if (s->picture.data[0])
176 avctx->release_buffer(avctx, &s->picture);
181 av_cold int ff_pnm_init(AVCodecContext *avctx)
183 PNMContext *s = avctx->priv_data;
185 avcodec_get_frame_defaults((AVFrame*)&s->picture);
186 avctx->coded_frame = (AVFrame*)&s->picture;