2 * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder
3 * Copyright (c) 2007, 2008 Ivo van Poorten
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/intreadwrite.h"
27 #define RT_BYTE_ENCODED 2
28 #define RT_FORMAT_RGB 3
29 #define RT_FORMAT_TIFF 4
30 #define RT_FORMAT_IFF 5
32 typedef struct SUNRASTContext {
36 static av_cold int sunrast_init(AVCodecContext *avctx) {
37 SUNRASTContext *s = avctx->priv_data;
39 avcodec_get_frame_defaults(&s->picture);
40 avctx->coded_frame= &s->picture;
45 static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
46 int *data_size, const uint8_t *buf, int buf_size) {
47 SUNRASTContext * const s = avctx->priv_data;
48 AVFrame *picture = data;
49 AVFrame * const p = &s->picture;
50 unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
52 const uint8_t *bufstart = buf;
54 if (AV_RB32(buf) != 0x59a66a95) {
55 av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
61 depth = AV_RB32(buf+12);
62 type = AV_RB32(buf+20);
63 maptype = AV_RB32(buf+24);
64 maplength = AV_RB32(buf+28);
66 if (type > RT_BYTE_ENCODED && type <= RT_FORMAT_IFF) {
67 av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
70 if (type > RT_FORMAT_IFF) {
71 av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
75 av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
83 avctx->pix_fmt = PIX_FMT_MONOWHITE;
86 avctx->pix_fmt = PIX_FMT_PAL8;
89 avctx->pix_fmt = PIX_FMT_BGR24;
92 av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
97 avctx->release_buffer(avctx, p);
99 if (avcodec_check_dimensions(avctx, w, h))
101 if (w != avctx->width || h != avctx->height)
102 avcodec_set_dimensions(avctx, w, h);
103 if (avctx->get_buffer(avctx, p) < 0) {
104 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
108 p->pict_type = FF_I_TYPE;
110 if (depth != 8 && maplength) {
111 av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
113 } else if (depth == 8) {
114 unsigned int len = maplength / 3;
117 av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
120 if (maplength % 3 || maplength > 768) {
121 av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
126 for (x=0; x<len; x++, ptr+=4)
127 *(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
133 stride = p->linesize[0];
135 /* scanlines are aligned on 16 bit boundaries */
136 len = (depth * w + 7) >> 3;
137 alen = len + (len&1);
139 if (type == RT_BYTE_ENCODED) {
141 uint8_t *end = ptr + h*stride;
146 if ((value = *buf++) == 0x80) {
163 for (y=0; y<h; y++) {
164 memcpy(ptr, buf, len);
170 *picture = s->picture;
171 *data_size = sizeof(AVFrame);
173 return buf - bufstart;
176 static av_cold int sunrast_end(AVCodecContext *avctx) {
177 SUNRASTContext *s = avctx->priv_data;
179 if(s->picture.data[0])
180 avctx->release_buffer(avctx, &s->picture);
185 AVCodec sunrast_decoder = {
189 sizeof(SUNRASTContext),
193 sunrast_decode_frame,
196 .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),