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, AVPacket *avpkt) {
47 const uint8_t *buf = avpkt->data;
48 SUNRASTContext * const s = avctx->priv_data;
49 AVFrame *picture = data;
50 AVFrame * const p = &s->picture;
51 unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
53 const uint8_t *bufstart = buf;
55 if (AV_RB32(buf) != 0x59a66a95) {
56 av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
62 depth = AV_RB32(buf+12);
63 type = AV_RB32(buf+20);
64 maptype = AV_RB32(buf+24);
65 maplength = AV_RB32(buf+28);
67 if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF) {
68 av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
71 if (type > RT_FORMAT_IFF) {
72 av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
76 av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
84 avctx->pix_fmt = PIX_FMT_MONOWHITE;
87 avctx->pix_fmt = PIX_FMT_PAL8;
90 avctx->pix_fmt = (type == RT_FORMAT_RGB) ? PIX_FMT_RGB24 : PIX_FMT_BGR24;
93 av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
98 avctx->release_buffer(avctx, p);
100 if (avcodec_check_dimensions(avctx, w, h))
102 if (w != avctx->width || h != avctx->height)
103 avcodec_set_dimensions(avctx, w, h);
104 if (avctx->get_buffer(avctx, p) < 0) {
105 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
109 p->pict_type = FF_I_TYPE;
111 if (depth != 8 && maplength) {
112 av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
114 } else if (depth == 8) {
115 unsigned int len = maplength / 3;
118 av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
121 if (maplength % 3 || maplength > 768) {
122 av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
127 for (x=0; x<len; x++, ptr+=4)
128 *(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
134 stride = p->linesize[0];
136 /* scanlines are aligned on 16 bit boundaries */
137 len = (depth * w + 7) >> 3;
138 alen = len + (len&1);
140 if (type == RT_BYTE_ENCODED) {
142 uint8_t *end = ptr + h*stride;
147 if ((value = *buf++) == 0x80) {
164 for (y=0; y<h; y++) {
165 memcpy(ptr, buf, len);
171 *picture = s->picture;
172 *data_size = sizeof(AVFrame);
174 return buf - bufstart;
177 static av_cold int sunrast_end(AVCodecContext *avctx) {
178 SUNRASTContext *s = avctx->priv_data;
180 if(s->picture.data[0])
181 avctx->release_buffer(avctx, &s->picture);
186 AVCodec sunrast_decoder = {
190 sizeof(SUNRASTContext),
194 sunrast_decode_frame,
197 .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),