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 Libav.
7 * Libav 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 * Libav 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 Libav; 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"
23 #include "libavutil/imgutils.h"
28 #define RT_BYTE_ENCODED 2
29 #define RT_FORMAT_RGB 3
30 #define RT_FORMAT_TIFF 4
31 #define RT_FORMAT_IFF 5
33 typedef struct SUNRASTContext {
37 static av_cold int sunrast_init(AVCodecContext *avctx) {
38 SUNRASTContext *s = avctx->priv_data;
40 avcodec_get_frame_defaults(&s->picture);
41 avctx->coded_frame= &s->picture;
46 static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
47 int *data_size, AVPacket *avpkt) {
48 const uint8_t *buf = avpkt->data;
49 const uint8_t *buf_end = avpkt->data + avpkt->size;
50 SUNRASTContext * const s = avctx->priv_data;
51 AVFrame *picture = data;
52 AVFrame * const p = &s->picture;
53 unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
55 const uint8_t *bufstart = buf;
58 return AVERROR_INVALIDDATA;
60 if (AV_RB32(buf) != 0x59a66a95) {
61 av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
67 depth = AV_RB32(buf+12);
68 type = AV_RB32(buf+20);
69 maptype = AV_RB32(buf+24);
70 maplength = AV_RB32(buf+28);
72 if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF) {
73 av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
76 if (type > RT_FORMAT_IFF) {
77 av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
81 av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
89 avctx->pix_fmt = PIX_FMT_MONOWHITE;
92 avctx->pix_fmt = PIX_FMT_PAL8;
95 avctx->pix_fmt = (type == RT_FORMAT_RGB) ? PIX_FMT_RGB24 : PIX_FMT_BGR24;
98 av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
103 avctx->release_buffer(avctx, p);
105 if (av_image_check_size(w, h, 0, avctx))
107 if (w != avctx->width || h != avctx->height)
108 avcodec_set_dimensions(avctx, w, h);
109 if (avctx->get_buffer(avctx, p) < 0) {
110 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
114 p->pict_type = AV_PICTURE_TYPE_I;
116 if (buf_end - buf < maplength)
117 return AVERROR_INVALIDDATA;
119 if (depth != 8 && maplength) {
120 av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
122 } else if (depth == 8) {
123 unsigned int len = maplength / 3;
126 av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
129 if (maplength % 3 || maplength > 768) {
130 av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
135 for (x=0; x<len; x++, ptr+=4)
136 *(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
142 stride = p->linesize[0];
144 /* scanlines are aligned on 16 bit boundaries */
145 len = (depth * w + 7) >> 3;
146 alen = len + (len&1);
148 if (type == RT_BYTE_ENCODED) {
150 uint8_t *end = ptr + h*stride;
153 while (ptr != end && buf < buf_end) {
155 if (buf_end - buf < 1)
156 return AVERROR_INVALIDDATA;
158 if ((value = *buf++) == 0x80) {
175 for (y=0; y<h; y++) {
176 if (buf_end - buf < len)
178 memcpy(ptr, buf, len);
184 *picture = s->picture;
185 *data_size = sizeof(AVFrame);
187 return buf - bufstart;
190 static av_cold int sunrast_end(AVCodecContext *avctx) {
191 SUNRASTContext *s = avctx->priv_data;
193 if(s->picture.data[0])
194 avctx->release_buffer(avctx, &s->picture);
199 AVCodec ff_sunrast_decoder = {
201 .type = AVMEDIA_TYPE_VIDEO,
202 .id = CODEC_ID_SUNRAST,
203 .priv_data_size = sizeof(SUNRASTContext),
204 .init = sunrast_init,
205 .close = sunrast_end,
206 .decode = sunrast_decode_frame,
207 .capabilities = CODEC_CAP_DR1,
208 .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),