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/common.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/imgutils.h"
29 static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
30 int *got_frame, AVPacket *avpkt)
32 const uint8_t *buf = avpkt->data;
33 const uint8_t *buf_end = avpkt->data + avpkt->size;
34 AVFrame * const p = data;
35 unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
37 const uint8_t *bufstart = buf;
41 return AVERROR_INVALIDDATA;
43 if (AV_RB32(buf) != RAS_MAGIC) {
44 av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
45 return AVERROR_INVALIDDATA;
50 depth = AV_RB32(buf + 12);
51 type = AV_RB32(buf + 20);
52 maptype = AV_RB32(buf + 24);
53 maplength = AV_RB32(buf + 28);
56 if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF || type == RT_EXPERIMENTAL) {
57 avpriv_request_sample(avctx, "TIFF/IFF/EXPERIMENTAL (compression) type");
58 return AVERROR_PATCHWELCOME;
60 if (type > RT_FORMAT_IFF) {
61 av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
62 return AVERROR_INVALIDDATA;
64 if (maptype == RMT_RAW) {
65 avpriv_request_sample(avctx, "Unknown colormap type");
66 return AVERROR_PATCHWELCOME;
68 if (maptype > RMT_RAW) {
69 av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
70 return AVERROR_INVALIDDATA;
76 avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
79 avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8;
82 avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;
85 av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
86 return AVERROR_INVALIDDATA;
89 ret = ff_set_dimensions(avctx, w, h);
93 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
94 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
98 p->pict_type = AV_PICTURE_TYPE_I;
100 if (buf_end - buf < maplength)
101 return AVERROR_INVALIDDATA;
103 if (depth != 8 && maplength) {
104 av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
106 } else if (maplength) {
107 unsigned int len = maplength / 3;
109 if (maplength % 3 || maplength > 768) {
110 av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
111 return AVERROR_INVALIDDATA;
115 for (x = 0; x < len; x++, ptr += 4)
116 *(uint32_t *)ptr = (buf[x] << 16) + (buf[len + x] << 8) + buf[len + len + x];
122 stride = p->linesize[0];
124 /* scanlines are aligned on 16 bit boundaries */
125 len = (depth * w + 7) >> 3;
126 alen = len + (len & 1);
128 if (type == RT_BYTE_ENCODED) {
130 uint8_t *end = ptr + h * stride;
133 while (ptr != end && buf < buf_end) {
135 if (buf_end - buf < 1)
136 return AVERROR_INVALIDDATA;
138 if ((value = *buf++) == RLE_TRIGGER) {
155 for (y = 0; y < h; y++) {
156 if (buf_end - buf < len)
158 memcpy(ptr, buf, len);
166 return buf - bufstart;
169 AVCodec ff_sunrast_decoder = {
171 .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
172 .type = AVMEDIA_TYPE_VIDEO,
173 .id = AV_CODEC_ID_SUNRAST,
174 .decode = sunrast_decode_frame,
175 .capabilities = AV_CODEC_CAP_DR1,