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/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;
36 uint8_t *ptr, *ptr2 = NULL;
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_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 (av_image_check_size(w, h, 0, avctx)) {
65 av_log(avctx, AV_LOG_ERROR, "invalid image size\n");
66 return AVERROR_INVALIDDATA;
68 if (maptype == RMT_RAW) {
69 avpriv_request_sample(avctx, "Unknown colormap type");
70 return AVERROR_PATCHWELCOME;
72 if (maptype > RMT_RAW) {
73 av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
74 return AVERROR_INVALIDDATA;
77 if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF) {
78 av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
84 avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_MONOWHITE;
87 avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_NONE;
90 avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8;
93 avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;
96 avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_0RGB : AV_PIX_FMT_0BGR;
99 av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
100 return AVERROR_INVALIDDATA;
103 if (w != avctx->width || h != avctx->height)
104 avcodec_set_dimensions(avctx, w, h);
105 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
108 p->pict_type = AV_PICTURE_TYPE_I;
110 if (buf_end - buf < maplength)
111 return AVERROR_INVALIDDATA;
113 if (depth > 8 && maplength) {
114 av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
116 } else if (maplength) {
117 unsigned int len = maplength / 3;
119 if (maplength % 3 || maplength > 768) {
120 av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
121 return AVERROR_INVALIDDATA;
125 for (x = 0; x < len; x++, ptr += 4)
126 *(uint32_t *)ptr = (0xFFU<<24) + (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
131 if (maplength && depth < 8) {
132 ptr = ptr2 = av_malloc((w + 15) * h);
134 return AVERROR(ENOMEM);
135 stride = (w + 15 >> 3) * depth;
138 stride = p->linesize[0];
141 /* scanlines are aligned on 16 bit boundaries */
142 len = (depth * w + 7) >> 3;
143 alen = len + (len & 1);
145 if (type == RT_BYTE_ENCODED) {
147 uint8_t *end = ptr + h * stride;
150 while (ptr != end && buf < buf_end) {
152 if (buf_end - buf < 1)
153 return AVERROR_INVALIDDATA;
155 if ((value = *buf++) == RLE_TRIGGER) {
172 for (y = 0; y < h; y++) {
173 if (buf_end - buf < len)
175 memcpy(ptr, buf, len);
180 if (avctx->pix_fmt == AV_PIX_FMT_PAL8 && depth < 8) {
181 uint8_t *ptr_free = ptr2;
183 for (y=0; y<h; y++) {
184 for (x = 0; x < (w + 7 >> 3) * depth; x++) {
186 ptr[8*x] = ptr2[x] >> 7;
187 ptr[8*x+1] = ptr2[x] >> 6 & 1;
188 ptr[8*x+2] = ptr2[x] >> 5 & 1;
189 ptr[8*x+3] = ptr2[x] >> 4 & 1;
190 ptr[8*x+4] = ptr2[x] >> 3 & 1;
191 ptr[8*x+5] = ptr2[x] >> 2 & 1;
192 ptr[8*x+6] = ptr2[x] >> 1 & 1;
193 ptr[8*x+7] = ptr2[x] & 1;
195 ptr[2*x] = ptr2[x] >> 4;
196 ptr[2*x+1] = ptr2[x] & 0xF;
199 ptr += p->linesize[0];
200 ptr2 += (w + 15 >> 3) * depth;
207 return buf - bufstart;
210 AVCodec ff_sunrast_decoder = {
212 .type = AVMEDIA_TYPE_VIDEO,
213 .id = AV_CODEC_ID_SUNRAST,
214 .decode = sunrast_decode_frame,
215 .capabilities = CODEC_CAP_DR1,
216 .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),