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 typedef struct SUNRASTContext {
33 static av_cold int sunrast_init(AVCodecContext *avctx) {
34 SUNRASTContext *s = avctx->priv_data;
36 avcodec_get_frame_defaults(&s->picture);
37 avctx->coded_frame = &s->picture;
42 static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
43 int *got_frame, AVPacket *avpkt)
45 const uint8_t *buf = avpkt->data;
46 const uint8_t *buf_end = avpkt->data + avpkt->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;
51 uint8_t *ptr, *ptr2 = NULL;
52 const uint8_t *bufstart = buf;
56 return AVERROR_INVALIDDATA;
58 if (AV_RB32(buf) != RAS_MAGIC) {
59 av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
60 return AVERROR_INVALIDDATA;
65 depth = AV_RB32(buf + 12);
66 type = AV_RB32(buf + 20);
67 maptype = AV_RB32(buf + 24);
68 maplength = AV_RB32(buf + 28);
71 if (type == RT_EXPERIMENTAL) {
72 av_log_ask_for_sample(avctx, "unsupported (compression) type\n");
73 return AVERROR_PATCHWELCOME;
75 if (type > RT_FORMAT_IFF) {
76 av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
77 return AVERROR_INVALIDDATA;
79 if (av_image_check_size(w, h, 0, avctx)) {
80 av_log(avctx, AV_LOG_ERROR, "invalid image size\n");
81 return AVERROR_INVALIDDATA;
83 if (maptype == RMT_RAW) {
84 av_log_ask_for_sample(avctx, "unsupported colormap type\n");
85 return AVERROR_PATCHWELCOME;
87 if (maptype > RMT_RAW) {
88 av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
89 return AVERROR_INVALIDDATA;
92 if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF) {
93 av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
99 avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_MONOWHITE;
102 avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_NONE;
105 avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8;
108 avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;
111 avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_0RGB : AV_PIX_FMT_0BGR;
114 av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
115 return AVERROR_INVALIDDATA;
119 avctx->release_buffer(avctx, p);
121 if (w != avctx->width || h != avctx->height)
122 avcodec_set_dimensions(avctx, w, h);
123 if ((ret = ff_get_buffer(avctx, p)) < 0) {
124 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
128 p->pict_type = AV_PICTURE_TYPE_I;
130 if (buf_end - buf < maplength)
131 return AVERROR_INVALIDDATA;
133 if (depth > 8 && maplength) {
134 av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
136 } else if (maplength) {
137 unsigned int len = maplength / 3;
139 if (maplength % 3 || maplength > 768) {
140 av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
141 return AVERROR_INVALIDDATA;
145 for (x = 0; x < len; x++, ptr += 4)
146 *(uint32_t *)ptr = (0xFFU<<24) + (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
151 if (maplength && depth < 8) {
152 ptr = ptr2 = av_malloc((w + 15) * h);
154 return AVERROR(ENOMEM);
155 stride = (w + 15 >> 3) * depth;
158 stride = p->linesize[0];
161 /* scanlines are aligned on 16 bit boundaries */
162 len = (depth * w + 7) >> 3;
163 alen = len + (len & 1);
165 if (type == RT_BYTE_ENCODED) {
167 uint8_t *end = ptr + h * stride;
170 while (ptr != end && buf < buf_end) {
172 if (buf_end - buf < 1)
173 return AVERROR_INVALIDDATA;
175 if ((value = *buf++) == RLE_TRIGGER) {
192 for (y = 0; y < h; y++) {
193 if (buf_end - buf < len)
195 memcpy(ptr, buf, len);
200 if (avctx->pix_fmt == AV_PIX_FMT_PAL8 && depth < 8) {
201 uint8_t *ptr_free = ptr2;
203 for (y=0; y<h; y++) {
204 for (x = 0; x < (w + 7 >> 3) * depth; x++) {
206 ptr[8*x] = ptr2[x] >> 7;
207 ptr[8*x+1] = ptr2[x] >> 6 & 1;
208 ptr[8*x+2] = ptr2[x] >> 5 & 1;
209 ptr[8*x+3] = ptr2[x] >> 4 & 1;
210 ptr[8*x+4] = ptr2[x] >> 3 & 1;
211 ptr[8*x+5] = ptr2[x] >> 2 & 1;
212 ptr[8*x+6] = ptr2[x] >> 1 & 1;
213 ptr[8*x+7] = ptr2[x] & 1;
215 ptr[2*x] = ptr2[x] >> 4;
216 ptr[2*x+1] = ptr2[x] & 0xF;
219 ptr += p->linesize[0];
220 ptr2 += (w + 15 >> 3) * depth;
225 *picture = s->picture;
228 return buf - bufstart;
231 static av_cold int sunrast_end(AVCodecContext *avctx) {
232 SUNRASTContext *s = avctx->priv_data;
234 if(s->picture.data[0])
235 avctx->release_buffer(avctx, &s->picture);
240 AVCodec ff_sunrast_decoder = {
242 .type = AVMEDIA_TYPE_VIDEO,
243 .id = AV_CODEC_ID_SUNRAST,
244 .priv_data_size = sizeof(SUNRASTContext),
245 .init = sunrast_init,
246 .close = sunrast_end,
247 .decode = sunrast_decode_frame,
248 .capabilities = CODEC_CAP_DR1,
249 .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),