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/*
* Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder
* Copyright (c) 2007, 2008 Ivo van Poorten
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#define RT_OLD 0
#define RT_STANDARD 1
#define RT_BYTE_ENCODED 2
#define RT_FORMAT_RGB 3
#define RT_FORMAT_TIFF 4
#define RT_FORMAT_IFF 5
typedef struct SUNRASTContext {
AVFrame picture;
} SUNRASTContext;
static int sunrast_init(AVCodecContext *avctx) {
SUNRASTContext *s = avctx->priv_data;
avcodec_get_frame_defaults(&s->picture);
avctx->coded_frame= &s->picture;
return 0;
}
static int sunrast_decode_frame(AVCodecContext *avctx, void *data,
int *data_size, const uint8_t *buf, int buf_size) {
SUNRASTContext * const s = avctx->priv_data;
AVFrame *picture = data;
AVFrame * const p = &s->picture;
unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;
uint8_t *ptr;
const uint8_t *bufstart = buf;
if (AV_RB32(buf) != 0x59a66a95) {
av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
return -1;
}
w = AV_RB32(buf+4);
h = AV_RB32(buf+8);
depth = AV_RB32(buf+12);
type = AV_RB32(buf+20);
maptype = AV_RB32(buf+24);
maplength = AV_RB32(buf+28);
if (type > RT_BYTE_ENCODED && type <= RT_FORMAT_IFF) {
av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
return -1;
}
if (type > RT_FORMAT_IFF) {
av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");
return -1;
}
if (maptype & ~1) {
av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
return -1;
}
buf += 32;
switch (depth) {
case 1:
avctx->pix_fmt = PIX_FMT_MONOWHITE;
break;
case 8:
avctx->pix_fmt = PIX_FMT_PAL8;
break;
case 24:
avctx->pix_fmt = PIX_FMT_BGR24;
break;
default:
av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
return -1;
}
if (p->data[0])
avctx->release_buffer(avctx, p);
if (avcodec_check_dimensions(avctx, w, h))
return -1;
if (w != avctx->width || h != avctx->height)
avcodec_set_dimensions(avctx, w, h);
if (avctx->get_buffer(avctx, p) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
p->pict_type = FF_I_TYPE;
if (depth != 8 && maplength) {
av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
} else if (depth == 8) {
unsigned int len = maplength / 3;
if (!maplength) {
av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
return -1;
}
if (maplength % 3 || maplength > 768) {
av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
return -1;
}
ptr = p->data[1];
for (x=0; x<len; x++, ptr+=4)
*(uint32_t *)ptr = (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];
}
buf += maplength;
ptr = p->data[0];
stride = p->linesize[0];
/* scanlines are aligned on 16 bit boundaries */
len = (depth * w + 7) >> 3;
alen = len + (len&1);
if (type == RT_BYTE_ENCODED) {
int value, run;
uint8_t *end = ptr + h*stride;
x = 0;
while (ptr != end) {
run = 1;
if ((value = *buf++) == 0x80) {
run = *buf++ + 1;
if (run != 1)
value = *buf++;
}
while (run--) {
if (x < len)
ptr[x] = value;
if (++x >= alen) {
x = 0;
ptr += stride;
if (ptr == end)
break;
}
}
}
} else {
for (y=0; y<h; y++) {
memcpy(ptr, buf, len);
ptr += stride;
buf += alen;
}
}
*picture = s->picture;
*data_size = sizeof(AVFrame);
return buf - bufstart;
}
static int sunrast_end(AVCodecContext *avctx) {
SUNRASTContext *s = avctx->priv_data;
if(s->picture.data[0])
avctx->release_buffer(avctx, &s->picture);
return 0;
}
AVCodec sunrast_decoder = {
"sunrast",
CODEC_TYPE_VIDEO,
CODEC_ID_SUNRAST,
sizeof(SUNRASTContext),
sunrast_init,
NULL,
sunrast_end,
sunrast_decode_frame,
0,
NULL
};
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