FFmpeg/libavcodec/sunrast.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

199 lines
5.4 KiB
C

/*
* 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 "libavutil/intreadwrite.h"
#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 av_cold 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, AVPacket *avpkt) {
const uint8_t *buf = avpkt->data;
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_FORMAT_TIFF || 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 = (type == RT_FORMAT_RGB) ? PIX_FMT_RGB24 : 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 av_cold 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",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_SUNRAST,
sizeof(SUNRASTContext),
sunrast_init,
NULL,
sunrast_end,
sunrast_decode_frame,
CODEC_CAP_DR1,
NULL,
.long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
};