mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 11342 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Ivo van Poorten
17 years ago
parent
7ecc634e8a
commit
d43df959d7
5 changed files with 206 additions and 0 deletions
@ -0,0 +1,196 @@ |
||||
/*
|
||||
* 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, 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, *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; |
||||
} |
||||
|
||||
av_log(avctx, AV_LOG_DEBUG, "maplength %u\n", len); |
||||
|
||||
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 |
||||
}; |
||||
Loading…
Reference in new issue