2012-03-23 22:54:09 +00:00
|
|
|
/*
|
|
|
|
* XBM image format
|
|
|
|
*
|
|
|
|
* Copyright (c) 2012 Paul B Mahol
|
|
|
|
*
|
|
|
|
* 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
|
|
|
|
*/
|
|
|
|
|
2014-03-22 04:33:27 +00:00
|
|
|
#include "libavutil/avstring.h"
|
|
|
|
|
2012-03-23 22:54:09 +00:00
|
|
|
#include "avcodec.h"
|
|
|
|
#include "internal.h"
|
2012-10-13 18:00:48 +00:00
|
|
|
#include "mathops.h"
|
2012-03-23 22:54:09 +00:00
|
|
|
|
|
|
|
static int convert(uint8_t x)
|
|
|
|
{
|
|
|
|
if (x >= 'a')
|
|
|
|
x -= 87;
|
|
|
|
else if (x >= 'A')
|
|
|
|
x -= 55;
|
|
|
|
else
|
|
|
|
x -= '0';
|
|
|
|
return x;
|
|
|
|
}
|
|
|
|
|
2014-03-29 02:18:45 +00:00
|
|
|
static int parse_str_int(const uint8_t *p, int len, const uint8_t *key)
|
|
|
|
{
|
|
|
|
const uint8_t *end = p + len;
|
|
|
|
|
|
|
|
for(; p<end - strlen(key); p++) {
|
|
|
|
if (!memcmp(p, key, strlen(key)))
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
p += strlen(key);
|
|
|
|
if (p >= end)
|
|
|
|
return INT_MIN;
|
|
|
|
|
|
|
|
for(; p<end; p++) {
|
|
|
|
char **eptr;
|
|
|
|
int64_t ret = strtol(p, &eptr, 10);
|
|
|
|
if (eptr != p)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
return INT_MIN;
|
|
|
|
}
|
|
|
|
|
2012-03-23 22:54:09 +00:00
|
|
|
static int xbm_decode_frame(AVCodecContext *avctx, void *data,
|
2012-12-05 18:24:43 +00:00
|
|
|
int *got_frame, AVPacket *avpkt)
|
2012-03-23 22:54:09 +00:00
|
|
|
{
|
2013-03-12 02:20:18 +00:00
|
|
|
AVFrame *p = data;
|
2014-03-28 04:23:46 +00:00
|
|
|
int ret, linesize, i, j;
|
2014-03-22 04:33:27 +00:00
|
|
|
int width = 0;
|
|
|
|
int height = 0;
|
2012-03-23 22:54:09 +00:00
|
|
|
const uint8_t *end, *ptr = avpkt->data;
|
2014-03-29 02:18:45 +00:00
|
|
|
const uint8_t *next;
|
2012-03-23 22:54:09 +00:00
|
|
|
uint8_t *dst;
|
|
|
|
|
2014-03-22 04:33:27 +00:00
|
|
|
avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
|
2012-03-23 22:54:09 +00:00
|
|
|
end = avpkt->data + avpkt->size;
|
|
|
|
|
2014-03-29 02:18:45 +00:00
|
|
|
width = parse_str_int(avpkt->data, avpkt->size, "_width");
|
|
|
|
height = parse_str_int(avpkt->data, avpkt->size, "_height");
|
2012-03-23 22:54:09 +00:00
|
|
|
|
2014-03-22 04:33:27 +00:00
|
|
|
if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
|
|
|
|
return ret;
|
|
|
|
|
2013-03-12 02:20:18 +00:00
|
|
|
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
|
2012-03-23 22:54:09 +00:00
|
|
|
return ret;
|
|
|
|
|
2012-04-29 13:56:12 +00:00
|
|
|
// goto start of image data
|
2014-03-29 02:18:45 +00:00
|
|
|
next = ptr + strcspn(ptr, "{");
|
|
|
|
if (!*next)
|
|
|
|
next = ptr + strcspn(ptr, "(");
|
|
|
|
if (!*next)
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
ptr = next + 1;
|
2012-04-29 13:56:12 +00:00
|
|
|
|
2012-03-23 22:54:09 +00:00
|
|
|
linesize = (avctx->width + 7) / 8;
|
|
|
|
for (i = 0; i < avctx->height; i++) {
|
|
|
|
dst = p->data[0] + i * p->linesize[0];
|
|
|
|
for (j = 0; j < linesize; j++) {
|
|
|
|
uint8_t val;
|
|
|
|
|
2014-03-29 02:18:45 +00:00
|
|
|
ptr += strcspn(ptr, "x$") + 1;
|
2013-03-03 10:17:50 +00:00
|
|
|
if (ptr < end && av_isxdigit(*ptr)) {
|
2014-03-28 04:33:13 +00:00
|
|
|
val = convert(*ptr++);
|
2013-03-03 10:17:50 +00:00
|
|
|
if (av_isxdigit(*ptr))
|
2014-03-28 04:33:13 +00:00
|
|
|
val = (val << 4) + convert(*ptr++);
|
2012-10-13 18:00:48 +00:00
|
|
|
*dst++ = ff_reverse[val];
|
2014-03-28 04:34:25 +00:00
|
|
|
if (av_isxdigit(*ptr) && j+1 < linesize) {
|
|
|
|
j++;
|
|
|
|
val = convert(*ptr++);
|
|
|
|
if (av_isxdigit(*ptr))
|
|
|
|
val = (val << 4) + convert(*ptr++);
|
|
|
|
*dst++ = ff_reverse[val];
|
|
|
|
}
|
2012-03-23 22:54:09 +00:00
|
|
|
} else {
|
2014-03-22 04:33:27 +00:00
|
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
|
|
"Unexpected data at %.8s.\n", ptr);
|
2012-03-23 22:54:09 +00:00
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
p->key_frame = 1;
|
|
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
|
|
|
2012-12-05 18:24:43 +00:00
|
|
|
*got_frame = 1;
|
2012-03-23 22:54:09 +00:00
|
|
|
|
|
|
|
return avpkt->size;
|
|
|
|
}
|
|
|
|
|
|
|
|
AVCodec ff_xbm_decoder = {
|
|
|
|
.name = "xbm",
|
2013-10-04 13:33:20 +00:00
|
|
|
.long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
|
2012-03-23 22:54:09 +00:00
|
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
2012-08-07 20:45:46 +00:00
|
|
|
.id = AV_CODEC_ID_XBM,
|
2012-03-23 22:54:09 +00:00
|
|
|
.decode = xbm_decode_frame,
|
|
|
|
.capabilities = CODEC_CAP_DR1,
|
|
|
|
};
|