mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
def97856de
Express bitfields more simply. Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
123 lines
3.8 KiB
C
123 lines
3.8 KiB
C
/*
|
|
* XBM image format
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/avstring.h"
|
|
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
#include "mathops.h"
|
|
|
|
static int xbm_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
AVFrame *p = data;
|
|
int ret, linesize, i;
|
|
int width = 0;
|
|
int height = 0;
|
|
const uint8_t *ptr = avpkt->data;
|
|
uint8_t *dst;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
|
|
while (!width || !height) {
|
|
ptr += strcspn(ptr, "#");
|
|
if (ptr >= avpkt->data + avpkt->size) {
|
|
av_log(avctx, AV_LOG_ERROR, "End of file reached.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (strncmp(ptr, "#define", 7) != 0) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Unexpected preprocessor directive.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
// skip the name
|
|
ptr += strcspn(ptr, "_") + 1;
|
|
// get width or height
|
|
if (strncmp(ptr, "width", 5) == 0) {
|
|
ptr += strcspn(ptr, " ");
|
|
width = strtol(ptr, NULL, 10);
|
|
} else if (strncmp(ptr, "height", 6) == 0) {
|
|
ptr += strcspn(ptr, " ");
|
|
height = strtol(ptr, NULL, 10);
|
|
} else {
|
|
// skip offset and unknown variables
|
|
av_log(avctx, AV_LOG_VERBOSE,
|
|
"Ignoring preprocessor directive.\n");
|
|
}
|
|
}
|
|
|
|
if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
|
|
return ret;
|
|
|
|
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
|
|
return ret;
|
|
|
|
// go to start of image data
|
|
ptr += strcspn(ptr, "{");
|
|
|
|
linesize = (avctx->width + 7) / 8;
|
|
for (i = 0; i < avctx->height; i++) {
|
|
int eol = 0, e = 0;
|
|
dst = p->data[0] + i * p->linesize[0];
|
|
if (ptr >= avpkt->data + avpkt->size) {
|
|
av_log(avctx, AV_LOG_ERROR, "End of file reached.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
do {
|
|
int val;
|
|
uint8_t *endptr;
|
|
|
|
ptr += strcspn(ptr, "x") - 1; // -1 to get 0x
|
|
val = strtol(ptr, (char **)&endptr, 16);
|
|
|
|
if (endptr - ptr == 4) {
|
|
// XBM X11 format
|
|
*dst++ = ff_reverse[val];
|
|
eol = linesize;
|
|
} else if (endptr - ptr == 6) {
|
|
// XBM X10 format
|
|
*dst++ = ff_reverse[val >> 8];
|
|
*dst++ = ff_reverse[val & 0xFF];
|
|
eol = linesize / 2; // 2 bytes read
|
|
} else {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Unexpected data at %.8s.\n", ptr);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
ptr = endptr;
|
|
} while (++e < eol);
|
|
}
|
|
|
|
p->key_frame = 1;
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
|
|
*got_frame = 1;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
AVCodec ff_xbm_decoder = {
|
|
.name = "xbm",
|
|
.long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_XBM,
|
|
.decode = xbm_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|