139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
#include "mathops.h"
|
|
|
|
static av_cold int xbm_decode_init(AVCodecContext *avctx)
|
|
{
|
|
avctx->coded_frame = avcodec_alloc_frame();
|
|
if (!avctx->coded_frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int convert(uint8_t x)
|
|
{
|
|
if (x >= 'a')
|
|
x -= 87;
|
|
else if (x >= 'A')
|
|
x -= 55;
|
|
else
|
|
x -= '0';
|
|
return x;
|
|
}
|
|
|
|
static int xbm_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
AVFrame *p = avctx->coded_frame;
|
|
const uint8_t *end, *ptr = avpkt->data;
|
|
uint8_t *dst;
|
|
int ret, linesize, i, j;
|
|
|
|
end = avpkt->data + avpkt->size;
|
|
while (!avctx->width || !avctx->height) {
|
|
char name[256];
|
|
int number, len;
|
|
|
|
ptr += strcspn(ptr, "#");
|
|
if (sscanf(ptr, "#define %256s %u", name, &number) != 2) {
|
|
av_log(avctx, AV_LOG_ERROR, "Unexpected preprocessor directive\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
len = strlen(name);
|
|
if ((len > 6) && !avctx->height && !memcmp(name + len - 7, "_height", 7)) {
|
|
avctx->height = number;
|
|
} else if ((len > 5) && !avctx->width && !memcmp(name + len - 6, "_width", 6)) {
|
|
avctx->width = number;
|
|
} else {
|
|
av_log(avctx, AV_LOG_ERROR, "Unknown define '%s'\n", name);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
ptr += strcspn(ptr, "\n\r") + 1;
|
|
}
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
|
|
|
|
if (p->data[0])
|
|
avctx->release_buffer(avctx, p);
|
|
|
|
p->reference = 0;
|
|
if ((ret = ff_get_buffer(avctx, p)) < 0)
|
|
return ret;
|
|
|
|
// goto start of image data
|
|
ptr += strcspn(ptr, "{") + 1;
|
|
|
|
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;
|
|
|
|
ptr += strcspn(ptr, "x") + 1;
|
|
if (ptr < end && isxdigit(*ptr)) {
|
|
val = convert(*ptr);
|
|
ptr++;
|
|
if (isxdigit(*ptr))
|
|
val = (val << 4) + convert(*ptr);
|
|
*dst++ = ff_reverse[val];
|
|
} else {
|
|
av_log(avctx, AV_LOG_ERROR, "Unexpected data at '%.8s'\n", ptr);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
}
|
|
|
|
p->key_frame = 1;
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
|
|
*got_frame = 1;
|
|
*(AVFrame *)data = *p;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int xbm_decode_close(AVCodecContext *avctx)
|
|
{
|
|
if (avctx->coded_frame->data[0])
|
|
avctx->release_buffer(avctx, avctx->coded_frame);
|
|
|
|
av_freep(&avctx->coded_frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_xbm_decoder = {
|
|
.name = "xbm",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_XBM,
|
|
.init = xbm_decode_init,
|
|
.close = xbm_decode_close,
|
|
.decode = xbm_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
|
|
};
|