mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-23 03:09:51 +00:00
3b0fb00990
Signed-off-by: cyberbox <468042667@qq.com> Change-Id: I63cc2a8c9ff6197c67d6b6b47c124882ad942a22
148 lines
4.0 KiB
C
148 lines
4.0 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 "libavutil/avstring.h"
|
|
#include "libavutil/reverse.h"
|
|
|
|
#include "avcodec.h"
|
|
#include "codec_internal.h"
|
|
#include "internal.h"
|
|
#include "mathops.h"
|
|
|
|
static int get_nibble(uint8_t x)
|
|
{
|
|
int ret = 255;
|
|
|
|
if (x <= '9') {
|
|
if (x >= '0')
|
|
ret = x - '0';
|
|
} else if (x >= 'a') {
|
|
if (x <= 'f')
|
|
ret = x - ('a' - 10);
|
|
} else if (x >= 'A' && x <= 'F')
|
|
ret = x - ('A' - 10);
|
|
return ret;
|
|
}
|
|
|
|
static int parse_str_int(const uint8_t *p, const uint8_t *end, const uint8_t *key)
|
|
{
|
|
int keylen = strlen(key);
|
|
const uint8_t *e = end - keylen;
|
|
|
|
for(; p < e; p++) {
|
|
if (!memcmp(p, key, keylen))
|
|
break;
|
|
}
|
|
p += keylen;
|
|
if (p >= end)
|
|
return INT_MIN;
|
|
|
|
for(; p<end; p++) {
|
|
char *eptr;
|
|
int64_t ret = strtol(p, &eptr, 10);
|
|
if ((const uint8_t *)eptr != p)
|
|
return ret;
|
|
}
|
|
return INT_MIN;
|
|
}
|
|
|
|
static int xbm_decode_frame(AVCodecContext *avctx, AVFrame *p,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
int ret, linesize, i, j;
|
|
int width = 0;
|
|
int height = 0;
|
|
const uint8_t *end, *ptr = avpkt->data;
|
|
const uint8_t *next;
|
|
uint8_t *dst;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
|
|
end = avpkt->data + avpkt->size;
|
|
|
|
width = parse_str_int(avpkt->data, end, "_width");
|
|
height = parse_str_int(avpkt->data, end, "_height");
|
|
|
|
if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
|
|
return ret;
|
|
|
|
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
|
|
return ret;
|
|
|
|
// goto start of image data
|
|
next = memchr(ptr, '{', avpkt->size);
|
|
if (!next)
|
|
next = memchr(ptr, '(', avpkt->size);
|
|
if (!next)
|
|
return AVERROR_INVALIDDATA;
|
|
ptr = next + 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 nib, val;
|
|
|
|
while (ptr < end && *ptr != 'x' && *ptr != '$')
|
|
ptr++;
|
|
|
|
ptr ++;
|
|
if (ptr < end && (val = get_nibble(*ptr)) <= 15) {
|
|
ptr++;
|
|
if ((nib = get_nibble(*ptr)) <= 15) {
|
|
val = (val << 4) + nib;
|
|
ptr++;
|
|
}
|
|
*dst++ = ff_reverse[val];
|
|
if ((val = get_nibble(*ptr)) <= 15 && j+1 < linesize) {
|
|
j++;
|
|
ptr++;
|
|
if ((nib = get_nibble(*ptr)) <= 15) {
|
|
val = (val << 4) + nib;
|
|
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;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
const FFCodec ff_xbm_decoder = {
|
|
.p.name = "xbm",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_XBM,
|
|
.p.capabilities = AV_CODEC_CAP_DR1,
|
|
FF_CODEC_DECODE_CB(xbm_decode_frame),
|
|
};
|