mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/*
|
|
* XWD parser
|
|
* Copyright (c) 2022 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* XWD parser
|
|
**/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "parser.h"
|
|
#include "xwd.h"
|
|
|
|
typedef struct XWDParseContext {
|
|
ParseContext pc;
|
|
int left;
|
|
int idx;
|
|
uint8_t hdr[XWD_HEADER_SIZE];
|
|
} XWDParseContext;
|
|
|
|
static int xwd_parse(AVCodecParserContext *s, AVCodecContext *avctx,
|
|
const uint8_t **poutbuf, int *poutbuf_size,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
XWDParseContext *t = s->priv_data;
|
|
ParseContext *pc = &t->pc;
|
|
int next = END_NOT_FOUND;
|
|
|
|
s->pict_type = AV_PICTURE_TYPE_NONE;
|
|
|
|
*poutbuf = NULL;
|
|
*poutbuf_size = 0;
|
|
|
|
if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
|
|
next = buf_size;
|
|
} else {
|
|
for (int i = 0; i < buf_size; i++) {
|
|
if (t->left > 0) {
|
|
t->left--;
|
|
if (t->left == 0) {
|
|
next = i;
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (t->idx >= 100) {
|
|
t->idx = 99;
|
|
memmove(&t->hdr[0], &t->hdr[1], XWD_HEADER_SIZE-1);
|
|
}
|
|
|
|
t->hdr[t->idx++] = buf[i];
|
|
|
|
if (t->idx >= 100 && AV_RB32(t->hdr + 4) == XWD_VERSION) {
|
|
uint32_t header_size = AV_RB32(t->hdr + 0);
|
|
uint32_t height = AV_RB32(t->hdr + 20);
|
|
uint32_t lsize = AV_RB32(t->hdr + 48);
|
|
uint32_t ncolors = AV_RB32(t->hdr + 76);
|
|
uint32_t size = header_size + ncolors * XWD_CMAP_SIZE + height * lsize;
|
|
pc->frame_start_found = 1;
|
|
t->left = size - XWD_HEADER_SIZE + 1;
|
|
t->idx = 0;
|
|
memset(t->hdr, 0, sizeof(t->hdr));
|
|
}
|
|
}
|
|
|
|
if (ff_combine_frame(pc, next, &buf, &buf_size) < 0)
|
|
return buf_size;
|
|
}
|
|
|
|
*poutbuf = buf;
|
|
*poutbuf_size = buf_size;
|
|
|
|
s->pict_type = AV_PICTURE_TYPE_I;
|
|
s->key_frame = 1;
|
|
s->duration = 1;
|
|
|
|
return next;
|
|
}
|
|
|
|
const AVCodecParser ff_xwd_parser = {
|
|
.codec_ids = { AV_CODEC_ID_XWD },
|
|
.priv_data_size = sizeof(XWDParseContext),
|
|
.parser_parse = xwd_parse,
|
|
.parser_close = ff_parse_close,
|
|
};
|