106 lines
2.7 KiB
C
Executable file
106 lines
2.7 KiB
C
Executable file
/*
|
|
* XBM parser
|
|
* Copyright (c) 2021 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
|
|
* XBM parser
|
|
*/
|
|
|
|
#include "libavutil/common.h"
|
|
|
|
#include "parser.h"
|
|
|
|
typedef struct XBMParseContext {
|
|
ParseContext pc;
|
|
uint16_t state16;
|
|
int count;
|
|
} XBMParseContext;
|
|
|
|
#define KEY (((uint64_t)'\n' << 56) | ((uint64_t)'#' << 48) | \
|
|
((uint64_t)'d' << 40) | ((uint64_t)'e' << 32) | \
|
|
((uint64_t)'f' << 24) | ('i' << 16) | ('n' << 8) | \
|
|
('e' << 0))
|
|
|
|
#define END ((';' << 8) | ('\n' << 0))
|
|
|
|
static int xbm_init(AVCodecParserContext *s)
|
|
{
|
|
XBMParseContext *bpc = s->priv_data;
|
|
|
|
bpc->count = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xbm_parse(AVCodecParserContext *s, AVCodecContext *avctx,
|
|
const uint8_t **poutbuf, int *poutbuf_size,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
XBMParseContext *bpc = s->priv_data;
|
|
uint64_t state = bpc->pc.state64;
|
|
uint16_t state16 = bpc->state16;
|
|
int next = END_NOT_FOUND, i = 0;
|
|
|
|
s->pict_type = AV_PICTURE_TYPE_I;
|
|
s->key_frame = 1;
|
|
s->duration = 1;
|
|
|
|
*poutbuf_size = 0;
|
|
*poutbuf = NULL;
|
|
|
|
for (; i < buf_size; i++) {
|
|
state = (state << 8) | buf[i];
|
|
state16 = (state16 << 8) | buf[i];
|
|
|
|
if (state == KEY)
|
|
bpc->count++;
|
|
|
|
if ((state == KEY && bpc->count == 1)) {
|
|
next = i - 6;
|
|
break;
|
|
} else if (state16 == END) {
|
|
next = i + 1;
|
|
bpc->count = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
bpc->pc.state64 = state;
|
|
bpc->state16 = state16;
|
|
if (ff_combine_frame(&bpc->pc, next, &buf, &buf_size) < 0) {
|
|
*poutbuf = NULL;
|
|
*poutbuf_size = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
*poutbuf = buf;
|
|
*poutbuf_size = buf_size;
|
|
|
|
return next;
|
|
}
|
|
|
|
AVCodecParser ff_xbm_parser = {
|
|
.codec_ids = { AV_CODEC_ID_XBM },
|
|
.priv_data_size = sizeof(XBMParseContext),
|
|
.parser_init = xbm_init,
|
|
.parser_parse = xbm_parse,
|
|
.parser_close = ff_parse_close,
|
|
};
|