mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-23 19:30:05 +00:00
71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
/*
|
|
* RAW dvbsub demuxer
|
|
* Copyright (c) 2015 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* 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/intreadwrite.h"
|
|
|
|
#include "avformat.h"
|
|
#include "rawdec.h"
|
|
|
|
|
|
static int dvbsub_probe(AVProbeData *p)
|
|
{
|
|
int i, j, k;
|
|
const uint8_t *end = p->buf + p->buf_size;
|
|
int type, len;
|
|
int max_score = 0;
|
|
|
|
for(i=0; i<p->buf_size; i++){
|
|
if (p->buf[i] == 0x0f) {
|
|
const uint8_t *ptr = p->buf + i;
|
|
uint8_t histogram[6] = {0};
|
|
int min = 255;
|
|
for(j=0; 6 < end - ptr; j++) {
|
|
if (*ptr != 0x0f)
|
|
break;
|
|
type = ptr[1];
|
|
//page_id = AV_RB16(ptr + 2);
|
|
len = AV_RB16(ptr + 4);
|
|
if (type == 0x80) {
|
|
;
|
|
} else if (type >= 0x10 && type <= 0x14) {
|
|
histogram[type - 0x10] ++;
|
|
} else
|
|
break;
|
|
if (6 + len > end - ptr)
|
|
break;
|
|
ptr += 6 + len;
|
|
}
|
|
for (k=0; k < 4; k++) {
|
|
min = FFMIN(min, histogram[k]);
|
|
}
|
|
if (min && j > max_score)
|
|
max_score = j;
|
|
}
|
|
}
|
|
|
|
if (max_score > 5)
|
|
return AVPROBE_SCORE_EXTENSION;
|
|
|
|
return 0;
|
|
}
|
|
|
|
FF_DEF_RAWSUB_DEMUXER(dvbsub, "raw dvbsub", dvbsub_probe, NULL, AV_CODEC_ID_DVB_SUBTITLE, AVFMT_GENERIC_INDEX)
|