70 lines
2.1 KiB
C
Executable file
70 lines
2.1 KiB
C
Executable file
/*
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* RAW dvbsub demuxer
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* Copyright (c) 2015 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "rawdec.h"
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static int dvbsub_probe(const AVProbeData *p)
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{
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int i, j, k;
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const uint8_t *end = p->buf + p->buf_size;
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int type, len;
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int max_score = 0;
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for(i=0; i<p->buf_size; i++){
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if (p->buf[i] == 0x0f) {
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const uint8_t *ptr = p->buf + i;
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uint8_t histogram[6] = {0};
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int min = 255;
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for(j=0; 6 < end - ptr; j++) {
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if (*ptr != 0x0f)
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break;
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type = ptr[1];
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//page_id = AV_RB16(ptr + 2);
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len = AV_RB16(ptr + 4);
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if (type == 0x80) {
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;
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} else if (type >= 0x10 && type <= 0x14) {
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histogram[type - 0x10] ++;
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} else
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break;
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if (6 + len > end - ptr)
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break;
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ptr += 6 + len;
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}
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for (k=0; k < 4; k++) {
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min = FFMIN(min, histogram[k]);
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}
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if (min && j > max_score)
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max_score = j;
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}
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}
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if (max_score > 5)
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return AVPROBE_SCORE_EXTENSION;
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return 0;
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}
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FF_DEF_RAWSUB_DEMUXER(dvbsub, "raw dvbsub", dvbsub_probe, NULL, AV_CODEC_ID_DVB_SUBTITLE, AVFMT_GENERIC_INDEX)
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