3 * Copyright (c) 2015 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/intreadwrite.h"
28 static int dvbsub_probe(AVProbeData *p)
31 const uint8_t *end = p->buf + p->buf_size;
35 for(i=0; i<p->buf_size; i++){
36 if (p->buf[i] == 0x0f) {
37 const uint8_t *ptr = p->buf + i;
38 uint8_t histogram[6] = {0};
40 for(j=0; 6 < end - ptr; j++) {
44 //page_id = AV_RB16(ptr + 2);
45 len = AV_RB16(ptr + 4);
48 } else if (type >= 0x10 && type <= 0x14) {
49 histogram[type - 0x10] ++;
52 if (6 + len > end - ptr)
56 for (k=0; k < 4; k++) {
57 min = FFMIN(min, histogram[k]);
59 if (min && j > max_score)
65 return AVPROBE_SCORE_EXTENSION;
70 FF_DEF_RAWSUB_DEMUXER(dvbsub, "raw dvbsub", dvbsub_probe, NULL, AV_CODEC_ID_DVB_SUBTITLE, AVFMT_GENERIC_INDEX)