/* * 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)