| /* |
| * 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) |
