blob: 3d2f704c494e2415e88a869cf2b97171e6286d40
| 1 | /* |
| 2 | * RAW dvbsub demuxer |
| 3 | * Copyright (c) 2015 Michael Niedermayer <michaelni@gmx.at> |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 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. |
| 11 | * |
| 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. |
| 16 | * |
| 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 |
| 20 | */ |
| 21 | |
| 22 | #include "libavutil/intreadwrite.h" |
| 23 | |
| 24 | #include "avformat.h" |
| 25 | #include "rawdec.h" |
| 26 | |
| 27 | |
| 28 | static int dvbsub_probe(AVProbeData *p) |
| 29 | { |
| 30 | int i, j, k; |
| 31 | const uint8_t *end = p->buf + p->buf_size; |
| 32 | int type, len; |
| 33 | int max_score = 0; |
| 34 | |
| 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}; |
| 39 | int min = 255; |
| 40 | for(j=0; 6 < end - ptr; j++) { |
| 41 | if (*ptr != 0x0f) |
| 42 | break; |
| 43 | type = ptr[1]; |
| 44 | //page_id = AV_RB16(ptr + 2); |
| 45 | len = AV_RB16(ptr + 4); |
| 46 | if (type == 0x80) { |
| 47 | ; |
| 48 | } else if (type >= 0x10 && type <= 0x14) { |
| 49 | histogram[type - 0x10] ++; |
| 50 | } else |
| 51 | break; |
| 52 | if (6 + len > end - ptr) |
| 53 | break; |
| 54 | ptr += 6 + len; |
| 55 | } |
| 56 | for (k=0; k < 4; k++) { |
| 57 | min = FFMIN(min, histogram[k]); |
| 58 | } |
| 59 | if (min && j > max_score) |
| 60 | max_score = j; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | if (max_score > 5) |
| 65 | return AVPROBE_SCORE_EXTENSION; |
| 66 | |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | FF_DEF_RAWSUB_DEMUXER(dvbsub, "raw dvbsub", dvbsub_probe, NULL, AV_CODEC_ID_DVB_SUBTITLE, AVFMT_GENERIC_INDEX) |
| 71 |