blob: 1fb94094cc2c703ad0ecd5a2e9ec9ccdc05cd106
| 1 | /* |
| 2 | * MJPEG 2000 Demuxer |
| 3 | * Copyright (c) 2016 Ståle Kristoffersen |
| 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 | #include "avformat.h" |
| 24 | #include "rawdec.h" |
| 25 | |
| 26 | #if CONFIG_MJPEG_2000_DEMUXER |
| 27 | static int mjpeg2000_probe(AVProbeData *p) |
| 28 | { |
| 29 | const uint8_t *b = p->buf; |
| 30 | int i, marker, marker_size; |
| 31 | int frames = 0, invalid = 0; |
| 32 | |
| 33 | for (i = 0; i < p->buf_size - 5; i++) { |
| 34 | if (AV_RB32(b) == 0xff4fff51){ |
| 35 | marker_size = AV_RB16(b+4); |
| 36 | if (marker_size + i < p->buf_size - 4) { |
| 37 | marker = AV_RB8(b+4+marker_size); |
| 38 | if (marker == 0xff) |
| 39 | frames++; |
| 40 | else |
| 41 | invalid++; |
| 42 | } |
| 43 | } |
| 44 | b += 1; |
| 45 | } |
| 46 | if (invalid*4 + 1 < frames) { |
| 47 | if (invalid == 0 && frames > 2) |
| 48 | return AVPROBE_SCORE_EXTENSION / 2; |
| 49 | return AVPROBE_SCORE_EXTENSION / 4; |
| 50 | } |
| 51 | return 0; |
| 52 | } |
| 53 | FF_DEF_RAWVIDEO_DEMUXER2(mjpeg_2000, "raw MJPEG 2000 video", mjpeg2000_probe, "j2k", AV_CODEC_ID_JPEG2000, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS) |
| 54 | #endif |
| 55 |