| /* |
| * MJPEG 2000 Demuxer |
| * Copyright (c) 2016 Ståle Kristoffersen |
| * |
| * 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" |
| |
| #if CONFIG_MJPEG_2000_DEMUXER |
| static int mjpeg2000_probe(const AVProbeData *p) |
| { |
| const uint8_t *b = p->buf; |
| int i, marker, marker_size; |
| int frames = 0, invalid = 0; |
| |
| for (i = 0; i < p->buf_size - 5; i++) { |
| if (AV_RB32(b) == 0xff4fff51){ |
| marker_size = AV_RB16(b+4); |
| if (marker_size + i < p->buf_size - 4) { |
| marker = AV_RB8(b+4+marker_size); |
| if (marker == 0xff) |
| frames++; |
| else |
| invalid++; |
| } |
| } |
| b += 1; |
| } |
| if (invalid*4 + 1 < frames) { |
| if (invalid == 0 && frames > 2) |
| return AVPROBE_SCORE_EXTENSION / 2; |
| return AVPROBE_SCORE_EXTENSION / 4; |
| } |
| return 0; |
| } |
| FF_DEF_RAWVIDEO_DEMUXER2(mjpeg_2000, "raw MJPEG 2000 video", mjpeg2000_probe, "j2k", AV_CODEC_ID_JPEG2000, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS) |
| #endif |
