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56 lines
1.8 KiB
56 lines
1.8 KiB
/* |
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* MJPEG 2000 Demuxer |
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* Copyright (c) 2016 Ståle Kristoffersen |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "config_components.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "rawdec.h" |
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#if CONFIG_MJPEG_2000_DEMUXER |
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static int mjpeg2000_probe(const AVProbeData *p) |
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{ |
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const uint8_t *b = p->buf; |
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int i, marker, marker_size; |
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int frames = 0, invalid = 0; |
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for (i = 0; i < p->buf_size - 5; i++) { |
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if (AV_RB32(b) == 0xff4fff51){ |
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marker_size = AV_RB16(b+4); |
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if (marker_size + i < p->buf_size - 4) { |
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marker = AV_RB8(b+4+marker_size); |
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if (marker == 0xff) |
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frames++; |
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else |
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invalid++; |
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} |
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} |
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b += 1; |
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} |
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if (invalid*4 + 1 < frames) { |
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if (invalid == 0 && frames > 2) |
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return AVPROBE_SCORE_EXTENSION / 2; |
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return AVPROBE_SCORE_EXTENSION / 4; |
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} |
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return 0; |
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} |
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FF_DEF_RAWVIDEO_DEMUXER2(mjpeg_2000, "raw MJPEG 2000 video", mjpeg2000_probe, "j2k", AV_CODEC_ID_JPEG2000, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS) |
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#endif
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