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https://github.com/nyanmisaka/ffmpeg-rockchip.git
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a78f136f3f
This avoids unnecessary rebuilds of most source files if only the list of enabled components has changed, but not the other properties of the build, set in config.h. Signed-off-by: Martin Storsjö <martin@martin.st>
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/*
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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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