diff options
Diffstat (limited to 'libavformat/mj2kdec.c')
-rw-r--r-- | libavformat/mj2kdec.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/libavformat/mj2kdec.c b/libavformat/mj2kdec.c new file mode 100644 index 0000000..1fb9409 --- /dev/null +++ b/libavformat/mj2kdec.c @@ -0,0 +1,54 @@ +/* + * 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(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 |