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libavformat/dnxhddec.c

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00001 /*
00002  * RAW DNxHD (SMPTE VC-3) demuxer
00003  * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@gmail.com>
00004  * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
00005  *
00006  * This file is part of Libav.
00007  *
00008  * Libav is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * Libav is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with Libav; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include "libavutil/intreadwrite.h"
00024 #include "avformat.h"
00025 #include "rawdec.h"
00026 
00027 static int dnxhd_probe(AVProbeData *p)
00028 {
00029     static const uint8_t header[] = {0x00,0x00,0x02,0x80,0x01};
00030     int w, h, compression_id;
00031     if (p->buf_size < 0x2c)
00032         return 0;
00033     if (memcmp(p->buf, header, 5))
00034         return 0;
00035     h = AV_RB16(p->buf + 0x18);
00036     w = AV_RB16(p->buf + 0x1a);
00037     if (!w || !h)
00038         return 0;
00039     compression_id = AV_RB32(p->buf + 0x28);
00040     if (compression_id < 1237 || compression_id > 1253)
00041         return 0;
00042     return AVPROBE_SCORE_MAX;
00043 }
00044 
00045 FF_DEF_RAWVIDEO_DEMUXER(dnxhd, "raw DNxHD (SMPTE VC-3)", dnxhd_probe, NULL, CODEC_ID_DNXHD)
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