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http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-January/059302.html Originally committed as revision 16688 to svn://svn.ffmpeg.org/ffmpeg/trunk
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/*
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* ID3v2 header parser
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* Copyright (c) 2003 Fabrice Bellard
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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 "id3v2.h"
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int ff_id3v2_match(const uint8_t *buf)
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{
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return buf[0] == 'I' &&
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buf[1] == 'D' &&
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buf[2] == '3' &&
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buf[3] != 0xff &&
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buf[4] != 0xff &&
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(buf[6] & 0x80) == 0 &&
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(buf[7] & 0x80) == 0 &&
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(buf[8] & 0x80) == 0 &&
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(buf[9] & 0x80) == 0;
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}
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int ff_id3v2_tag_len(const uint8_t * buf)
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{
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int len = ((buf[6] & 0x7f) << 21) +
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((buf[7] & 0x7f) << 14) +
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((buf[8] & 0x7f) << 7) +
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(buf[9] & 0x7f) +
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ID3v2_HEADER_SIZE;
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if (buf[5] & 0x10)
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len += ID3v2_HEADER_SIZE;
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return len;
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}
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