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47 lines
1.4 KiB
47 lines
1.4 KiB
/* |
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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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