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ffmpeg / libavformat / id3v2.c @ 74afdc55

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1 2ea512a6 Alex Converse
/*
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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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}
36 ac3ef4a4 Alex Converse
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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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}