| /* |
| * ID3v2 header parser |
| * Copyright (c) 2003 Fabrice Bellard |
| * |
| * 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 "id3v2.h" |
| |
| int ff_id3v2_match(const uint8_t *buf) |
| { |
| return buf[0] == 'I' && |
| buf[1] == 'D' && |
| buf[2] == '3' && |
| buf[3] != 0xff && |
| buf[4] != 0xff && |
| (buf[6] & 0x80) == 0 && |
| (buf[7] & 0x80) == 0 && |
| (buf[8] & 0x80) == 0 && |
| (buf[9] & 0x80) == 0; |
| } |
| |
| int ff_id3v2_tag_len(const uint8_t * buf) |
| { |
| int len = ((buf[6] & 0x7f) << 21) + |
| ((buf[7] & 0x7f) << 14) + |
| ((buf[8] & 0x7f) << 7) + |
| (buf[9] & 0x7f) + |
| ID3v2_HEADER_SIZE; |
| if (buf[5] & 0x10) |
| len += ID3v2_HEADER_SIZE; |
| return len; |
| } |