libmpdemux/mp3_hdr.h

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #ifndef MPLAYER_MP3_HDR_H
  20 #define MPLAYER_MP3_HDR_H
  21
  22 #include <stddef.h>
  23
  24 int mp_get_mp3_header(unsigned char* hbuf,int* chans, int* freq, int* spf, int* mpa_layer, int* br);
  25
  26 #define mp_decode_mp3_header(hbuf)  mp_get_mp3_header(hbuf,NULL,NULL,NULL,NULL,NULL)
  27
  28 static inline int mp_check_mp3_header(unsigned int head){
  29     unsigned char tmp[4] = {head >> 24, head >> 16, head >> 8, head};
  30     if( (head & 0xffe00000) != 0xffe00000 ||
  31         (head & 0x00000c00) == 0x00000c00) return 0;
  32     if(mp_decode_mp3_header(tmp)<=0) return 0;
  33     return 1;
  34 }
  35
  36 #endif /* MPLAYER_MP3_HDR_H */