src/mp3_header.h

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00001 // -*- C++ -*-
00002 // $Id: mp3_header.h,v 1.4 2002/11/02 17:48:51 t1mpy Exp $
00003 
00004 // id3lib: a C++ library for creating and manipulating id3v1/v2 tags
00005 // Copyright 2002 Thijmen Klok (thijmen@id3lib.org)
00006 
00007 // This library is free software; you can redistribute it and/or modify it
00008 // under the terms of the GNU Library General Public License as published by
00009 // the Free Software Foundation; either version 2 of the License, or (at your
00010 // option) any later version.
00011 //
00012 // This library is distributed in the hope that it will be useful, but WITHOUT
00013 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00014 // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00015 // License for more details.
00016 //
00017 // You should have received a copy of the GNU Library General Public License
00018 // along with this library; if not, write to the Free Software Foundation,
00019 // Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00020 
00021 // The id3lib authors encourage improvements and optimisations to be sent to
00022 // the id3lib coordinator.  Please see the README file for details on where to
00023 // send such submissions.  See the AUTHORS file for a list of people who have
00024 // contributed to id3lib.  See the ChangeLog file for a list of changes to
00025 // id3lib.  These files are distributed with id3lib at
00026 // http://download.sourceforge.net/id3lib/
00027 
00028 #ifndef _MP3_HEADER_H_
00029 #define _MP3_HEADER_H_
00030 
00031 #include "io_decorators.h" //has "readers.h" "io_helpers.h" "utils.h"
00032 
00033 class Mp3Info
00034 {
00035 public:
00036   Mp3Info() { _mp3_header_output = new Mp3_Headerinfo; };
00037   ~Mp3Info() { this->Clean(); };
00038   void Clean();
00039 
00040   const Mp3_Headerinfo* GetMp3HeaderInfo() const { return _mp3_header_output; };
00041   bool Parse(ID3_Reader&, size_t mp3size);
00042 
00043   Mpeg_Layers Layer() const { return _mp3_header_output->layer; };
00044   Mpeg_Version Version() const { return _mp3_header_output->version; };
00045   MP3_BitRates Bitrate() const { return _mp3_header_output->bitrate; };
00046   Mp3_ChannelMode ChannelMode() const { return _mp3_header_output->channelmode; };
00047   Mp3_ModeExt ModeExt() const { return _mp3_header_output->modeext; };
00048   Mp3_Emphasis Emphasis() const { return _mp3_header_output->emphasis; };
00049   Mp3_Crc Crc() const { return _mp3_header_output->crc; };
00050   uint32 VbrBitrate() const { return _mp3_header_output->vbr_bitrate; };
00051   uint32 Frequency() const { return _mp3_header_output->frequency; };
00052   uint32 Framesize() const { return _mp3_header_output->framesize; };
00053   uint32 Frames() const { return _mp3_header_output->frames; };
00054   bool Private() const { return _mp3_header_output->privatebit; };
00055   bool Copyrighted() const { return _mp3_header_output->copyrighted; };
00056   bool Original() const { return _mp3_header_output->original; };
00057   uint32 Seconds() const { return _mp3_header_output->time; };
00058 
00059 private:
00060 
00061   struct _mp3_header_internal //http://www.mp3-tech.org/programmer/frame_header.html
00062   {
00063 //byte 1
00064     unsigned char frame_sync_a : 8; /* all bits should be set */
00065 //byte 2
00066     unsigned char protection_bit : 1;
00067     unsigned char layer : 2;
00068     unsigned char id : 2;
00069     unsigned char frame_sync_b : 3; /* all bits should be set */
00070 //byte 3
00071     unsigned char private_bit : 1;
00072     unsigned char padding_bit : 1;
00073     unsigned char frequency : 2;
00074     unsigned char bitrate_index : 4;
00075 //byte 4
00076     unsigned char emphasis : 2;
00077     unsigned char original : 1;
00078     unsigned char copyright : 1;
00079     unsigned char mode_ext : 2;//only used in joint stereo
00080     unsigned char mode : 2;
00081   };
00082 
00083   Mp3_Headerinfo* _mp3_header_output;
00084 }; //Info
00085 
00086 #endif /* _MP3_HEADER_H_ */
00087 

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