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/**********************************************************
*
* libmp3splt -- library based on mp3splt,
* for mp3/ogg splitting without decoding
*
* Copyright (c) 2002-2005 M. Trotta - <mtrotta@users.sourceforge.net>
* Copyright (c) 2005-2009 Alexandru Munteanu - io_fx@yahoo.fr
*
* http://mp3splt.sourceforge.net
*
*********************************************************/
/**********************************************************
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307,
* USA.
*
*********************************************************/
#ifndef MP3SPLT_MP3_H
#ifndef NO_ID3TAG
#include <id3tag.h>
#endif
#include <mad.h>
#include "splt.h"
/**********************************/
/* Mp3 structures */
#define SPLT_MAD_BSIZE 4032
// Struct that will contain header's useful infos
struct splt_header {
off_t ptr; // Offset of header
int bitrate;
int padding;
int framesize;
};
// Struct that will contains infos on mp3 and an header struct of first valid header
struct splt_mp3 {
int mpgid; // 0 or 1
int layer; // mpg1, mpg2, or mpg3
int channels;
//0 = single channel
//1 = dual channel
//2 = joint stereo
//3 = stereo
//4 = other
//frequency
int freq;
//bitrate
int bitrate;
//frames per second
float fps;
//used for the xing header
int xing;
char *xingbuffer;
off_t xing_offset;
//length of the mp3 file
off_t len;
//where we begin reading
off_t firsth;
struct splt_header firsthead;
};
typedef struct {
FILE *file_input;
struct splt_header h;
//if we are in framemode or not
short framemode;
//total frames
unsigned long frames;
int syncdetect;
off_t end;
off_t end2;
off_t bytes;
int first;
unsigned long headw;
//see the mp3 structure
struct splt_mp3 mp3file;
//used internally, libmad structures
struct mad_stream stream;
struct mad_frame frame;
struct mad_synth synth;
//internally used by the silence detection functions
mad_fixed_t temp_level;
//the offset
float off;
//used internally when reading the file
unsigned char inputBuffer[SPLT_MAD_BSIZE];
//mad timer
mad_timer_t timer;
//used internally, pointer to the beginning of a frame
unsigned char *data_ptr;
//used internally, length of a frame
long data_len;
//length of a buffer when reading a frame
int buf_len;
} splt_mp3_state;
/****************************/
/* mp3 constants */
/*
Frame per second:
Each MPEG1 frame decodes to 1152 PCM
samples, 576 with MPEG2.
32000/1152 = 27.77778 = 16000/576
44100/1152 = 38.28125 = 22050/576
48000/1152 = 41.66667 = 24000/576
*/
#define SPLT_MP3_TAG "TAG"
#define SPLT_MP3_GENRENUM 82
#define SPLT_MP3_PCM 1152
#define SPLT_MP3_BYTE 8
#define SPLT_MP3_XING_MAGIC 0x58696E67
#define SPLT_MP3_INFO_MAGIC 0x496E666F
#define SPLT_MP3_XING_FRAMES 0x00000001L
#define SPLT_MP3_XING_BYTES 0x00000002L
#define SPLT_MP3_ID3_ARTIST 1
#define SPLT_MP3_ID3_ALBUM 2
#define SPLT_MP3_ID3_TITLE 3
#define SPLT_MP3_ID3_YEAR 4
#define SPLT_MP3_ID3_GENRE 5
#define SPLT_MP3_ID3_TRACK 6
#define SPLT_MP3_ID3_COMMENT 7
#define SPLT_MP3_CRCLEN 4
#define SPLT_MP3_ABWINDEXOFFSET 0x539
#define SPLT_MP3_ABWLEN 0x1f5
#define SPLT_MP3_INDEXVERSION 1
#define SPLT_MP3_READBSIZE 1024
#define SPLT_MP3EXT ".mp3"
#define MP3SPLT_MP3_H
#endif
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