get_audio.h

音频编码

/*
 *	Get Audio routines include file
 *
 *	Copyright (c) 1999 Albert L Faber
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */


#ifndef LAME_GET_AUDIO_H
#define LAME_GET_AUDIO_H
#include "lame.h"
#include <stdio.h>

typedef enum sound_file_format_e {
  sf_unknown, 
  sf_raw, 
  sf_wave, 
  sf_aiff, 
  sf_mp1,  /* MPEG Layer 1, aka mpg */
  sf_mp2,  /* MPEG Layer 2 */
  sf_mp3,  /* MPEG Layer 3 */
  sf_ogg 
} sound_file_format;




FILE *init_outfile ( char *outPath, int decode );
void init_infile(lame_global_flags *, char *inPath);
void close_infile(void);
int get_audio(lame_global_flags * const gfp, int buffer[2][1152]);
int get_audio16(lame_global_flags * const gfp, short buffer[2][1152]);
int WriteWaveHeader(FILE * const fp, const int pcmbytes,
		    const int freq, const int channels, const int bits);



/* the simple lame decoder */
/* After calling lame_init(), lame_init_params() and
 * init_infile(), call this routine to read the input MP3 file 
 * and output .wav data to the specified file pointer
 * lame_decoder will ignore the first 528 samples, since these samples
 * represent the mpglib decoding delay (and are all 0).  
 *skip = number of additional
 * samples to skip, to (for example) compensate for the encoder delay,
 * only used when decoding mp3 
*/
int lame_decoder(lame_global_flags *gfp,FILE *outf,int skip, char *inPath, char *outPath);



void SwapBytesInWords( short *loc, int words );



#ifdef LIBSNDFILE

#include "sndfile.h"


#else
/*****************************************************************
 * LAME/ISO built in audio file I/O routines 
 *******************************************************************/
#include "portableio.h"


typedef struct  blockAlign_struct {
    unsigned long   offset;
    unsigned long   blockSize;
} blockAlign;

typedef struct  IFF_AIFF_struct {
    short           numChannels;
    unsigned long   numSampleFrames;
    short           sampleSize;
    double          sampleRate;
    unsigned long   sampleType;
    blockAlign      blkAlgn;
} IFF_AIFF;

extern int            aiff_read_headers(FILE*, IFF_AIFF*);
extern int            aiff_seek_to_sound_data(FILE*);
extern int            aiff_write_headers(FILE*, IFF_AIFF*);
extern int parse_wavheader(void);
extern int parse_aiff(const char fn[]);
extern void   aiff_check(const char*, IFF_AIFF*, int*);



#endif	/* ifdef LIBSNDFILE */
#endif	/* ifndef LAME_GET_AUDIO_H */