audio.h

用JAVA写的MP3,MP2,MP1解码源代码

/* 
 * Audio 'LIB' defines
 */

enum { AUDIO_OUT_HEADPHONES,AUDIO_OUT_INTERNAL_SPEAKER,AUDIO_OUT_LINE_OUT };
enum { DECODE_TEST, DECODE_AUDIO, DECODE_STDOUT, DECODE_BUFFER };

#define AUDIO_FORMAT_MASK	  0x100
#define AUDIO_FORMAT_16		  0x100
#define AUDIO_FORMAT_8		  0x000

#define AUDIO_FORMAT_SIGNED_16    0x110
#define AUDIO_FORMAT_UNSIGNED_16  0x120
#define AUDIO_FORMAT_UNSIGNED_8   0x1
#define AUDIO_FORMAT_SIGNED_8     0x2
#define AUDIO_FORMAT_ULAW_8       0x4
#define AUDIO_FORMAT_ALAW_8       0x8

/* 3% rate tolerance */
#define AUDIO_RATE_TOLERANCE	  3

#ifdef SGI
#include <audio.h>
#endif

struct parameter {
  int verbose;
  int outmode;
  int force_rate;
  int force_8bit;
  int force_mono;
  int force_stereo;
};

extern struct parameter param;

struct audio_info_struct
{
  int fn; /* filenumber */
#ifdef SGI
  ALconfig config;
  ALport port;
#endif
  long rate;
  int gain;
  int output;
  char *device;
  int channels;
  int format;
  int private1;
  void *private2;
};

struct audio_name {
  int  val;
  char *name;
  char *sname;
};

extern void audio_capabilities(struct audio_info_struct *);
extern void audio_fit_capabilities(struct audio_info_struct *ai,int c,int r);

extern char *audio_encoding_name(int format);

extern int audio_play_samples(struct audio_info_struct *,unsigned char *,int);
extern int audio_open(struct audio_info_struct *);
extern int audio_reset_parameters(struct audio_info_struct *);
extern int audio_rate_best_match(struct audio_info_struct *ai);
extern int audio_set_rate(struct audio_info_struct *);
extern int audio_set_format(struct audio_info_struct *);
extern int audio_get_formats(struct audio_info_struct *);
extern int audio_set_channels(struct audio_info_struct *);
extern int audio_write_sample(struct audio_info_struct *,short *,int);
extern int audio_close(struct audio_info_struct *);
extern void audio_info_struct_init(struct audio_info_struct *);
#if defined(SOLARIS) || defined(__NetBSD__)
extern void audio_queueflush(struct audio_info_struct *ai);
#endif