audio.h

代码有点长,需细心阅读,仅供影音视听类产品的开发人员参考

#ifndef	AUDIO_H
#define AUDIO_H

int     init_audio(void);

//int reset_audio(void);
void    au_main(void);
void    mp3_main(void);

enum
{
	AUD_CMD_VOL_L = 0x01,					/* left-channel-vol 0-255 */
	AUD_CMD_VOL_R,								/* right-channel-vol 0-255  */
	AUD_CMD_CHANNEL = 0x10,				/* channel mask     */
	AUD_CMD_EFFECT,
	AUD_CMD_KEY										/* key-shift ctrl in half-keys  */
};

/*
**	output channel control.
*/
#define	AUD_CHN_LEFT	(0x01<<0)
#define	AUD_CHN_RIGHT	(0x01<<1)
#define	AUD_CHN_LS	(0x01<<2)
#define	AUD_CHN_RS	(0x01<<3)
#define	AUD_CHN_CENTER	(0x01<<4)
#define	AUD_CHN_LFE	(0x01<<5)

/*
**	spatial effect
*/
#define	AUD_EFF_NONE	(0)
#define	AUD_EFF_HALL	(1)
#define	AUD_EFF_PUB	(2)
#define	AUD_EFF_	(3)

int     ctl_audio(UINT32 cmd, UINT32 param);

#endif /*AUDIO_H */