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#define AUDIO_BITS_FLAG 0x00000001
#define AUDIO_BUF_FLAG 0x00000002
#define AUDIO_CHAN_FLAG 0x00000004
#define AUDIO_COUNT_FLAG 0x00000008
#define AUDIO_DEV_FLAG 0x00000010
#define AUDIO_ENC_FLAG 0x00000020
#define AUDIO_RATE_FLAG 0x00000040
#define AUDIO_VOL_FLAG 0x00000080
#define AUDIO_LEFT_FLAG 0x00000100
#define AUDIO_RIGHT_FLAG 0x00000200
#define AUDIO_IN_FLAG 0x00000400
#define AUDIO_OUT_FLAG 0x00000800
#define AUDIO_MOD_FLAG 0x10000000
#define Audio_Min_Val 0
#define Audio_Max_Val 100
#define Audio_No_Val 0
#define Audio_In_Val 1
#define Audio_Out_Val 2
#define Audio_Max_Buf 32768
#define Bits_Per_Byte 8
typedef struct Audio_d Audio_d;
struct Audio_d {
ulong flags; /* bit flag for fields */
ulong bits; /* bits per sample */
ulong buf; /* buffer size */
ulong chan; /* number of channels */
ulong dev; /* device */
ulong enc; /* encoding format */
ulong rate; /* samples per second */
ulong left; /* left channel gain */
ulong right; /* right channel gain */
};
typedef struct Audio_t Audio_t;
struct Audio_t {
Audio_d in; /* input device */
Audio_d out; /* output device */
};
#define AUDIO_CMD_MAXNUM 32
void audio_info_init(Audio_t*);
int audioparse(char*, int n, Audio_t*);
enum
{
Qdir = 0, /* must start at 0 representing a directory */
Qaudio,
Qaudioctl
};
/* required external platform specific functions */
void audio_file_init(void);
void audio_file_open(Chan*, int);
long audio_file_read(Chan*, void*, long, vlong);
long audio_file_write(Chan*, void*, long, vlong);
long audio_ctl_write(Chan*, void*, long, vlong);
void audio_file_close(Chan*);
typedef struct _svp_t {
char* s; /* string */
unsigned long v; /* value */
} svp_t;
/* string value pairs for default audio values */
extern svp_t audio_chan_tbl[];
extern svp_t audio_indev_tbl[];
extern svp_t audio_outdev_tbl[];
extern svp_t audio_enc_tbl[];
extern svp_t audio_rate_tbl[];
extern svp_t audio_val_tbl[];
extern svp_t audio_bits_tbl[];
extern Audio_d Default_Audio_Format;
extern int Default_Audio_Input, Default_Audio_Output;
extern Audio_t* getaudiodev(void);
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