Townshend Computer Tools DAT-Link - Na Info

178 NA INFO(3)
NAME
NAGetInfo, NAGetDefaultInfo, NASetInfo – library routines for setting/getting NetAudio server info
DESCRIPTION
These routines allow C programs to retrieve the current status of the NetAudio server or modify the set-
d
tings. Communication is via a single C structure declared in netaudio.h. The structure, NAinfo, is
eclared as follows:
typedef struct {
float sampleRate; /∗ Sampling rate of data stream ∗/
c
float externalRate; /∗ External sampling rate ∗/
har precision; /∗ Number of bits per sample ∗/
c
char encoding; /∗ Data encoding ∗/
har channels; /∗ Stereo/mono definition ∗/
/
fl
char waiting; /∗ Process wants to transfer data ∗
oat gain; /∗ Gain control - 1.0 = unscaled ∗/
/
N
float VUdecayRate; /∗ VU decay rate in dB/second ∗
Astate state; /∗ State of transfers ∗/
/
u
NAxfrError error; /∗ Cause of transfer error ∗
nsigned int bufferSize; /∗ Number of bytes of buffering ∗/
u
/∗ AES/EBU info ∗/
nsigned char leftCS[24]; /∗ Left channel status (RO for record) ∗/
/
u
unsigned char rightCS[24]; /∗ Right channel status (RO for record) ∗
nsigned char user[4]; /∗ User bits (RO for record) ∗/
/
} NAinfosect;
∗ Info structure ∗/
typedef struct {
/∗ Fields that are repeated for playback and record ∗/
N
NAinfosect playback;
Ainfosect record;
NAclock clock; /∗ Clock source for playback ∗/
/
u
unsigned char master; /∗ 1 to become a master clock ∗
nsigned char skipSilence; /∗ 1 to skip silence on record ∗/
/
unsigned char locked; /∗ 1 if input signal present ∗/
∗ Info about server ∗/
;
i
int protoMajorVersion
nt protoMinorVersion;
char hardware[16]; /∗ Name of server hardware ∗/
/
int hwVersion; /∗ Server hardware version ∗/
∗ Fields specific to DAT-Link ∗/
/
u
unsigned short source; /∗ Input source ∗
nsigned short rxstatus; /∗ Status of AES receiver ∗/
/
c
unsigned char loopback; /∗ 1 to enable ramp output ∗
har dspProgram[16]; /∗ Name of current DSP program ∗/
}
int dspSIOMode; /∗ DSP32C’s serial port mode ∗/
NAinfo;
As can be seen above, the NAinfo structure contains two identical sub-structures to describe the play-
.
T
back and recording status as well as additional values that are not dependent on the transfer direction
he fields of NAinfo and NAinfosect are described below: