trauShowDSPInfo

typedef struct _TRAU_INFO

{

unsigned size; /* Size (determined by #chns */

CTAHD loadhd; /* Associated load handle */

unsigned type; /* Vocoder type */

unsigned max_channels; /* Max channels supported */

unsigned detached_channels; /* Number of detached chns */

unsigned frame_tic; /* tics in .25ms increments */

unsigned max_frame_size; /* Host-based:max chn frame */
/* size */
unsigned underrun_count_read; /* # of underruns up since */

/* LOAD_DONE event */

unsigned underrun_count_write; /* # of underruns down since */

/* LOAD_DONE event */
TRAU_CHN_INFO_DATA pChannel[MAX_CHANNELS_DSP];/* Chn info */

} TRAU_INFO;

typedef struct _TRAU_CHN_INFO_DATA

{

CTAHD ctahd; /* ctahd associated with */

/* this trauchn */

TRAU_STATE state; /* State of channel defined */

/* in TRAU_STATE */

unsigned chn_underrun_count_read; /* # of underruns up since */
/* LOAD_DONE event */

unsigned chn_underrun_count_write; /* # of underruns down */

/* since LOAD_DONE event */

DWORD bus; /* Bus used */

int pcm_stream_from_dsp; /* Stream used for voice PCM */

int pcm_stream_to_dsp; /* Stream used for voice PCM */

DWORD pcm_slot; /* PCM bus,stream,slot for */

/* voice data */

/* TX FUSION ONLY DATA FOLLOWS(set to 0 if HB) */

int tx_stream_from_dsp; /* Stream used for HDLC data */

/* from TX */

int tx_stream_to_dsp; /* Stream used for HDLC data */

/* to TX */

int tx_count; /* Number of bonded */

/* timeslots used */

DWORD tx_slot[ TX_MAX_SLOTS ]; /* Array of compressed */
/* timeslots */

} TRAU_CHN_INFO_DATA;

• Read underruns: Produced when the NMS board drops buffers because the AG TRAU service does not provide buffers in a timely manner. The number of buffers affected by read underruns is indicated in the chn_underrun_count_read field of the TRAU_CHN_INFO_DATA structure.

• Write underruns: Produced when the input rate data received from some external source exceeds the output rate of the AG TRAU service. The number of buffers effected by write underruns is shown in the chn_underrun_count_write field of the TRAU_CHN_INFO_DATA structure.
  Note: Applications that use trauRegisterCallback must determine when to drop buffers based on the number of write underruns Typically this is because host CPU processing limitations make the AG TRAU service unable to send buffers fast enough to meet DSP requirements.