Audio Delay

The Audio Delay block control supports fine-grained adjustment of a digital audio delay. More...

The Audio Delay block control supports fine-grained adjustment of a digital audio delay.

Multiple independent Audio Delay blocks support independent settings across device outputs.

The Audio Delay is a block control which is in turn an implementation of a universal control (see Universal Control).

Data types

The list of supported datatypes is as follows:

entity_type_int

A 32 bit integer.

entity_type_sequence

Sequence of potentially heterogeneous entities.

Conceptually similar to C struct.

Audio Delay

Audio Delay

The audio delay block

Delay

The delay setting in microseconds

Maximum Delay

The maximum delay (in microseconds) supported

Parameter list

Name	Audio Delay
Description	The audio delay block.
Optional	No
Type	sequence / entity_type_sequence / a sequence of parameters follow
Count	2
Attributes	read
Added in version	4.08.00
Example	static void print_block_control( hpi_hsubsys_t *hSubSys, hpi_handle_t hMixer, hpi_handle_t hControl ) { enum e_entity_role r; hpi_err_t err; char name[256]; size_t size, items; int count; err = HPI_Object_GetRole(hControl, &r); if (err) HandleError(err); // name size = sizeof(name); err = HPI_Object_GetInfo( hControl, entity_type_cstring, entity_role_classname, name, &size, &items); if (err) HandleError(err); printf(" %s", name); // count size = sizeof(count); err = HPI_Object_GetInfo( hControl, entity_type_int, entity_role_value, &count, &size, &items); if (err) HandleError(err); printf(", count %d", count); // fetch parameter handles if ( r == entity_role_block ) { hpi_handle_t params[16]; /* should really use count */ int i; size_t number; printf(" ["); number = sizeof(params)/sizeof(hpi_handle_t); err = HPI_Object_BlockParameters( hMixer, hControl, params, &number); if (err) HandleError(err); for ( i=0 ; i<number ; i++ ) { if (i > 0) printf(", "); printf("%d",params[i]); } printf("]"); } }

Name	Delay
Description	The delay setting in microseconds. Steps are in 125 microseconds. Maximum is the smaller of 10 seconds and the Maximum Delay parameter.
Optional	No
Type	integer / entity_type_int / C99 type int32_t
Count	1
Attributes	read/write with volatile info (e.g. limits may change)
Default	0
Added in version	4.08.00
Example	struct hpi_control_t asihpi_control; hpi_handle_t block; hpi_handle_t param; size_t value_size; size_t value_items; int Delay; /* set source and destination node */ asihpi_control.wSrcNodeType = x; asihpi_control.wSrcNodeIndex = j; asihpi_control.wDstNodeType = y; asihpi_control.wDstNodeIndex = j; err = HPI_Object_BlockHandle(hMixer, asihpi_control.wSrcNodeType, asihpi_control.wSrcNodeIndex, asihpi_control.wDstNodeType, asihpi_control.wDstNodeIndex, "Audio Delay", &block ); err = HPI_Object_ParameterHandle( hMixer, block, "Delay", &param); if (!err) { err = HPI_Object_GetInfo( param, entity_type_int, entity_role_value, NULL, &value_size, &value_items); } err = HPI_Object_GetValue(param, entity_type_int, 1, &Delay, sizeof(Delay) ); Delay = 1; err = HPI_Object_SetValue(param, entity_type_int, 1, &Delay, sizeof(Delay));
Units	microseconds

Name	Maximum Delay
Description	The maximum delay (in microseconds) supported. Adjusting the maximum delay will cause the limits of the Delay parameter to be changed. Additionally, as more memory is allocated to delay storage, the limit for the maximum setting of this parameter is adjusted. As a side-effect, as global memory is allocated, the limits for this parameter in other Audio Delay blocks are also updated.
Optional	No
Type	integer / entity_type_int / C99 type int32_t
Count	1
Attributes	read/write with volatile info (e.g. limits may change)
Default	50000 (50 milliseconds)
Added in version	4.08.00
Example	struct hpi_control_t asihpi_control; hpi_handle_t block; hpi_handle_t param; size_t value_size; size_t value_items; int Maximum_Delay; /* set source and destination node */ asihpi_control.wSrcNodeType = x; asihpi_control.wSrcNodeIndex = j; asihpi_control.wDstNodeType = y; asihpi_control.wDstNodeIndex = j; err = HPI_Object_BlockHandle(hMixer, asihpi_control.wSrcNodeType, asihpi_control.wSrcNodeIndex, asihpi_control.wDstNodeType, asihpi_control.wDstNodeIndex, "Audio Delay", &block ); err = HPI_Object_ParameterHandle( hMixer, block, "Maximum Delay", &param); if (!err) { err = HPI_Object_GetInfo( param, entity_type_int, entity_role_value, NULL, &value_size, &value_items); } err = HPI_Object_GetValue(param, entity_type_int, 1, &Maximum_Delay, sizeof(Maximum_Delay) ); Maximum_Delay = 1; err = HPI_Object_SetValue(param, entity_type_int, 1, &Maximum_Delay, sizeof(Maximum_Delay));
Units	microseconds