unsigned
SimpleMixer::mix(float *outputs, unsigned space)
{
float sum = 0.0f;
if (_info == nullptr)
return 0;
if (space < 1)
return 0;
for (unsigned i = 0; i < _info->control_count; i++) {
float input;
_control_cb(_cb_handle,
_info->controls[i].control_group,
_info->controls[i].control_index,
input);
sum += scale(_info->controls[i].scaler, input);
}
*outputs = scale(_info->output_scaler, sum);
return 1;
}
float
Mixer::get_control(uint8_t group, uint8_t index)
{
float value;
_control_cb(_cb_handle, group, index, value);
return value;
}
int
SimpleMixer::check()
{
int ret;
float junk;
/* sanity that presumes that a mixer includes a control no more than once */
/* max of 32 groups due to groups_required API */
if (_pinfo->control_count > 32) {
return -2;
}
/* validate the output scaler */
ret = scale_check(_pinfo->output_scaler);
if (ret != 0) {
return ret;
}
/* validate input scalers */
for (unsigned i = 0; i < _pinfo->control_count; i++) {
/* verify that we can fetch the control */
if (_control_cb(_cb_handle,
_pinfo->controls[i].control_group,
_pinfo->controls[i].control_index,
junk) != 0) {
return -3;
}
/* validate the scaler */
ret = scale_check(_pinfo->controls[i].scaler);
if (ret != 0) {
return (10 * i + ret);
}
}
return 0;
}
