Пример #1
0
// Set the volume of all channels of this sink to a factor of the maximum
// volume (0.0 <= v <= 1.0).  Factors greater than 1.0 will be accepted, but
// clipping or distortion may occur beyond that value.
//
func (self *Sink) SetVolume(factor float64) error {
	if self.Channels > 0 {
		operation := NewOperation(self.Client)
		newVolume := &C.pa_cvolume{}

		//  new volume is the (maximum number of normal volume steps * factor)
		newVolume = C.pa_cvolume_init(newVolume)
		newVolumeT := C.pa_volume_t(C.uint32_t(uint(float64(self.NumVolumeSteps) * factor)))

		//  prepare newVolume for its journey into PulseAudio
		C.pa_cvolume_set(newVolume, C.uint(self.Channels), newVolumeT)

		//  make the call
		operation.paOper = C.pa_context_set_sink_volume_by_index(C.pulse_get_context(), C.uint32_t(self.Index), newVolume, (C.pa_context_success_cb_t)(unsafe.Pointer(C.pulse_generic_success_callback)), unsafe.Pointer(operation))

		//  wait for the result, refresh, return any errors
		return operation.WaitSuccess(func(op *Operation) error {
			return self.Refresh()
		})
	} else {
		return fmt.Errorf("Cannot set volume on sink %d, no channels defined", self.Index)
	}

	return nil
}
Пример #2
0
// Set the volume of all channels of this source to a factor of the maximum
// volume (0.0 <= v <= 1.0).  Factors greater than 1.0 will be accepted, but
// clipping or distortion may occur beyond that value.
//
func (self *Source) SetVolume(factor float64) error {
	if self.Channels > 0 {
		operation := NewOperation(self.Client)
		defer operation.Destroy()
		newVolume := &C.pa_cvolume{}

		//  new volume is the (maximum number of normal volume steps * factor)
		newVolume = C.pa_cvolume_init(newVolume)
		newVolumeT := C.pa_volume_t(C.uint32_t(uint(float64(self.NumVolumeSteps) * factor)))

		//  prepare newVolume for its journey into PulseAudio
		C.pa_cvolume_set(newVolume, C.uint(self.Channels), newVolumeT)

		//  make the call
		operation.paOper = C.pa_context_set_source_volume_by_index(self.Client.context, C.uint32_t(self.Index), newVolume, (C.pa_context_success_cb_t)(C.pulse_generic_success_callback), operation.ToUserdata())

		//  wait for the result, refresh, return any errors
		if err := operation.Wait(); err == nil {
			return self.Refresh()
		} else {
			return err
		}
	} else {
		return fmt.Errorf("Cannot set volume on source %d, no channels defined", self.Index)
	}

	return nil
}