IXAudio2Voice::SetChannelVolumes method (xaudio2.h)

Article
02/22/2024

Sets the volume levels for the voice, per channel.

Syntax

\\HRESULT SetChannelVolumes(
  [in] UINT32      Channels,
  [in] const float *pVolumes,
  [in] UINT32      OperationSet
);

Parameters

[in] Channels

Number of channels in the voice.

[in] pVolumes

Array containing the new volumes of each channel in the voice. The array must have Channels elements. See Remarks for more information on volume levels.

[in] OperationSet

Identifies this call as part of a deferred batch. See the XAudio2 Operation Sets overview for more information.

Return value

Returns S_OK if successful, an error code otherwise. See XAudio2 Error Codes for descriptions of XAudio2 specific error codes.

Remarks

SetChannelVolumes controls a voice's per-channel output levels and is applied just after the voice's final SRC and before its sends.

This method is valid only for source and submix voices, because mastering voices do not specify volume per channel.

Volume levels are expressed as floating-point amplitude multipliers between -XAUDIO2_MAX_VOLUME_LEVEL and XAUDIO2_MAX_VOLUME_LEVEL (-2²⁴ to 2²⁴), with a maximum gain of 144.5 dB. A volume of 1 means there is no attenuation or gain and 0 means silence. Negative levels can be used to invert the audio's phase. See XAudio2 Volume and Pitch Control for additional information on volume control.

Note IXAudio2Voice::GetChannelVolumes always returns the volume levels most recently set by IXAudio2Voice::SetChannelVolumes. However, those values may not actually be in effect yet: they only take effect the next time the audio engine runs after the IXAudio2Voice::SetChannelVolumes call (or after the corresponding IXAudio2::CommitChanges call, if IXAudio2Voice::SetChannelVolumes was called with a deferred operation ID).

Platform Requirements

Windows 10 (XAudio2.9); Windows 8, Windows Phone 8 (XAudio 2.8); DirectX SDK (XAudio 2.7)

Requirements

Requirement	Value
Target Platform	Windows
Header	xaudio2.h