KSNODEPROPERTY_AUDIO_CHANNEL - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// ksmedia.h

typedef struct {
  KSNODEPROPERTY NodeProperty;
  LONG           Channel;
  ULONG          Reserved;
} KSNODEPROPERTY_AUDIO_CHANNEL, *PKSNODEPROPERTY_AUDIO_CHANNEL;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ns-ksmedia-ksnodeproperty_audio_channel)

KSNODEPROPERTY_AUDIO_CHANNEL structure

Description

The KSNODEPROPERTY_AUDIO_CHANNEL structure specifies a property of a channel in a node.

Members

NodeProperty

Specifies both the target node and the property to get or set. This member is a structure of type KSNODEPROPERTY.

Channel

Specifies a channel number. This member identifies the channel that is to be controlled. Given a stream with n channels, the channels are numbered 0 to n-1. When a channel number of -1 (0xFFFFFFFF) is specified, the level applies to the entire stream.

It is important to note that the standard USB audio specification provides a mechanism that allows audio drivers that support the master channel control feature, to apply channel-specific information to an entire stream. To implement this mechanism, the USB audio driver must set the channel number to zero (0). Therefore, when a USB audio driver sets the channel number to -1, there is no guarantee that the property information will be applied to the entire stream.

Reserved

Reserved for internal use by operating system. Do not use.

See also

KSNODEPROPERTY

KSPROPERTY_AUDIOENGINE_VOLUMELEVEL

View the official Windows Driver Kit DDI reference

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