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ACX_INTERLEAVED_AUDIO_FORMAT_INFORMATION structure (acxpin.h)

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The ACX_INTERLEAVED_AUDIO_FORMAT_INFORMATION structure specifies how loopback audio is interleaved with the microphone audio for KSPROPERTY_INTERLEAVEDAUDIO_FORMATINFORMATION.

Syntax

typedef struct _ACX_INTERLEAVED_AUDIO_FORMAT_INFORMATION {
  ULONG Size;
  ULONG PrimaryChannelCount;
  ULONG PrimaryChannelStartPosition;
  ULONG PrimaryChannelMask;
  ULONG InterleavedChannelCount;
  ULONG InterleavedChannelStartPosition;
  ULONG InterleavedChannelMask;
} ACX_INTERLEAVED_AUDIO_FORMAT_INFORMATION, *PACX_INTERLEAVED_AUDIO_FORMAT_INFORMATION;

Members

Size

The size of all of the data in the ACX_INTERLEAVED_AUDIO_FORMAT_INFORMATION structure in bytes.

PrimaryChannelCount

The number of the primary channels. This is typically the number of microphone elements when interleaving the microphone and loopback audio.

PrimaryChannelStartPosition

The array index of the first channel for the primary audio.

PrimaryChannelMask

The primary channel mask, KSAUDIO_SPEAKER_MONO, KSAUDIO_SPEAKER_STEREO, etc.

InterleavedChannelCount

The number of interleaved channels. This is typically the number of channels for the loopback audio associated with the primary channels.

InterleavedChannelStartPosition

The array index of the first channel for the interleaved audio.

InterleavedChannelMask

The interleaved channel mask, KSAUDIO_SPEAKER_MONO, KSAUDIO_SPEAKER_STEREO, etc.

Remarks

The data described by this structure is intended only for the Hardware Keyword Spotter pin and provides a way to include loopback audio interleaved with the microphone audio. This is done by interleaving the Hardware Keyword Spotter pin audio and loopback audio together into a single PCM audio stream and then communicating, via this property, the channels containing loopback vs. microphone audio.

The WAVEFORMATEXTENSIBLE returned by the driver reports the channel count as a sum of the primary and loopback audio, with a channel mask appropriate for the total channel count. The primary and interleaved audio must have matching bits per sample, sample rate, etc. This structure communicates all information needed to split the two streams of data.

ACX requirements

Minimum ACX version: 1.0

For more information about ACX versions, see ACX version overview.

Requirements

Requirement Value
Header acxpin.h

See also