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AecQualityMetrics_Struct Structure

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Contains quality metrics for acoustic echo cancellation (AEC). This structure is used with the MFPKEY_WMAAECMA_RETRIEVE_TS_STATS property.

Syntax

typedef struct tagAecQualityMetrics_Struct {
    LONGLONG i64Timestamp;
    BYTE  ConvergenceFlag;
    BYTE  MicClippedFlag;
    BYTE  MicSilenceFlag;
    BYTE  PstvFeadbackFlag;
    BYTE  SpkClippedFlag;
    BYTE  SpkMuteFlag;
    BYTE  GlitchFlag;
    BYTE  DoubleTalkFlag;
    ULONG uGlitchCount;
    ULONG uMicClipCount;
    float fDuration; 
    float fTSVariance;
    float fTSDriftRate;
    float fVoiceLevel;
    float fNoiseLevel;
    float fERLE;
    float fAvgERLE;
    DWORD dwReserved;
} AecQualityMetrics_Struct;

Members

i64Timestamp

Time stamp that indicates when the quality metrics were collected.

ConvergenceFlag

AEC convergence flag.

MicClippedFlag

If TRUE, the input signal from the audio capture device was clipped.

MicSilenceFlag

If TRUE, the input signal from the audio capture device was silent or too quiet.

PstvFeadbackFlag

If TRUE, positive feedback is causing a chirping sound.

SpkClippedFlag

If TRUE, the input signal from the audio rendering device was clipped.

SpkMuteFlag

If TRUE, the input signal from the audio rendering device was silent or too quiet.

GlitchFlag

A glitch occurred in the input data.

DoubleTalkFlag

Double talk flag.

uGlitchCount

Number of glitches.

uMicClipCount

Number of times the audio capture signal was clipped.

fDuration

Running duration of the AEC process.

fTSVariance

Long-term average variance in the time stamps.

fTSDriftRate

Long-term average drift rate in the time stamps.

fVoiceLevel

Near-end voice level after AEC processing.

fNoiseLevel

Noise level of the audio capture signal.

fERLE

Echo return loss enhancement (ERLE).

fAvgERLE

Average ERLE over the entire duration of AEC processing.

dwReserved

Reserved.

Requirements

Client: Requires Windows Vista or Windows XP.

Header: Include wmcodecdsp.h.

See Also