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MP_ENVELOPE_SEGMENT Structure

  • Artigo
 
Microsoft DirectShow 9.0

MP_ENVELOPE_SEGMENT Structure

The MP_ENVELOPE_SEGMENT structure defines an envelope segment used by an envelope-following parameter.

Syntax

typedef struct _MP_ENVELOPE_SEGMENT {
    REFERENCE_TIME   rtStart;
    REFERENCE_TIME   rtEnd;
    MP_DATA          valStart;
    MP_DATA          valEnd;
    MP_CURVE_TYPE    iCurve;
    MP_FLAGS         flags;
} MP_ENVELOPE_SEGMENT;

Members

rtStart

Start time of the segment, relative to the time stamp on the first buffer, in 100-nanosecond units.

rtEnd

Stop time of the segment, relative to the time stamp on the first buffer, in 100-nanosecond units.

valStart

Initial value of the parameter, at the start of the segment.

valEnd

Final value of the parameter, at the end of the segment.

iCurve

Member of the MP_CURVE_TYPE enumerated type that specifies the curve followed by the parameter.

flags

Specifies one of the following flags.

Constant Value Description
MP_FLAGS MPF_ENVLP_STANDARD 0x0000 Use all the information provided with the envelope segment.
MP_FLAGS MPF_ENVLP_BEGIN_CURRENTVAL 0x0001 Ignore the specified start value. Start from the current value.
MP_FLAGS MPF_ENVLP_BEGIN_NEUTRALVAL 0x0002 Ignore the specified start value. Start from the neutral value. (See MP_PARAMINFO.)

Requirements

  Header: Medparam.h

See Also