DMUS_CURVE_PMSG
The DMUS_CURVE_PMSG structure contains message data for a curve .
Syntax
typedef struct DMUS_CURVE_PMSG {
DMUS_PMSG_PART
MUSIC_TIME mtDuration;
MUSIC_TIME mtOriginalStart;
MUSIC_TIME mtResetDuration;
short nStartValue;
short nEndValue;
short nResetValue;
WORD wMeasure;
short nOffset;
BYTE bBeat;
BYTE bGrid;
BYTE bType;
BYTE bCurveShape;
BYTE bCCData;
BYTE bFlags;
WORD wParamType;
WORD wMergeIndex;
} DMUS_CURVE_PMSG;
Members
DMUS_PMSG_PART
Macro for common message members. See DMUS_PMSG.
mtDuration
Duration of the curve. This value is in music time unless DMUS_PMSGF_LOCKTOREFTIME is present in the dwFlags member of DMUS_PMSG_PART, in which case the duration is in milliseconds and is unaffected by a change in tempo.
mtOriginalStart
Original start time. Must be set to either zero when this message is created, or to the original start time of the curve.
mtResetDuration
Length of time after the end of the curve during which a reset can take place in response to an invalidation. Ignored if DMUS_CURVE_RESET is not in bFlags. This value is in music time unless DMUS_PMSGF_LOCKTOREFTIME is present in the dwFlags member of DMUS_PMSG_PART, in which case it is in milliseconds and is unaffected by a change in tempo.
nStartValue
Start value of the curve.
nEndValue
End value of the curve.
nResetValue
Value to set upon a flush or invalidation. Ignored if DMUS_CURVE_RESET is not in bFlags.
wMeasure
Measure in which this curve occurs.
nOffset
Offset from the grid at which this curve occurs, in music time.
bBeat
Beat count (within a measure) at which this curve occurs.
bGrid
Grid offset from the beat at which this curve occurs.
bType
Type of curve. This can be one of the following values.
| Value | Description |
| DMUS_CURVET_CCCURVE | Continuous controller curve (MIDI Control Change channel voice message; status byte &HBn.). |
| DMUS_CURVET_MATCURVE | Monophonic aftertouch curve (MIDI Channel Pressure channel voice message; status byte &HDn). |
| DMUS_CURVET_PATCURVE | Polyphonic aftertouch curve (MIDI Poly Key Pressure channel voice message, status byte &HDn). |
| DMUS_CURVET_PBCURVE | Pitch-bend curve (MIDI Pitch Bend channel voice message; status byte &HEn). |
| DMUS_CURVET_RPNCURVE | RPN curve of type defined in wParamType. |
| DMUS_CURVET_NRPNCURVE | NRPN curve of type defined in wParamType. |
bCurveShape
Shape of curve. This can be one of the following values.
| Value | Description |
| DMUS_CURVES_EXP | Exponential curve shape. |
| DMUS_CURVES_INSTANT | Instant curve shape (beginning and end of curve happen at essentially the same time). |
| DMUS_CURVES_LINEAR | Linear curve shape. |
| DMUS_CURVES_LOG | Logarithmic curve shape. |
| DMUS_CURVES_SINE | Sine curve shape. |
bCCData
Controller number if bType is DMUS_CURVET_CCCURVE; otherwise ignored.
bFlags
Can be zero, or one or more of the following values.
| Value | Description |
| DMUS_CURVE_RESET | The value of nResetValue must be set when the time is reached or an invalidation occurs because of a transition. If this flag is not set, the curve stays permanently at the new value. |
| DMUS_CURVE_START_FROM_CURRENT | Ignore nStartValue and start the curve at the current value. Implemented for volume, expression, pitch bend, filter cutoff, pan, and mod wheel. See Remarks. |
wParamType
MIDI parameter number. This value is significant only if DMUS_PMSGF_DX8 is present in the dwFlags member of the DMUS_PMSG part of this structure. See Remarks.
wMergeIndex
Merge index. Supported for transpose, pitch bend, volume, expression, pan, filter, mod wheel, chorus, and reverb controllers. This value is significant only if DMUS_PMSGF_DX8 is present in the dwFlags member of the DMUS_PMSG part of this structure. See Remarks.
Remarks
An RPN or NRPN curve type in wParamType is stored as two bytes with seven significant bits. For example, if the MSB is 0x23 and the LSB is 0x74, the value in wParamType is 0x2374.
Data in nStartValue, nEndValue, and nResetValue is limited to 14 bits. For MIDI data consisting of two seven-bit bytes, the value is stored as a word with the upper two bits empty.
All curves with wMergeIndex of 0 override each other. If wMergeIndex is another value, the values generated by the curve are added to the values for merge index 0. For example, if an application uses curves with 0 and 3, the 0 curves always replace each other but add to the 3 curves, and the 3 curves also always replace each other and add to the 0 curves.
The DMUS_CURVE_START_FROM_CURRENT flag does not cause the current controller value to be saved in the message. Therefore tools do not have access to this data unless they store the last known value.
Requirements
** Header:** Dmusici.h