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MIDI CC and MIDI Clock (herve.noury)

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MIDI CC and MIDI Clock (herve.noury)

Subject: MIDI CC and MIDI Clock (herve.noury)
From: "herve.noury" <email@hidden>
Date: Fri, 30 Dec 2011 11:51:07 +0100

Hello,

I answer to myself about the MIDI CC, but I steel need help concerning how to send the BPM value from a host to the AU, and how to call this value inside the AU.

To send from the host to the AU the MIDI CC, I do now this :

- (void) sendModulation: (float) xVal{

MusicDeviceComponent synthUnit;

AUGraphNodeInfo (_graph, _synthNode, NULL, &synthUnit);

int ct1 = (int) floorf(xVal);

Byte cc1[3];

cc1[0] = 0xB0;

cc1[1] = 1;

cc1[2] = ct1;

MusicDeviceMIDIEvent (synthUnit, cc1[0], cc1[1], cc1[2], 0);

}

This method works fine now.

I think that I should use this kind of method to send a value of BPM but how to do?

I founded 2 structures about time synchronization :

struct AudioTimeStamp {

Float64 mSampleTime;

UInt64 mHostTime;

Float64 mRateScalar;

UInt64 mWordClockTime;

SMPTETime mSMPTETime;

UInt32 mFlags;

UInt32 mReserved;

};

and

struct SMPTETime {

SInt16 mSubframes;

SInt16 mSubframeDivisor;

UInt32 mCounter;

UInt32 mType;

UInt32 mFlags;

SInt16 mHours;

SInt16 mMinutes;

SInt16 mSeconds;

SInt16 mFrames;

};

How can I use them inside a MonotimbralInstrument AU? Few persons in that list seem to create music synthesizers, but some know the answer certainly. Thanks for your help then.

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