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From: vandevyver@ketje.enet.dec.com (Luc Van de Vyver)
Newsgroups: comp.sys.mac.programmer
Subject: Sound Manager problem
Message-ID: <17982@shlump.nac.dec.com>
Date: 9 Dec 90 20:17:34 GMT
Sender: newsdaemon@shlump.nac.dec.com
Organization: Digital Equipment Corporation
Lines: 98


    I am writing a program, to control 2 slide-projectors with the MAC.

    The projectors can be controlled by sound. Every frequency has a
    meaning (ex. advance A, advance B, %light for projectore A ...);

    Everything works fine, except a fluent dissolve from one projector to
    the other. The reason for this is that I am using NOTES to send the a
    sound with the right frequency to the projector.

    For one reason or another exact FREQUENCY output seems not to work as
    indicated in the INSIDE MACINTOSH IV.

    I included the some test code which explains exactly what is not
    working. 
    btw, I am using a MAC SE, THINK C 3.0, finder 6.0.4

    All help is appreciated very much.

    Luc.


    CODE EXTRACT :

    #include "SoundMgr.h"
    #include "stdio.h"

    #define NIL			0
    #define NIL_POINTER		0L

    SndChannelPtr   	chanPtr 		= NIL;
    SndCommand      	sndCmd;
    long 		status, currNote;
    long		note			= 80L;
    long		freq1  			= 0x000F5DDE;
    long		freq2			= 0xEE0F5DDE;

    Frequency()

    {

    		/* Assign a channel to the Notesynthesizer */
    		chanPtr 	= NIL;
    		status 		= SndNewChannel(&chanPtr, 1, NIL, NIL_POINTER);


    		/* set the default timbre */
    		sndCmd.cmd	=	timbreCmd;
    		sndCmd.param1	=	1;
    		sndCmd.param2	= 	NIL;
    		status 		= 	SndDoImmediate(chanPtr, &sndCmd);
    		
    		sndCmd.cmd	=	ampCmd;
    		sndCmd.param1	=	100;
    		sndCmd.param2	= 	NIL;
    		status 		= 	SndDoImmediate(chanPtr, &sndCmd);

    /* this says piep */	
    		sndCmd.cmd	=	freqCmd;
    		sndCmd.param1	=	NIL;
    		sndCmd.param2	= 	note;
    		status 		= 	SndDoImmediate(chanPtr, &sndCmd);
    		printf("\n Status = %ld - freq = %ld", status,
      					sndCmd.param2, sndCmd.param2);
    		Wait(30);
    		
    /* this is silence WHY?????? */
    		sndCmd.cmd	=	freqCmd;
    		sndCmd.param1	=	NIL;
    		sndCmd.param2	= 	freq1;
    		status 		= 	SndDoImmediate(chanPtr, &sndCmd);                   
    		printf("\n Status = %ld - freq = %ld (%lX)", status,
    					sndCmd.param2, sndCmd.param2);
    		Wait(30);
    		
    /* this is silence WHY???????*/
    		sndCmd.cmd	=	freqCmd;
    		sndCmd.param1	=	NIL;
    		sndCmd.param2	= 	freq2;
    		status 		= 	SndDoImmediate(chanPtr, &sndCmd);
    		printf("\n Status = %ld - freq = %ld (%lX)", status,
    					sndCmd.param2, sndCmd.param2);
    		Wait(30);

    /* this says piep */	
    		sndCmd.cmd	=	freqCmd;
    		sndCmd.param1	=	NIL;
    		sndCmd.param2	= 	note;
    		status 		= 	SndDoImmediate(chanPtr, &sndCmd);
    		printf("\n Status = %ld - freq = %ld (%lX)", status,
    					sndCmd.param2, sndCmd.param2);
    		Wait (30);

    		status = SndDisposeChannel (chanPtr, FALSE);
    		chanPtr = NIL;


    }