=?iso-8859-1?Q?Need_help_wit_sound_stream_on_TT?=

[c . prinoth]

I wrote a piece of code which should be playing a continuous 440Hz tone, but
all I get is the tone with noises, clicks and lots of pauses. Anyone have an
idea of what I might be doing wrong?

Here is what I am doing:

int onoff;
SndStreamRef stream1;
const int Rate=11025;
typedef struct  {
 int freq;
 Int32 fcount;
} data;
data mydata;

/***********************************************************************
 *
 * Internal Functions
 *
 ***********************************************************************/
UInt16 getbuf(void *userData, SndStreamRef stream, void *buffer, UInt32
frameCount)
{
  data *mydata=(data*)userData;
        Int32 buf_size;
        Int16 *buf_ptr=(Int16 *)buffer;
        Int32 I,V;
        UInt32 rate, freq;
        Int32 L1,L2,K;
        V=10;
        freq=mydata->freq;
        rate=Rate;
        buf_size=frameCount;
        K=0x10000*freq/rate;
        L1=mydata->fcount;
        for(I=0;I<buf_size;I++)
        {
   L2=L1+K;
   buf_ptr[I]+=V*(L1&0x8000? (L2&0x8000? 1:0):(L2&0x8000? 0:-1));
   L1=L2;
        }
        mydata->fcount=L1;
        return errNone;
}

void suona(void)
{
Err err;
mydata.freq=440;

if(onoff==0){
 mydata.fcount=0;
 err=SndStreamCreate(&stream1, sndOutput, Rate, sndInt16Little, sndMono,
getbuf, &mydata, 256, false);
 err=SndStreamStart(stream1);
 onoff=1;
} else
{
 err=SndStreamDelete(stream1);
 onoff=0;
}

Thanks in advance,
Chris


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