linuxaudio.org

Hi,
I'm trying to add a threaded timer to kluppes looperdata.c

looperdata_calc_sample_stereo function so that I can add a delayed

restart to the loop process.
Can anyone tell me why the "while" statement in the following code locks

up the audio stream for the loop it is being run on? I end up with a

buzz throughout the delay period instead of a nice quiet delay period.
#include

#include

#include 
/* This flag controls termination of the main loop.  */

volatile sig_atomic_t isdelay_countdown = 1;
/* The signal handler just clears the flag and re-enables itself.  */

void catch_alarm (int sig){

   isdelay_countdown = 0;

   signal (sig, catch_alarm);

}
     vol = data->vol;
                 if(data->playbackdelay > 0){
                     /* Establish a handler for SIGALRM signals.  */

                     signal (SIGALRM, catch_alarm);
                      isdelay_countdown = 1;
                       /* Call alarm to countdown length of

playbackdelay  */

                       alarm ((int)data->playbackdelay);
                       /* Check the flag once in a while to see when to

quit.  */

                       while(isdelay_countdown){

                         looperdata_set_vol(data,0);

                         data->isplaying = 0;

                      }
                 }
/* return to start of loop */
                     looperdata_set_vol(data,vol);

                     data->isplaying = 1;

                     data->playindex += data->loopstart - data->loopend;
--

Patrick Shirkey

Boost Hardware Ltd
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