Hi experts

I have some more beginner questions about jack API.

Long time ago i writed lil test program - sine signal generator with OSS output and TUI level indicators.

http://martini.pudele.com/radio/demos/sin_gen-01.c

It is possible with (curses-ansi escapes) TUI vary sine parameters - Frequency and amplitude.

 

Program is so structured :

 

int  main ( int argc, char *argv[] ) 

{

  open_sound_device();

    for(;;)

    { 

        // calc sine wave here

        status = write(audio_fd,audio_buffer,BUFFA_SIZE*2);

 

    } // for;;

 

  close_sound_device();

} // main

 

Is it possible this program __as_is__ rewrite for jack output ?

Sine values do no multiple with 32767.0 
and instead of

  open_sound_device();

  write(audio_fd,audio_buffer,BUFFA_SIZE*2);

  close_sound_device();

just call jack stuff ?

 

====

 

Anyway - What is best (thread?, IPC?) program, structure, realtime-safe,

for such simple jack-TUI program ?

 

====

 

Normal 16 bit sound samples must be in range

-0x8000 ... +0xFFFF  or dec  -32768 ... +32767 signed short

but jack server works with samples normalized -1.0 ... +1.0 float

 

(1/32768) x 32767 = 0.999969482

 

Must be jack final output samples clipped in range

-1.0 ... +0.999969482  ?

If not, does jack clip anything to -1.0 and +0.999969482 ?

 

Tnx in advace @ all
Alfs Kurmis






----