linuxaudio.org

Hi experts I followed your discussion about=

 JACK API tutorial.Actually i am beginner_from_zero in JACK prog=

ramming. Long long time ago i writed small JACK =

client, but i gotta problems withx-runs and lost connections, an=

d i not unterstood why. Even if i read all this =

stuff, without tutorial and step_by_step examplesi can not progr=

amming stable JACK client.http://jackaudio.org/files/docs/html/g=

roup__ClientFunctions.html I found example =

https://github.com/harryhaaren/Linux-Audio-Programming-Documenta=

tion/blob/master/jackClient/jackClient.cppbut i have some beginn=

er questions about it. Why it is written in C++ =

, not C ?  float* inputBuffer =3D (float*)j=

ack_port_get_buffer ( inputPort , nframes); float* outputBu=

ffer=3D (float*)jack_port_get_buffer ( outputPort, nframes);mean=

s "read" and "write" ? If so then why callback f=

uncprocess(jack_nframes_t nframes  )have such st=

ructure ??INPUT_READOUTPUT_WRITEPROCESSING=

 ?  float* inputBuffer =3D (float*)jack_por=

t_get_buffer ( inputPort , nframes); float* outputBuffer=3D=

 (float*)jack_port_get_buffer ( outputPort, nframes);  for =

( i =3D 0; i < (int) nframes; i++)  { // copy data from =

input to output. Note this is not optimized for speed!  &#1=

60; outputBuffer[i] =3D inputBuffer[i];  }It mea=

ns that processed samples will go to output only @ next process() call ? Why not INPUT_READPROCE=

SSINGOUTPUT_WRITE ? How can i de=

tect (list) - all available ports:channels ?How to automatic con=

nect my client i/o ports to jackd ?  jack_l=

sp -tsystem:capture_1	32 bit float mono audiosystem:c=

apture_2	32 bit float mono audiosystem:playback_1	32 bit float m=

ono audiosystem:playback_2	32 bit float mono audio&#1=

60; What means - 32 bit float mono audio ?=

32 bit float - does JACK work with other sample formats ?mo=

no  - is it possible operate with interleaved stereo stream ?audio - what else as audio ? What about stereo=

 stream ?Must i create 2 ports ausL and ausR ? <=

/div>  outputPort =3D jack_port_register ( client,&#16=

0;                     &#=

160;             "ausL",  &#1=

60;                     &=

#160;           JACK_DEFAULT_AUDIO_TYPE,                    &#16=

0;               JackPortIsOutput,=

                    =

                0 );&#16=

0; outputPort =3D jack_port_register ( client,    &#16=

0;                     &#=

160;         "ausR",      &#1=

60;                     &=

#160;       JACK_DEFAULT_AUDIO_TYPE,   =

                     &#16=

0;           JackPortIsOutput,  &#=

160;                     =

            0 );If so, then how to=

 write data and sync both seperate(d) channels?With interleaved =

stream i do not care about sync between channels. Tnx in advance @ all.Alfs Kurmis <=

br />  > Which leads me to my next que=

stion:  are most JACK applications > written in C/C++?  I understa=

nd that programming as close to the > hardware as possible is impo=

rtant for performance, but what about > programming in a JVM langu=

age (I have Clojure in mind)?  How > reasonable is that?    ----