[Stk] Segfault in SineWave.h

[Stephen Sinclair]

Ah yes, your problem is in the 'fuckit' variable, which is causing the
computer to feel insulted and sulk at you. ;)

No just kidding.

Your problem is likely that you are spawning a thread which just opens
an RtAudio stream and then waits in a while(1){} loop, eating up the
CPU for no reason.  You actually don't really need to create your own
thread here.  You should just call openStream, startStream, and then
your tick() function will automatically get called by the operating
system's audio API.  In cases where a thread is needed for this
(depends on which audio system / operating system), RtAudio will
create it for you.

As for why it's crashing, I'm looking for other places in the program
that access the "struct args_struct" pointed to by 'fuckit', but I
don't see any, so I don't see any conflicts.

I do notice that you've commented out the definition of "struct
args_struct", so it is possible that you've defined it a bit
differently somewhere in a header file?  If that's the case it might
just be that your object files have gotten out of date and some other
bits of your program are trying to access a slight different layout of
"args_struct"; if so, you just need to "rm *.o" and recompile
everything.  Just a guess though.

If not, you'll have to come up with a more "minimal" example of a
crashing program that you can post to the list if you want help.  We
can't help you if we can't duplicate the problem.

Steve

On Mon, Jan 10, 2011 at 9:39 AM, Janosch.rux <janosch.rux at web.de> wrote:
> Thats the whole main.cpp:
>
>     http://pastebin.com/aeGsNz06
>
> Regards
>
> On 10.01.2011 01:15, Tristan Matthews wrote:
>
> 2011/1/7 Janosch.rux <janosch.rux at web.de>
>>
>> I tried to extract the relevant parts. The whole code is a hand tracking
>> example for the kinect device. In my opinion this is really messy but
>> actually I don't know how I could solve this in a more elegant way.
>>
>> Thanks for your reply
>>
>> Janosch Rux
>>
>> See also: http://pastebin.com/7smzrQ02
>>
>> ###### Definition of args_struct
>>
>> struct args_struct {
>>         stk::SineWave *sine;
>>         XnVPointDrawer *point;
>> };
>>
>>
>> #######Call in main.cpp:
>>
>>         args_stk.point = g_pDrawer;
>>
>>         //sound init get pointer to drawer
>>         status = pthread_create(&sig, NULL, audio, (void *)&args_stk);
>>         if(status != 0) {
>>                 printf("Can't create thread\n");
>>                 exit(EXIT_FAILURE);
>>         }
>>
>>         pthread_detach(sig);
>
>
> Could you show the rest of main.cpp? It's possible that args_stk is going
> out of scope.
>
> -t
>
>>
>> ######## the thread function to init the stk
>>
>> void *audio(void *arg) {
>>
>>   RtAudio dac;
>>  struct args_struct *fuckit = (args_struct *) arg;
>>   fuckit->sine = new SineWave;
>>
>>   // Figure out how many bytes in an StkFloat and setup the RtAudio
>> stream.
>>   RtAudio::StreamParameters parameters;
>>   parameters.deviceId = dac.getDefaultOutputDevice();
>>   parameters.nChannels = 1;
>>   RtAudioFormat format = ( sizeof(StkFloat) == 8 ) ? RTAUDIO_FLOAT64 :
>> RTAUDIO_FLOAT32;
>>   unsigned int bufferFrames = RT_BUFFER_SIZE;
>>
>>
>>   try {
>>     dac.openStream( &parameters, NULL, format, (unsigned
>> int)Stk::sampleRate(), &bufferFrames, &tick, (void *)fuckit);
>>   }
>>   catch ( RtError &error ) {
>>     error.printMessage();
>>     exit(EXIT_FAILURE);
>>   }
>>
>>   fuckit->sine->setFrequency(440.0);
>>
>>   try {
>>     dac.startStream();
>>   }
>>   catch ( RtError &error ) {
>>     error.printMessage();
>>     exit(EXIT_FAILURE);
>>   }
>>
>>         while(1) {}
>>
>>         return 0;
>> }
>>
>> ###### the tick() function
>>
>> int tick( void *outputBuffer, void *inputBuffer, unsigned int
>> nBufferFrames,
>>  double streamTime, RtAudioStreamStatus status, void *dataPointer )
>> {
>>
>> struct args_struct *fuckit = (args_struct *)dataPointer;
>> register StkFloat *samples = (StkFloat *) outputBuffer;
>> fuckit->sine->setFrequency(fuckit->point->get_stk_freq());
>>
>> //printf("Freq: %i\n", fuckit->point->get_stk_freq());
>>
>>   for ( unsigned int i=0; i<nBufferFrames; i++ ) {
>>                 *samples++ = fuckit->sine->tick();
>>         }
>>
>>   return 0;
>> }
>>
>>
>> On 07.01.2011 20:47, Tristan Matthews wrote:
>>
>> 2011/1/7 Janosch.rux <janosch.rux at web.de>
>>>
>>> Hi,
>>>
>>> I use stk with callbacks to enhance another piece of software. Stk is
>>> encapsulated in its own thread. If the tick function calls the sine->tick()
>>> as in the example (https://ccrma.stanford.edu/software/stk/crealtime.html)
>>> on the web page I get a segfault on line 116 in SineWave.h.
>>>
>>> Im not quite sure whether this is a bug or mistake on my side.
>>
>> Could you provide your code (or at least the relevant part)? Without
>> seeing it, we can only hazard a guess as to what is going wrong.
>>
>> -t
>>
>>>
>>> Thanks for any suggestions.
>>>
>>> Regards
>>>
>>> Janosch Rux
>>>
>>> _______________________________________________
>>> Stk mailing list
>>> Stk at ccrma.stanford.edu
>>> http://ccrma-mail.stanford.edu/mailman/listinfo/stk
>>>
>>
>>
>>
>> --
>> Tristan Matthews
>> email: tristan at sat.qc.ca
>> web: http://tristanswork.blogspot.com
>>
>>
>> _______________________________________________
>> Stk mailing list
>> Stk at ccrma.stanford.edu
>> http://ccrma-mail.stanford.edu/mailman/listinfo/stk
>>
>
>
>
> --
> Tristan Matthews
> email: tristan at sat.qc.ca
> web: http://tristanswork.blogspot.com
>
>
> _______________________________________________
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> http://ccrma-mail.stanford.edu/mailman/listinfo/stk
>
>