I took a very quick look at your code. In your function inicjuj_PCM() you pass the address of an snd_pcm_t object as *pcm_handle, and then you pass the address of that to snd_pcm_open() as &pcm_handle. This may be a cause of your problem, since the actual address of the pointer itself (not the contents) is not available. You need to change your code to pas a snd_pcm_t** to inicjuj_PCM() and then just pass that along unmodified to snd_pcm_open(). Then you need to fix the rest of your code to deal with the double-indirection of pcm_handle. The reason for this is that the ALSA functions may modify the value of the pointer address and there is no way to do that as you have written it. Hence, the core dump / segfault.

Happy to help and glad that this did the trick. Post more questions when you have coding problems. I've been programming in C and C++ for about 30 years now. I've made most of the possible errors one can make already... :-)

woboyle wrote:

Happy to help and glad that this did the trick. Post more questions when you have coding problems. I've been programming in C and C++ for about 30 years now. I've made most of the possible errors one can make already... :-)

That sentence might get you in trouble: I'm learning C++ and Qt right now. ;)