Jan Homann wrote:
while(1) { sleep(1); snd_pcm_wait( pcm_handle, REC_BUFFER_ELEMENT_SIZE_MS + 10); snd_pcm_mmap_begin(pcm_handle, &my_areas, &offset, &frames); snd_pcm_avail_update ( pcm_handle ); snd_pcm_mmap_readi( pcm_handle, network_data.data_UC, ALSA_READ_FRAMES); snd_pcm_mmap_commit(pcm_handle, offset, frames); }
The sleep will result in an overrun, which will throw off the timing of all following calls.
You are not checking the return value of any of these functions.
Why are you calling snd_pcm_avail_update? And why are you doing this _after_ calling mmap_begin?
You are ignoring the number of frames returned by mmap_begin. This value could be smaller or larger than ALSA_READ_FRAMES.
Why are you using mmap in the first place, when you don't even try to access the buffer directly?
Regards, Clemens