LinuxMusicians

One more great input Jeff. Thank you. I will modify it as follows (some of it is already implemented) 1. Sample-rate and buffer-size will be variables (not constants). 2. Default values will be initiated as default hardcoded values or per user last manual settings (see hereafter). 3. User will be ab...

Hi Jeff, Wow, thank you so much for sharing your project. Most certainly it will take me days to get in and learn what and how you do it. Thanks. And now for the bottom line - I have resolved the issue :-) The fact that I get the JACK callback in a double rate was an issue I could not understand. I ...

I'm interested in knowing the rate as my code is a realtime synthesizer application (like FluidSynth), so next audio block is calculated/processed soon after the previous one is delivered to JACK and this new block is delivered to JACK at the next interval to keep delay to a minimum. I will look int...

Thanks for a very comprehensive and educating reply. Buffer size is indeed 512 samples and callbacks are generated every half-buffer time, yet, number of frames in each callback request i get is 512 and not 256. I have also put a trap inside the callback function looking for nframs != 512 -> always ...

Hi folderol. Thanks for your prompt reply. My apology, but not sure I understand your answer :roll: Do you mean that I get 2 callbacks for each buffer (period) and one is ignored by the Jack-server? What do you mean by "one or other is being silently adjusted"? (ignored?). Thanks, Nahum.

Hi, I'm using Jack API in a synthesizer c++ program I'm developing running on a Raspberry Pi 4. Sample rate is 44100 ( jackSampleRate = jack_get_sample_rate(client_out); ) Buffer size is set to 512 ( jack_set_buffer_size(client_out, _JACK_AUD_PERIOD_SIZE); ) (#define _JACK_AUD_PERIOD_SIZE 512). Calc...

Hi, I'm using Jack API in a synthesizer c++ program I'm developing running on a Raspberry Pi 4. Sample rate is 44100 ( jackSampleRate = jack_get_sample_rate(client_out); ) Buffer size is set to 512 ( jack_set_buffer_size(client_out, _JACK_AUD_PERIOD_SIZE); ) (#define _JACK_AUD_PERIOD_SIZE 512). Calc...

Issue resolved.
Embarrassed to let you all know that the issue was a short circuit in the audio cable........
But now it is OK. Full stereo separation
Nahum.

Hi, I'm developing a real time c++ sound synthesis application (currently running on a Raspi). It uses 2 Jack Audio output channels and works perfectly. The issue is that both channels are mapped as mono channels to both Left and Right sound card (USB) channels, while I want each to be routed to one...