Search found 7 matches

by niyer
Fri Nov 10, 2017 10:33 am
Forum: Discussion and pointers
Topic: Tutorial 2 - Audio programming with gtkIOStream
Replies: 21
Views: 10873

Re: Tutorial 2 - Audio programming with gtkIOStream

I am using Flatmax Stereo soundcard with both gain knobs set to MAX. The Alsamixer Master gain is set to 0 dB and the playback capture is set to 100<>100 ( Max). On an unrelated matter, does your driver use DMA or interrupt method to transfer I2S data ? We do a bunch of processing and I would like t...
by niyer
Tue Nov 07, 2017 12:28 pm
Forum: Discussion and pointers
Topic: Tutorial 2 - Audio programming with gtkIOStream
Replies: 21
Views: 10873

Re: Tutorial 2 - Audio programming with gtkIOStream

My ~/.jackdrc file contains one line:

"/usr/bin/jackd -dalsa -dhw:0 -r44100 -p1024 -n2" .

Is this some how related to why I am seeing a loss of 7.3 dB between capture in and line out ?

Thanks,
Nathan
by niyer
Thu Nov 02, 2017 1:39 pm
Forum: Discussion and pointers
Topic: Tutorial 2 - Audio programming with gtkIOStream
Replies: 21
Views: 10873

Re: Tutorial 2 - Audio programming with gtkIOStream

Hi Matt, With both the gain knobs set to max, we are seeing about 7.3 dB loss in both channels. This was tested by running JackClient and arecord .. | aplay.. . Is this loss expected ? If so is there a way to bring the loss to 0 dB ? In AlsaMixer settings, the Master gain is set to 0 dB and the play...
by niyer
Sun Oct 22, 2017 6:40 am
Forum: Discussion and pointers
Topic: Tutorial 2 - Audio programming with gtkIOStream
Replies: 21
Views: 10873

Re: Tutorial 2 - Audio programming with gtkIOStream

Hi Matt,
Apologize for the delay. I just saw your reply.
I ended up using the .jackdrc file to change the sample rate. I used "qjackctl" to create that file and change the sample rate. It worked great.

Thank you.

Regards,
Nathan
by niyer
Thu Sep 14, 2017 2:21 pm
Forum: Discussion and pointers
Topic: Tutorial 3 - Audio programming with gtkIOStream
Replies: 3
Views: 3869

Re: Tutorial 3 - Audio programming with gtkIOStream

Hi Matt,
Yes, this was part of the tutorials. I followed tutorial 0 step by step and found that I had to do these two additional steps to make it work.
It is not a big deal, wanted to mention it so that it can help others.

Thanks,
Nathan
by niyer
Thu Sep 14, 2017 2:17 pm
Forum: Discussion and pointers
Topic: Tutorial 2 - Audio programming with gtkIOStream
Replies: 21
Views: 10873

Re: Tutorial 2 - Audio programming with gtkIOStream

Hi Matt, I have been using this board for the past few weeks and love it. Thanks for the in-depth tutorials. The sample rate (jackClient.getSampleRate()) is defaulting to 48000 samples per second. I would like to set it to 44100 samples per second as my input audio and processing is sampled at this ...
by niyer
Thu Aug 17, 2017 9:56 am
Forum: Discussion and pointers
Topic: Tutorial 3 - Audio programming with gtkIOStream
Replies: 3
Views: 3869

Re: Tutorial 3 - Audio programming with gtkIOStream

Thank you for the tutorials. They helped create a great starting point for my project and also helped test my hardware and software setup. The only two steps that I had to do in addition to your instructions was to install sox and GTK2. I used the sudo apt-get command to install them and got back on...