I've been trying to figure out why I get no audio output on the Raspberry Pi and have found out that it seems to be related to threading.
After liberal sprinkling of qDebug() in the code to see what was happening and in what order things were called I figured out that the Modulator code was never run after pressing tune. The first press of the Tune button will lead to the call of Modulator::tune() but after that no code in Modulator was run. Repeated click on Tune would not result in the tune signal being processed by Modulator::tune. I then noticed that soundOutput, modulator, soundInput and detector were all moved to the m_audioThread in mainwindow.cpp. After some trial and error I found out that by not moving the m_modulator to the m_audioThread (commenting out m_modulator->moveToThread (&m_audioThread);) would "solve" the no-audio generated on Tune. I can now press Tune repeatedly and always get sound in my audio device. I don't know if this is a proper solution. Also, I can't find where the m_audioThread is constructed in the code. Adding an initializer for it to construct it in the MainWindow constructor does not help. Hope someone who knows the code better than me can help me in the right direction. This seems to be a threading issue, priorities and/or a locking issue? Thanks and 73 Hrafnkell TF3HR On Sun, Oct 29, 2023 at 8:44 PM Hrafnkell Eiriksson <h...@tf3hr.net> wrote: > Hi > > I recently installed wstjx 2.6.1 on a RPi4 running an up to date Bookworm > version of the Debian/RaspberryPI-OS. Wsjtx is installed from the > distribution repository. > > I am unable to get it to output audio from wsjtx. > > I've tried two different USB connected audio interfaces, a DigiRig mobile > and a Logitech PRO headset (that comes with a usb to 3.5mm jack adapter). > I've tried selecting default audio streams in the audio setup for output > and the specific card stream (e.g. hw:CARD=PRO,DEV=0). No audio is > generated when pressing the Tune button. > > I've used pavucontrol to monitor the audio sources generated and an output > stream is never set up for the wsjtx program. An input stream is visible in > the pavucontrol as "ALSA plug-in [wsjtx]" and audio input works fine. > > I've tried both the 64 and 32 bit versions of the Bookworm distribution > of RPiOS. > > Any help would be appreciated in figuring this out. > > Thanks and 73 > TF3HR Hrafnkell >
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