auracaster/pyalsaaudio
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Better error logging and comments

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Lars Immisch
2023-05-31 20:00:16 +01:00
parent a66cf02a4c
commit e3ec2d1628
1 changed files with 19 additions and 5 deletions
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24
loopback.py
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@@ -46,8 +46,13 @@ class CaptureEvent(AlsaEvent):
if not size:
logging.warning(f'underrun')
return
written = self.playback.write(data)
logging.debug(f'{self.name} wrote {size}: {written}')
if not written:
# if this happened, we might push the data to a queue
logging.warning('overrun')
else:
logging.debug(f'{self.name} wrote {size}: {written}')
class VolumeEvent(AlsaEvent):
@@ -55,7 +60,6 @@ class VolumeEvent(AlsaEvent):
super().__init__(name, capture_control)
self.playback_control = playback_control
self.capture_control = capture_control
self.capture_control.getvolume(pcmtype=PCM_CAPTURE)
def handle_event(self, mask):
volume = self.capture_control.getvolume(pcmtype=PCM_CAPTURE)
@@ -92,14 +96,20 @@ class Reactor(object):
events = self.poll.poll()
for fd, ev in events:
handler = self.events[fd]
logging.debug(f'{handler.name}: {poll_desc(ev)} ({ev})')
# warn about unexpected/unhandled events
if ev & (select.POLLERR | select.POLLHUP | select.POLLNVAL | select.POLLRDHUP):
logging.warning(f'{handler.name}: {poll_desc(ev)} ({ev})')
else:
logging.debug(f'{handler.name}: {poll_desc(ev)} ({ev})')
handler.handle_event(ev)
if __name__ == '__main__':
logging.basicConfig(format='%(asctime)s %(message)s', level=logging.INFO)
parser = ArgumentParser(description='ALSA loopback')
parser = ArgumentParser(description='ALSA loopback (with volume forwarding)')
playback_pcms = pcms(pcmtype=PCM_PLAYBACK)
capture_pcms = pcms(pcmtype=PCM_CAPTURE)
@@ -143,6 +153,10 @@ if __name__ == '__main__':
reactor.register(capture_handler)
reactor.register(playback_handler)
# If args.input_mixer and args.output_mixer are set, forward the capture volume to the playback volume.
# The usecase is a capture device that is implemented using g_audio, i.e. the Linux USB gadget driver.
# When a USB device (eg. an iPad) is connected to this machine, its volume events will to the volume control
# of the output device
if args.input_mixer and args.output_mixer:
playback_control = Mixer(control=args.output_mixer, cardindex=playback.info()['card_no'])
capture_control = Mixer(control=args.input_mixer, cardindex=capture.info()['card_no'])
@@ -150,4 +164,4 @@ if __name__ == '__main__':
volume_handler = VolumeEvent('volume', capture_control, playback_control)
reactor.register(volume_handler, select.POLLIN)
reactor.run()
reactor.run()