relaxes asrc to not flip flop bang bang; use pyalsaaudio for dante.

src/auracast/multicast.py

@@ -206,7 +206,7 @@ class PyAlsaAudioInput(audio_io.ThreadedAudioInput):
             length, data = self._pcm.read_sw(frame_size + self._bang_bang)
             avail = self._pcm.avail()
             SETPOINT = 120 
-            TOLERANCE = 40 
+            TOLERANCE = 80 
             if avail < SETPOINT - TOLERANCE:
                 self._bang_bang = -1 
             elif avail > SETPOINT + TOLERANCE:
@@ -811,7 +811,11 @@ class Streamer():
                     if input_format == 'auto':
                         raise ValueError('input format details required for alsa input')
                     pcm = audio_io.PcmFormat.from_str(input_format)
-                    audio_input = AlsaArecordAudioInput(audio_source[5:], pcm)
+                    device_name = audio_source[5:]
+                    if device_name.startswith('dante_'):
+                        audio_input = PyAlsaAudioInput(device_name, pcm)
+                    else:
+                        audio_input = AlsaArecordAudioInput(device_name, pcm)
                 else:
                     audio_input = await audio_io.create_audio_input(audio_source, input_format)
                 # Store early so stop_streaming can close even if open() fails