cyclesink.py

#!/bin/env python
#
# cyclesink sets all audio sources (sink inputs) to the same next
# sink in PulseAudio. PulseAudio sets newly created sink inputs to
# use the sink that was last assigned to, so all sources should always
# be using the same output unless the configuration is changed elsewhere.

import os

def get_sinks():
    stream = os.popen('pactl list short sinks')
    output = stream.read()
    sinks = []
    for sink in output.splitlines():
        sink_no = sink.split()[0]
        sink_name = sink.split()[1]
        sinks.append({
            'no': sink_no,
            'name': sink_name,
            })
    return sinks

def get_streams():
    stream = os.popen('pactl list short sink-inputs')
    output = stream.read()
    streams = []
    for stream in output.splitlines():
        stream_no = stream.split()[0]
        sink_no = stream.split()[1]
        streams.append({
            'no': stream_no,
            'sink': sink_no,
            })
    return streams

streams = get_streams()
sinks = get_sinks()
if len(streams) == 0:
    print('no streams')
    exit(0)

if len(sinks) == 0:
    print('no sinks')
    exit(0)

# if only one sink, just set all streams to it

cur = streams[0]['sink']
idx = 0
for i, sink in enumerate(sinks):
    if sink['no'] == cur:
        print('found sink idx:', i)
        idx = i
        break

nxt = sinks[(idx+1)%len(sinks)]

for stream in streams:
    print('setting {} to {}'.format(stream['no'], nxt['no']))
    os.popen('pactl move-sink-input {} {}'.format(stream['no'], nxt['no']))