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#!/usr/bin/env python3
import os
from typing import Optional
from home.config import config
from home.audio import amixer
from home.media import MediaNodeServer, SoundRecordStorage, SoundRecorder
from home import http
# This script must be run as root as it runs arecord.
# Implements HTTP API for amixer and arecord.
# -------------------------------------------
def _amixer_control_response(control):
info = amixer.get(control)
caps = amixer.get_caps(control)
return http.ok({
'caps': caps,
'info': info
})
class SoundNodeServer(MediaNodeServer):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.get('/amixer/get-all/', self.amixer_get_all)
self.get('/amixer/get/{control}/', self.amixer_get)
self.get('/amixer/{op:mute|unmute|cap|nocap}/{control}/', self.amixer_set)
self.get('/amixer/{op:incr|decr}/{control}/', self.amixer_volume)
async def amixer_get_all(self, request: http.Request):
controls_info = amixer.get_all()
return self.ok(controls_info)
async def amixer_get(self, request: http.Request):
control = request.match_info['control']
if not amixer.has_control(control):
raise ValueError(f'invalid control: {control}')
return _amixer_control_response(control)
async def amixer_set(self, request: http.Request):
op = request.match_info['op']
control = request.match_info['control']
if not amixer.has_control(control):
raise ValueError(f'invalid control: {control}')
f = getattr(amixer, op)
f(control)
return _amixer_control_response(control)
async def amixer_volume(self, request: http.Request):
op = request.match_info['op']
control = request.match_info['control']
if not amixer.has_control(control):
raise ValueError(f'invalid control: {control}')
def get_step() -> Optional[int]:
if 'step' in request.query:
step = int(request.query['step'])
if not 1 <= step <= 50:
raise ValueError('invalid step value')
return step
return None
f = getattr(amixer, op)
f(control, step=get_step())
return _amixer_control_response(control)
if __name__ == '__main__':
if not os.getegid() == 0:
raise RuntimeError("Must be run as root.")
config.load_app('sound_node')
storage = SoundRecordStorage(config['node']['storage'])
recorder = SoundRecorder(storage=storage)
recorder.start_thread()
server = SoundNodeServer(recorder=recorder,
storage=storage,
addr=config.get_addr('node.listen'))
server.run()
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