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'''
Copyright (c) 2018 Modul 9/HiFiBerry
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
'''
import time
import logging
import select
import tempfile
import os
from threading import Thread
from hifiberrydsp.hardware.adau145x import Adau145x
from hifiberrydsp.filtering.volume import percent2amplification, amplification2percent
from hifiberrydsp import datatools
from hifiberrydsp.hardware.spi import SpiHandler
DIRECTION_TO_DSP = 1
DIRECTION_TO_ALSA = 2
DIRECTION_TWO_WAY = 3
ALSA_STATE_FILE = """
state.sndrpihifiberry {
control.99 {
iface MIXER
name %VOLUME%
value.0 255
value.1 255
comment {
access 'read write user'
type INTEGER
count 2
range '0 - 255'
tlv '0000000100000008ffffdcc400000023'
dbmin -9020
dbmax -95
dbvalue.0 -95
dbvalue.1 -95
}
}
}
"""
class AlsaSync(Thread):
'''
Synchronises a dummy ALSA mixer control with a volume control
register of the DSP.
'''
def __init__(self):
self.alsa_control = None
self.volume_register = None
self.dsp = Adau145x
self.volume_register_length = self.dsp.WORD_LENGTH
self.finished = False
self.pollinterval = 1000 # milliseconds
self.spi = SpiHandler
self.dspdata = None
self.dspvol = None
self.alsavol = None
self.softvol = None
self.mixername = None
Thread.__init__(self)
def set_volume_register(self, volume_register):
logging.debug("Using volume register %s", volume_register)
self.volume_register = volume_register
# When setting a new Volume register, always update ALSA to
# state of the DSP
self.read_dsp_data()
self.update_alsa(self.dspvol)
def set_alsa_control(self, alsa_control):
from alsaaudio import Mixer
self.mixer = self.get_dsp_mixer(alsa_control)
if self.mixer != None:
logging.debug("using existing ALSA control %s", alsa_control)
else:
try:
logging.debug(
"ALSA control %s does not exist, creating it", alsa_control)
self.mixer = self.create_mixer(alsa_control)
except Exception as e:
logging.error(
"can't create ALSA mixer control %s (%s)",
alsa_control, e)
return False
if self.mixer == None:
logging.error("ALSA mixer %s not found", alsa_control)
return False
self.mixername = alsa_control
return True
def update_alsa(self, value, mixer=None):
if value is None:
return
from alsaaudio import MIXER_CHANNEL_ALL
vol = round(value)
if mixer is None:
mixer = self.mixer
if mixer is not None:
mixer.setvolume(vol, MIXER_CHANNEL_ALL)
self.alsavol = vol
def update_dsp(self, value):
if value is None:
return
# convert percent to multiplier
logging.debug("Updating DSP to %s",value)
volume = percent2amplification(value)
# write multiplier to DSP
dspdata = datatools.int_data(self.dsp.decimal_repr(volume),
self.volume_register_length)
self.spi.write(self.volume_register, dspdata)
self.dspdata = dspdata
self.dspvol = value
def read_alsa_data(self):
from alsaaudio import Mixer
volumes = self.get_dsp_mixer(self.mixername).getvolume()
channels = 0
vol = 0
for i in range(len(volumes)):
channels += 1
vol += volumes[i]
if channels > 0:
vol = round(vol / channels)
if vol != self.alsavol:
logging.debug(
"ALSA volume changed from {}% to {}%".format(self.alsavol, vol))
self.alsavol = vol
return True
else:
return False
def read_dsp_data(self):
if self.volume_register is None:
self.dspdata = None
self.dspvol = None
return False
dspdata = self.spi.read(
self.volume_register, self.volume_register_length)
if dspdata != self.dspdata:
# Convert to percent and round to full percent
vol = round(amplification2percent(self.dsp.decimal_val(dspdata)))
if vol < 0:
vol = 0
elif vol > 100:
vol = 100
logging.debug(
"DSP volume changed from {}% to {}%".format(self.dspvol, vol))
self.dspvol = vol
self.dspdata = dspdata
return True
else:
return False
def get_dsp_mixer(self, mixername):
import alsaaudio
find_card = True
i=0
while(find_card):
try:
mixers = alsaaudio.mixers(cardindex=i)
if [match for match in mixers if mixername in match]:
hw_dev = "hw:{0}".format(str(i))
return alsaaudio.Mixer(mixername,device=hw_dev)
except:
find_card = False
i+=1
return None
def check_sync(self):
alsa_changed = self.read_alsa_data()
dsp_changed = self.read_dsp_data()
# Check if one of the control has changed and update the other
# one. If both have changed, ALSA takes precedence
if alsa_changed:
logging.debug("Updating DSP volume from ALSA")
self.update_dsp(self.alsavol)
elif dsp_changed:
logging.debug("Updating ALSA volume from DSP")
self.update_alsa(self.dspvol)
def run(self):
reg_set = True
try:
while not(self.finished):
if self.mixer is None:
logging.error(
"ALSA mixer not available, aborting volume synchronisation")
break
if self.volume_register is None:
# Volume control register can change when a new program is
# uploaded, just go on and try again later
if reg_set:
logging.error(
"ALSA mixer not available, volume register unknown in profile")
reg_set = False
time.sleep(1)
continue
else:
reg_set = True
poller = select.poll()
poller.register(*(self.mixer.polldescriptors()[0]))
poller.poll(self.pollinterval)
self.mixer.handleevents()
self.check_sync()
except Exception as e:
logging.error("ALSA sync crashed: %s", e)
def finish(self):
self.finished = True
@staticmethod
def create_mixer(name):
with tempfile.NamedTemporaryFile(mode='w', dir="/tmp", delete=False) as asoundstate:
content = ALSA_STATE_FILE.replace("%VOLUME%", name)
logging.debug("asoundstate file %s", content)
asoundstate.write(content)
asoundstate.close()
command = "/usr/sbin/alsactl -f {} restore".format(
asoundstate.name)
logging.debug("runnning %s", command)
os.system(command)
try:
from alsaaudio import Mixer, mixers
logging.info("mixers: ", mixers())
return Mixer(name)
except:
from alsaaudio import cards, ALSAAudioError
raise ALSAAudioError("Mixer {} not found (cards: {})".format(name, cards()))
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