''' 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()))