src/app/synth.py

   1 # -*- coding: utf-8 -*-
   2 """
   3 module de wrapping du synthétiseur
   4
   5 $Id$
   6 $URL$
   7 """
   8 from os.path import realpath, sep, exists
   9 from  fluidsynth import Synth as FSynth
  10 from log import console, envLogger
  11 import pygame
  12 import events
  13
  14 class Synth(FSynth) :
  15     """
  16     Interface fluidsynth avec les adaptations suivantes :
  17     - la soundfont FluidR3_GM.sf2 est chargée par défaut
  18     - le constructeur démarre le synthé
  19     - octaviation
  20     """
  21
  22     def __init__(self, gain=0.2, samplerate=44100, sfPath='') :
  23         FSynth.__init__(self, gain=gain, samplerate=samplerate)
  24
  25         if not sfPath :
  26             sfPath = realpath(__file__).split(sep)
  27             sfPath = sfPath[:-1]
  28             sfPath.append('soundfonts')
  29
  30             sfPath.append('FluidR3_GM.sf2')
  31             sfPath = sep.join(sfPath)
  32
  33         assert exists(sfPath)
  34
  35         self.start()
  36         self.fsid = self.sfload(sfPath)
  37         self._octaveAjusts = {}
  38         console.info('démarrage du synthétiseur')
  39         envLogger.info('soundfont : %s', sfPath)
  40
  41     def __del__(self) :
  42         console.info('arrêt du synthétiseur')
  43         self.delete()
  44
  45     def adjust_octave(self, chan, octave) :
  46         '''
  47         Abaisse ou élève les notes de n octave
  48         '''
  49         self._octaveAjusts[chan] = octave
  50
  51     def sfunload(self, update_midi_preset=0):
  52         FSynth.sfunload(self, self.fsid, update_midi_preset=update_midi_preset)
  53
  54     def program_select(self, chan, bank, preset):
  55         FSynth.program_select(self, chan, self.fsid, bank, preset)
  56
  57     def sfont_select(self, chan):
  58         FSynth.sfont_select(self, chan, self.fsid)
  59
  60     def noteon(self, chan, key, vel):
  61         key = key + self._octaveAjusts.get(chan, 0) * 12
  62         FSynth.noteon(self, chan, key, vel)
  63         evt = pygame.event.Event(events.NOTEON, chan=chan, key=key, vel=vel)
  64         pygame.event.post(evt)
  65
  66     def noteoff(self, chan, key) :
  67         key = key + self._octaveAjusts.get(chan, 0) * 12
  68         FSynth.noteoff(self, chan, key)
  69         evt = pygame.event.Event(events.NOTEOFF, chan=chan, key=key)
  70         pygame.event.post(evt)