def chunked_frame_data(self, chunksize: int, repeat: bool=False,
stopcondition: Callable[[], bool]=lambda: False) -> Generator[memoryview, None, None]:
notes = itertools.cycle(self.title_music) if repeat else iter(self.title_music)
attack, decay, sustain, release = self.adsr_times
num_frames = chunksize // synth_params.norm_samplewidth // synth_params.norm_nchannels
sample_residue = Sample(None, nchannels=2)
for v1, v2 in notes:
if stopcondition():
break
vf1 = self.music_freq_table[v1]
vf2 = self.music_freq_table[v2]
osc1 = FastTriangle(vf1 * _sidfreq, amplitude=0.5)
osc2 = FastTriangle(vf2 * _sidfreq, amplitude=0.5)
f1 = EnvelopeFilter(osc1, attack, decay, sustain, 1.0, release, stop_at_end=True)
f2 = EnvelopeFilter(osc2, attack, decay, sustain, 1.0, release, stop_at_end=True)
sample1 = Sample.from_oscillator(f1, 1, synth_params.norm_samplerate) # length is max. 1 second
sample2 = Sample.from_oscillator(f2, 1, synth_params.norm_samplerate) # length is max. 1 second
sample_residue.join(sample1.stereo_mix(sample2, "R"))
while len(sample_residue) >= num_frames:
# TODO optimize this a bit by not using Samples but instead by looping over a memoryview of the frames (just like the super class does)
yield sample_residue.view_frame_data()[:chunksize]
sample_residue = Sample.from_raw_frames(sample_residue.view_frame_data()[chunksize:],
sample_residue.samplewidth, sample_residue.samplerate, sample_residue.nchannels)
if len(sample_residue):
yield sample_residue.view_frame_data()
def sample_from_osc(osc: Oscillator) -> Sample:
s = Sample.from_oscillator(osc, 5) # 5 seconds is the maximum it will be.
return s.stereo()
