324 lines
8.6 KiB
Python
324 lines
8.6 KiB
Python
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import math
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import json
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import array
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import types
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import matplotlib.pyplot as plt
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import numpy as np
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import wt_util
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def sign(x):
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return x<0
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def find_zero_crossing( xV, si, inc ):
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# find the next zero crossing before/after si
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while si > 0:
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if sign(xV[si-1])==False and sign(xV[si])==True:
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break;
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si += inc
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return si
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def table_read_2( tab, frac ):
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i0 = math.floor(frac + 1)
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i1 = i0 + 1
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f = frac - int(frac)
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return tab[i0] + (tab[i1] - tab[i0]) * f
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def hann_read( x, N ):
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while x > N:
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x -= N
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x = x - (N/2)
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return (0.5 + 0.5 * math.cos(2*math.pi * x / N))
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def sine_0():
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srate = 48000.0
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hz = wt_util.midi_pitch_to_hz(6)
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fsmp_per_cyc = srate / hz # fractional samples per cycle
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fsmp_per_wt = 2* fsmp_per_cyc # fractional samples per wavetable
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smp_per_wt = int(math.floor(fsmp_per_wt)) # integer samples per wavetable
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# Note that when wrapping from the last sample to the first there is less
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# than one sample period and so the wavetable phase after the wrap will be fractional
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# fill two wave tables with two identical cycles of a sine signal
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wt0 = [0] + [ math.sin(2*math.pi*hz*i/srate) for i in range(smp_per_wt) ] + [0]
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wt1 = [0] + [ math.sin(2*math.pi*hz*i/srate) for i in range(smp_per_wt) ] + [0]
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xN = smp_per_wt * 4
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phs0 = 0
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phs1 = fsmp_per_wt/2
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y0 = []
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y1 = []
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y2 = []
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h0 = []
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h1 = []
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for i in range(xN):
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# read the wave tables
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s0 = table_read_2( wt0, phs0 )
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s1 = table_read_2( wt1, phs1 )
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y0.append( s0 )
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y1.append( s1 )
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# calc the envelopes
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e0 = hann_read(phs0,fsmp_per_wt)
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e1 = hann_read(phs1,fsmp_per_wt)
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h0.append( e0 )
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h1.append( e1 )
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# sum the two signals
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y2.append( e0*s0 + e1*s1 )
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# advance the phases of the oscillators
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phs0 += 1
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if phs0 >= smp_per_wt:
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phs0 -= smp_per_wt
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phs1 += 1
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if phs1 >= smp_per_wt:
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phs1 -= smp_per_wt
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fix,ax = plt.subplots(4,1)
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ax[0].plot(y0)
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ax[1].plot(y1)
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ax[2].plot(h0)
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ax[2].plot(h1)
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ax[3].plot(y2)
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plt.show()
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def piano_0():
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i_audio_fname = "/home/kevin/temp/wt1/wav/060_samples.wav"
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o_audio_fname = "/home/kevin/temp/temp.wav"
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marker_tsv_fname = "/home/kevin/temp/wt1/60_marker.txt"
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midi_pitch = 60
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offs_ms = 50
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note_dur_secs = 3
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inter_note_secs = 0.5
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markL = wt_util.parse_marker_file(marker_tsv_fname)
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aM,srate = wt_util.parse_audio_file(i_audio_fname)
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hz = wt_util.midi_pitch_to_hz(midi_pitch)
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fsmp_per_cyc = srate/hz
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fsmp_per_wt = fsmp_per_cyc * 2
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smp_per_wt = int(math.floor(fsmp_per_wt))
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offs_smp = int(math.floor(offs_ms * srate / 1000))
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ch_cnt = aM.shape[1]
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note_dur_smp = int(round(note_dur_secs*srate))
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inter_note_smp = int(round(inter_note_secs*srate))
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yN = len(markL) * (note_dur_smp + inter_note_smp)
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yM = np.zeros((yN,ch_cnt))
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yi = 0
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for beg_sec,end_sec,vel_label in markL:
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bsi = int(round(beg_sec * srate))
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esi = int(round(end_sec * srate))
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for ch_idx in range(ch_cnt):
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wtbi = find_zero_crossing(aM[:,ch_idx],esi-offs_smp,-1)
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wtei = wtbi + smp_per_wt
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wt = [0] + aM[wtbi:wtei,ch_idx].tolist() + [0]
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wt[0] = aM[wtei-1,ch_idx]
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wt[-1] = wt[1]
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atkN = wtbi - bsi
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yM[yi:yi+atkN,ch_idx] = aM[bsi:wtbi,ch_idx]
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phs0 = 0
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phs1 =fsmp_per_wt/2
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for i in range(note_dur_smp-atkN):
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s0 = table_read_2( wt, phs0 )
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s1 = table_read_2( wt, phs1 )
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e0 = hann_read(phs0,fsmp_per_wt)
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e1 = hann_read(phs1,fsmp_per_wt)
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# advance the phases of the oscillators
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phs0 += 1
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if phs0 >= smp_per_wt:
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phs0 -= smp_per_wt
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phs1 += 1
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if phs1 >= smp_per_wt:
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phs1 -= smp_per_wt
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yM[yi+atkN+i,ch_idx] = e0*s0 + e1*s1
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yi += note_dur_smp + inter_note_smp
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wt_util.write_audio_file( yM, srate, o_audio_fname )
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def select_wave_table( aV, si, smp_per_wt ):
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wtbi = find_zero_crossing(aV,si,-1)
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wtei = wtbi + smp_per_wt
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wt = [0] + aV[wtbi:wtei].tolist() + [0]
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wt[0] = aV[wtei-1]
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wt[-1] = wt[1]
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return wt,wtbi
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def piano_1():
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o_audio_fname = "/home/kevin/temp/temp.wav"
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o_mark_tsv_fname = "/home/kevin/temp/temp_mark.txt"
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if False:
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i_audio_fname = "/home/kevin/temp/wt1/wav/060_samples.wav"
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marker_tsv_fname = "/home/kevin/temp/wt1/60_marker.txt"
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midi_pitch = 60
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offs_0_ms = 100
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offs_1_ms = 50
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g_coeff = 0.9985
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if True:
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i_audio_fname = "/home/kevin/temp/wt3/wav/21_samples.wav"
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marker_tsv_fname = "/home/kevin/temp/wt3/21_marker.txt"
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midi_pitch = 21
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offs_0_ms = 100
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offs_1_ms = 80
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g_coeff = 0.9992
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note_dur_secs = 6
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inter_note_secs = 0.5
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markL = wt_util.parse_marker_file(marker_tsv_fname)
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aM,srate = wt_util.parse_audio_file(i_audio_fname)
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hz = wt_util.midi_pitch_to_hz(midi_pitch)
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fsmp_per_cyc = srate/hz
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fsmp_per_wt = fsmp_per_cyc * 2
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smp_per_wt = int(math.floor(fsmp_per_wt))
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offs_0_smp = int(math.floor(offs_0_ms * srate / 1000))
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offs_1_smp = int(math.floor(offs_1_ms * srate / 1000))
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ch_cnt = aM.shape[1]
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note_dur_smp = int(round(note_dur_secs*srate))
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inter_note_smp = int(round(inter_note_secs*srate))
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yN = len(markL) * (note_dur_smp + inter_note_smp)
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yM = np.zeros((yN,ch_cnt))
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yi = 0
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oMarkL = []
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for beg_sec,end_sec,vel_label in markL:
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bsi = int(round(beg_sec * srate))
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esi = int(round(end_sec * srate))
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for ch_idx in range(ch_cnt):
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wt0,wtbi = select_wave_table( aM[:,ch_idx], esi-offs_0_smp, smp_per_wt )
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wt1,_ = select_wave_table( aM[:,ch_idx], esi-offs_1_smp, smp_per_wt)
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rms0 = np.pow( np.mean( np.pow(wt0,2) ),0.5)
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rms1 = np.pow( np.mean( np.pow(wt1,2) ),0.5)
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wt1 = [ w*rms0/rms1 for w in wt1 ]
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# The attack abutts the wavetable at it's center point
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# so we need to offset the end of the attack half way
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# through the first wave table.
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abi = int(wtbi + smp_per_wt/2)
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atkN = abi - bsi
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yM[yi:yi+atkN,ch_idx] = aM[bsi:abi,ch_idx]
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oMarkL.append(((yi+atkN)/srate, (yi+atkN)/srate, f"{vel_label}-{ch_idx}"))
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phs0 = 0
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phs1 = fsmp_per_wt/2
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phs2 = fsmp_per_wt/4
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phs3 = fsmp_per_wt/4 + fsmp_per_wt/2
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g = 1.0
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g_phs = 0
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for i in range(note_dur_smp-atkN):
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s0 = table_read_2( wt0, phs0 )
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s1 = table_read_2( wt0, phs1 )
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s2 = table_read_2( wt1, phs2 )
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s3 = table_read_2( wt1, phs3 )
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e0 = hann_read(phs0,fsmp_per_wt)
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e1 = hann_read(phs1,fsmp_per_wt)
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e2 = hann_read(phs0,fsmp_per_wt)
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e3 = hann_read(phs1,fsmp_per_wt)
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# advance the phases of the oscillators
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phs0 += 1
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if phs0 >= smp_per_wt:
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phs0 -= smp_per_wt
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phs1 += 1
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if phs1 >= smp_per_wt:
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phs1 -= smp_per_wt
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phs2 += 1
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if phs2 >= smp_per_wt:
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phs2 -= smp_per_wt
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phs3 += 1
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if phs3 >= smp_per_wt:
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phs3 -= smp_per_wt
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mix_g = math.cos(0.25*2*math.pi*i/srate)
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#yM[yi+atkN+i,ch_idx] = g* (mix_g*(e0*s0 + e1*s1) + (1.0-mix_g)*(e2*s2 + e3*s3))
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yM[yi+atkN+i,ch_idx] = g* (e0*s0 + e1*s1)
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g_phs += 1
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if g_phs >= 64:
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g *= g_coeff
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g_phs = 0
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yi += note_dur_smp + inter_note_smp
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wt_util.write_audio_file( yM, srate, o_audio_fname )
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wt_util.write_mark_tsv_file(oMarkL, o_mark_tsv_fname)
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if __name__ == "__main__":
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#sine_0()
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piano_1()
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