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Markov Experiment 2 (Original Csound Edition)
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| Markov Experiment II | |
| Jacob Joaquin | |
| July 6, 2010 | |
| jacobjoaquin@gmail.com | |
| csoundblog.com | |
| <CsoundSynthesizer> | |
| <CsInstruments> | |
| sr = 44100 | |
| kr = 44100 | |
| ksmps = 1 | |
| nchnls = 1 | |
| 0dbfs = 1 | |
| ; Instruments | |
| # define Start # 1 # | |
| # define Stop # 2 # | |
| # define State_0 # 3 # | |
| # define State_1 # 4 # | |
| # define State_2 # 5 # | |
| # define State_3 # 6 # | |
| # define State_4 # 7 # | |
| # define State_5 # 8 # | |
| # define State_6 # 9 # | |
| # define State_7 # 10 # | |
| # define TriPunch # 11 # | |
| # define BoomPlayer # 12 # | |
| # define Boom # 13 # | |
| ; Tables | |
| ; Waveforms | |
| # define t_sin # 1 # | |
| # define t_tri # 2 # | |
| ; State Odds | |
| # define S_0 # 3 # | |
| # define S_1 # 4 # | |
| # define S_2 # 5 # | |
| # define S_3 # 6 # | |
| # define S_4 # 7 # | |
| # define S_5 # 8 # | |
| # define S_6 # 9 # | |
| # define S_7 # 10 # | |
| ; Dependencies | |
| # define WeightedRandomFn # 11 # | |
| ; Table | |
| itemp ftgen $t_sin, 0, 2 ^ 16, 10, 1 | |
| itemp ftgen $t_tri, 0, 2 ^ 16, -7, 0, 2 ^ 14, 1, 2 ^ 15, -1, 2 ^ 14, 0 | |
| ; Connect state nodes | |
| gitemp ftgen $S_0, 0, -2, -2, $State_1, 1 | |
| gitemp ftgen $S_1, 0, -4, -2, $State_0, 1, $State_2, 1 | |
| gitemp ftgen $S_2, 0, -4, -2, $State_0, 1, $State_3, 1 | |
| gitemp ftgen $S_3, 0, -6, -2, $State_0, 1, $State_3, 4, $State_4, 1 | |
| gitemp ftgen $S_4, 0, -2, -2, $State_5, 1 | |
| gitemp ftgen $S_5, 0, -4, -2, $State_4, 1, $State_6, 2 | |
| gitemp ftgen $S_6, 0, -4, -2, $State_4, 1, $State_7, 2 | |
| gitemp ftgen $S_7, 0, -6, -2, $State_4, 1, $State_7, 4, $State_0, 2 | |
| ; Different every time | |
| seed 0 | |
| opcode WeightedRandom, i, i | |
| ifn xin ; Table of ordered (element, weight) pairs | |
| isize = ftlen(ifn) | |
| isize_2 = int(isize / 2) | |
| iweight_fn ftgen $WeightedRandomFn, 0, isize_2 * -1, -2, 0 | |
| iweight_total init 0 | |
| ; Get elements and weights | |
| i_index init 0 | |
| start_loop: | |
| iweight tab_i i_index * 2 + 1, ifn | |
| iweight_total = iweight_total + iweight | |
| tabw_i iweight_total, i_index, iweight_fn | |
| loop_lt i_index, 1, isize_2, start_loop | |
| ; Choose element based on weighted values | |
| i_index = 0 | |
| irandom random 0, iweight_total | |
| start_loop_2: | |
| ival tab_i i_index, iweight_fn | |
| if irandom < ival igoto end | |
| i_index = i_index + 1 | |
| igoto start_loop_2 | |
| end: | |
| ielement tab_i i_index * 2, ifn ; Get element | |
| xout ielement ; Return randomly selected element | |
| ftfree iweight_fn, 0 ; Free table | |
| endop | |
| opcode SelectState, i, iiiiS | |
| istate_fn, \ ; Table storing weighted odds | |
| inext, \ ; Time until next note | |
| itempo, \ ; Tempo ratio | |
| iamp, \ ; Amplitude | |
| Sid xin | |
| itime_left chnget Sid | |
| itime_left = itime_left - inext | |
| if itime_left >= 0 then | |
| chnset itime_left, Sid | |
| istate WeightedRandom istate_fn | |
| Sevent sprintf {{i %d %f %f %f "%s"}}, istate, inext * itempo, \ | |
| itempo, iamp, Sid | |
| scoreline_i Sevent | |
| endif | |
| xout 1 | |
| endop | |
| instr $Start | |
| itempo = p3 ; Tempo | |
| idur = p4 ; Duration in beats | |
| iamp = p5 ; Amplitude | |
| Sid = p6 ; String identifier of running Markov chain | |
| p3 = idur * itempo ; Duration in seconds | |
| ; Begin Markov chain | |
| Sevent sprintf {{i %d 0 %f %f "%s"}}, $State_0, itempo, iamp, Sid | |
| scoreline_i Sevent | |
| ; Create a bus to track remaining time | |
| istatus = 1 | |
| chn_k Sid, 3 | |
| chnset idur, Sid | |
| turnoff | |
| endin | |
| instr $State_0 | |
| itempo = p3 ; Tempo in seconds per beat | |
| iamp = p4 ; Amplitude | |
| Sid = p5 ; Markov process ID | |
| inext = 1 ; Duration of of note | |
| ifreq = cpspch(8.00) ; Frequency | |
| ;Trigger note | |
| event "i", $TriPunch, 0, itempo, inext, iamp, ifreq | |
| ; Select next state | |
| itemp SelectState $S_0, inext, itempo, iamp, Sid | |
| turnoff | |
| endin | |
| instr $State_1 | |
| itempo = p3 ; Tempo in seconds per beat | |
| iamp = p4 ; Amplitude | |
| Sid = p5 ; Markov process ID | |
| inext = 0.5 ; Duration of of note | |
| ifreq = cpspch(8.02) ; Frequency | |
| ;Trigger note | |
| event "i", $TriPunch, 0, itempo, inext, iamp, ifreq | |
| ; Select next state | |
| itemp SelectState $S_1, inext, itempo, iamp, Sid | |
| turnoff | |
| endin | |
| instr $State_2 | |
| itempo = p3 ; Tempo in seconds per beat | |
| iamp = p4 ; Amplitude | |
| Sid = p5 ; Markov process ID | |
| inext = 1 ; Duration of of note | |
| ifreq = cpspch(8.03) ; Frequency | |
| ;Trigger note | |
| event "i", $TriPunch, 0, itempo, inext, iamp, ifreq | |
| ; Select next state | |
| itemp SelectState $S_2, inext, itempo, iamp, Sid | |
| turnoff | |
| endin | |
| instr $State_3 | |
| itempo = p3 ; Tempo in seconds per beat | |
| iamp = p4 ; Amplitude | |
| Sid = p5 ; Markov process ID | |
| inext = 0.5 ; Duration of of note | |
| ifreq = cpspch(8.05) ; Frequency | |
| ;Trigger note | |
| event "i", $TriPunch, 0, itempo, inext, iamp, ifreq | |
| ; Select next state | |
| itemp SelectState $S_3, inext, itempo, iamp, Sid | |
| turnoff | |
| endin | |
| instr $State_4 | |
| itempo = p3 ; Tempo in seconds per beat | |
| iamp = p4 ; Amplitude | |
| Sid = p5 ; Markov process ID | |
| inext = 1 ; Duration of of note | |
| ifreq = cpspch(8.07) ; Frequency | |
| ;Trigger note | |
| event "i", $TriPunch, 0, itempo, inext, iamp, ifreq | |
| ; Select next state | |
| itemp SelectState $S_4, inext, itempo, iamp, Sid | |
| turnoff | |
| endin | |
| instr $State_5 | |
| itempo = p3 ; Tempo in seconds per beat | |
| iamp = p4 ; Amplitude | |
| Sid = p5 ; Markov process ID | |
| inext = 1.5 ; Duration of of note | |
| ifreq = cpspch(8.10) ; Frequency | |
| ;Trigger note | |
| event "i", $TriPunch, 0, itempo, inext, iamp, ifreq | |
| ; Select next state | |
| itemp SelectState $S_5, inext, itempo, iamp, Sid | |
| turnoff | |
| endin | |
| instr $State_6 | |
| itempo = p3 ; Tempo in seconds per beat | |
| iamp = p4 ; Amplitude | |
| Sid = p5 ; Markov process ID | |
| inext = 1 ; Duration of of note | |
| ifreq = cpspch(8.09) ; Frequency | |
| ;Trigger note | |
| event "i", $TriPunch, 0, itempo, inext, iamp, ifreq | |
| ; Select next state | |
| itemp SelectState $S_6, inext, itempo, iamp, Sid | |
| turnoff | |
| endin | |
| instr $State_7 | |
| itempo = p3 ; Tempo in seconds per beat | |
| iamp = p4 ; Amplitude | |
| Sid = p5 ; Markov process ID | |
| inext = 0.5 ; Duration of of note | |
| ifreq = cpspch(9.00) ; Frequency | |
| ;Trigger note | |
| event "i", $TriPunch, 0, itempo, inext, iamp, ifreq | |
| ; Select next state | |
| itemp SelectState $S_7, inext, itempo, iamp, Sid | |
| turnoff | |
| endin | |
| instr $TriPunch | |
| itempo = p3 ; Tempo in seconds per beat | |
| idur = p4 * itempo ; Duration in seconds | |
| iamp = p5 ; Amplitude | |
| ifreq = p6 ; Frequency | |
| p3 = idur ; Modify play time from beats to seconds | |
| iattack = 0.06 | |
| irandom random 0.995, 1.005 | |
| a1 oscil iamp, ifreq * irandom, $t_tri | |
| a2 linseg 1, iattack, 0.1, idur - iattack, 0 | |
| out a1 * a2 | |
| endin | |
| instr $BoomPlayer | |
| itempo = p3 | |
| ibeats = p4 | |
| iamp = p5 | |
| event "i", $Boom, 0, 1, iamp | |
| ; Trigger self | |
| ibeats = ibeats - 1 | |
| if ibeats > 0 then | |
| event "i", $BoomPlayer, itempo, itempo, ibeats, iamp | |
| endif | |
| turnoff | |
| endin | |
| instr $Boom | |
| p3 = 0.125 | |
| idur = p3 | |
| iamp = p4 | |
| a3 line 131, idur, 60 | |
| a1 oscil iamp, a3, $t_sin | |
| a2 line 1, idur, 0 | |
| out a1 * a2 | |
| endin | |
| </CsInstruments> | |
| <CsScore> | |
| ; Instruments | |
| # define Start # 1 # | |
| # define Stop # 2 # | |
| # define State_0 # 3 # | |
| # define State_1 # 4 # | |
| # define State_2 # 5 # | |
| # define State_3 # 6 # | |
| # define State_4 # 7 # | |
| # define State_5 # 8 # | |
| # define State_6 # 9 # | |
| # define State_7 # 10 # | |
| # define TriPunch # 11 # | |
| # define BoomPlayer # 12 # | |
| # define Boom # 13 # | |
| t 0 133 | |
| i $Start 0 1 128 0.4 "process_1" | |
| i $BoomPlayer 0 1 128 0.4 | |
| e 128 | |
| </CsScore> | |
| </CsoundSynthesizer> |
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