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authorRichard Knight <q@1bpm.net>2020-03-17 19:06:18 +0000
committerRichard Knight <q@1bpm.net>2020-03-17 19:06:18 +0000
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parentc3853f6dd796615f332fefcaaaf563794d867ee4 (diff)
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-<CsoundSynthesizer>
-<CsOptions>
--odac
-</CsOptions>
-<CsInstruments>
-/*
- EXAMPLE 9
-
- A rudimentary pitch tracking concatenative resynthesizer
-
- This creates a sqlite database in memory, and then uses the opcode getpitches to scan through a
- sound file in non-realtime, storing detected pitches and the relevant offset time of the pitch in
- the database. The example file is a series of ascending piano notes.
-
- When done, the instrument "playmatches" is scheduled. This plays a descending oscillator
- which is pitch tracked and then a similar pitch is found from the database, prompting the "segment"
- instrument to be scheduled with the relevant offset.
- The result is that the piano notes/sound file segments picked should moreorless match what the
- oscillator is doing.
-
-*/
-
-sr = 44100
-kr = 4410
-nchnls = 2
-0dbfs = 1
-
-
-; create an in-memory sqlite database and create a table
-gidb dbconnect "sqlite", ":memory:"
-dbexec gidb, "CREATE TABLE pitches (time REAL, cps REAL)"
-
-; file of ascending piano pitches
-gSfile = "sounds/piano.wav"
-
-
-; detect pitches and insert time/cps to database given a filename, in non-realtime
-opcode getpitches, 0, S
- Sfile xin
- ktimek timeinstk
- ktime timeinsts
- klast init -1
- kcount init 0
-
- ; run in the first single k-rate cycle
- if (ktimek == 0) then
-
- ; get file length in k-cycles
- ilen filelen Sfile
- kcycles = ilen * kr
-loop:
- ; read file and track pitch
- ain diskin2 Sfile, 1
- koct, kamp pitch ain, 0.01, 7, 11, 6, 12, 10, 8
-
- ; only take action if pitch has changed
- kchanged changed2 koct
- if (kchanged == 1) then
-
- ; only store if cps is reasonably different from the last value
- kcps = cpsoct(koct)
- if (kcps > klast*1.1 || kcps < klast*0.9) then
-
- ; insert to database: the dbexec_kb opcode is k-rate but blocking/synchronous.
- ; simpler to use for the non-realtime operation as regular _k opcodes are threaded/asynchronous
- ktime = kcount / kr
- Squery sprintfk "INSERT INTO pitches (time, cps) VALUES (%f, %f)", ktime, kcps
- dbexec_kb gidb, Squery
- klast = kcps
- endif
- endif
- loop_lt kcount, 1, kcycles, loop
-
- endif
-endop
-
-
-
-; begin the example: find pitches and then schedule the next step
-instr start_example
- getpitches gSfile
- schedkwhen 1, 0, 0, "playmatches", 0, 20
- turnoff
-
-endin
-
-
-
-; pitch follow a descending oscillator and attempt to find a similar cps in the database, then schedule segment accordingly
-instr playmatches
- kdone init 0 ; for when the select query is done
- klast init 0 ; last pitch played, in order to avoid repeats
-
- ; descending oscillator
- k1 linseg 2000, p3, 200
- ain oscil 1, k1, 1
-
- ; track it
- koct, kamp pitch ain, 0.01, 7, 11, 6, 12, 10, 8
-
- ; only take action when the tracked pitch has changed
- kchanged changed2 koct
- if (kchanged == 1) then
-
- ; (very roughly) get a near frequency match from the database
- kcps = cpsoct(koct)
- Squery sprintfk "SELECT time FROM pitches WHERE cps >= %f LIMIT 1", kcps
- kdone, kpos dbscalar_k gidb, Squery, kchanged
-
- ; don't repeat notes (try the schedkwhen outside of the if block for continuous play)
- if (kpos != klast) then
- schedkwhen kdone, 0, 0, "segment", 0, 0.2, kpos
- klast = kpos
- endif
- endif
-
- ; uncomment to hear the oscillator as well as pitch matched output
- ;outs ain*0.01, ain*0.01
-endin
-
-
-
-; play part of the sound file given a skip time with a basic fade in/out
-instr segment
- iskip = p4
- kamp linseg 0, p3*0.1, 1, p3*0.8, 1, p3*0.1, 0
- a1 diskin2 gSfile, 1, iskip
- aout = a1*kamp * 0.1
- outs aout, aout
-endin
-
-
-</CsInstruments>
-<CsScore>
-f1 0 16384 10 1 0 0.3 0 0.2 0 0.14 0 .111 ; square wave
-
-i"start_example" 0 1
-
-</CsScore>
-</CsoundSynthesizer> \ No newline at end of file