From c3853f6dd796615f332fefcaaaf563794d867ee4 Mon Sep 17 00:00:00 2001
From: Richard Knight <q@1bpm.net>
Date: Tue, 17 Mar 2020 18:47:36 +0000
Subject: initial

---
 examples/toCheck/7-sqlite-pitchmatcher.csd | 140 +++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 examples/toCheck/7-sqlite-pitchmatcher.csd

(limited to 'examples/toCheck/7-sqlite-pitchmatcher.csd')

diff --git a/examples/toCheck/7-sqlite-pitchmatcher.csd b/examples/toCheck/7-sqlite-pitchmatcher.csd
new file mode 100644
index 0000000..1d45234
--- /dev/null
+++ b/examples/toCheck/7-sqlite-pitchmatcher.csd
@@ -0,0 +1,140 @@
+<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>
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