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/4-postgresql-analysis.csd | 104 +++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 examples/4-postgresql-analysis.csd

(limited to 'examples/4-postgresql-analysis.csd')

diff --git a/examples/4-postgresql-analysis.csd b/examples/4-postgresql-analysis.csd
new file mode 100644
index 0000000..38a82a6
--- /dev/null
+++ b/examples/4-postgresql-analysis.csd
@@ -0,0 +1,104 @@
+<CsoundSynthesizer>
+<CsOptions>
+-odac
+</CsOptions>
+<CsInstruments>
+/*
+	EXAMPLE 4
+
+	Pitch track an oscillator, inserting the time, frequency and amplitude values in a PostgreSQL database 
+	as fast as it will accept, at k-rate.
+	Read back the values at i-rate in the db_play instrument and create events to mimic the original oscillator.
+	
+
+*/
+
+sr = 44100
+kr = 4410
+nchnls = 2
+0dbfs = 1
+seed 0
+
+
+; connect: type, hostname or IP, database name, username, password
+gidb dbconnect "postgresql", "localhost", "databasename", "username", "password"
+
+
+; create table if it doesn't exist. truncate if it does
+instr start_example
+	kdone1 dbexec_k gidb, "CREATE TABLE IF NOT EXISTS analysis (time FLOAT, rms FLOAT, freq FLOAT)", -1
+	kdone2 dbexec_k gidb, "TRUNCATE TABLE analysis", kdone1
+
+	; schedule next steps
+	if (kdone2 == 1) then
+		schedule "db_analyse", 0, 3
+		schedule "db_play", 3.5, 3.5
+		turnoff
+	endif
+endin
+
+
+instr db_analyse
+	
+	; the oscillator
+	a1 oscil abs(oscil(1, 0.6)), linseg(440, p3*0.2, 800, p3*0.2, 220, p3*0.2, 220, p3*0.2, 350, p3*0.2, 440)
+
+	; pitch/rms and time tracking
+	kcps, krms pitchamdf a1, 220, 800, 0, 0
+	ktime timeinsts 
+
+	; listen back to the pitch track output
+	a1 oscil krms, kcps
+
+	; insert the time, rms and frequency values as fast as the database will accept
+	kdone init 1
+	kdone dbexec_k gidb, sprintfk("INSERT INTO analysis (time, rms, freq) VALUES (%f, %f, %f)", ktime, krms, kcps), 1
+	
+	; declick end
+	aout = a1 * linseg(1, p3*0.99, 1, p3*0.01, 0)
+	outs aout, aout
+endin
+
+
+instr db_play
+
+	; get all of the values
+	idata[][] dbarray gidb, "SELECT time, rms, freq FROM analysis"
+	
+	; loop through 
+	index = 0
+	while (index < lenarray(idata)) do
+	
+		; set the duration to be the time to the next row multiplied by an overlap
+		if (index == lenarray(idata) - 1) then
+			iduration = 1
+		else	
+			iduration = (idata[index+1][0] - idata[index][0]) * 3.2
+		endif
+	
+		; create the event accordingly
+		event_i "i", "oscillator", idata[index][0]*2, iduration, idata[index][1], idata[index][2]
+		index += 1
+	od
+endin
+
+
+instr oscillator
+
+	; basic oscillator
+	iamp = p4
+	ifreq = p5
+	a1 oscil iamp * 0.5, ifreq
+	
+	; envelope to try and take away the quantised type sound
+	aout = a1 * linseg(0, p3*0.45, 1, p3*0.1, 1, p3*0.45, 0)
+	outs aout, aout
+endin
+
+</CsInstruments>
+<CsScore>
+i "start_example" 0 7
+
+
+</CsScore>
+</CsoundSynthesizer>
\ No newline at end of file
-- 
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