;Written by Iain McCurdy, 2006


;Modified for QuteCsound by René, April 2011
;Tested on Ubuntu 10.04 with csound-float 5.13.0 and QuteCsound svn rev 817

;Notes on modifications from original csd:
;	Add table(s) for exp slider
;	Add Browser for audio file and use of FilePlay2 udo, now accept mono or stereo wav files


;my flags on Ubuntu: -iadc -odac -b1024 -B2048 -+rtaudio=alsa -+rtmidi=null -m0
<CsoundSynthesizer>
<CsOptions>
--env:SSDIR+=../../SourceMaterials
</CsOptions>
<CsInstruments>
sr		= 44100	;SAMPLE RATE
ksmps	= 32	;NUMBER OF AUDIO SAMPLES IN EACH CONTROL CYCLE
nchnls	= 2		;NUMBER OF CHANNELS (2=STEREO)
0dbfs	= 1		;MAXIMUM AMPLITUDE REGARDLESS OF BIT DEPTH


giExp1	ftgen	0, 0, 129, -25, 0, 20.0, 128, 10000.0		;TABLE FOR EXP SLIDER


opcode FilePlay2, aa, Skoo		; Credit to Joachim Heintz
	;gives stereo output regardless your soundfile is mono or stereo
	Sfil, kspeed, iskip, iloop	xin
	ichn		filenchnls	Sfil
	if ichn == 1 then
		aL		diskin2	Sfil, kspeed, iskip, iloop
		aR		=		aL
	else
		aL, aR	diskin2	Sfil, kspeed, iskip, iloop
	endif
		xout		aL, aR
endop

instr	1	;GUI & INPUT
;GUI
	ktrig	metro	10
	if (ktrig == 1)	then
		kingain		invalue	"InputGain"
		kfr			invalue	"Frequency"
		gkfr			tablei	kfr, giExp1, 1
					outvalue	"Frequency_Value", gkfr
		gkfdbgain		invalue	"Feedback"
		gkamp		invalue	"Amplitude"
		kinput		invalue	"Input"

		Sfile_new		strcpy	""							;INIT TO EMPTY STRING
		Sfile		invalue	"_Browse"
		Sfile_old		strcpyk	Sfile_new
		Sfile_new		strcpyk	Sfile
		kfile 		strcmpk	Sfile_new, Sfile_old
	endif
;INPUT
	if	kinput==0		then									;IF INPUT 'Audio File' IS SELECTED...
		kNew_file		changed	kfile						;GENERATE A MOMENTARY '1' PULSE IN OUTPUT 'kSwitch' IF ANY OF THE SCANNED INPUT VARIABLES CHANGE. (OUTPUT 'kSwitch' IS NORMALLY ZERO)
		if	kNew_file=1	then								;IF I-RATE VARIABLE CHANGE TRIGGER IS '1'...
			reinit	NEW_FILE								;BEGIN A REINITIALISATION PASS FROM LABEL 'NEW_FILE'
		endif
		NEW_FILE:
		gasigL, gasigR	FilePlay2	Sfile, 1, 0, 1					;GENERATE 2 AUDIO SIGNALS FROM A SOUND FILE	
					rireturn
	elseif	kinput==1	then									;IF INPUT 'Live' IS SELECTED...
		asigL, asigR	ins									;TAKE INPUT FROM COMPUTER'S AUDIO INPUT
		gasigL	=	asigL * kingain						;SCALE USING 'Input Gain' SLIDER
		gasigR	=	asigR * kingain						;SCALE USING 'Input Gain' SLIDER
	else													;OTHERWISE...
		kint		random	0.1,0.4							;INTERVAL BETWEEN IMPULSES IS RANDOMISED SLIGHTLY
		a1		mpulse	4,kint							;GENERATE IMPULSES
		kcfoct	randomi	6,12,2							;GENERATE RANDOM VALUES FOR FILTER CUTOFF FREQUENCY (OCT FORMAT)
		gasigL	butlp	a1, cpsoct(kcfoct)					;LOWPASS FILTER STREAM OF CLICKS
		gasigR	=		gasigL							;SET RIGHT CHANNEL SIGNAL TO THE SAME AS THE LEFT CHANNEL SIGNAL
	endif
endin

instr	2
	kSwitch		changed	gkfdbgain							;GENERATE A MOMENTARY '1' PULSE IN OUTPUT 'kSwitch' IF ANY OF THE SCANNED INPUT VARIABLES CHANGE. (OUTPUT 'kSwitch' IS NORMALLY ZERO)
	if	kSwitch=1	then										;IF I-RATE VARIABLE CHANGE TRIGGER IS '1'...
		reinit	UPDATE									;BEGIN A REINITIALISATION PASS FROM LABEL 'UPDATE'
	endif
	UPDATE:
	aresL 		streson	gasigL, gkfr, i(gkfdbgain)
	aresR 		streson	gasigR, gkfr, i(gkfdbgain)
				rireturn									;RETURN FROM REINITIALISATION PASS TO PERFORMANCE TIME PASSES
				outs		aresL * gkamp, aresR * gkamp			;SEND streson OUTPUT TO THE AUDIO OUTPUTS AND SCALE USING THE GUI SLIDER VARIABLE gkamp
				clear	gasigL, gasigR						;CLEAR GLOBAL AUDIO VARIABLES
endin
</CsInstruments>
<CsScore>
i  1 0	3600		;GUI
</CsScore>
</CsoundSynthesizer>


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  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <label>streson</label>
  <alignment>center</alignment>
  <font>Liberation Sans</font>
  <fontsize>18</fontsize>
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   <r>0</r>
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  <objectName/>
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  <visible>true</visible>
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  <midicc>0</midicc>
  <label>Live Input Gain</label>
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  <mouseControl act="jump">continuous</mouseControl>
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  <randomizable group="0">false</randomizable>
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  <type>event</type>
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  <stringvalue/>
  <text>  On / Off</text>
  <image>/</image>
  <eventLine>i 2 0 -1</eventLine>
  <latch>true</latch>
  <latched>false</latched>
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  <label>streson</label>
  <alignment>center</alignment>
  <font>Liberation Sans</font>
  <fontsize>18</fontsize>
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  <label>-------------------------------------------------------------------------------------------------------------------------
Streson implements a sympathetic string resonating-type filter using comb, lowpass and allpass filter in an algorithm similar to that of the Karplus-Strong plucked string model. Streson's audible output is similar to that of the 'wguide1' opcode. One difference is that 'Feedback' is variable only at i-rate in streson. 'Feedback' is expressed as a ratio of the entire signal. A value of 0 means that none of the signal will be fed back into the system, a value of 1 means that all of the signal will be fed back into the system. The use of feedback can create dramatic rises in output amplitude, therefore in this example I have included a slider that controls output amplitude.
Note that tuning inaccuracies are increasingly exhibited as 'Frequency' is increased. If precise tuning is required then it will probably not be suffucient to rely on the value given for 'Frequency' and instead this should be checked by ear. In this example the user can choose between a sound file input, the computer's live input or a stream of click impulses. The risk of feedback is greatly increased through the use of streson processing so for this reason a gain control on the live input, which is initially zero, is included. Use with caution! It might actually be better to monitor through headphones to further reduce the risk of feedback when using the live input.</label>
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  <visible>true</visible>
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  <bsbDropdownItemList>
   <bsbDropdownItem>
    <name>Audio File</name>
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    <name>Live Input</name>
    <value>1</value>
    <stringvalue/>
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    <name>Impulses</name>
    <value>2</value>
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  <borderradius>1</borderradius>
  <borderwidth>1</borderwidth>
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  <objectName>_Browse</objectName>
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  <midicc>0</midicc>
  <type>value</type>
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  <text>Browse Audio File</text>
  <image>/</image>
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  <latched>false</latched>
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  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <label>Feedback Gain (i-rate)</label>
  <alignment>left</alignment>
  <font>Liberation Sans</font>
  <fontsize>10</fontsize>
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 </bsbObject>
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  <visible>true</visible>
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  <label>Output Amplitude Scaling</label>
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