;Written by Iain McCurdy, 2006

;THE freeverb OPCODE IS PLACED IN A SEPARATE, ALWAYS ON, INSTRUMENT FROM THE SOURCE SOUND PRODUCING INSTRUMENT.
;THE IS A COMMONLY USED TECHNIQUE WITH TIME SMEARING OPCODES AND EFFECTS LIKE REVERBS AND DELAYS.


;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 Browser for audio file and use of FilePlay2 udo, now accept mono or stereo wav files
;	Add init instrument


;Reverb structure:

;			       +----+
;			     +-|comb|-+
;			     | +----+ |
;			     |        |
;			     | +----+ |
;			     +-|comb|-+
;			     | +----+ |
;			     |        |
;			     | +----+ |
;			     +-|comb|-+
;			     | +----+ |
;			     +        +
;			     | +----+ |
;			     +-|comb|-+
;			     | +----+ | +-------+ +-------+ +-------+ +-------+
;			IN-->|        |-|allpass|-|allpass|-|allpass|-|allpass|-->OUT
;			     | +----+ | +-------+ +-------+ +-------+ +-------+
;			     +-|comb|-+
;			     | +----+ |
;			     |        |
;			     | +----+ |
;			     +-|comb|-+
;			     | +----+ |
;			     |        |
;			     | +----+ |
;			     +-|comb|-+
;			     | +----+ |
;			     |        |
;			     | +----+ |
;			     +-|comb|-+
;			       +----+


;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	= 100		;NUMBER OF AUDIO SAMPLES IN EACH CONTROL CYCLE
nchnls	= 2			;NUMBER OF CHANNELS (2=STEREO)
0dbfs	= 1			;MAXIMUM SOUND INTENSITY LEVEL REGARDLESS OF BIT DEPTH


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	10	;GUI
	ktrig	metro	10
	if (ktrig == 1)	then
		gkingain		invalue	"LiveGain"
		gkRoomSize	invalue	"RoomSize"
		gkHFDamp		invalue	"HFDamping"
		gkmix		invalue	"Mix"
		gkskip		invalue	"Init"
		gkinput		invalue	"Input"
	endif
endin

instr	1	;PLAYS FILE AND OUTPUTS GLOBAL VARIABLES
	if	gkinput==0	then									;IF FILE INPUT IS SELECTED...
		Sfile		invalue	"_Browse1"
		gasigL, gasigR	FilePlay2	Sfile, 1, 0, 1					;GENERATE 2 AUDIO SIGNALS FROM A SOUND FILE (NOTE THE USE OF GLOBAL VARIABLES)		
	else													;OTHERWISE
		asigL, asigR	ins									;TAKE INPUT FROM COMPUTER'S AUDIO INPUT
		gasigL	=	asigL * gkingain						;SCALE USING 'Input Gain' SLIDER
		gasigR	=	asigR * gkingain						;SCALE USING 'Input Gain' SLIDER
	endif												;END OF CONDITIONAL BRANCHING
endin

instr	2	;REVERB - ALWAYS ON
	kSwitch	changed	gkskip												;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 kSwitch=1 THEN
		reinit	UPDATE													;BEGIN A REINITIALIZATION PASS FROM LABEL 'UPDATE'
	endif																;END OF CONDITIONAL BRANCHING
	UPDATE:																;A LABEL
				denorm	gasigL, gasigR										;DENORMALIZE BOTH CHANNELS OF AUDIO SIGNAL
	arvbL, arvbR	freeverb	gasigL, gasigR, gkRoomSize, gkHFDamp , sr, i(gkskip)
				rireturn													;RETURN TO PERFORMANCE TIME PASSES
	amixL		ntrpol	gasigL, arvbL, gkmix								;CREATE A DRY/WET MIX BETWEEN THE DRY AND THE REVERBERATED SIGNAL
	amixR		ntrpol	gasigR, arvbR, gkmix								;CREATE A DRY/WET MIX BETWEEN THE DRY AND THE REVERBERATED SIGNAL
				outs		amixL, amixR
				clear	gasigL, gasigR										;CLEAR GLOBAL AUDIO VARIABLES
endin

instr	11	;INIT
		outvalue	"RoomSize"	, .5
		outvalue	"HFDamping"	, .5
		outvalue	"Mix"		, .5
endin
</CsInstruments>
<CsScore>
;INSTR | START | DURATION
i 10		0.0	   3600	;GUI
i  2		0.0	   3600	;REVERB INSTRUMENT PLAYS FOR 1 HOUR (AND KEEPS PERFORMANCE GOING)
i 11		0.0		0.1	;INIT
</CsScore>
</CsoundSynthesizer>
<bsbPanel>
 <label>Widgets</label>
 <objectName/>
 <x>543</x>
 <y>229</y>
 <width>822</width>
 <height>378</height>
 <visible>true</visible>
 <uuid/>
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  <uuid>{aa607456-d368-4d59-8497-d16d608404c3}</uuid>
  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <label>freeverb</label>
  <alignment>center</alignment>
  <font>Liberation Sans</font>
  <fontsize>18</fontsize>
  <precision>3</precision>
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   <r>0</r>
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  <bordermode>border</bordermode>
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  <borderwidth>2</borderwidth>
 </bsbObject>
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  <objectName/>
  <x>8</x>
  <y>10</y>
  <width>100</width>
  <height>30</height>
  <uuid>{487d5181-d838-4cce-9628-317fefc350cb}</uuid>
  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <type>event</type>
  <pressedValue>1.00000000</pressedValue>
  <stringvalue/>
  <text>   ON / OFF</text>
  <image>/</image>
  <eventLine>i 1 0 -1</eventLine>
  <latch>true</latch>
  <latched>false</latched>
 </bsbObject>
 <bsbObject version="2" type="BSBLabel">
  <objectName/>
  <x>8</x>
  <y>72</y>
  <width>120</width>
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  <uuid>{0200a063-5db8-4668-bc2d-2d989a083f6e}</uuid>
  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <label>Live input Gain</label>
  <alignment>left</alignment>
  <font>Liberation Sans</font>
  <fontsize>10</fontsize>
  <precision>3</precision>
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   <r>0</r>
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  </color>
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   <r>255</r>
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  </bgcolor>
  <bordermode>noborder</bordermode>
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  <borderwidth>1</borderwidth>
 </bsbObject>
 <bsbObject version="2" type="BSBDisplay">
  <objectName>LiveGain</objectName>
  <x>448</x>
  <y>72</y>
  <width>60</width>
  <height>30</height>
  <uuid>{ab191e3a-430d-4f1d-88aa-9840342cd2d3}</uuid>
  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <label>0.130</label>
  <alignment>right</alignment>
  <font>Liberation Sans</font>
  <fontsize>9</fontsize>
  <precision>3</precision>
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   <r>0</r>
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  </color>
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   <r>255</r>
   <g>255</g>
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  <visible>true</visible>
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  <midicc>0</midicc>
  <label>freeverb</label>
  <alignment>center</alignment>
  <font>Liberation Sans</font>
  <fontsize>18</fontsize>
  <precision>3</precision>
  <color>
   <r>0</r>
   <g>0</g>
   <b>0</b>
  </color>
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   <r>158</r>
   <g>220</g>
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  </bgcolor>
  <bordermode>border</bordermode>
  <borderradius>5</borderradius>
  <borderwidth>2</borderwidth>
 </bsbObject>
 <bsbObject version="2" type="BSBLabel">
  <objectName/>
  <x>519</x>
  <y>22</y>
  <width>295</width>
  <height>351</height>
  <uuid>{d4bdb5ce-87d8-4c8c-9c64-40ec2eed6f5a}</uuid>
  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <label>-----------------------------------------------------------------------
freeverb is a Csound implementation of Jezar's Freeverb reverb plugin effect. This algorithm uses 8 parallel comb filters followed by 4 series allpass filters (as show below). The opcode is stereo and this algorithm is applied separately on both channels. The comb and allpass filters on the right channel are detuned with respect to those on the left in order to create a stereo effect. Input arguments include room size and high frequency damping. Optional arguments are for a value defining the expected sample rate (default=44100) and an optional 2-way switch is provided, if non-zero initialisation will, whenever possible, be skipped.
In this example the user can choose between a sound file input or the computer's live input. An input gain control on the live input is also provided.</label>
  <alignment>left</alignment>
  <font>Liberation Sans</font>
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   <r>0</r>
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  </color>
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 </bsbObject>
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  <uuid>{9b81a1f2-bcb8-4582-925b-9ae56def3865}</uuid>
  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <bsbDropdownItemList>
   <bsbDropdownItem>
    <name>Audio File</name>
    <value>0</value>
    <stringvalue/>
   </bsbDropdownItem>
   <bsbDropdownItem>
    <name> Live Input</name>
    <value>1</value>
    <stringvalue/>
   </bsbDropdownItem>
  </bsbDropdownItemList>
  <selectedIndex>0</selectedIndex>
  <randomizable group="0">false</randomizable>
 </bsbObject>
 <bsbObject version="2" type="BSBLabel">
  <objectName/>
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  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <label>Input</label>
  <alignment>right</alignment>
  <font>Arial</font>
  <fontsize>10</fontsize>
  <precision>3</precision>
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   <r>0</r>
   <g>0</g>
   <b>0</b>
  </color>
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  </bgcolor>
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  <borderradius>1</borderradius>
  <borderwidth>1</borderwidth>
 </bsbObject>
 <bsbObject version="2" type="BSBButton">
  <objectName>_Browse1</objectName>
  <x>8</x>
  <y>311</y>
  <width>170</width>
  <height>30</height>
  <uuid>{9b992da1-8c0f-449e-af03-7913cc05efed}</uuid>
  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <type>value</type>
  <pressedValue>1.00000000</pressedValue>
  <stringvalue>808loop.wav</stringvalue>
  <text>Browse Audio File</text>
  <image>/</image>
  <eventLine/>
  <latch>false</latch>
  <latched>false</latched>
 </bsbObject>
 <bsbObject version="2" type="BSBLineEdit">
  <objectName>_Browse1</objectName>
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  <height>28</height>
  <uuid>{15a8ec14-710f-43e6-be9e-f5dc8c8786cb}</uuid>
  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <label>808loop.wav</label>
  <alignment>left</alignment>
  <font>Arial</font>
  <fontsize>10</fontsize>
  <precision>3</precision>
  <color>
   <r>0</r>
   <g>0</g>
   <b>0</b>
  </color>
  <bgcolor mode="nobackground">
   <r>229</r>
   <g>229</g>
   <b>229</b>
  </bgcolor>
  <background>nobackground</background>
 </bsbObject>
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  <objectName/>
  <x>180</x>
  <y>341</y>
  <width>330</width>
  <height>34</height>
  <uuid>{a63909ac-6fa4-41c8-a84b-ba08e76132ab}</uuid>
  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <label>Restart the instrument after changing the audio file.</label>
  <alignment>left</alignment>
  <font>Liberation Sans</font>
  <fontsize>12</fontsize>
  <precision>3</precision>
  <color>
   <r>0</r>
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  <borderwidth>1</borderwidth>
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  <uuid>{2a8dc6e2-12f4-443d-af9b-59e4373cc24b}</uuid>
  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <minimum>0.00000000</minimum>
  <maximum>1.00000000</maximum>
  <value>0.13000000</value>
  <mode>lin</mode>
  <mouseControl act="jump">continuous</mouseControl>
  <resolution>-1.00000000</resolution>
  <randomizable group="0">false</randomizable>
 </bsbObject>
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  <objectName/>
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  <visible>true</visible>
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  <label>Room Size</label>
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  <uuid>{b0ad1916-b43e-44c2-be40-bca29f5cb1f4}</uuid>
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  <midicc>0</midicc>
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  <maximum>1.00000000</maximum>
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  <mouseControl act="jump">continuous</mouseControl>
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 </bsbObject>
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  <objectName/>
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  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
  <label>High Frequency Damping</label>
  <alignment>left</alignment>
  <font>Liberation Sans</font>
  <fontsize>10</fontsize>
  <precision>3</precision>
  <color>
   <r>0</r>
   <g>0</g>
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  </color>
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 </bsbObject>
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  <visible>true</visible>
  <midichan>0</midichan>
  <midicc>0</midicc>
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  <maximum>1.00000000</maximum>
  <value>0.50000000</value>
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  <visible>true</visible>
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  <midicc>0</midicc>
  <label>Dry / Wet Mix</label>
  <alignment>left</alignment>
  <font>Liberation Sans</font>
  <fontsize>10</fontsize>
  <precision>3</precision>
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   <r>0</r>
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  <objectName>Mix</objectName>
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