From b2d0c97e0ca7b7eb0a7195ddbf263b9953171e66 Mon Sep 17 00:00:00 2001
From: Florian Jung <flo@thinkpad.(none)>
Date: Fri, 14 Jan 2011 13:38:54 +0100
Subject: Moved lfos and sample-and-hold in own source file

---
 synth/Makefile         |  2 +-
 synth/in_synth_cli.cpp | 40 ++++++++++++++++++++++++++
 synth/jack.cpp         | 37 ++----------------------
 synth/lfos.cpp         | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++
 synth/lfos.h           |  9 ++++++
 synth/main.cpp         | 22 ++-------------
 6 files changed, 132 insertions(+), 55 deletions(-)
 create mode 100644 synth/lfos.cpp
 create mode 100644 synth/lfos.h

(limited to 'synth')

diff --git a/synth/Makefile b/synth/Makefile
index 8109bc8..0db09da 100644
--- a/synth/Makefile
+++ b/synth/Makefile
@@ -3,7 +3,7 @@ CFLAGS=-Wall -g
 CXXFLAGS=$(CFLAGS)
 LDFLAGS=-lm `pkg-config --cflags --libs jack`
 
-OBJ=channel.o cli.o defines.o envelope.o filter.o globals.o jack.o load.o main.o note.o note_skel.o parser.o programs.o readwave.o util.o note_loader.o in_synth_cli.o communication.o shared_object_manager.o
+OBJ=channel.o cli.o defines.o envelope.o filter.o globals.o jack.o load.o main.o note.o note_skel.o parser.o programs.o readwave.o util.o note_loader.o in_synth_cli.o communication.o shared_object_manager.o lfos.o
 BIN=synth
 
 DEPENDFILE = .depend
diff --git a/synth/in_synth_cli.cpp b/synth/in_synth_cli.cpp
index dd9260f..ece806b 100644
--- a/synth/in_synth_cli.cpp
+++ b/synth/in_synth_cli.cpp
@@ -9,6 +9,7 @@
 #include "communication.h"
 #include "globals.h"
 #include "load.h"
+#include "lfos.h"
 
 using namespace std;
 
@@ -64,6 +65,18 @@ void lock_and_load_program(int prg_no, string file)
 	do_request(prg_no, false);
 }
 
+void lock_and_change_lfo(int lfo_no, float freq)
+{
+	do_request(-1, true);
+	
+	uninit_lfo(lfo_no);
+	lfo_freq_hz[lfo_no]=freq;
+	init_lfo(lfo_no);
+	
+	do_request(-1, false);
+}
+
+
 void do_in_synth_cli()
 {
 	string input;
@@ -470,6 +483,33 @@ void do_in_synth_cli()
 					cout << "error: channel-number must be one of 0.."<<N_CHANNELS-1<<endl;
 			}
 		}
+		else if ((command=="change_lfo") || (command=="lfo") || (command=="set_lfo"))
+		{
+			string freqstr, lfostr;
+			lfostr=trim_spaces(str_before(params,' ',params));
+			freqstr=trim_spaces(str_after(params,' ',""));
+			
+			if ((!isnum(lfostr)) || (lfostr==""))
+				cout << "error: expected lfo-number, found '"<<lfostr<<"'"<<endl;
+			else if (! (isfloat(freqstr)&&freqstr!=""))
+				cout << "error: expected frequency, found '"<<freqstr<<"'"<<endl;
+			else
+			{
+				num=atoi(lfostr.c_str());
+				if ((num>=0) && (num<N_LFOS))
+				{
+					float freq;
+					freq=atof(freqstr.c_str());
+					
+					if (freq>0)
+						lock_and_change_lfo(num,freq);
+					else
+						cout << "error: frequency must be a positive number"<<endl;
+				}
+				else
+					cout << "error: lfo-number must be one of 0.."<<N_LFOS-1<<endl;
+			}
+		}
 		else if (command!="")
 		{
 			cout << "error: unrecognized command '"<<command<<"'"<<endl;
diff --git a/synth/jack.cpp b/synth/jack.cpp
index fbf1ea0..d0a6169 100644
--- a/synth/jack.cpp
+++ b/synth/jack.cpp
@@ -10,6 +10,7 @@
 
 #include "jack.h"
 #include "communication.h"
+#include "lfos.h"
 
 using namespace std;
 
@@ -46,40 +47,6 @@ void process_request()
 
 
 
-void maybe_calc_stuff() //TODO woandershinschieben? lfo.cpp oder so?
-{
-	static int lfocnt=0;
-	static int snhcnt=0;
-	
-	if (lfocnt==0)
-	{
-		lfocnt=lfo_update_frames;
-		
-		for (int i=0;i<N_LFOS;i++)
-		{
-			lfo_phase[i]=(lfo_phase[i]+1)%lfo_res[i];
-			curr_lfo[i]=lfo[i][lfo_phase[i]];
-		}
-	}
-	
-	if (snhcnt==0)
-	{
-		snhcnt=sample_and_hold_frames;
-
-		//temp ranges between -ONE and ONE
-		fixed_t temp = (float(rand())/(RAND_MAX/2)  - 1.0) * ONE;
-		
-		for (int i=0;i<N_LFO_LEVELS;i++)
-			sample_and_hold[i]= temp*i/(N_LFO_LEVELS-1) + ONE;
-		
-		curr_lfo[SNH_LFO]=sample_and_hold;
-		// could be moved to some init function, but looks clearer and
-		// does not eat up the cpu too much ;)
-	}
-	
-	lfocnt--;
-	snhcnt--;
-}
 
 
 
@@ -479,7 +446,7 @@ int process_callback(jack_nframes_t nframes, void *notused)
 			}
 		}
 		
-		maybe_calc_stuff();
+		maybe_calc_lfos();
 
 		for (int j=0;j<N_CHANNELS;j++)
 		{
diff --git a/synth/lfos.cpp b/synth/lfos.cpp
new file mode 100644
index 0000000..5916937
--- /dev/null
+++ b/synth/lfos.cpp
@@ -0,0 +1,77 @@
+#include <math.h>
+#include <stdlib.h>
+
+#include "lfos.h"
+#include "globals.h"
+#include "fixed.h"
+#include "defines.h"
+
+void uninit_lfo(int i)
+{
+	if (lfo[i])
+	{
+		for (int j=0;j<lfo_res[i];j++)
+			delete [] lfo[i][j];
+		
+		delete [] lfo[i];
+		lfo[i]=NULL;
+	}
+}
+
+void init_lfo(int i)
+{
+	//two possible divisions by zero are avoided, because
+	//values <= 0 will make the program use the default
+	//(nonzero) values.
+	lfo_res[i]=samp_rate/lfo_freq_hz[i]/lfo_update_frames;
+
+	lfo[i]=new fixed_t* [lfo_res[i]];
+	for (int j=0;j<lfo_res[i];j++)
+	{
+		lfo[i][j]=new fixed_t [N_LFO_LEVELS];
+		float temp=sin(j*2.0*3.141592654/lfo_res[i]);
+		for (int k=0;k<N_LFO_LEVELS;k++)
+			lfo[i][j][k]= (1.0 + temp*(float(LFO_MAX)*k/N_LFO_LEVELS)) * ONE;
+	}
+
+}
+
+void init_snh()
+{
+	sample_and_hold_frames=samp_rate/snh_freq_hz;
+}
+
+void maybe_calc_lfos()
+{
+	static int lfocnt=0;
+	static int snhcnt=0;
+	
+	if (lfocnt==0)
+	{
+		lfocnt=lfo_update_frames;
+		
+		for (int i=0;i<N_LFOS;i++)
+		{
+			lfo_phase[i]=(lfo_phase[i]+1)%lfo_res[i];
+			curr_lfo[i]=lfo[i][lfo_phase[i]];
+		}
+	}
+	
+	if (snhcnt==0)
+	{
+		snhcnt=sample_and_hold_frames;
+
+		//temp ranges between -ONE and ONE
+		fixed_t temp = (float(rand())/(RAND_MAX/2)  - 1.0) * ONE;
+		
+		for (int i=0;i<N_LFO_LEVELS;i++)
+			sample_and_hold[i]= temp*i/(N_LFO_LEVELS-1) + ONE;
+		
+		curr_lfo[SNH_LFO]=sample_and_hold;
+		// could be moved to some init function, but looks clearer and
+		// does not eat up the cpu too much ;)
+	}
+	
+	lfocnt--;
+	snhcnt--;
+}
diff --git a/synth/lfos.h b/synth/lfos.h
new file mode 100644
index 0000000..e8e207b
--- /dev/null
+++ b/synth/lfos.h
@@ -0,0 +1,9 @@
+#ifndef __LFOS_H__
+#define __LFOS_H__
+
+void maybe_calc_lfos();
+void init_snh();
+void init_lfo(int i);
+void uninit_lfo(int i);
+
+#endif
diff --git a/synth/main.cpp b/synth/main.cpp
index 2aaf406..f4dcd54 100644
--- a/synth/main.cpp
+++ b/synth/main.cpp
@@ -14,6 +14,7 @@
 #include "in_synth_cli.h"
 #include "communication.h"
 #include "note_loader.h"
+#include "lfos.h"
 
 using namespace std;
 
@@ -77,28 +78,11 @@ int main(int argc, char** argv)
 
 		init_default_program(default_program);
 
-		//two possible divisions by zero are avoided, because
-		//values <= 0 will make the program use the default
-		//(nonzero) values.
-		for (i=0;i<N_LFOS;i++)
-			lfo_res[i]=samp_rate/lfo_freq_hz[i]/lfo_update_frames;
 
-		sample_and_hold_frames=samp_rate/snh_freq_hz;
-		
-		for (i=0;i<N_LFOS;i++)
-		{
-			lfo[i]=new fixed_t* [lfo_res[i]];
-			for (j=0;j<lfo_res[i];j++)
-				lfo[i][j]=new fixed_t [N_LFO_LEVELS];
-		}
+		init_snh();
 		
 		for (i=0;i<N_LFOS;i++)
-			for (j=0;j<lfo_res[i];j++)
-			{
-				float temp=sin(j*2.0*3.141592654/lfo_res[i]);
-				for (int k=0;k<N_LFO_LEVELS;k++)
-					lfo[i][j][k]= (1.0 + temp*(float(LFO_MAX)*k/N_LFO_LEVELS)) * ONE;
-			}
+			init_lfo(i);
 		
 		program_settings=new program_t[128];
 
-- 
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