diff modules-and-plug-ins/max-external/btrack~.cpp @ 83:3b69082715ea

Merge branch 'release/1.0.2'

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules-and-plug-ins/max-external/btrack~.cpp	Tue Nov 25 23:00:13 2014 +0000
@@ -0,0 +1,383 @@
+//===========================================================================
+/** @file btrack~.cpp
+ *  @brief The btrack~ Max external
+ *  @author Adam Stark
+ *  @copyright Copyright (C) 2008-2014  Queen Mary University of London
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+//===========================================================================
+
+//===========================================================================
+#include "ext.h"			// standard Max include, always required (except in Jitter)
+#include "ext_obex.h"		// required for "new" style objects
+#include "z_dsp.h"			// required for MSP objects
+
+//===========================================================================
+// BTrack includes
+#include "../../src/BTrack.h"
+#include "../../src/OnsetDetectionFunction.h"
+
+//===========================================================================
+// struct to represent the object's state
+typedef struct _btrack {
+    
+    // The object itself (t_pxobject in MSP instead of t_object)
+	t_pxobject		ob;
+    
+    // An instance of the BTrack beat tracker
+    BTrack			*b;
+    
+    // Indicates whether the beat tracker should output beats
+    bool            should_output_beats;
+    
+    // the time of the last bang received in milliseconds
+    long            time_of_last_bang_ms;
+    
+    // a count in counter
+    long            count_in;
+    
+    // the recent tempi observed during count ins
+    double           count_in_tempi[3];
+    
+    // An outlet for beats
+    void            *beat_outlet;
+    
+    // An outlet for tempo estimates
+    void            *tempo_outlet;
+    
+} t_btrack;
+
+
+//===========================================================================
+// method prototypes
+void *btrack_new(t_symbol *s, long argc, t_atom *argv);
+void btrack_free(t_btrack *x);
+void btrack_assist(t_btrack *x, void *b, long m, long a, char *s);
+void btrack_float(t_btrack *x, double f);
+void btrack_dsp(t_btrack *x, t_signal **sp, short *count);
+void btrack_dsp64(t_btrack *x, t_object *dsp64, short *count, double samplerate, long maxvectorsize, long flags);
+t_int *btrack_perform(t_int *w);
+void btrack_perform64(t_btrack *x, t_object *dsp64, double **ins, long numins, double **outs, long numouts, long sampleframes, long flags, void *userparam);
+
+//===========================================================================
+void btrack_process(t_btrack *x,double* audioFrame);
+
+void btrack_on(t_btrack *x);
+void btrack_off(t_btrack *x);
+
+void btrack_fixtempo(t_btrack *x, double f);
+void btrack_unfixtempo(t_btrack *x);
+
+void btrack_bang(t_btrack *x);
+void btrack_countin(t_btrack *x);
+
+void outlet_beat(t_btrack *x, t_symbol *s, long argc, t_atom *argv);
+
+// global class pointer variable
+static t_class *btrack_class = NULL;
+
+
+
+
+//===========================================================================
+int C74_EXPORT main(void)
+{	
+    //--------------------------------------------------------------
+	t_class *c = class_new("btrack~", (method)btrack_new, (method)btrack_free, (long)sizeof(t_btrack), 0L, A_GIMME, 0);
+	
+    //--------------------------------------------------------------
+	class_addmethod(c, (method)btrack_float,		"float",	A_FLOAT, 0);
+	class_addmethod(c, (method)btrack_dsp,		"dsp",		A_CANT, 0);		// Old 32-bit MSP dsp chain compilation for Max 5 and earlier
+	class_addmethod(c, (method)btrack_dsp64,		"dsp64",	A_CANT, 0);		// New 64-bit MSP dsp chain compilation for Max 6
+	class_addmethod(c, (method)btrack_assist,	"assist",	A_CANT, 0);
+    
+    //--------------------------------------------------------------
+    class_addmethod(c, (method)btrack_on,	"on", 0);
+    class_addmethod(c, (method)btrack_off,	"off", 0);
+
+    //--------------------------------------------------------------
+    class_addmethod(c, (method)btrack_fixtempo,		"fixtempo",	A_FLOAT, 0);
+    class_addmethod(c, (method)btrack_unfixtempo,	"unfixtempo", 0);
+    
+    //--------------------------------------------------------------
+    class_addmethod(c, (method)btrack_bang,		"bang", 0);
+    class_addmethod(c, (method)btrack_countin,	"countin", 0);
+    
+    //--------------------------------------------------------------
+	class_dspinit(c);
+	class_register(CLASS_BOX, c);
+	btrack_class = c;
+
+	return 0;
+}
+
+//===========================================================================
+void *btrack_new(t_symbol *s, long argc, t_atom *argv)
+{
+	t_btrack *x = (t_btrack *)object_alloc(btrack_class);
+
+	if (x) {
+		dsp_setup((t_pxobject *)x, 1);	// MSP inlets: arg is # of inlets and is REQUIRED! 
+										// use 0 if you don't need inlets
+
+        // create detection function and beat tracking objects
+        x->b = new BTrack();
+        
+        // create outlets for bpm and beats
+        x->tempo_outlet = floatout(x);
+        x->beat_outlet = bangout(x);
+        
+        // initialise variables
+        x->should_output_beats = true;
+        x->time_of_last_bang_ms = 0;
+        x->count_in = 4;
+        x->count_in_tempi[0] = 120;
+        x->count_in_tempi[1] = 120;
+        x->count_in_tempi[2] = 120;
+
+	}
+	return (x);
+}
+
+
+//===========================================================================
+void btrack_free(t_btrack *x) 
+{
+    // delete the beat tracker
+    delete x->b;
+    x->b = NULL;
+    
+    // call the dsp free function on our object
+    dsp_free((t_pxobject *)x);
+}
+
+
+//===========================================================================
+void btrack_assist(t_btrack *x, void *b, long m, long a, char *s)
+{
+    if (m == ASSIST_INLET) { //inlet
+        if (a == 0)
+        {
+            sprintf(s, "(signal) Audio In");
+        }
+    }
+    else {	// outlet
+        if (a == 0)
+        {
+            sprintf(s, "Beats Out");
+        }
+        if (a == 1)
+        {
+            sprintf(s, "Tempo (bpm)");
+        }
+        
+    }
+}
+
+
+//===========================================================================
+void btrack_float(t_btrack *x, double f)
+{
+
+
+}
+
+//===========================================================================
+// this function is called when the DAC is enabled, and "registers" a function for the signal chain in Max 5 and earlier.
+// In this case we register the 32-bit, "btrack_perform" method.
+void btrack_dsp(t_btrack *x, t_signal **sp, short *count)
+{
+    // get hop size and frame size
+    int hopSize = (int) sp[0]->s_n;
+    int frameSize = hopSize*2;
+    
+    // initialise the beat tracker
+    x->b->updateHopAndFrameSize(hopSize, frameSize);
+    
+    // set up dsp
+	dsp_add(btrack_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
+}
+
+
+//===========================================================================
+// this is the Max 6 version of the dsp method -- it registers a function for the signal chain in Max 6,
+// which operates on 64-bit audio signals.
+void btrack_dsp64(t_btrack *x, t_object *dsp64, short *count, double samplerate, long maxvectorsize, long flags)
+{
+     // get hop size and frame size
+    int hopSize = (int) maxvectorsize;
+    int frameSize = hopSize*2;
+    
+    // initialise the beat tracker
+    x->b->updateHopAndFrameSize(hopSize, frameSize);
+		
+    // set up dsp
+	object_method(dsp64, gensym("dsp_add64"), x, btrack_perform64, 0, NULL);
+}
+
+
+//===========================================================================
+// this is the 32-bit perform method for Max 5 and earlier
+t_int *btrack_perform(t_int *w)
+{
+	t_btrack *x = (t_btrack *)(w[1]);
+	t_float *inL = (t_float *)(w[2]);
+	int n = (int)w[3];
+	
+    double audioFrame[n];
+    
+    for (int i = 0;i < n;i++)
+    {
+        audioFrame[i] = (double) inL[i];
+    }
+    
+    btrack_process(x,audioFrame);
+		
+	// you have to return the NEXT pointer in the array OR MAX WILL CRASH
+	return w + 4;
+}
+
+//===========================================================================
+// this is 64-bit perform method for Max 6
+void btrack_perform64(t_btrack *x, t_object *dsp64, double **ins, long numins, double **outs, long numouts, long sampleframes, long flags, void *userparam)
+{
+	t_double *inL = ins[0];		// we get audio for each inlet of the object from the **ins argument
+	int n = sampleframes;
+    
+    double audioFrame[n];
+    
+    for (int i = 0;i < n;i++)
+    {
+        audioFrame[i] = (double) inL[i];
+    }
+    
+    btrack_process(x,audioFrame);
+}
+
+//===========================================================================
+void btrack_process(t_btrack *x,double* audioFrame)
+{
+    // process the audio frame
+    x->b->processAudioFrame(audioFrame);
+    
+    
+    // if there is a beat in this frame
+    if (x->b->beatDueInCurrentFrame())
+    {
+        // outlet a beat
+        defer_low((t_object *)x, (method)outlet_beat, NULL, 0, NULL);
+    }
+}
+
+//===========================================================================
+void outlet_beat(t_btrack *x, t_symbol *s, long argc, t_atom *argv)
+{
+    if (x->should_output_beats)
+    {
+        // send a bang out of the beat outlet
+        outlet_bang(x->beat_outlet);
+    
+        // send the tempo out of the tempo outlet
+        outlet_float(x->tempo_outlet, (float) x->b->getCurrentTempoEstimate());
+    }
+}
+
+
+//===========================================================================
+void btrack_on(t_btrack *x)
+{
+    x->should_output_beats = true;
+}
+
+//===========================================================================
+void btrack_off(t_btrack *x)
+{
+    x->should_output_beats = false;
+    x->count_in = 4;
+}
+
+//===========================================================================
+void btrack_fixtempo(t_btrack *x, double f)
+{
+    x->b->fixTempo(f);
+    object_post((t_object *) x,"Tempo fixed to %f BPM",f);
+}
+
+//===========================================================================
+void btrack_unfixtempo(t_btrack *x)
+{
+    x->b->doNotFixTempo();
+    object_post((t_object *) x,"Tempo no longer fixed");
+}
+
+//===========================================================================
+void btrack_countin(t_btrack *x)
+{
+    x->count_in = x->count_in-1;
+    
+    btrack_bang(x);
+    if (x->count_in == 0)
+    {
+        x->should_output_beats = 1;
+    }
+}
+
+//===========================================================================
+void btrack_bang(t_btrack *x)
+{
+    double bperiod;
+    double tempo;
+    double mean_tempo;
+    
+    // get current time in milliseconds
+    long ms = systime_ms();
+    
+    // calculate beat period
+    bperiod = ((double) (ms - x->time_of_last_bang_ms))/1000.0;
+    
+    // store time since last bang
+    x->time_of_last_bang_ms = ms;
+    
+    // if beat period is between 0 and 1
+    if ((bperiod < 1.0) && (bperiod > 0.0))
+    {
+        // calculate tempo from beat period
+        tempo = (1/bperiod)*60;
+        
+        double sum = 0;
+        
+        // move back elements in tempo history and sum remaining elements
+        for (int i = 0;i < 2;i++)
+        {
+            x->count_in_tempi[i] = x->count_in_tempi[i+1];
+            sum = sum+x->count_in_tempi[i];
+        }
+        
+        // set final element to be the newly calculated tempo
+        x->count_in_tempi[2] = tempo;
+        
+        // add the new tempo to the sum
+        sum = sum+x->count_in_tempi[2];
+        
+        // calculate the mean tempo by dividing the tempo by 3
+        mean_tempo = sum/3;
+        
+        // set the tempo in the beat tracker
+        x->b->setTempo(mean_tempo);
+    }
+}
+
+
+