Work on peak reader (WIP). Resize regions on zoom.

Peaks.C

@@ -64,50 +64,94 @@ Peaks::read ( int X, float *hi, float *lo ) const
     downsample( start, end, hi, lo );
 }
 
-void
-Peaks::read_peaks ( int s, int e, float *mhi, float *mlo ) const
+
+static
+int
+sf_read_peaks ( SNDFILE *in, Peak *peaks, int npeaks, int chunksize )
 {
-    /* this could be faster, but who cares. Don't zoom in so far! */
-
-    SNDFILE *in;
-    SF_INFO si;
-
-    memset( &si, 0, sizeof( si ) );
-
-    in = sf_open( _clip->name(), SFM_READ, &si );
-
-/*     if ( si.channels != 1 ) */
-/*         abort(); */
-/*     if ( si.samplerate != timeline.sample_rate ) */
-/*         abort(); */
-
-    sf_seek( in, s, SEEK_SET );
-
-    int chunksize = e - s;
-
     float *fbuf = new float[ chunksize ];
 
     size_t len;
 
-    /* read in a buffer */
-    len = sf_read_float( in, fbuf, chunksize );
-
-    Peak p;
-    p.max = -1.0;
-    p.min = 1.0;
-
-    for ( int i = 0; i < len; ++i )
+    int i;
+    for ( i = 0; i < npeaks; ++i )
     {
-        if ( fbuf[i] > p.max )
-            p.max = fbuf[i];
-        if ( fbuf[i] < p.min )
-            p.min = fbuf[i];
+        /* read in a buffer */
+        len = sf_read_float( in, fbuf, chunksize );
+
+        float hi = -1.0;
+        float lo = 1.0;
+
+        for ( int j = len; j--; )
+        {
+            if ( fbuf[j] > hi )
+                hi = fbuf[j];
+            if ( fbuf[j] < lo )
+                lo = fbuf[j];
+        }
+
+        peaks[ i ].max = hi;
+        peaks[ i ].min = lo;
+
+        if ( len < chunksize )
+            break;
     }
 
-    sf_close( in );
-
     delete fbuf;
 
+    return i;
+}
+
+void
+Peaks::read_peaks ( int s, int e, float *mhi, float *mlo ) const
+{
+    static Peak * peaks_read = NULL;
+    static nframes_t peaks_read_offset = 0;
+    const int buffer_size = BUFSIZ;
+
+    if ( ! peaks_read )
+        peaks_read = new Peak[ buffer_size ];
+    else
+    {
+        if ( s >= peaks_read_offset &&
+             e - peaks_read_offset < buffer_size )
+            goto done;
+
+        if ( e > peaks_read_offset + buffer_size )
+        {
+            printf( "hit buffer boundardy!\n" );
+            memmove( peaks_read, &peaks_read[ (s - peaks_read_offset) ], (buffer_size - (s - peaks_read_offset)) * sizeof( Peak ) );
+            peaks_read_offset = s;
+            goto done;
+        }
+    }
+
+    /* this could be faster, but who cares. Don't zoom in so far! */
+
+    {
+        SNDFILE *in;
+        SF_INFO si;
+
+        memset( &si, 0, sizeof( si ) );
+
+        in = sf_open( _clip->name(), SFM_READ, &si );
+
+        sf_seek( in, s, SEEK_SET );
+        peaks_read_offset = s;
+
+        int chunksize = e - s;
+
+        printf( "read %d peaks\n",  sf_read_peaks( in, peaks_read, buffer_size, chunksize ) );
+
+        sf_close( in );
+    }
+
+done:
+
+    // FIXME: should downsample here?
+
+    Peak p = peaks_read[ s - peaks_read_offset ];
+
     *mhi = p.max;
     *mlo = p.min;
 }

Region.C

@@ -44,6 +44,7 @@ Region::init ( void )
     box( FL_PLASTIC_UP_BOX );
 
     _track = NULL;
+    _offset = 0;
 }
 
 Region::Region ( const Region & rhs ) : Waveform( rhs )
@@ -55,6 +56,7 @@ Region::Region ( const Region & rhs ) : Waveform( rhs )
     labelcolor( rhs.labelcolor() );
     labeltype( rhs.labeltype() );
 
+    _offset = rhs._offset;
     _track = rhs._track;
 }
 
@@ -82,7 +84,7 @@ Region::trim ( enum trim_e t, int X )
                 _start = timeline.x_to_ts( x() + d );
 //                _start += timeline.x_to_ts( d );
 
-            resize( x() + d, y(), w() - d, h() );
+            Fl_Widget::resize( x() + d, y(), w() - d, h() );
             break;
         }
         case RIGHT:
@@ -90,7 +92,7 @@ Region::trim ( enum trim_e t, int X )
             int d = (x() + w()) - X;
 //            _end = _start + w() - d;
             _end = timeline.x_to_ts( _start + w() - d );
-            resize( x(), y(), w() - d, h() );
+            Fl_Widget::resize( x(), y(), w() - d, h() );
             break;
         }
         default:
@@ -225,14 +227,26 @@ Region::handle ( int m )
 }
 
 
+/** must be called whenever zoom is adjusted */
+void
+Region::resize ( void )
+{
+    int X = timeline.ts_to_x( _offset );
+    int W = timeline.ts_to_x( _end - _start );
+
+    if ( W )
+        Fl_Widget::resize( X, y(), W, h() );
+}
 
 void
 Region::draw ( void )
 {
+
     draw_box();
 
 //    fl_push_clip( x() + Fl::box_dx( box() ), y(), w() - Fl::box_dw( box() ), h() );
 
+
     Waveform::draw();
 
 //    fl_pop_clip();

Region.H

@@ -45,6 +45,8 @@ public:
 
     int handle ( int m );
     void draw ( void );
+    void resize ( void );
+
 
     Track * track ( void ) { return _track; }
     void track ( Track *t ) {  _track = t; }

Timeline.H

@@ -20,11 +20,13 @@
 #pragma once
 
 #include <FL/Fl_Scroll.H>
+#include <FL/Fl_Pack.H>
 
 #include "Clip.H"
 
 struct Timeline {
     Fl_Scroll *scroll;
+    Fl_Pack *tracks;
 
     float fpp;                                                  /* frames per pixel */
 

main.C

@@ -53,7 +53,18 @@ void
 cb_zoom ( Fl_Widget *w, void *v )
 {
     timeline.fpp = ((Fl_Slider*)w)->value();
+
+
+    for ( int i = timeline.tracks->children(); i-- ; )
+    {
+        Fl_Group *track = (Fl_Group*)timeline.tracks->child( i );
+        for ( int j = track->children(); j-- ; )
+            ((Region*)(track->child( j )))->resize();
+    }
+
     timeline.scroll->redraw();
+
+    printf( "%f\n", timeline.fpp );
 }
 
 int
@@ -70,8 +81,8 @@ main ( int argc, char **argv )
 
     timeline.sample_rate = 44100;
 
-    Fl_Pack *tracks = new Fl_Pack( 0, 0, 5000, 5000 );
-    tracks->type( Fl_Pack::VERTICAL );
+    timeline.tracks = new Fl_Pack( 0, 0, 5000, 5000 );
+    timeline.tracks->type( Fl_Pack::VERTICAL );
 
     Fl::get_system_colors();
     Fl::scheme( "plastic" );
@@ -87,7 +98,7 @@ main ( int argc, char **argv )
 
     Region *wave = new Region( new Clip( "streambass8.wav" ) );
 
-    wave->resize( 0, 0, 500, 100 );
+//    wave->resize( 0, 0, 500, 100 );
 
     //   wave->peaks( peaks );
     wave->start( 0 );
@@ -119,13 +130,14 @@ main ( int argc, char **argv )
     track1->next( track2 );
     track2->prev( track1 );
 
-    tracks->end();
+    timeline.tracks->end();
     timeline.scroll->end();
 
     Fl_Slider *zoom_slider = new Fl_Slider( 0, 0, 800, 24 );
     zoom_slider->type( 1 );
     zoom_slider->callback( cb_zoom, 0 );
-    zoom_slider->range( 1, 256 * 256 );
+    zoom_slider->range( 1, 1024 );
+    zoom_slider->step( 1 );
     zoom_slider->value( 256 );
 
     main_window->end();