gr-fosphor: Add 'SPACE' as a 'freeze' control to pause the processing

In background samples are just discarded.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

include/gnuradio/fosphor/base_sink_c.h

@@ -53,6 +53,7 @@ namespace gr {
 	ZOOM_CENTER_DOWN,
 	RATIO_UP,
 	RATIO_DOWN,
+	FREEZE_TOGGLE,
       };
 
       virtual void execute_ui_action(enum ui_action_t action) = 0;

lib/QGLSurface.cc

@@ -95,6 +95,9 @@ QGLSurface::keyPressEvent(QKeyEvent *ke)
 	case Qt::Key_E:
 		this->d_block->execute_ui_action(qt_sink_c_impl::RATIO_DOWN);
 		break;
+	case Qt::Key_Space:
+		this->d_block->execute_ui_action(qt_sink_c_impl::FREEZE_TOGGLE);
+		break;
 	}
 }
 

lib/base_sink_c_impl.cc

@@ -55,7 +55,7 @@ const int base_sink_c_impl::k_db_per_div[] = {1, 2, 5, 10, 20};
 base_sink_c_impl::base_sink_c_impl()
   : d_db_ref(0), d_db_per_div_idx(3),
     d_zoom_enabled(false), d_zoom_center(0.5), d_zoom_width(0.2),
-    d_ratio(0.35f), d_active(false),
+    d_ratio(0.35f), d_frozen(false), d_active(false),
     d_frequency(), d_fft_window(gr::fft::window::WIN_BLACKMAN_hARRIS)
 {
 	/* Init FIFO */
@@ -151,9 +151,11 @@ base_sink_c_impl::render(void)
 		if (!len)
 			break;
 
-		/* Send to process */
-		data = this->d_fifo->read_peek(len, false);
-		fosphor_process(this->d_fosphor, data, len);
+		/* Send to process (if not frozen) */
+		if (!this->d_frozen) {
+			data = this->d_fifo->read_peek(len, false);
+			fosphor_process(this->d_fosphor, data, len);
+		}
 
 		/* Discard */
 		this->d_fifo->read_discard(len);
@@ -326,6 +328,10 @@ base_sink_c_impl::execute_ui_action(enum ui_action_t action)
 		if (this->d_ratio > 0.2f)
 			this->d_ratio -= 0.05f;
 		break;
+
+	case FREEZE_TOGGLE:
+		this->d_frozen ^= 1;
+		break;
 	}
 
 	this->settings_mark_changed(

lib/base_sink_c_impl.h

@@ -46,6 +46,7 @@ namespace gr {
       /* Worker thread */
       gr::thread::thread d_worker;
       bool d_active;
+      bool d_frozen;
 
       void worker();
       static void _worker(base_sink_c_impl *obj);

lib/glfw_sink_c_impl.cc

@@ -108,6 +108,10 @@ glfw_sink_c_impl::glfw_cb_key(int key, int scancode, int action, int mods)
 	case GLFW_KEY_E:
 		this->execute_ui_action(RATIO_DOWN);
 		break;
+
+	case GLFW_KEY_SPACE:
+		this->execute_ui_action(FREEZE_TOGGLE);
+		break;
 	}
 }
 

python/wx_sink_c.py

@@ -76,6 +76,7 @@ class wx_sink_c(gr.hier_block2):
             ord('A'):       base_sink_c.ZOOM_CENTER_DOWN,
             ord('Q'):       base_sink_c.RATIO_UP,
             ord('E'):       base_sink_c.RATIO_DOWN,
+            wx.WXK_SPACE:   base_sink_c.FREEZE_TOGGLE,
         }
 
         k = evt.GetKeyCode()