Merge pull request #439 from drowe67/ms-clear-audio-plots

Clear audio plots when recording or playback starts.

USER_MANUAL.html

@@ -606,6 +606,7 @@ <h2 data-number="17.1" id="v1.8.12-tbd-2023"><span class="header-section-number"
 <ol type="1">
 <li>Bugfixes:
 <ul>
+<li>Clear audio plots when recording or playback starts. (PR #439)</li>
 <li>Clear button now clears the callsign list. (PR #436)</li>
 </ul></li>
 <li>Build system:

USER_MANUAL.md

@@ -866,6 +866,7 @@ LDPC | Low Density Parity Check Codes - a family of powerful FEC codes
 ## V1.8.12 TBD 2023
 
 1. Bugfixes:
+    * Clear audio plots when recording or playback starts. (PR #439)
     * Clear button now clears the callsign list. (PR #436)
 2. Build system:
     * Bump Codec2 version to v1.1.1. (PR #437)

src/dlg_audiooptions.cpp

@@ -812,6 +812,12 @@ void AudioOptsDialog::plotDeviceInputForAFewSecs(wxString devName, PlotScalar *p
         FIFO               *fifo, *callbackFifo;
         int src_error;
 
+        // Reset plot before starting.
+        CallAfter([&]() {
+            ps->clearSamples();
+            ps->Refresh();
+        });
+
         fifo = codec2_fifo_create((int)(DT*TEST_WAVEFORM_PLOT_FS*2)); assert(fifo != NULL);
         src = src_new(SRC_SINC_FASTEST, 1, &src_error); assert(src != NULL);
 
@@ -940,6 +946,12 @@ void AudioOptsDialog::plotDeviceOutputForAFewSecs(wxString devName, PlotScalar *
         FIFO               *fifo, *callbackFifo;
         int src_error, n = 0;
 
+        // Reset plot before starting.
+        CallAfter([&]() {
+            ps->clearSamples();
+            ps->Refresh();
+        });
+
         fifo = codec2_fifo_create((int)(DT*TEST_WAVEFORM_PLOT_FS*2)); assert(fifo != NULL);
         src = src_new(SRC_SINC_FASTEST, 1, &src_error); assert(src != NULL);
 

src/plot_scalar.cpp

@@ -339,6 +339,11 @@ void PlotScalar::drawGraticule(wxGraphicsContext* ctx)
 
 }
 
+void PlotScalar::clearSamples()
+{
+    memset(m_mem, 0, sizeof(float) * m_samples);
+}
+
 //----------------------------------------------------------------
 // OnSize()
 //----------------------------------------------------------------

src/plot_scalar.h

@@ -50,6 +50,8 @@ class PlotScalar: public PlotPanel
          void setBarGraph(int bar_graph) { m_bar_graph = bar_graph; }
          void setLogY(int logy) { m_logy = logy; }
 
+         void clearSamples();
+
     protected:
 
          int      m_channels;