implemented volume and pan effects

This commit implements a structure for sample processing and two implemenations of this structure in volume and pan effects.
2019-12-24 12:34:30 +11:00
parent 3a7b3ffac6
commit 7ad2eae7a2
13 changed files with 275 additions and 1 deletions
@@ -0,0 +1,67 @@
+#include "pan.h"
+
+PanNode::PanNode()
+{
+  samples_input_ = new NodeInput("samples_in");
+  samples_input_->set_data_type(NodeParam::kSamples);
+  AddInput(samples_input_);
+
+  panning_input_ = new NodeInput("panning_in");
+  panning_input_->set_data_type(NodeParam::kFloat);
+  panning_input_->set_minimum(-1);
+  panning_input_->set_maximum(1);
+  panning_input_->set_value_at_time(0, 0);
+  AddInput(panning_input_);
+}
+
+Node *PanNode::copy() const
+{
+  return new PanNode();
+}
+
+QString PanNode::Name() const
+{
+  return tr("Pan");
+}
+
+QString PanNode::id() const
+{
+  return "org.olivevideoeditor.Olive.pan";
+}
+
+QString PanNode::Category() const
+{
+  return tr("Audio");
+}
+
+QString PanNode::Description() const
+{
+  return tr("Adjust the stereo panning of an audio source.");
+}
+
+bool PanNode::ProcessesSamples() const
+{
+  return true;
+}
+
+void PanNode::ProcessSamples(const NodeValueDatabase &values, const AudioRenderingParams &params, const float *input, float *output, int index) const
+{
+  if (params.channel_count() != 2) {
+    // This node currently only works for stereo audio
+    return;
+  }
+
+  float pan_val = values[panning_input_].Get(NodeParam::kFloat).toFloat();
+
+  if (index%2 == 0) {
+    // Sample is left channel
+    if (pan_val > 0) {
+      output[index] = input[index] * (1.0F - pan_val);
+    }
+  } else {
+    // Sample is right channel
+    if (pan_val < 0) {
+      output[index] = input[index] * (1.0F - qAbs(pan_val));
+    }
+  }
+}