finished audio effects support in audio renderer

Working structure implemented in previous commit into the audio renderer is
complete in this commit.

app/render/backend/audio/audioworker.cpp

@@ -11,3 +11,35 @@ void AudioWorker::FrameToValue(StreamPtr stream, FramePtr frame, NodeValueTable
 
   table->Push(NodeParam::kSamples, frame->ToByteArray());
 }
+
+void AudioWorker::RunNodeAccelerated(const Node *node, const TimeRange &range, const NodeValueDatabase *input_params, NodeValueTable *output_params)
+{
+  // Check if node processes samples
+  if (!node->ProcessesSamplesFrom()) {
+    return;
+  }
+
+  // Try to find the sample buffer in the table
+  QVariant samples_var = (*input_params)[node->ProcessesSamplesFrom()].Get(NodeParam::kSamples);
+
+  // If there isn't one, there's nothing to do
+  if (samples_var.isNull()) {
+    return;
+  }
+
+  QByteArray input_buffer = samples_var.toByteArray();
+  QByteArray output_buffer(input_buffer.size(), 0);
+
+  int sample_count = input_buffer.size() / audio_params().bytes_per_sample_per_channel();
+
+  // FIXME: Hardcoded float sample format
+  for (int i=0;i<sample_count;i++) {
+    node->ProcessSamples(input_params,
+                         audio_params(),
+                         reinterpret_cast<const float*>(input_buffer.constData()),
+                         reinterpret_cast<float*>(output_buffer.data()),
+                         i);
+  }
+
+  output_params->Push(NodeParam::kSamples, output_buffer);
+}