Added backend support for audio buffers (PipeWire)

plugin/AudioImageProvider.cpp

@@ -0,0 +1,16 @@
+#include "AudioImageProvider.h"
+
+AudioImageProvider::AudioImageProvider() 
+    : QQuickImageProvider(QQuickImageProvider::Pixmap) {}
+
+QPixmap AudioImageProvider::requestPixmap(const QString &id, QSize *size, const QSize &requestedSize)
+{
+    Q_UNUSED(id) // id is useless here. we always want to return the latest frame from AudioModel
+    Q_UNUSED(requestedSize) // requested size is useless too. texture must always be 512x2
+
+    if(size)
+        *size = AudioModel::frame().size();
+
+    //return the latest frame
+    return AudioModel::frame();
+}