Volume slider works

src/pipewire/pipewirecontroller.cpp

@@ -5,6 +5,7 @@
 #include <QString>
 #include <QElapsedTimer>
 #include <QThread>
+#include <algorithm>
 #include <cstring>
 #include <cstdlib>
 #include <cmath>
@@ -13,6 +14,7 @@
 #include <pipewire/keys.h>
 #include <pipewire/properties.h>
 #include <pipewire/stream.h>
+#include <pipewire/node.h>
 #include <spa/param/props.h>
 #include <spa/param/audio/format-utils.h>
 #include <spa/param/audio/raw.h>
@@ -444,6 +446,40 @@ float PipeWireController::meterPeak() const
     return peak;
 }
 
+bool PipeWireController::setNodeVolume(uint32_t nodeId, float volume, bool mute)
+{
+    if (!m_threadLoop || !m_core || !m_registry) {
+        return false;
+    }
+
+    if (nodeId == 0) {
+        return false;
+    }
+
+    volume = std::clamp(volume, 0.0f, 1.0f);
+
+    lock();
+    auto *node = static_cast<struct pw_node*>(
+        pw_registry_bind(m_registry, nodeId, PW_TYPE_INTERFACE_Node, PW_VERSION_NODE, 0));
+    if (!node) {
+        unlock();
+        return false;
+    }
+
+    uint8_t buffer[128];
+    spa_pod_builder builder = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
+    auto *param = reinterpret_cast<const struct spa_pod*>(spa_pod_builder_add_object(
+        &builder,
+        SPA_TYPE_OBJECT_Props, SPA_PARAM_Props,
+        SPA_PROP_volume, SPA_POD_Float(volume),
+        SPA_PROP_mute, SPA_POD_Bool(mute)));
+
+    pw_node_set_param(node, SPA_PARAM_Props, 0, param);
+    pw_proxy_destroy(reinterpret_cast<struct pw_proxy*>(node));
+    unlock();
+    return true;
+}
+
 float PipeWireController::nodeMeterPeak(uint32_t nodeId) const
 {
     QMutexLocker lock(&m_meterMutex);