service/pipewire: add pipewire module

src/services/pipewire/metadata.hpp

@@ -0,0 +1,64 @@
+#pragma once
+
+#include <pipewire/extensions/metadata.h>
+#include <pipewire/type.h>
+#include <qobject.h>
+#include <qtmetamacros.h>
+
+#include "core.hpp"
+#include "registry.hpp"
+
+namespace qs::service::pipewire {
+
+constexpr const char TYPE_INTERFACE_Metadata[] = PW_TYPE_INTERFACE_Metadata; // NOLINT
+class PwMetadata
+    : public PwBindable<pw_metadata, TYPE_INTERFACE_Metadata, PW_VERSION_METADATA> { // NOLINT
+	Q_OBJECT;
+
+public:
+	void bindHooks() override;
+	void unbindHooks() override;
+
+private:
+	static const pw_metadata_events EVENTS;
+	static int
+	onProperty(void* data, quint32 subject, const char* key, const char* type, const char* value);
+
+	SpaHook listener;
+};
+
+class PwDefaultsMetadata: public QObject {
+	Q_OBJECT;
+
+public:
+	explicit PwDefaultsMetadata(PwRegistry* registry);
+
+	[[nodiscard]] QString defaultSource() const;
+	[[nodiscard]] QString defaultSink() const;
+
+signals:
+	void defaultSourceChanged();
+	void defaultSinkChanged();
+
+private slots:
+	void onMetadataUpdate(
+	    PwMetadata* metadata,
+	    quint32 subject,
+	    const char* key,
+	    const char* type,
+	    const char* value
+	);
+
+private:
+	static QString parseNameSpaJson(const char* spaJson);
+
+	PwBindableRef<PwMetadata> defaultSinkHolder;
+	PwBindableRef<PwMetadata> defaultSourceHolder;
+
+	bool sinkConfigured = false;
+	QString mDefaultSink;
+	bool sourceConfigured = false;
+	QString mDefaultSource;
+};
+
+} // namespace qs::service::pipewire