ytdl: WIP: virtual InputStream::GetURI()

See MusicPlayerDaemon#19 for details. Also note the lack of synchronization for now.

src/input/InputStream.hxx

@@ -153,7 +153,7 @@ public:
 	 *
 	 * No lock necessary for this method.
 	 */
-	const char *GetURI() const noexcept {
+	virtual const char *GetURI() const noexcept {
 		return uri.c_str();
 	}
 

src/input/ProxyInputStream.cxx

@@ -71,6 +71,16 @@ ProxyInputStream::CopyAttributes()
 	}
 }
 
+const char*
+ProxyInputStream::GetURI() const noexcept
+{
+	if (input) {
+		return input->GetURI();
+	} else {
+		return InputStream::GetURI();
+	}
+}
+
 void
 ProxyInputStream::Check()
 {

src/input/ProxyInputStream.hxx

@@ -58,6 +58,7 @@ public:
 	ProxyInputStream &operator=(const ProxyInputStream &) = delete;
 
 	/* virtual methods from InputStream */
+	const char *GetURI() const noexcept;
 	void Check() override;
 	void Update() noexcept override;
 	void Seek(std::unique_lock<Mutex> &lock,

src/input/plugins/YtdlInputStream.cxx

@@ -15,6 +15,14 @@ YtdlInputStream::YtdlInputStream(const char *_uri, Mutex &_mutex, EventLoop &eve
 YtdlInputStream::~YtdlInputStream() noexcept {
 }
 
+const char *YtdlInputStream::GetURI() const noexcept {
+	if (inner != nullptr) {
+		return inner->GetURI();
+	} else {
+		return InputStream::GetURI();
+	}
+}
+
 void YtdlInputStream::SyncFields() noexcept {
 	seekable = inner->IsSeekable();
 	offset = inner->GetOffset();

src/input/plugins/YtdlInputStream.hxx

@@ -22,6 +22,7 @@ public:
 	virtual void Check();
 	virtual void Update() noexcept;
 	virtual void Seek(std::unique_lock<Mutex> &lock, offset_type by_offset);
+	virtual const char *GetURI() const noexcept;
 
 	gcc_pure
 	virtual bool IsEOF() const noexcept;