InputStream: add virtual destructor

Replaces the method Close().

src/input/plugins/AlsaInputPlugin.cxx

@@ -373,13 +373,6 @@ alsa_input_open(const char *uri, Mutex &mutex, Cond &cond, Error &error)
 	return AlsaInputStream::Create(uri, mutex, cond, error);
 }
 
-static void
-alsa_input_close(InputStream *is)
-{
-	AlsaInputStream *ais = (AlsaInputStream *)is;
-	delete ais;
-}
-
 static bool
 alsa_input_available(InputStream *is)
 {
@@ -406,7 +399,6 @@ const struct InputPlugin input_plugin_alsa = {
 	nullptr,
 	nullptr,
 	alsa_input_open,
-	alsa_input_close,
 	nullptr,
 	nullptr,
 	nullptr,

src/input/plugins/ArchiveInputPlugin.cxx

@@ -96,5 +96,4 @@ const InputPlugin input_plugin_archive = {
 	nullptr,
 	nullptr,
 	nullptr,
-	nullptr,
 };

src/input/plugins/CdioParanoiaInputPlugin.cxx

@@ -105,14 +105,6 @@ input_cdio_init(const config_param &param, Error &error)
 	return InputPlugin::InitResult::SUCCESS;
 }
 
-static void
-input_cdio_close(InputStream *is)
-{
-	CdioParanoiaInputStream *i = (CdioParanoiaInputStream *)is;
-
-	delete i;
-}
-
 struct cdio_uri {
 	char device[64];
 	int track;
@@ -394,7 +386,6 @@ const InputPlugin input_plugin_cdio_paranoia = {
 	input_cdio_init,
 	nullptr,
 	input_cdio_open,
-	input_cdio_close,
 	nullptr,
 	nullptr,
 	nullptr,

src/input/plugins/CurlInputPlugin.cxx

@@ -805,14 +805,6 @@ input_curl_read(InputStream *is, void *ptr, size_t size,
 	return c.Read(ptr, size, error);
 }
 
-static void
-input_curl_close(InputStream *is)
-{
-	CurlInputStream *c = (CurlInputStream *)is;
-
-	delete c;
-}
-
 static bool
 input_curl_eof(gcc_unused InputStream *is)
 {
@@ -1144,7 +1136,6 @@ const struct InputPlugin input_plugin_curl = {
 	input_curl_init,
 	input_curl_finish,
 	input_curl_open,
-	input_curl_close,
 	input_curl_check,
 	nullptr,
 	input_curl_tag,

src/input/plugins/DespotifyInputPlugin.cxx

@@ -61,9 +61,7 @@ class DespotifyInputStream final : public InputStream {
 	}
 
 public:
-	~DespotifyInputStream() {
-		despotify_free_track(track);
-	}
+	~DespotifyInputStream();
 
 	static InputStream *Open(const char *url, Mutex &mutex, Cond &cond,
 				 Error &error);
@@ -146,6 +144,12 @@ static void callback(gcc_unused struct despotify_session* ds,
 	ctx->Callback(sig);
 }
 
+DespotifyInputStream::~DespotifyInputStream()
+{
+	mpd_despotify_unregister_callback(callback);
+	despotify_free_track(track);
+}
+
 inline InputStream *
 DespotifyInputStream::Open(const char *url,
 			   Mutex &mutex, Cond &cond,
@@ -220,15 +224,6 @@ input_despotify_read(InputStream *is, void *ptr, size_t size, Error &error)
 	return ctx->Read(ptr, size, error);
 }
 
-static void
-input_despotify_close(InputStream *is)
-{
-	DespotifyInputStream *ctx = (DespotifyInputStream *)is;
-
-	mpd_despotify_unregister_callback(callback);
-	delete ctx;
-}
-
 static bool
 input_despotify_eof(InputStream *is)
 {
@@ -250,7 +245,6 @@ const InputPlugin input_plugin_despotify = {
 	nullptr,
 	nullptr,
 	input_despotify_open,
-	input_despotify_close,
 	nullptr,
 	nullptr,
 	input_despotify_tag,

src/input/plugins/FfmpegInputPlugin.cxx

@@ -125,14 +125,6 @@ input_ffmpeg_read(InputStream *is, void *ptr, size_t size,
 	return (size_t)ret;
 }
 
-static void
-input_ffmpeg_close(InputStream *is)
-{
-	FfmpegInputStream *i = (FfmpegInputStream *)is;
-
-	delete i;
-}
-
 static bool
 input_ffmpeg_eof(InputStream *is)
 {
@@ -163,7 +155,6 @@ const InputPlugin input_plugin_ffmpeg = {
 	input_ffmpeg_init,
 	nullptr,
 	input_ffmpeg_open,
-	input_ffmpeg_close,
 	nullptr,
 	nullptr,
 	nullptr,

src/input/plugins/FileInputPlugin.cxx

@@ -123,14 +123,6 @@ input_file_read(InputStream *is, void *ptr, size_t size,
 	return (size_t)nbytes;
 }
 
-static void
-input_file_close(InputStream *is)
-{
-	FileInputStream *fis = (FileInputStream *)is;
-
-	delete fis;
-}
-
 static bool
 input_file_eof(InputStream *is)
 {
@@ -142,7 +134,6 @@ const InputPlugin input_plugin_file = {
 	nullptr,
 	nullptr,
 	input_file_open,
-	input_file_close,
 	nullptr,
 	nullptr,
 	nullptr,

src/input/plugins/MmsInputPlugin.cxx

@@ -106,7 +106,6 @@ const InputPlugin input_plugin_mms = {
 	nullptr,
 	nullptr,
 	input_mms_open,
-	ThreadInputStream::Close,
 	ThreadInputStream::Check,
 	nullptr,
 	nullptr,

src/input/plugins/NfsInputPlugin.cxx

@@ -156,13 +156,6 @@ input_nfs_read(InputStream *is, void *ptr, size_t size,
 	return s.Read(ptr, size, error);
 }
 
-static void
-input_nfs_close(InputStream *is)
-{
-	NfsInputStream *s = (NfsInputStream *)is;
-	delete s;
-}
-
 static bool
 input_nfs_eof(InputStream *is)
 {
@@ -184,7 +177,6 @@ const InputPlugin input_plugin_nfs = {
 	nullptr,
 	nullptr,
 	input_nfs_open,
-	input_nfs_close,
 	nullptr,
 	nullptr,
 	nullptr,

src/input/plugins/RewindInputPlugin.cxx

@@ -60,7 +60,7 @@ public:
 	}
 
 	~RewindInputStream() {
-		input->Close();
+		delete input;
 	}
 
 	bool Check(Error &error) {
@@ -121,14 +121,6 @@ private:
 	}
 };
 
-static void
-input_rewind_close(InputStream *is)
-{
-	RewindInputStream *r = (RewindInputStream *)is;
-
-	delete r;
-}
-
 static bool
 input_rewind_check(InputStream *is, Error &error)
 {
@@ -263,7 +255,6 @@ const InputPlugin rewind_input_plugin = {
 	nullptr,
 	nullptr,
 	nullptr,
-	input_rewind_close,
 	input_rewind_check,
 	input_rewind_update,
 	input_rewind_tag,

src/input/plugins/SmbclientInputPlugin.cxx

@@ -149,13 +149,6 @@ input_smbclient_read(InputStream *is, void *ptr, size_t size,
 	return s.Read(ptr, size, error);
 }
 
-static void
-input_smbclient_close(InputStream *is)
-{
-	SmbclientInputStream *s = (SmbclientInputStream *)is;
-	delete s;
-}
-
 static bool
 input_smbclient_eof(InputStream *is)
 {
@@ -177,7 +170,6 @@ const InputPlugin input_plugin_smbclient = {
 	input_smbclient_init,
 	nullptr,
 	input_smbclient_open,
-	input_smbclient_close,
 	nullptr,
 	nullptr,
 	nullptr,