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diff --git a/src/output/HttpdInternal.hxx b/src/output/HttpdInternal.hxx
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+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/** \file
+ *
+ * Internal declarations for the "httpd" audio output plugin.
+ */
+
+#ifndef MPD_OUTPUT_HTTPD_INTERNAL_H
+#define MPD_OUTPUT_HTTPD_INTERNAL_H
+
+#include "output_internal.h"
+#include "timer.h"
+#include "thread/Mutex.hxx"
+#include "event/ServerSocket.hxx"
+
+#include <forward_list>
+
+struct config_param;
+class EventLoop;
+class ServerSocket;
+class HttpdClient;
+class Page;
+
+struct HttpdOutput final : private ServerSocket {
+	struct audio_output base;
+
+	/**
+	 * True if the audio output is open and accepts client
+	 * connections.
+	 */
+	bool open;
+
+	/**
+	 * The configured encoder plugin.
+	 */
+	struct encoder *encoder;
+
+	/**
+	 * Number of bytes which were fed into the encoder, without
+	 * ever receiving new output.  This is used to estimate
+	 * whether MPD should manually flush the encoder, to avoid
+	 * buffer underruns in the client.
+	 */
+	size_t unflushed_input;
+
+	/**
+	 * The MIME type produced by the #encoder.
+	 */
+	const char *content_type;
+
+	/**
+	 * This mutex protects the listener socket and the client
+	 * list.
+	 */
+	mutable Mutex mutex;
+
+	/**
+	 * A #timer object to synchronize this output with the
+	 * wallclock.
+	 */
+	struct timer *timer;
+
+	/**
+	 * The header page, which is sent to every client on connect.
+	 */
+	Page *header;
+
+	/**
+	 * The metadata, which is sent to every client.
+	 */
+	Page *metadata;
+
+	/**
+	 * The configured name.
+	 */
+	char const *name;
+	/**
+	 * The configured genre.
+	 */
+	char const *genre;
+	/**
+	 * The configured website address.
+	 */
+	char const *website;
+
+	/**
+	 * A linked list containing all clients which are currently
+	 * connected.
+	 */
+	std::forward_list<HttpdClient> clients;
+
+	/**
+	 * A temporary buffer for the httpd_output_read_page()
+	 * function.
+	 */
+	char buffer[32768];
+
+	/**
+	 * The maximum and current number of clients connected
+	 * at the same time.
+	 */
+	guint clients_max, clients_cnt;
+
+	HttpdOutput(EventLoop &_loop);
+	~HttpdOutput();
+
+	bool Configure(const config_param *param, GError **error_r);
+
+	bool Bind(GError **error_r);
+	void Unbind();
+
+	/**
+	 * Caller must lock the mutex.
+	 */
+	bool OpenEncoder(struct audio_format *audio_format,
+			 GError **error_r);
+
+	/**
+	 * Caller must lock the mutex.
+	 */
+	bool Open(struct audio_format *audio_format, GError **error_r);
+
+	/**
+	 * Caller must lock the mutex.
+	 */
+	void Close();
+
+	/**
+	 * Check whether there is at least one client.
+	 *
+	 * Caller must lock the mutex.
+	 */
+	gcc_pure
+	bool HasClients() const {
+		return !clients.empty();
+	}
+
+	/**
+	 * Check whether there is at least one client.
+	 */
+	gcc_pure
+	bool LockHasClients() const {
+		const ScopeLock protect(mutex);
+		return HasClients();
+	}
+
+	void AddClient(int fd);
+
+	/**
+	 * Removes a client from the httpd_output.clients linked list.
+	 */
+	void RemoveClient(HttpdClient &client);
+
+	/**
+	 * Sends the encoder header to the client.  This is called
+	 * right after the response headers have been sent.
+	 */
+	void SendHeader(HttpdClient &client) const;
+
+	/**
+	 * Reads data from the encoder (as much as available) and
+	 * returns it as a new #page object.
+	 */
+	Page *ReadPage();
+
+	/**
+	 * Broadcasts a page struct to all clients.
+	 *
+	 * Mutext must not be locked.
+	 */
+	void BroadcastPage(Page *page);
+
+	/**
+	 * Broadcasts data from the encoder to all clients.
+	 */
+	void BroadcastFromEncoder();
+
+	bool EncodeAndPlay(const void *chunk, size_t size, GError **error_r);
+
+	void SendTag(const struct tag *tag);
+
+private:
+	virtual void OnAccept(int fd, const sockaddr &address,
+			      size_t address_length, int uid) override;
+};
+
+#endif