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+/*
+ * Copyright (C) 2003-2014 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.hxx"
+#include "output/Timer.hxx"
+#include "thread/Mutex.hxx"
+#include "event/ServerSocket.hxx"
+#include "event/DeferredMonitor.hxx"
+#include "util/Cast.hxx"
+#include "Compiler.h"
+
+#ifdef _LIBCPP_VERSION
+/* can't use incomplete template arguments with libc++ */
+#include "HttpdClient.hxx"
+#endif
+
+#include <forward_list>
+#include <queue>
+#include <list>
+
+struct config_param;
+class Error;
+class EventLoop;
+class ServerSocket;
+class HttpdClient;
+class Page;
+struct Encoder;
+struct Tag;
+
+class HttpdOutput final : ServerSocket, DeferredMonitor {
+ AudioOutput base;
+
+ /**
+ * True if the audio output is open and accepts client
+ * connections.
+ */
+ bool open;
+
+ /**
+ * The configured encoder plugin.
+ */
+ 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;
+
+public:
+ /**
+ * The MIME type produced by the #encoder.
+ */
+ const char *content_type;
+
+ /**
+ * This mutex protects the listener socket and the client
+ * list.
+ */
+ mutable Mutex mutex;
+
+ /**
+ * This condition gets signalled when an item is removed from
+ * #pages.
+ */
+ Cond cond;
+
+private:
+ /**
+ * A #Timer object to synchronize this output with the
+ * wallclock.
+ */
+ 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 page queue, i.e. pages from the encoder to be
+ * broadcasted to all clients. This container is necessary to
+ * pass pages from the OutputThread to the IOThread. It is
+ * protected by #mutex, and removing signals #cond.
+ */
+ std::queue<Page *, std::list<Page *>> pages;
+
+ public:
+ /**
+ * The configured name.
+ */
+ char const *name;
+ /**
+ * The configured genre.
+ */
+ char const *genre;
+ /**
+ * The configured website address.
+ */
+ char const *website;
+
+private:
+ /**
+ * 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.
+ */
+ unsigned clients_max, clients_cnt;
+
+public:
+ HttpdOutput(EventLoop &_loop);
+ ~HttpdOutput();
+
+#if defined(__clang__) || GCC_CHECK_VERSION(4,7)
+ constexpr
+#endif
+ static HttpdOutput *Cast(AudioOutput *ao) {
+ return &ContainerCast(*ao, &HttpdOutput::base);
+ }
+
+ using DeferredMonitor::GetEventLoop;
+
+ bool Init(const config_param &param, Error &error);
+
+ bool Configure(const config_param &param, Error &error);
+
+ AudioOutput *InitAndConfigure(const config_param &param,
+ Error &error) {
+ if (!Init(param, error))
+ return nullptr;
+
+ if (!Configure(param, error))
+ return nullptr;
+
+ return &base;
+ }
+
+ bool Bind(Error &error);
+ void Unbind();
+
+ /**
+ * Caller must lock the mutex.
+ */
+ bool OpenEncoder(AudioFormat &audio_format, Error &error);
+
+ /**
+ * Caller must lock the mutex.
+ */
+ bool Open(AudioFormat &audio_format, Error &error);
+
+ /**
+ * 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;
+
+ gcc_pure
+ unsigned Delay() 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, Error &error);
+
+ void SendTag(const Tag *tag);
+
+ size_t Play(const void *chunk, size_t size, Error &error);
+
+ void CancelAllClients();
+
+private:
+ virtual void RunDeferred() override;
+
+ virtual void OnAccept(int fd, const sockaddr &address,
+ size_t address_length, int uid) override;
+};
+
+extern const class Domain httpd_output_domain;
+
+#endif