Partition: new class, container for Playlist and PlayerControl

This is the beginning of multi-player support.  There will be support
for multiple Partition objects in one MPD process.

10 files changed, 102 insertions, 60 deletions

diff --git a/src/Listen.cxx b/src/Listen.cxx
index 8741da9c2..3ea9bae9a 100644
--- a/src/Listen.cxx
+++ b/src/Listen.cxx
@@ -20,7 +20,7 @@
 #include "config.h"
 #include "Listen.hxx"
 #include "Main.hxx"
-#include "Playlist.hxx"
+#include "Partition.hxx"
 #include "Client.hxx"
 
 extern "C" {
@@ -47,7 +47,7 @@ static void
 listen_callback(int fd, const struct sockaddr *address,
 		size_t address_length, int uid, G_GNUC_UNUSED void *ctx)
 {
-	client_new(g_playlist, global_player_control,
+	client_new(global_partition->playlist, &global_partition->pc,
 		   fd, address, address_length, uid);
 }
 
diff --git a/src/Main.cxx b/src/Main.cxx
index a8f6d55ee..371602247 100644
--- a/src/Main.cxx
+++ b/src/Main.cxx
@@ -20,9 +20,7 @@
 #include "config.h"
 #include "Main.hxx"
 #include "CommandLine.hxx"
-#include "Playlist.hxx"
 #include "PlaylistFile.hxx"
-#include "PlayerControl.hxx"
 #include "UpdateGlue.hxx"
 #include "MusicChunk.hxx"
 #include "StateFile.hxx"
@@ -35,6 +33,7 @@
 #include "ClientIdle.hxx"
 #include "Client.hxx"
 #include "AllCommands.hxx"
+#include "Partition.hxx"
 
 extern "C" {
 #include "daemon.h"
@@ -100,7 +99,7 @@ GMainLoop *main_loop;
 
 GCond *main_cond;
 
-struct player_control *global_player_control;
+Partition *global_partition;
 
 static bool
 glue_daemonize_init(const struct options *options, GError **error_r)
@@ -231,7 +230,7 @@ glue_state_file_init(GError **error_r)
 		return false;
 	}
 
-	state_file_init(path, global_player_control);
+	state_file_init(path, *global_partition);
 	g_free(path);
 
 	return true;
@@ -306,8 +305,13 @@ initialize_decoder_and_player(void)
 	if (buffered_before_play > buffered_chunks)
 		buffered_before_play = buffered_chunks;
 
-	global_player_control = new player_control(buffered_chunks,
-						   buffered_before_play);
+	const unsigned max_length =
+		config_get_positive(CONF_MAX_PLAYLIST_LENGTH,
+				    DEFAULT_PLAYLIST_MAX_LENGTH);
+
+	global_partition = new Partition(max_length,
+					 buffered_chunks,
+					 buffered_before_play);
 }
 
 /**
@@ -414,8 +418,7 @@ int mpd_main(int argc, char *argv[])
 	}
 
 	initPermissions();
-	playlist_global_init(config_get_positive(CONF_MAX_PLAYLIST_LENGTH,
-						 DEFAULT_PLAYLIST_MAX_LENGTH));
+	playlist_global_init();
 	spl_global_init();
 #ifdef ENABLE_ARCHIVE
 	archive_plugin_init_all();
@@ -438,7 +441,7 @@ int mpd_main(int argc, char *argv[])
 	initialize_decoder_and_player();
 	volume_init();
 	initAudioConfig();
-	audio_output_all_init(global_player_control);
+	audio_output_all_init(&global_partition->pc);
 	client_manager_init();
 	replay_gain_global_init();
 
@@ -464,7 +467,7 @@ int mpd_main(int argc, char *argv[])
 
 	initZeroconf();
 
-	player_create(global_player_control);
+	player_create(&global_partition->pc);
 
 	if (create_db) {
 		/* the database failed to load: recreate the
@@ -480,7 +483,7 @@ int mpd_main(int argc, char *argv[])
 		return EXIT_FAILURE;
 	}
 
-	audio_output_all_set_replay_gain_mode(replay_gain_get_real_mode(g_playlist.queue.random));
+	audio_output_all_set_replay_gain_mode(replay_gain_get_real_mode(global_partition->playlist.queue.random));
 
 	success = config_get_bool(CONF_AUTO_UPDATE, false);
 #ifdef ENABLE_INOTIFY
@@ -496,7 +499,7 @@ int mpd_main(int argc, char *argv[])
 
 	/* enable all audio outputs (if not already done by
 	   playlist_state_restore() */
-	pc_update_audio(global_player_control);
+	pc_update_audio(&global_partition->pc);
 
 #ifdef WIN32
 	win32_app_started();
@@ -517,12 +520,11 @@ int mpd_main(int argc, char *argv[])
 	mpd_inotify_finish();
 #endif
 
-	state_file_finish(global_player_control);
-	pc_kill(global_player_control);
+	state_file_finish(*global_partition);
+	pc_kill(&global_partition->pc);
 	finishZeroconf();
 	client_manager_deinit();
 	listen_global_finish();
-	playlist_global_finish();
 
 	start = clock();
 	DatabaseGlobalDeinit();
@@ -542,7 +544,7 @@ int mpd_main(int argc, char *argv[])
 	volume_finish();
 	mapper_finish();
 	path_global_finish();
-	delete global_player_control;
+	delete global_partition;
 	command_finish();
 	update_global_finish();
 	decoder_plugin_deinit_all();
diff --git a/src/Main.hxx b/src/Main.hxx
index 54916ff4b..6d61843a8 100644
--- a/src/Main.hxx
+++ b/src/Main.hxx
@@ -28,7 +28,7 @@ extern GMainLoop *main_loop;
 
 extern GCond *main_cond;
 
-extern struct player_control *global_player_control;
+extern struct Partition *global_partition;
 
 /**
  * A entry point for application.
diff --git a/src/Partition.hxx b/src/Partition.hxx
new file mode 100644
index 000000000..b91a4b6f9
--- /dev/null
+++ b/src/Partition.hxx
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2003-2013 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.
+ */
+
+#ifndef MPD_PARTITION_HXX
+#define MPD_PARTITION_HXX
+
+#include "Playlist.hxx"
+#include "PlayerControl.hxx"
+
+/**
+ * A partition of the Music Player Daemon.  It is a separate unit with
+ * a playlist, a player, outputs etc.
+ */
+struct Partition {
+	struct playlist playlist;
+
+	player_control pc;
+
+	Partition(unsigned max_length,
+		  unsigned buffer_chunks,
+		  unsigned buffered_before_play)
+		:pc(buffer_chunks, buffered_before_play) {
+		playlist_init(&playlist, max_length);
+	}
+
+	~Partition() {
+		playlist_finish(&playlist);
+	}
+};
+
+#endif
diff --git a/src/Playlist.hxx b/src/Playlist.hxx
index 3256f6422..163d17afe 100644
--- a/src/Playlist.hxx
+++ b/src/Playlist.hxx
@@ -70,14 +70,8 @@ struct playlist {
 	int queued;
 };
 
-/** the global playlist object */
-extern struct playlist g_playlist;
-
-void
-playlist_global_init(unsigned max_length);
-
 void
-playlist_global_finish(void);
+playlist_global_init();
 
 void
 playlist_init(struct playlist *playlist, unsigned max_length);
diff --git a/src/PlaylistGlobal.cxx b/src/PlaylistGlobal.cxx
index d9685a2be..92572cde9 100644
--- a/src/PlaylistGlobal.cxx
+++ b/src/PlaylistGlobal.cxx
@@ -25,36 +25,28 @@
 #include "config.h"
 #include "Playlist.hxx"
 #include "Main.hxx"
+#include "Partition.hxx"
 
 extern "C" {
 #include "event_pipe.h"
 }
 
-struct playlist g_playlist;
-
 static void
 playlist_tag_event(void)
 {
-	playlist_tag_changed(&g_playlist);
+	playlist_tag_changed(&global_partition->playlist);
 }
 
 static void
 playlist_event(void)
 {
-	playlist_sync(&g_playlist, global_player_control);
+	playlist_sync(&global_partition->playlist,
+		      &global_partition->pc);
 }
 
 void
-playlist_global_init(unsigned max_length)
+playlist_global_init()
 {
-	playlist_init(&g_playlist, max_length);
-
 	event_pipe_register(PIPE_EVENT_TAG, playlist_tag_event);
 	event_pipe_register(PIPE_EVENT_PLAYLIST, playlist_event);
 }
-
-void
-playlist_global_finish(void)
-{
-	playlist_finish(&g_playlist);
-}
diff --git a/src/StateFile.cxx b/src/StateFile.cxx
index db6635025..1d77b77de 100644
--- a/src/StateFile.cxx
+++ b/src/StateFile.cxx
@@ -20,9 +20,9 @@
 #include "config.h"
 #include "StateFile.hxx"
 #include "OutputState.hxx"
-#include "Playlist.hxx"
 #include "PlaylistState.hxx"
 #include "TextFile.hxx"
+#include "Partition.hxx"
 
 extern "C" {
 #include "volume.h"
@@ -49,7 +49,7 @@ static unsigned prev_volume_version, prev_output_version,
 	prev_playlist_version;
 
 static void
-state_file_write(struct player_control *pc)
+state_file_write(Partition &partition)
 {
 	FILE *fp;
 
@@ -66,17 +66,18 @@ state_file_write(struct player_control *pc)
 
 	save_sw_volume_state(fp);
 	audio_output_state_save(fp);
-	playlist_state_save(fp, &g_playlist, pc);
+	playlist_state_save(fp, &partition.playlist, &partition.pc);
 
 	fclose(fp);
 
 	prev_volume_version = sw_volume_state_get_hash();
 	prev_output_version = audio_output_state_get_version();
-	prev_playlist_version = playlist_state_get_hash(&g_playlist, pc);
+	prev_playlist_version = playlist_state_get_hash(&partition.playlist,
+							&partition.pc);
 }
 
 static void
-state_file_read(struct player_control *pc)
+state_file_read(Partition &partition)
 {
 	bool success;
 
@@ -95,14 +96,16 @@ state_file_read(struct player_control *pc)
 	while ((line = file.ReadLine()) != NULL) {
 		success = read_sw_volume_state(line) ||
 			audio_output_state_read(line) ||
-			playlist_state_restore(line, file, &g_playlist, pc);
+			playlist_state_restore(line, file, &partition.playlist,
+					       &partition.pc);
 		if (!success)
 			g_warning("Unrecognized line in state file: %s", line);
 	}
 
 	prev_volume_version = sw_volume_state_get_hash();
 	prev_output_version = audio_output_state_get_version();
-	prev_playlist_version = playlist_state_get_hash(&g_playlist, pc);
+	prev_playlist_version = playlist_state_get_hash(&partition.playlist,
+							&partition.pc);
 }
 
 /**
@@ -112,21 +115,22 @@ state_file_read(struct player_control *pc)
 static gboolean
 timer_save_state_file(gpointer data)
 {
-	struct player_control *pc = (struct player_control *)data;
+	Partition &partition = *(Partition *)data;
 
 	if (prev_volume_version == sw_volume_state_get_hash() &&
 	    prev_output_version == audio_output_state_get_version() &&
-	    prev_playlist_version == playlist_state_get_hash(&g_playlist, pc))
+	    prev_playlist_version == playlist_state_get_hash(&partition.playlist,
+							     &partition.pc))
 		/* nothing has changed - don't save the state file,
 		   don't spin up the hard disk */
 		return true;
 
-	state_file_write(pc);
+	state_file_write(partition);
 	return true;
 }
 
 void
-state_file_init(const char *path, struct player_control *pc)
+state_file_init(const char *path, Partition &partition)
 {
 	assert(state_file_path == NULL);
 
@@ -134,15 +138,15 @@ state_file_init(const char *path, struct player_control *pc)
 		return;
 
 	state_file_path = g_strdup(path);
-	state_file_read(pc);
+	state_file_read(partition);
 
 	save_state_source_id = g_timeout_add_seconds(5 * 60,
 						     timer_save_state_file,
-						     pc);
+						     &partition);
 }
 
 void
-state_file_finish(struct player_control *pc)
+state_file_finish(Partition &partition)
 {
 	if (state_file_path == NULL)
 		/* no state file configured, no cleanup required */
@@ -151,7 +155,7 @@ state_file_finish(struct player_control *pc)
 	if (save_state_source_id != 0)
 		g_source_remove(save_state_source_id);
 
-	state_file_write(pc);
+	state_file_write(partition);
 
 	g_free(state_file_path);
 }
diff --git a/src/StateFile.hxx b/src/StateFile.hxx
index 77629aba9..35269fe40 100644
--- a/src/StateFile.hxx
+++ b/src/StateFile.hxx
@@ -20,13 +20,13 @@
 #ifndef MPD_STATE_FILE_HXX
 #define MPD_STATE_FILE_HXX
 
-struct player_control;
+struct Partition;
 
 void
-state_file_init(const char *path, struct player_control *pc);
+state_file_init(const char *path, Partition &partition);
 
 void
-state_file_finish(struct player_control *pc);
+state_file_finish(Partition &partition);
 
 void write_state_file(void);
 
diff --git a/src/UpdateGlue.cxx b/src/UpdateGlue.cxx
index cb1600d4f..2edd19cc2 100644
--- a/src/UpdateGlue.cxx
+++ b/src/UpdateGlue.cxx
@@ -24,7 +24,6 @@
 #include "UpdateRemove.hxx"
 #include "Mapper.hxx"
 #include "DatabaseSimple.hxx"
-#include "Playlist.hxx"
 
 extern "C" {
 #include "event_pipe.h"
@@ -33,6 +32,7 @@ extern "C" {
 }
 
 #include "Main.hxx"
+#include "Partition.hxx"
 #include "mpd_error.h"
 
 #include <glib.h>
@@ -155,7 +155,7 @@ static void update_finished_event(void)
 
 	if (modified) {
 		/* send "idle" events */
-		playlist_increment_version_all(&g_playlist);
+		playlist_increment_version_all(&global_partition->playlist);
 		idle_add(IDLE_DATABASE);
 	}
 
diff --git a/src/UpdateRemove.cxx b/src/UpdateRemove.cxx
index 814c803b2..c1a0cd32b 100644
--- a/src/UpdateRemove.cxx
+++ b/src/UpdateRemove.cxx
@@ -20,6 +20,7 @@
 #include "config.h" /* must be first for large file support */
 #include "UpdateRemove.hxx"
 #include "Playlist.hxx"
+#include "Partition.hxx"
 
 extern "C" {
 #include "event_pipe.h"
@@ -63,7 +64,9 @@ song_remove_event(void)
 		sticker_song_delete(removed_song);
 #endif
 
-	playlist_delete_song(&g_playlist, global_player_control, removed_song);
+	playlist_delete_song(&global_partition->playlist,
+			     &global_partition->pc,
+			     removed_song);
 
 	/* clear "removed_song" and send signal to update thread */
 	g_mutex_lock(remove_mutex);