output: moved code from audioOutput.c to output_control.c

Similar to decoder_control.c, output_control.c will provide functions
for controlling the output thread (which will be implemented later).

src/output_control.h

@@ -0,0 +1,41 @@
+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
+ * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef OUTPUT_CONTROL_H
+#define OUTPUT_CONTROL_H
+
+#include "conf.h"
+#include "os_compat.h"
+
+struct audio_output;
+struct audio_output_plugin;
+struct audio_format;
+struct tag;
+
+int initAudioOutput(struct audio_output *, ConfigParam * param);
+int openAudioOutput(struct audio_output *audioOutput,
+		    const struct audio_format *audioFormat);
+int playAudioOutput(struct audio_output *audioOutput,
+		    const char *playChunk, size_t size);
+void dropBufferedAudioOutput(struct audio_output *audioOutput);
+void closeAudioOutput(struct audio_output *audioOutput);
+void finishAudioOutput(struct audio_output *audioOutput);
+void sendMetadataToAudioOutput(struct audio_output *audioOutput,
+			       const struct tag *tag);
+
+#endif