BACKENDS: Unify AudioCD manager instantiation

2 files changed, 35 insertions, 2 deletions

diff --git a/common/system.cpp b/common/system.cpp
index 34fc076492..dcdc38c0db 100644
--- a/common/system.cpp
+++ b/common/system.cpp
@@ -26,6 +26,9 @@
 
 #include "common/system.h"
 #include "common/str.h"
+#include "common/textconsole.h"
+
+#include "backends/audiocd/default/default-audiocd.h"
 
 #ifdef __PLAYSTATION2__
 	// for those replaced fopen/fread/etc functions
@@ -45,9 +48,20 @@
 OSystem *g_system = 0;
 
 OSystem::OSystem() {
+	_audiocdManager = 0;
 }
 
 OSystem::~OSystem() {
+	delete _audiocdManager;
+}
+
+void OSystem::initBackend() {
+#ifndef DISABLE_DEFAULT_AUDIOCD_MANAGER
+	if (!_audiocdManager)
+		_audiocdManager = new DefaultAudioCDManager();
+#endif
+	if (!_audiocdManager)
+		error("Backend failed to instantiate AudioCD manager");
 }
 
 bool OSystem::setGraphicsMode(const char *name) {
diff --git a/common/system.h b/common/system.h
index 243343ce0d..4b85f143b7 100644
--- a/common/system.h
+++ b/common/system.h
@@ -96,6 +96,23 @@ protected:
 	OSystem();
 	virtual ~OSystem();
 
+protected:
+	/**
+	 * For backend authors only, this pointer may be set by OSystem
+	 * subclasses to an AudioCDManager instance. This is only useful
+	 * if your backend does not want to use the DefaultAudioCDManager.
+	 *
+	 * This instance is returned by OSystem::getAudioCDManager(),
+	 * and it is deleted by the OSystem destructor.
+	 *
+	 * A backend may set this pointer in its initBackend() method,
+	 * its constructor or somewhere in between; but it must
+	 * set it no later than in its initBackend() implementation, because
+	 * OSystem::initBackend() will by default create a DefaultAudioCDManager
+	 * instance if _audiocdManager has not yet been set.
+	 */
+	AudioCDManager *_audiocdManager;
+
 public:
 
 	/**
@@ -106,7 +123,7 @@ public:
 	 *       parent class. They should do so near the end of their own
 	 *       implementation.
 	 */
-	virtual void initBackend() { }
+	virtual void initBackend();
 
 	/**
 	 * Allows the backend to perform engine specific init.
@@ -921,7 +938,9 @@ public:
 	 * Return the audio cd manager. For more information, refer to the
 	 * AudioCDManager documentation.
 	 */
-	virtual AudioCDManager *getAudioCDManager() = 0;
+	inline AudioCDManager *getAudioCDManager() {
+		return _audiocdManager;
+	}
 
 	//@}