1 files changed, 23 insertions, 22 deletions
diff --git a/src/audiooutputengine.h b/src/audiooutputengine.h
index df8b0ee..338b5cd 100644
--- a/src/audiooutputengine.h
+++ b/src/audiooutputengine.h
@@ -24,39 +24,40 @@
  *  along with DrumGizmo; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
  */
-#ifndef __DRUMGIZMO_AUDIOOUTPUTENGINE_H__
-#define __DRUMGIZMO_AUDIOOUTPUTENGINE_H__
+#pragma once
 
+#include <cstddef>
 #include <string>
-#include <stdlib.h>
+
 #include <audiotypes.h>
 
 #include "channel.h"
 
-class AudioOutputEngine {
+class AudioOutputEngine
+{
 public:
-  virtual ~AudioOutputEngine() {}
+	virtual ~AudioOutputEngine() = default;
 
-  virtual bool init(const Channels& channels) = 0;
+	virtual bool init(const Channels& channels) = 0;
 
-  virtual void setParm(const std::string& parm, const std::string& value) = 0;
+	virtual void setParm(const std::string& parm, const std::string& value) = 0;
 
-  virtual bool start() = 0;
-  virtual void stop() = 0;
+	virtual bool start() = 0;
+	virtual void stop() = 0;
 
-  virtual void pre(size_t nsamples) = 0;
-  virtual void run(int ch, sample_t *samples, size_t nsamples) = 0;
-  virtual void post(size_t nsamples) = 0;
+	virtual void pre(std::size_t nsamples) = 0;
+	virtual void run(int ch, sample_t *samples, std::size_t nsamples) = 0;
+	virtual void post(std::size_t nsamples) = 0;
 
-  // Reimplement this if you wish to use internal buffer directly.
-  virtual sample_t *getBuffer(int ch) const { return NULL; }
+	//! Overload this method to use internal buffer directly.
+	virtual sample_t *getBuffer(int ch) const { return NULL; }
 
-  /*
-   * Overload this method to force engine to use different buffer size.
-   */
-  virtual size_t getBufferSize() const { return 1024; }
-  
-  virtual size_t getSamplerate() const { return 44100; }
-};
+	//! Overload this method to force engine to use different buffer size.
+	virtual std::size_t getBufferSize() const { return 1024; }
 
-#endif/*__DRUMGIZMO_AUDIOOUTPUTENGINE_H__*/
+	virtual std::size_t getSamplerate() const { return 44100; }
+
+	//! Overload this method to get notification of latency changes.
+	//! \param latency The new latency in samples.
+	virtual void onLatencyChange(std::size_t latency) {}
+};