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diff --git a/gr-audio-osx/src/audio_osx_sink.h b/gr-audio-osx/src/audio_osx_sink.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2006 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio.
+ *
+ * GNU Radio 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, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef INCLUDED_AUDIO_OSX_SINK_H
+#define INCLUDED_AUDIO_OSX_SINK_H
+
+#include <gr_sync_block.h>
+#include <string>
+#include <list>
+#include <AudioUnit/AudioUnit.h>
+#include <circular_buffer.h>
+
+class audio_osx_sink;
+typedef boost::shared_ptr<audio_osx_sink> audio_osx_sink_sptr;
+
+audio_osx_sink_sptr
+audio_osx_make_sink (int sample_rate = 44100,
+		     const std::string device_name = "2",
+		     bool do_block = true,
+		     int channel_config = -1,
+		     int max_sample_count = -1);
+
+/*!
+ * \brief audio sink using OSX
+ *
+ * input signature is one or two streams of floats.
+ * Input samples must be in the range [-1,1].
+ */
+
+class audio_osx_sink : public gr_sync_block {
+  friend audio_osx_sink_sptr
+  audio_osx_make_sink (int sample_rate,
+		       const std::string device_name,
+		       bool do_block,
+		       int channel_config,
+		       int max_sample_count);
+
+  Float64             d_sample_rate;
+  int                 d_channel_config;
+  UInt32              d_n_channels;
+  UInt32              d_queueSampleCount, d_max_sample_count;
+  bool                d_do_block;
+  mld_mutex_ptr       d_internal;
+  mld_condition_ptr   d_cond_data;
+  circular_buffer<float>** d_buffers;
+
+// AudioUnits and Such
+  AudioUnit           d_OutputAU;
+
+protected:
+  audio_osx_sink (int sample_rate = 44100,
+		  const std::string device_name = "2",
+		  bool do_block = true,
+		  int channel_config = -1,
+		  int max_sample_count = -1);
+
+public:
+  ~audio_osx_sink ();
+
+  bool IsRunning ();
+  bool start ();
+  bool stop ();
+
+  int work (int noutput_items,
+	    gr_vector_const_void_star &input_items,
+	    gr_vector_void_star &output_items);
+
+private:
+  static OSStatus AUOutputCallback (void *inRefCon, 
+				    AudioUnitRenderActionFlags *ioActionFlags, 
+				    const AudioTimeStamp *inTimeStamp, 
+				    UInt32 inBusNumber, 
+				    UInt32 inNumberFrames, 
+				    AudioBufferList *ioData);
+};
+
+#endif /* INCLUDED_AUDIO_OSX_SINK_H */