GNU Radio 3.4.0 C++ API
audio_osx_sink.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2006-2011 Free Software Foundation, Inc.
00004  * 
00005  * This file is part of GNU Radio.
00006  *
00007  * GNU Radio is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 3, or (at your option)
00010  * any later version.
00011  * 
00012  * GNU Radio is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with GNU Radio; see the file COPYING.  If not, write to
00019  * the Free Software Foundation, Inc., 51 Franklin Street,
00020  * Boston, MA 02110-1301, USA.
00021  */
00022 
00023 #ifndef INCLUDED_AUDIO_OSX_SINK_H
00024 #define INCLUDED_AUDIO_OSX_SINK_H
00025 
00026 #include <gr_audio_sink.h>
00027 #include <string>
00028 #include <list>
00029 #include <AudioUnit/AudioUnit.h>
00030 #include <circular_buffer.h>
00031 
00032 /*!
00033  * \brief audio sink using OSX
00034  *
00035  * input signature is one or two streams of floats.
00036  * Input samples must be in the range [-1,1].
00037  */
00038 
00039 class audio_osx_sink : public audio_sink {
00040 
00041   Float64             d_sample_rate;
00042   int                 d_channel_config;
00043   UInt32              d_n_channels;
00044   UInt32              d_queueSampleCount, d_max_sample_count;
00045   bool                d_do_block;
00046   gruel::mutex*       d_internal;
00047   gruel::condition_variable* d_cond_data;
00048   circular_buffer<float>** d_buffers;
00049 
00050 // AudioUnits and Such
00051   AudioUnit           d_OutputAU;
00052 
00053 public:
00054   audio_osx_sink (int sample_rate = 44100,
00055                   const std::string device_name = "2",
00056                   bool do_block = true,
00057                   int channel_config = -1,
00058                   int max_sample_count = -1);
00059 
00060   ~audio_osx_sink ();
00061 
00062   bool IsRunning ();
00063   bool start ();
00064   bool stop ();
00065 
00066   int work (int noutput_items,
00067             gr_vector_const_void_star &input_items,
00068             gr_vector_void_star &output_items);
00069 
00070 private:
00071   static OSStatus AUOutputCallback (void *inRefCon, 
00072                                     AudioUnitRenderActionFlags *ioActionFlags, 
00073                                     const AudioTimeStamp *inTimeStamp, 
00074                                     UInt32 inBusNumber, 
00075                                     UInt32 inNumberFrames, 
00076                                     AudioBufferList *ioData);
00077 };
00078 
00079 #endif /* INCLUDED_AUDIO_OSX_SINK_H */