GNU Radio 3.5.1 C++ API
audio_portaudio_source.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 #ifndef INCLUDED_AUDIO_PORTAUDIO_SOURCE_H
00023 #define INCLUDED_AUDIO_PORTAUDIO_SOURCE_H
00024 
00025 #include <gr_audio_source.h>
00026 #include <gr_buffer.h>
00027 #include <gruel/thread.h>
00028 #include <string>
00029 #include <portaudio.h>
00030 #include <stdexcept>
00031 
00032 PaStreamCallback portaudio_source_callback;
00033 
00034 
00035 /*!
00036  * \brief Audio source using PORTAUDIO
00037  * \ingroup audio_blk
00038  *
00039  * Input samples must be in the range [-1,1].
00040  */
00041 class audio_portaudio_source : public audio_source {
00042 
00043   friend PaStreamCallback portaudio_source_callback;
00044 
00045 
00046   unsigned int          d_sampling_rate;
00047   std::string           d_device_name;
00048   bool                  d_ok_to_block;
00049   bool                  d_verbose;
00050 
00051   unsigned int          d_portaudio_buffer_size_frames; // number of frames in a portaudio buffer
00052 
00053   PaStream              *d_stream;
00054   PaStreamParameters    d_input_parameters;
00055 
00056   gr_buffer_sptr        d_writer;               // buffer used between work and callback
00057   gr_buffer_reader_sptr d_reader;
00058 
00059   gruel::mutex          d_ringbuffer_mutex;
00060   gruel::condition_variable d_ringbuffer_cond;
00061   bool                  d_ringbuffer_ready;
00062 
00063   // random stats
00064   int                   d_noverruns;            // count of overruns
00065 
00066   void output_error_msg (const char *msg, int err);
00067   void bail (const char *msg, int err) throw (std::runtime_error);
00068   void create_ringbuffer();
00069 
00070 
00071 public:
00072   audio_portaudio_source (int sampling_rate, const std::string device_name,
00073                           bool ok_to_block);
00074 
00075   ~audio_portaudio_source ();
00076   
00077   bool check_topology (int ninputs, int noutputs);
00078 
00079   int work (int ninput_items,
00080             gr_vector_const_void_star &input_items,
00081             gr_vector_void_star &output_items);
00082 };
00083 
00084 #endif /* INCLUDED_AUDIO_PORTAUDIO_SOURCE_H */