GNU Radio 3.5.1 C++ API
audio_windows_sink.h
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00001 /* -*- c++ -*- */
00002 /*
00003  * Copyright 2004-2011 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_WINDOWS_SINK_H
00024 #define INCLUDED_AUDIO_WINDOWS_SINK_H
00025 
00026 #define WIN32_LEAN_AND_MEAN
00027 #define NOMINMAX                // stops windef.h defining max/min under cygwin
00028 
00029 #include <windows.h>
00030 #include <mmsystem.h>
00031 
00032 #include <gr_audio_sink.h>
00033 #include <string>
00034 
00035 /*!
00036  * \brief audio sink using winmm mmsystem (win32 only)
00037  * \ingroup audio_blk
00038  *
00039  * input signature is one or two streams of floats.
00040  * Input samples must be in the range [-1,1].
00041  */
00042 
00043 class audio_windows_sink : public audio_sink
00044 {
00045   int           d_sampling_freq;
00046   std::string   d_device_name;
00047   int           d_fd;
00048   short        *d_buffer;
00049   int           d_chunk_size;
00050   HWAVEOUT      d_h_waveout;
00051   HGLOBAL       d_h_wave_hdr;
00052   LPWAVEHDR     d_lp_wave_hdr;
00053   HANDLE        d_wave_write_event;
00054 
00055 protected:
00056   int
00057   string_to_int (const std::string & s);
00058   int
00059   open_waveout_device (void);
00060   int
00061   write_waveout (HPSTR lp_data, DWORD dw_data_size);
00062 
00063 public:
00064   audio_windows_sink (int sampling_freq, const std::string device_name = "");
00065   ~audio_windows_sink ();
00066 
00067   int
00068   work (int noutput_items,
00069         gr_vector_const_void_star & input_items,
00070         gr_vector_void_star & output_items);
00071 };
00072 
00073 #endif /* INCLUDED_AUDIO_WINDOWS_SINK_H */