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authorTom Rondeau2011-04-08 15:37:29 -0400
committerTom Rondeau2011-04-08 15:37:29 -0400
commit21b64f070a3eb38ab044529a6ddd9cd6b6d0a2cb (patch)
tree4e72909a051b0a4ac428252d15f34b53bcc986b6 /gr-audio/lib/windows
parentd7093fd06d0ec37f6ba2841d202fe90f4fa3661e (diff)
parent5c358afd00347f5da7a59dd73ea79cd3df26659d (diff)
downloadgnuradio-21b64f070a3eb38ab044529a6ddd9cd6b6d0a2cb.tar.gz
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Merge branch 'master' into constell_obj
Conflicts: gnuradio-core/src/lib/filter/gr_pfb_clock_sync_ccf.h gr-audio-oss/src/Makefile.swig.gen gr-audio/swig/Makefile.swig.gen
Diffstat (limited to 'gr-audio/lib/windows')
-rw-r--r--gr-audio/lib/windows/audio_windows_sink.cc323
-rw-r--r--gr-audio/lib/windows/audio_windows_sink.h72
-rw-r--r--gr-audio/lib/windows/audio_windows_source.cc205
-rw-r--r--gr-audio/lib/windows/audio_windows_source.h56
4 files changed, 656 insertions, 0 deletions
diff --git a/gr-audio/lib/windows/audio_windows_sink.cc b/gr-audio/lib/windows/audio_windows_sink.cc
new file mode 100644
index 000000000..5284ce173
--- /dev/null
+++ b/gr-audio/lib/windows/audio_windows_sink.cc
@@ -0,0 +1,323 @@
+/* -*- c++ -*- */
+/*
+* Copyright 2004-2011 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 3, 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., 51 Franklin Street,
+* Boston, MA 02110-1301, USA.
+*/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gr_audio_registry.h"
+#include <audio_windows_sink.h>
+#include <gr_io_signature.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <iostream>
+#include <stdexcept>
+#include <string>
+#include <sstream>
+
+AUDIO_REGISTER_SINK(REG_PRIO_HIGH, windows)(
+ int sampling_rate, const std::string &device_name, bool
+){
+ return audio_sink::sptr(new audio_windows_sink(sampling_rate, device_name));
+}
+
+static const double CHUNK_TIME = 0.1; //0.001; // 100 ms
+
+// FIXME these should query some kind of user preference
+
+static std::string
+default_device_name ()
+{
+ return "WAVE_MAPPER";
+}
+
+audio_windows_sink::audio_windows_sink (int sampling_freq, const std::string device_name)
+ : gr_sync_block ("audio_windows_sink",
+ gr_make_io_signature (1, 2, sizeof (float)),
+ gr_make_io_signature (0, 0, 0)),
+ d_sampling_freq (sampling_freq),
+ d_device_name (device_name.empty ()? default_device_name () : device_name),
+ d_fd (-1), d_buffer (0), d_chunk_size (0)
+{
+ d_wave_write_event = CreateEvent (NULL, FALSE, FALSE, NULL);
+ if (open_waveout_device () < 0)
+ {
+ //fprintf (stderr, "audio_windows_sink:open_waveout_device() failed\n");
+ perror ("audio_windows_sink:open_waveout_device( ) failed\n");
+ throw
+ std::runtime_error ("audio_windows_sink:open_waveout_device() failed");
+ }
+
+ d_chunk_size = (int) (d_sampling_freq * CHUNK_TIME);
+ set_output_multiple (d_chunk_size);
+
+ d_buffer = new short[d_chunk_size * 2];
+
+}
+
+audio_windows_sink::~audio_windows_sink ()
+{
+ /* Free the callback Event */
+ CloseHandle (d_wave_write_event);
+ waveOutClose (d_h_waveout);
+ delete[]d_buffer;
+}
+
+int
+audio_windows_sink::work (int noutput_items,
+ gr_vector_const_void_star & input_items,
+ gr_vector_void_star & output_items)
+{
+ const float *f0, *f1;
+ bool playtestsound = false;
+ if (playtestsound)
+ {
+ // dummy
+
+ f0 = (const float *) input_items[0];
+
+ for (int i = 0; i < noutput_items; i += d_chunk_size)
+ {
+ for (int j = 0; j < d_chunk_size; j++)
+ {
+ d_buffer[2 * j + 0] = (short) (sin (2.0 * 3.1415926535897932384626 * (float) j * 1000.0 / (float) d_sampling_freq) * 8192 + 0); //+32767
+ d_buffer[2 * j + 1] = d_buffer[2 * j + 0];
+ }
+ f0 += d_chunk_size;
+ if (write_waveout
+ ((HPSTR) d_buffer, 2 * d_chunk_size * sizeof (short)) < 0)
+ {
+ fprintf (stderr, "audio_windows_sink: write failed\n");
+ perror ("audio_windows_sink: write failed");
+ }
+ }
+ // break;
+ }
+ else
+ {
+ switch (input_items.size ())
+ {
+
+ case 1: // mono input
+
+ f0 = (const float *) input_items[0];
+
+ for (int i = 0; i < noutput_items; i += d_chunk_size)
+ {
+ for (int j = 0; j < d_chunk_size; j++)
+ {
+ d_buffer[2 * j + 0] = (short) (f0[j] * 32767);
+ d_buffer[2 * j + 1] = (short) (f0[j] * 32767);
+ }
+ f0 += d_chunk_size;
+ if (write_waveout
+ ((HPSTR) d_buffer, 2 * d_chunk_size * sizeof (short)) < 0)
+ {
+ //fprintf (stderr, "audio_windows_sink: write failed\n");
+ perror ("audio_windows_sink: write failed");
+ }
+ }
+ break;
+
+ case 2: // stereo input
+
+ f0 = (const float *) input_items[0];
+ f1 = (const float *) input_items[1];
+
+ for (int i = 0; i < noutput_items; i += d_chunk_size)
+ {
+ for (int j = 0; j < d_chunk_size; j++)
+ {
+ d_buffer[2 * j + 0] = (short) (f0[j] * 32767);
+ d_buffer[2 * j + 1] = (short) (f1[j] * 32767);
+ }
+ f0 += d_chunk_size;
+ f1 += d_chunk_size;
+ if (write_waveout
+ ((HPSTR) d_buffer, 2 * d_chunk_size * sizeof (short)) < 0)
+ {
+ //fprintf (stderr, "audio_windows_sink: write failed\n");
+ perror ("audio_windows_sink: write failed");
+ }
+ }
+ break;
+ }
+ }
+ return noutput_items;
+}
+
+int
+audio_windows_sink::string_to_int (const std::string & s)
+{
+ int i;
+ std::istringstream (s) >> i;
+ return i;
+} //ToInt()
+
+int
+audio_windows_sink::open_waveout_device (void)
+{
+
+ UINT /*UINT_PTR */ u_device_id;
+ /** Identifier of the waveform-audio output device to open. It can be either a device identifier or a handle of an open waveform-audio input device. You can use the following flag instead of a device identifier.
+ *
+ * Value Meaning
+ * WAVE_MAPPER The function selects a waveform-audio output device capable of playing the given format.
+ */
+ if (d_device_name.empty () || default_device_name () == d_device_name)
+ u_device_id = WAVE_MAPPER;
+ else
+ u_device_id = (UINT) string_to_int (d_device_name);
+ // Open a waveform device for output using event callback.
+
+ unsigned long result;
+ //HWAVEOUT outHandle;
+ WAVEFORMATEX wave_format;
+
+ /* Initialize the WAVEFORMATEX for 16-bit, 44KHz, stereo */
+ wave_format.wFormatTag = WAVE_FORMAT_PCM;
+ wave_format.nChannels = 2;
+ wave_format.nSamplesPerSec = d_sampling_freq; //44100;
+ wave_format.wBitsPerSample = 16;
+ wave_format.nBlockAlign =
+ wave_format.nChannels * (wave_format.wBitsPerSample / 8);
+ wave_format.nAvgBytesPerSec =
+ wave_format.nSamplesPerSec * wave_format.nBlockAlign;
+ wave_format.cbSize = 0;
+
+ /* Open the (preferred) Digital Audio Out device. */
+ result = waveOutOpen (&d_h_waveout, WAVE_MAPPER, &wave_format, (DWORD_PTR) d_wave_write_event, 0, CALLBACK_EVENT | WAVE_ALLOWSYNC); //|WAVE_FORMAT_DIRECT | CALLBACK_EVENT| WAVE_ALLOWSYNC
+ if (result)
+ {
+ fprintf (stderr,
+ "audio_windows_sink: Failed to open waveform output device.\n");
+ perror ("audio_windows_sink: Failed to open waveform output device.");
+ //LocalUnlock(hFormat);
+ //LocalFree(hFormat);
+ //mmioClose(hmmio, 0);
+ return -1;
+ }
+
+ //
+ // Do not Swallow the "open" event.
+ //
+ //WaitForSingleObject(d_wave_write_event, INFINITE);
+
+ // Allocate and lock memory for the header.
+
+ d_h_wave_hdr = GlobalAlloc (GMEM_MOVEABLE | GMEM_SHARE,
+ (DWORD) sizeof (WAVEHDR));
+ if (d_h_wave_hdr == NULL)
+ {
+ //GlobalUnlock(hData);
+ //GlobalFree(hData);
+ //fprintf (stderr, "audio_windows_sink: Not enough memory for header.\n");
+ perror ("audio_windows_sink: Not enough memory for header.");
+ return -1;
+ }
+
+ d_lp_wave_hdr = (LPWAVEHDR) GlobalLock (d_h_wave_hdr);
+ if (d_lp_wave_hdr == NULL)
+ {
+ //GlobalUnlock(hData);
+ //GlobalFree(hData);
+ //fprintf (stderr, "audio_windows_sink: Failed to lock memory for header.\n");
+ perror ("audio_windows_sink: Failed to lock memory for header.");
+ return -1;
+ }
+ //d_lp_wave_hdr->dwFlags = WHDR_DONE;
+ return 0;
+}
+
+int
+audio_windows_sink::write_waveout (HPSTR lp_data, DWORD dw_data_size)
+{
+ UINT w_result;
+ int teller = 100;
+ // After allocation, set up and prepare header.
+ /*while ((d_lp_wave_hdr->dwFlags & WHDR_DONE)==0 && teller>0)
+ {
+ teller--;
+ Sleep(1);
+ } */
+ // Wait until previous wave write completes (first event is the open event).
+ WaitForSingleObject (d_wave_write_event, 100); //INFINITE
+ d_lp_wave_hdr->lpData = lp_data;
+ d_lp_wave_hdr->dwBufferLength = dw_data_size;
+ d_lp_wave_hdr->dwFlags = 0L;
+ /* Clear the WHDR_DONE bit (which the driver set last time that
+ this WAVEHDR was sent via waveOutWrite and was played). Some
+ drivers need this to be cleared */
+ //d_lp_wave_hdr->dwFlags &= ~WHDR_DONE;
+
+ d_lp_wave_hdr->dwLoops = 0L;
+ w_result =
+ waveOutPrepareHeader (d_h_waveout, d_lp_wave_hdr, sizeof (WAVEHDR));
+ if (w_result != 0)
+ {
+ //GlobalUnlock( hData);
+ //GlobalFree(hData);
+ //fprintf (stderr, "audio_windows_sink: Failed to waveOutPrepareHeader. error %i\n",w_result);
+ perror ("audio_windows_sink: Failed to waveOutPrepareHeader");
+ }
+ // Now the data block can be sent to the output device. The
+ // waveOutWrite function returns immediately and waveform
+ // data is sent to the output device in the background.
+ //while (! readyforplayback) Sleep(1);
+ //readyforplayback=false;
+ //
+ //
+
+ w_result = waveOutWrite (d_h_waveout, d_lp_wave_hdr, sizeof (WAVEHDR));
+ if (w_result != 0)
+ {
+ //GlobalUnlock( hData);
+ //GlobalFree(hData);
+ //fprintf (stderr, "audio_windows_sink: Failed to write block to device.error %i\n",w_result);
+ perror ("audio_windows_sink: Failed to write block to device");
+ switch (w_result)
+ {
+ case MMSYSERR_INVALHANDLE:
+ fprintf (stderr, "Specified device handle is invalid. \n");
+ break;
+ case MMSYSERR_NODRIVER:
+ fprintf (stderr, " No device driver is present. \n");
+ break;
+ case MMSYSERR_NOMEM:
+ fprintf (stderr, " Unable to allocate or lock memory. \n");
+ break;
+ case WAVERR_UNPREPARED:
+ fprintf (stderr,
+ " The data block pointed to by the pwh parameter hasn't been prepared. \n");
+ break;
+ default:
+ fprintf (stderr, "Unknown error %i\n", w_result);
+ }
+ waveOutUnprepareHeader (d_h_waveout, d_lp_wave_hdr, sizeof (WAVEHDR));
+ return -1;
+ }
+ // WaitForSingleObject(d_wave_write_event, INFINITE);
+ return 0;
+}
diff --git a/gr-audio/lib/windows/audio_windows_sink.h b/gr-audio/lib/windows/audio_windows_sink.h
new file mode 100644
index 000000000..6819bd448
--- /dev/null
+++ b/gr-audio/lib/windows/audio_windows_sink.h
@@ -0,0 +1,72 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004-2011 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 3, 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., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_AUDIO_WINDOWS_SINK_H
+#define INCLUDED_AUDIO_WINDOWS_SINK_H
+
+#define WIN32_LEAN_AND_MEAN
+#define NOMINMAX // stops windef.h defining max/min under cygwin
+
+#include <windows.h>
+#include <mmsystem.h>
+
+#include <gr_audio_sink.h>
+#include <string>
+
+/*!
+ * \brief audio sink using winmm mmsystem (win32 only)
+ *
+ * input signature is one or two streams of floats.
+ * Input samples must be in the range [-1,1].
+ */
+
+class audio_windows_sink : public audio_sink
+{
+ int d_sampling_freq;
+ std::string d_device_name;
+ int d_fd;
+ short *d_buffer;
+ int d_chunk_size;
+ HWAVEOUT d_h_waveout;
+ HGLOBAL d_h_wave_hdr;
+ LPWAVEHDR d_lp_wave_hdr;
+ HANDLE d_wave_write_event;
+
+protected:
+ int
+ string_to_int (const std::string & s);
+ int
+ open_waveout_device (void);
+ int
+ write_waveout (HPSTR lp_data, DWORD dw_data_size);
+
+public:
+ audio_windows_sink (int sampling_freq, const std::string device_name = "");
+ ~audio_windows_sink ();
+
+ int
+ work (int noutput_items,
+ gr_vector_const_void_star & input_items,
+ gr_vector_void_star & output_items);
+};
+
+#endif /* INCLUDED_AUDIO_WINDOWS_SINK_H */
diff --git a/gr-audio/lib/windows/audio_windows_source.cc b/gr-audio/lib/windows/audio_windows_source.cc
new file mode 100644
index 000000000..75b0a33bb
--- /dev/null
+++ b/gr-audio/lib/windows/audio_windows_source.cc
@@ -0,0 +1,205 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004-2011 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 3, 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., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gr_audio_registry.h"
+#include <audio_windows_source.h>
+#include <gr_io_signature.h>
+//include <sys/soundcard.h>
+//include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <iostream>
+#include <stdexcept>
+
+AUDIO_REGISTER_SOURCE(REG_PRIO_HIGH, windows)(
+ int sampling_rate, const std::string &device_name, bool
+){
+ return audio_source::sptr(new audio_windows_source(sampling_rate, device_name));
+}
+
+static const double CHUNK_TIME = 0.005; // 5 ms
+
+// FIXME these should query some kind of user preference
+
+static std::string
+default_device_name ()
+{
+ return "/dev/dsp";
+}
+
+audio_windows_source::audio_windows_source (int sampling_freq, const std::string device_name)
+ : gr_sync_block ("audio_windows_source",
+ gr_make_io_signature (0, 0, 0),
+ gr_make_io_signature (1, 2, sizeof (float))),
+ d_sampling_freq (sampling_freq),
+ d_device_name (device_name.empty ()? default_device_name () : device_name),
+ d_fd (-1), d_buffer (0), d_chunk_size (0)
+{
+ //FIXME TODO implement me
+#if 0
+ if ((d_fd = open (d_device_name.c_str (), O_RDONLY)) < 0)
+ {
+ fprintf (stderr, "audio_windows_source: ");
+ perror (d_device_name.c_str ());
+ throw
+ std::runtime_error ("audio_windows_source");
+ }
+
+ d_chunk_size = (int) (d_sampling_freq * CHUNK_TIME);
+ set_output_multiple (d_chunk_size);
+
+ d_buffer = new short[d_chunk_size * 2];
+
+ int format = AFMT_S16_NE;
+ int orig_format = format;
+ if (ioctl (d_fd, SNDCTL_DSP_SETFMT, &format) < 0)
+ {
+ std::
+ cerr << "audio_windows_source: " << d_device_name <<
+ " ioctl failed\n";
+ perror (d_device_name.c_str ());
+ throw
+ std::runtime_error ("audio_windows_source");
+ }
+
+ if (format != orig_format)
+ {
+ fprintf (stderr, "audio_windows_source: unable to support format %d\n",
+ orig_format);
+ fprintf (stderr, " card requested %d instead.\n", format);
+ }
+
+ // set to stereo no matter what. Some hardware only does stereo
+ int channels = 2;
+ if (ioctl (d_fd, SNDCTL_DSP_CHANNELS, &channels) < 0 || channels != 2)
+ {
+ perror ("audio_windows_source: could not set STEREO mode");
+ throw
+ std::runtime_error ("audio_windows_source");
+ }
+
+ // set sampling freq
+ int sf = sampling_freq;
+ if (ioctl (d_fd, SNDCTL_DSP_SPEED, &sf) < 0)
+ {
+ std::cerr << "audio_windows_source: "
+ << d_device_name << ": invalid sampling_freq "
+ << sampling_freq << "\n";
+ sampling_freq = 8000;
+ if (ioctl (d_fd, SNDCTL_DSP_SPEED, &sf) < 0)
+ {
+ std::
+ cerr <<
+ "audio_windows_source: failed to set sampling_freq to 8000\n";
+ throw
+ std::runtime_error ("audio_windows_source");
+ }
+ }
+#endif
+}
+
+audio_windows_source::~audio_windows_source ()
+{
+ /*close (d_fd);
+ delete [] d_buffer;
+ */
+}
+
+int
+audio_windows_source::work (int noutput_items,
+ gr_vector_const_void_star & input_items,
+ gr_vector_void_star & output_items)
+{
+ //FIXME TODO implement me
+#if 0
+ float *f0 = (float *) output_items[0];
+ float *f1 = (float *) output_items[1]; // will be invalid if this is mono output
+
+ const int shorts_per_item = 2; // L + R
+ const int bytes_per_item = shorts_per_item * sizeof (short);
+
+ // To minimize latency, never return more than CHUNK_TIME
+ // worth of samples per call to work.
+ // FIXME, we need an API to set this value
+
+ noutput_items = std::min (noutput_items, d_chunk_size);
+
+ int base = 0;
+ int ntogo = noutput_items;
+
+ while (ntogo > 0)
+ {
+ int nbytes = std::min (ntogo, d_chunk_size) * bytes_per_item;
+ int result_nbytes = read (d_fd, d_buffer, nbytes);
+
+ if (result_nbytes < 0)
+ {
+ perror ("audio_windows_source");
+ return -1; // say we're done
+ }
+
+ if ((result_nbytes & (bytes_per_item - 1)) != 0)
+ {
+ fprintf (stderr, "audio_windows_source: internal error.\n");
+ throw std::runtime_error ("internal error");
+ }
+
+ int result_nitems = result_nbytes / bytes_per_item;
+
+ // now unpack samples into output streams
+
+ switch (output_items.size ())
+ {
+ case 1: // mono output
+ for (int i = 0; i < result_nitems; i++)
+ {
+ f0[base + i] = d_buffer[2 * i + 0] * (1.0 / 32767);
+ }
+ break;
+
+ case 2: // stereo output
+ for (int i = 0; i < result_nitems; i++)
+ {
+ f0[base + i] = d_buffer[2 * i + 0] * (1.0 / 32767);
+ f1[base + i] = d_buffer[2 * i + 1] * (1.0 / 32767);
+ }
+ break;
+
+ default:
+ assert (0);
+ }
+
+ ntogo -= result_nitems;
+ base += result_nitems;
+ }
+
+ return noutput_items - ntogo;
+#endif
+ return -1; // EOF
+}
diff --git a/gr-audio/lib/windows/audio_windows_source.h b/gr-audio/lib/windows/audio_windows_source.h
new file mode 100644
index 000000000..36311968d
--- /dev/null
+++ b/gr-audio/lib/windows/audio_windows_source.h
@@ -0,0 +1,56 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004-2011 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 3, 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., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_AUDIO_WINDOWS_SOURCE_H
+#define INCLUDED_AUDIO_WINDOWS_SOURCE_H
+
+#include <gr_audio_source.h>
+#include <string>
+
+/*!
+ * \brief audio source using winmm mmsystem (win32 only)
+ *
+ * Output signature is one or two streams of floats.
+ * Output samples will be in the range [-1,1].
+ */
+
+class audio_windows_source : public audio_source
+{
+
+ int d_sampling_freq;
+ std::string d_device_name;
+ int d_fd;
+ short *d_buffer;
+ int d_chunk_size;
+
+public:
+ audio_windows_source (int sampling_freq, const std::string device_name = "");
+
+ ~audio_windows_source ();
+
+ int
+ work (int noutput_items,
+ gr_vector_const_void_star & input_items,
+ gr_vector_void_star & output_items);
+};
+
+#endif /* INCLUDED_AUDIO_WINDOWS_SOURCE_H */