audio: added windows and osx audio source files

1 files changed, 205 insertions, 0 deletions

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..4b657a0e3
--- /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)
+  : audio_source ("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
+}