Houston, we have a trunk.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@3122 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 161 insertions, 0 deletions

diff --git a/gr-audio-oss/src/audio_oss_sink.cc b/gr-audio-oss/src/audio_oss_sink.cc
new file mode 100644
index 000000000..eff3de496
--- /dev/null
+++ b/gr-audio-oss/src/audio_oss_sink.cc
@@ -0,0 +1,161 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 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 2, 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <audio_oss_sink.h>
+#include <gr_io_signature.h>
+#include <gr_prefs.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>
+
+
+static std::string
+default_device_name ()
+{
+  return gr_prefs::singleton()->get_string("audio_oss", "default_output_device", "/dev/dsp");
+}
+
+audio_oss_sink_sptr
+audio_oss_make_sink (int sampling_rate, const std::string dev, bool ok_to_block)
+{
+  return audio_oss_sink_sptr (new audio_oss_sink (sampling_rate, dev, ok_to_block));
+}
+
+audio_oss_sink::audio_oss_sink (int sampling_rate,
+				const std::string device_name,
+				bool ok_to_block)
+  : gr_sync_block ("audio_oss_sink",
+		   gr_make_io_signature (1, 2, sizeof (float)),
+		   gr_make_io_signature (0, 0, 0)),
+    d_sampling_rate (sampling_rate),
+    d_device_name (device_name.empty() ? default_device_name() : device_name),
+    d_fd (-1), d_buffer (0), d_chunk_size (0)
+{
+  if ((d_fd = open (d_device_name.c_str (), O_WRONLY)) < 0){
+    fprintf (stderr, "audio_oss_sink: ");
+    perror (d_device_name.c_str ());
+    throw std::runtime_error ("audio_oss_sink");
+  }
+
+  double CHUNK_TIME = 
+    std::max(0.001, gr_prefs::singleton()->get_double("audio_oss", "latency", 0.005));
+
+  d_chunk_size = (int) (d_sampling_rate * 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_oss_sink: " << d_device_name << " ioctl failed\n";
+    perror (d_device_name.c_str ());
+    throw std::runtime_error ("audio_oss_sink");
+  }
+
+  if (format != orig_format){
+    fprintf (stderr, "audio_oss_sink: 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_oss_sink: could not set STEREO mode");
+    throw std::runtime_error ("audio_oss_sink");
+  }
+
+  // set sampling freq
+  int sf = sampling_rate;
+  if (ioctl (d_fd, SNDCTL_DSP_SPEED, &sf) < 0){
+    std::cerr << "audio_oss_sink: "
+	      << d_device_name << ": invalid sampling_rate "
+	      << sampling_rate << "\n";
+    sampling_rate = 8000;
+    if (ioctl (d_fd, SNDCTL_DSP_SPEED, &sf) < 0){
+      std::cerr << "audio_oss_sink: failed to set sampling_rate to 8000\n";
+      throw std::runtime_error ("audio_oss_sink");
+    }
+  }
+}
+
+audio_oss_sink::~audio_oss_sink ()
+{
+  close (d_fd);
+  delete [] d_buffer;
+}
+
+
+int
+audio_oss_sink::work (int noutput_items,
+		      gr_vector_const_void_star &input_items,
+		      gr_vector_void_star &output_items)
+{
+  const float  *f0, *f1;
+  
+  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 (d_fd, d_buffer, 2 * d_chunk_size * sizeof (short)) < 0)
+	perror ("audio_oss_sink: write");
+    }
+    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 (d_fd, d_buffer, 2 * d_chunk_size * sizeof (short)) < 0)
+	perror ("audio_oss_sink: write");
+    }
+    break;
+  }
+
+  return noutput_items;
+}