1 files changed, 97 insertions, 0 deletions
diff --git a/gr-cvsd-vocoder/src/lib/cvsd_decode_bs.h b/gr-cvsd-vocoder/src/lib/cvsd_decode_bs.h
new file mode 100644
index 000000000..d23c20e30
--- /dev/null
+++ b/gr-cvsd-vocoder/src/lib/cvsd_decode_bs.h
@@ -0,0 +1,97 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2007 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., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+#ifndef INCLUDED_CVSD_DECODE_BS_H
+#define INCLUDED_CVSD_DECODE_BS_H
+
+#include <gr_sync_interpolator.h>
+
+class cvsd_decode_bs;
+
+typedef boost::shared_ptr<cvsd_decode_bs> cvsd_decode_bs_sptr;
+
+cvsd_decode_bs_sptr cvsd_make_decode_bs (short min_step=10,
+					   short max_step=1280,
+					   double step_decay=0.9990234375,
+					   double accum_decay= 0.96875,
+					   int K=32,
+					   int J=4,
+					   short pos_accum_max=32767,
+					   short neg_accum_max=-32767);
+
+class cvsd_decode_bs : public gr_sync_interpolator
+{
+private:
+  friend cvsd_decode_bs_sptr cvsd_make_decode_bs (short min_step,
+						  short max_step,
+						  double step_decay,
+						  double accum_decay,
+						  int K,
+						  int J,
+						  short pos_accum_max,
+						  short neg_accum_max);
+
+  cvsd_decode_bs (short min_step, short max_step, double step_decay,
+		  double accum_decay, int K, int J,
+		  short pos_accum_max, short neg_accum_max);
+
+  int cvsd_round(double input);
+  unsigned int cvsd_pow (short radix, short power);
+  unsigned char cvsd_bitwise_sum (unsigned int input);
+
+  short d_min_step;
+  short d_max_step;
+  double d_step_decay;
+  double d_accum_decay;
+
+  //! \brief Size of shift register; the number of output bits remembered in shift register
+  int d_K;
+
+  //! \brief Number of bits in the shift register that are equal; size of run of 1s, 0s
+  int d_J;
+
+  short d_pos_accum_max;
+  short d_neg_accum_max;
+
+  int d_accum;
+  int d_loop_counter;
+  unsigned int d_runner;
+  unsigned int d_runner_mask;	 // 4 bytes, 0 .. 4,294,967,295
+  short d_stepsize;
+
+ public:
+  ~cvsd_decode_bs ();	// public destructor
+
+  short min_step() { return d_min_step; }
+  short max_step() { return d_max_step; }
+  double step_decay() { return d_step_decay; }
+  double accum_decay() { return d_accum_decay; }
+  int K() { return d_K; }
+  int J() { return d_J; }
+  short pos_accum_max() { return d_pos_accum_max; }
+  short neg_accum_max() { return d_neg_accum_max; }
+
+  int work (int noutput_items,
+	    gr_vector_const_void_star &input_items,
+	    gr_vector_void_star &output_items);
+};
+
+#endif /* INCLUDED_CVSD_DECODE_BS_H */