From 7bee8dfbe234c8caf0c1033ebd71040355fcb838 Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Sun, 6 Jan 2013 18:49:07 -0500
Subject: vocoder: converting to private impl format.
---
gr-vocoder/lib/cvsd_decode_bs_impl.cc | 192 ++++++++++++++++++++++++++++++++++
1 file changed, 192 insertions(+)
create mode 100644 gr-vocoder/lib/cvsd_decode_bs_impl.cc
(limited to 'gr-vocoder/lib/cvsd_decode_bs_impl.cc')
diff --git a/gr-vocoder/lib/cvsd_decode_bs_impl.cc b/gr-vocoder/lib/cvsd_decode_bs_impl.cc
new file mode 100644
index 0000000000..e7f284adda
--- /dev/null
+++ b/gr-vocoder/lib/cvsd_decode_bs_impl.cc
@@ -0,0 +1,192 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2007,2010,2011,2013 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 "cvsd_decode_bs_impl.h"
+#include <gr_io_signature.h>
+#include <limits.h>
+
+namespace gr {
+ namespace vocoder {
+
+ cvsd_decode_bs::sptr
+ cvsd_decode_bs::make(short min_step, short max_step, double step_decay,
+ double accum_decay, int K, int J,
+ short pos_accum_max, short neg_accum_max)
+ {
+ return gnuradio::get_initial_sptr
+ (new cvsd_decode_bs_impl(min_step, max_step,
+ step_decay, accum_decay, K, J,
+ pos_accum_max, neg_accum_max));
+ }
+
+ cvsd_decode_bs_impl::cvsd_decode_bs_impl(short min_step, short max_step, double step_decay,
+ double accum_decay, int K, int J,
+ short pos_accum_max, short neg_accum_max)
+ : gr_sync_interpolator("vocoder_cvsd_decode_bs",
+ gr_make_io_signature(1, 1, sizeof(unsigned char)),
+ gr_make_io_signature(1, 1, sizeof(short)),
+ 8),
+ d_min_step(min_step), d_max_step(max_step), d_step_decay(step_decay),
+ d_accum_decay(accum_decay), d_K(K), d_J(J),
+ d_pos_accum_max(pos_accum_max), d_neg_accum_max(neg_accum_max),
+ d_accum(0),
+ d_loop_counter(1),
+ d_runner(0),
+ d_runner_mask(0),
+ d_stepsize(min_step)
+ {
+ if(d_K > 32)
+ throw std::runtime_error("cvsd_decode_bs_impl: K must be <= 32\n");
+
+ if(d_J > d_K)
+ throw std::runtime_error("cvsd_decode_bs_impl: J must be <= K\n");
+ }
+
+ cvsd_decode_bs_impl::~cvsd_decode_bs_impl()
+ {
+ // nothing else required in this example
+ }
+
+ unsigned char
+ cvsd_decode_bs_impl::cvsd_bitwise_sum(unsigned int input)
+ {
+ unsigned int temp = input;
+ unsigned char bits = 0;
+
+ while(temp) {
+ temp=temp&(temp-1);
+ bits++;
+ }
+ return bits;
+ }
+
+ int
+ cvsd_decode_bs_impl::cvsd_round(double input)
+ {
+ double temp;
+ temp=input+0.5;
+ temp=floor(temp);
+
+ return (int)temp;
+ }
+
+ unsigned int
+ cvsd_decode_bs_impl::cvsd_pow(short radix, short power)
+ {
+ double d_radix = (double) radix;
+ int i_power = (int) power;
+ double output;
+
+ output = pow(d_radix,i_power);
+ return ( (unsigned int)cvsd_round(output));
+ }
+
+ int
+ cvsd_decode_bs_impl::work(int noutput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items)
+ {
+ const unsigned char *in = (const unsigned char*)input_items[0];
+ short *out = (short *) output_items[0];
+
+ int i=0;
+ short output_short=0; // 2 bytes 0 .. 65,535
+ unsigned char bit_count=0; // 1 byte, 0 .. 255
+ unsigned int mask=0; // 4 bytes, 0 .. 4,294,967,295
+ unsigned char input_byte=0; // 1 bytes
+ unsigned char input_bit=0; // 1 byte, 0 .. 255
+
+ // Loop through each input data point
+ for(i = 0; i < noutput_items/8.0; i++) {
+ input_byte = in[i];
+ // Initiliaze bit counter
+ bit_count=0;
+
+ while(bit_count<8) {
+ // Compute the Appropriate Mask
+ mask=cvsd_pow(2,7-bit_count);
+
+ // Pull off the corresponding bit
+ input_bit = input_byte & mask;
+
+ // Update the bit counter
+ bit_count++;
+
+ // Update runner with the next input bit
+ // Runner is a shift-register; shift left, add on newest output bit
+ d_runner = (d_runner<<1) | ((unsigned int) input_bit);
+
+ // Run this only if you have >= J bits in your shift register
+ if(d_loop_counter>=d_J) {
+ // Update Step Size
+ d_runner_mask=(cvsd_pow(2,d_J)-1);
+ if((cvsd_bitwise_sum(d_runner & d_runner_mask)>=d_J) ||
+ (cvsd_bitwise_sum((~d_runner) & d_runner_mask)>=d_J)) {
+ // Runs of 1s and 0s
+ d_stepsize = std::min( (short) (d_stepsize + d_min_step), d_max_step);
+ }
+ else {
+ // No runs of 1s and 0s
+ d_stepsize = std::max( (short) cvsd_round(d_stepsize*d_step_decay), d_min_step);
+ }
+ }
+
+ // Update Accum (i.e. the reference value)
+ if(input_bit) {
+ d_accum = d_accum+d_stepsize;
+ }
+ else {
+ d_accum = d_accum-d_stepsize;
+ }
+
+ // Multiply by Accum_Decay
+ d_accum = (cvsd_round(d_accum*d_accum_decay));
+
+ // Check for overflow
+ if(d_accum >=((int) d_pos_accum_max)) {
+ d_accum = (int)d_pos_accum_max;
+ }
+ else if(d_accum <=((int) d_neg_accum_max)) {
+ d_accum = (int)d_neg_accum_max;
+ }
+
+ // Find the output short to write to the file
+ output_short = ((short)d_accum);
+
+ if(d_loop_counter <= d_K) {
+ d_loop_counter++;
+ }
+
+ *(out++) = output_short;
+ } // while ()
+
+ } // for()
+
+ return noutput_items;
+ }
+
+ } /* namespace vocoder */
+} /* namespace gr */
--
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