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/* -*- c++ -*- */
/*
* Copyright 2006 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 <decoder.h>
#include <iostream>
#define DO_PRINT_DEBUG 0
/*
* decode a certain number of output bits
*
* the 'in_buf' and 'out_buf' must have enough memory to handle the
* number of input items and output bits; no error checking is done!
*
* n_bits_to_output: the number of bits per output stream to decode.
*
* returns the actual number of items used per input stream.
*/
size_t
decoder::decode
(const code_input_ptr in_buf,
code_output_ptr out_buf,
size_t n_bits_to_output)
{
if (in_buf == 0) {
std::cerr << "decoder::decode: Error: input buffer is NULL.\n";
assert (0);
}
if (out_buf == 0) {
std::cerr << "decoder::decode: Error: output buffer is NULL.\n";
assert (0);
}
if (n_bits_to_output == 0) {
std::cerr << "decoder::decode: Warning: no output bits requested.\n";
return (0);
}
// set the class-internal number of input metrics
// and output bits left to decode
d_in_buf = in_buf;
d_out_buf = out_buf;
// check that there are enough output buffer items
if (d_out_buf->n_items_left() < n_bits_to_output) {
std::cerr << "encoder::encode: Warning: output buffer size (" <<
d_out_buf->n_items_left() << "is less than the desired number "
"of output items (" << n_bits_to_output <<
") ... using lower number.\n";
n_bits_to_output = d_out_buf->n_items_left();
}
// check that there are enough input buffer items
size_t n_items_to_input = compute_n_input_items (n_bits_to_output);
if (d_in_buf->n_items_left() < n_items_to_input) {
std::cerr << "encoder::encode: Warning: input buffer size (" <<
d_in_buf->n_items_left() << "is less than the computed number "
"of required input items (" << n_items_to_input <<
") ... using lower number.\n";
n_items_to_input = d_in_buf->n_items_left();
n_bits_to_output = compute_n_output_bits (n_items_to_input);
}
if (DO_PRINT_DEBUG) {
std::cout <<
"# output bits = " << n_bits_to_output << "\n"
"# input items = " << n_items_to_input << "\n";
}
// call the private decode function
decode_private ();
if (DO_PRINT_DEBUG) {
std::cout <<
"# input items used = " << d_in_buf->n_items_used() << "\n"
"# output bits used = " << d_out_buf->n_items_used() << "\n";
}
size_t n_items_used = d_in_buf->n_items_used ();
// clear these buffers, just in case
d_in_buf = 0;
d_out_buf = 0;
// return the actual number of input bits used
return (n_items_used);
}
/*
* decode a certain number of input metrics
*
* the 'in_buf' and 'out_buf' must have enough memory to handle the
* number of input items and output bits; no error checking is done!
*
* n_items_to_input: the number of items per input stream to decode
*
* returns the actual number of bits written per output stream
*/
size_t
decoder::decode
(const code_input_ptr in_buf,
size_t n_items_to_input,
code_output_ptr out_buf)
{
if (in_buf == 0) {
std::cerr << "encoder::encode: Error: input buffer is NULL.\n";
assert (0);
}
if (out_buf == 0) {
std::cerr << "encoder::encode: Error: output buffer is NULL.\n";
assert (0);
}
if (n_items_to_input == 0) {
std::cerr << "encoder::encode: Warning: no input items requested.\n";
return (0);
}
// set the class-internal number of input metrics and
// output bits left to decode
d_in_buf = in_buf;
d_out_buf = out_buf;
// check that there are enough input buffer items
if (d_in_buf->n_items_left() < n_items_to_input) {
std::cerr << "encoder::encode: Warning: input buffer size (" <<
d_in_buf->n_items_left() << "is less than the desired number "
"of input items (" << n_items_to_input <<
") ... using lower number.\n";
n_items_to_input = d_in_buf->n_items_left();
}
// check that there are enough output buffer items
size_t n_bits_to_output = compute_n_output_bits (n_items_to_input);
if (d_out_buf->n_items_left() < n_bits_to_output) {
std::cerr << "encoder::encode: Warning: output buffer size (" <<
d_out_buf->n_items_left() << "is less than the computed number "
"of required output items (" << n_bits_to_output <<
") ... using lower number.\n";
n_bits_to_output = d_out_buf->n_items_left();
n_items_to_input = compute_n_input_items (n_bits_to_output);
}
if (DO_PRINT_DEBUG) {
std::cout <<
"# output bits = " << n_bits_to_output << "\n"
"# input items = " << n_items_to_input << "\n";
}
// call the private decode function
decode_private ();
if (DO_PRINT_DEBUG) {
std::cout <<
"# input items used = " << d_in_buf->n_items_used() << "\n"
"# output bits used = " << d_out_buf->n_items_used() << "\n";
}
size_t n_items_used = d_out_buf->n_items_used();
// clear these buffers, just in case
d_in_buf = 0;
d_out_buf = 0;
// return the actual number of output bits written
return (n_items_used);
}
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