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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., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <encoder.h>
#include <iostream>
#define DO_PRINT_DEBUG 0
/*
* encode a certain number of output bits
*
* the 'in_buf' and 'out_buf' must have enough memory to handle the
* number of input and output bits; no error checking is done!
*
* n_bits_to_output: the number of bits per output stream to encode
*
* returns the actual number of bits used per input stream
*/
size_t
encoder::encode
(const code_input_ptr in_buf,
code_output_ptr out_buf,
size_t n_bits_to_output)
{
if (in_buf == 0) {
std::cerr << "encoder::encode{output}: Error: "
"input buffer is NULL.\n";
assert (0);
}
if (out_buf == 0) {
std::cerr << "encoder::encode{output}: Error: "
"output buffer is NULL.\n";
assert (0);
}
if (n_bits_to_output == 0) {
std::cerr << "encoder::encode{output}: Warning: "
"no output bits requested.\n";
return (0);
}
// set the class-internal number of input bits and
// output bits left to encode
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{output}: 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_bits_to_input = compute_n_input_bits (n_bits_to_output);
if (d_in_buf->n_items_left() < n_bits_to_input) {
std::cerr << "encoder::encode{output}: Warning: input buffer size (" <<
d_in_buf->n_items_left() << ") is less than the computed number "
"of required input items (" << n_bits_to_input <<
") ... using lower number.\n";
n_bits_to_input = d_in_buf->n_items_left();
n_bits_to_output = compute_n_output_bits (n_bits_to_input);
}
// set the correct number of I/O bits
d_n_bits_to_input = n_bits_to_input;
d_n_bits_to_output = n_bits_to_output;
if (DO_PRINT_DEBUG) {
std::cout <<
"Before Encoding{output}:\n"
" # output bits = " << d_n_bits_to_output << "\n"
" # input bits = " << d_n_bits_to_input << "\n"
" # output bits used = " << d_out_buf->n_items_used() << "\n"
" # input bits used = " << d_in_buf->n_items_used() << "\n";
}
// call the private encode function
encode_private ();
if (DO_PRINT_DEBUG) {
std::cout <<
"After Encoding{output}:\n"
" # output bits = " << d_n_bits_to_output << "\n"
" # input bits = " << d_n_bits_to_input << "\n"
" # output bits used = " << d_out_buf->n_items_used() << "\n"
" # input bits used = " << d_in_buf->n_items_used() << "\n";
}
// clear these buffers, just in case
d_in_buf = 0;
d_out_buf = 0;
// return the actual number of input bits used
return (n_bits_to_input - d_n_bits_to_input);
}
/*
* encode a certain number of input bits
*
* the 'in_buf' and 'out_buf' must have enough memory to handle the
* number of input and output bits; no error checking is done!
*
* n_bits_to_input: the number of bits per input stream to encode
*
* returns the actual number of bits written per output stream
*/
size_t
encoder::encode
(const code_input_ptr in_buf,
size_t n_bits_to_input,
code_output_ptr out_buf)
{
if (in_buf == 0) {
std::cerr << "encoder::encode{input}: Error: input buffer is NULL.\n";
assert (0);
}
if (out_buf == 0) {
std::cerr << "encoder::encode{input}: Error: output buffer is NULL.\n";
assert (0);
}
if (n_bits_to_input == 0) {
std::cerr << "encoder::encode{input}: Warning: no input bits requested.\n";
return (0);
}
// set the class-internal number of input and
// output bits left to encode
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_bits_to_input) {
std::cerr << "encoder::encode{input}: Warning: input buffer size (" <<
d_in_buf->n_items_left() << ") is less than the desired number "
"of input items (" << n_bits_to_input <<
") ... using lower number.\n";
n_bits_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_bits_to_input);
if (d_out_buf->n_items_left() < n_bits_to_output) {
std::cerr << "encoder::encode{input}: 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_bits_to_input = compute_n_input_bits (n_bits_to_output);
}
// set the correct number of I/O bits
d_n_bits_to_input = n_bits_to_input;
d_n_bits_to_output = n_bits_to_output;
if (DO_PRINT_DEBUG) {
std::cout <<
"Before Encoding{input}:\n"
" # output bits = " << d_n_bits_to_output << "\n"
" # input bits = " << d_n_bits_to_input << "\n"
" # output bits used = " << d_out_buf->n_items_used() << "\n"
" # input bits used = " << d_in_buf->n_items_used() << "\n";
}
// call the private encode function
encode_private ();
if (DO_PRINT_DEBUG) {
std::cout <<
"After Encoding{input}:\n"
" # output bits = " << d_n_bits_to_output << "\n"
" # input bits = " << d_n_bits_to_input << "\n"
" # output bits used = " << d_out_buf->n_items_used() << "\n"
" # input bits used = " << d_in_buf->n_items_used() << "\n";
}
// clear these buffers, just in case
d_in_buf = 0;
d_out_buf = 0;
// return the actual number of output bits written
return (n_bits_to_output - d_n_bits_to_output);
}
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