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/*
Copyright (C) 2009 Her Majesty the Queen in Right of Canada (Communications
Research Center Canada)
*/
/*
This file is part of CRC-DabMux.
CRC-DabMux 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 of the
License, or (at your option) any later version.
CRC-DabMux 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 CRC-DabMux. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dabInputPrbs.h"
#include <string.h>
#include <limits.h>
#include <stdlib.h>
#ifdef HAVE_FORMAT_RAW
# ifdef HAVE_INPUT_PRBS
struct dabInputOperations dabInputPrbsOperations = {
dabInputPrbsInit,
dabInputPrbsOpen,
NULL,
dabInputPrbsRead,
NULL,
NULL,
dabInputPrbsReadFrame,
dabInputPrbsBitrate,
dabInputPrbsClose,
dabInputPrbsClean,
dabInputPrbsRewind,
};
int dabInputPrbsInit(void** args)
{
prbs_data* data = new prbs_data;
memset(data, 0, sizeof(*data));
*args = data;
return 0;
}
int dabInputPrbsOpen(void* args, const char* name)
{
prbs_data* data = (prbs_data*)args;
if (*name != ':') {
etiLog.print(TcpLog::ERR,
"Sorry, PRBS address format is prbs://:polynomial.\n");
errno = EINVAL;
return -1;
}
long polynomial = strtol(++name, (char **)NULL, 10);
if ((polynomial == LONG_MIN) || (polynomial == LONG_MAX)) {
etiLog.print(TcpLog::ERR, "can't convert polynomial number %s\n", name);
errno = EINVAL;
return -1;
}
if (polynomial == 0) {
etiLog.print(TcpLog::ERR, "you must specify a polynomial number\n");
errno = EINVAL;
return -1;
}
data->polynomial = polynomial;
data->accum = 0;
gen_prbs_table(data);
gen_weight_table(data);
dabInputPrbsRewind(args);
return 0;
}
int dabInputPrbsRead(void* args, void* buffer, int size)
{
prbs_data* data = (prbs_data*)args;
unsigned char* cbuffer = reinterpret_cast<unsigned char*>(buffer);
for(int i = 0; i < size; ++i) {
data->accum = update_prbs(args);
*(cbuffer++) = (unsigned char)(data->accum & 0xff);
}
return size;
}
int dabInputPrbsReadFrame(dabInputOperations* ops, void* args,
void* buffer, int size)
{
return ops->read(args, buffer, size);
}
int dabInputPrbsBitrate(dabInputOperations* ops, void* args, int bitrate)
{
return bitrate;
}
int dabInputPrbsClose(void* args)
{
return 0;
}
int dabInputPrbsClean(void** args)
{
delete (prbs_data*)(*args);
return 0;
}
int dabInputPrbsRewind(void* args)
{
prbs_data* data = (prbs_data*)args;
while (data->accum < data->polynomial) {
data->accum <<= 1;
data->accum |= 1;
}
return 0;
}
# endif
#endif
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