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//
// Copyright 2010 Ettus Research LLC
//
// This program 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.
//
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <uhd/gain_handler.hpp>
#include <uhd/utils/assert.hpp>
#include <uhd/types/ranges.hpp>
#include <uhd/props.hpp>
#include <boost/assign/list_of.hpp>
#include <boost/foreach.hpp>
#include <boost/format.hpp>
#include <cmath>
#include <vector>
using namespace uhd;
/***********************************************************************
* gain handler implementation interface
**********************************************************************/
class gain_handler_impl : public gain_handler{
public:
gain_handler_impl(
const wax::obj &link,
const props_t &props,
is_equal_t is_equal
);
~gain_handler_impl(void);
bool intercept_get(const wax::obj &key, wax::obj &val);
bool intercept_set(const wax::obj &key, const wax::obj &val);
private:
wax::obj _link;
props_t _props;
is_equal_t _is_equal;
prop_names_t get_gain_names(void);
float get_overall_gain_val(void);
gain_range_t get_overall_gain_range(void);
template <class T> T get_named_prop(const wax::obj &prop, const std::string &name){
return _link[named_prop_t(prop, name)].as<T>();
}
};
/***********************************************************************
* the make function
**********************************************************************/
gain_handler::sptr gain_handler::make(
const wax::obj &link,
const props_t &props,
is_equal_t is_equal
){
return sptr(new gain_handler_impl(link, props, is_equal));
}
/***********************************************************************
* gain handler implementation methods
**********************************************************************/
gain_handler::props_t::props_t(void){
/* NOP */
}
gain_handler_impl::gain_handler_impl(
const wax::obj &link,
const props_t &props,
is_equal_t is_equal
){
_link = link;
_props = props;
_is_equal = is_equal;
}
gain_handler_impl::~gain_handler_impl(void){
/* NOP */
}
prop_names_t gain_handler_impl::get_gain_names(void){
return _link[_props.names].as<prop_names_t>();
}
float gain_handler_impl::get_overall_gain_val(void){
float gain_val = 0;
BOOST_FOREACH(std::string name, get_gain_names()){
gain_val += get_named_prop<float>(_props.value, name);
}
return gain_val;
}
gain_range_t gain_handler_impl::get_overall_gain_range(void){
float gain_min = 0, gain_max = 0, gain_step = 0;
BOOST_FOREACH(std::string name, get_gain_names()){
gain_range_t floatmp = get_named_prop<gain_range_t>(_props.range, name);
gain_min += floatmp.min;
gain_max += floatmp.max;
gain_step = std::max(gain_step, floatmp.step);
}
return gain_range_t(gain_min, gain_max, gain_step);
}
/***********************************************************************
* gain handler implementation get method
**********************************************************************/
bool gain_handler_impl::intercept_get(const wax::obj &key_, wax::obj &val){
wax::obj key; std::string name;
boost::tie(key, name) = extract_named_prop(key_);
//not a wildcard... dont handle (but check name)
if (name != ""){
assert_has(get_gain_names(), name, "gain name");
return false;
}
if (_is_equal(key, _props.value)){
val = get_overall_gain_val();
return true;
}
if (_is_equal(key, _props.range)){
val = get_overall_gain_range();
return true;
}
return false; //not handled
}
/***********************************************************************
* gain handler implementation set method
**********************************************************************/
bool gain_handler_impl::intercept_set(const wax::obj &key_, const wax::obj &val){
wax::obj key; std::string name;
boost::tie(key, name) = extract_named_prop(key_);
//not a gain value key... dont handle
if (not _is_equal(key, _props.value)) return false;
float gain_val = val.as<float>();
//not a wildcard... dont handle (but check name and range)
if (name != ""){
assert_has(get_gain_names(), name, "gain name");
gain_range_t gain = get_named_prop<gain_range_t>(_props.range, name);
if (gain_val > gain.max or gain_val < gain.min) throw std::range_error(str(
boost::format("A value of %f for gain %s is out of range of (%f, %f)")
% gain_val % name % gain.min % gain.max
));
return false;
}
//set the overall gain
BOOST_FOREACH(std::string name, get_gain_names()){
//get the min, max, step for this gain name
gain_range_t gain = get_named_prop<gain_range_t>(_props.range, name);
//clip g to be within the allowed range
float g = std::min(std::max(gain_val, gain.min), gain.max);
//set g to be a multiple of the step size
g -= std::fmod(g, gain.step);
//set g to be the new gain
_link[named_prop_t(_props.value, name)] = g;
//subtract g out of the total gain left to apply
gain_val -= g;
}
return true;
}
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