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Diffstat (limited to 'host/lib/gain_handler.cpp')
| -rw-r--r-- | host/lib/gain_handler.cpp | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/host/lib/gain_handler.cpp b/host/lib/gain_handler.cpp new file mode 100644 index 000000000..36e2e8ed3 --- /dev/null +++ b/host/lib/gain_handler.cpp @@ -0,0 +1,177 @@ +// +// 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/utils/gain_handler.hpp> +#include <uhd/utils/assert.hpp> +#include <uhd/types/ranges.hpp> +#include <uhd/utils/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; +} |