2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>
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4 * This file is part of CasparCG.
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6 * CasparCG is free software: you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation, either version 3 of the License, or
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9 * (at your option) any later version.
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11 * CasparCG is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 * GNU General Public License for more details.
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16 * You should have received a copy of the GNU General Public License
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17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
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22 #include <common/memory/safe_ptr.h>
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24 #include <boost/noncopyable.hpp>
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26 #include <algorithm>
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27 #include <functional>
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40 struct frame_factory;
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42 struct frame_producer : boost::noncopyable
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51 virtual ~frame_producer(){}
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53 virtual std::wstring print() const = 0; // nothrow
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55 virtual std::wstring param(const std::wstring&){return L"";}
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57 virtual safe_ptr<frame_producer> get_following_producer() const {return frame_producer::empty();} // nothrow
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58 virtual void set_leading_producer(const safe_ptr<frame_producer>&) {} // nothrow
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60 virtual int64_t nb_frames() const {return std::numeric_limits<int>::max();}
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62 virtual safe_ptr<basic_frame> receive(int hints) = 0;
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63 virtual safe_ptr<core::basic_frame> last_frame() const = 0;
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65 static const safe_ptr<frame_producer>& empty(); // nothrow
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68 safe_ptr<basic_frame> receive_and_follow(safe_ptr<frame_producer>& producer, int hints);
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70 typedef std::function<safe_ptr<core::frame_producer>(const safe_ptr<frame_factory>&, const std::vector<std::wstring>&)> producer_factory_t;
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71 void register_producer_factory(const producer_factory_t& factory); // Not thread-safe.
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72 safe_ptr<core::frame_producer> create_producer(const safe_ptr<frame_factory>&, const std::vector<std::wstring>& params);
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73 safe_ptr<core::frame_producer> create_destroy_proxy(safe_ptr<core::frame_producer>&& producer);
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75 template<typename T>
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76 typename std::decay<T>::type get_param(const std::wstring& name, const std::vector<std::wstring>& params, T fail_value)
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78 auto it = std::find(params.begin(), params.end(), name);
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79 if(it == params.end() || ++it == params.end())
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82 T value = fail_value;
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85 value = boost::lexical_cast<std::decay<T>::type>(*it);
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87 catch(boost::bad_lexical_cast&){}
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