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 "../producer/frame/basic_frame.h"
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25 #include "../producer/frame/frame_factory.h"
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27 #include <boost/noncopyable.hpp>
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29 #include <functional>
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32 namespace caspar { namespace core {
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34 class frame_producer : boost::noncopyable
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37 virtual ~frame_producer(){}
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39 virtual safe_ptr<basic_frame> receive() = 0;
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40 virtual std::wstring print() const = 0; // nothrow
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42 virtual void param(const std::wstring&){}
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44 virtual safe_ptr<frame_producer> get_following_producer() const {return frame_producer::empty();} // nothrow
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45 virtual void set_leading_producer(const safe_ptr<frame_producer>& /*producer*/) {} // nothrow
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47 static const safe_ptr<frame_producer>& empty() // nothrow
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49 struct empty_frame_producer : public frame_producer
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51 virtual safe_ptr<basic_frame> receive(){return basic_frame::empty();}
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52 virtual void set_frame_factory(const safe_ptr<frame_factory>&){}
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53 virtual std::wstring print() const { return L"empty";}
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55 static safe_ptr<frame_producer> producer = make_safe<empty_frame_producer>();
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60 safe_ptr<basic_frame> receive_and_follow(safe_ptr<frame_producer>& producer);
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62 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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63 void register_producer_factory(const producer_factory_t& factory); // Not thread-safe.
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64 safe_ptr<core::frame_producer> create_producer(const safe_ptr<frame_factory>&, const std::vector<std::wstring>& params);
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