-/*\r
-* Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>\r
-*\r
-* This file is part of CasparCG (www.casparcg.com).\r
-*\r
-* CasparCG is free software: you can redistribute it and/or modify\r
-* it under the terms of the GNU General Public License as published by\r
-* the Free Software Foundation, either version 3 of the License, or\r
-* (at your option) any later version.\r
-*\r
-* CasparCG is distributed in the hope that it will be useful,\r
-* but WITHOUT ANY WARRANTY; without even the implied warranty of\r
-* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r
-* GNU General Public License for more details.\r
-*\r
-* You should have received a copy of the GNU General Public License\r
-* along with CasparCG. If not, see <http://www.gnu.org/licenses/>.\r
-*\r
-* Author: Robert Nagy, ronag89@gmail.com\r
-*/\r
-\r
-#include "../StdAfx.h"\r
-\r
-#include "frame_consumer.h"\r
-\r
-#include <common/except.h>\r
-\r
-#include <core/video_format.h>\r
-#include <core/frame/data_frame.h>\r
-\r
-#include <common/concurrency/async.h>\r
-\r
-namespace caspar { namespace core {\r
- \r
-std::vector<const consumer_factory_t> g_factories;\r
-\r
-void register_consumer_factory(const consumer_factory_t& factory)\r
-{\r
- g_factories.push_back(factory);\r
-}\r
-\r
-class destroy_consumer_proxy : public frame_consumer\r
-{ \r
- std::shared_ptr<frame_consumer> consumer_;\r
-public:\r
- destroy_consumer_proxy(spl::shared_ptr<frame_consumer>&& consumer) \r
- : consumer_(std::move(consumer))\r
- {\r
- }\r
-\r
- ~destroy_consumer_proxy()\r
- { \r
- static tbb::atomic<int> counter = tbb::atomic<int>();\r
- \r
- ++counter;\r
- CASPAR_VERIFY(counter < 32);\r
- \r
- auto consumer = new std::shared_ptr<frame_consumer>(std::move(consumer_));\r
- async([=]\r
- {\r
- std::unique_ptr<std::shared_ptr<frame_consumer>> pointer_guard(consumer);\r
-\r
- auto str = (*consumer)->print();\r
- try\r
- {\r
- if(!consumer->unique())\r
- CASPAR_LOG(trace) << str << L" Not destroyed on asynchronous destruction thread: " << consumer->use_count();\r
- else\r
- CASPAR_LOG(trace) << str << L" Destroying on asynchronous destruction thread.";\r
- }\r
- catch(...){}\r
-\r
- pointer_guard.reset();\r
-\r
- --counter;\r
- }); \r
- }\r
- \r
- virtual bool send(const spl::shared_ptr<const class data_frame>& frame) override {return consumer_->send(frame);}\r
- virtual void initialize(const struct video_format_desc& format_desc, int channel_index) override {return consumer_->initialize(format_desc, channel_index);}\r
- virtual std::wstring print() const override {return consumer_->print();} \r
- virtual std::wstring name() const override {return consumer_->name();}\r
- virtual boost::property_tree::wptree info() const override {return consumer_->info();}\r
- virtual bool has_synchronization_clock() const override {return consumer_->has_synchronization_clock();}\r
- virtual int buffer_depth() const override {return consumer_->buffer_depth();}\r
- virtual int index() const override {return consumer_->index();}\r
-};\r
-\r
-class print_consumer_proxy : public frame_consumer\r
-{ \r
- std::shared_ptr<frame_consumer> consumer_;\r
-public:\r
- print_consumer_proxy(spl::shared_ptr<frame_consumer>&& consumer) \r
- : consumer_(std::move(consumer))\r
- {\r
- CASPAR_LOG(info) << consumer_->print() << L" Initialized.";\r
- }\r
-\r
- ~print_consumer_proxy()\r
- { \r
- auto str = consumer_->print();\r
- CASPAR_LOG(trace) << str << L" Uninitializing.";\r
- consumer_.reset();\r
- CASPAR_LOG(info) << str << L" Uninitialized.";\r
- }\r
- \r
- virtual bool send(const spl::shared_ptr<const class data_frame>& frame) override {return consumer_->send(frame);}\r
- virtual void initialize(const struct video_format_desc& format_desc, int channel_index) override {return consumer_->initialize(format_desc, channel_index);}\r
- virtual std::wstring print() const override {return consumer_->print();}\r
- virtual std::wstring name() const override {return consumer_->name();}\r
- virtual boost::property_tree::wptree info() const override {return consumer_->info();}\r
- virtual bool has_synchronization_clock() const override {return consumer_->has_synchronization_clock();}\r
- virtual int buffer_depth() const override {return consumer_->buffer_depth();}\r
- virtual int index() const override {return consumer_->index();}\r
-};\r
-\r
-class recover_consumer_proxy : public frame_consumer\r
-{ \r
- std::shared_ptr<frame_consumer> consumer_;\r
- int channel_index_;\r
- video_format_desc format_desc_;\r
-public:\r
- recover_consumer_proxy(spl::shared_ptr<frame_consumer>&& consumer) \r
- : consumer_(std::move(consumer))\r
- {\r
- }\r
- \r
- virtual bool send(const spl::shared_ptr<const class data_frame>& frame) \r
- {\r
- try\r
- {\r
- return consumer_->send(frame);\r
- }\r
- catch(...)\r
- {\r
- CASPAR_LOG_CURRENT_EXCEPTION();\r
- try\r
- {\r
- consumer_->initialize(format_desc_, channel_index_);\r
- return consumer_->send(frame);\r
- }\r
- catch(...)\r
- {\r
- CASPAR_LOG_CURRENT_EXCEPTION();\r
- CASPAR_LOG(error) << print() << "Failed to recover consumer.";\r
- return false;\r
- }\r
- }\r
- }\r
-\r
- virtual void initialize(const struct video_format_desc& format_desc, int channel_index) \r
- {\r
- format_desc_ = format_desc;\r
- channel_index_ = channel_index;\r
- return consumer_->initialize(format_desc, channel_index);\r
- }\r
-\r
- virtual std::wstring print() const override {return consumer_->print();}\r
- virtual std::wstring name() const override {return consumer_->name();}\r
- virtual boost::property_tree::wptree info() const override {return consumer_->info();}\r
- virtual bool has_synchronization_clock() const override {return consumer_->has_synchronization_clock();}\r
- virtual int buffer_depth() const override {return consumer_->buffer_depth();}\r
- virtual int index() const override {return consumer_->index();}\r
-};\r
-\r
-// This class is used to guarantee that audio cadence is correct. This is important for NTSC audio.\r
-class cadence_guard : public frame_consumer\r
-{\r
- spl::shared_ptr<frame_consumer> consumer_;\r
- std::vector<int> audio_cadence_;\r
- boost::circular_buffer<int> sync_buffer_;\r
-public:\r
- cadence_guard(const spl::shared_ptr<frame_consumer>& consumer)\r
- : consumer_(consumer)\r
- {\r
- }\r
- \r
- virtual void initialize(const video_format_desc& format_desc, int channel_index) override\r
- {\r
- audio_cadence_ = format_desc.audio_cadence;\r
- sync_buffer_ = boost::circular_buffer<int>(format_desc.audio_cadence.size());\r
- consumer_->initialize(format_desc, channel_index);\r
- }\r
-\r
- virtual bool send(const spl::shared_ptr<const data_frame>& frame) override\r
- { \r
- if(audio_cadence_.size() == 1)\r
- return consumer_->send(frame);\r
-\r
- bool result = true;\r
- \r
- if(boost::range::equal(sync_buffer_, audio_cadence_) && audio_cadence_.front() == static_cast<int>(frame->audio_data().size())) \r
- { \r
- // Audio sent so far is in sync, now we can send the next chunk.\r
- result = consumer_->send(frame);\r
- boost::range::rotate(audio_cadence_, std::begin(audio_cadence_)+1);\r
- }\r
- else\r
- CASPAR_LOG(trace) << print() << L" Syncing audio.";\r
-\r
- sync_buffer_.push_back(static_cast<int>(frame->audio_data().size()));\r
- \r
- return result;\r
- }\r
- \r
- virtual std::wstring print() const override {return consumer_->print();}\r
- virtual std::wstring name() const override {return consumer_->name();}\r
- virtual boost::property_tree::wptree info() const override {return consumer_->info();}\r
- virtual bool has_synchronization_clock() const override {return consumer_->has_synchronization_clock();}\r
- virtual int buffer_depth() const override {return consumer_->buffer_depth();}\r
- virtual int index() const override {return consumer_->index();}\r
-};\r
-\r
-spl::shared_ptr<core::frame_consumer> create_consumer(const std::vector<std::wstring>& params)\r
-{\r
- if(params.empty())\r
- BOOST_THROW_EXCEPTION(invalid_argument() << arg_name_info("params") << arg_value_info(""));\r
- \r
- auto consumer = frame_consumer::empty();\r
- std::any_of(g_factories.begin(), g_factories.end(), [&](const consumer_factory_t& factory) -> bool\r
- {\r
- try\r
- {\r
- consumer = factory(params);\r
- }\r
- catch(...)\r
- {\r
- CASPAR_LOG_CURRENT_EXCEPTION();\r
- }\r
- return consumer != frame_consumer::empty();\r
- });\r
-\r
- if(consumer == frame_consumer::empty())\r
- BOOST_THROW_EXCEPTION(file_not_found() << msg_info("No match found for supplied commands. Check syntax."));\r
-\r
- return spl::make_shared<destroy_consumer_proxy>(\r
- spl::make_shared<print_consumer_proxy>(\r
- spl::make_shared<recover_consumer_proxy>(\r
- spl::make_shared<cadence_guard>(\r
- std::move(consumer)))));\r
-}\r
-\r
-const spl::shared_ptr<frame_consumer>& frame_consumer::empty()\r
-{\r
- class empty_frame_consumer : public frame_consumer\r
- {\r
- public:\r
- virtual bool send(const spl::shared_ptr<const data_frame>&) override {return false;}\r
- virtual void initialize(const video_format_desc&, int) override{}\r
- virtual std::wstring print() const override {return L"empty";}\r
- virtual std::wstring name() const override {return L"empty";}\r
- virtual bool has_synchronization_clock() const override {return false;}\r
- virtual int buffer_depth() const override {return 0;};\r
- virtual int index() const{return -1;}\r
- virtual boost::property_tree::wptree info() const override\r
- {\r
- boost::property_tree::wptree info;\r
- info.add(L"type", L"empty");\r
- return info;\r
- }\r
- };\r
- static spl::shared_ptr<frame_consumer> consumer = spl::make_shared<empty_frame_consumer>();\r
- return consumer;\r
-}\r
-\r
-}}
\ No newline at end of file
+/*
+* Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
+*
+* This file is part of CasparCG (www.casparcg.com).
+*
+* CasparCG 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.
+*
+* CasparCG 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 CasparCG. If not, see <http://www.gnu.org/licenses/>.
+*
+* Author: Robert Nagy, ronag89@gmail.com
+*/
+
+#include "../StdAfx.h"
+
+#include "frame_consumer.h"
+
+#include <common/except.h>
+#include <common/future.h>
+#include <common/os/general_protection_fault.h>
+
+#include <core/video_format.h>
+#include <core/frame/frame.h>
+#include <core/frame/audio_channel_layout.h>
+
+#include <boost/thread.hpp>
+
+#include <future>
+#include <vector>
+#include <map>
+
+namespace caspar { namespace core {
+
+struct frame_consumer_registry::impl
+{
+ std::vector<consumer_factory_t> consumer_factories;
+ std::map<std::wstring, preconfigured_consumer_factory_t> preconfigured_consumer_factories;
+ spl::shared_ptr<help_repository> help_repo;
+
+ impl(spl::shared_ptr<help_repository> help_repo)
+ : help_repo(std::move(help_repo))
+ {
+ }
+};
+
+frame_consumer_registry::frame_consumer_registry(spl::shared_ptr<help_repository> help_repo)
+ : impl_(new impl(std::move(help_repo)))
+{
+}
+
+void frame_consumer_registry::register_consumer_factory(const std::wstring& name, const consumer_factory_t& factory, const help_item_describer& describer)
+{
+ impl_->consumer_factories.push_back(factory);
+ impl_->help_repo->register_item({ L"consumer" }, std::move(name), describer);
+}
+
+void frame_consumer_registry::register_preconfigured_consumer_factory(
+ const std::wstring& element_name,
+ const preconfigured_consumer_factory_t& factory)
+{
+ impl_->preconfigured_consumer_factories.insert(std::make_pair(element_name, factory));
+}
+
+tbb::atomic<bool>& destroy_consumers_in_separate_thread()
+{
+ static tbb::atomic<bool> state;
+
+ return state;
+}
+
+void destroy_consumers_synchronously()
+{
+ destroy_consumers_in_separate_thread() = false;
+}
+
+class destroy_consumer_proxy : public frame_consumer
+{
+ std::shared_ptr<frame_consumer> consumer_;
+public:
+ destroy_consumer_proxy(spl::shared_ptr<frame_consumer>&& consumer)
+ : consumer_(std::move(consumer))
+ {
+ destroy_consumers_in_separate_thread() = true;
+ }
+
+ ~destroy_consumer_proxy()
+ {
+ static tbb::atomic<int> counter;
+ static std::once_flag counter_init_once;
+ std::call_once(counter_init_once, []{ counter = 0; });
+
+ if (!destroy_consumers_in_separate_thread())
+ return;
+
+ ++counter;
+ CASPAR_VERIFY(counter < 8);
+
+ auto consumer = new std::shared_ptr<frame_consumer>(std::move(consumer_));
+ boost::thread([=]
+ {
+ std::unique_ptr<std::shared_ptr<frame_consumer>> pointer_guard(consumer);
+ auto str = (*consumer)->print();
+
+ try
+ {
+ ensure_gpf_handler_installed_for_thread(u8(L"Destroyer: " + str).c_str());
+
+ if (!consumer->unique())
+ CASPAR_LOG(debug) << str << L" Not destroyed on asynchronous destruction thread: " << consumer->use_count();
+ else
+ CASPAR_LOG(debug) << str << L" Destroying on asynchronous destruction thread.";
+ }
+ catch(...){}
+
+ pointer_guard.reset();
+
+ }).detach();
+ }
+
+ std::future<bool> send(const_frame frame) override {return consumer_->send(std::move(frame));}
+ void initialize(const video_format_desc& format_desc, const audio_channel_layout& channel_layout, int channel_index) override {return consumer_->initialize(format_desc, channel_layout, channel_index);}
+ std::wstring print() const override {return consumer_->print();}
+ std::wstring name() const override {return consumer_->name();}
+ boost::property_tree::wptree info() const override {return consumer_->info();}
+ bool has_synchronization_clock() const override {return consumer_->has_synchronization_clock();}
+ int buffer_depth() const override {return consumer_->buffer_depth();}
+ int index() const override {return consumer_->index();}
+ int64_t presentation_frame_age_millis() const override {return consumer_->presentation_frame_age_millis();}
+ monitor::subject& monitor_output() override {return consumer_->monitor_output();}
+ const frame_consumer* unwrapped() const override {return consumer_->unwrapped();}
+};
+
+class print_consumer_proxy : public frame_consumer
+{
+ std::shared_ptr<frame_consumer> consumer_;
+public:
+ print_consumer_proxy(spl::shared_ptr<frame_consumer>&& consumer)
+ : consumer_(std::move(consumer))
+ {
+ }
+
+ ~print_consumer_proxy()
+ {
+ auto str = consumer_->print();
+ CASPAR_LOG(debug) << str << L" Uninitializing.";
+ consumer_.reset();
+ CASPAR_LOG(info) << str << L" Uninitialized.";
+ }
+
+ std::future<bool> send(const_frame frame) override {return consumer_->send(std::move(frame));}
+ void initialize(const video_format_desc& format_desc, const audio_channel_layout& channel_layout, int channel_index) override
+ {
+ consumer_->initialize(format_desc, channel_layout, channel_index);
+ CASPAR_LOG(info) << consumer_->print() << L" Initialized.";
+ }
+ std::wstring print() const override {return consumer_->print();}
+ std::wstring name() const override {return consumer_->name();}
+ boost::property_tree::wptree info() const override {return consumer_->info();}
+ bool has_synchronization_clock() const override {return consumer_->has_synchronization_clock();}
+ int buffer_depth() const override {return consumer_->buffer_depth();}
+ int index() const override {return consumer_->index();}
+ int64_t presentation_frame_age_millis() const override {return consumer_->presentation_frame_age_millis();}
+ monitor::subject& monitor_output() override {return consumer_->monitor_output();}
+ const frame_consumer* unwrapped() const override {return consumer_->unwrapped();}
+};
+
+class recover_consumer_proxy : public frame_consumer
+{
+ std::shared_ptr<frame_consumer> consumer_;
+ int channel_index_ = -1;
+ video_format_desc format_desc_;
+ audio_channel_layout channel_layout_ = audio_channel_layout::invalid();
+public:
+ recover_consumer_proxy(spl::shared_ptr<frame_consumer>&& consumer)
+ : consumer_(std::move(consumer))
+ {
+ }
+
+ std::future<bool> send(const_frame frame) override
+ {
+ try
+ {
+ return consumer_->send(frame);
+ }
+ catch(...)
+ {
+ CASPAR_LOG_CURRENT_EXCEPTION();
+ try
+ {
+ consumer_->initialize(format_desc_, channel_layout_, channel_index_);
+ return consumer_->send(frame);
+ }
+ catch(...)
+ {
+ CASPAR_LOG_CURRENT_EXCEPTION();
+ CASPAR_LOG(error) << print() << " Failed to recover consumer.";
+ return make_ready_future(false);
+ }
+ }
+ }
+
+ void initialize(const video_format_desc& format_desc, const audio_channel_layout& channel_layout, int channel_index) override
+ {
+ format_desc_ = format_desc;
+ channel_layout_ = channel_layout;
+ channel_index_ = channel_index;
+ return consumer_->initialize(format_desc, channel_layout, channel_index);
+ }
+
+ std::wstring print() const override {return consumer_->print();}
+ std::wstring name() const override {return consumer_->name();}
+ boost::property_tree::wptree info() const override {return consumer_->info();}
+ bool has_synchronization_clock() const override {return consumer_->has_synchronization_clock();}
+ int buffer_depth() const override {return consumer_->buffer_depth();}
+ int index() const override {return consumer_->index();}
+ int64_t presentation_frame_age_millis() const override {return consumer_->presentation_frame_age_millis();}
+ monitor::subject& monitor_output() override {return consumer_->monitor_output();}
+ const frame_consumer* unwrapped() const override {return consumer_->unwrapped();}
+};
+
+// This class is used to guarantee that audio cadence is correct. This is important for NTSC audio.
+class cadence_guard : public frame_consumer
+{
+ spl::shared_ptr<frame_consumer> consumer_;
+ std::vector<int> audio_cadence_;
+ video_format_desc format_desc_;
+ audio_channel_layout channel_layout_ = audio_channel_layout::invalid();
+ boost::circular_buffer<std::size_t> sync_buffer_;
+public:
+ cadence_guard(const spl::shared_ptr<frame_consumer>& consumer)
+ : consumer_(consumer)
+ {
+ }
+
+ void initialize(const video_format_desc& format_desc, const audio_channel_layout& channel_layout, int channel_index) override
+ {
+ audio_cadence_ = format_desc.audio_cadence;
+ sync_buffer_ = boost::circular_buffer<std::size_t>(format_desc.audio_cadence.size());
+ format_desc_ = format_desc;
+ channel_layout_ = channel_layout;
+ consumer_->initialize(format_desc, channel_layout, channel_index);
+ }
+
+ std::future<bool> send(const_frame frame) override
+ {
+ if(audio_cadence_.size() == 1)
+ return consumer_->send(frame);
+
+ std::future<bool> result = make_ready_future(true);
+
+ if(boost::range::equal(sync_buffer_, audio_cadence_) && audio_cadence_.front() * channel_layout_.num_channels == static_cast<int>(frame.audio_data().size()))
+ {
+ // Audio sent so far is in sync, now we can send the next chunk.
+ result = consumer_->send(frame);
+ boost::range::rotate(audio_cadence_, std::begin(audio_cadence_)+1);
+ }
+ else
+ CASPAR_LOG(trace) << print() << L" Syncing audio.";
+
+ sync_buffer_.push_back(static_cast<int>(frame.audio_data().size() / channel_layout_.num_channels));
+
+ return std::move(result);
+ }
+
+ std::wstring print() const override {return consumer_->print();}
+ std::wstring name() const override {return consumer_->name();}
+ boost::property_tree::wptree info() const override {return consumer_->info();}
+ bool has_synchronization_clock() const override {return consumer_->has_synchronization_clock();}
+ int buffer_depth() const override {return consumer_->buffer_depth();}
+ int index() const override {return consumer_->index();}
+ int64_t presentation_frame_age_millis() const override {return consumer_->presentation_frame_age_millis();}
+ monitor::subject& monitor_output() override {return consumer_->monitor_output();}
+ const frame_consumer* unwrapped() const override {return consumer_->unwrapped();}
+};
+
+spl::shared_ptr<core::frame_consumer> frame_consumer_registry::create_consumer(
+ const std::vector<std::wstring>& params, interaction_sink* sink, std::vector<spl::shared_ptr<video_channel>> channels) const
+{
+ if(params.empty())
+ CASPAR_THROW_EXCEPTION(invalid_argument() << msg_info("params cannot be empty"));
+
+ auto consumer = frame_consumer::empty();
+ auto& consumer_factories = impl_->consumer_factories;
+ std::any_of(consumer_factories.begin(), consumer_factories.end(), [&](const consumer_factory_t& factory) -> bool
+ {
+ try
+ {
+ consumer = factory(params, sink, channels);
+ }
+ catch(...)
+ {
+ CASPAR_LOG_CURRENT_EXCEPTION();
+ }
+ return consumer != frame_consumer::empty();
+ });
+
+ if(consumer == frame_consumer::empty())
+ CASPAR_THROW_EXCEPTION(file_not_found() << msg_info("No match found for supplied commands. Check syntax."));
+
+ return spl::make_shared<destroy_consumer_proxy>(
+ spl::make_shared<print_consumer_proxy>(
+ spl::make_shared<recover_consumer_proxy>(
+ spl::make_shared<cadence_guard>(
+ std::move(consumer)))));
+}
+
+spl::shared_ptr<frame_consumer> frame_consumer_registry::create_consumer(
+ const std::wstring& element_name,
+ const boost::property_tree::wptree& element,
+ interaction_sink* sink,
+ std::vector<spl::shared_ptr<video_channel>> channels) const
+{
+ auto& preconfigured_consumer_factories = impl_->preconfigured_consumer_factories;
+ auto found = preconfigured_consumer_factories.find(element_name);
+
+ if (found == preconfigured_consumer_factories.end())
+ CASPAR_THROW_EXCEPTION(user_error()
+ << msg_info(L"No consumer factory registered for element name " + element_name));
+
+ return spl::make_shared<destroy_consumer_proxy>(
+ spl::make_shared<print_consumer_proxy>(
+ spl::make_shared<recover_consumer_proxy>(
+ spl::make_shared<cadence_guard>(
+ found->second(element, sink, channels)))));
+}
+
+const spl::shared_ptr<frame_consumer>& frame_consumer::empty()
+{
+ class empty_frame_consumer : public frame_consumer
+ {
+ public:
+ std::future<bool> send(const_frame) override { return make_ready_future(false); }
+ void initialize(const video_format_desc&, const audio_channel_layout&, int) override{}
+ std::wstring print() const override {return L"empty";}
+ std::wstring name() const override {return L"empty";}
+ bool has_synchronization_clock() const override {return false;}
+ int buffer_depth() const override {return 0;};
+ int index() const override {return -1;}
+ int64_t presentation_frame_age_millis() const override {return -1;}
+ monitor::subject& monitor_output() override {static monitor::subject monitor_subject(""); return monitor_subject;}
+ boost::property_tree::wptree info() const override
+ {
+ boost::property_tree::wptree info;
+ info.add(L"type", L"empty");
+ return info;
+ }
+ };
+ static spl::shared_ptr<frame_consumer> consumer = spl::make_shared<empty_frame_consumer>();
+ return consumer;
+}
+
+}}
projects / casparcg / blobdiff