git.sesse.net Git - casparcg/blob - core/consumer/frame_consumer.cpp

   1 /*
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
   3 *
   4 * This file is part of CasparCG (www.casparcg.com).
   5 *
   6 * CasparCG is free software: you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation, either version 3 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * CasparCG is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
  18 *
  19 * Author: Robert Nagy, ronag89@gmail.com
  20 */
  21
  22 #include "../StdAfx.h"
  23
  24 #include "frame_consumer.h"
  25
  26 #include <common/except.h>
  27 #include <common/future.h>
  28
  29 #include <core/video_format.h>
  30 #include <core/frame/frame.h>
  31
  32 #include <boost/thread.hpp>
  33
  34 #include <future>
  35 #include <vector>
  36 #include <map>
  37
  38 namespace caspar { namespace core {
  39
  40 struct frame_consumer_registry::impl
  41 {
  42         std::vector<consumer_factory_t>                                                         consumer_factories;
  43         std::map<std::wstring, preconfigured_consumer_factory_t>        preconfigured_consumer_factories;
  44         spl::shared_ptr<help_repository>                                                        help_repo;
  45
  46         impl(spl::shared_ptr<help_repository> help_repo)
  47                 : help_repo(std::move(help_repo))
  48         {
  49         }
  50 };
  51
  52 frame_consumer_registry::frame_consumer_registry(spl::shared_ptr<help_repository> help_repo)
  53         : impl_(new impl(std::move(help_repo)))
  54 {
  55 }
  56
  57 void frame_consumer_registry::register_consumer_factory(const std::wstring& name, const consumer_factory_t& factory, const help_item_describer& describer)
  58 {
  59         impl_->consumer_factories.push_back(factory);
  60         impl_->help_repo->register_item({ L"consumer" }, std::move(name), describer);
  61 }
  62
  63 void frame_consumer_registry::register_preconfigured_consumer_factory(
  64                 const std::wstring& element_name,
  65                 const preconfigured_consumer_factory_t& factory)
  66 {
  67         impl_->preconfigured_consumer_factories.insert(std::make_pair(element_name, factory));
  68 }
  69
  70 class destroy_consumer_proxy : public frame_consumer
  71 {
  72         std::shared_ptr<frame_consumer> consumer_;
  73 public:
  74         destroy_consumer_proxy(spl::shared_ptr<frame_consumer>&& consumer)
  75                 : consumer_(std::move(consumer))
  76         {
  77         }
  78
  79         ~destroy_consumer_proxy()
  80         {
  81                 static tbb::atomic<int> counter;
  82                 static std::once_flag counter_init_once;
  83                 std::call_once(counter_init_once, []{ counter = 0; });
  84
  85                 ++counter;
  86                 CASPAR_VERIFY(counter < 8);
  87
  88                 auto consumer = new std::shared_ptr<frame_consumer>(std::move(consumer_));
  89                 boost::thread([=]
  90                 {
  91                         std::unique_ptr<std::shared_ptr<frame_consumer>> pointer_guard(consumer);
  92
  93                         auto str = (*consumer)->print();
  94                         try
  95                         {
  96                                 if(!consumer->unique())
  97                                         CASPAR_LOG(trace) << str << L" Not destroyed on asynchronous destruction thread: " << consumer->use_count();
  98                                 else
  99                                         CASPAR_LOG(trace) << str << L" Destroying on asynchronous destruction thread.";
 100                         }
 101                         catch(...){}
 102
 103                         pointer_guard.reset();
 104
 105                 }).detach();
 106         }
 107
 108         std::future<bool> send(const_frame frame) override                                                                                                      {return consumer_->send(std::move(frame));}
 109         virtual void initialize(const video_format_desc& format_desc, int channel_index)        override        {return consumer_->initialize(format_desc, channel_index);}
 110         std::wstring print() const override                                                                                                                                     {return consumer_->print();}
 111         std::wstring name() const override                                                                                                                                      {return consumer_->name();}
 112         boost::property_tree::wptree info() const override                                                                                                      {return consumer_->info();}
 113         bool has_synchronization_clock() const override                                                                                                         {return consumer_->has_synchronization_clock();}
 114         int buffer_depth() const override                                                                                                                                       {return consumer_->buffer_depth();}
 115         int index() const override                                                                                                                                                      {return consumer_->index();}
 116         monitor::subject& monitor_output() override                                                                                                                     {return consumer_->monitor_output();}
 117 };
 118
 119 class print_consumer_proxy : public frame_consumer
 120 {
 121         std::shared_ptr<frame_consumer> consumer_;
 122 public:
 123         print_consumer_proxy(spl::shared_ptr<frame_consumer>&& consumer)
 124                 : consumer_(std::move(consumer))
 125         {
 126                 CASPAR_LOG(info) << consumer_->print() << L" Initialized.";
 127         }
 128
 129         ~print_consumer_proxy()
 130         {
 131                 auto str = consumer_->print();
 132                 CASPAR_LOG(trace) << str << L" Uninitializing.";
 133                 consumer_.reset();
 134                 CASPAR_LOG(info) << str << L" Uninitialized.";
 135         }
 136
 137         std::future<bool> send(const_frame frame) override                                                                                                      {return consumer_->send(std::move(frame));}
 138         virtual void initialize(const video_format_desc& format_desc, int channel_index)        override        {return consumer_->initialize(format_desc, channel_index);}
 139         std::wstring print() const override                                                                                                                                     {return consumer_->print();}
 140         std::wstring name() const override                                                                                                                                      {return consumer_->name();}
 141         boost::property_tree::wptree info() const override                                                                                                      {return consumer_->info();}
 142         bool has_synchronization_clock() const override                                                                                                         {return consumer_->has_synchronization_clock();}
 143         int buffer_depth() const override                                                                                                                                       {return consumer_->buffer_depth();}
 144         int index() const override                                                                                                                                                      {return consumer_->index();}
 145         monitor::subject& monitor_output() override                                                                                                                     {return consumer_->monitor_output();}
 146 };
 147
 148 class recover_consumer_proxy : public frame_consumer
 149 {
 150         std::shared_ptr<frame_consumer> consumer_;
 151         int                                                             channel_index_  = -1;
 152         video_format_desc                               format_desc_;
 153 public:
 154         recover_consumer_proxy(spl::shared_ptr<frame_consumer>&& consumer)
 155                 : consumer_(std::move(consumer))
 156         {
 157         }
 158
 159         virtual std::future<bool> send(const_frame frame)
 160         {
 161                 try
 162                 {
 163                         return consumer_->send(frame);
 164                 }
 165                 catch(...)
 166                 {
 167                         CASPAR_LOG_CURRENT_EXCEPTION();
 168                         try
 169                         {
 170                                 consumer_->initialize(format_desc_, channel_index_);
 171                                 return consumer_->send(frame);
 172                         }
 173                         catch(...)
 174                         {
 175                                 CASPAR_LOG_CURRENT_EXCEPTION();
 176                                 CASPAR_LOG(error) << print() << " Failed to recover consumer.";
 177                                 return make_ready_future(false);
 178                         }
 179                 }
 180         }
 181
 182         virtual void initialize(const video_format_desc& format_desc, int channel_index)
 183         {
 184                 format_desc_    = format_desc;
 185                 channel_index_  = channel_index;
 186                 return consumer_->initialize(format_desc, channel_index);
 187         }
 188
 189         std::wstring print() const override                                                                             {return consumer_->print();}
 190         std::wstring name() const override                                                                              {return consumer_->name();}
 191         boost::property_tree::wptree info() const override                                              {return consumer_->info();}
 192         bool has_synchronization_clock() const override                                                 {return consumer_->has_synchronization_clock();}
 193         int buffer_depth() const override                                                                               {return consumer_->buffer_depth();}
 194         int index() const override                                                                                              {return consumer_->index();}
 195         monitor::subject& monitor_output() override                                                             {return consumer_->monitor_output();}
 196 };
 197
 198 // This class is used to guarantee that audio cadence is correct. This is important for NTSC audio.
 199 class cadence_guard : public frame_consumer
 200 {
 201         spl::shared_ptr<frame_consumer>         consumer_;
 202         std::vector<int>                                        audio_cadence_;
 203         video_format_desc                                       format_desc_;
 204         boost::circular_buffer<std::size_t>     sync_buffer_;
 205 public:
 206         cadence_guard(const spl::shared_ptr<frame_consumer>& consumer)
 207                 : consumer_(consumer)
 208         {
 209         }
 210
 211         void initialize(const video_format_desc& format_desc, int channel_index) override
 212         {
 213                 audio_cadence_  = format_desc.audio_cadence;
 214                 sync_buffer_    = boost::circular_buffer<std::size_t>(format_desc.audio_cadence.size());
 215                 format_desc_    = format_desc;
 216                 consumer_->initialize(format_desc, channel_index);
 217         }
 218
 219         std::future<bool> send(const_frame frame) override
 220         {
 221                 if(audio_cadence_.size() == 1)
 222                         return consumer_->send(frame);
 223
 224                 std::future<bool> result = make_ready_future(true);
 225
 226                 if(boost::range::equal(sync_buffer_, audio_cadence_) && audio_cadence_.front() * format_desc_.audio_channels == static_cast<int>(frame.audio_data().size()))
 227                 {
 228                         // Audio sent so far is in sync, now we can send the next chunk.
 229                         result = consumer_->send(frame);
 230                         boost::range::rotate(audio_cadence_, std::begin(audio_cadence_)+1);
 231                 }
 232                 else
 233                         CASPAR_LOG(trace) << print() << L" Syncing audio.";
 234
 235                 sync_buffer_.push_back(static_cast<int>(frame.audio_data().size() / format_desc_.audio_channels));
 236
 237                 return std::move(result);
 238         }
 239
 240         std::wstring print() const override                                                                             {return consumer_->print();}
 241         std::wstring name() const override                                                                              {return consumer_->name();}
 242         boost::property_tree::wptree info() const override                                              {return consumer_->info();}
 243         bool has_synchronization_clock() const override                                                 {return consumer_->has_synchronization_clock();}
 244         int buffer_depth() const override                                                                               {return consumer_->buffer_depth();}
 245         int index() const override                                                                                              {return consumer_->index();}
 246         monitor::subject& monitor_output() override                                                             {return consumer_->monitor_output();}
 247 };
 248
 249 spl::shared_ptr<core::frame_consumer> frame_consumer_registry::create_consumer(
 250                 const std::vector<std::wstring>& params, interaction_sink* sink) const
 251 {
 252         if(params.empty())
 253                 CASPAR_THROW_EXCEPTION(invalid_argument() << arg_name_info("params") << arg_value_info(""));
 254
 255         auto consumer = frame_consumer::empty();
 256         auto& consumer_factories = impl_->consumer_factories;
 257         std::any_of(consumer_factories.begin(), consumer_factories.end(), [&](const consumer_factory_t& factory) -> bool
 258                 {
 259                         try
 260                         {
 261                                 consumer = factory(params, sink);
 262                         }
 263                         catch(...)
 264                         {
 265                                 CASPAR_LOG_CURRENT_EXCEPTION();
 266                         }
 267                         return consumer != frame_consumer::empty();
 268                 });
 269
 270         if(consumer == frame_consumer::empty())
 271                 CASPAR_THROW_EXCEPTION(file_not_found() << msg_info("No match found for supplied commands. Check syntax."));
 272
 273         return spl::make_shared<destroy_consumer_proxy>(
 274                         spl::make_shared<print_consumer_proxy>(
 275                          spl::make_shared<recover_consumer_proxy>(
 276                           spl::make_shared<cadence_guard>(
 277                            std::move(consumer)))));
 278 }
 279
 280 spl::shared_ptr<frame_consumer> frame_consumer_registry::create_consumer(
 281                 const std::wstring& element_name,
 282                 const boost::property_tree::wptree& element,
 283                 interaction_sink* sink) const
 284 {
 285         auto& preconfigured_consumer_factories = impl_->preconfigured_consumer_factories;
 286         auto found = preconfigured_consumer_factories.find(element_name);
 287
 288         if (found == preconfigured_consumer_factories.end())
 289                 CASPAR_THROW_EXCEPTION(file_not_found()
 290                         << msg_info(L"No consumer factory registered for element name " + element_name));
 291
 292         return spl::make_shared<destroy_consumer_proxy>(
 293                         spl::make_shared<print_consumer_proxy>(
 294                                         spl::make_shared<recover_consumer_proxy>(
 295                                                         spl::make_shared<cadence_guard>(
 296                                                                         found->second(element, sink)))));
 297 }
 298
 299 const spl::shared_ptr<frame_consumer>& frame_consumer::empty()
 300 {
 301         class empty_frame_consumer : public frame_consumer
 302         {
 303         public:
 304                 std::future<bool> send(const_frame) override { return make_ready_future(false); }
 305                 void initialize(const video_format_desc&, int) override{}
 306                 std::wstring print() const override {return L"empty";}
 307                 std::wstring name() const override {return L"empty";}
 308                 bool has_synchronization_clock() const override {return false;}
 309                 int buffer_depth() const override {return 0;};
 310                 virtual int index() const{return -1;}
 311                 monitor::subject& monitor_output() override {static monitor::subject monitor_subject(""); return monitor_subject;}
 312                 boost::property_tree::wptree info() const override
 313                 {
 314                         boost::property_tree::wptree info;
 315                         info.add(L"type", L"empty");
 316                         return info;
 317                 }
 318         };
 319         static spl::shared_ptr<frame_consumer> consumer = spl::make_shared<empty_frame_consumer>();
 320         return consumer;
 321 }
 322
 323 }}