git.sesse.net Git - casparcg/blob - modules/oal/consumer/oal_consumer.cpp

   1 /*\r
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 * This file is part of CasparCG (www.casparcg.com).\r
   5 *\r
   6 * CasparCG is free software: you can redistribute it and/or modify\r
   7 * it under the terms of the GNU General Public License as published by\r
   8 * the Free Software Foundation, either version 3 of the License, or\r
   9 * (at your option) any later version.\r
  10 *\r
  11 * CasparCG is distributed in the hope that it will be useful,\r
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14 * GNU General Public License for more details.\r
  15 *\r
  16 * You should have received a copy of the GNU General Public License\r
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.\r
  18 *\r
  19 * Author: Robert Nagy, ronag89@gmail.com\r
  20 */\r
  21 \r
  22 #include "oal_consumer.h"\r
  23 \r
  24 #include <common/except.h>\r
  25 #include <common/executor.h>\r
  26 #include <common/diagnostics/graph.h>\r
  27 #include <common/log.h>\r
  28 #include <common/utf.h>\r
  29 #include <common/env.h>\r
  30 \r
  31 #include <core/consumer/frame_consumer.h>\r
  32 #include <core/frame/frame.h>\r
  33 #include <core/mixer/audio/audio_util.h>\r
  34 #include <core/mixer/audio/audio_mixer.h>\r
  35 #include <core/video_format.h>\r
  36 \r
  37 #include <boost/circular_buffer.hpp>\r
  38 #include <boost/lexical_cast.hpp>\r
  39 #include <boost/property_tree/ptree.hpp>\r
  40 #include <boost/timer.hpp>\r
  41 #include <boost/foreach.hpp>\r
  42 \r
  43 #include <tbb/concurrent_queue.h>\r
  44 \r
  45 #include <al/alc.h>\r
  46 #include <al/al.h>\r
  47 \r
  48 #include <array>\r
  49 \r
  50 namespace caspar { namespace oal {\r
  51 \r
  52 typedef std::vector<int16_t, tbb::cache_aligned_allocator<int16_t>> audio_buffer_16;\r
  53 \r
  54 struct oal_consumer : public core::frame_consumer\r
  55 {\r
  56         spl::shared_ptr<diagnostics::graph>                                     graph_;\r
  57         boost::timer                                                                            perf_timer_;\r
  58         int                                                                                                     channel_index_;\r
  59         \r
  60         core::video_format_desc                                                         format_desc_;\r
  61 \r
  62         ALCdevice*                                                                                      device_;\r
  63         ALCcontext*                                                                                     context_;\r
  64         ALuint                                                                                          source_;\r
  65         std::array<ALuint, 3>                                                           buffers_;\r
  66 \r
  67         executor                                                                                        executor_;\r
  68 \r
  69 public:\r
  70         oal_consumer() \r
  71                 : channel_index_(-1)\r
  72                 , device_(0)\r
  73                 , context_(0)\r
  74                 , source_(0)\r
  75                 , executor_(L"oal_consumer")\r
  76         {\r
  77                 buffers_.assign(0);\r
  78 \r
  79                 graph_->set_color("tick-time", diagnostics::color(0.0f, 0.6f, 0.9f));   \r
  80                 graph_->set_color("dropped-frame", diagnostics::color(0.3f, 0.6f, 0.3f));\r
  81                 diagnostics::register_graph(graph_);\r
  82                 \r
  83                 executor_.invoke([=]\r
  84                 {               \r
  85                         device_ = alcOpenDevice(nullptr);\r
  86 \r
  87                         if(!device_)\r
  88                                 BOOST_THROW_EXCEPTION(invalid_operation());\r
  89 \r
  90                         context_ = alcCreateContext(device_, nullptr);\r
  91 \r
  92                         if(!context_)\r
  93                                 BOOST_THROW_EXCEPTION(invalid_operation());\r
  94                         \r
  95                         if(alcMakeContextCurrent(context_) == ALC_FALSE)\r
  96                                 BOOST_THROW_EXCEPTION(invalid_operation());\r
  97                 });\r
  98         }\r
  99 \r
 100         ~oal_consumer()\r
 101         {\r
 102                 executor_.begin_invoke([=]\r
 103                 {               \r
 104                         if(source_)\r
 105                         {\r
 106                                 alSourceStop(source_);\r
 107                                 alDeleteSources(1, &source_);\r
 108                         }\r
 109 \r
 110                         BOOST_FOREACH(auto& buffer, buffers_)\r
 111                         {\r
 112                                 if(buffer)\r
 113                                         alDeleteBuffers(1, &buffer);\r
 114                         };\r
 115 \r
 116                         alcMakeContextCurrent(nullptr);\r
 117 \r
 118                         if(context_)\r
 119                                 alcDestroyContext(context_);\r
 120 \r
 121                         if(device_)\r
 122                                 alcCloseDevice(device_);\r
 123                 });\r
 124         }\r
 125 \r
 126         // frame consumer\r
 127 \r
 128         void initialize(const core::video_format_desc& format_desc, int channel_index) override\r
 129         {\r
 130                 format_desc_    = format_desc;          \r
 131                 channel_index_  = channel_index;\r
 132                 graph_->set_text(print());\r
 133                 \r
 134                 executor_.begin_invoke([=]\r
 135                 {               \r
 136                         alGenBuffers(static_cast<ALsizei>(buffers_.size()), buffers_.data());\r
 137                         alGenSources(1, &source_);\r
 138 \r
 139                         for(std::size_t n = 0; n < buffers_.size(); ++n)\r
 140                         {\r
 141                                 std::vector<int16_t> audio(format_desc_.audio_cadence[n % format_desc_.audio_cadence.size()], 0);\r
 142                                 alBufferData(buffers_[n], AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), 48000);\r
 143                                 alSourceQueueBuffers(source_, 1, &buffers_[n]);\r
 144                         }\r
 145                         \r
 146                         alSourcei(source_, AL_LOOPING, AL_FALSE);\r
 147                 });\r
 148         }\r
 149         \r
 150         bool send(core::const_frame frame) override\r
 151         {                       \r
 152                 executor_.begin_invoke([=]\r
 153                 {\r
 154                         ALenum state; \r
 155                         alGetSourcei(source_, AL_SOURCE_STATE,&state);\r
 156                         if(state != AL_PLAYING)\r
 157                                 alSourcePlay(source_);                  \r
 158 \r
 159                         auto audio = core::audio_32_to_16(frame.audio_data());\r
 160                         \r
 161                         ALuint buffer = 0;  \r
 162                         alSourceUnqueueBuffers(source_, 1, &buffer);\r
 163                         if(buffer)\r
 164                         {\r
 165                                 alBufferData(buffer, AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), 48000);\r
 166                                 alSourceQueueBuffers(source_, 1, &buffer);\r
 167                         }\r
 168                         else\r
 169                                 graph_->set_tag("dropped-frame");\r
 170 \r
 171                         graph_->set_value("tick-time", perf_timer_.elapsed()*format_desc_.fps*0.5);             \r
 172                         perf_timer_.restart();\r
 173                 });\r
 174 \r
 175                 return true;\r
 176         }\r
 177         \r
 178         std::wstring print() const override\r
 179         {\r
 180                 return L"oal[" + boost::lexical_cast<std::wstring>(channel_index_) + L"|" + format_desc_.name + L"]";\r
 181         }\r
 182 \r
 183         std::wstring name() const override\r
 184         {\r
 185                 return L"system-audio";\r
 186         }\r
 187 \r
 188         boost::property_tree::wptree info() const override\r
 189         {\r
 190                 boost::property_tree::wptree info;\r
 191                 info.add(L"type", L"system-audio");\r
 192                 return info;\r
 193         }\r
 194         \r
 195         bool has_synchronization_clock() const override\r
 196         {\r
 197                 return false;\r
 198         }\r
 199         \r
 200         int buffer_depth() const override\r
 201         {\r
 202                 return 3;\r
 203         }\r
 204                 \r
 205         int index() const override\r
 206         {\r
 207                 return 500;\r
 208         }\r
 209 };\r
 210 \r
 211 spl::shared_ptr<core::frame_consumer> create_consumer(const std::vector<std::wstring>& params)\r
 212 {\r
 213         if(params.size() < 1 || params[0] != L"AUDIO")\r
 214                 return core::frame_consumer::empty();\r
 215 \r
 216         return spl::make_shared<oal_consumer>();\r
 217 }\r
 218 \r
 219 spl::shared_ptr<core::frame_consumer> create_consumer()\r
 220 {\r
 221         return spl::make_shared<oal_consumer>();\r
 222 }\r
 223 \r
 224 }}\r