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

   1 /*\r
   2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 *  This file is part of CasparCG.\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 */\r
  20  \r
  21 #include "../../StdAfx.h"\r
  22 \r
  23 #include "oal_consumer.h"\r
  24 \r
  25 #include "../../processor/frame.h"\r
  26 #include "../../format/video_format.h"\r
  27 \r
  28 #include <SFML/Audio.hpp>\r
  29 \r
  30 #include <boost/circular_buffer.hpp>\r
  31 \r
  32 namespace caspar { namespace core { namespace oal {     \r
  33 \r
  34 struct consumer::implementation : public sf::SoundStream, boost::noncopyable\r
  35 {\r
  36         implementation() : container_(5), underrun_count_(0)\r
  37         {\r
  38                 input_.set_capacity(3);\r
  39                 sf::SoundStream::Initialize(2, 48000);\r
  40         }\r
  41 \r
  42         ~implementation()\r
  43         {\r
  44                 input_.clear();\r
  45                 Stop();\r
  46         }\r
  47         \r
  48         void push(const frame_ptr& frame)\r
  49         {\r
  50                 // NOTE: tbb::concurrent_queue does not have rvalue support. \r
  51                 // Use shared_ptr to emulate move semantics\r
  52                 input_.push(std::make_shared<std::vector<short>>(std::move(frame->get_audio_data()))); \r
  53                 \r
  54                 if(GetStatus() != Playing && input_.size() > 2)\r
  55                         Play();\r
  56         }\r
  57         \r
  58         bool OnStart() \r
  59         {\r
  60                 input_.clear();\r
  61                 return true;\r
  62         }\r
  63 \r
  64         bool OnGetData(sf::SoundStream::Chunk& data)\r
  65         {\r
  66                 static std::vector<short> silence(1920*2, 0);\r
  67                 \r
  68                 std::shared_ptr<std::vector<short>> audio_data;\r
  69                 \r
  70                 if(!input_.try_pop(audio_data))\r
  71                 {\r
  72                         if(underrun_count_ == 0)\r
  73                                 CASPAR_LOG(trace) << "### Sound Input underflow has STARTED.";\r
  74                         ++underrun_count_;\r
  75                         input_.pop(audio_data);\r
  76                 }\r
  77                 else if(underrun_count_ > 0)\r
  78                 {\r
  79                         CASPAR_LOG(trace) << "### Sound Input Underrun has ENDED with " << underrun_count_ << " ticks.";\r
  80                         underrun_count_ = 0;\r
  81                 }\r
  82                         \r
  83                 if(audio_data->empty())\r
  84                 {       \r
  85                         data.Samples = silence.data();\r
  86                         data.NbSamples = silence.size();\r
  87                 }\r
  88                 else\r
  89                 {\r
  90                         container_.push_back(std::move(*audio_data));\r
  91                         data.Samples = container_.back().data();\r
  92                         data.NbSamples = container_.back().size();\r
  93                 }\r
  94                 return true;\r
  95         }\r
  96 \r
  97         long underrun_count_;\r
  98         boost::circular_buffer<std::vector<short>> container_;\r
  99         tbb::concurrent_bounded_queue<std::shared_ptr<std::vector<short>>> input_;\r
 100 };\r
 101 \r
 102 consumer::consumer(const video_format_desc&) : impl_(new implementation()){}\r
 103 void consumer::prepare(const frame_ptr& frame){impl_->push(frame);}\r
 104 }}}\r