git.sesse.net Git - casparcg/blob - modules/oal/consumer/oal_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 "oal_consumer.h"
  23
  24 #include <common/except.h>
  25 #include <common/executor.h>
  26 #include <common/diagnostics/graph.h>
  27 #include <common/log.h>
  28 #include <common/utf.h>
  29 #include <common/env.h>
  30
  31 #include <core/consumer/frame_consumer.h>
  32 #include <core/frame/frame.h>
  33 #include <core/mixer/audio/audio_util.h>
  34 #include <core/mixer/audio/audio_mixer.h>
  35 #include <core/video_format.h>
  36
  37 #include <boost/circular_buffer.hpp>
  38 #include <boost/lexical_cast.hpp>
  39 #include <boost/property_tree/ptree.hpp>
  40 #include <boost/timer.hpp>
  41 #include <boost/foreach.hpp>
  42 #include <boost/thread/once.hpp>
  43
  44 #include <tbb/concurrent_queue.h>
  45
  46 #include <al/alc.h>
  47 #include <al/al.h>
  48
  49 #include <array>
  50
  51 namespace caspar { namespace oal {
  52
  53 typedef std::vector<int16_t, tbb::cache_aligned_allocator<int16_t>> audio_buffer_16;
  54
  55 class device
  56 {
  57         ALCdevice*                                                                                      device_;
  58         ALCcontext*                                                                                     context_;
  59
  60 public:
  61         device()
  62                 : device_(0)
  63                 , context_(0)
  64         {
  65                 device_ = alcOpenDevice(nullptr);
  66
  67                 if(!device_)
  68                         CASPAR_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to initialize audio device."));
  69
  70                 context_ = alcCreateContext(device_, nullptr);
  71
  72                 if(!context_)
  73                         CASPAR_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to create audio context."));
  74
  75                 if(alcMakeContextCurrent(context_) == ALC_FALSE)
  76                         CASPAR_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to activate audio context."));
  77         }
  78
  79         ~device()
  80         {
  81                 alcMakeContextCurrent(nullptr);
  82
  83                 if(context_)
  84                         alcDestroyContext(context_);
  85
  86                 if(device_)
  87                         alcCloseDevice(device_);
  88         }
  89
  90         ALCdevice* get()
  91         {
  92                 return device_;
  93         }
  94 };
  95
  96 void init_device()
  97 {
  98         static std::unique_ptr<device> instance;
  99         static boost::once_flag f = BOOST_ONCE_INIT;
 100
 101         boost::call_once(f, []{instance.reset(new device());});
 102 }
 103
 104 struct oal_consumer : public core::frame_consumer
 105 {
 106         spl::shared_ptr<diagnostics::graph>                                     graph_;
 107         boost::timer                                                                            perf_timer_;
 108         int                                                                                                     channel_index_;
 109
 110         core::video_format_desc                                                         format_desc_;
 111
 112         ALuint                                                                                          source_;
 113         std::array<ALuint, 3>                                                           buffers_;
 114
 115         executor                                                                                        executor_;
 116
 117 public:
 118         oal_consumer()
 119                 : channel_index_(-1)
 120                 , source_(0)
 121                 , executor_(L"oal_consumer")
 122         {
 123                 buffers_.assign(0);
 124
 125                 init_device();
 126
 127                 graph_->set_color("tick-time", diagnostics::color(0.0f, 0.6f, 0.9f));
 128                 graph_->set_color("dropped-frame", diagnostics::color(0.3f, 0.6f, 0.3f));
 129                 graph_->set_color("late-frame", diagnostics::color(0.6f, 0.3f, 0.3f));
 130                 diagnostics::register_graph(graph_);
 131         }
 132
 133         ~oal_consumer()
 134         {
 135                 executor_.begin_invoke([=]
 136                 {
 137                         if(source_)
 138                         {
 139                                 alSourceStop(source_);
 140                                 alDeleteSources(1, &source_);
 141                         }
 142
 143                         BOOST_FOREACH(auto& buffer, buffers_)
 144                         {
 145                                 if(buffer)
 146                                         alDeleteBuffers(1, &buffer);
 147                         };
 148                 });
 149         }
 150
 151         // frame consumer
 152
 153         void initialize(const core::video_format_desc& format_desc, int channel_index) override
 154         {
 155                 format_desc_    = format_desc;
 156                 channel_index_  = channel_index;
 157                 graph_->set_text(print());
 158
 159                 executor_.begin_invoke([=]
 160                 {
 161                         alGenBuffers(static_cast<ALsizei>(buffers_.size()), buffers_.data());
 162                         alGenSources(1, &source_);
 163
 164                         for(std::size_t n = 0; n < buffers_.size(); ++n)
 165                         {
 166                                 std::vector<int16_t> audio(format_desc_.audio_cadence[n % format_desc_.audio_cadence.size()], 0);
 167                                 alBufferData(buffers_[n], AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), format_desc_.audio_sample_rate);
 168                                 alSourceQueueBuffers(source_, 1, &buffers_[n]);
 169                         }
 170
 171                         alSourcei(source_, AL_LOOPING, AL_FALSE);
 172
 173                         alSourcePlay(source_);
 174                 });
 175         }
 176
 177         bool send(core::const_frame frame) override
 178         {
 179                 executor_.begin_invoke([=]
 180                 {
 181                         ALenum state;
 182                         alGetSourcei(source_, AL_SOURCE_STATE,&state);
 183                         if(state != AL_PLAYING)
 184                         {
 185                                 for(int n = 0; n < buffers_.size()-1; ++n)
 186                                 {
 187                                         ALuint buffer = 0;
 188                                         alSourceUnqueueBuffers(source_, 1, &buffer);
 189                                         if(buffer)
 190                                         {
 191                                                 std::vector<int16_t> audio(format_desc_.audio_cadence[n % format_desc_.audio_cadence.size()], 0);
 192                                                 alBufferData(buffer, AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), format_desc_.audio_sample_rate);
 193                                                 alSourceQueueBuffers(source_, 1, &buffer);
 194                                         }
 195                                 }
 196                                 alSourcePlay(source_);
 197                                 graph_->set_tag("late-frame");
 198                         }
 199
 200                         auto audio = core::audio_32_to_16(frame.audio_data());
 201
 202                         ALuint buffer = 0;
 203                         alSourceUnqueueBuffers(source_, 1, &buffer);
 204                         if(buffer)
 205                         {
 206                                 alBufferData(buffer, AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), format_desc_.audio_sample_rate);
 207                                 alSourceQueueBuffers(source_, 1, &buffer);
 208                         }
 209                         else
 210                                 graph_->set_tag("dropped-frame");
 211
 212                         graph_->set_value("tick-time", perf_timer_.elapsed()*format_desc_.fps*0.5);
 213                         perf_timer_.restart();
 214                 });
 215
 216                 return true;
 217         }
 218
 219         std::wstring print() const override
 220         {
 221                 return L"oal[" + boost::lexical_cast<std::wstring>(channel_index_) + L"|" + format_desc_.name + L"]";
 222         }
 223
 224         std::wstring name() const override
 225         {
 226                 return L"system-audio";
 227         }
 228
 229         boost::property_tree::wptree info() const override
 230         {
 231                 boost::property_tree::wptree info;
 232                 info.add(L"type", L"system-audio");
 233                 return info;
 234         }
 235
 236         bool has_synchronization_clock() const override
 237         {
 238                 return false;
 239         }
 240
 241         int buffer_depth() const override
 242         {
 243                 return 3;
 244         }
 245
 246         int index() const override
 247         {
 248                 return 500;
 249         }
 250
 251         void subscribe(const monitor::observable::observer_ptr& o) override
 252         {
 253         }
 254
 255         void unsubscribe(const monitor::observable::observer_ptr& o) override
 256         {
 257         }
 258 };
 259
 260 spl::shared_ptr<core::frame_consumer> create_consumer(const std::vector<std::wstring>& params)
 261 {
 262         if(params.size() < 1 || params[0] != L"AUDIO")
 263                 return core::frame_consumer::empty();
 264
 265         return spl::make_shared<oal_consumer>();
 266 }
 267
 268 spl::shared_ptr<core::frame_consumer> create_consumer()
 269 {
 270         return spl::make_shared<oal_consumer>();
 271 }
 272
 273 }}