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 #include <common/future.h>
  31
  32 #include <core/consumer/frame_consumer.h>
  33 #include <core/frame/frame.h>
  34 #include <core/mixer/audio/audio_util.h>
  35 #include <core/mixer/audio/audio_mixer.h>
  36 #include <core/video_format.h>
  37
  38 #include <boost/circular_buffer.hpp>
  39 #include <boost/lexical_cast.hpp>
  40 #include <boost/property_tree/ptree.hpp>
  41 #include <boost/timer.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 cache_aligned_vector<int16_t> audio_buffer_16;
  54
  55 class device
  56 {
  57         ALCdevice*              device_         = nullptr;
  58         ALCcontext*             context_        = nullptr;
  59
  60 public:
  61         device()
  62         {
  63                 device_ = alcOpenDevice(nullptr);
  64
  65                 if(!device_)
  66                         CASPAR_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to initialize audio device."));
  67
  68                 context_ = alcCreateContext(device_, nullptr);
  69
  70                 if(!context_)
  71                         CASPAR_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to create audio context."));
  72
  73                 if(alcMakeContextCurrent(context_) == ALC_FALSE)
  74                         CASPAR_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to activate audio context."));
  75         }
  76
  77         ~device()
  78         {
  79                 alcMakeContextCurrent(nullptr);
  80
  81                 if(context_)
  82                         alcDestroyContext(context_);
  83
  84                 if(device_)
  85                         alcCloseDevice(device_);
  86         }
  87
  88         ALCdevice* get()
  89         {
  90                 return device_;
  91         }
  92 };
  93
  94 void init_device()
  95 {
  96         static std::unique_ptr<device> instance;
  97         static boost::once_flag f = BOOST_ONCE_INIT;
  98
  99         boost::call_once(f, []{instance.reset(new device());});
 100 }
 101
 102 struct oal_consumer : public core::frame_consumer
 103 {
 104         core::monitor::subject                          monitor_subject_;
 105
 106         spl::shared_ptr<diagnostics::graph>     graph_;
 107         boost::timer                                            perf_timer_;
 108         int                                                                     channel_index_          = -1;
 109
 110         core::video_format_desc                         format_desc_;
 111
 112         ALuint                                                          source_                         = 0;
 113         std::array<ALuint, 3>                           buffers_;
 114
 115         executor                                                        executor_                       = L"oal_consumer";
 116
 117 public:
 118         oal_consumer()
 119         {
 120                 buffers_.assign(0);
 121
 122                 init_device();
 123
 124                 graph_->set_color("tick-time", diagnostics::color(0.0f, 0.6f, 0.9f));
 125                 graph_->set_color("dropped-frame", diagnostics::color(0.3f, 0.6f, 0.3f));
 126                 graph_->set_color("late-frame", diagnostics::color(0.6f, 0.3f, 0.3f));
 127                 diagnostics::register_graph(graph_);
 128         }
 129
 130         ~oal_consumer()
 131         {
 132                 executor_.begin_invoke([=]
 133                 {
 134                         if(source_)
 135                         {
 136                                 alSourceStop(source_);
 137                                 alDeleteSources(1, &source_);
 138                         }
 139
 140                         for (auto& buffer : buffers_)
 141                         {
 142                                 if(buffer)
 143                                         alDeleteBuffers(1, &buffer);
 144                         };
 145                 });
 146         }
 147
 148         // frame consumer
 149
 150         void initialize(const core::video_format_desc& format_desc, int channel_index) override
 151         {
 152                 format_desc_    = format_desc;
 153                 channel_index_  = channel_index;
 154                 graph_->set_text(print());
 155
 156                 executor_.begin_invoke([=]
 157                 {
 158                         alGenBuffers(static_cast<ALsizei>(buffers_.size()), buffers_.data());
 159                         alGenSources(1, &source_);
 160
 161                         for(std::size_t n = 0; n < buffers_.size(); ++n)
 162                         {
 163                                 std::vector<int16_t> audio(format_desc_.audio_cadence[n % format_desc_.audio_cadence.size()]*format_desc_.audio_channels, 0);
 164                                 alBufferData(buffers_[n], AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), format_desc_.audio_sample_rate);
 165                                 alSourceQueueBuffers(source_, 1, &buffers_[n]);
 166                         }
 167
 168                         alSourcei(source_, AL_LOOPING, AL_FALSE);
 169
 170                         alSourcePlay(source_);
 171                 });
 172         }
 173
 174         std::future<bool> send(core::const_frame frame) override
 175         {
 176                 // Will only block if the default executor queue capacity of 512 is
 177                 // exhausted, which should not happen
 178                 executor_.begin_invoke([=]
 179                 {
 180                         ALenum state;
 181                         alGetSourcei(source_, AL_SOURCE_STATE,&state);
 182                         if(state != AL_PLAYING)
 183                         {
 184                                 for(int n = 0; n < buffers_.size()-1; ++n)
 185                                 {
 186                                         ALuint buffer = 0;
 187                                         alSourceUnqueueBuffers(source_, 1, &buffer);
 188                                         if(buffer)
 189                                         {
 190                                                 std::vector<int16_t> audio(format_desc_.audio_cadence[n % format_desc_.audio_cadence.size()] * format_desc_.audio_channels, 0);
 191                                                 alBufferData(buffer, AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), format_desc_.audio_sample_rate);
 192                                                 alSourceQueueBuffers(source_, 1, &buffer);
 193                                         }
 194                                 }
 195                                 alSourcePlay(source_);
 196                                 graph_->set_tag("late-frame");
 197                         }
 198
 199                         auto audio = core::audio_32_to_16(frame.audio_data());
 200
 201                         ALuint buffer = 0;
 202                         alSourceUnqueueBuffers(source_, 1, &buffer);
 203                         if(buffer)
 204                         {
 205                                 alBufferData(buffer, AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), format_desc_.audio_sample_rate);
 206                                 alSourceQueueBuffers(source_, 1, &buffer);
 207                         }
 208                         else
 209                                 graph_->set_tag("dropped-frame");
 210
 211                         graph_->set_value("tick-time", perf_timer_.elapsed()*format_desc_.fps*0.5);
 212                         perf_timer_.restart();
 213                 });
 214
 215                 return make_ready_future(true);
 216         }
 217
 218         std::wstring print() const override
 219         {
 220                 return L"oal[" + boost::lexical_cast<std::wstring>(channel_index_) + L"|" + format_desc_.name + L"]";
 221         }
 222
 223         std::wstring name() const override
 224         {
 225                 return L"system-audio";
 226         }
 227
 228         boost::property_tree::wptree info() const override
 229         {
 230                 boost::property_tree::wptree info;
 231                 info.add(L"type", L"system-audio");
 232                 return info;
 233         }
 234
 235         bool has_synchronization_clock() const override
 236         {
 237                 return false;
 238         }
 239
 240         int delay_millis() const
 241         {
 242                 return 60;
 243         }
 244
 245         int buffer_depth() const override
 246         {
 247                 int delay_in_frames = static_cast<int>(delay_millis() / (1000.0 / format_desc_.fps));
 248
 249                 return delay_in_frames;
 250         }
 251
 252         int index() const override
 253         {
 254                 return 500;
 255         }
 256
 257         core::monitor::subject& monitor_output()
 258         {
 259                 return monitor_subject_;
 260         }
 261 };
 262
 263 spl::shared_ptr<core::frame_consumer> create_consumer(const std::vector<std::wstring>& params)
 264 {
 265         if(params.size() < 1 || params[0] != L"AUDIO")
 266                 return core::frame_consumer::empty();
 267
 268         return spl::make_shared<oal_consumer>();
 269 }
 270
 271 spl::shared_ptr<core::frame_consumer> create_consumer()
 272 {
 273         return spl::make_shared<oal_consumer>();
 274 }
 275
 276 }}