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/foreach.hpp>
  43 #include <boost/thread/once.hpp>
  44
  45 #include <tbb/concurrent_queue.h>
  46
  47 #include <al/alc.h>
  48 #include <al/al.h>
  49
  50 #include <array>
  51
  52 namespace caspar { namespace oal {
  53
  54 typedef std::vector<int16_t, tbb::cache_aligned_allocator<int16_t>> audio_buffer_16;
  55
  56 class device
  57 {
  58         ALCdevice*                                                                                      device_;
  59         ALCcontext*                                                                                     context_;
  60
  61 public:
  62         device()
  63                 : device_(0)
  64                 , context_(0)
  65         {
  66                 device_ = alcOpenDevice(nullptr);
  67
  68                 if(!device_)
  69                         CASPAR_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to initialize audio device."));
  70
  71                 context_ = alcCreateContext(device_, nullptr);
  72
  73                 if(!context_)
  74                         CASPAR_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to create audio context."));
  75
  76                 if(alcMakeContextCurrent(context_) == ALC_FALSE)
  77                         CASPAR_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to activate audio context."));
  78         }
  79
  80         ~device()
  81         {
  82                 alcMakeContextCurrent(nullptr);
  83
  84                 if(context_)
  85                         alcDestroyContext(context_);
  86
  87                 if(device_)
  88                         alcCloseDevice(device_);
  89         }
  90
  91         ALCdevice* get()
  92         {
  93                 return device_;
  94         }
  95 };
  96
  97 void init_device()
  98 {
  99         static std::unique_ptr<device> instance;
 100         static boost::once_flag f = BOOST_ONCE_INIT;
 101
 102         boost::call_once(f, []{instance.reset(new device());});
 103 }
 104
 105 struct oal_consumer : public core::frame_consumer
 106 {
 107         spl::shared_ptr<diagnostics::graph>                                     graph_;
 108         boost::timer                                                                            perf_timer_;
 109         int                                                                                                     channel_index_;
 110
 111         core::video_format_desc                                                         format_desc_;
 112
 113         ALuint                                                                                          source_;
 114         std::array<ALuint, 3>                                                           buffers_;
 115
 116         executor                                                                                        executor_;
 117
 118 public:
 119         oal_consumer()
 120                 : channel_index_(-1)
 121                 , source_(0)
 122                 , executor_(L"oal_consumer")
 123         {
 124                 buffers_.assign(0);
 125
 126                 init_device();
 127
 128                 graph_->set_color("tick-time", diagnostics::color(0.0f, 0.6f, 0.9f));
 129                 graph_->set_color("dropped-frame", diagnostics::color(0.3f, 0.6f, 0.3f));
 130                 graph_->set_color("late-frame", diagnostics::color(0.6f, 0.3f, 0.3f));
 131                 diagnostics::register_graph(graph_);
 132         }
 133
 134         ~oal_consumer()
 135         {
 136                 executor_.begin_invoke([=]
 137                 {
 138                         if(source_)
 139                         {
 140                                 alSourceStop(source_);
 141                                 alDeleteSources(1, &source_);
 142                         }
 143
 144                         BOOST_FOREACH(auto& buffer, buffers_)
 145                         {
 146                                 if(buffer)
 147                                         alDeleteBuffers(1, &buffer);
 148                         };
 149                 });
 150         }
 151
 152         // frame consumer
 153
 154         void initialize(const core::video_format_desc& format_desc, int channel_index) override
 155         {
 156                 format_desc_    = format_desc;
 157                 channel_index_  = channel_index;
 158                 graph_->set_text(print());
 159
 160                 executor_.begin_invoke([=]
 161                 {
 162                         alGenBuffers(static_cast<ALsizei>(buffers_.size()), buffers_.data());
 163                         alGenSources(1, &source_);
 164
 165                         for(std::size_t n = 0; n < buffers_.size(); ++n)
 166                         {
 167                                 std::vector<int16_t> audio(format_desc_.audio_cadence[n % format_desc_.audio_cadence.size()], 0);
 168                                 alBufferData(buffers_[n], AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), format_desc_.audio_sample_rate);
 169                                 alSourceQueueBuffers(source_, 1, &buffers_[n]);
 170                         }
 171
 172                         alSourcei(source_, AL_LOOPING, AL_FALSE);
 173
 174                         alSourcePlay(source_);
 175                 });
 176         }
 177
 178         boost::unique_future<bool> send(core::const_frame frame) override
 179         {
 180                 // Will only block if the default executor queue capacity of 512 is
 181                 // exhausted, which should not happen
 182                 executor_.begin_invoke([=]
 183                 {
 184                         ALenum state;
 185                         alGetSourcei(source_, AL_SOURCE_STATE,&state);
 186                         if(state != AL_PLAYING)
 187                         {
 188                                 for(int n = 0; n < buffers_.size()-1; ++n)
 189                                 {
 190                                         ALuint buffer = 0;
 191                                         alSourceUnqueueBuffers(source_, 1, &buffer);
 192                                         if(buffer)
 193                                         {
 194                                                 std::vector<int16_t> audio(format_desc_.audio_cadence[n % format_desc_.audio_cadence.size()], 0);
 195                                                 alBufferData(buffer, AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), format_desc_.audio_sample_rate);
 196                                                 alSourceQueueBuffers(source_, 1, &buffer);
 197                                         }
 198                                 }
 199                                 alSourcePlay(source_);
 200                                 graph_->set_tag("late-frame");
 201                         }
 202
 203                         auto audio = core::audio_32_to_16(frame.audio_data());
 204
 205                         ALuint buffer = 0;
 206                         alSourceUnqueueBuffers(source_, 1, &buffer);
 207                         if(buffer)
 208                         {
 209                                 alBufferData(buffer, AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), format_desc_.audio_sample_rate);
 210                                 alSourceQueueBuffers(source_, 1, &buffer);
 211                         }
 212                         else
 213                                 graph_->set_tag("dropped-frame");
 214
 215                         graph_->set_value("tick-time", perf_timer_.elapsed()*format_desc_.fps*0.5);
 216                         perf_timer_.restart();
 217                 });
 218
 219                 return wrap_as_future(true);
 220         }
 221
 222         std::wstring print() const override
 223         {
 224                 return L"oal[" + boost::lexical_cast<std::wstring>(channel_index_) + L"|" + format_desc_.name + L"]";
 225         }
 226
 227         std::wstring name() const override
 228         {
 229                 return L"system-audio";
 230         }
 231
 232         boost::property_tree::wptree info() const override
 233         {
 234                 boost::property_tree::wptree info;
 235                 info.add(L"type", L"system-audio");
 236                 return info;
 237         }
 238
 239         bool has_synchronization_clock() const override
 240         {
 241                 return false;
 242         }
 243
 244         int buffer_depth() const override
 245         {
 246                 return 3;
 247         }
 248
 249         int index() const override
 250         {
 251                 return 500;
 252         }
 253
 254         void subscribe(const monitor::observable::observer_ptr& o) override
 255         {
 256         }
 257
 258         void unsubscribe(const monitor::observable::observer_ptr& o) override
 259         {
 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 }}