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         monitor::subject                                                                        monitor_subject_;
 108
 109         spl::shared_ptr<diagnostics::graph>                                     graph_;
 110         boost::timer                                                                            perf_timer_;
 111         int                                                                                                     channel_index_;
 112
 113         core::video_format_desc                                                         format_desc_;
 114
 115         ALuint                                                                                          source_;
 116         std::array<ALuint, 3>                                                           buffers_;
 117
 118         executor                                                                                        executor_;
 119
 120 public:
 121         oal_consumer()
 122                 : channel_index_(-1)
 123                 , source_(0)
 124                 , executor_(L"oal_consumer")
 125         {
 126                 buffers_.assign(0);
 127
 128                 init_device();
 129
 130                 graph_->set_color("tick-time", diagnostics::color(0.0f, 0.6f, 0.9f));
 131                 graph_->set_color("dropped-frame", diagnostics::color(0.3f, 0.6f, 0.3f));
 132                 graph_->set_color("late-frame", diagnostics::color(0.6f, 0.3f, 0.3f));
 133                 diagnostics::register_graph(graph_);
 134         }
 135
 136         ~oal_consumer()
 137         {
 138                 executor_.begin_invoke([=]
 139                 {
 140                         if(source_)
 141                         {
 142                                 alSourceStop(source_);
 143                                 alDeleteSources(1, &source_);
 144                         }
 145
 146                         BOOST_FOREACH(auto& buffer, buffers_)
 147                         {
 148                                 if(buffer)
 149                                         alDeleteBuffers(1, &buffer);
 150                         };
 151                 });
 152         }
 153
 154         // frame consumer
 155
 156         void initialize(const core::video_format_desc& format_desc, int channel_index) override
 157         {
 158                 format_desc_    = format_desc;
 159                 channel_index_  = channel_index;
 160                 graph_->set_text(print());
 161
 162                 executor_.begin_invoke([=]
 163                 {
 164                         alGenBuffers(static_cast<ALsizei>(buffers_.size()), buffers_.data());
 165                         alGenSources(1, &source_);
 166
 167                         for(std::size_t n = 0; n < buffers_.size(); ++n)
 168                         {
 169                                 std::vector<int16_t> audio(format_desc_.audio_cadence[n % format_desc_.audio_cadence.size()]*format_desc_.audio_channels, 0);
 170                                 alBufferData(buffers_[n], AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), format_desc_.audio_sample_rate);
 171                                 alSourceQueueBuffers(source_, 1, &buffers_[n]);
 172                         }
 173
 174                         alSourcei(source_, AL_LOOPING, AL_FALSE);
 175
 176                         alSourcePlay(source_);
 177                 });
 178         }
 179
 180         boost::unique_future<bool> send(core::const_frame frame) override
 181         {
 182                 // Will only block if the default executor queue capacity of 512 is
 183                 // exhausted, which should not happen
 184                 executor_.begin_invoke([=]
 185                 {
 186                         ALenum state;
 187                         alGetSourcei(source_, AL_SOURCE_STATE,&state);
 188                         if(state != AL_PLAYING)
 189                         {
 190                                 for(int n = 0; n < buffers_.size()-1; ++n)
 191                                 {
 192                                         ALuint buffer = 0;
 193                                         alSourceUnqueueBuffers(source_, 1, &buffer);
 194                                         if(buffer)
 195                                         {
 196                                                 std::vector<int16_t> audio(format_desc_.audio_cadence[n % format_desc_.audio_cadence.size()] * format_desc_.audio_channels, 0);
 197                                                 alBufferData(buffer, AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), format_desc_.audio_sample_rate);
 198                                                 alSourceQueueBuffers(source_, 1, &buffer);
 199                                         }
 200                                 }
 201                                 alSourcePlay(source_);
 202                                 graph_->set_tag("late-frame");
 203                         }
 204
 205                         auto audio = core::audio_32_to_16(frame.audio_data());
 206
 207                         ALuint buffer = 0;
 208                         alSourceUnqueueBuffers(source_, 1, &buffer);
 209                         if(buffer)
 210                         {
 211                                 alBufferData(buffer, AL_FORMAT_STEREO16, audio.data(), static_cast<ALsizei>(audio.size()*sizeof(int16_t)), format_desc_.audio_sample_rate);
 212                                 alSourceQueueBuffers(source_, 1, &buffer);
 213                         }
 214                         else
 215                                 graph_->set_tag("dropped-frame");
 216
 217                         graph_->set_value("tick-time", perf_timer_.elapsed()*format_desc_.fps*0.5);
 218                         perf_timer_.restart();
 219                 });
 220
 221                 return wrap_as_future(true);
 222         }
 223
 224         std::wstring print() const override
 225         {
 226                 return L"oal[" + boost::lexical_cast<std::wstring>(channel_index_) + L"|" + format_desc_.name + L"]";
 227         }
 228
 229         std::wstring name() const override
 230         {
 231                 return L"system-audio";
 232         }
 233
 234         boost::property_tree::wptree info() const override
 235         {
 236                 boost::property_tree::wptree info;
 237                 info.add(L"type", L"system-audio");
 238                 return info;
 239         }
 240
 241         bool has_synchronization_clock() const override
 242         {
 243                 return false;
 244         }
 245
 246         int delay_millis() const
 247         {
 248                 return 60;
 249         }
 250
 251         int buffer_depth() const override
 252         {
 253                 int delay_in_frames = static_cast<int>(delay_millis() / (1000.0 / format_desc_.fps));
 254
 255                 return delay_in_frames;
 256         }
 257
 258         int index() const override
 259         {
 260                 return 500;
 261         }
 262
 263         monitor::source& monitor_output()
 264         {
 265                 return monitor_subject_;
 266         }
 267 };
 268
 269 spl::shared_ptr<core::frame_consumer> create_consumer(const std::vector<std::wstring>& params)
 270 {
 271         if(params.size() < 1 || params[0] != L"AUDIO")
 272                 return core::frame_consumer::empty();
 273
 274         return spl::make_shared<oal_consumer>();
 275 }
 276
 277 spl::shared_ptr<core::frame_consumer> create_consumer()
 278 {
 279         return spl::make_shared<oal_consumer>();
 280 }
 281
 282 }}