2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
4 * This file is part of CasparCG (www.casparcg.com).
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.
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.
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/>.
19 * Author: Robert Nagy, ronag89@gmail.com
22 #include "oal_consumer.h"
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>
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>
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>
45 #include <tbb/concurrent_queue.h>
52 namespace caspar { namespace oal {
54 typedef std::vector<int16_t, tbb::cache_aligned_allocator<int16_t>> audio_buffer_16;
66 device_ = alcOpenDevice(nullptr);
69 CASPAR_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to initialize audio device."));
71 context_ = alcCreateContext(device_, nullptr);
74 CASPAR_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to create audio context."));
76 if(alcMakeContextCurrent(context_) == ALC_FALSE)
77 CASPAR_THROW_EXCEPTION(invalid_operation() << msg_info("Failed to activate audio context."));
82 alcMakeContextCurrent(nullptr);
85 alcDestroyContext(context_);
88 alcCloseDevice(device_);
99 static std::unique_ptr<device> instance;
100 static boost::once_flag f = BOOST_ONCE_INIT;
102 boost::call_once(f, []{instance.reset(new device());});
105 struct oal_consumer : public core::frame_consumer
107 monitor::subject monitor_subject_;
109 spl::shared_ptr<diagnostics::graph> graph_;
110 boost::timer perf_timer_;
113 core::video_format_desc format_desc_;
116 std::array<ALuint, 3> buffers_;
124 , executor_(L"oal_consumer")
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_);
138 executor_.begin_invoke([=]
142 alSourceStop(source_);
143 alDeleteSources(1, &source_);
146 BOOST_FOREACH(auto& buffer, buffers_)
149 alDeleteBuffers(1, &buffer);
156 void initialize(const core::video_format_desc& format_desc, int channel_index) override
158 format_desc_ = format_desc;
159 channel_index_ = channel_index;
160 graph_->set_text(print());
162 executor_.begin_invoke([=]
164 alGenBuffers(static_cast<ALsizei>(buffers_.size()), buffers_.data());
165 alGenSources(1, &source_);
167 for(std::size_t n = 0; n < buffers_.size(); ++n)
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]);
174 alSourcei(source_, AL_LOOPING, AL_FALSE);
176 alSourcePlay(source_);
180 boost::unique_future<bool> send(core::const_frame frame) override
182 // Will only block if the default executor queue capacity of 512 is
183 // exhausted, which should not happen
184 executor_.begin_invoke([=]
187 alGetSourcei(source_, AL_SOURCE_STATE,&state);
188 if(state != AL_PLAYING)
190 for(int n = 0; n < buffers_.size()-1; ++n)
193 alSourceUnqueueBuffers(source_, 1, &buffer);
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);
201 alSourcePlay(source_);
202 graph_->set_tag("late-frame");
205 auto audio = core::audio_32_to_16(frame.audio_data());
208 alSourceUnqueueBuffers(source_, 1, &buffer);
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);
215 graph_->set_tag("dropped-frame");
217 graph_->set_value("tick-time", perf_timer_.elapsed()*format_desc_.fps*0.5);
218 perf_timer_.restart();
221 return wrap_as_future(true);
224 std::wstring print() const override
226 return L"oal[" + boost::lexical_cast<std::wstring>(channel_index_) + L"|" + format_desc_.name + L"]";
229 std::wstring name() const override
231 return L"system-audio";
234 boost::property_tree::wptree info() const override
236 boost::property_tree::wptree info;
237 info.add(L"type", L"system-audio");
241 bool has_synchronization_clock() const override
246 int delay_millis() const
251 int buffer_depth() const override
253 int delay_in_frames = static_cast<int>(delay_millis() / (1000.0 / format_desc_.fps));
255 return delay_in_frames;
258 int index() const override
263 monitor::source& monitor_output()
265 return monitor_subject_;
269 spl::shared_ptr<core::frame_consumer> create_consumer(const std::vector<std::wstring>& params)
271 if(params.size() < 1 || params[0] != L"AUDIO")
272 return core::frame_consumer::empty();
274 return spl::make_shared<oal_consumer>();
277 spl::shared_ptr<core::frame_consumer> create_consumer()
279 return spl::make_shared<oal_consumer>();