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[casparcg] / core / mixer / audio / audio_mixer.cpp
1 /*\r
2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>\r
3 *\r
4 * This file is part of CasparCG (www.casparcg.com).\r
5 *\r
6 * CasparCG is free software: you can redistribute it and/or modify\r
7 * it under the terms of the GNU General Public License as published by\r
8 * the Free Software Foundation, either version 3 of the License, or\r
9 * (at your option) any later version.\r
10 *\r
11 * CasparCG is distributed in the hope that it will be useful,\r
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
14 * GNU General Public License for more details.\r
15 *\r
16 * You should have received a copy of the GNU General Public License\r
17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.\r
18 *\r
19 * Author: Robert Nagy, ronag89@gmail.com\r
20 */\r
21 \r
22 #include "../../stdafx.h"\r
23 \r
24 #include "audio_mixer.h"\r
25 \r
26 #include <core/mixer/write_frame.h>\r
27 #include <core/producer/frame/frame_transform.h>\r
28 #include <common/diagnostics/graph.h>\r
29 \r
30 #include <tbb/cache_aligned_allocator.h>\r
31 \r
32 #include <boost/range/adaptors.hpp>\r
33 #include <boost/range/distance.hpp>\r
34 \r
35 #include <map>\r
36 #include <stack>\r
37 #include <vector>\r
38 \r
39 namespace caspar { namespace core {\r
40 \r
41 struct audio_item\r
42 {\r
43         const void*                     tag;\r
44         frame_transform         transform;\r
45         audio_buffer            audio_data;\r
46 \r
47         audio_item()\r
48         {\r
49         }\r
50 \r
51         audio_item(audio_item&& other)\r
52                 : tag(std::move(other.tag))\r
53                 , transform(std::move(other.transform))\r
54                 , audio_data(std::move(other.audio_data))\r
55         {\r
56         }\r
57 };\r
58 \r
59 typedef std::vector<float, tbb::cache_aligned_allocator<float>> audio_buffer_ps;\r
60         \r
61 struct audio_stream\r
62 {\r
63         frame_transform         prev_transform;\r
64         audio_buffer_ps         audio_data;\r
65 };\r
66 \r
67 struct audio_mixer::implementation\r
68 {\r
69         safe_ptr<diagnostics::graph>            graph_;\r
70         std::stack<core::frame_transform>       transform_stack_;\r
71         std::map<const void*, audio_stream>     audio_streams_;\r
72         std::vector<audio_item>                         items_;\r
73         std::vector<int>                                        audio_cadence_;\r
74         video_format_desc                                       format_desc_;\r
75         \r
76 public:\r
77         implementation(const safe_ptr<diagnostics::graph>& graph)\r
78                 : graph_(graph)\r
79         {\r
80                 graph_->set_color("volume", diagnostics::color(1.0f, 0.8f, 0.1f));\r
81                 transform_stack_.push(core::frame_transform());\r
82         }\r
83         \r
84         void begin(core::basic_frame& frame)\r
85         {\r
86                 transform_stack_.push(transform_stack_.top()*frame.get_frame_transform());\r
87         }\r
88 \r
89         void visit(core::write_frame& frame)\r
90         {\r
91                 if(transform_stack_.top().volume < 0.002 || frame.audio_data().empty())\r
92                         return;\r
93 \r
94                 audio_item item;\r
95                 item.tag                = frame.tag();\r
96                 item.transform  = transform_stack_.top();\r
97                 item.audio_data = std::move(frame.audio_data()); // Note: We don't need to care about upper/lower since audio_data is removed/moved from the last field.\r
98                 \r
99                 items_.push_back(std::move(item));              \r
100         }\r
101 \r
102         void begin(const core::frame_transform& transform)\r
103         {\r
104                 transform_stack_.push(transform_stack_.top()*transform);\r
105         }\r
106                 \r
107         void end()\r
108         {\r
109                 transform_stack_.pop();\r
110         }\r
111         \r
112         audio_buffer mix(const video_format_desc& format_desc)\r
113         {       \r
114                 if(format_desc_ != format_desc)\r
115                 {\r
116                         audio_streams_.clear();\r
117                         audio_cadence_ = format_desc.audio_cadence;\r
118                         format_desc_ = format_desc;\r
119                 }               \r
120                 \r
121                 std::map<const void*, audio_stream>     next_audio_streams;\r
122 \r
123                 BOOST_FOREACH(auto& item, items_)\r
124                 {                       \r
125                         audio_buffer_ps next_audio;\r
126 \r
127                         auto next_transform = item.transform;\r
128                         auto prev_transform = next_transform;\r
129 \r
130                         const auto it = audio_streams_.find(item.tag);\r
131                         if(it != audio_streams_.end())\r
132                         {       \r
133                                 prev_transform  = it->second.prev_transform;\r
134                                 next_audio              = std::move(it->second.audio_data);\r
135                         }\r
136                                                 \r
137                         const float prev_volume = static_cast<float>(prev_transform.volume);\r
138                         const float next_volume = static_cast<float>(next_transform.volume);\r
139                                                                         \r
140                         auto alpha = (next_volume-prev_volume)/static_cast<float>(item.audio_data.size()/format_desc.audio_channels);\r
141                         \r
142                         for(size_t n = 0; n < item.audio_data.size(); ++n)\r
143                                 next_audio.push_back(item.audio_data[n] * (prev_volume + (n/format_desc_.audio_channels) * alpha));\r
144                                                                                 \r
145                         next_audio_streams[item.tag].prev_transform  = std::move(next_transform); // Store all active tags, inactive tags will be removed at the end.\r
146                         next_audio_streams[item.tag].audio_data          = std::move(next_audio);                       \r
147                 }                               \r
148 \r
149                 items_.clear();\r
150 \r
151                 audio_streams_ = std::move(next_audio_streams);\r
152                 \r
153                 if(audio_streams_.empty())              \r
154                         audio_streams_[nullptr].audio_data = audio_buffer_ps(audio_cadence_.front(), 0.0f);\r
155                                 \r
156                 { // sanity check\r
157 \r
158                         auto nb_invalid_streams = boost::count_if(audio_streams_ | boost::adaptors::map_values, [&](const audio_stream& x)\r
159                         {\r
160                                 return x.audio_data.size() < audio_cadence_.front();\r
161                         });\r
162 \r
163                         if(nb_invalid_streams > 0)              \r
164                                 CASPAR_LOG(trace) << "[audio_mixer] Incorrect frame audio cadence detected.";                   \r
165                 }\r
166 \r
167                 std::vector<float> result_ps(audio_cadence_.front(), 0.0f);\r
168                 BOOST_FOREACH(auto& stream, audio_streams_ | boost::adaptors::map_values)\r
169                 {\r
170                         //CASPAR_LOG(debug) << stream.audio_data.size() << L" : " << result_ps.size();\r
171 \r
172                         if(stream.audio_data.size() < result_ps.size())\r
173                         {\r
174                                 stream.audio_data.resize(result_ps.size(), 0.0f);\r
175                                 CASPAR_LOG(trace) << L"[audio_mixer] Appended zero samples";\r
176                         }\r
177 \r
178                         auto out = boost::range::transform(result_ps, stream.audio_data, std::begin(result_ps), std::plus<float>());\r
179                         stream.audio_data.erase(std::begin(stream.audio_data), std::begin(stream.audio_data) + std::distance(std::begin(result_ps), out));\r
180                 }               \r
181                 \r
182                 boost::range::rotate(audio_cadence_, std::begin(audio_cadence_)+1);\r
183                 \r
184                 audio_buffer result;\r
185                 result.reserve(result_ps.size());\r
186                 boost::range::transform(result_ps, std::back_inserter(result), [](float sample){return static_cast<int32_t>(sample);});         \r
187 \r
188                 auto max = boost::range::max_element(result);\r
189 \r
190                 graph_->set_value("volume", static_cast<double>(std::abs(*max))/std::numeric_limits<int32_t>::max());\r
191 \r
192                 return result;\r
193         }\r
194 };\r
195 \r
196 audio_mixer::audio_mixer(const safe_ptr<diagnostics::graph>& graph) : impl_(new implementation(graph)){}\r
197 void audio_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
198 void audio_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
199 void audio_mixer::end(){impl_->end();}\r
200 audio_buffer audio_mixer::operator()(const video_format_desc& format_desc){return impl_->mix(format_desc);}\r
201 \r
202 }}