git.sesse.net Git - casparcg/blob - core/mixer/audio/audio_mixer.cpp

   1 /*\r
   2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 *  This file is part of CasparCG.\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 */\r
  20 #include "../../stdafx.h"\r
  21 \r
  22 #include "audio_mixer.h"\r
  23 \r
  24 #include <core/mixer/write_frame.h>\r
  25 #include <core/producer/frame/frame_transform.h>\r
  26 \r
  27 #include <tbb/parallel_for.h>\r
  28 \r
  29 #include <safeint.h>\r
  30 \r
  31 #include <stack>\r
  32 #include <deque>\r
  33 \r
  34 namespace caspar { namespace core {\r
  35 \r
  36 struct audio_item\r
  37 {\r
  38         const void*                     tag;\r
  39         frame_transform         transform;\r
  40         audio_buffer            audio_data;\r
  41 };\r
  42         \r
  43 struct audio_mixer::implementation\r
  44 {\r
  45         std::stack<core::frame_transform>                               transform_stack_;\r
  46         std::map<const void*, core::frame_transform>    prev_frame_transforms_;\r
  47         const core::video_format_desc                                   format_desc_;\r
  48         std::vector<audio_item>                                                 items;\r
  49 \r
  50 public:\r
  51         implementation(const core::video_format_desc& format_desc)\r
  52                 : format_desc_(format_desc)\r
  53         {\r
  54                 transform_stack_.push(core::frame_transform());\r
  55         }\r
  56         \r
  57         void begin(core::basic_frame& frame)\r
  58         {\r
  59                 transform_stack_.push(transform_stack_.top()*frame.get_frame_transform());\r
  60         }\r
  61 \r
  62         void visit(core::write_frame& frame)\r
  63         {\r
  64                 // We only care about the last field.\r
  65                 if(format_desc_.field_mode == field_mode::upper && transform_stack_.top().field_mode == field_mode::upper)\r
  66                         return;\r
  67 \r
  68                 if(format_desc_.field_mode == field_mode::lower && transform_stack_.top().field_mode == field_mode::lower)\r
  69                         return;\r
  70 \r
  71                 // Skip empty audio.\r
  72                 if(transform_stack_.top().volume < 0.002 || frame.audio_data().empty())\r
  73                         return;\r
  74 \r
  75                 audio_item item;\r
  76                 item.tag                = frame.tag();\r
  77                 item.transform  = transform_stack_.top();\r
  78                 item.audio_data = std::move(frame.audio_data());\r
  79 \r
  80                 items.push_back(item);          \r
  81         }\r
  82 \r
  83         void begin(const core::frame_transform& transform)\r
  84         {\r
  85                 transform_stack_.push(transform_stack_.top()*transform);\r
  86         }\r
  87                 \r
  88         void end()\r
  89         {\r
  90                 transform_stack_.pop();\r
  91         }\r
  92         \r
  93         audio_buffer mix()\r
  94         {\r
  95                 auto result = audio_buffer(format_desc_.audio_samples_per_frame, 0);\r
  96 \r
  97                 std::map<const void*, core::frame_transform> next_frame_transforms;\r
  98 \r
  99                 BOOST_FOREACH(auto& item, items)\r
 100                 {                               \r
 101                         const auto next = item.transform;\r
 102                         auto prev = next;\r
 103 \r
 104                         const auto it = prev_frame_transforms_.find(item.tag);\r
 105                         if(it != prev_frame_transforms_.end())\r
 106                                 prev = it->second;\r
 107                                 \r
 108                         next_frame_transforms[item.tag] = next; // Store all active tags, inactive tags will be removed at the end.\r
 109                                 \r
 110                         if(next.volume < 0.001 && prev.volume < 0.001)\r
 111                                 continue;\r
 112                                                                         \r
 113                         if(static_cast<size_t>(item.audio_data.size()) != format_desc_.audio_samples_per_frame)\r
 114                                 continue;\r
 115 \r
 116                         CASPAR_ASSERT(format_desc_.audio_channels == 2);\r
 117                         CASPAR_ASSERT(format_desc_.audio_samples_per_frame % 4 == 0);\r
 118                                                 \r
 119                         const float prev_volume = static_cast<float>(prev.volume);\r
 120                         const float next_volume = static_cast<float>(next.volume);\r
 121                         const float delta               = 1.0f/static_cast<float>(format_desc_.audio_samples_per_frame/2);\r
 122                         \r
 123                         tbb::parallel_for\r
 124                         (\r
 125                                 tbb::blocked_range<size_t>(0, format_desc_.audio_samples_per_frame/4),\r
 126                                 [&](const tbb::blocked_range<size_t>& r)\r
 127                                 {\r
 128                                         for(size_t n = r.begin(); n < r.end(); ++n)\r
 129                                         {\r
 130                                                 const float alpha0              = (n*2) * delta;\r
 131                                                 const float volume0             = prev_volume * (1.0f - alpha0) + next_volume * alpha0;\r
 132                                                 const float volume1             = prev_volume * (1.0f - alpha0 + delta) + next_volume * (alpha0 + delta);\r
 133 \r
 134                                                 auto sample_epi32               = _mm_load_si128(reinterpret_cast<__m128i*>(&item.audio_data[n*4]));\r
 135 \r
 136                                                 auto sample_ps                  = _mm_cvtepi32_ps(sample_epi32);                                                                                                \r
 137                                                 sample_ps                               = _mm_mul_ps(sample_ps, _mm_setr_ps(volume1, volume1, volume0, volume0));       \r
 138 \r
 139                                                 auto res_sample_epi32   = _mm_load_si128(reinterpret_cast<__m128i*>(&result[n*4]));\r
 140                                                 auto res_sample_ps              = _mm_cvtepi32_ps(res_sample_epi32);    \r
 141 \r
 142                                                 res_sample_ps                   = _mm_add_ps(sample_ps, res_sample_ps);\r
 143                                                 res_sample_epi32                = _mm_cvtps_epi32(res_sample_ps);\r
 144                                                 \r
 145                                                 _mm_store_si128(reinterpret_cast<__m128i*>(&result[n*4]), res_sample_epi32);\r
 146                                         }\r
 147                                 }\r
 148                         );\r
 149                 }\r
 150 \r
 151                 items.clear();\r
 152                 prev_frame_transforms_ = std::move(next_frame_transforms);      \r
 153 \r
 154                 return std::move(result);\r
 155         }\r
 156 };\r
 157 \r
 158 audio_mixer::audio_mixer(const core::video_format_desc& format_desc) : impl_(new implementation(format_desc)){}\r
 159 void audio_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
 160 void audio_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
 161 void audio_mixer::end(){impl_->end();}\r
 162 audio_buffer audio_mixer::mix(){return impl_->mix();}\r
 163 audio_mixer& audio_mixer::operator=(audio_mixer&& other)\r
 164 {\r
 165         impl_ = std::move(other.impl_);\r
 166         return *this;\r
 167 }\r
 168 \r
 169 }}