-/*\r
-* copyright (c) 2010 Sveriges Television AB <info@casparcg.com>\r
-*\r
-* This file is part of CasparCG.\r
-*\r
-* CasparCG is free software: you can redistribute it and/or modify\r
-* it under the terms of the GNU General Public License as published by\r
-* the Free Software Foundation, either version 3 of the License, or\r
-* (at your option) any later version.\r
-*\r
-* CasparCG is distributed in the hope that it will be useful,\r
-* but WITHOUT ANY WARRANTY; without even the implied warranty of\r
-* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r
-* GNU General Public License for more details.\r
-\r
-* You should have received a copy of the GNU General Public License\r
-* along with CasparCG. If not, see <http://www.gnu.org/licenses/>.\r
-*\r
-*/\r
-#include "../../stdafx.h"\r
-\r
-#include "audio_mixer.h"\r
-\r
-#include <core/mixer/write_frame.h>\r
-#include <core/producer/frame/frame_transform.h>\r
-\r
-#include <stack>\r
-#include <vector>\r
-\r
-#include <tbb/parallel_for.h>\r
-\r
-namespace caspar { namespace core {\r
-\r
-struct audio_item\r
-{\r
- const void* tag;\r
- frame_transform transform;\r
- audio_buffer audio_data;\r
-};\r
- \r
-struct audio_mixer::implementation\r
-{\r
- std::stack<core::frame_transform> transform_stack_;\r
- std::map<const void*, core::frame_transform> prev_frame_transforms_;\r
- std::vector<audio_item> items_;\r
-\r
-public:\r
- implementation()\r
- {\r
- transform_stack_.push(core::frame_transform());\r
- }\r
- \r
- void begin(core::basic_frame& frame)\r
- {\r
- transform_stack_.push(transform_stack_.top()*frame.get_frame_transform());\r
- }\r
-\r
- void visit(core::write_frame& frame)\r
- {\r
- if(transform_stack_.top().volume < 0.002 || frame.audio_data().empty())\r
- return;\r
-\r
- audio_item item;\r
- item.tag = frame.tag();\r
- item.transform = transform_stack_.top();\r
- 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
-\r
- items_.push_back(item); \r
- }\r
-\r
- void begin(const core::frame_transform& transform)\r
- {\r
- transform_stack_.push(transform_stack_.top()*transform);\r
- }\r
- \r
- void end()\r
- {\r
- transform_stack_.pop();\r
- }\r
- \r
- audio_buffer mix(const video_format_desc& format_desc)\r
- { \r
- CASPAR_ASSERT(format_desc.audio_channels == 2);\r
- CASPAR_ASSERT(format_desc.audio_samples_per_frame % 4 == 0);\r
-\r
- // NOTE: auto data should be larger than format_desc_.audio_samples_per_frame to allow sse to read/write beyond size.\r
-\r
- auto intermediate = std::vector<float, tbb::cache_aligned_allocator<float>>(format_desc.audio_samples_per_frame+128, 0.0f);\r
- auto result = audio_buffer(format_desc.audio_samples_per_frame+128); \r
- auto result_128 = reinterpret_cast<__m128i*>(result.data());\r
-\r
- std::map<const void*, core::frame_transform> next_frame_transforms;\r
- \r
- BOOST_FOREACH(auto& item, items_)\r
- { \r
- auto next = item.transform;\r
- auto prev = next;\r
-\r
- const auto it = prev_frame_transforms_.find(item.tag);\r
- if(it != prev_frame_transforms_.end())\r
- prev = it->second;\r
- \r
- next_frame_transforms[item.tag] = next; // Store all active tags, inactive tags will be removed at the end.\r
- \r
- if(prev.volume < 0.001 && next.volume < 0.001)\r
- continue;\r
-\r
- const float prev_volume = static_cast<float>(prev.volume);\r
- const float next_volume = static_cast<float>(next.volume);\r
- \r
- auto alpha = (next_volume-prev_volume)/static_cast<float>(format_desc.audio_samples_per_frame/format_desc.audio_channels);\r
- auto alpha_ps = _mm_set_ps1(alpha*2.0f);\r
- auto volume_ps = _mm_setr_ps(prev_volume, prev_volume, prev_volume+alpha, prev_volume+alpha);\r
-\r
- if(&item != &items_.back())\r
- {\r
- for(size_t n = 0; n < format_desc.audio_samples_per_frame/4; ++n)\r
- { \r
- auto sample_ps = _mm_cvtepi32_ps(_mm_load_si128(reinterpret_cast<__m128i*>(&item.audio_data[n*4])));\r
- auto res_sample_ps = _mm_load_ps(&intermediate[n*4]); \r
- sample_ps = _mm_mul_ps(sample_ps, volume_ps); \r
- res_sample_ps = _mm_add_ps(sample_ps, res_sample_ps); \r
-\r
- volume_ps = _mm_add_ps(volume_ps, alpha_ps);\r
-\r
- _mm_store_ps(&intermediate[n*4], res_sample_ps);\r
- }\r
- }\r
- else\r
- {\r
- for(size_t n = 0; n < format_desc.audio_samples_per_frame/4; ++n)\r
- { \r
- auto sample_ps = _mm_cvtepi32_ps(_mm_load_si128(reinterpret_cast<__m128i*>(&item.audio_data[n*4])));\r
- auto res_sample_ps = _mm_load_ps(&intermediate[n*4]); \r
- sample_ps = _mm_mul_ps(sample_ps, volume_ps); \r
- res_sample_ps = _mm_add_ps(sample_ps, res_sample_ps); \r
- \r
- _mm_stream_si128(result_128++, _mm_cvtps_epi32(res_sample_ps));\r
- }\r
- }\r
- } \r
-\r
- items_.clear();\r
- prev_frame_transforms_ = std::move(next_frame_transforms); \r
-\r
- result.resize(format_desc.audio_samples_per_frame);\r
- return std::move(result);\r
- }\r
-};\r
-\r
-audio_mixer::audio_mixer() : impl_(new implementation()){}\r
-void audio_mixer::begin(core::basic_frame& frame){impl_->begin(frame);}\r
-void audio_mixer::visit(core::write_frame& frame){impl_->visit(frame);}\r
-void audio_mixer::end(){impl_->end();}\r
-audio_buffer audio_mixer::mix(const video_format_desc& format_desc){return impl_->mix(format_desc);}\r
-audio_mixer& audio_mixer::operator=(audio_mixer&& other)\r
-{\r
- impl_ = std::move(other.impl_);\r
- return *this;\r
-}\r
-\r
+/*
+* Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
+*
+* This file is part of CasparCG (www.casparcg.com).
+*
+* CasparCG is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* CasparCG is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
+*
+* Author: Robert Nagy, ronag89@gmail.com
+*/
+
+#include "../../stdafx.h"
+
+#include "audio_mixer.h"
+
+#include <core/frame/frame.h>
+#include <core/frame/frame_transform.h>
+#include <common/diagnostics/graph.h>
+
+#include <boost/range/adaptors.hpp>
+#include <boost/range/distance.hpp>
+
+#include <map>
+#include <stack>
+#include <vector>
+
+namespace caspar { namespace core {
+
+struct audio_item
+{
+ const void* tag;
+ audio_transform transform;
+ audio_buffer audio_data;
+
+ audio_item()
+ {
+ }
+
+ audio_item(audio_item&& other)
+ : tag(std::move(other.tag))
+ , transform(std::move(other.transform))
+ , audio_data(std::move(other.audio_data))
+ {
+ }
+};
+
+typedef std::vector<float, tbb::cache_aligned_allocator<float>> audio_buffer_ps;
+
+struct audio_stream
+{
+ audio_transform prev_transform;
+ audio_buffer_ps audio_data;
+ bool is_still;
+
+ audio_stream()
+ : is_still(false)
+ {
+ }
+};
+
+struct audio_mixer::impl : boost::noncopyable
+{
+ std::stack<core::audio_transform> transform_stack_;
+ std::map<const void*, audio_stream> audio_streams_;
+ std::vector<audio_item> items_;
+ std::vector<int> audio_cadence_;
+ video_format_desc format_desc_;
+
+public:
+ impl()
+ {
+ transform_stack_.push(core::audio_transform());
+ }
+
+ void push(const frame_transform& transform)
+ {
+ transform_stack_.push(transform_stack_.top()*transform.audio_transform);
+ }
+
+ void visit(const const_frame& frame)
+ {
+ if(transform_stack_.top().volume < 0.002 || frame.audio_data().empty())
+ return;
+
+ audio_item item;
+ item.tag = frame.stream_tag();
+ item.transform = transform_stack_.top();
+ item.audio_data = frame.audio_data();
+
+ if(item.transform.is_still)
+ item.transform.volume = 0.0;
+
+ items_.push_back(std::move(item));
+ }
+
+ void begin(const core::audio_transform& transform)
+ {
+ transform_stack_.push(transform_stack_.top()*transform);
+ }
+
+ void pop()
+ {
+ transform_stack_.pop();
+ }
+
+ audio_buffer mix(const video_format_desc& format_desc)
+ {
+ if(format_desc_ != format_desc)
+ {
+ audio_streams_.clear();
+ audio_cadence_ = format_desc.audio_cadence;
+ format_desc_ = format_desc;
+ }
+
+ std::map<const void*, audio_stream> next_audio_streams;
+ std::vector<const void*> used_tags;
+
+ BOOST_FOREACH(auto& item, items_)
+ {
+ audio_buffer_ps next_audio;
+
+ auto next_transform = item.transform;
+ auto prev_transform = next_transform;
+
+ auto tag = item.tag;
+
+ if(boost::range::find(used_tags, tag) != used_tags.end())
+ continue;
+
+ used_tags.push_back(tag);
+
+ const auto it = audio_streams_.find(tag);
+ if(it != audio_streams_.end())
+ {
+ prev_transform = it->second.prev_transform;
+ next_audio = std::move(it->second.audio_data);
+ }
+
+ // Skip it if there is no existing audio stream and item has no audio-data.
+ if(it == audio_streams_.end() && item.audio_data.empty())
+ continue;
+
+ const float prev_volume = static_cast<float>(prev_transform.volume);
+ const float next_volume = static_cast<float>(next_transform.volume);
+
+ // TODO: Move volume mixing into code below, in order to support audio sample counts not corresponding to frame audio samples.
+ auto alpha = (next_volume-prev_volume)/static_cast<float>(item.audio_data.size()/format_desc.audio_channels);
+
+ for(size_t n = 0; n < item.audio_data.size(); ++n)
+ next_audio.push_back(item.audio_data[n] * (prev_volume + (n/format_desc_.audio_channels) * alpha));
+
+ next_audio_streams[tag].prev_transform = std::move(next_transform); // Store all active tags, inactive tags will be removed at the end.
+ next_audio_streams[tag].audio_data = std::move(next_audio);
+ next_audio_streams[tag].is_still = item.transform.is_still;
+ }
+
+ items_.clear();
+
+ audio_streams_ = std::move(next_audio_streams);
+
+ if(audio_streams_.empty())
+ audio_streams_[nullptr].audio_data = audio_buffer_ps(audio_cadence_.front(), 0.0f);
+
+ std::vector<float> result_ps(audio_cadence_.front(), 0.0f);
+ BOOST_FOREACH(auto& stream, audio_streams_ | boost::adaptors::map_values)
+ {
+ if(stream.audio_data.size() < result_ps.size())
+ stream.audio_data.resize(result_ps.size(), 0.0f);
+
+ auto out = boost::range::transform(result_ps, stream.audio_data, std::begin(result_ps), std::plus<float>());
+ stream.audio_data.erase(std::begin(stream.audio_data), std::begin(stream.audio_data) + std::distance(std::begin(result_ps), out));
+ }
+
+ boost::range::rotate(audio_cadence_, std::begin(audio_cadence_)+1);
+
+ audio_buffer result;
+ result.reserve(result_ps.size());
+ boost::range::transform(result_ps, std::back_inserter(result), [](float sample){return static_cast<int32_t>(sample);});
+
+ return result;
+ }
+};
+
+audio_mixer::audio_mixer() : impl_(new impl()){}
+void audio_mixer::push(const frame_transform& transform){impl_->push(transform);}
+void audio_mixer::visit(const const_frame& frame){impl_->visit(frame);}
+void audio_mixer::pop(){impl_->pop();}
+audio_buffer audio_mixer::operator()(const video_format_desc& format_desc){return impl_->mix(format_desc);}
+
}}
\ No newline at end of file
projects / casparcg / blobdiff