X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=core%2Fmixer%2Faudio%2Faudio_mixer.cpp;h=a1c233863bb763bc1bbbf0212af2b7e0ad9e5845;hb=0a0753380eefc7aa64561308ad02564735262ae9;hp=2c7453371a0c7ad34980299cd108e40610600ce3;hpb=a632a63ad64f8319422af23a9baacb73e42888e4;p=casparcg diff --git a/core/mixer/audio/audio_mixer.cpp b/core/mixer/audio/audio_mixer.cpp index 2c7453371..a1c233863 100644 --- a/core/mixer/audio/audio_mixer.cpp +++ b/core/mixer/audio/audio_mixer.cpp @@ -1,200 +1,223 @@ -/* -* Copyright (c) 2011 Sveriges Television AB -* -* 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 . -* -* Author: Robert Nagy, ronag89@gmail.com -*/ - -#include "../../stdafx.h" - -#include "audio_mixer.h" - -#include -#include -#include - -#include -#include - -#include -#include -#include - -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> 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 transform_stack_; - std::map audio_streams_; - std::vector items_; - std::vector 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 next_audio_streams; - std::vector 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(prev_transform.volume); - const float next_volume = static_cast(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(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 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()); - 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(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 +/* +* Copyright (c) 2011 Sveriges Television AB +* +* 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 . +* +* Author: Robert Nagy, ronag89@gmail.com +*/ + +#include "../../StdAfx.h" + +#include "audio_mixer.h" + +#include +#include +#include +#include + +#include +#include + +#include +#include +#include + +namespace caspar { namespace core { + +struct audio_item +{ + const void* tag = nullptr; + 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 cache_aligned_vector audio_buffer_ps; + +struct audio_stream +{ + audio_transform prev_transform; + audio_buffer_ps audio_data; + bool is_still = false; +}; + +struct audio_mixer::impl : boost::noncopyable +{ + std::stack transform_stack_; + std::map audio_streams_; + std::vector items_; + std::vector audio_cadence_; + video_format_desc format_desc_; + float master_volume_ = 1.0f; + float previous_master_volume_ = master_volume_; +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(); + } + + void set_master_volume(float volume) + { + master_volume_ = volume; + } + + 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 next_audio_streams; + std::vector used_tags; + + for (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(prev_transform.volume) * previous_master_volume_; + const float next_volume = static_cast(next_transform.volume) * master_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(item.audio_data.size()/format_desc.audio_channels); + + for(size_t n = 0; n < item.audio_data.size(); ++n) + { + auto sample_multiplier = (prev_volume + (n/format_desc_.audio_channels) * alpha); + next_audio.push_back(item.audio_data[n] * sample_multiplier); + } + + 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; + } + + previous_master_volume_ = master_volume_; + items_.clear(); + + audio_streams_ = std::move(next_audio_streams); + + if(audio_streams_.empty()) + audio_streams_[nullptr].audio_data = audio_buffer_ps(audio_size(audio_cadence_.front()), 0.0f); + + { // sanity check + + auto nb_invalid_streams = cpplinq::from(audio_streams_) + .select(values()) + .where([&](const audio_stream& x) { return x.audio_data.size() < audio_size(audio_cadence_.front()); }) + .count(); + + if(nb_invalid_streams > 0) + CASPAR_LOG(trace) << "[audio_mixer] Incorrect frame audio cadence detected."; + } + + std::vector result_ps(audio_size(audio_cadence_.front()), 0.0f); + for (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()); + 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(sample);}); + + return result; + } + + size_t audio_size(size_t num_samples) const + { + return num_samples * format_desc_.audio_channels; + } +}; + +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();} +void audio_mixer::set_master_volume(float volume) { impl_->set_master_volume(volume); } +audio_buffer audio_mixer::operator()(const video_format_desc& format_desc){return impl_->mix(format_desc);} + +}}