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Compressor.cpp
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Compressor.cpp
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/**
* @file
* @brief Source file for Compressor audio effect class
* @author
*
* @ref License
*/
/* LICENSE
*
* Copyright (c) 2008-2019 OpenShot Studios, LLC
* <http://www.openshotstudios.com/>. This file is part of
* OpenShot Library (libopenshot), an open-source project dedicated to
* delivering high quality video editing and animation solutions to the
* world. For more information visit <http://www.openshot.org/>.
*
* OpenShot Library (libopenshot) is free software: you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* OpenShot Library (libopenshot) 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Compressor.h"
#include "Exceptions.h"
using namespace openshot;
/// Blank constructor, useful when using Json to load the effect properties
Compressor::Compressor() : mode(COMPRESSOR), threshold(1), ratio(1), attack(1), release(1), makeup_gain(1), bypass(false) {
// Init effect properties
init_effect_details();
}
// Default constructor
Compressor::Compressor(openshot::CompressorMode new_mode, Keyframe new_threshold, Keyframe new_ratio, Keyframe new_attack, Keyframe new_release, Keyframe new_makeup_gain, Keyframe new_bypass) :
mode(new_mode), threshold(new_threshold), ratio(new_ratio), attack(new_attack), release(new_release), makeup_gain(new_makeup_gain), bypass(new_bypass)
{
// Init effect properties
init_effect_details();
}
// Init effect settings
void Compressor::init_effect_details()
{
/// Initialize the values of the EffectInfo struct.
InitEffectInfo();
/// Set the effect info
info.class_name = "Compressor";
info.name = "Compressor";
info.description = "Add compressor on the frame's sound.";
info.has_audio = true;
info.has_video = false;
input_level = 0.0f;
yl_prev = 0.0f;
}
// This method is required for all derived classes of EffectBase, and returns a
// modified openshot::Frame object
std::shared_ptr<openshot::Frame> Compressor::GetFrame(std::shared_ptr<openshot::Frame> frame, int64_t frame_number)
{
// Adding Compressor
const int num_input_channels = frame->audio->getNumChannels();
const int num_output_channels = frame->audio->getNumChannels();
const int num_samples = frame->audio->getNumSamples();
mixed_down_input.setSize(1, num_samples);
inverse_sample_rate = 1.0f / frame->SampleRate(); //(float)getSampleRate();
inverseE = 1.0f / M_E;
if ((bool)bypass.GetValue(frame_number))
return frame;
mixed_down_input.clear();
for (int channel = 0; channel < num_input_channels; ++channel)
mixed_down_input.addFrom(0, 0, *frame->audio, channel, 0, num_samples, 1.0f / num_input_channels);
for (int sample = 0; sample < num_samples; ++sample) {
bool expander = (bool)mode;
float T = threshold.GetValue(frame_number);
float R = ratio.GetValue(frame_number);
float alphaA = calculateAttackOrRelease(attack.GetValue(frame_number));
float alphaR = calculateAttackOrRelease(release.GetValue(frame_number));
float gain = makeup_gain.GetValue(frame_number);
float input_squared = powf(mixed_down_input.getSample(0, sample), 2.0f);
if (expander) {
const float average_factor = 0.9999f;
input_level = average_factor * input_level + (1.0f - average_factor) * input_squared;
} else {
input_level = input_squared;
}
xg = (input_level <= 1e-6f) ? -60.0f : 10.0f * log10f(input_level);
// Expander
if (expander) {
if (xg > T)
yg = xg;
else
yg = T + (xg - T) * R;
xl = xg - yg;
if (xl < yl_prev)
yl = alphaA * yl_prev + (1.0f - alphaA) * xl;
else
yl = alphaR * yl_prev + (1.0f - alphaR) * xl;
// Compressor
} else {
if (xg < T)
yg = xg;
else
yg = T + (xg - T) / R;
xl = xg - yg;
if (xl > yl_prev)
yl = alphaA * yl_prev + (1.0f - alphaA) * xl;
else
yl = alphaR * yl_prev + (1.0f - alphaR) * xl;
}
control = powf (10.0f, (gain - yl) * 0.05f);
yl_prev = yl;
for (int channel = 0; channel < num_input_channels; ++channel) {
float new_value = frame->audio->getSample(channel, sample)*control;
frame->audio->setSample(channel, sample, new_value);
}
}
for (int channel = num_input_channels; channel < num_output_channels; ++channel)
frame->audio->clear(channel, 0, num_samples);
// return the modified frame
return frame;
}
float Compressor::calculateAttackOrRelease(float value)
{
if (value == 0.0f)
return 0.0f;
else
return pow (inverseE, inverse_sample_rate / value);
}
// Generate JSON string of this object
std::string Compressor::Json() const {
// Return formatted string
return JsonValue().toStyledString();
}
// Generate Json::Value for this object
Json::Value Compressor::JsonValue() const {
// Create root json object
Json::Value root = EffectBase::JsonValue(); // get parent properties
root["type"] = info.class_name;
root["mode"] = mode;
root["threshold"] = threshold.JsonValue();
root["ratio"] = ratio.JsonValue();
root["attack"] = attack.JsonValue();
root["release"] = release.JsonValue();
root["makeup_gain"] = makeup_gain.JsonValue();
root["bypass"] = bypass.JsonValue();
// return JsonValue
return root;
}
// Load JSON string into this object
void Compressor::SetJson(const std::string value) {
// Parse JSON string into JSON objects
try
{
const Json::Value root = openshot::stringToJson(value);
// Set all values that match
SetJsonValue(root);
}
catch (const std::exception& e)
{
// Error parsing JSON (or missing keys)
throw InvalidJSON("JSON is invalid (missing keys or invalid data types)");
}
}
// Load Json::Value into this object
void Compressor::SetJsonValue(const Json::Value root) {
// Set parent data
EffectBase::SetJsonValue(root);
// Set data from Json (if key is found)
if (!root["mode"].isNull())
mode = (CompressorMode)root["mode"].asInt();
if (!root["threshold"].isNull())
threshold.SetJsonValue(root["threshold"]);
if (!root["ratio"].isNull())
ratio.SetJsonValue(root["ratio"]);
if (!root["attack"].isNull())
attack.SetJsonValue(root["attack"]);
if (!root["release"].isNull())
release.SetJsonValue(root["release"]);
if (!root["makeup_gain"].isNull())
makeup_gain.SetJsonValue(root["makeup_gain"]);
if (!root["bypass"].isNull())
bypass.SetJsonValue(root["bypass"]);
}
// Get all properties for a specific frame
std::string Compressor::PropertiesJSON(int64_t requested_frame) const {
// Generate JSON properties list
Json::Value root;
root["id"] = add_property_json("ID", 0.0, "string", Id(), NULL, -1, -1, true, requested_frame);
root["layer"] = add_property_json("Track", Layer(), "int", "", NULL, 0, 20, false, requested_frame);
root["start"] = add_property_json("Start", Start(), "float", "", NULL, 0, 1000 * 60 * 30, false, requested_frame);
root["end"] = add_property_json("End", End(), "float", "", NULL, 0, 1000 * 60 * 30, false, requested_frame);
root["duration"] = add_property_json("Duration", Duration(), "float", "", NULL, 0, 1000 * 60 * 30, true, requested_frame);
// Keyframes
root["mode"] = add_property_json("Mode", mode, "int", "", NULL, 0, 3, false, requested_frame);
root["threshold"] = add_property_json("Threshold (dB)", threshold.GetValue(requested_frame), "float", "", &threshold, -60, 60, false, requested_frame);
root["ratio"] = add_property_json("Ratio", ratio.GetValue(requested_frame), "float", "", &ratio, 1, 100, false, requested_frame);
root["attack"] = add_property_json("Attack", attack.GetValue(requested_frame), "float", "", &attack, 0.1, 100, false, requested_frame);
root["release"] = add_property_json("Release", release.GetValue(requested_frame), "float", "", &release, 10, 1000, false, requested_frame);
root["makeup_gain"] = add_property_json("Makeup gain", makeup_gain.GetValue(requested_frame), "float", "", &makeup_gain, -12, 12, false, requested_frame);
root["bypass"] = add_property_json("Bypass", bypass.GetValue(requested_frame), "bool", "", &bypass, 0, 1, false, requested_frame);
// Add mode choices (dropdown style)
root["mode"]["choices"].append(add_property_choice_json("Compressor", COMPRESSOR, mode));
root["mode"]["choices"].append(add_property_choice_json("Limiter", LIMITER, mode));
root["mode"]["choices"].append(add_property_choice_json("Expander", EXPANDER, mode));
root["mode"]["choices"].append(add_property_choice_json("Noise Gate", NOISE_GATE, mode));
// Return formatted string
return root.toStyledString();
}