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Deinterlace.cpp
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Deinterlace.cpp
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/**
* @file
* @brief Source file for De-interlace class
* @author Jonathan Thomas <jonathan@openshot.org>
*
* @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 "../../include/effects/Deinterlace.h"
using namespace openshot;
/// Blank constructor, useful when using Json to load the effect properties
Deinterlace::Deinterlace() : isOdd(true)
{
// Init effect properties
init_effect_details();
}
// Default constructor
Deinterlace::Deinterlace(bool UseOddLines) : isOdd(UseOddLines)
{
// Init effect properties
init_effect_details();
}
// Init effect settings
void Deinterlace::init_effect_details()
{
/// Initialize the values of the EffectInfo struct.
InitEffectInfo();
/// Set the effect info
info.class_name = "Deinterlace";
info.name = "Deinterlace";
info.description = "Remove interlacing from a video (i.e. even or odd horizontal lines)";
info.has_audio = false;
info.has_video = true;
}
// This method is required for all derived classes of EffectBase, and returns a
// modified openshot::Frame object
std::shared_ptr<Frame> Deinterlace::GetFrame(std::shared_ptr<Frame> frame, int64_t frame_number)
{
// Get original size of frame's image
int original_width = frame->GetImage()->width();
int original_height = frame->GetImage()->height();
// Get the frame's image
std::shared_ptr<QImage> image = frame->GetImage();
const unsigned char* pixels = image->bits();
// Create a smaller, new image
QImage deinterlaced_image(image->width(), image->height() / 2, QImage::Format_ARGB32_Premultiplied);
const unsigned char* deinterlaced_pixels = deinterlaced_image.bits();
// Loop through the scanlines of the image (even or odd)
int start = 0;
if (isOdd)
start = 1;
for (int row = start; row < image->height(); row += 2) {
memcpy((unsigned char*)deinterlaced_pixels, pixels + (row * image->bytesPerLine()), image->bytesPerLine());
deinterlaced_pixels += image->bytesPerLine();
}
// Resize deinterlaced image back to original size, and update frame's image
image = std::make_shared<QImage>(deinterlaced_image.scaled(
original_width, original_height,
Qt::IgnoreAspectRatio, Qt::FastTransformation));
// Update image on frame
frame->AddImage(image);
// return the modified frame
return frame;
}
// Generate JSON string of this object
std::string Deinterlace::Json() const {
// Return formatted string
return JsonValue().toStyledString();
}
// Generate Json::Value for this object
Json::Value Deinterlace::JsonValue() const {
// Create root json object
Json::Value root = EffectBase::JsonValue(); // get parent properties
root["type"] = info.class_name;
root["isOdd"] = isOdd;
// return JsonValue
return root;
}
// Load JSON string into this object
void Deinterlace::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 Deinterlace::SetJsonValue(const Json::Value root) {
// Set parent data
EffectBase::SetJsonValue(root);
// Set data from Json (if key is found)
if (!root["isOdd"].isNull())
isOdd = root["isOdd"].asBool();
}
// Get all properties for a specific frame
std::string Deinterlace::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["position"] = add_property_json("Position", Position(), "float", "", NULL, 0, 30 * 60 * 60 * 48, false, 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, 30 * 60 * 60 * 48, false, requested_frame);
root["end"] = add_property_json("End", End(), "float", "", NULL, 0, 30 * 60 * 60 * 48, false, requested_frame);
root["duration"] = add_property_json("Duration", Duration(), "float", "", NULL, 0, 30 * 60 * 60 * 48, true, requested_frame);
root["isOdd"] = add_property_json("Is Odd Frame", isOdd, "bool", "", NULL, 0, 1, true, requested_frame);
// Add Is Odd Frame choices (dropdown style)
root["isOdd"]["choices"].append(add_property_choice_json("Yes", true, isOdd));
root["isOdd"]["choices"].append(add_property_choice_json("No", false, isOdd));
// Return formatted string
return root.toStyledString();
}