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126 lines
3.8 KiB
C++
126 lines
3.8 KiB
C++
/**
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* @file
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* @brief Source file for De-interlace class
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* @author Jonathan Thomas <jonathan@openshot.org>
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*
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* @section LICENSE
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*
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* Copyright (c) 2008-2014 OpenShot Studios, LLC
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* <http://www.openshotstudios.com/>. This file is part of
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* OpenShot Library (libopenshot), an open-source project dedicated to
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* delivering high quality video editing and animation solutions to the
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* world. For more information visit <http://www.openshot.org/>.
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*
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* OpenShot Library (libopenshot) is free software: you can redistribute it
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* and/or modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* OpenShot Library (libopenshot) is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "../../include/effects/Deinterlace.h"
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using namespace openshot;
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/// Blank constructor, useful when using Json to load the effect properties
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Deinterlace::Deinterlace() : isOdd(true) {
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}
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// Default constructor
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Deinterlace::Deinterlace(bool UseOddLines) : isOdd(UseOddLines)
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{
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/// Initialize the values of the EffectInfo struct.
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InitEffectInfo();
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/// Set the effect info
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info.name = "Deinterlace";
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info.description = "Remove interlacing from a video (i.e. even or odd horizontal lines)";
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info.has_audio = false;
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info.has_video = true;
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}
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// This method is required for all derived classes of EffectBase, and returns a
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// modified openshot::Frame object
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tr1::shared_ptr<Frame> Deinterlace::GetFrame(tr1::shared_ptr<Frame> frame, int frame_number)
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{
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// Calculate the new size (used to shrink and expand the image, to remove interlacing)
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Magick::Geometry original_size = frame->GetImage()->size();
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Magick::Geometry frame_size = frame->GetImage()->size();
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frame_size.aspect(false); // allow the image to be re-sized to an invalid aspect ratio
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frame_size.height(frame_size.height() / 2.0); // height set to 50% of original height
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if (isOdd)
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// Roll the image by 1 pixel, to use the ODD horizontal lines (instead of the even ones)
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frame->GetImage()->roll(0,1);
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// Resample the image to 50% height (to remove every other line)
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frame->GetImage()->sample(frame_size);
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// Resize image back to original height
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frame->GetImage()->resize(original_size);
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// return the modified frame
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return frame;
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}
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// Generate JSON string of this object
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string Deinterlace::Json() {
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// Return formatted string
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return JsonValue().toStyledString();
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}
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// Generate Json::JsonValue for this object
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Json::Value Deinterlace::JsonValue() {
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// Create root json object
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Json::Value root = EffectBase::JsonValue(); // get parent properties
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root["type"] = "Deinterlace";
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root["isOdd"] = isOdd;
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// return JsonValue
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return root;
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}
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// Load JSON string into this object
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void Deinterlace::SetJson(string value) throw(InvalidJSON) {
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// Parse JSON string into JSON objects
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Json::Value root;
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Json::Reader reader;
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bool success = reader.parse( value, root );
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if (!success)
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// Raise exception
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throw InvalidJSON("JSON could not be parsed (or is invalid)", "");
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try
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{
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// Set all values that match
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SetJsonValue(root);
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}
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catch (exception e)
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{
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// Error parsing JSON (or missing keys)
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throw InvalidJSON("JSON is invalid (missing keys or invalid data types)", "");
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}
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}
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// Load Json::JsonValue into this object
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void Deinterlace::SetJsonValue(Json::Value root) {
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// Set parent data
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EffectBase::SetJsonValue(root);
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// Set data from Json (if key is found)
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if (!root["isOdd"].isNull())
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isOdd = root["isOdd"].asBool();
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}
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