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Tracker.cpp
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Tracker.cpp
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/**
* @file
* @brief Source file for Tracker effect class
* @author Jonathan Thomas <jonathan@openshot.org>
* @author Brenno Caldato <brenno.caldato@outlook.com>
*
* @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 "effects/Tracker.h"
#include "Exceptions.h"
#include <google/protobuf/util/time_util.h>
#include "Timeline.h"
#include <QImage>
#include <QPainter>
#include <QRectF>
using namespace std;
using namespace openshot;
using google::protobuf::util::TimeUtil;
/// Blank constructor, useful when using Json to load the effect properties
Tracker::Tracker(std::string clipTrackerDataPath)
{
// Init effect properties
init_effect_details();
// Instantiate a TrackedObjectBBox object and point to it
TrackedObjectBBox trackedDataObject;
trackedData = std::make_shared<TrackedObjectBBox>(trackedDataObject);
// Tries to load the tracked object's data from protobuf file
trackedData->LoadBoxData(clipTrackerDataPath);
ClipBase* parentClip = this->ParentClip();
trackedData->ParentClip(parentClip);
// Insert TrackedObject with index 0 to the trackedObjects map
trackedObjects.insert({0, trackedData});
}
// Default constructor
Tracker::Tracker()
{
// Init effect properties
init_effect_details();
// Instantiate a TrackedObjectBBox object and point to it
TrackedObjectBBox trackedDataObject;
trackedData = std::make_shared<TrackedObjectBBox>(trackedDataObject);
ClipBase* parentClip = this->ParentClip();
trackedData->ParentClip(parentClip);
// Insert TrackedObject with index 0 to the trackedObjects map
trackedObjects.insert({0, trackedData});
}
// Init effect settings
void Tracker::init_effect_details()
{
/// Initialize the values of the EffectInfo struct.
InitEffectInfo();
/// Set the effect info
info.class_name = "Tracker";
info.name = "Tracker";
info.description = "Track the selected bounding box through the video.";
info.has_audio = false;
info.has_video = true;
info.has_tracked_object = true;
this->TimeScale = 1.0;
}
// This method is required for all derived classes of EffectBase, and returns a
// modified openshot::Frame object
std::shared_ptr<Frame> Tracker::GetFrame(std::shared_ptr<Frame> frame, int64_t frame_number)
{
// Get the frame's image
cv::Mat frame_image = frame->GetImageCV();
// Initialize the Qt rectangle that will hold the positions of the bounding-box
QRectF boxRect;
// Initialize the image of the TrackedObject child clip
std::shared_ptr<QImage> childClipImage = nullptr;
// Check if frame isn't NULL
if(!frame_image.empty() &&
trackedData->Contains(frame_number) &&
trackedData->visible.GetValue(frame_number) == 1)
{
// Get the width and height of the image
float fw = frame_image.size().width;
float fh = frame_image.size().height;
// Get the bounding-box of given frame
BBox fd = trackedData->GetBox(frame_number);
// Check if track data exists for the requested frame
if (trackedData->draw_box.GetValue(frame_number) == 1)
{
std::vector<int> stroke_rgba = trackedData->stroke.GetColorRGBA(frame_number);
int stroke_width = trackedData->stroke_width.GetValue(frame_number);
float stroke_alpha = trackedData->stroke_alpha.GetValue(frame_number);
std::vector<int> bg_rgba = trackedData->background.GetColorRGBA(frame_number);
float bg_alpha = trackedData->background_alpha.GetValue(frame_number);
// Create a rotated rectangle object that holds the bounding box
cv::RotatedRect box ( cv::Point2f( (int)(fd.cx*fw), (int)(fd.cy*fh) ),
cv::Size2f( (int)(fd.width*fw), (int)(fd.height*fh) ),
(int) (fd.angle) );
DrawRectangleRGBA(frame_image, box, bg_rgba, bg_alpha, 1, true);
DrawRectangleRGBA(frame_image, box, stroke_rgba, stroke_alpha, stroke_width, false);
}
// Get the image of the Tracked Object' child clip
if (trackedData->ChildClipId() != ""){
// Cast the parent timeline of this effect
Timeline* parentTimeline = (Timeline *) ParentTimeline();
if (parentTimeline){
// Get the Tracked Object's child clip
Clip* childClip = parentTimeline->GetClip(trackedData->ChildClipId());
if (childClip){
// Get the image of the child clip for this frame
std::shared_ptr<Frame> f(new Frame(1, frame->GetWidth(), frame->GetHeight(), "#00000000"));
std::shared_ptr<Frame> childClipFrame = childClip->GetFrame(f, frame_number);
childClipImage = childClipFrame->GetImage();
// Set the Qt rectangle with the bounding-box properties
boxRect.setRect((int)((fd.cx-fd.width/2)*fw),
(int)((fd.cy - fd.height/2)*fh),
(int)(fd.width*fw),
(int)(fd.height*fh) );
}
}
}
}
// Set image with drawn box to frame
// If the input image is NULL or doesn't have tracking data, it's returned as it came
frame->SetImageCV(frame_image);
// Set the bounding-box image with the Tracked Object's child clip image
if (childClipImage){
// Get the frame image
QImage frameImage = *(frame->GetImage());
// Set a Qt painter to the frame image
QPainter painter(&frameImage);
// Draw the child clip image inside the bounding-box
painter.drawImage(boxRect, *childClipImage, QRectF(0, 0, frameImage.size().width(), frameImage.size().height()));
// Set the frame image as the composed image
frame->AddImage(std::make_shared<QImage>(frameImage));
}
return frame;
}
void Tracker::DrawRectangleRGBA(cv::Mat &frame_image, cv::RotatedRect box, std::vector<int> color, float alpha, int thickness, bool is_background){
// Get the bouding box vertices
cv::Point2f vertices2f[4];
box.points(vertices2f);
// TODO: take a rectangle of frame_image by refencence and draw on top of that to improve speed
// select min enclosing rectangle to draw on a small portion of the image
// cv::Rect rect = box.boundingRect();
// cv::Mat image = frame_image(rect)
if(is_background){
cv::Mat overlayFrame;
frame_image.copyTo(overlayFrame);
// draw bounding box background
cv::Point vertices[4];
for(int i = 0; i < 4; ++i){
vertices[i] = vertices2f[i];}
cv::Rect rect = box.boundingRect();
cv::fillConvexPoly(overlayFrame, vertices, 4, cv::Scalar(color[2],color[1],color[0]), cv::LINE_AA);
// add opacity
cv::addWeighted(overlayFrame, 1-alpha, frame_image, alpha, 0, frame_image);
}
else{
cv::Mat overlayFrame;
frame_image.copyTo(overlayFrame);
// Draw bounding box
for (int i = 0; i < 4; i++)
{
cv::line(overlayFrame, vertices2f[i], vertices2f[(i+1)%4], cv::Scalar(color[2],color[1],color[0]),
thickness, cv::LINE_AA);
}
// add opacity
cv::addWeighted(overlayFrame, 1-alpha, frame_image, alpha, 0, frame_image);
}
}
// Get the indexes and IDs of all visible objects in the given frame
std::string Tracker::GetVisibleObjects(int64_t frame_number) const{
// Initialize the JSON objects
Json::Value root;
root["visible_objects_index"] = Json::Value(Json::arrayValue);
root["visible_objects_id"] = Json::Value(Json::arrayValue);
// Iterate through the tracked objects
for (const auto& trackedObject : trackedObjects){
// Get the tracked object JSON properties for this frame
Json::Value trackedObjectJSON = trackedObject.second->PropertiesJSON(frame_number);
if (trackedObjectJSON["visible"]["value"].asBool()){
// Save the object's index and ID if it's visible in this frame
root["visible_objects_index"].append(trackedObject.first);
root["visible_objects_id"].append(trackedObject.second->Id());
}
}
return root.toStyledString();
}
// Generate JSON string of this object
std::string Tracker::Json() const {
// Return formatted string
return JsonValue().toStyledString();
}
// Generate Json::Value for this object
Json::Value Tracker::JsonValue() const {
// Create root json object
Json::Value root = EffectBase::JsonValue(); // get parent properties
// Save the effect's properties on root
root["type"] = info.class_name;
root["protobuf_data_path"] = protobuf_data_path;
root["BaseFPS"]["num"] = BaseFPS.num;
root["BaseFPS"]["den"] = BaseFPS.den;
root["TimeScale"] = this->TimeScale;
root["objects_id"] = Json::Value(Json::arrayValue);
// Add trackedObjects IDs to JSON
for (auto const& trackedObject : trackedObjects){
// Get the trackedObject JSON
Json::Value trackedObjectJSON = trackedObject.second->JsonValue();
root["objects_id"].append(trackedObject.second->Id());
// Save the trackedObject JSON on root
for (auto const& key : trackedObjectJSON.getMemberNames())
root[key] = trackedObjectJSON[key];
}
// return JsonValue
return root;
}
// Load JSON string into this object
void Tracker::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)");
}
return;
}
// Load Json::Value into this object
void Tracker::SetJsonValue(const Json::Value root) {
// Set parent data
EffectBase::SetJsonValue(root);
if(!root["type"].isNull())
info.class_name = root["type"].asString();
if (!root["BaseFPS"].isNull() && root["BaseFPS"].isObject())
{
if (!root["BaseFPS"]["num"].isNull())
{
BaseFPS.num = (int) root["BaseFPS"]["num"].asInt();
}
if (!root["BaseFPS"]["den"].isNull())
{
BaseFPS.den = (int) root["BaseFPS"]["den"].asInt();
}
}
if (!root["TimeScale"].isNull())
TimeScale = (double) root["TimeScale"].asDouble();
// Set data from Json (if key is found)
if (!root["protobuf_data_path"].isNull() && protobuf_data_path.size() <= 1)
{
protobuf_data_path = root["protobuf_data_path"].asString();
if(!trackedData->LoadBoxData(protobuf_data_path))
{
std::cout<<"Invalid protobuf data path";
protobuf_data_path = "";
}
}
// Set the tracked object's properties
for (auto const& trackedObject : trackedObjects){
Json::Value trackedObjectJSON = root;
if (!root["objects_id"].isNull())
trackedObjectJSON["box_id"] = root["objects_id"][trackedObject.first].asString();
trackedObject.second->SetJsonValue(trackedObjectJSON);
}
return;
}
// Get all properties for a specific frame
std::string Tracker::PropertiesJSON(int64_t requested_frame) const {
// Generate JSON properties list
Json::Value root;
// Add trackedObject properties to JSON
for (auto const& trackedObject : trackedObjects)
root = trackedObject.second->PropertiesJSON(requested_frame);
// Append effect's properties
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, 1000 * 60 * 30, 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, 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);
// Return formatted string
return root.toStyledString();
}