libopenshot/src/Clip.cpp

#include "../include/Clip.h"

using namespace openshot;

// Init default settings for a clip
void Clip::init_settings()
{
	// Init clip settings
	Position(0.0);
	Layer(0);
	Start(0.0);
	End(0.0);
	gravity = GRAVITY_CENTER;
	scale = SCALE_FIT;
	anchor = ANCHOR_CANVAS;

	// Init scale curves
	scale_x = Keyframe(100.0);
	scale_y = Keyframe(100.0);

	// Init location curves
	location_x = Keyframe(0.0);
	location_y = Keyframe(0.0);

	// Init alpha & rotation
	alpha = Keyframe(100.0);
	rotation = Keyframe(0.0);

	// Init time & volume
	time = Keyframe(0.0);
	volume = Keyframe(100.0);

	// Init crop settings
	crop_gravity = GRAVITY_CENTER;
	crop_width = Keyframe(-1.0);
	crop_height = Keyframe(-1.0);
	crop_x = Keyframe(0.0);
	crop_y = Keyframe(0.0);

	// Init shear and perspective curves
	shear_x = Keyframe(0.0);
	shear_y = Keyframe(0.0);
	perspective_c1_x = Keyframe(-1.0);
	perspective_c1_y = Keyframe(-1.0);
	perspective_c2_x = Keyframe(-1.0);
	perspective_c2_y = Keyframe(-1.0);
	perspective_c3_x = Keyframe(-1.0);
	perspective_c3_y = Keyframe(-1.0);
	perspective_c4_x = Keyframe(-1.0);
	perspective_c4_y = Keyframe(-1.0);

	// Default pointers
	frame_map = NULL;
	file_reader = NULL;
}

// Default Constructor for a clip
Clip::Clip()
{
	// Init all default settings
	init_settings();
}

// Constructor with filepath
Clip::Clip(string path)
{
	// Init all default settings
	init_settings();

	// Get file extension (and convert to lower case)
	string ext = get_file_extension(path);
	transform(ext.begin(), ext.end(), ext.begin(), ::tolower);

	// Determine if common video formats
	if (ext=="avi" || ext=="mov" || ext=="mpg" || ext=="mpeg" || ext=="mp3" || ext=="mp4" || ext=="mts" || ext=="ogg" || ext=="wmv" || ext=="webm" || ext=="vob")
	{
		try
		{
			// Open common video format
			file_reader = new FFmpegReader(path);
			cout << "READER FOUND: FFmpegReader" << endl;
		} catch(...) { }
	}

	// If no video found, try each reader
	if (!file_reader)
	{
		try
		{
			// Try an image reader
			file_reader = new ImageReader(path);
			cout << "READER FOUND: ImageReader" << endl;

		} catch(...) {
			try
			{
				// Try a video reader
				file_reader = new FFmpegReader(path);
				cout << "READER FOUND: FFmpegReader" << endl;

			} catch(BaseException ex) {
				// No Reader Found, Throw an exception
				cout << "READER NOT FOUND" << endl;
				throw ex;
			}
		}
	}

	// Set some clip properties from the file reader
	End(file_reader->info.duration);
}

// Map frame rate of this clip to a different frame rate
void Clip::MapFrames(Framerate fps, Pulldown_Method pulldown)
{
	// Check for a valid file reader (required to re-map it's frame rate)
	if (file_reader)
	{
		// Get original framerate
		Framerate original_fps(file_reader->info.fps.num, file_reader->info.fps.den);

		// Create and Set FrameMapper object
		frame_map = new FrameMapper(file_reader->info.video_length, original_fps, fps, pulldown);
	}
}

// Get file extension
string Clip::get_file_extension(string path)
{
	// return last part of path
	return path.substr(path.find_last_of(".") + 1);
}