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100 lines
2.5 KiB
C++
100 lines
2.5 KiB
C++
#include "../include/ImageReader.h"
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using namespace openshot;
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ImageReader::ImageReader(string path) throw(InvalidFile) : path(path), is_open(false)
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{
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// Init FileInfo struct (clear all values)
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InitFileInfo();
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// Open and Close the reader, to populate it's attributes (such as height, width, etc...)
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Open();
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Close();
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}
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// Open image file
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void ImageReader::Open() throw(InvalidFile)
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{
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// Open reader if not already open
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if (!is_open)
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{
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// Attempt to open file
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try
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{
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// load image
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image = tr1::shared_ptr<Magick::Image>(new Magick::Image(path));
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// Give image a transparent background color
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image->backgroundColor(Magick::Color("none"));
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}
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catch (Magick::Exception e) {
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// raise exception
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throw InvalidFile("File could not be opened.", path);
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}
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// Update image properties
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info.has_audio = false;
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info.has_video = true;
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info.file_size = image->fileSize();
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info.vcodec = image->format();
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info.width = image->size().width();
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info.height = image->size().height();
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info.pixel_ratio.num = 1;
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info.pixel_ratio.den = 1;
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info.duration = 60 * 60 * 24; // 24 hour duration
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info.fps.num = 30;
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info.fps.den = 1;
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info.video_timebase.num = 1;
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info.video_timebase.den = 30;
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info.video_length = round(info.duration * info.fps.ToDouble());
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// Calculate the DAR (display aspect ratio)
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Fraction size(info.width * info.pixel_ratio.num, info.height * info.pixel_ratio.den);
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// Reduce size fraction
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size.Reduce();
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// Set the ratio based on the reduced fraction
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info.display_ratio.num = size.num;
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info.display_ratio.den = size.den;
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// Mark as "open"
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is_open = true;
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}
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}
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// Close image file
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void ImageReader::Close()
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{
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// Close all objects, if reader is 'open'
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if (is_open)
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{
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// Mark as "closed"
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is_open = false;
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}
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}
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// Get an openshot::Frame object for a specific frame number of this reader.
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tr1::shared_ptr<Frame> ImageReader::GetFrame(int requested_frame) throw(ReaderClosed)
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{
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if (image)
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{
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// Create or get frame object
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tr1::shared_ptr<Frame> image_frame(new Frame(requested_frame, image->size().width(), image->size().height(), "#000000", 0, 2));
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image_frame->SetSampleRate(44100);
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// Add Image data to frame
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tr1::shared_ptr<Magick::Image> copy_image(new Magick::Image(*image.get()));
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copy_image->modifyImage(); // actually copy the image data to this object
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image_frame->AddImage(copy_image);
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// return frame object
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return image_frame;
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}
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else
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// no frame loaded
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throw InvalidFile("No frame could be created from this type of file.", path);
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}
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