// Constructor for DummyReader. Pass a framerate and samplerate.
DummyReader::DummyReader(Fraction fps, int width, int height, int sample_rate, int channels, float duration) {
// Set key info settings
info.has_audio = false;
info.has_video = true;
info.file_size = width * height * sizeof(int);
info.vcodec = "raw";
info.fps = fps;
info.width = width;
info.height = height;
info.sample_rate = sample_rate;
info.channels = channels;
info.duration = duration;
info.video_length = duration * fps.ToFloat();
info.pixel_ratio.num = 1;
info.pixel_ratio.den = 1;
info.video_timebase = fps.Reciprocal();
info.acodec = "raw";
// Calculate the DAR (display aspect ratio)
Fraction size(info.width * info.pixel_ratio.num, info.height * info.pixel_ratio.den);
// Reduce size fraction
size.Reduce();
// Set the ratio based on the reduced fraction
info.display_ratio.num = size.num;
info.display_ratio.den = size.den;
// Open and Close the reader, to populate it's attributes (such as height, width, etc...)
Open();
Close();
}
// Calculate time of a frame number, based on a framerate
float Timeline::calculate_time(long int number, Fraction rate)
{
// Get float version of fps fraction
float raw_fps = rate.ToFloat();
// Return the time (in seconds) of this frame
return float(number - 1) / raw_fps;
}