// 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();
}
// Default Constructor for the timeline (which sets the canvas width and height)
Timeline::Timeline(int width, int height, Fraction fps, int sample_rate, int channels, ChannelLayout channel_layout) :
is_open(false), auto_map_clips(true)
{
// Init viewport size (curve based, because it can be animated)
viewport_scale = Keyframe(100.0);
viewport_x = Keyframe(0.0);
viewport_y = Keyframe(0.0);
// Init background color
color.red = Keyframe(0.0);
color.green = Keyframe(0.0);
color.blue = Keyframe(0.0);
// Init FileInfo struct (clear all values)
info.width = width;
info.height = height;
info.fps = fps;
info.sample_rate = sample_rate;
info.channels = channels;
info.channel_layout = channel_layout;
info.video_timebase = fps.Reciprocal();
info.duration = 60 * 30; // 30 minute default duration
info.has_audio = true;
info.has_video = true;
info.video_length = info.fps.ToFloat() * info.duration;
// Init cache
final_cache.SetMaxBytesFromInfo(OPEN_MP_NUM_PROCESSORS * 3, info.width, info.height, info.sample_rate, info.channels);
}
// Calculate the # of samples per video frame (for a specific frame number and frame rate)
int Frame::GetSamplesPerFrame(long int number, Fraction fps, int sample_rate, int channels)
{
// Get the total # of samples for the previous frame, and the current frame (rounded)
double fps_rate = fps.Reciprocal().ToDouble();
// Determine previous samples total, and make sure it's evenly divisible by the # of channels
double previous_samples = (sample_rate * fps_rate) * (number - 1);
double previous_samples_remainder = fmod(previous_samples, (double)channels); // subtract the remainder to the total (to make it evenly divisible)
previous_samples -= previous_samples_remainder;
// Determine the current samples total, and make sure it's evenly divisible by the # of channels
double total_samples = (sample_rate * fps_rate) * number;
double total_samples_remainder = fmod(total_samples, (double)channels); // subtract the remainder to the total (to make it evenly divisible)
total_samples -= total_samples_remainder;
// Subtract the previous frame's total samples with this frame's total samples. Not all sample rates can
// be evenly divided into frames, so each frame can have have different # of samples.
int samples_per_frame = round(total_samples - previous_samples);
return samples_per_frame;
}
