Aegisub/SSATool/TimeCodes.cs

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/*
SSATool - A collection of utilities for Advanced Substation Alpha
Copyright (C) 2007 Dan Donovan
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; ONLY under version 2
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
using System;
using System.Text;
using System.IO;
namespace SSATool {
public class TimeCodes {
private float[] times;
private double frameRate;
public TimeCodes(string filename, double frameRate) {
this.frameRate = frameRate;
double AssumeFPS = 29.97;
string thisline;
int frames = 0, index;
bool v1;
StreamReader fs = new StreamReader(filename);
thisline = fs.ReadLine(); // Save the first line now
if (string.Compare(thisline, "# timecode format v1", true, Util.cfi) == 0) v1 = true;
else if (string.Compare(thisline, "# timecode format v2", true, Util.cfi) == 0) v1 = false;
else throw new InvalidDataException("File was not detected as an MKV TimeCode v1 or v2 file.");
//count frames
while (!fs.EndOfStream) {
if ((fs.Peek() != '#') && ((thisline = fs.ReadLine()).Length > 3)) {
if (v1 == false) frames+=1;
else frames = Math.Max(frames, int.Parse(thisline.Split(",".ToCharArray())[1]));
}
else if ((fs.Peek() == 'A' || fs.Peek() == 'a') && (string.Compare(thisline.Split(" ".ToCharArray())[0], "assumefps", true, Util.cfi) == 0))
AssumeFPS = double.Parse(thisline.Split(" ".ToCharArray())[1]);
}
fs.Close();
//restart, actually saving info
fs = new StreamReader(filename);
while ((fs.Peek() == '#') || (fs.Peek() == 'a') || (fs.Peek() == 'A'))
fs.ReadLine();
times = new float[frames];
for (index = 0;index < frames;index+=1) {
if (v1) {
string[] splitv1 = fs.ReadLine().Split(",".ToCharArray());
for (;index <= int.Parse(splitv1[1]);index+=1) // frames is the number of frames with v1, so index SHOULD go up for every frame
times[index] = ((index != 0) ? times[index - 1] : 0) + (float)(1.0 / ((splitv1.Length == 3) ? float.Parse(splitv1[2]) : AssumeFPS));
}
else
times[index] = float.Parse(fs.ReadLine());
}
fs.Close();
}
/// <summary>
/// Finds the frame number of a given VFR time, so that frame number can be used to convert to a CFR time
/// </summary>
/// <param name="time">The time in MILLISECONDS</param>
/// <returns></returns>
public int FindFrame(float time) {
int k, low = 0, high = times.Length-1;
while (low!=high) {
k=(int)Math.Ceiling((high+low)/2.0f);
if (times[k].CompareTo(time) == -1)
low=k;
else if (k!=0 && times[k-1].CompareTo(time) == -1)
return k;
else high=k;
}
return 0;
}
public TimeSpan GetTimeInverse(TimeSpan time) {
int frame = System.Convert.ToInt32(time.TotalSeconds * frameRate, Util.cfi);
return TimeSpan.FromMilliseconds((frame<times.Length)?times[frame]:0);
}
public TimeSpan GetTime(TimeSpan time) {
return TimeSpan.FromSeconds(FindFrame((float)time.TotalMilliseconds) / frameRate);
}
}
}