/// <summary>Auto syncs a range of subtitles given their first and last correct frames.</summary>
/// <remarks>The subtitles are first shifted to the first subtitle's correct frame, and then proportionally
/// adjusted using the last subtitle's correct frame.</remarks>
/// <param name="subtitles">The subtitles to sync.</param>
/// <param name="startIndex">The subtitle index to start the adjustment with.</param>
/// <param name="startFrame">The correct start frame for the first subtitle.</param>
/// <param name="endIndex">The subtitle index to end the adjustment with.</param>
/// <param name="endFrame">The correct start frame for the last subtitle.</param>
/// <param name="syncLast">Whether to sync the last subtitle.</param>
/// <returns>Whether the subtitles could be adjusted.</returns>
public static bool Sync(Subtitles subtitles, int startIndex, int startFrame, int endIndex, int endFrame, bool syncLast)
{
if (!AreSyncArgsValid(subtitles, startIndex, startFrame, endIndex, endFrame))
{
return(false);
}
/* Perform initial calculations */
int syncEndIndex = (syncLast ? endIndex : endIndex - 1);
Subtitle startSubtitle = subtitles.Collection.Get(startIndex);
int shift = (int)(startFrame - startSubtitle.Frames.PreciseStart);
Subtitle endSubtitle = subtitles.Collection.Get(endIndex);
double factor = (endFrame - startFrame) / (endSubtitle.Frames.PreciseStart - startFrame);
/* Shift subtitles to the start point */
if (shift != 0)
{
ShiftOperator shiftOp = new ShiftOperator(subtitles);
shiftOp.Shift(shift, startIndex, syncEndIndex);
}
/* Auto adjust timings with proportion */
for (int index = startIndex; index <= syncEndIndex; index++)
{
Subtitle subtitle = subtitles.Collection.Get(index);
subtitle.Frames.Scale(factor, startFrame);
}
return(true);
}
/// <summary>Auto syncs a range of subtitles given their first and last correct times.</summary>
/// <remarks>The subtitles are first shifted to the first subtitle's correct time, and then proportionally
/// adjusted using the last subtitle's correct time.</remarks>
/// <param name="subtitles">The subtitles to sync.</param>
/// <param name="startIndex">The subtitle index to start the adjustment with.</param>
/// <param name="startTime">The correct start time for the first subtitle.</param>
/// <param name="endIndex">The subtitle index to end the adjustment with.</param>
/// <param name="endTime">The correct start time for the last subtitle.</param>
/// <param name="syncLast">Whether to sync the last subtitle.</param>
/// <returns>Whether the subtitles could be adjusted.</returns>
public static bool Sync(Subtitles subtitles, int startIndex, TimeSpan startTime, int endIndex, TimeSpan endTime, bool syncLast)
{
if (!AreSyncArgsValid(subtitles, startIndex, startTime, endIndex, endTime))
{
return(false);
}
/* Perform initial calculations */
int syncEndIndex = (syncLast ? endIndex : endIndex - 1);
Subtitle startSubtitle = subtitles.Collection.Get(startIndex);
TimeSpan shift = startTime - startSubtitle.Times.PreciseStart;
Subtitle endSubtitle = subtitles.Collection.Get(endIndex);
double factor = (endTime - startTime).TotalMilliseconds / (endSubtitle.Times.PreciseStart - startSubtitle.Times.PreciseStart).TotalMilliseconds;
/* Shift subtitles to the start point */
if (shift != TimeSpan.Zero)
{
ShiftOperator shiftOp = new ShiftOperator(subtitles);
shiftOp.Shift(shift, startIndex, syncEndIndex);
}
/* Sync timings with proportion */
for (int index = startIndex; index <= syncEndIndex; index++)
{
Subtitle subtitle = subtitles.Collection.Get(index);
subtitle.Times.Scale(factor, startTime);
}
return(true);
}