/// <summary>
/// Converts decoded, raw frame data in the frame source into a a usable frame. <br />
/// The process includes performing picture, samples or text conversions
/// so that the decoded source frame data is easily usable in multimedia applications
/// </summary>
/// <param name="input">The source frame to use as an input.</param>
/// <param name="output">The target frame that will be updated with the source frame. If null is passed the frame will be instantiated.</param>
/// <param name="siblings">The sibling blocks that may help guess some additional parameters for the input frame.</param>
/// <returns>
/// Return the updated output frame
/// </returns>
/// <exception cref="ArgumentNullException">input cannot be null</exception>
public override MediaBlock MaterializeFrame(MediaFrame input, ref MediaBlock output, List <MediaBlock> siblings)
{
if (output == null)
{
output = new SubtitleBlock();
}
var source = input as SubtitleFrame;
var target = output as SubtitleBlock;
if (source == null || target == null)
{
throw new ArgumentNullException($"{nameof(input)} and {nameof(output)} are either null or not of a compatible media type '{MediaType}'");
}
// Set the target data
target.EndTime = source.EndTime;
target.StartTime = source.StartTime;
target.Duration = source.Duration;
target.StreamIndex = input.StreamIndex;
target.OriginalText.Clear();
if (source.Text.Count > 0)
{
target.OriginalText.AddRange(source.Text);
}
target.OriginalTextType = source.TextType;
target.Text.Clear();
foreach (var text in source.Text)
{
if (string.IsNullOrWhiteSpace(text))
{
continue;
}
if (source.TextType == AVSubtitleType.SUBTITLE_ASS)
{
var strippedText = StripAssFormat(text);
if (string.IsNullOrWhiteSpace(strippedText) == false)
{
target.Text.Add(strippedText);
}
}
else
{
var strippedText = StripSrtFormat(text);
if (string.IsNullOrWhiteSpace(strippedText) == false)
{
target.Text.Add(strippedText);
}
}
}
return(target);
}
/// <summary>
/// Converts decoded, raw frame data in the frame source into a a usable frame. <br />
/// The process includes performing picture, samples or text conversions
/// so that the decoded source frame data is easily usable in multimedia applications
/// </summary>
/// <param name="input">The source frame to use as an input.</param>
/// <param name="output">The target frame that will be updated with the source frame. If null is passed the frame will be instantiated.</param>
/// <returns>
/// Return the updated output frame
/// </returns>
/// <exception cref="System.ArgumentNullException">input</exception>
internal override MediaBlock MaterializeFrame(MediaFrame input, ref MediaBlock output)
{
if (output == null)
{
output = new SubtitleBlock();
}
var source = input as SubtitleFrame;
var target = output as SubtitleBlock;
if (source == null || target == null)
{
throw new ArgumentNullException($"{nameof(input)} and {nameof(output)} are either null or not of a compatible media type '{MediaType}'");
}
// Set the target data
target.EndTime = source.EndTime;
target.StartTime = source.StartTime;
target.Duration = source.Duration;
target.Text.Clear();
target.Text.AddRange(source.Text);
return(target);
}
/// <summary>
/// Converts decoded, raw frame data in the frame source into a a usable frame. <br />
/// The process includes performing picture, samples or text conversions
/// so that the decoded source frame data is easily usable in multimedia applications
/// </summary>
/// <param name="input">The source frame to use as an input.</param>
/// <param name="output">The target frame that will be updated with the source frame. If null is passed the frame will be instantiated.</param>
/// <param name="siblings">The sibling blocks that may help guess some additional parameters for the input frame.</param>
/// <returns>
/// Returns true if successful. False otherwise
/// </returns>
/// <exception cref="ArgumentNullException">input cannot be null</exception>
public override bool MaterializeFrame(MediaFrame input, ref MediaBlock output, List <MediaBlock> siblings)
{
if (output == null)
{
output = new SubtitleBlock();
}
var source = input as SubtitleFrame;
var target = output as SubtitleBlock;
if (source == null || target == null)
{
throw new ArgumentNullException($"{nameof(input)} and {nameof(output)} are either null or not of a compatible media type '{MediaType}'");
}
// Set the target data
target.EndTime = source.EndTime;
target.StartTime = source.StartTime;
target.Duration = source.Duration;
target.StreamIndex = input.StreamIndex;
// Process time offsets
if (Delay != TimeSpan.Zero)
{
target.StartTime = TimeSpan.FromTicks(target.StartTime.Ticks + Delay.Ticks);
target.EndTime = TimeSpan.FromTicks(target.EndTime.Ticks + Delay.Ticks);
target.Duration = TimeSpan.FromTicks(target.EndTime.Ticks - target.StartTime.Ticks);
}
target.OriginalText.Clear();
if (source.Text.Count > 0)
{
target.OriginalText.AddRange(source.Text);
}
target.OriginalTextType = source.TextType;
target.Text.Clear();
foreach (var text in source.Text)
{
if (string.IsNullOrWhiteSpace(text))
{
continue;
}
if (source.TextType == AVSubtitleType.SUBTITLE_ASS)
{
var strippedText = StripAssFormat(text);
if (string.IsNullOrWhiteSpace(strippedText) == false)
{
target.Text.Add(strippedText);
}
}
else
{
var strippedText = StripSrtFormat(text);
if (string.IsNullOrWhiteSpace(strippedText) == false)
{
target.Text.Add(strippedText);
}
}
}
// TODO: CompressedSize is just an estimate.
// It would be better if we counted chars in all text lines.
target.CompressedSize = source.CompressedSize;
return(true);
}