FFMpegCore/FFMpegCore/FFMpeg/Arguments/MapStreamArgument.cs

using FFMpegCore.Enums;

namespace FFMpegCore.Arguments;

/// <summary>
///     Represents choice of stream by the stream specifier
/// </summary>
public class MapStreamArgument : IArgument
{
    private readonly Channel _channel;
    private readonly int _inputFileIndex;
    private readonly bool _negativeMap;
    private readonly int _streamIndex;

    public MapStreamArgument(int streamIndex, int inputFileIndex, Channel channel = Channel.All, bool negativeMap = false)
    {
        if (channel == Channel.Both)
        {
            // "Both" is not valid in this case and probably means all stream types
            channel = Channel.All;
        }

        _inputFileIndex = inputFileIndex;
        _streamIndex = streamIndex;
        _channel = channel;
        _negativeMap = negativeMap;
    }

    public string Text => $"-map {(_negativeMap ? "-" : "")}{_inputFileIndex}{_channel.StreamType()}:{_streamIndex}";
}