ersatztv/ErsatzTV.FFmpeg/InputOption/StreamSeekInputOption.cs

using ErsatzTV.FFmpeg.Environment;

namespace ErsatzTV.FFmpeg.InputOption;

public class StreamSeekInputOption : IInputOption
{
    private readonly TimeSpan _start;

    public StreamSeekInputOption(TimeSpan start) => _start = start;

    public EnvironmentVariable[] EnvironmentVariables => [];
    public string[] GlobalOptions => [];
    public string[] InputOptions(InputFile inputFile) => ["-ss", $"{_start:c}"];
    public string[] FilterOptions => [];
    public string[] OutputOptions => [];
    public FrameState NextState(FrameState currentState) => currentState;

    public bool AppliesTo(AudioInputFile audioInputFile) => audioInputFile is not NullAudioInputFile;

    // don't seek into a still image
    public bool AppliesTo(VideoInputFile videoInputFile) => videoInputFile.VideoStreams.All(s => !s.StillImage);

    // never seek when concatenating
    public bool AppliesTo(ConcatInputFile concatInputFile) => false;

    public bool AppliesTo(GraphicsEngineInput graphicsEngineInput) => false;
}