FFMpegCore/FFMpegCore/FFMpeg/Arguments/SilenceDetectArgument.cs

using System.Globalization;

namespace FFMpegCore.Arguments;

public class SilenceDetectArgument : IAudioFilterArgument
{
    private readonly Dictionary<string, string> _arguments = new();

    /// <summary>
    ///     Silence Detection. <see href="https://ffmpeg.org/ffmpeg-filters.html#silencedetect" />
    /// </summary>
    /// <param name="noise_type">Set noise type to db (decibel) or ar (amplitude ratio). Default is dB</param>
    /// <param name="noise">
    ///     Set noise tolerance. Can be specified in dB (in case "dB" is appended to the specified value) or amplitude ratio.
    ///     Default is -60dB, or 0.001.
    /// </param>
    /// <param name="duration">
    ///     Set silence duration until notification (default is 2 seconds). See (ffmpeg-utils)the Time duration section in the
    ///     ffmpeg-utils(1) manual for the accepted syntax.
    /// </param>
    /// <param name="mono">Process each channel separately, instead of combined. By default is disabled.</param>
    public SilenceDetectArgument(string noise_type = "db", double noise = 60, double duration = 2, bool mono = false)
    {
        if (noise_type == "db")
        {
            _arguments.Add("n", $"{noise.ToString("0.0", CultureInfo.InvariantCulture)}dB");
        }
        else if (noise_type == "ar")
        {
            _arguments.Add("n", noise.ToString("0.00", CultureInfo.InvariantCulture));
        }
        else
        {
            throw new ArgumentOutOfRangeException(nameof(noise_type), "Noise type must be either db or ar");
        }

        _arguments.Add("d", duration.ToString("0.00", CultureInfo.InvariantCulture));
        _arguments.Add("m", (mono ? 1 : 0).ToString());
    }

    public string Key { get; } = "silencedetect";

    public string Value => string.Join(":", _arguments.Select(pair => $"{pair.Key}={pair.Value}"));
}