88 lines
3.2 KiB
C#
88 lines
3.2 KiB
C#
using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using ErsatzTV.Core;
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using ErsatzTV.Core.Domain;
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using ErsatzTV.Core.Interfaces.Repositories;
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using LanguageExt;
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using MediatR;
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namespace ErsatzTV.Application.Streaming.Queries;
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public class GetLastPtsDurationHandler : IRequestHandler<GetLastPtsDuration, Either<BaseError, PtsAndDuration>>
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{
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private readonly IConfigElementRepository _configElementRepository;
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public GetLastPtsDurationHandler(IConfigElementRepository configElementRepository)
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{
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_configElementRepository = configElementRepository;
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}
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public async Task<Either<BaseError, PtsAndDuration>> Handle(
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GetLastPtsDuration request,
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CancellationToken cancellationToken)
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{
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Validation<BaseError, RequestParameters> validation = await Validate(request);
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return await validation.Match(
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Handle,
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error => Task.FromResult<Either<BaseError, PtsAndDuration>>(error.Join()));
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}
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private async Task<Validation<BaseError, RequestParameters>> Validate(GetLastPtsDuration request) =>
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await ValidateFFprobePath()
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.MapT(
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ffprobePath => new RequestParameters(
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request.FileName,
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ffprobePath));
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private async Task<Either<BaseError, PtsAndDuration>> Handle(RequestParameters parameters)
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{
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var startInfo = new ProcessStartInfo
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{
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FileName = parameters.FFprobePath,
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RedirectStandardOutput = true,
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RedirectStandardError = true,
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UseShellExecute = false,
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StandardOutputEncoding = Encoding.UTF8,
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StandardErrorEncoding = Encoding.UTF8
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};
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startInfo.ArgumentList.Add("-v");
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startInfo.ArgumentList.Add("0");
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startInfo.ArgumentList.Add("-show_entries");
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startInfo.ArgumentList.Add("packet=pts,duration");
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startInfo.ArgumentList.Add("-of");
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startInfo.ArgumentList.Add("compact=p=0:nk=1");
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startInfo.ArgumentList.Add("-read_intervals");
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startInfo.ArgumentList.Add("-999999");
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startInfo.ArgumentList.Add(parameters.FileName);
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var probe = new Process
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{
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StartInfo = startInfo
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};
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probe.Start();
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return await probe.StandardOutput.ReadToEndAsync().MapAsync<string, Either<BaseError, PtsAndDuration>>(
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async output =>
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{
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await probe.WaitForExitAsync();
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return probe.ExitCode == 0
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? PtsAndDuration.From(output.Split("\n").Filter(s => !string.IsNullOrWhiteSpace(s)).Last().Trim())
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: BaseError.New($"FFprobe at {parameters.FFprobePath} exited with code {probe.ExitCode}");
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});
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}
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private Task<Validation<BaseError, string>> ValidateFFprobePath() =>
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_configElementRepository.GetValue<string>(ConfigElementKey.FFprobePath)
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.FilterT(File.Exists)
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.Map(
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ffprobePath =>
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ffprobePath.ToValidation<BaseError>("FFprobe path does not exist on the file system"));
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private record RequestParameters(string FileName, string FFprobePath);
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}
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