Ejemplo n.º 1
0
        public async Task <Stream> EncodeImage(ImageEncodingOptions options, CancellationToken cancellationToken)
        {
            ValidateInput(options);

            await ResourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);

            try
            {
                return(await EncodeImageInternal(options, cancellationToken).ConfigureAwait(false));
            }
            finally
            {
                ResourcePool.Release();
            }
        }
Ejemplo n.º 2
0
        private string GetArguments(ImageEncodingOptions options, string inputFilename)
        {
            var vfScale      = GetFilterGraph(options);
            var outputFormat = GetOutputFormat(options.Format);

            var quality = (options.Quality ?? 100) * .3;

            quality = 31 - quality;
            var qualityValue = Convert.ToInt32(Math.Max(quality, 1));

            return(string.Format("-f image2 -i file:\"{3}\" -q:v {0} {1} -f image2pipe -vcodec {2} -",
                                 qualityValue.ToString(_usCulture),
                                 vfScale,
                                 outputFormat,
                                 inputFilename));
        }
Ejemplo n.º 3
0
        private string GetFilterGraph(ImageEncodingOptions options)
        {
            if (!options.Width.HasValue &&
                !options.Height.HasValue &&
                !options.MaxHeight.HasValue &&
                !options.MaxWidth.HasValue)
            {
                return(string.Empty);
            }

            var widthScale  = "-1";
            var heightScale = "-1";

            if (options.MaxWidth.HasValue)
            {
                widthScale = "min(iw\\," + options.MaxWidth.Value.ToString(_usCulture) + ")";
            }
            else if (options.Width.HasValue)
            {
                widthScale = options.Width.Value.ToString(_usCulture);
            }

            if (options.MaxHeight.HasValue)
            {
                heightScale = "min(ih\\," + options.MaxHeight.Value.ToString(_usCulture) + ")";
            }
            else if (options.Height.HasValue)
            {
                heightScale = options.Height.Value.ToString(_usCulture);
            }

            var scaleMethod = "lanczos";

            return(string.Format("-vf scale=\"{0}:{1}\"",
                                 widthScale,
                                 heightScale));
        }
Ejemplo n.º 4
0
 public Task <Stream> EncodeImage(ImageEncodingOptions options, CancellationToken cancellationToken)
 {
     return(new ImageEncoder(FFMpegPath, _logger, _fileSystem, _appPaths).EncodeImage(options, cancellationToken));
 }
Ejemplo n.º 5
0
 public Task <Stream> EncodeImage(ImageEncodingOptions options, CancellationToken cancellationToken)
 {
     throw new NotImplementedException();
 }
Ejemplo n.º 6
0
        private async Task <Stream> EncodeImageInternal(ImageEncodingOptions options, CancellationToken cancellationToken)
        {
            ValidateInput(options);

            var inputPath = options.InputPath;
            var filename  = Path.GetFileName(inputPath);

            if (HasDiacritics(filename))
            {
                inputPath = GetTempFile(inputPath);
                filename  = Path.GetFileName(inputPath);
            }

            var process = new Process
            {
                StartInfo = new ProcessStartInfo
                {
                    CreateNoWindow         = true,
                    UseShellExecute        = false,
                    FileName               = _ffmpegPath,
                    Arguments              = GetArguments(options, filename),
                    WindowStyle            = ProcessWindowStyle.Hidden,
                    ErrorDialog            = false,
                    RedirectStandardOutput = true,
                    RedirectStandardError  = true,
                    WorkingDirectory       = Path.GetDirectoryName(inputPath)
                }
            };

            _logger.Debug("ffmpeg " + process.StartInfo.Arguments);

            process.Start();

            var memoryStream = new MemoryStream();

#pragma warning disable 4014
            // Important - don't await the log task or we won't be able to kill ffmpeg when the user stops playback
            process.StandardOutput.BaseStream.CopyToAsync(memoryStream);
#pragma warning restore 4014

            // MUST read both stdout and stderr asynchronously or a deadlock may occurr
            process.BeginErrorReadLine();

            var ranToCompletion = process.WaitForExit(5000);

            if (!ranToCompletion)
            {
                try
                {
                    _logger.Info("Killing ffmpeg process");

                    process.Kill();

                    process.WaitForExit(1000);
                }
                catch (Exception ex)
                {
                    _logger.ErrorException("Error killing process", ex);
                }
            }

            var exitCode = ranToCompletion ? process.ExitCode : -1;

            process.Dispose();

            if (exitCode == -1 || memoryStream.Length == 0)
            {
                memoryStream.Dispose();

                var msg = string.Format("ffmpeg image encoding failed for {0}", options.InputPath);

                _logger.Error(msg);

                throw new ApplicationException(msg);
            }

            memoryStream.Position = 0;
            return(memoryStream);
        }
Ejemplo n.º 7
0
 private void ValidateInput(ImageEncodingOptions options)
 {
 }