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added image encoder methods

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This commit is contained in:
Luke Pulverenti
2014-03-27 23:32:43 -04:00
parent eda0939b90
commit 1664de62c0
6 changed files with 117 additions and 95 deletions
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65
MediaBrowser.MediaEncoding/Encoder/ImageEncoder.cs
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@@ -1,4 +1,5 @@
using MediaBrowser.Controller.MediaEncoding;
using MediaBrowser.Common.IO;
using MediaBrowser.Controller.MediaEncoding;
using MediaBrowser.Model.Logging;
using System;
using System.Diagnostics;
@@ -13,20 +14,39 @@ namespace MediaBrowser.MediaEncoding.Encoder
{
private readonly string _ffmpegPath;
private readonly ILogger _logger;
private readonly IFileSystem _fileSystem;
private readonly CultureInfo _usCulture = new CultureInfo("en-US");
private static readonly SemaphoreSlim ResourcePool = new SemaphoreSlim(5, 5);
private static readonly SemaphoreSlim ResourcePool = new SemaphoreSlim(10, 10);
public ImageEncoder(string ffmpegPath, ILogger logger)
public ImageEncoder(string ffmpegPath, ILogger logger, IFileSystem fileSystem)
{
_ffmpegPath = ffmpegPath;
_logger = logger;
_fileSystem = fileSystem;
}
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();
}
}
private async Task<Stream> EncodeImageInternal(ImageEncodingOptions options, CancellationToken cancellationToken)
{
ValidateInput(options);
var process = new Process
{
StartInfo = new ProcessStartInfo
@@ -38,11 +58,12 @@ namespace MediaBrowser.MediaEncoding.Encoder
WindowStyle = ProcessWindowStyle.Hidden,
ErrorDialog = false,
RedirectStandardOutput = true,
RedirectStandardError = true
RedirectStandardError = true,
WorkingDirectory = Path.GetDirectoryName(options.InputPath)
}
};
await ResourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
_logger.Debug("ffmpeg " + process.StartInfo.Arguments);
process.Start();
@@ -74,8 +95,6 @@ namespace MediaBrowser.MediaEncoding.Encoder
}
}
ResourcePool.Release();
var exitCode = ranToCompletion ? process.ExitCode : -1;
process.Dispose();
@@ -94,16 +113,21 @@ namespace MediaBrowser.MediaEncoding.Encoder
memoryStream.Position = 0;
return memoryStream;
}
private string GetArguments(ImageEncodingOptions options)
{
var vfScale = GetFilterGraph(options);
var outputFormat = GetOutputFormat(options);
var outputFormat = GetOutputFormat(options.Format);
return string.Format("-i file:\"{0}\" {1} -f {2}",
options.InputPath,
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);
outputFormat,
Path.GetFileName(options.InputPath));
}
private string GetFilterGraph(ImageEncodingOptions options)
@@ -121,7 +145,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
if (options.MaxWidth.HasValue)
{
widthScale = "min(iw," + options.MaxWidth.Value.ToString(_usCulture) + ")";
widthScale = "min(iw\\," + options.MaxWidth.Value.ToString(_usCulture) + ")";
}
else if (options.Width.HasValue)
{
@@ -130,7 +154,7 @@ namespace MediaBrowser.MediaEncoding.Encoder
if (options.MaxHeight.HasValue)
{
heightScale = "min(ih," + options.MaxHeight.Value.ToString(_usCulture) + ")";
heightScale = "min(ih\\," + options.MaxHeight.Value.ToString(_usCulture) + ")";
}
else if (options.Height.HasValue)
{
@@ -139,15 +163,20 @@ namespace MediaBrowser.MediaEncoding.Encoder
var scaleMethod = "lanczos";
return string.Format("-vf scale=\"{0}:{1}\" -sws_flags {2}",
widthScale,
return string.Format("-vf scale=\"{0}:{1}\" -sws_flags {2}",
widthScale,
heightScale,
scaleMethod);
}
private string GetOutputFormat(ImageEncodingOptions options)
private string GetOutputFormat(string format)
{
return options.Format;
if (string.Equals(format, "jpeg", StringComparison.OrdinalIgnoreCase) ||
string.Equals(format, "jpg", StringComparison.OrdinalIgnoreCase))
{
return "mjpeg";
}
return format;
}
private void ValidateInput(ImageEncodingOptions options)