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fixes #887 - Support ttml subtitle output

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This commit is contained in:
Luke Pulverenti
2014-08-05 19:59:24 -04:00
parent 7e25c857a5
commit 3ba6364f25
35 changed files with 333 additions and 96 deletions
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1
MediaBrowser.MediaEncoding/MediaBrowser.MediaEncoding.csproj
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@@ -66,6 +66,7 @@
<Compile Include="Subtitles\SsaParser.cs" />
<Compile Include="Subtitles\SubtitleEncoder.cs" />
<Compile Include="Subtitles\SubtitleTrackInfo.cs" />
<Compile Include="Subtitles\TtmlWriter.cs" />
<Compile Include="Subtitles\VttWriter.cs" />
</ItemGroup>
<ItemGroup>

38
MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs
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@@ -48,6 +48,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles
string inputFormat,
string outputFormat,
long startTimeTicks,
long? endTimeTicks,
CancellationToken cancellationToken)
{
var ms = new MemoryStream();
@@ -56,6 +57,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles
{
// Return the original without any conversions, if possible
if (startTimeTicks == 0 &&
!endTimeTicks.HasValue &&
string.Equals(inputFormat, outputFormat, StringComparison.OrdinalIgnoreCase))
{
await stream.CopyToAsync(ms, 81920, cancellationToken).ConfigureAwait(false);
@@ -64,7 +66,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles
{
var trackInfo = await GetTrackInfo(stream, inputFormat, cancellationToken).ConfigureAwait(false);
UpdateStartingPosition(trackInfo, startTimeTicks);
FilterEvents(trackInfo, startTimeTicks, endTimeTicks, false);
var writer = GetWriter(outputFormat);
@@ -81,19 +83,30 @@ namespace MediaBrowser.MediaEncoding.Subtitles
return ms;
}
private void UpdateStartingPosition(SubtitleTrackInfo track, long startPositionTicks)
private void FilterEvents(SubtitleTrackInfo track, long startPositionTicks, long? endTimeTicks, bool preserveTimestamps)
{
if (startPositionTicks == 0) return;
// Drop subs that are earlier than what we're looking for
track.TrackEvents = track.TrackEvents
.SkipWhile(i => (i.StartPositionTicks - startPositionTicks) < 0 || (i.EndPositionTicks - startPositionTicks) < 0)
.ToList();
foreach (var trackEvent in track.TrackEvents)
if (endTimeTicks.HasValue)
{
trackEvent.EndPositionTicks -= startPositionTicks;
trackEvent.StartPositionTicks -= startPositionTicks;
var endTime = endTimeTicks.Value;
track.TrackEvents = track.TrackEvents
.TakeWhile(i => i.StartPositionTicks <= endTime)
.ToList();
}
track.TrackEvents = track.TrackEvents
.SkipWhile(i => i.StartPositionTicks < 0 || i.EndPositionTicks < 0)
.ToList();
if (!preserveTimestamps)
{
foreach (var trackEvent in track.TrackEvents)
{
trackEvent.EndPositionTicks -= startPositionTicks;
trackEvent.StartPositionTicks -= startPositionTicks;
}
}
}
public async Task<Stream> GetSubtitles(string itemId,
@@ -101,6 +114,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles
int subtitleStreamIndex,
string outputFormat,
long startTimeTicks,
long? endTimeTicks,
CancellationToken cancellationToken)
{
var subtitle = await GetSubtitleStream(itemId, mediaSourceId, subtitleStreamIndex, cancellationToken)
@@ -110,7 +124,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles
{
var inputFormat = subtitle.Item2;
return await ConvertSubtitles(stream, inputFormat, outputFormat, startTimeTicks, cancellationToken).ConfigureAwait(false);
return await ConvertSubtitles(stream, inputFormat, outputFormat, startTimeTicks, endTimeTicks, cancellationToken).ConfigureAwait(false);
}
}
@@ -254,6 +268,10 @@ namespace MediaBrowser.MediaEncoding.Subtitles
{
return new VttWriter();
}
if (string.Equals(format, SubtitleFormat.TTML, StringComparison.OrdinalIgnoreCase))
{
return new TtmlWriter();
}
throw new ArgumentException("Unsupported format: " + format);
}

59
MediaBrowser.MediaEncoding/Subtitles/TtmlWriter.cs Normal file
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@@ -0,0 +1,59 @@
using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
namespace MediaBrowser.MediaEncoding.Subtitles
{
public class TtmlWriter : ISubtitleWriter
{
public void Write(SubtitleTrackInfo info, Stream stream, CancellationToken cancellationToken)
{
// Example: https://github.com/zmalltalker/ttml2vtt/blob/master/data/sample.xml
// Parser example: https://github.com/mozilla/popcorn-js/blob/master/parsers/parserTTML/popcorn.parserTTML.js
using (var writer = new StreamWriter(stream, Encoding.UTF8, 1024, true))
{
writer.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
writer.WriteLine("<tt xmlns=\"http://www.w3.org/ns/ttml\" xmlns:tts=\"http://www.w3.org/2006/04/ttaf1#styling\" lang=\"no\">");
writer.WriteLine("<head>");
writer.WriteLine("<styling>");
writer.WriteLine("<style id=\"italic\" tts:fontStyle=\"italic\" />");
writer.WriteLine("<style id=\"left\" tts:textAlign=\"left\" />");
writer.WriteLine("<style id=\"center\" tts:textAlign=\"center\" />");
writer.WriteLine("<style id=\"right\" tts:textAlign=\"right\" />");
writer.WriteLine("</styling>");
writer.WriteLine("</head>");
writer.WriteLine("<body>");
writer.WriteLine("<div>");
foreach (var trackEvent in info.TrackEvents)
{
var text = trackEvent.Text;
text = Regex.Replace(text, @"\\N", "<br/>", RegexOptions.IgnoreCase);
writer.WriteLine("<p begin=\"{0}\" dur=\"{1}\">{2}</p>",
trackEvent.StartPositionTicks,
(trackEvent.EndPositionTicks - trackEvent.StartPositionTicks),
text);
}
writer.WriteLine("</div>");
writer.WriteLine("</body>");
writer.WriteLine("</tt>");
}
}
private string FormatTime(long ticks)
{
var time = TimeSpan.FromTicks(ticks);
return string.Format(@"{0:hh\:mm\:ss\,fff}", time);
}
}
}