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updated mpeg dash

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This commit is contained in:
Luke Pulverenti 2015-03-16 10:40:44 -04:00
parent ca492d105e
commit 3c92842bce
2 changed files with 178 additions and 98 deletions
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6
MediaBrowser.Api/Playback/Dash/ManifestBuilder.cs
View file

@ -196,8 +196,12 @@ namespace MediaBrowser.Api.Playback.Dash
while (seconds > 0)
{
var filename = index == 0
? "init"
: (index - 1).ToString(UsCulture);
var segmentUrl = string.Format("dash/{3}/{0}{1}{2}",
index.ToString(UsCulture),
filename,
extension,
SecurityElement.Escape(queryString),
type);

270
MediaBrowser.Api/Playback/Dash/MpegDashService.cs
View file

@ -119,7 +119,9 @@ namespace MediaBrowser.Api.Playback.Dash
var cancellationTokenSource = new CancellationTokenSource();
var cancellationToken = cancellationTokenSource.Token;
var index = int.Parse(segmentId, NumberStyles.Integer, UsCulture);
var index = string.Equals(segmentId, "init", StringComparison.OrdinalIgnoreCase) ?
-1 :
int.Parse(segmentId, NumberStyles.Integer, UsCulture);
var state = await GetState(request, cancellationToken).ConfigureAwait(false);
@ -148,31 +150,36 @@ namespace MediaBrowser.Api.Playback.Dash
}
else
{
var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath, segmentExtension);
if (currentTranscodingIndex == null || index < currentTranscodingIndex.Value || (index - currentTranscodingIndex.Value) > 4)
if (string.Equals(representationId, "0", StringComparison.OrdinalIgnoreCase))
{
// If the playlist doesn't already exist, startup ffmpeg
try
var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath, segmentExtension);
Logger.Debug("Current transcoding index is {0}", currentTranscodingIndex ?? -2);
if (currentTranscodingIndex == null || index < currentTranscodingIndex.Value || (index - currentTranscodingIndex.Value) > 4)
{
ApiEntryPoint.Instance.KillTranscodingJobs(j => j.Type == TranscodingJobType && string.Equals(j.DeviceId, request.DeviceId, StringComparison.OrdinalIgnoreCase), p => !string.Equals(p, playlistPath, StringComparison.OrdinalIgnoreCase));
if (currentTranscodingIndex.HasValue)
// If the playlist doesn't already exist, startup ffmpeg
try
{
DeleteLastFile(playlistPath, segmentExtension, 0, 0);
KillTranscodingJobs(request.DeviceId, playlistPath);
if (currentTranscodingIndex.HasValue)
{
DeleteTranscodedFiles(playlistPath, 0);
}
var positionTicks = GetPositionTicks(state, index);
request.StartTimeTicks = positionTicks;
job = await StartFfMpeg(state, playlistPath, cancellationTokenSource, Path.GetDirectoryName(playlistPath)).ConfigureAwait(false);
Task.Run(() => MonitorDashProcess(playlistPath, positionTicks == 0, job, cancellationToken));
}
catch
{
state.Dispose();
throw;
}
request.StartTimeTicks = GetPositionTicks(state, index);
job = await StartFfMpeg(state, playlistPath, cancellationTokenSource, Path.GetDirectoryName(playlistPath)).ConfigureAwait(false);
await WaitForMinimumSegmentCount(playlistPath, 1, cancellationTokenSource.Token).ConfigureAwait(false);
}
catch
{
state.Dispose();
throw;
}
await WaitForMinimumSegmentCount(playlistPath, 1, cancellationTokenSource.Token).ConfigureAwait(false);
}
}
}
@ -188,12 +195,22 @@ namespace MediaBrowser.Api.Playback.Dash
}
Logger.Info("returning {0}", segmentPath);
job = job ?? ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType);
return await GetSegmentResult(playlistPath, segmentPath, index, segmentLength, job, cancellationToken).ConfigureAwait(false);
return await GetSegmentResult(playlistPath, segmentPath, index, segmentLength, job ?? ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType), cancellationToken).ConfigureAwait(false);
}
private void KillTranscodingJobs(string deviceId, string playlistPath)
{
ApiEntryPoint.Instance.KillTranscodingJobs(j => j.Type == TranscodingJobType && string.Equals(j.DeviceId, deviceId, StringComparison.OrdinalIgnoreCase), p => !string.Equals(p, playlistPath, StringComparison.OrdinalIgnoreCase));
}
private long GetPositionTicks(StreamState state, int segmentIndex)
{
if (segmentIndex <= 1)
{
return 0;
}
var startSeconds = segmentIndex * state.SegmentLength;
return TimeSpan.FromSeconds(startSeconds).Ticks;
}
@ -202,10 +219,6 @@ namespace MediaBrowser.Api.Playback.Dash
{
var tmpPath = playlist + ".tmp";
Logger.Debug("Waiting for {0} segments in {1}", segmentCount, playlist);
// Double since audio and video are split
segmentCount = segmentCount * 2;
// Account for the initial segments
segmentCount += 2;
while (true)
{
@ -223,20 +236,14 @@ namespace MediaBrowser.Api.Playback.Dash
{
using (var reader = new StreamReader(fileStream))
{
var count = 0;
while (!reader.EndOfStream)
{
var line = await reader.ReadLineAsync().ConfigureAwait(false);
if (line.IndexOf(".m4s", StringComparison.OrdinalIgnoreCase) != -1)
if (line.IndexOf("stream0-" + segmentCount.ToString("00000", CultureInfo.InvariantCulture) + ".m4s", StringComparison.OrdinalIgnoreCase) != -1)
{
count++;
if (count >= segmentCount)
{
Logger.Debug("Finished waiting for {0} segments in {1}", segmentCount, playlist);
return;
}
Logger.Debug("Finished waiting for {0} segments in {1}", segmentCount, playlist);
return;
}
}
await Task.Delay(100, cancellationToken).ConfigureAwait(false);
@ -258,29 +265,6 @@ namespace MediaBrowser.Api.Playback.Dash
return GetSegmentResult(segmentPath, segmentIndex, segmentLength, transcodingJob);
}
var segmentFilename = Path.GetFileName(segmentPath);
using (var fileStream = FileSystem.GetFileStream(playlistPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, true))
{
using (var reader = new StreamReader(fileStream))
{
var text = await reader.ReadToEndAsync().ConfigureAwait(false);
// If it appears in the playlist, it's done
if (text.IndexOf(segmentFilename, StringComparison.OrdinalIgnoreCase) != -1)
{
return GetSegmentResult(segmentPath, segmentIndex, segmentLength, transcodingJob);
}
}
}
// if a different file is encoding, it's done
//var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath);
//if (currentTranscodingIndex > segmentIndex)
//{
//return GetSegmentResult(segmentPath, segmentIndex);
//}
// Wait for the file to stop being written to, then stream it
var length = new FileInfo(segmentPath).Length;
var eofCount = 0;
@ -308,7 +292,7 @@ namespace MediaBrowser.Api.Playback.Dash
length = newLength;
await Task.Delay(100, cancellationToken).ConfigureAwait(false);
}
return GetSegmentResult(segmentPath, segmentIndex, segmentLength, transcodingJob);
}
@ -341,48 +325,27 @@ namespace MediaBrowser.Api.Playback.Dash
return null;
}
var indexString = Path.GetFileNameWithoutExtension(file.Name).Split('-').LastOrDefault();
return int.Parse(indexString, NumberStyles.Integer, UsCulture);
return GetIndex(file.Name);
}
private void DeleteLastFile(string path, string segmentExtension, int retryCount, int numDeleted)
public int GetIndex(string segmentFile)
{
var indexString = Path.GetFileNameWithoutExtension(segmentFile).Split('-').LastOrDefault();
if (string.Equals(indexString, "init", StringComparison.OrdinalIgnoreCase))
{
return -1;
}
return int.Parse(indexString, NumberStyles.Integer, UsCulture) - 1;
}
private void DeleteTranscodedFiles(string path, int retryCount)
{
const int numToDelete = 2;
if (retryCount >= 5)
{
return;
}
var filesToGet = numToDelete - numDeleted;
if (filesToGet < 1)
{
return;
}
var files = GetLastTranscodingFiles(path, segmentExtension, FileSystem, filesToGet);
foreach (var file in files)
{
try
{
FileSystem.DeleteFile(file.FullName);
numDeleted++;
}
catch (IOException ex)
{
Logger.ErrorException("Error deleting partial stream file(s) {0}", ex, file.FullName);
Thread.Sleep(100);
DeleteLastFile(path, segmentExtension, retryCount + 1, numDeleted);
}
catch (Exception ex)
{
Logger.ErrorException("Error deleting partial stream file(s) {0}", ex, file.FullName);
}
}
}
private static List<FileInfo> GetLastTranscodingFiles(string playlist, string segmentExtension, IFileSystem fileSystem, int count)
@ -408,10 +371,13 @@ namespace MediaBrowser.Api.Playback.Dash
{
var folder = Path.GetDirectoryName(playlist);
var number = index.ToString("00000", CultureInfo.InvariantCulture);
var number = index == -1 ?
"init" :
index.ToString("00000", CultureInfo.InvariantCulture);
var filename = "stream" + representationId + "-" + number + segmentExtension;
return Path.Combine(folder, filename);
return Path.Combine(folder, "completed", filename);
}
protected override string GetAudioArguments(StreamState state)
@ -493,9 +459,9 @@ namespace MediaBrowser.Api.Playback.Dash
var threads = GetNumberOfThreads(state, false);
var inputModifier = GetInputModifier(state);
var startNumber = GetStartNumber(state);
//var startNumber = GetStartNumber(state);
var initSegmentName = "stream$RepresentationID$-00000.m4s";
var initSegmentName = "stream$RepresentationID$-init.m4s";
var segmentName = "stream$RepresentationID$-$Number%05d$.m4s";
var args = string.Format("{0} {1} -map_metadata -1 -threads {2} {3} {4} -copyts {5} -f dash -init_seg_name \"{6}\" -media_seg_name \"{7}\" -use_template 0 -use_timeline 1 -min_seg_duration {8} -y \"{9}\"",
@ -529,6 +495,11 @@ namespace MediaBrowser.Api.Playback.Dash
segmentId = segmentRequest.SegmentId;
}
if (string.Equals(segmentId, "init", StringComparison.OrdinalIgnoreCase))
{
return -1;
}
return int.Parse(segmentId, NumberStyles.Integer, UsCulture);
}
@ -549,5 +520,110 @@ namespace MediaBrowser.Api.Playback.Dash
return TranscodingJobType.Dash;
}
}
private async void MonitorDashProcess(string playlist, bool moveInitSegment, TranscodingJob transcodingJob, CancellationToken cancellationToken)
{
var directory = new DirectoryInfo(Path.GetDirectoryName(playlist));
var completedDirectory = Path.Combine(Path.GetDirectoryName(playlist), "completed");
Directory.CreateDirectory(completedDirectory);
while (!cancellationToken.IsCancellationRequested)
{
try
{
var files = directory.EnumerateFiles("*.m4s", SearchOption.TopDirectoryOnly)
.OrderBy(FileSystem.GetCreationTimeUtc)
.ToList();
foreach (var file in files)
{
var fileIndex = GetIndex(file.Name);
if (fileIndex == -1 && !moveInitSegment)
{
continue;
}
await WaitForFileToBeComplete(file.FullName, playlist, transcodingJob, cancellationToken).ConfigureAwait(false);
var newName = fileIndex == -1
? "init.m4s"
: fileIndex.ToString("00000", CultureInfo.InvariantCulture) + ".m4s";
var representationId = file.FullName.IndexOf("stream0", StringComparison.OrdinalIgnoreCase) != -1 ?
"0" :
"1";
newName = "stream" + representationId + "-" + newName;
File.Copy(file.FullName, Path.Combine(completedDirectory, newName), true);
cancellationToken.ThrowIfCancellationRequested();
}
await Task.Delay(250, cancellationToken).ConfigureAwait(false);
}
catch (OperationCanceledException)
{
break;
}
catch (IOException)
{
}
}
}
private async Task WaitForFileToBeComplete(string segmentPath, string playlistPath, TranscodingJob transcodingJob, CancellationToken cancellationToken)
{
// If all transcoding has completed, just return immediately
if (transcodingJob != null && transcodingJob.HasExited)
{
return;
}
var segmentFilename = Path.GetFileName(segmentPath);
using (var fileStream = FileSystem.GetFileStream(playlistPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, true))
{
using (var reader = new StreamReader(fileStream))
{
var text = await reader.ReadToEndAsync().ConfigureAwait(false);
// If it appears in the playlist, it's done
if (text.IndexOf(segmentFilename, StringComparison.OrdinalIgnoreCase) != -1)
{
return;
}
}
}
// Wait for the file to stop being written to, then stream it
var length = new FileInfo(segmentPath).Length;
var eofCount = 0;
while (eofCount < 10)
{
var info = new FileInfo(segmentPath);
if (!info.Exists)
{
break;
}
var newLength = info.Length;
if (newLength == length)
{
eofCount++;
}
else
{
eofCount = 0;
}
length = newLength;
await Task.Delay(100, cancellationToken).ConfigureAwait(false);
}
}
}
}