1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
using System;
using System.Diagnostics;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Controller.MediaEncoding;
using MediaBrowser.Model.IO;
namespace MediaBrowser.Controller.Streaming;
/// <summary>
/// A progressive file stream for transferring transcoded files as they are written to.
/// </summary>
public class ProgressiveFileStream : Stream
{
private readonly Stream _stream;
private readonly TranscodingJob? _job;
private readonly ITranscodeManager? _transcodeManager;
private readonly int _timeoutMs;
private bool _disposed;
/// <summary>
/// Initializes a new instance of the <see cref="ProgressiveFileStream"/> class.
/// </summary>
/// <param name="filePath">The path to the transcoded file.</param>
/// <param name="job">The transcoding job information.</param>
/// <param name="transcodeManager">The transcode manager.</param>
/// <param name="timeoutMs">The timeout duration in milliseconds.</param>
public ProgressiveFileStream(string filePath, TranscodingJob? job, ITranscodeManager transcodeManager, int timeoutMs = 30000)
{
_job = job;
_transcodeManager = transcodeManager;
_timeoutMs = timeoutMs;
_stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, IODefaults.FileStreamBufferSize, FileOptions.Asynchronous | FileOptions.SequentialScan);
}
/// <summary>
/// Initializes a new instance of the <see cref="ProgressiveFileStream"/> class.
/// </summary>
/// <param name="stream">The stream to progressively copy.</param>
/// <param name="timeoutMs">The timeout duration in milliseconds.</param>
public ProgressiveFileStream(Stream stream, int timeoutMs = 30000)
{
_job = null;
_transcodeManager = null;
_timeoutMs = timeoutMs;
_stream = stream;
}
/// <inheritdoc />
public override bool CanRead => _stream.CanRead;
/// <inheritdoc />
public override bool CanSeek => false;
/// <inheritdoc />
public override bool CanWrite => false;
/// <inheritdoc />
public override long Length => throw new NotSupportedException();
/// <inheritdoc />
public override long Position
{
get => throw new NotSupportedException();
set => throw new NotSupportedException();
}
/// <inheritdoc />
public override void Flush()
{
// Not supported
}
/// <inheritdoc />
public override int Read(byte[] buffer, int offset, int count)
=> Read(buffer.AsSpan(offset, count));
/// <inheritdoc />
public override int Read(Span<byte> buffer)
{
int totalBytesRead = 0;
var stopwatch = Stopwatch.StartNew();
while (true)
{
totalBytesRead += _stream.Read(buffer);
if (StopReading(totalBytesRead, stopwatch.ElapsedMilliseconds))
{
break;
}
Thread.Sleep(50);
}
UpdateBytesWritten(totalBytesRead);
return totalBytesRead;
}
/// <inheritdoc />
public override async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
=> await ReadAsync(buffer.AsMemory(offset, count), cancellationToken).ConfigureAwait(false);
/// <inheritdoc />
public override async ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default)
{
int totalBytesRead = 0;
var stopwatch = Stopwatch.StartNew();
while (true)
{
totalBytesRead += await _stream.ReadAsync(buffer, cancellationToken).ConfigureAwait(false);
if (StopReading(totalBytesRead, stopwatch.ElapsedMilliseconds))
{
break;
}
await Task.Delay(50, cancellationToken).ConfigureAwait(false);
}
UpdateBytesWritten(totalBytesRead);
return totalBytesRead;
}
/// <inheritdoc />
public override long Seek(long offset, SeekOrigin origin)
=> throw new NotSupportedException();
/// <inheritdoc />
public override void SetLength(long value)
=> throw new NotSupportedException();
/// <inheritdoc />
public override void Write(byte[] buffer, int offset, int count)
=> throw new NotSupportedException();
/// <inheritdoc />
protected override void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
try
{
if (disposing)
{
_stream.Dispose();
if (_job is not null)
{
_transcodeManager?.OnTranscodeEndRequest(_job);
}
}
}
finally
{
_disposed = true;
base.Dispose(disposing);
}
}
private void UpdateBytesWritten(int totalBytesRead)
{
if (_job is not null)
{
_job.BytesDownloaded += totalBytesRead;
}
}
private bool StopReading(int bytesRead, long elapsed)
{
// It should stop reading when anything has been successfully read or if the job has exited
// If the job is null, however, it's a live stream and will require user action to close,
// but don't keep it open indefinitely if it isn't reading anything
return bytesRead > 0 || (_job?.HasExited ?? elapsed >= _timeoutMs);
}
}
|
