74 lines
2.5 KiB
C#
74 lines
2.5 KiB
C#
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using System;
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using System.IO;
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using System.Net;
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using System.Threading;
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using System.Threading.Tasks;
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namespace IPCamLib.Base
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{
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/// <summary>
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/// Abstract base class for IP cameras reading an HTTP stream.
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/// </summary>
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public abstract class BaseHTTPStreamCamera : ICamera
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{
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private readonly Uri streamUri;
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/// <param name="streamUri">The URI to the camera stream.
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/// Can include basic credentials in the standard 'username:password@' format.</param>
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protected BaseHTTPStreamCamera(Uri streamUri)
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{
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this.streamUri = streamUri;
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}
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/// <inheritdoc />
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public async Task Fetch(ICameraObserver observer, CancellationToken cancellationToken)
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{
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var request = WebRequest.CreateHttp(streamUri);
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if (!string.IsNullOrEmpty(streamUri.UserInfo))
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{
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var parts = streamUri.UserInfo.Split(':');
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request.Credentials = new NetworkCredential(parts[0], parts.Length > 1 ? parts[1] : "");
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}
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request.ReadWriteTimeout = (int)TimeSpan.FromMinutes(1).TotalMilliseconds;
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try
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{
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HttpWebResponse response;
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using (cancellationToken.Register(() => request.Abort(), false))
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{
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response = (HttpWebResponse)await request.GetResponseAsync();
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cancellationToken.ThrowIfCancellationRequested();
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}
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if (response.StatusCode != HttpStatusCode.OK)
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throw new WebException(response.StatusDescription);
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using var responseStream = response.GetResponseStream();
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await ReadFrames(observer, responseStream, cancellationToken);
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}
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catch (TaskCanceledException)
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{
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}
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finally
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{
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request.Abort();
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}
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}
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/// <summary>
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/// Implement in concrete descendants to continuously read frames from the HTTP stream.
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/// </summary>
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/// <param name="observer">The observer implementation passed to Fetch which should receive the decoded frames.</param>
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/// <param name="stream">The HTTP response stream.</param>
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/// <param name="cancellationToken">Stop reading frames when this token is cancelled.</param>
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protected abstract Task ReadFrames(ICameraObserver observer, Stream stream, CancellationToken cancellationToken);
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}
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}
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