BililiveRecorder/BililiveRecorder.Flv/Pipeline/Rules/CheckDiscontinuityRule.cs

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2021-02-08 16:51:19 +08:00
using System;
using System.Threading.Tasks;
namespace BililiveRecorder.Flv.Pipeline.Rules
{
/// <summary>
/// 检查分块内时间戳问题
/// </summary>
/// <remarks>
/// 到目前为止还未发现有在一个 GOP 内出现时间戳异常问题<br/>
/// 本规则是为了预防实际使用中遇到意外情况<br/>
/// <br/>
/// 本规则应该放在所有规则前面
/// </remarks>
public class CheckDiscontinuityRule : ISimpleProcessingRule
{
private const int MAX_ALLOWED_DIFF = 1000 * 10; // 10 seconds
public Task RunAsync(FlvProcessingContext context, Func<Task> next)
{
if (context.OriginalInput is PipelineDataAction data)
{
for (var i = 0; i < data.Tags.Count - 1; i++)
{
var f1 = data.Tags[i];
var f2 = data.Tags[i + 1];
if (f1.Timestamp > f2.Timestamp)
{
context.ClearOutput();
context.AddDisconnectAtStart();
context.AddComment("Flv Chunk 内出现时间戳跳变(变小)");
return Task.CompletedTask;
}
else if ((f2.Timestamp - f1.Timestamp) > MAX_ALLOWED_DIFF)
{
context.ClearOutput();
context.AddDisconnectAtStart();
context.AddComment("Flv Chunk 内出现时间戳跳变(间隔过大)");
return Task.CompletedTask;
}
}
return next();
}
else return next();
}
}
}