/// <summary>获取某通道视频在某时间点对应文件的视频头</summary>
public static StreamPacket GetVideoHeader(string videoId, int streamId, DateTime time)
{
string indexesFile = null;
string path = getPath(videoId, streamId, time);
IndexesPacket packet = FolderManager.GetIndexesPacket(path, time, ref indexesFile);
if (packet != null)
{
return(FileManager.GetVideoHeader(GlobalProcess.GetRecFileName(indexesFile)));
}
return(null);
}
public void TestIndexesData＿IndexesPacket()
{
DateTime beginTime = new DateTime(2020, 1, 2, 3, 4, 5, 6);
DateTime endTime = new DateTime(2026, 5, 4, 3, 2, 1, 9);
long beginIndex = 10000;
IndexesPacket iData = new IndexesPacket(beginTime, endTime, beginIndex);
byte[] buffer = IndexesPacket.Encode(iData);
IndexesPacket newData = IndexesPacket.Decode(buffer);
Assert.AreNotSame(iData, newData);
Assert.AreEqual(iData.BeginTime, newData.BeginTime);
Assert.AreEqual(iData.EndTime, newData.EndTime);
Assert.AreEqual(iData.StartIndex, newData.StartIndex);
}
static long getSize(FileInfo fileInfo, DateTime beginTime, DateTime endTime, int headerLength)
{
long size = 0;
try
{
string indexes = GlobalProcess.GetIndexesFileName(fileInfo.FullName);
var indexesPackets = FileManager.GetIndexesPackets(indexes);
IndexesPacket first = indexesPackets.FirstOrDefault(_ => _.EndTime >= beginTime);
if (first != null)
{
long beginIndex = first.StartIndex;
long endIndex = fileInfo.Length;
IndexesPacket end = indexesPackets.FirstOrDefault(_ => _.BeginTime >= endTime);
if (end != null)
{
endIndex = end.StartIndex;
}
size = endIndex - beginIndex;
}
}
catch { }
return(size);
}
