private void startFile()
{
_fileStartTime = _curStream.Time;
string streamName = $"{GlobalProcess.FileNameFromTime(_fileStartTime)}{GlobalProcess.RecFormat()}";
string indexesName = $"{GlobalProcess.FileNameFromTime(_fileStartTime)}{GlobalProcess.IndexesFormat()}";
updateFolderPath();
Directory.CreateDirectory(_curFolder);
_fsStream = newFileStream(streamName);
_fsIndexes = newFileStream(indexesName);
writeToVideoStream(_fileStartTime, DataType.SysHead, _header);
}
/// <summary>
/// 获取路径下指定时间点对应的视频流信息
/// </summary>
/// <param name="path"></param>
/// <param name="time"></param>
/// <returns></returns>
public static VideoStreamsPacket GetVideoStreamsPacket(string path, DateTime time)
{
string indexesFileName = null;
IndexesPacket indexesPacket = GetIndexesPacket(path, time, ref indexesFileName);
if (indexesPacket != null && indexesFileName != null)
{
string videoFile = GlobalProcess.GetRecFileName(indexesFileName);
StreamPacket[] streamPacket = FileManager.GetStreamPacket(videoFile, indexesPacket.StartIndex);
return(new VideoStreamsPacket(indexesPacket, streamPacket));
}
Logger.Default.Trace("{0} 未找到 {1} 对应的索引文件! {2}", path, time, indexesFileName);
return(null);
}
/// <summary>
/// 获取文件夹内所有简单索引文件中时间段列表
/// </summary>
/// <param name="folder">文件夹路径</param>
/// <returns>时间段列表</returns>
public static TimePeriodPacket[] GetTimePeriods(string folder)
{
List <TimePeriodPacket> list = new List <TimePeriodPacket>();
DirectoryInfo dir = new DirectoryInfo(folder);
FileInfo[] files = dir.GetFiles("*" + GlobalProcess.SimpleIndexesFormat());
foreach (var file in files)
{
var array = FileManager.GetTimePeriods(file.FullName);
if (array != null)
{
list.AddRange(array);
}
}
return(list.ToArray());
}
public static IndexesPacket GetIndexesPacket(string path, DateTime time, ref string fileName)
{
DirectoryInfo dirInfo = new DirectoryInfo(path);
if (dirInfo.Exists)
{
FileInfo[] files = dirInfo.GetFiles("*" + GlobalProcess.IndexesFormat());
string startStr = $"{GlobalProcess.FileNameFromTime(time)}{GlobalProcess.IndexesFormat()}";
var filesOrder = files.OrderBy(_ => _.Name).ToList();
FileInfo last = filesOrder.LastOrDefault(_ => string.Compare(_.Name, startStr) <= 0);
if (last == null)
{
return(null);
}
fileName = last.FullName;
return(FileManager.GetIndexesPacket(fileName, time));
}
return(null);
}
/// <summary>
/// 获取某文件夹下某段时间内首个视频头文件
/// </summary>
/// <param name="folder">文件夹路径</param>
/// <param name="beginTime">起始时间</param>
/// <param name="endTime">结束时间</param>
/// <returns>视频头</returns>
public static StreamPacket GetVideoHeader(string folder, DateTime beginTime, DateTime endTime)
{
StreamPacket header = null;
string[] files = GetIndexesFiles(folder);
if (files.Length > 0)
{
TimePeriodPacket validTi = new TimePeriodPacket(beginTime, endTime);
TimePeriodPacket[] tis = FolderManager.GetTimePeriods(folder);
if (TimePeriodManager.GetIntersections(tis, validTi).Length != 0)
{
foreach (var file in files)
{
header = FileManager.GetVideoHeader(GlobalProcess.GetRecFileName(file));
if (header != null)
{
break;
}
}
}
}
return(header);
}
