/// <summary>
/// 获取gb28181设备实时流的ssrc信息
/// </summary>
/// <param name="deivceId"></param>
/// <param name="channelId"></param>
/// <returns>第一返回是用于sip推流的ssrc,第二个返回是用于zlm的streamid</returns>
public static KeyValuePair <string, string> GetSSRCInfo(string deivceId, string channelId)
{
var tag = "0" + channelId.Substring(3, 5) +
deivceId + channelId;
var crc32 = CRC32Helper.GetCRC32(tag);
var crc32Str = crc32.ToString().PadLeft(10, '0');
char[] tmpChars = crc32Str.ToCharArray();
tmpChars[0] = '0'; //实时流ssrc第一位是0
string ssrcid = new string(tmpChars);
return(new KeyValuePair <string, string>(ssrcid, string.Format("{0:X8}", uint.Parse(ssrcid))));
}
/// <summary>
/// 非gb28181设备的streamid计算
/// </summary>
/// <param name="videoSrcUrl"></param>
/// <returns></returns>
public static string GetDisGB28181VideoChannelMainId(string videoSrcUrl)
{
var crc32 = CRC32Helper.GetCRC32(videoSrcUrl.ToUpper().Trim());
return(string.Format("{0:X8}", crc32));
}