/// <summary>
/// 分析amf文件头部
/// </summary>
/// <param name="header">文件头字符数组</param>
/// <returns></returns>
public static AmfHeadInfo AnalyzeFileHeader(Byte[] header)
{
try
{
if (header.Length != 76)
return null;
System.IO.MemoryStream ms = new System.IO.MemoryStream(header);
var temp = new AmfHeadInfo
{
Format = AmfTools.Byte2String(ms.ReadBytesExtend(0, 4)),
FileSize = AmfTools.ConvertToInt32(header, 4) + 8,
AudioFlag = AmfTools.SubArray(header, 8, 4),
AudioHeadSize = AmfTools.ConvertToInt32(header, 12),
AudioCodec = new Char4 { Value = AmfTools.Byte2String(ms.ReadBytesExtend(16, 4)) },//AmfTools.SubArray(header,16,4)},
AudioBitRate = AmfTools.ConvertToInt32(header, 20),
ChannelCount = AmfTools.ConvertToInt32(header, 24),
SamplingRate = AmfTools.ConvertToInt32(header, 28),
SamplingTime = AmfTools.ConvertToInt32(header, 32),
AudioFrameCount = AmfTools.ConvertToInt32(header, 36),
VideoFlag = AmfTools.SubArray(header, 40, 4),
VideoHeadSize = AmfTools.ConvertToInt32(header, 44),
VideoCodec = new Char4 { Value = AmfTools.Byte2String(ms.ReadBytesExtend(48, 4)) },//AmfTools.SubArray(header, 48, 4),
Width = AmfTools.ConvertToInt32(header, 52),
Height = AmfTools.ConvertToInt32(header, 56),
VideoFrameRate = AmfTools.ConvertToInt32(header, 60),
VideoFrameCount = AmfTools.ConvertToInt32(header, 64),
DataBlockFlag = AmfTools.SubArray(header, 68, 4),
DataSize = AmfTools.ConvertToInt32(header, 72)
};
ms.Close();
return temp;
}
catch
{
throw;
}
}
