public List <MUX> ParseEntireMUX(Stream currentStream)
{
List <MUX> muxs = new List <MUX>();
MultiplexFrameHeader _mf1ConfigHeader = ParseMultiplexFrameHeader(0, currentStream);
// 解析 控制帧
int offset = SearchServiceMultiplexConfigTable(currentStream, _mf1ConfigHeader);
if (offset != -1)
{
ParseServiceMultiplexConfigTable(offset, currentStream);
}
// fill the MF length
foreach (var v in _msConfigTable.mfConfigTables)
{
uint len = MFLengthLookupTable(v);
v.Length = len;
}
// 初始化结束，开始解视频帧
uint offset2 = _msConfigTable.mfConfigTables[0].Length + _msConfigTable.mfConfigTables[1].Length;
for (int i = 2; i < _msConfigTable.mpFameNum; i++)
{
uint offset3 = offset2;
MUX mux = new MUX();
mux.stream = currentStream;
// 从第二个复用帧开始
mux.muxHeader = ParseMultiplexFrameHeader((int)offset3, currentStream);
offset3 += mux.muxHeader.headerLength + CRC_Size;
mux.msf = new MSF();
mux.msf.msfHeader = ParseMSFHeader((int)offset3, currentStream);
// 解析视频段’
offset3 += mux.msf.msfHeader.Length + CRC_Size;
mux.msf.videoBlock = ParseVideoBlock((int)offset3, currentStream);
//TODO 解析 音频段
offset3 += mux.msf.msfHeader.VideoBlockLenth;
mux.msf.audioBlock = ParseAudioBlock((int)offset3, currentStream);
// the next
muxs.Add(mux);
offset2 += _msConfigTable.mfConfigTables[i].Length;
}
return(muxs);
}
public int SearchServiceMultiplexConfigTable(Stream s, MultiplexFrameHeader _mf1ConfigHeader)
{
//定位持续业务复用配置表
int MFHeaderOffset = 0;
byte[] tmp = new byte[4];
//非业务复用帧
if (_mf1ConfigHeader.MD_ID != 0)
{
return(-1);
}
//复用帧头长度
MFHeaderOffset = (int)_mf1ConfigHeader.headerLength + CRC_Size;
s.Seek(MFHeaderOffset, SeekOrigin.Begin);
int offset = 0;
bool re = false;
//读取每个控制表的标示号（1byte），寻找 持续业务复用配置表
for (int i = 0; i < _mf1ConfigHeader.subFrameNum; i++)
{
s.Read(tmp, 0, 1);
s.Seek(-1, SeekOrigin.Current);
if (tmp[0] == 0x02)
{
re = true;
break;
}
else
{
offset += _mf1ConfigHeader.subFrameLength[i];
s.Seek(offset, SeekOrigin.Current);
}
}
if (re)
{
return(offset + MFHeaderOffset);
}
else
{
return(-1);
}
}
public MultiplexFrameHeader ParseMultiplexFrameHeader(int offset, Stream _stream)
{
_stream.Seek(offset, SeekOrigin.Begin);
byte[] tmp = new byte[4];
int r = _stream.Read(tmp, 0, 4); // read the start code,
if (r != 4)
{
return(null);
}
if (BitTools.FindBytePattern(tmp, frameStartCode) != 0)
{
return(null); // start code not match, return
}
MultiplexFrameHeader mfHeader = new MultiplexFrameHeader();
mfHeader.startAddr = 0x0;
// parse frame header length 1 byte.
_stream.Read(tmp, 0, 1);
mfHeader.headerLength = tmp[0];
// 再读两个字节，协议版本号5 bit, 最低版本号5 bit, 复用帧标示 6 bit
_stream.Read(tmp, 0, 2);
mfHeader.MD_ID = (uint)BitTools.MaskBits(tmp, 10, 6);
// 跳过4个字节， 包括从紧急广播提示-ESG更新序列号
_stream.Seek(4, SeekOrigin.Current);
// 读一个字节，取出 subFrame number (4 bit)
_stream.Read(tmp, 0, 1);
mfHeader.subFrameNum = (uint)BitTools.MaskBits(tmp, 4, 4);
//读取子帧长度 （3 byte）
mfHeader.subFrameLength = new int[mfHeader.subFrameNum];
for (int i = 0; i < mfHeader.subFrameNum; i++)
{
_stream.Read(tmp, 0, 3);
mfHeader.subFrameLength[i] = BitTools.MaskBits(tmp, 0, 24);
}
return(mfHeader);
}
public int SearchServiceMultiplexConfigTable(Stream s, MultiplexFrameHeader _mf1ConfigHeader)
{
//定位持续业务复用配置表
int MFHeaderOffset = 0;
byte[] tmp = new byte[4];
//非业务复用帧
if (_mf1ConfigHeader.MD_ID != 0)
return -1;
//复用帧头长度
MFHeaderOffset = (int)_mf1ConfigHeader.headerLength + CRC_Size;
s.Seek(MFHeaderOffset, SeekOrigin.Begin);
int offset = 0;
bool re = false;
//读取每个控制表的标示号（1byte），寻找 持续业务复用配置表
for (int i = 0; i < _mf1ConfigHeader.subFrameNum; i++)
{
s.Read(tmp, 0, 1);
s.Seek(-1, SeekOrigin.Current);
if (tmp[0] == 0x02)
{
re = true;
break;
}
else
{
offset += _mf1ConfigHeader.subFrameLength[i];
s.Seek(offset, SeekOrigin.Current);
}
}
if (re)
return offset + MFHeaderOffset;
else
return -1;
}
public MultiplexFrameHeader ParseMultiplexFrameHeader(int offset, Stream _stream)
{
_stream.Seek(offset, SeekOrigin.Begin);
byte[] tmp = new byte[4];
int r = _stream.Read(tmp, 0, 4); // read the start code,
if (r !=4)
return null;
if (BitTools.FindBytePattern(tmp, frameStartCode) != 0)
return null; // start code not match, return
MultiplexFrameHeader mfHeader = new MultiplexFrameHeader();
mfHeader.startAddr = 0x0;
// parse frame header length 1 byte.
_stream.Read(tmp, 0, 1);
mfHeader.headerLength = tmp[0];
// 再读两个字节，协议版本号5 bit, 最低版本号5 bit, 复用帧标示 6 bit
_stream.Read(tmp, 0, 2);
mfHeader.MD_ID = (uint)BitTools.MaskBits(tmp, 10, 6);
// 跳过4个字节， 包括从紧急广播提示-ESG更新序列号
_stream.Seek(4, SeekOrigin.Current);
// 读一个字节，取出 subFrame number (4 bit)
_stream.Read(tmp, 0, 1);
mfHeader.subFrameNum = (uint)BitTools.MaskBits(tmp, 4, 4);
//读取子帧长度 （3 byte）
mfHeader.subFrameLength = new int[mfHeader.subFrameNum];
for (int i = 0; i < mfHeader.subFrameNum; i++)
{
_stream.Read(tmp, 0, 3);
mfHeader.subFrameLength[i] = BitTools.MaskBits(tmp, 0, 24);
}
return mfHeader;
}
