protected virtual int FindTSHeadFlag(byte[] data)
{
var ms = new MemoryStream(data);
TSProgramManage tsms = new TSProgramManage();
int pos = 0;
while (pos++ < data.Length)
{
var index = ms.Position;
if (ms.ReadByte() == 0x47)
{
int offset = (int)ms.Position - 1;
if (!CheckOffsetIsPacketFlag(data, offset))
{
continue;
}
ms.Seek(-1, SeekOrigin.Current);
byte[] buf = new byte[188];
ms.Read(buf, 0, buf.Length);
try {
TSPacket pack = new TSPacket()
{
ProgramManage = tsms
};
pack.SetBytes(buf);
pack.Decode();
ms.Seek(-188, SeekOrigin.Current);
return((int)ms.Position);
break;
} catch (Exception e) {
return(-1);
}
}
}
return(-1);
}
protected virtual void TSStreamResolveThread()
{
byte[] buffer_ts = new byte[188 * 2]; //两个包的空间，这里需要读取两个188字节的ts packet 而不是读取一个的原因是，
//读取两个，当可以检验前后ts packet标识字段是否为0x47，如果不是则当前位置不是处理ts packet的开头，
//则需要重新找到ts packet的头
byte[] part_ts = null;//当检测到当前ts packet错误的时候 part_ts用来保存正确的ts packet中的一部分
while (_isworking)
{
int readSize = 188 * 2 - (part_ts != null ? part_ts.Length : 0);//如果上一次没有残留数据则长度为 2个ts packet 的长度
if (_ioStream.Length >= readSize)
{
if (part_ts != null)
{
Array.Copy(part_ts, 0, buffer_ts, 0, part_ts.Length); //残留数据
}
_ioStream.Read(buffer_ts, buffer_ts.Length - readSize, readSize); //读取到缓冲区
if (buffer_ts[0] != 0x47)
{
//当前为非 ts packet的头，则找到下一个ts packet的头的偏移
int offset = FindTSHeadFlag(buffer_ts);
if (offset == -1)//没有找到头则返回起点
{
continue;
}
//从2*188字节中减去偏移，再减去一个ts packet的长度得到残余的数据长度
part_ts = new byte[buffer_ts.Length - 188 - offset];
Array.Copy(buffer_ts, offset + 188, part_ts, 0, part_ts.Length);
//新建一个临时的缓冲区，并将完整 的ts数据copy到这个临时缓冲区中
var tmp_buffer = new byte[188];
Array.Copy(buffer_ts, offset, tmp_buffer, 0, tmp_buffer.Length);
try {
TSPacket pack = new TSPacket()
{
ProgramManage = _tsms
};
pack.SetBytes(tmp_buffer);
pack.Decode();
if (pack.PacketType == TSPacketType.DATA)
{
pack.ProgramManage.WriteMediaTSPacket(pack);
}
} catch (Exception e) {
_DebugEx.Trace("TSStreamInput", "解析TS失败 1" + e.ToString());
}
}
else
{
//当前为 ts packet的头，则找到下一个ts packet的头的偏移
try {
//判断前后两个ts packet是否开头均正确
if (buffer_ts[0] == 0x47 && buffer_ts[188] == 0x47)
{
//将两个ts packet 分别解析
var tmp_buffer = new byte[188];
Array.Copy(buffer_ts, 0, tmp_buffer, 0, tmp_buffer.Length);
TSPacket pack = new TSPacket()
{
ProgramManage = _tsms
};
pack.SetBytes(tmp_buffer);
pack.Decode();
if (pack.PacketType == TSPacketType.DATA)
{
pack.ProgramManage.WriteMediaTSPacket(pack);
}
Array.Copy(buffer_ts, 188, tmp_buffer, 0, tmp_buffer.Length);
pack = new TSPacket()
{
ProgramManage = _tsms
};
pack.SetBytes(tmp_buffer);
pack.Decode();
if (pack.PacketType == TSPacketType.DATA)
{
pack.ProgramManage.WriteMediaTSPacket(pack);
}
}
else
{
_DebugEx.Trace("TSStreamInput", "TS Packet HeadFlag Error");
throw new Exception("TS Packet HeadFlag Error");
}
} catch (Exception e) {
_DebugEx.Trace("TSStreamInput", "解析TS失败 2" + e.ToString());
}
part_ts = null;
}
}
else
{
Thread.Sleep(10);
}
}
}
public static byte[] MediaFrame2TSData(MediaFrame frame, TSProgramManage pm)
{
var msOutput = new MemoryStream();
var pes = PESPacket.MediaFrame2PES(frame);
var pes_buffer = pes.GetBytes();
var msInput = new MemoryStream(pes_buffer);
int PID = frame.nIsAudio == 1 ? 257 : 258;
bool isFirstPack = true;
do
{
var payload_unit_start_indicator = 0;
var size = (int)(msInput.Length - msInput.Position);
var max_data_len = 188 - 4;//4B为包头长度
var data_len = 0;
AdaptationInfo ai = null;
if ((isFirstPack || size < max_data_len))
{
if (isFirstPack && (frame.nIsAudio == 0 || true))
{
max_data_len = 188 - 4 - 8; //5B为包头长度 8B为adaptation长度
data_len = Math.Min(max_data_len, size);
var adaptation_field_length = 188 - 4 - data_len - 1; //1B为adaptation的头，这1B不算在adaptation_field_length中
var pcr_bas = (frame.nTimetick - pm.FirstFrameTimeTick) * 90; //这里为什么是*45我也不知道，
ai = new AdaptationInfo()
{
adaptation_field_length = (byte)adaptation_field_length,
random_access_indicator = 1,
PCR_flag = 1,
PCR_base = pcr_bas,
};
payload_unit_start_indicator = 1;
}
else
{
max_data_len = 188 - 4 - 1;//4B为包头长度 8B为adaptation长度
if (size < max_data_len)
{
data_len = Math.Min(max_data_len, size);
var adaptation_field_length = 188 - 4 - data_len - 1;
ai = new AdaptationInfo();
ai.adaptation_field_length = (byte)adaptation_field_length;
}
else
{
payload_unit_start_indicator = 0;
data_len = size;
}
}
}
else
{
data_len = max_data_len;
}
byte[] data = new byte[data_len];
msInput.Read(data, 0, data.Length);
TSPacket pack_pat = new TSPacket()
{
sync_byte = 0x47,
transport_error_indicator = 0,
payload_unit_start_indicator = (byte)payload_unit_start_indicator,//一帧第一个packet或者这个packet需要fill字节时
transport_priority = 0,
PID = (ushort)PID,
transport_scrambling_control = 0,
adaptation_field_control = (byte)(ai != null ? 3 : 1),
continuity_counter = pm.GetCounter(PID),
AdaptationField = ai,
data = data
};
var buf = pack_pat.GetBytes();
msOutput.Write(buf, 0, buf.Length);
isFirstPack = false;
} while (msInput.Position < msInput.Length);
var result = msOutput.ToArray();
return(result);
}
public void WriteMediaTSPacket(TSPacket pack)
{
// Console.WriteLine(pack.PID);
var data = pack.data;
var newFrameFlag = data[0] == 0x0 && data[1] == 0x0 && data[2] == 0x1 && (data[3] == 0xE0 || data[3] == 0xC0);
MediaInfo mi = null;
lock (_dicMediaFrameCache) {
if (_dicMediaFrameCache.ContainsKey(pack.PID))
{
mi = _dicMediaFrameCache[pack.PID];
}
else
{
if (newFrameFlag)
{
_dicMediaFrameCache[pack.PID] = mi = new MediaInfo()
{
PID = pack.PID,
IsVideo = pack.data[3] == 0xE0,
IsAudio = pack.data[3] == 0xC0,
};
}
}
}
if (mi != null)
{
if (newFrameFlag)
{
lock (mi.TSPackets) {
if ((mi.IsAudio && pack.data[3] != 0xC0) || (mi.IsVideo && pack.data[3] != 0xE0))
{
lock (_dicMediaFrameCache) {
foreach (var item in _dicMediaFrameCache.Values)
{
item.Release();
}
_dicMediaFrameCache.Clear();
}
return;
}
var mediaFrame = mi.NextMediaFrame();
if (mediaFrame != null && mediaFrame.nSize == mediaFrame.Data.Length)
{
OnNewMediaFrame(mediaFrame);
}
mi.TSPackets.Clear();
mi.TSPackets.Add(pack);
}
}
else
{
lock (mi.TSPackets)
mi.TSPackets.Add(pack);
}
}
}
public static byte[] GetPMTPATData(bool isOnlyVideo = false)
{
if (_pmt_pat_tsdata == null)
{
var msOutput = new MemoryStream();
TSProgramManage ts_pm = new TSProgramManage();
TS_PAT pat = new TS_PAT();
var pat_data = pat.GetBytes();
TSPacket pack_pat = new TSPacket()
{
sync_byte = 0x47,
transport_error_indicator = 0,
payload_unit_start_indicator = 1,
transport_priority = 0,
PID = 0,
transport_scrambling_control = 0,
adaptation_field_control = 1,
continuity_counter = ts_pm.GetCounter(0),
data = pat_data,
};
var pack_pat_data = pack_pat.GetBytes();
var pack_pat_tmp = new TSPacket()
{
ProgramManage = ts_pm,
};
msOutput.Write(pack_pat_data, 0, pack_pat_data.Length);
//pack_pat_tmp.SetBytes(pack_pat_data);
//pack_pat_tmp.Decode();
TS_PMT pmt = new TS_PMT();
var pmt_data = isOnlyVideo ? pmt.GetVideoBytes() : pmt.GetBytes();
TSPacket pack_pmt = new TSPacket()
{
sync_byte = 0x47,
transport_error_indicator = 0,
payload_unit_start_indicator = 1,
transport_priority = 0,
PID = 256,//PMT_PID
transport_scrambling_control = 0,
adaptation_field_control = 1,
continuity_counter = ts_pm.GetCounter(256),
data = pmt_data,
};
var pack_pmt_data = pack_pmt.GetBytes();
var pack_pmt_tmp = new TSPacket()
{
ProgramManage = ts_pm,
};
msOutput.Write(pack_pmt_data, 0, pack_pmt_data.Length);
//pack_pmt_tmp.SetBytes(pack_pmt_data);
//pack_pmt_tmp.Decode();
var _out = msOutput.ToArray();
_pmt_pat_tsdata = _out;
}
return(_pmt_pat_tsdata);
}
