public MSF.AudioBlock ParseAudioBlock(int offset, Stream _stream)
{
_stream.Seek(offset, SeekOrigin.Begin);
byte[] tmp = new byte[4];
MSF.AudioBlock ab = new MSF.AudioBlock();
_stream.Read(tmp, 0, 1);
ab.AudioFrameNum = (uint)BitTools.MaskBits(tmp, 0, 8);
ab.AudioBlockHeaderLength = ab.AudioFrameNum * 5 + 1;
uint addr = (uint)offset + ab.AudioBlockHeaderLength + CRC_Size;
for (int i = 0; i < ab.AudioFrameNum; i++)
{
//读音频参数集
MSF.AudioBlock.AudioFrame f = new MSF.AudioBlock.AudioFrame();
_stream.Read(tmp, 0, 2);
f.RelativeStartAddr = addr;
f.Length = (uint)BitTools.MaskBits(tmp, 0, 16);
// skip 音频流编号 和 保留
_stream.Seek(1, SeekOrigin.Current);
// 读相对时间
_stream.Read(tmp, 0, 2);
f.RelativeTime = BitTools.MaskBits(tmp, 0, 16) * timeUint;
// copy 音频流
//f._as = BitTools.CopyToNewStream(_stream, (long)f.RelativeStartAddr, (int)f.Length);
BitTools.CopyFromStreamToBytesArray(_stream, (long)f.RelativeStartAddr, (int)f.Length, ref f._data);
ab.aFrames.Add(f);
//下一段音频地址
addr += f.Length;
}
return(ab);
}
public MSF.VideoBlock ParseVideoBlock(int offset, Stream _stream)
{
_stream.Seek(offset, SeekOrigin.Begin);
byte[] tmp = new byte[4];
MSF.VideoBlock vb = new MSF.VideoBlock();
_stream.Read(tmp, 0, 2);
vb.VideoBlockHeaderLength = (uint)BitTools.MaskBits(tmp, 0, 12);
//计算有多少个视频帧, 每个视频参数集 5byte
vb.VideoFrameNum = vb.VideoBlockHeaderLength / 5;
uint addr = (uint)offset + vb.VideoBlockHeaderLength + CRC_Size;
for (int i = 0; i < vb.VideoFrameNum; i++)
{
MSF.VideoBlock.VideoFrame f = new MSF.VideoBlock.VideoFrame();
//本段视频的开始地址
f.RelativeStartAddr = addr;
// 视频段长度
_stream.Read(tmp, 0, 2);
f.Length = (uint)BitTools.MaskBits(tmp, 0, 16);
// 帧类型，I帧 or P帧
_stream.Read(tmp, 0, 1);
f.FrameMode = (uint)BitTools.MaskBits(tmp, 0, 3);
if (vb.FirstIFrameIdx == -1 && f.FrameMode == 0)
{
vb.FirstIFrameIdx = i;
}
// 相对播放时间
if (BitTools.MaskBits(tmp, 7, 1) == 1) //相对时间提示
{
_stream.Read(tmp, 0, 2);
f.RelativeTime = BitTools.MaskBits(tmp, 0, 16) * timeUint;
}
// 本段视频流
//f._vs = BitTools.CopyToNewStream(_stream, (long)f.RelativeStartAddr, (int)f.Length);
BitTools.CopyFromStreamToBytesArray(_stream, (long)f.RelativeStartAddr, (int)f.Length, ref f._data);
vb.vFrames.Add(f);
//下一段视频的开始地址
addr += f.Length;
}
ParseNALHeader(vb);
return(vb);
}
public MSFHeader ParseMSFHeader(int offset, Stream _stream)
{
_stream.Seek(offset, SeekOrigin.Begin);
byte[] tmp = new byte[4];
MSFHeader msfHeader = new MSFHeader();
_stream.Read(tmp, 0, 1);
msfHeader.Length = tmp[0];
_stream.Read(tmp, 0, 1);
msfHeader.VideoBlockIndicator = (uint)BitTools.MaskBits(tmp, 1, 1);
msfHeader.AudioBlockIndicator = (uint)BitTools.MaskBits(tmp, 2, 1);
msfHeader.DataBlockIndicator = (uint)BitTools.MaskBits(tmp, 3, 1);
msfHeader.ExtBlockIndicator = (uint)BitTools.MaskBits(tmp, 4, 1);
// 起始播放时间
if (BitTools.MaskBits(tmp, 0, 1) == 1)
{
_stream.Read(tmp, 0, 4);
msfHeader.PlayStartTime = BitTools.MaskBits(tmp, 0, 32) * timeUint;
}
// 视频段信息
if (msfHeader.VideoBlockIndicator == 1)
{
_stream.Read(tmp, 0, 3);
msfHeader.VideoBlockLenth = (uint)BitTools.MaskBits(tmp, 0, 21);
msfHeader.VideoBlockNum = (uint)BitTools.MaskBits(tmp, 21, 3);
}
//音频段信息
if (msfHeader.AudioBlockIndicator == 1)
{
_stream.Read(tmp, 0, 3);
msfHeader.AudioBlockLenth = (uint)BitTools.MaskBits(tmp, 0, 21);
msfHeader.AudioBlockNum = (uint)BitTools.MaskBits(tmp, 21, 3);
}
if (msfHeader.DataBlockIndicator == 1)
{
_stream.Seek(3, SeekOrigin.Current);
}
if (msfHeader.ExtBlockIndicator == 1)
{
_stream.Seek(3, SeekOrigin.Current);
}
// 跳过视频和音频参数集
return(msfHeader);
}
public void ParseServiceMultiplexConfigTable(int offset, Stream _stream)
{
// 开始解析复用配置表
_stream.Seek(offset, SeekOrigin.Begin);
_stream.Seek(3, SeekOrigin.Current);
// 读取Multiplex frame number, (6 bit)
byte[] tmp = new byte[4];
_stream.Read(tmp, 0, 1);
_msConfigTable = new ContinualServiceConfigTable();
_msConfigTable.mpFameNum = (uint)BitTools.MaskBits(tmp, 2, 6);
_msConfigTable.mfConfigTables = new List <MUXConfigTable>();
for (int i = 0; i < _msConfigTable.mpFameNum; i++)
{
//读取每个MF的信息配置表，RS, LDPC, mode
MUXConfigTable mftmp = new MUXConfigTable();
_stream.Read(tmp, 0, 1);
mftmp.RSCodec = (uint)BitTools.MaskBits(tmp, 6, 2);
_stream.Read(tmp, 0, 2);
mftmp.LDPC = (uint)BitTools.MaskBits(tmp, 2, 2);
mftmp.mode = (uint)BitTools.MaskBits(tmp, 4, 2);
mftmp.TS_num = (uint)BitTools.MaskBits(tmp, 10, 6);
_msConfigTable.mfConfigTables.Add(mftmp);
for (int j = 0; j < mftmp.TS_num; j++)
{
// skip 时隙号 和 保留，1 byte
_stream.Seek(1, SeekOrigin.Current);
}
//读复用子帧数
_stream.Read(tmp, 0, 1);
int subnumber = BitTools.MaskBits(tmp, 4, 4);
for (int m = 0; m < subnumber; m++)
{
// skip 子帧号，。。。3 bytes
_stream.Seek(3, SeekOrigin.Current);
}
}
// skip CRC_32
_stream.Seek(CRC_Size, SeekOrigin.Current);
}
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 bool ParseNALHeader(MSF.VideoBlock vb)
{
// Need to get the SPS and PPS of the stream, the first frame must be I frame, other frames cannot be played.
if (vb.FirstIFrameIdx == -1)
{
return(false);
}
//有I帧
byte[] tmp = new byte[32];
byte[] NALStartCode = new byte[] { 0x00, 0x00, 0x01 };
List <byte[]> nals = new List <byte[]>();
Stream s = new MemoryStream(); //vb.vFrames[vb.FirstIFrameIdx]._vs;
s.Write(vb.vFrames[vb.FirstIFrameIdx]._data, 0,
(int)vb.vFrames[vb.FirstIFrameIdx].Length);
s.Seek(0, SeekOrigin.Begin);
s.Read(tmp, 0, 3);
if (BitTools.FindBytePattern(tmp, NALStartCode) != 0)
{
return(false);
}
while (true)
{
long pos = s.Position;
s.Read(tmp, 0, 32);
int nextNALidx = BitTools.FindBytePattern(tmp, NALStartCode);
if (nextNALidx == -1)
{
break;
}
byte[] nal = new byte[nextNALidx];
BitTools.CopyToBytesArray(tmp, nal, nextNALidx);
nals.Add(nal);
// rollback pos
pos += nextNALidx + 3; //跳过下一个startcode
s.Seek(pos, SeekOrigin.Begin);
}
s.Close();
vb.FirstIFrameInfo = new MSF.VideoBlock.NAL_SPS_PPS_SEI();
foreach (var v in nals)
{
switch (v[0])
{
case 0x67: //SPS http://www.eefocus.com/czzheng/blog/11-09/230262_65ff0.html
vb.FirstIFrameInfo.sps = new byte[v.Length - 1];
BitTools.CopyToBytesArray(v, 1, vb.FirstIFrameInfo.sps, v.Length - 1);
break;
case 0x68: //PPS
vb.FirstIFrameInfo.pps = new byte[v.Length - 1];
BitTools.CopyToBytesArray(v, 1, vb.FirstIFrameInfo.pps, v.Length - 1);
break;
case 0x06: // SEI
vb.FirstIFrameInfo.sei = new byte[v.Length - 1];
BitTools.CopyToBytesArray(v, 1, vb.FirstIFrameInfo.sei, v.Length - 1);
break;
default:
break;
}
}
return(true);
}
