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);
}