public void Preview()
{
BITMAPINFOHEADER vidHdr = _aviReader.GetVideoStreamFormat(_aviReader.VideoStreamID);
_frameModifier.SetVideoInfo(vidHdr.biWidth, Math.Abs(vidHdr.biHeight),
AVIHelper.FourCC(vidHdr.biCompression));
Run(false);
_ranPreview = true;
}
private long StartList(string chunkID, string listType)
{
long offset = _fileOffset;
byte[] hdr = new byte[12];
_openLists.Push(offset);
BitConverterLE.WriteBytes(AVIHelper.FourCC(chunkID), hdr, 0);
BitConverterLE.WriteBytes((uint)0, hdr, 4);
BitConverterLE.WriteBytes(AVIHelper.FourCC(listType), hdr, 8);
_fs.Write(hdr, 0, 12);
_fileOffset += 12;
return(offset);
}
public static uint StreamFourCC(int streamID, string twoCC, bool twoCCFirst)
{
if ((streamID < 0) || (streamID > 255))
{
throw new Exception("Invalid stream ID.");
}
string sID, sFCC;
sID = streamID.ToString("X");
if (sID.Length == 1)
{
sID = "0" + sID;
}
sFCC = twoCCFirst ? twoCC + sID : sID + twoCC;
return(AVIHelper.FourCC(sFCC));
}
private long WriteChunk(string chunkID, uint length)
{
return(WriteChunk(AVIHelper.FourCC(chunkID), new byte[length]));
}
private long WriteChunk(string chunkID, byte[] data)
{
return(WriteChunk(AVIHelper.FourCC(chunkID), data));
}
private void ReadHeaders()
{
uint chunkID, dataSize, listType;
long chunkOffset, firstRIFFEnd, moviEnd;
byte[] data;
bool inMOVI;
moviEnd = -1;
chunkOffset = ReadChunkHeader(out chunkID, out dataSize, out listType);
if ((chunkOffset == -1) || (chunkID != AVIHelper.FourCC("RIFF")) ||
(listType != AVIHelper.FourCC("AVI ")))
{
throw new Exception("File isn't an AVI.");
}
firstRIFFEnd = _fileOffset + dataSize;
while (_fileOffset < firstRIFFEnd)
{
chunkOffset = ReadChunkHeader(out chunkID, out dataSize, out listType);
if (chunkOffset == -1)
{
break;
}
if (chunkID == ckIDLIST)
{
if (listType == AVIHelper.FourCC("movi"))
{
if (_videoStreamID == -1)
{
throw new Exception("Video stream not found.");
}
_moviOffset = chunkOffset;
moviEnd = _fileOffset + dataSize;
}
continue;
}
inMOVI = (_moviOffset != -1) && (chunkOffset >= _moviOffset) && (chunkOffset < moviEnd);
if (!inMOVI)
{
data = ReadChunkData(dataSize);
if (data.Length < dataSize)
{
break;
}
}
else
{
SkipChunkData(dataSize);
data = null;
}
if (chunkID == AVIHelper.FourCC("strh"))
{
AVISTREAMHEADER strH = StructHelper <AVISTREAMHEADER> .FromBytes(data, 0, false);
AVIStream s;
if (strH.fccType == AVIHelper.FourCC("vids"))
{
s = new AVIStream(AVIStreamType.Video);
if (_videoStreamID == -1)
{
_videoStreamID = _streamList.Count;
}
}
else if (strH.fccType == AVIHelper.FourCC("auds"))
{
s = new AVIStream(AVIStreamType.Audio);
}
else
{
s = new AVIStream(AVIStreamType.Other);
}
s.Header = strH;
_streamList.Add(s);
}
if (chunkID == AVIHelper.FourCC("strf"))
{
AVIStream stream = _streamList[_streamList.Count - 1];
int fmtSize = 0;
int fmtExtraSize;
if (stream.Type == AVIStreamType.Video)
{
stream.VideoFormat = StructHelper <BITMAPINFOHEADER> .FromBytes(data, 0, false);
fmtSize = StructHelper <BITMAPINFOHEADER> .SizeOf;
}
else if (stream.Type == AVIStreamType.Audio)
{
stream.AudioFormat = StructHelper <WAVEFORMATEX> .FromBytes(data, 0, false);
fmtSize = StructHelper <WAVEFORMATEX> .SizeOf;
}
else
{
fmtSize = 0;
}
fmtExtraSize = data.Length - fmtSize;
if (fmtExtraSize > 0)
{
stream.FormatExtra = new byte[fmtExtraSize];
Buffer.BlockCopy(data, fmtSize, stream.FormatExtra, 0, fmtExtraSize);
}
}
if (chunkID == AVIHelper.FourCC("strn"))
{
_streamList[_streamList.Count - 1].STRNData = data;
}
if (inMOVI && (AVIHelper.StreamID(chunkID, false) == _videoStreamID))
{
_firstVideoChunkOffset = chunkOffset;
Seek(moviEnd);
}
if (chunkID == AVIHelper.FourCC("indx"))
{
_isOpenDML = true;
_foundIndex = ParseOpenDMLIndex(data);
}
if (chunkID == AVIHelper.FourCC("idx1"))
{
if (!_isOpenDML)
{
ParseOldIndex(data);
_foundIndex = true;
}
}
}
if (_moviOffset == -1)
{
throw new Exception("\"movi\" list not found.");
}
SeekToStart();
}