private void MakeOpenDMLIndexes()
{
for (int iStream = 0; iStream < _streamList.Count; iStream++)
{
const byte AVI_INDEX_OF_INDEXES = 0x00;
AVIStream stream = _streamList[iStream];
List <StreamChunkInfo> chunkList = stream.ChunkList;
AVISUPERINDEX header = new AVISUPERINDEX();
AVISUPERINDEXENTRY entry;
int entriesPerChunk, entryOffset, chunksLeft, buffPos;
uint indexChunkID = AVIHelper.StreamFourCC(AVIHelper.StreamID(stream.FourCC, false), "ix", true);
byte[] buff;
buffPos = 0;
buff = new byte[OpenDMLSuperIndexSize(MaxOpenDMLSuperIndexEntries)];
entriesPerChunk = (int)CalculateOpenDMLStandardIndexEntryCount(chunkList);
entryOffset = 0;
chunksLeft = chunkList.Count;
header.wLongsPerEntry = 4;
header.bIndexSubType = 0;
header.bIndexType = AVI_INDEX_OF_INDEXES;
header.nEntriesInUse = (uint)((chunksLeft + (entriesPerChunk - 1)) / entriesPerChunk);
header.dwChunkID = stream.FourCC;
if (header.nEntriesInUse > MaxOpenDMLSuperIndexEntries)
{
throw new Exception("Too many super-index entries.");
}
buffPos += StructHelper <AVISUPERINDEX> .ToBytes(header, buff, buffPos, false);
while (chunksLeft > 0)
{
int length = Math.Min(entriesPerChunk, chunksLeft);
byte[] tmp = MakeOpenDMLStandardIndexChunk(chunkList, entryOffset, length,
stream.FourCC);
CheckExtend((uint)tmp.Length);
entry.qwOffset = (ulong)WriteChunk(indexChunkID, tmp);
entry.dwSize = (uint)tmp.Length + 8;
entry.dwDuration = (stream.Type == AVIStreamType.Video) ? (uint)length :
CalculateDuration(chunkList, entryOffset, length);
BitConverterLE.WriteBytes(entry.qwOffset, buff, buffPos);
BitConverterLE.WriteBytes(entry.dwSize, buff, buffPos + 8);
BitConverterLE.WriteBytes(entry.dwDuration, buff, buffPos + 12);
buffPos += 16;
entryOffset += length;
chunksLeft -= length;
}
stream.OpenDMLSuperIndex = buff;
}
}
private void ParseOldIndex(byte[] data)
{
const uint AVIIF_KEYFRAME = 0x10;
int dataPos = 0;
StreamChunkInfo chunkInfo = new StreamChunkInfo();
AVIOLDINDEXENTRY entry;
int streamID;
long firstVideoChunkOffset = -1;
long offsetCorrection;
while (dataPos <= (data.Length - 16))
{
entry.dwChunkID = BitConverterLE.ToUInt32(data, dataPos);
entry.dwFlags = BitConverterLE.ToUInt32(data, dataPos + 4);
entry.dwOffset = BitConverterLE.ToUInt32(data, dataPos + 8);
entry.dwSize = BitConverterLE.ToUInt32(data, dataPos + 12);
dataPos += 16;
streamID = AVIHelper.StreamID(entry.dwChunkID, false);
if ((streamID == -1) || (streamID >= _streamList.Count))
{
continue;
}
if (_streamList[streamID].FourCC == 0)
{
_streamList[streamID].FourCC = entry.dwChunkID;
}
chunkInfo.Offset = (long)entry.dwOffset;
chunkInfo.Size = entry.dwSize;
chunkInfo.IsKeyFrame = (entry.dwFlags & AVIIF_KEYFRAME) != 0;
if ((firstVideoChunkOffset == -1) && (streamID == _videoStreamID))
{
firstVideoChunkOffset = chunkInfo.Offset;
}
_streamList[streamID].ChunkList.Add(chunkInfo);
}
if ((_firstVideoChunkOffset == -1) || (firstVideoChunkOffset == -1))
{
throw new Exception("Video stream not found.");
}
// Add 8 because the offset needs to point to the start of the data
offsetCorrection = (_firstVideoChunkOffset - firstVideoChunkOffset) + 8;
foreach (AVIStream stream in _streamList)
{
for (int i = 0; i < stream.ChunkList.Count; i++)
{
chunkInfo = stream.ChunkList[i];
chunkInfo.Offset += offsetCorrection;
stream.ChunkList[i] = chunkInfo;
}
}
}
private void ParseOpenDMLStandardIndex(byte[] data)
{
AVISTDINDEX header;
AVISTDINDEXENTRY entry;
int dataPos = 0;
int streamID;
List <StreamChunkInfo> chunkList;
StreamChunkInfo ci = new StreamChunkInfo();
header = StructHelper <AVISTDINDEX> .FromBytes(data, 0, false);
dataPos += StructHelper <AVISTDINDEX> .SizeOf;
streamID = AVIHelper.StreamID(header.dwChunkID, false);
if ((streamID == -1) || (streamID >= _streamList.Count))
{
throw new Exception("Invalid chunk ID in OpenDML standard index.");
}
if (_streamList[streamID].FourCC == 0)
{
_streamList[streamID].FourCC = header.dwChunkID;
}
chunkList = _streamList[streamID].ChunkList;
while (dataPos <= (data.Length - 8))
{
if (header.nEntriesInUse == 0)
{
break;
}
entry.dwOffset = BitConverterLE.ToUInt32(data, dataPos);
entry.dwSize = BitConverterLE.ToUInt32(data, dataPos + 4);
dataPos += 8;
ci.Offset = (long)(header.qwBaseOffset + entry.dwOffset);
ci.Size = entry.dwSize & 0x7FFFFFFF;
ci.IsKeyFrame = ((entry.dwSize & 0x80000000) == 0);
chunkList.Add(ci);
header.nEntriesInUse--;
}
}
private bool NextChunkByMOVI(out int streamID, out StreamChunkInfo chunkInfo)
{
uint chunkID, dataSize, listType;
streamID = -1;
chunkInfo = new StreamChunkInfo();
Seek(_nextChunkOffset);
while (true)
{
chunkInfo.Offset = ReadChunkHeader(out chunkID, out dataSize, out listType);
if (chunkInfo.Offset == -1)
{
return(false);
}
chunkInfo.Offset += 8;
if ((chunkID == ckIDLIST) || (chunkID == ckIDRIFF))
{
continue;
}
streamID = AVIHelper.StreamID(chunkID, false);
if ((streamID != -1) && (streamID < _streamList.Count))
{
if (_streamList[streamID].FourCC == 0)
{
_streamList[streamID].FourCC = chunkID;
}
chunkInfo.Size = dataSize;
chunkInfo.IsKeyFrame = _streamList[streamID].IsFirstChunk ||
(_streamList[streamID].Type != AVIStreamType.Video);
_streamList[streamID].IsFirstChunk = false;
_nextChunkOffset = _fileOffset + ((dataSize + 1) & 0xFFFFFFFE);
return(true);
}
SkipChunkData(dataSize);
}
}
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();
}