public override bool Parse(AviParser parser)
{
// Call the Parse method of the parent to initialise the header and
// allow parsing the containing header if there is one.
if (!base.Parse(parser))
{
return(false);
}
FileType = parser.GetFourCC(Attribute.FileType); // 'AVI ' or 'AVIX'
return(Valid);
}
public override bool Parse(AviParser parser)
{
if (!base.Parse(parser))
{
return(false);
}
const int FrameSize = 4 * sizeof(short);
const int IntFieldCount = 11;
const int ShortFieldCount = 2;
const int ExpectedSize = IntFieldCount * sizeof(int) + ShortFieldCount * sizeof(short) + FrameSize;
// One sample had 8 bytes more.
// The assumption is made that the frame is written in four ints
// instead of in four shorts.
const int ExtraBytesAllowed = 8;
if ((Size < ExpectedSize) ||
(Size > ExpectedSize && Size <= ExpectedSize + ExtraBytesAllowed)) // invalidate the size attribute
{
parser.CheckAttribute(AviChunk.Attribute.Size, Size == ExpectedSize, false);
}
else if (Size > ExpectedSize + ExtraBytesAllowed) // invalidate the complete header
{
parser.CheckAttribute(AviChunk.Attribute.Size, Size == ExpectedSize, true);
}
if (parser.BytesRemaining >= 4)
{
StreamType = parser.GetFourCC(Attribute.StreamType);
}
if (parser.BytesRemaining >= 4)
{
Handler = parser.GetFourCC(Attribute.Handler);
}
if (parser.BytesRemaining >= 4)
{
parser.GetInt(Attribute.Flags);
}
// TODO parse flags
//
// AVISF_DISABLED = 0x00000001
// Indicates this stream should not be enabled by default
//
// AVISF_VIDEO_PALCHANGES = 0x00010000
// Indicates this video stream contains palette changes.
// This flag warns the playback software that it will need to
// animate the palette.
//
if (parser.BytesRemaining >= 2)
{
parser.GetShort(Attribute.Priority);
}
if (parser.BytesRemaining >= 2)
{
parser.GetShort(Attribute.Language);
}
if (parser.BytesRemaining >= 4)
{
parser.GetInt(Attribute.InitialFrames);
}
if (parser.BytesRemaining >= 4)
{
parser.GetInt(Attribute.Scale);
}
if (parser.BytesRemaining >= 4)
{
parser.GetInt(Attribute.Rate);
}
if (parser.BytesRemaining >= 4)
{
parser.GetInt(Attribute.Start);
}
if (parser.BytesRemaining >= 4)
{
parser.GetInt(Attribute.Length);
}
if (parser.BytesRemaining >= 4)
{
parser.GetInt(Attribute.SuggestedBufferSize);
}
if (parser.BytesRemaining >= 4)
{
parser.GetInt(Attribute.Quality);
}
if (parser.BytesRemaining >= 4)
{
parser.GetInt(Attribute.SampleSize);
}
if (Size == ExpectedSize)
{
if (parser.BytesRemaining >= 8)
{
parser.GetFrame(Attribute.Frame, FrameFieldType.Short);
}
}
else if (Size == ExpectedSize + 4 * sizeof(short))
{
if (parser.BytesRemaining >= 16)
{
parser.GetFrame(Attribute.Frame, FrameFieldType.Int);
}
}
return(Valid);
}