/// <summary>
/// Tries to parse the JFIF APP0 header
/// See http://en.wikipedia.org/wiki/JFIF
/// </summary>
private bool TryParseJFIF(byte[] data)
{
IO.BinaryReader reader = new IO.BinaryReader(new MemoryStream(data));
int length = data.Length + 2; // Data & length
if (!(length >= JFIF_FIXED_LENGTH))
{
return(false); // Header's too small.
}
byte[] identifier = new byte[5];
reader.Read(identifier, 0, identifier.Length);
if (identifier[0] != JPEGMarker.JFIF_J ||
identifier[1] != JPEGMarker.JFIF_F ||
identifier[2] != JPEGMarker.JFIF_I ||
identifier[3] != JPEGMarker.JFIF_F ||
identifier[4] != JPEGMarker.X00)
{
return(false); // Incorrect bytes
}
majorVersion = reader.ReadByte();
minorVersion = reader.ReadByte();
if (majorVersion != MAJOR_VERSION ||
(majorVersion == MAJOR_VERSION &&
minorVersion > MINOR_VERSION)) // changed from <
{
return(false); // Unsupported version
}
Units = (UnitType)reader.ReadByte();
if (Units != UnitType.None &&
Units != UnitType.Inches &&
Units != UnitType.Centimeters)
{
return(false); // Invalid units
}
XDensity = reader.ReadShort();
YDensity = reader.ReadShort();
Xthumbnail = reader.ReadByte();
Ythumbnail = reader.ReadByte();
// 3 * for RGB data
int thumbnailLength = 3 * Xthumbnail * Ythumbnail;
if (length > JFIF_FIXED_LENGTH &&
thumbnailLength != length - JFIF_FIXED_LENGTH)
{
return(false); // Thumbnail fields invalid
}
if (thumbnailLength > 0)
{
thumbnail = new byte[thumbnailLength];
if (reader.Read(thumbnail, 0, thumbnailLength) != thumbnailLength)
{
return(false); // Thumbnail data was missing!
}
}
return(true);
}
public void Read(IO.BinaryReader br)
{
var _with1 = br;
m_FormatTag = _with1.ReadInt16;
m_nChannels = _with1.ReadInt16;
m_SamplesPerSecond = _with1.ReadInt32;
m_AvgBytesPerSecond = _with1.ReadInt32;
m_BlockAlign = _with1.ReadInt16;
m_BitsPerSample = _with1.ReadInt16;
}
private void ParseFmt(Riff.RiffReader reader)
{
Ibasa.IO.BinaryReader binreader = new IO.BinaryReader(reader.Data);
FormatTag tag;
int channels, bytesPerSecond, blockAlignment, bitsPerSample, size;
if (reader.Length < 16)
{
throw new System.IO.InvalidDataException("Invalid fmt chunk.");
}
else
{
tag = (FormatTag)binreader.ReadInt16();
channels = binreader.ReadInt16();
Frequency = binreader.ReadInt32();
bytesPerSecond = binreader.ReadInt32();
blockAlignment = binreader.ReadInt16();
bitsPerSample = binreader.ReadInt16();
}
if (reader.Length >= 18)
{
size = binreader.ReadInt16();
}
if (tag == FormatTag.Pcm)
{
if (bitsPerSample == 8)
{
Format = new Ibasa.SharpAL.Formats.Pcm8(channels);
}
else if (bitsPerSample == 16)
{
Format = new Ibasa.SharpAL.Formats.Pcm16(channels);
}
else
{
throw new NotSupportedException(string.Format("PCM {0} bit data is not supported.", bitsPerSample));
}
}
else
{
throw new NotSupportedException(string.Format("{0} is not supported.", tag));
}
}
