protected override int ReadFrameHeader()
{
if (Read8() != 'F' ||
Read8() != 'R' ||
Read8() != 'A' ||
Read8() != 'M' ||
Read8() != 'E')
{
throw new CorruptStreamException("Invalid frame signature.");
}
var c = Read8();
if (c != '\n' && c != ' ')
{
throw new CorruptStreamException("Malformed frame header.");
}
Width = _HeaderWidth;
Height = _HeaderHeight;
while (c != '\n')
{
c = Read8();
if (c == 'W')
{
var s = ReadParameter(out c);
if (ParseAssistant.TryParseIntegerValue(s, out var width))
{
Width = width;
}
else
{
throw new CorruptStreamException("Invalid frame header width.");
}
}
else if (c == 'H')
{
var s = ReadParameter(out c);
if (ParseAssistant.TryParseIntegerValue(s, out var height))
{
Height = height;
}
else
{
throw new CorruptStreamException("Invalid frame header height.");
}
}
else
{
var p = Utf8.Decode(new[] { (byte)c });
var s = ReadParameter(out c);
_Log.Warn(string.Format("Ignoring frame header parameter {0}{1}", p, s));
}
}
return(Width * Height * 3 / 2);
}
protected override void ReadStreamHeader()
{
// YUV4MPEG2
if (Read8() != 'Y' ||
Read8() != 'U' ||
Read8() != 'V' ||
Read8() != '4' ||
Read8() != 'M' ||
Read8() != 'P' ||
Read8() != 'E' ||
Read8() != 'G' ||
Read8() != '2')
{
throw new CorruptStreamException("Invalid stream signature.");
}
var c = Read8();
if (c != '\n' && c != ' ')
{
throw new CorruptStreamException("Malformed stream header.");
}
while (c != '\n')
{
c = Read8();
if (c == 'W')
{
var s = ReadParameter(out c);
if (!ParseAssistant.TryParseIntegerValue(s, out _HeaderWidth))
{
throw new CorruptStreamException("Invalid stream header width.");
}
}
else if (c == 'H')
{
var s = ReadParameter(out c);
if (!ParseAssistant.TryParseIntegerValue(s, out _HeaderHeight))
{
throw new CorruptStreamException("Invalid stream header height.");
}
}
else if (c == 'F')
{
var s = ReadParameter(out c);
var split = s.Split(':');
if (split.Length != 2)
{
throw new CorruptStreamException("Invalid stream header frame rate.");
}
if (!ParseAssistant.TryParseIntegerValue(split[0], out var num) ||
!ParseAssistant.TryParseIntegerValue(split[1], out var den))
{
throw new CorruptStreamException("Invalid stream header frame rate.");
}
_HeaderFrameRate = (double)num / den;
}
else if (c == 'I')
{
_HeaderInterlacing = ReadParameter(out c);
}
else if (c == 'A')
{
var s = ReadParameter(out c);
var split = s.Split(':');
if (split.Length != 2)
{
throw new CorruptStreamException("Invalid stream header pixel aspect ratio.");
}
if (!ParseAssistant.TryParseIntegerValue(split[0], out var num) ||
!ParseAssistant.TryParseIntegerValue(split[1], out var den))
{
throw new CorruptStreamException("Invalid stream header pixel aspect ratio.");
}
_HeaderPixelAspectRatio = (double)num / den;
}
else if (c == 'C')
{
_HeaderColourSpace = ReadParameter(out c);
}
else if (c == 'X')
{
_HeaderComment = ReadParameter(out c);
}
else
{
var p = Utf8.Decode(new[] { (byte)c });
var s = ReadParameter(out c);
_Log.Warn(string.Format("Ignoring stream header parameter {0}{1}", p, s));
}
}
// log details
var headerParams = new List <string>();
if (_HeaderWidth > 0)
{
headerParams.Add($"Width={_HeaderWidth}");
}
if (_HeaderHeight > 0)
{
headerParams.Add($"Height={_HeaderHeight}");
}
if (_HeaderFrameRate > 0)
{
headerParams.Add($"FrameRate={_HeaderFrameRate}");
}
if (_HeaderInterlacing != null)
{
headerParams.Add($"Interlacing={_HeaderInterlacing}");
}
if (_HeaderPixelAspectRatio > 0)
{
headerParams.Add($"PixelAspectRatio={_HeaderPixelAspectRatio}");
}
if (_HeaderColourSpace != null)
{
headerParams.Add($"ColourSpace={_HeaderColourSpace}");
}
if (_HeaderComment != null)
{
headerParams.Add($"Comment={_HeaderComment}");
}
_Log.Debug(Id, $"Stream Header => {string.Join(", ", headerParams)}");
}