public static void Scan(
TSVideoStream stream,
TSStreamBuffer buffer,
ref string tag)
{
int parse = 0;
int pictureParse = 0;
int sequenceHeaderParse = 0;
int extensionParse = 0;
int sequenceExtensionParse = 0;
for (int i = 0; i < buffer.Length; i++)
{
parse = (parse << 8) + buffer.ReadByte();
if (parse == 0x00000100)
{
pictureParse = 2;
}
else if (parse == 0x000001B3)
{
sequenceHeaderParse = 7;
}
else if (sequenceHeaderParse > 0)
{
--sequenceHeaderParse;
switch (sequenceHeaderParse)
{
#if DEBUG
case 6:
break;
case 5:
break;
case 4:
stream.Width =
(int)((parse & 0xFFF000) >> 12);
stream.Height =
(int)(parse & 0xFFF);
break;
case 3:
stream.AspectRatio =
(TSAspectRatio)((parse & 0xF0) >> 4);
switch ((parse & 0xF0) >> 4)
{
case 0: // Forbidden
break;
case 1: // Square
break;
case 2: // 4:3
break;
case 3: // 16:9
break;
case 4: // 2.21:1
break;
default: // Reserved
break;
}
switch (parse & 0xF)
{
case 0: // Forbidden
break;
case 1: // 23.976
stream.FrameRateEnumerator = 24000;
stream.FrameRateDenominator = 1001;
break;
case 2: // 24
stream.FrameRateEnumerator = 24000;
stream.FrameRateDenominator = 1000;
break;
case 3: // 25
stream.FrameRateEnumerator = 25000;
stream.FrameRateDenominator = 1000;
break;
case 4: // 29.97
stream.FrameRateEnumerator = 30000;
stream.FrameRateDenominator = 1001;
break;
case 5: // 30
stream.FrameRateEnumerator = 30000;
stream.FrameRateDenominator = 1000;
break;
case 6: // 50
stream.FrameRateEnumerator = 50000;
stream.FrameRateDenominator = 1000;
break;
case 7: // 59.94
stream.FrameRateEnumerator = 60000;
stream.FrameRateDenominator = 1001;
break;
case 8: // 60
stream.FrameRateEnumerator = 60000;
stream.FrameRateDenominator = 1000;
break;
default: // Reserved
stream.FrameRateEnumerator = 0;
stream.FrameRateDenominator = 0;
break;
}
break;
case 2:
break;
case 1:
break;
#endif
case 0:
#if DEBUG
stream.BitRate =
(((parse & 0xFFFFC0) >> 6) * 200);
#endif
stream.IsVBR = true;
stream.IsInitialized = true;
break;
}
}
else if (pictureParse > 0)
{
--pictureParse;
if (pictureParse == 0)
{
switch ((parse & 0x38) >> 3)
{
case 1:
tag = "I";
break;
case 2:
tag = "P";
break;
case 3:
tag = "B";
break;
default:
break;
}
if (stream.IsInitialized) return;
}
}
else if (parse == 0x000001B5)
{
extensionParse = 1;
}
else if (extensionParse > 0)
{
--extensionParse;
if (extensionParse == 0)
{
if ((parse & 0xF0) == 0x10)
{
sequenceExtensionParse = 1;
}
}
}
else if (sequenceExtensionParse > 0)
{
--sequenceExtensionParse;
#if DEBUG
if (sequenceExtensionParse == 0)
{
uint sequenceExtension =
((parse & 0x8) >> 3);
if (sequenceExtension == 0)
{
stream.IsInterlaced = true;
}
else
{
stream.IsInterlaced = false;
}
}
#endif
}
}
}
}