Initial community commit

1 files changed, 144 insertions, 0 deletions

diff --git a/Src/f263/Block.cpp b/Src/f263/Block.cpp
new file mode 100644
index 00000000..3155e561
--- /dev/null
+++ b/Src/f263/Block.cpp
@@ -0,0 +1,144 @@
+#include "Decoder.h"
+#include "indices.h"
+#include "vlc_table.h"
+
+static unsigned char zig_zag_scan[64]={
+  0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
+  12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
+  35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
+  58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
+};
+
+#define ESCAPE                          7167
+// mode 1 = Inter (or Intra in advanced intra coding mode)
+// mode 0 = Intra
+void Decoder::getblock(int comp, int mode)
+{
+	int val, i, j, sign;
+	unsigned int code;
+	VLCtab *tab;
+	short *bp;
+	int run, last, level, QP;
+	short *qval;
+
+
+	/* TODO: benski>
+	i think this whole function can get replaced with
+	ippiDecodeCoeffsIntra_H263_1u16s (mode==0)
+	or 
+	ippiDecodeCoeffsInter_H263_1u16s (mode == 1)
+	with pCoef = bp
+	modQuantFlag = escapemode>=1
+	scan = IPPVC_SCAN_ZIGZAG
+
+	*/
+	bp = block[comp];
+
+	/* decode AC coefficients (or all coefficients in advanced intra coding
+	* mode) */
+
+	for (i = (mode == 0);; i++)
+	{
+
+		code = buffer.showbits(12);
+		
+
+			if (code >= 512)
+				tab = &DCT3Dtab0[(code >> 5) - 16];
+			else if (code >= 128)
+				tab = &DCT3Dtab1[(code >> 2) - 32];
+			else if (code >= 8)
+				tab = &DCT3Dtab2[(code >> 0) - 8];
+			else
+			{
+				fault = 1;
+				return;
+			}
+
+			run = (tab->val >> 4) & 255;
+			level = tab->val & 15;
+			last = (tab->val >> 12) & 1;
+		
+		buffer.flushbits(tab->len);
+		if (tab->val == ESCAPE)
+		{
+			/* escape */
+			if (escapemode >= 1)
+			{
+				int is11 = buffer.getbits1();
+				sign=0;
+				last = buffer.getbits1();
+				i+=run = buffer.getbits(6);
+				if (is11)
+				{
+					level = buffer.getbits(11);
+					if ((sign = (level>=1024)))
+						val = 2048 - level;
+					else
+						val = level;
+				}
+				else
+				{
+					level = buffer.getbits(7);
+					if ((sign = (level>=64)))
+						val = 128 - level;
+					else
+						val = level;
+				}
+			}
+			else
+			{
+				last = buffer.getbits1();
+				i += run = buffer.getbits(6);
+				level = buffer.getbits(8);
+
+				if ((sign = (level >= 128)))
+					val = 256 - level;
+				else
+					val = level;
+			}
+		}
+		else
+		{
+			i += run;
+			val = level;
+			sign = buffer.getbits(1);
+		}
+
+
+		if (i >= 64)
+		{
+			fault = 1;
+			return;
+		}
+
+		/* Descan in the proper order in advanced intra coding mode */
+
+
+		j = zig_zag_scan[i];
+		qval = &bp[j];
+			QP = quant;
+
+
+
+			/* TODO: benski>
+			ippiQuantInvIntra_H263_16s_C1I
+			or
+			ippiQuantInvInter_H263_16s_C1I (mode == 1)
+			but outside the loop
+			pSrcDst = bp
+			QP = quant
+			modQuantFlag = escapemode >= 1
+			*/
+		/* TMN3 dequantization */
+		if ((QP % 2) == 1)
+			*qval = (sign ? -(QP * (2 * val + 1)) : QP * (2 * val + 1));
+		else
+			*qval = (sign ? -(QP * (2 * val + 1) - 1) : QP * (2 * val + 1) - 1);
+
+		if (last)
+		{
+			/* That's it */
+			return;
+		}
+	}}