1 files changed, 139 insertions, 0 deletions
diff --git a/mp3lib/dct12.c b/mp3lib/dct12.c
new file mode 100644
index 0000000000..61f2b29900
--- /dev/null
+++ b/mp3lib/dct12.c
@@ -0,0 +1,139 @@
+/*
+ * new DCT12
+ */
+static void dct12(real *in,real *rawout1,real *rawout2,register real *wi,register real *ts)
+{
+#define DCT12_PART1 \
+             in5 = in[5*3];  \
+     in5 += (in4 = in[4*3]); \
+     in4 += (in3 = in[3*3]); \
+     in3 += (in2 = in[2*3]); \
+     in2 += (in1 = in[1*3]); \
+     in1 += (in0 = in[0*3]); \
+                             \
+     in5 += in3; in3 += in1; \
+                             \
+     in2 *= COS6_1; \
+     in3 *= COS6_1; \
+
+#define DCT12_PART2 \
+     in0 += in4 * COS6_2; \
+                          \
+     in4 = in0 + in2;     \
+     in0 -= in2;          \
+                          \
+     in1 += in5 * COS6_2; \
+                          \
+     in5 = (in1 + in3) * tfcos12[0]; \
+     in1 = (in1 - in3) * tfcos12[2]; \
+                         \
+     in3 = in4 + in5;    \
+     in4 -= in5;         \
+                         \
+     in2 = in0 + in1;    \
+     in0 -= in1;
+
+
+   {
+     real in0,in1,in2,in3,in4,in5;
+     register real *out1 = rawout1;
+     ts[SBLIMIT*0] = out1[0]; ts[SBLIMIT*1] = out1[1]; ts[SBLIMIT*2] = out1[2];
+     ts[SBLIMIT*3] = out1[3]; ts[SBLIMIT*4] = out1[4]; ts[SBLIMIT*5] = out1[5];
+ 
+     DCT12_PART1
+
+     {
+       real tmp0,tmp1 = (in0 - in4);
+       {
+         real tmp2 = (in1 - in5) * tfcos12[1];
+         tmp0 = tmp1 + tmp2;
+         tmp1 -= tmp2;
+       }
+       ts[(17-1)*SBLIMIT] = out1[17-1] + tmp0 * wi[11-1];
+       ts[(12+1)*SBLIMIT] = out1[12+1] + tmp0 * wi[6+1];
+       ts[(6 +1)*SBLIMIT] = out1[6 +1] + tmp1 * wi[1];
+       ts[(11-1)*SBLIMIT] = out1[11-1] + tmp1 * wi[5-1];
+     }
+
+     DCT12_PART2
+
+     ts[(17-0)*SBLIMIT] = out1[17-0] + in2 * wi[11-0];
+     ts[(12+0)*SBLIMIT] = out1[12+0] + in2 * wi[6+0];
+     ts[(12+2)*SBLIMIT] = out1[12+2] + in3 * wi[6+2];
+     ts[(17-2)*SBLIMIT] = out1[17-2] + in3 * wi[11-2];
+
+     ts[(6+0)*SBLIMIT]  = out1[6+0] + in0 * wi[0];
+     ts[(11-0)*SBLIMIT] = out1[11-0] + in0 * wi[5-0];
+     ts[(6+2)*SBLIMIT]  = out1[6+2] + in4 * wi[2];
+     ts[(11-2)*SBLIMIT] = out1[11-2] + in4 * wi[5-2];
+  }
+
+  in++;
+
+  {
+     real in0,in1,in2,in3,in4,in5;
+     register real *out2 = rawout2;
+ 
+     DCT12_PART1
+
+     {
+       real tmp0,tmp1 = (in0 - in4);
+       {
+         real tmp2 = (in1 - in5) * tfcos12[1];
+         tmp0 = tmp1 + tmp2;
+         tmp1 -= tmp2;
+       }
+       out2[5-1] = tmp0 * wi[11-1];
+       out2[0+1] = tmp0 * wi[6+1];
+       ts[(12+1)*SBLIMIT] += tmp1 * wi[1];
+       ts[(17-1)*SBLIMIT] += tmp1 * wi[5-1];
+     }
+
+     DCT12_PART2
+
+     out2[5-0] = in2 * wi[11-0];
+     out2[0+0] = in2 * wi[6+0];
+     out2[0+2] = in3 * wi[6+2];
+     out2[5-2] = in3 * wi[11-2];
+
+     ts[(12+0)*SBLIMIT] += in0 * wi[0];
+     ts[(17-0)*SBLIMIT] += in0 * wi[5-0];
+     ts[(12+2)*SBLIMIT] += in4 * wi[2];
+     ts[(17-2)*SBLIMIT] += in4 * wi[5-2];
+  }
+
+  in++; 
+
+  {
+     real in0,in1,in2,in3,in4,in5;
+     register real *out2 = rawout2;
+     out2[12]=out2[13]=out2[14]=out2[15]=out2[16]=out2[17]=0.0;
+
+     DCT12_PART1
+
+     {
+       real tmp0,tmp1 = (in0 - in4);
+       {
+         real tmp2 = (in1 - in5) * tfcos12[1];
+         tmp0 = tmp1 + tmp2;
+         tmp1 -= tmp2;
+       }
+       out2[11-1] = tmp0 * wi[11-1];
+       out2[6 +1] = tmp0 * wi[6+1];
+       out2[0+1] += tmp1 * wi[1];
+       out2[5-1] += tmp1 * wi[5-1];
+     }
+
+     DCT12_PART2
+
+     out2[11-0] = in2 * wi[11-0];
+     out2[6 +0] = in2 * wi[6+0];
+     out2[6 +2] = in3 * wi[6+2];
+     out2[11-2] = in3 * wi[11-2];
+
+     out2[0+0] += in0 * wi[0];
+     out2[5-0] += in0 * wi[5-0];
+     out2[0+2] += in4 * wi[2];
+     out2[5-2] += in4 * wi[5-2];
+  }
+}