* adding integer/floating point AAN implementations for DCT 2-4-8

Originally committed as revision 2430 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 86 insertions, 0 deletions

diff --git a/libavcodec/faandct.c b/libavcodec/faandct.c
index a7b9102cfe..e78d49b47c 100644
--- a/libavcodec/faandct.c
+++ b/libavcodec/faandct.c
@@ -160,3 +160,89 @@ void ff_faandct(DCTELEM * data)
         data[8*7 + i]= lrintf(SCALE(8*7 + i) * (z11 - z4));
     }
 }
+
+void ff_faandct248(DCTELEM * data)
+{
+    FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
+    FLOAT tmp10, tmp11, tmp12, tmp13;
+    FLOAT z1, z2, z3, z4, z5, z11, z13;
+    FLOAT temp[64];
+    int i;
+
+    emms_c();
+
+    for (i=0; i<8*8; i+=8) {
+        tmp0= data[0 + i] + data[7 + i];
+        tmp7= data[0 + i] - data[7 + i];
+        tmp1= data[1 + i] + data[6 + i];
+        tmp6= data[1 + i] - data[6 + i];
+        tmp2= data[2 + i] + data[5 + i];
+        tmp5= data[2 + i] - data[5 + i];
+        tmp3= data[3 + i] + data[4 + i];
+        tmp4= data[3 + i] - data[4 + i];
+        
+        tmp10= tmp0 + tmp3;
+        tmp13= tmp0 - tmp3;
+        tmp11= tmp1 + tmp2;
+        tmp12= tmp1 - tmp2;
+        
+        temp[0 + i]= tmp10 + tmp11;
+        temp[4 + i]= tmp10 - tmp11;
+        
+        z1= (tmp12 + tmp13)*A1;
+        temp[2 + i]= tmp13 + z1;
+        temp[6 + i]= tmp13 - z1;
+        
+        tmp10= tmp4 + tmp5;
+        tmp11= tmp5 + tmp6;
+        tmp12= tmp6 + tmp7;
+
+        z5= (tmp10 - tmp12) * A5;
+        z2= tmp10*A2 + z5;
+        z4= tmp12*A4 + z5;
+        z3= tmp11*A1;
+
+        z11= tmp7 + z3;
+        z13= tmp7 - z3;
+
+        temp[5 + i]= z13 + z2;
+        temp[3 + i]= z13 - z2;
+        temp[1 + i]= z11 + z4;
+        temp[7 + i]= z11 - z4;
+    }
+
+    for (i=0; i<8; i++) {
+        tmp0 = temp[8*0 + i] + temp[8*1 + i];
+        tmp1 = temp[8*2 + i] + temp[8*3 + i];
+        tmp2 = temp[8*4 + i] + temp[8*5 + i];
+        tmp3 = temp[8*6 + i] + temp[8*7 + i];
+        tmp4 = temp[8*0 + i] - temp[8*1 + i];
+        tmp5 = temp[8*2 + i] - temp[8*3 + i];
+        tmp6 = temp[8*4 + i] - temp[8*5 + i];
+        tmp7 = temp[8*6 + i] - temp[8*7 + i];
+        
+        tmp10 = tmp0 + tmp3;
+        tmp11 = tmp1 + tmp2;
+        tmp12 = tmp1 - tmp2;
+        tmp13 = tmp0 - tmp3;
+        
+        data[8*0 + i] = lrintf(SCALE(8*0 + i) * (tmp10 + tmp11));
+        data[8*4 + i] = lrintf(SCALE(8*4 + i) * (tmp10 - tmp11));
+        
+        z1 = (tmp12 + tmp13)* A1;
+        data[8*2 + i] = lrintf(SCALE(8*2 + i) * (tmp13 + z1));
+        data[8*6 + i] = lrintf(SCALE(8*6 + i) * (tmp13 - z1));
+        
+        tmp10 = tmp4 + tmp7;
+	tmp11 = tmp5 + tmp6;
+	tmp12 = tmp5 - tmp6;
+	tmp13 = tmp4 - tmp7;
+
+	data[8*1 + i] = lrintf(SCALE(8*0 + i) * (tmp10 + tmp11));
+	data[8*5 + i] = lrintf(SCALE(8*4 + i) * (tmp10 - tmp11));
+
+	z1 = (tmp12 + tmp13)* A1;
+	data[8*3 + i] = lrintf(SCALE(8*2 + i) * (tmp13 + z1));
+	data[8*7 + i] = lrintf(SCALE(8*6 + i) * (tmp13 - z1));
+    }
+}