/*
* Floating point AAN DCT
- * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
- *
* this implementation is based upon the IJG integer AAN DCT (see jfdctfst.c)
*
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
+ * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (c) 2003 Roman Shaposhnik
*
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
*
- * The AAN DCT in this file except ff_faandct248() can also be used under the
- * new (3 clause) BSD license.
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/**
- * @file faandct.c
+ * @file
* @brief
* Floating point AAN DCT
* @author Michael Niedermayer <michaelni@gmx.at>
#include "faandct.h"
#define FLOAT float
-#ifdef FAAN_POSTSCALE
-# define SCALE(x) postscale[x]
-#else
-# define SCALE(x) 1
-#endif
//numbers generated by simple c code (not as accurate as they could be)
/*
#define A5 0.38268343236508977170 // cos(pi*6/16)
#define A4 1.30656296487637652774 // cos(pi*2/16)sqrt(2)
-static FLOAT postscale[64]={
+static const FLOAT postscale[64]={
B0*B0, B0*B1, B0*B2, B0*B3, B0*B4, B0*B5, B0*B6, B0*B7,
B1*B0, B1*B1, B1*B2, B1*B3, B1*B4, B1*B5, B1*B6, B1*B7,
B2*B0, B2*B1, B2*B2, B2*B3, B2*B4, B2*B5, B2*B6, B2*B7,
{
FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
FLOAT tmp10, tmp11, tmp12, tmp13;
- FLOAT z2, z4, z5, z11, z13;
+ FLOAT z2, z4, z11, z13;
+ FLOAT av_unused z5;
int i;
for (i=0; i<8*8; i+=8) {
tmp5 += tmp6;
tmp6 += tmp7;
+#if 0
z5= (tmp4 - tmp6) * A5;
z2= tmp4*A2 + z5;
z4= tmp6*A4 + z5;
+#else
+ z2= tmp4*(A2+A5) - tmp6*A5;
+ z4= tmp6*(A4-A5) + tmp4*A5;
+#endif
tmp5*=A1;
z11= tmp7 + tmp5;
{
FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
FLOAT tmp10, tmp11, tmp12, tmp13;
- FLOAT z2, z4, z5, z11, z13;
+ FLOAT z2, z4, z11, z13;
+ FLOAT av_unused z5;
FLOAT temp[64];
int i;
tmp11= tmp1 + tmp2;
tmp12= tmp1 - tmp2;
- data[8*0 + i]= lrintf(SCALE(8*0 + i) * (tmp10 + tmp11));
- data[8*4 + i]= lrintf(SCALE(8*4 + i) * (tmp10 - tmp11));
+ data[8*0 + i]= lrintf(postscale[8*0 + i] * (tmp10 + tmp11));
+ data[8*4 + i]= lrintf(postscale[8*4 + i] * (tmp10 - tmp11));
tmp12 += tmp13;
tmp12 *= A1;
- data[8*2 + i]= lrintf(SCALE(8*2 + i) * (tmp13 + tmp12));
- data[8*6 + i]= lrintf(SCALE(8*6 + i) * (tmp13 - tmp12));
+ data[8*2 + i]= lrintf(postscale[8*2 + i] * (tmp13 + tmp12));
+ data[8*6 + i]= lrintf(postscale[8*6 + i] * (tmp13 - tmp12));
tmp4 += tmp5;
tmp5 += tmp6;
tmp6 += tmp7;
+#if 0
z5= (tmp4 - tmp6) * A5;
z2= tmp4*A2 + z5;
z4= tmp6*A4 + z5;
+#else
+ z2= tmp4*(A2+A5) - tmp6*A5;
+ z4= tmp6*(A4-A5) + tmp4*A5;
+#endif
tmp5*=A1;
z11= tmp7 + tmp5;
z13= tmp7 - tmp5;
- data[8*5 + i]= lrintf(SCALE(8*5 + i) * (z13 + z2));
- data[8*3 + i]= lrintf(SCALE(8*3 + i) * (z13 - z2));
- data[8*1 + i]= lrintf(SCALE(8*1 + i) * (z11 + z4));
- data[8*7 + i]= lrintf(SCALE(8*7 + i) * (z11 - z4));
+ data[8*5 + i]= lrintf(postscale[8*5 + i] * (z13 + z2));
+ data[8*3 + i]= lrintf(postscale[8*3 + i] * (z13 - z2));
+ data[8*1 + i]= lrintf(postscale[8*1 + i] * (z11 + z4));
+ data[8*7 + i]= lrintf(postscale[8*7 + i] * (z11 - z4));
}
}
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));
+ data[8*0 + i] = lrintf(postscale[8*0 + i] * (tmp10 + tmp11));
+ data[8*4 + i] = lrintf(postscale[8*4 + i] * (tmp10 - tmp11));
tmp12 += tmp13;
tmp12 *= A1;
- data[8*2 + i] = lrintf(SCALE(8*2 + i) * (tmp13 + tmp12));
- data[8*6 + i] = lrintf(SCALE(8*6 + i) * (tmp13 - tmp12));
+ data[8*2 + i] = lrintf(postscale[8*2 + i] * (tmp13 + tmp12));
+ data[8*6 + i] = lrintf(postscale[8*6 + i] * (tmp13 - tmp12));
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));
+ data[8*1 + i] = lrintf(postscale[8*0 + i] * (tmp10 + tmp11));
+ data[8*5 + i] = lrintf(postscale[8*4 + i] * (tmp10 - tmp11));
tmp12 += tmp13;
tmp12 *= A1;
- data[8*3 + i] = lrintf(SCALE(8*2 + i) * (tmp13 + tmp12));
- data[8*7 + i] = lrintf(SCALE(8*6 + i) * (tmp13 - tmp12));
+ data[8*3 + i] = lrintf(postscale[8*2 + i] * (tmp13 + tmp12));
+ data[8*7 + i] = lrintf(postscale[8*6 + i] * (tmp13 - tmp12));
}
}