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-rw-r--r--apps/plugins/lib/SOURCES2
-rw-r--r--apps/plugins/lib/fixedpoint.c238
2 files changed, 1 insertions, 239 deletions
diff --git a/apps/plugins/lib/SOURCES b/apps/plugins/lib/SOURCES
index 02adb7089c..bcce3f2969 100644
--- a/apps/plugins/lib/SOURCES
+++ b/apps/plugins/lib/SOURCES
@@ -1,7 +1,7 @@
gcc-support.c
jhash.c
configfile.c
-fixedpoint.c
+../../fixedpoint.c
playback_control.c
rgb_hsv.c
buflib.c
diff --git a/apps/plugins/lib/fixedpoint.c b/apps/plugins/lib/fixedpoint.c
index 0ae2cded69..e69de29bb2 100644
--- a/apps/plugins/lib/fixedpoint.c
+++ b/apps/plugins/lib/fixedpoint.c
@@ -1,238 +0,0 @@
-/***************************************************************************
- * __________ __ ___.
- * Open \______ \ ____ ____ | | _\_ |__ _______ ___
- * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
- * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
- * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
- * \/ \/ \/ \/ \/
- * $Id$
- *
- * Copyright (C) 2006 Jens Arnold
- *
- * Fixed point library for plugins
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
- * KIND, either express or implied.
- *
- ****************************************************************************/
-
-#include <inttypes.h>
-#include "plugin.h"
-#include "fixedpoint.h"
-
-/* Inverse gain of circular cordic rotation in s0.31 format. */
-static const long cordic_circular_gain = 0xb2458939; /* 0.607252929 */
-
-/* Table of values of atan(2^-i) in 0.32 format fractions of pi where pi = 0xffffffff / 2 */
-static const unsigned long atan_table[] = {
- 0x1fffffff, /* +0.785398163 (or pi/4) */
- 0x12e4051d, /* +0.463647609 */
- 0x09fb385b, /* +0.244978663 */
- 0x051111d4, /* +0.124354995 */
- 0x028b0d43, /* +0.062418810 */
- 0x0145d7e1, /* +0.031239833 */
- 0x00a2f61e, /* +0.015623729 */
- 0x00517c55, /* +0.007812341 */
- 0x0028be53, /* +0.003906230 */
- 0x00145f2e, /* +0.001953123 */
- 0x000a2f98, /* +0.000976562 */
- 0x000517cc, /* +0.000488281 */
- 0x00028be6, /* +0.000244141 */
- 0x000145f3, /* +0.000122070 */
- 0x0000a2f9, /* +0.000061035 */
- 0x0000517c, /* +0.000030518 */
- 0x000028be, /* +0.000015259 */
- 0x0000145f, /* +0.000007629 */
- 0x00000a2f, /* +0.000003815 */
- 0x00000517, /* +0.000001907 */
- 0x0000028b, /* +0.000000954 */
- 0x00000145, /* +0.000000477 */
- 0x000000a2, /* +0.000000238 */
- 0x00000051, /* +0.000000119 */
- 0x00000028, /* +0.000000060 */
- 0x00000014, /* +0.000000030 */
- 0x0000000a, /* +0.000000015 */
- 0x00000005, /* +0.000000007 */
- 0x00000002, /* +0.000000004 */
- 0x00000001, /* +0.000000002 */
- 0x00000000, /* +0.000000001 */
- 0x00000000, /* +0.000000000 */
-};
-
-/* Precalculated sine and cosine * 16384 (2^14) (fixed point 18.14) */
-static const short sin_table[91] =
-{
- 0, 285, 571, 857, 1142, 1427, 1712, 1996, 2280, 2563,
- 2845, 3126, 3406, 3685, 3963, 4240, 4516, 4790, 5062, 5334,
- 5603, 5871, 6137, 6401, 6663, 6924, 7182, 7438, 7691, 7943,
- 8191, 8438, 8682, 8923, 9161, 9397, 9630, 9860, 10086, 10310,
- 10531, 10748, 10963, 11173, 11381, 11585, 11785, 11982, 12175, 12365,
- 12550, 12732, 12910, 13084, 13254, 13420, 13582, 13740, 13894, 14043,
- 14188, 14329, 14466, 14598, 14725, 14848, 14967, 15081, 15190, 15295,
- 15395, 15491, 15582, 15668, 15749, 15825, 15897, 15964, 16025, 16082,
- 16135, 16182, 16224, 16261, 16294, 16321, 16344, 16361, 16374, 16381,
- 16384
-};
-
-/**
- * Implements sin and cos using CORDIC rotation.
- *
- * @param phase has range from 0 to 0xffffffff, representing 0 and
- * 2*pi respectively.
- * @param cos return address for cos
- * @return sin of phase, value is a signed value from LONG_MIN to LONG_MAX,
- * representing -1 and 1 respectively.
- */
-long fsincos(unsigned long phase, long *cos)
-{
- int32_t x, x1, y, y1;
- unsigned long z, z1;
- int i;
-
- /* Setup initial vector */
- x = cordic_circular_gain;
- y = 0;
- z = phase;
-
- /* The phase has to be somewhere between 0..pi for this to work right */
- if (z < 0xffffffff / 4) {
- /* z in first quadrant, z += pi/2 to correct */
- x = -x;
- z += 0xffffffff / 4;
- } else if (z < 3 * (0xffffffff / 4)) {
- /* z in third quadrant, z -= pi/2 to correct */
- z -= 0xffffffff / 4;
- } else {
- /* z in fourth quadrant, z -= 3pi/2 to correct */
- x = -x;
- z -= 3 * (0xffffffff / 4);
- }
-
- /* Each iteration adds roughly 1-bit of extra precision */
- for (i = 0; i < 31; i++) {
- x1 = x >> i;
- y1 = y >> i;
- z1 = atan_table[i];
-
- /* Decided which direction to rotate vector. Pivot point is pi/2 */
- if (z >= 0xffffffff / 4) {
- x -= y1;
- y += x1;
- z -= z1;
- } else {
- x += y1;
- y -= x1;
- z += z1;
- }
- }
-
- if (cos)
- *cos = x;
-
- return y;
-}
-
-/**
- * Fixed point square root via Newton-Raphson.
- * @param a square root argument.
- * @param fracbits specifies number of fractional bits in argument.
- * @return Square root of argument in same fixed point format as input.
- */
-long fsqrt(long a, unsigned int fracbits)
-{
- long b = a/2 + BIT_N(fracbits); /* initial approximation */
- unsigned n;
- const unsigned iterations = 4;
-
- for (n = 0; n < iterations; ++n)
- b = (b + (long)(((long long)(a) << fracbits)/b))/2;
-
- return b;
-}
-
-/**
- * Fixed point sinus using a lookup table
- * don't forget to divide the result by 16384 to get the actual sinus value
- * @param val sinus argument in degree
- * @return sin(val)*16384
- */
-long sin_int(int val)
-{
- val = (val+360)%360;
- if (val < 181)
- {
- if (val < 91)/* phase 0-90 degree */
- return (long)sin_table[val];
- else/* phase 91-180 degree */
- return (long)sin_table[180-val];
- }
- else
- {
- if (val < 271)/* phase 181-270 degree */
- return -(long)sin_table[val-180];
- else/* phase 270-359 degree */
- return -(long)sin_table[360-val];
- }
- return 0;
-}
-
-/**
- * Fixed point cosinus using a lookup table
- * don't forget to divide the result by 16384 to get the actual cosinus value
- * @param val sinus argument in degree
- * @return cos(val)*16384
- */
-long cos_int(int val)
-{
- val = (val+360)%360;
- if (val < 181)
- {
- if (val < 91)/* phase 0-90 degree */
- return (long)sin_table[90-val];
- else/* phase 91-180 degree */
- return -(long)sin_table[val-90];
- }
- else
- {
- if (val < 271)/* phase 181-270 degree */
- return -(long)sin_table[270-val];
- else/* phase 270-359 degree */
- return (long)sin_table[val-270];
- }
- return 0;
-}
-
-/**
- * Fixed-point natural log
- * taken from http://www.quinapalus.com/efunc.html
- * "The code assumes integers are at least 32 bits long. The (positive)
- * argument and the result of the function are both expressed as fixed-point
- * values with 16 fractional bits, although intermediates are kept with 28
- * bits of precision to avoid loss of accuracy during shifts."
- */
-
-long flog(int x) {
- long t,y;
-
- y=0xa65af;
- if(x<0x00008000) x<<=16, y-=0xb1721;
- if(x<0x00800000) x<<= 8, y-=0x58b91;
- if(x<0x08000000) x<<= 4, y-=0x2c5c8;
- if(x<0x20000000) x<<= 2, y-=0x162e4;
- if(x<0x40000000) x<<= 1, y-=0x0b172;
- t=x+(x>>1); if((t&0x80000000)==0) x=t,y-=0x067cd;
- t=x+(x>>2); if((t&0x80000000)==0) x=t,y-=0x03920;
- t=x+(x>>3); if((t&0x80000000)==0) x=t,y-=0x01e27;
- t=x+(x>>4); if((t&0x80000000)==0) x=t,y-=0x00f85;
- t=x+(x>>5); if((t&0x80000000)==0) x=t,y-=0x007e1;
- t=x+(x>>6); if((t&0x80000000)==0) x=t,y-=0x003f8;
- t=x+(x>>7); if((t&0x80000000)==0) x=t,y-=0x001fe;
- x=0x80000000-x;
- y-=x>>15;
- return y;
-}