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Diffstat (limited to 'apps/codecs/libwma/wmafixed.c')
| -rw-r--r-- | apps/codecs/libwma/wmafixed.c | 223 |
1 files changed, 0 insertions, 223 deletions
diff --git a/apps/codecs/libwma/wmafixed.c b/apps/codecs/libwma/wmafixed.c deleted file mode 100644 index bdf87a548b..0000000000 --- a/apps/codecs/libwma/wmafixed.c +++ /dev/null @@ -1,223 +0,0 @@ -/**************************************************************************** - * __________ __ ___. - * Open \______ \ ____ ____ | | _\_ |__ _______ ___ - * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / - * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < - * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ - * \/ \/ \/ \/ \/ - * - * Copyright (C) 2007 Michael Giacomelli - * - * 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 "wmadec.h" -#include "wmafixed.h" -#include <codecs.h> - -fixed64 IntTo64(int x){ - fixed64 res = 0; - unsigned char *p = (unsigned char *)&res; - -#ifdef ROCKBOX_BIG_ENDIAN - p[5] = x & 0xff; - p[4] = (x & 0xff00)>>8; - p[3] = (x & 0xff0000)>>16; - p[2] = (x & 0xff000000)>>24; -#else - p[2] = x & 0xff; - p[3] = (x & 0xff00)>>8; - p[4] = (x & 0xff0000)>>16; - p[5] = (x & 0xff000000)>>24; -#endif - return res; -} - -int IntFrom64(fixed64 x) -{ - int res = 0; - unsigned char *p = (unsigned char *)&x; - -#ifdef ROCKBOX_BIG_ENDIAN - res = p[5] | (p[4]<<8) | (p[3]<<16) | (p[2]<<24); -#else - res = p[2] | (p[3]<<8) | (p[4]<<16) | (p[5]<<24); -#endif - return res; -} - -fixed32 Fixed32From64(fixed64 x) -{ - return x & 0xFFFFFFFF; -} - -fixed64 Fixed32To64(fixed32 x) -{ - return (fixed64)x; -} - -/* - Not performance senstitive code here - -*/ - -fixed32 fixdiv32(fixed32 x, fixed32 y) -{ - fixed64 temp; - - if(x == 0) - return 0; - if(y == 0) - return 0x7fffffff; - temp = x; - temp <<= PRECISION; - return (fixed32)(temp / y); -} - -fixed64 fixdiv64(fixed64 x, fixed64 y) -{ - fixed64 temp; - - if(x == 0) - return 0; - if(y == 0) - return 0x07ffffffffffffffLL; - temp = x; - temp <<= PRECISION64; - return (fixed64)(temp / y); -} - - fixed32 fixsqrt32(fixed32 x) -{ - - unsigned long r = 0, s, v = (unsigned long)x; - -#define STEP(k) s = r + (1 << k * 2); r >>= 1; \ - if (s <= v) { v -= s; r |= (1 << k * 2); } - - STEP(15); - STEP(14); - STEP(13); - STEP(12); - STEP(11); - STEP(10); - STEP(9); - STEP(8); - STEP(7); - STEP(6); - STEP(5); - STEP(4); - STEP(3); - STEP(2); - STEP(1); - STEP(0); - - return (fixed32)(r << (PRECISION / 2)); -} - - - 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 */ - }; - - /** - * 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. - * - * Gives at least 24 bits precision (last 2-8 bits or so are probably off) - */ - - long fsincos(unsigned long phase, fixed32 *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; - } |