1 files changed, 350 insertions, 0 deletions

diff --git a/apps/codecs/libwma/wmafixed.c b/apps/codecs/libwma/wmafixed.c
new file mode 100644
index 0000000000..6cb3d3c4a6
--- /dev/null
+++ b/apps/codecs/libwma/wmafixed.c
@@ -0,0 +1,350 @@
+//#include "asf.h"
+#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;
+}
+
+
+/*
+        Fixed precision multiply code.
+
+*/
+
+/*Sign-15.16 format */
+#ifdef CPU_ARM
+/* these are defines in wmafixed.h*/
+
+
+#elif defined(CPU_COLDFIRE)
+static inline int32_t fixmul32(int32_t x, int32_t y)
+{
+#if PRECISION != 16
+#warning Coldfire fixmul32() only works for PRECISION == 16
+#endif
+    int32_t t1;
+    asm (
+        "mac.l   %[x], %[y], %%acc0  \n" /* multiply */
+        "mulu.l  %[y], %[x]      \n"     /* get lower half, avoid emac stall */
+        "movclr.l %%acc0, %[t1]  \n"     /* get higher half */
+        "lsr.l   #1, %[t1]       \n"
+        "move.w  %[t1], %[x]     \n"
+        "swap    %[x]            \n"
+        : /* outputs */
+        [t1]"=&d"(t1),
+        [x] "+d" (x)
+        : /* inputs */
+        [y] "d"  (y)
+    );
+    return x;
+}
+#else
+
+fixed32 fixmul32(fixed32 x, fixed32 y)
+{
+    fixed64 temp;
+    temp = x;
+    temp *= y;
+
+    temp >>= PRECISION;
+
+    return (fixed32)temp;
+}
+
+
+
+/*
+        Special fixmul32 that does a 16.16 x 1.31 multiply that returns a 16.16 value.
+        this is needed because the fft constants are all normalized to be less then 1
+        and can't fit into a 16 bit number without excessive rounding
+
+
+*/
+
+fixed32 fixmul32b(fixed32 x, fixed32 y)
+{
+    fixed64 temp;
+
+    temp = x;
+    temp *= y;
+
+    temp >>= 31;        //16+31-16 = 31 bits
+
+    return (fixed32)temp;
+}
+
+#endif
+
+
+/*
+        Not performance senstitive code here
+
+*/
+
+
+fixed64 fixmul64byfixed(fixed64 x, fixed32 y)
+{
+
+    //return x * y;
+     return (x * y);
+ // return (fixed64) fixmul32(Fixed32From64(x),y);
+}
+
+
+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));
+}
+
+
+
+/* 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 */
+};
+
+
+/*
+
+        Below here functions do not use standard fixed precision!
+*/
+
+
+/**
+ * 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;
+}
+
+
+/*
+        Old trig functions.  Still used in 1 place each.
+
+*/
+
+fixed32 fixsin32(fixed32 x)
+{
+
+    fixed64 x2, temp;
+    int     sign = 1;
+
+    if(x < 0)
+    {
+        sign = -1;
+        x = -x;
+    }
+    while (x > 0x19220)
+    {
+        x -= M_PI_F;
+        sign = -sign;
+    }
+    if (x > 0x19220)
+    {
+        x = M_PI_F - x;
+    }
+    x2 = (fixed64)x * x;
+    x2 >>= PRECISION;
+    if(sign != 1)
+    {
+        x = -x;
+    }
+    /**
+    temp = ftofix32(-.0000000239f) * x2;
+    temp >>= PRECISION;
+    **/
+    temp = 0; // PJJ
+    //temp = (temp + 0x0) * x2;    //MGG:  this can't possibly do anything?
+    //temp >>= PRECISION;
+    temp = (temp - 0xd) * x2;
+    temp >>= PRECISION;
+    temp = (temp + 0x222) * x2;
+    temp >>= PRECISION;
+    temp = (temp - 0x2aab) * x2;
+    temp >>= PRECISION;
+    temp += 0x10000;
+    temp = temp * x;
+    temp >>= PRECISION;
+
+    return  (fixed32)(temp);
+}
+
+fixed32 fixcos32(fixed32 x)
+{
+    return fixsin32(x - (M_PI_F>>1))*-1;
+}