#include "webrtc/system_wrappers/interface/cpu_features_wrapper.h"
#include "webrtc/typedefs.h"
-// constants shared by all paths (C, SSE2).
-float rdft_w[64];
-// constants used by the C path.
-float rdft_wk3ri_first[32];
-float rdft_wk3ri_second[32];
-// constants used by SSE2 but initialized in C path.
-ALIGN16_BEG float ALIGN16_END rdft_wk1r[32];
-ALIGN16_BEG float ALIGN16_END rdft_wk2r[32];
-ALIGN16_BEG float ALIGN16_END rdft_wk3r[32];
-ALIGN16_BEG float ALIGN16_END rdft_wk1i[32];
-ALIGN16_BEG float ALIGN16_END rdft_wk2i[32];
-ALIGN16_BEG float ALIGN16_END rdft_wk3i[32];
-ALIGN16_BEG float ALIGN16_END cftmdl_wk1r[4];
-
-static int ip[16];
-
-static void bitrv2_32(int* ip, float* a) {
- const int n = 32;
- int j, j1, k, k1, m, m2;
- float xr, xi, yr, yi;
-
- ip[0] = 0;
- {
- int l = n;
- m = 1;
- while ((m << 3) < l) {
- l >>= 1;
- for (j = 0; j < m; j++) {
- ip[m + j] = ip[j] + l;
- }
- m <<= 1;
- }
- }
- m2 = 2 * m;
- for (k = 0; k < m; k++) {
- for (j = 0; j < k; j++) {
- j1 = 2 * j + ip[k];
- k1 = 2 * k + ip[j];
- xr = a[j1];
- xi = a[j1 + 1];
- yr = a[k1];
- yi = a[k1 + 1];
- a[j1] = yr;
- a[j1 + 1] = yi;
- a[k1] = xr;
- a[k1 + 1] = xi;
- j1 += m2;
- k1 += 2 * m2;
- xr = a[j1];
- xi = a[j1 + 1];
- yr = a[k1];
- yi = a[k1 + 1];
- a[j1] = yr;
- a[j1 + 1] = yi;
- a[k1] = xr;
- a[k1 + 1] = xi;
- j1 += m2;
- k1 -= m2;
- xr = a[j1];
- xi = a[j1 + 1];
- yr = a[k1];
- yi = a[k1 + 1];
- a[j1] = yr;
- a[j1 + 1] = yi;
- a[k1] = xr;
- a[k1 + 1] = xi;
- j1 += m2;
- k1 += 2 * m2;
- xr = a[j1];
- xi = a[j1 + 1];
- yr = a[k1];
- yi = a[k1 + 1];
- a[j1] = yr;
- a[j1 + 1] = yi;
- a[k1] = xr;
- a[k1 + 1] = xi;
- }
- j1 = 2 * k + m2 + ip[k];
- k1 = j1 + m2;
- xr = a[j1];
- xi = a[j1 + 1];
- yr = a[k1];
- yi = a[k1 + 1];
- a[j1] = yr;
- a[j1 + 1] = yi;
- a[k1] = xr;
- a[k1 + 1] = xi;
- }
-}
+// These tables used to be computed at run-time. For example, refer to:
+// https://code.google.com/p/webrtc/source/browse/trunk/webrtc/modules/audio_processing/aec/aec_rdft.c?r=6564
+// to see the initialization code.
+const float rdft_w[64] = {
+ 1.0000000000f, 0.0000000000f, 0.7071067691f, 0.7071067691f,
+ 0.9238795638f, 0.3826834559f, 0.3826834559f, 0.9238795638f,
+ 0.9807852507f, 0.1950903237f, 0.5555702448f, 0.8314695954f,
+ 0.8314695954f, 0.5555702448f, 0.1950903237f, 0.9807852507f,
+ 0.9951847196f, 0.0980171412f, 0.6343933344f, 0.7730104327f,
+ 0.8819212914f, 0.4713967443f, 0.2902846634f, 0.9569403529f,
+ 0.9569403529f, 0.2902846634f, 0.4713967443f, 0.8819212914f,
+ 0.7730104327f, 0.6343933344f, 0.0980171412f, 0.9951847196f,
+ 0.7071067691f, 0.4993977249f, 0.4975923598f, 0.4945882559f,
+ 0.4903926253f, 0.4850156307f, 0.4784701765f, 0.4707720280f,
+ 0.4619397819f, 0.4519946277f, 0.4409606457f, 0.4288643003f,
+ 0.4157347977f, 0.4016037583f, 0.3865052164f, 0.3704755902f,
+ 0.3535533845f, 0.3357794881f, 0.3171966672f, 0.2978496552f,
+ 0.2777851224f, 0.2570513785f, 0.2356983721f, 0.2137775421f,
+ 0.1913417280f, 0.1684449315f, 0.1451423317f, 0.1214900985f,
+ 0.0975451618f, 0.0733652338f, 0.0490085706f, 0.0245338380f,
+};
+const float rdft_wk3ri_first[16] = {
+ 1.000000000f, 0.000000000f, 0.382683456f, 0.923879564f,
+ 0.831469536f, 0.555570245f, -0.195090353f, 0.980785251f,
+ 0.956940353f, 0.290284693f, 0.098017156f, 0.995184720f,
+ 0.634393334f, 0.773010492f, -0.471396863f, 0.881921172f,
+};
+const float rdft_wk3ri_second[16] = {
+ -0.707106769f, 0.707106769f, -0.923879564f, -0.382683456f,
+ -0.980785251f, 0.195090353f, -0.555570245f, -0.831469536f,
+ -0.881921172f, 0.471396863f, -0.773010492f, -0.634393334f,
+ -0.995184720f, -0.098017156f, -0.290284693f, -0.956940353f,
+};
+ALIGN16_BEG const float ALIGN16_END rdft_wk1r[32] = {
+ 1.000000000f, 1.000000000f, 0.707106769f, 0.707106769f,
+ 0.923879564f, 0.923879564f, 0.382683456f, 0.382683456f,
+ 0.980785251f, 0.980785251f, 0.555570245f, 0.555570245f,
+ 0.831469595f, 0.831469595f, 0.195090324f, 0.195090324f,
+ 0.995184720f, 0.995184720f, 0.634393334f, 0.634393334f,
+ 0.881921291f, 0.881921291f, 0.290284663f, 0.290284663f,
+ 0.956940353f, 0.956940353f, 0.471396744f, 0.471396744f,
+ 0.773010433f, 0.773010433f, 0.098017141f, 0.098017141f,
+};
+ALIGN16_BEG const float ALIGN16_END rdft_wk2r[32] = {
+ 1.000000000f, 1.000000000f, -0.000000000f, -0.000000000f,
+ 0.707106769f, 0.707106769f, -0.707106769f, -0.707106769f,
+ 0.923879564f, 0.923879564f, -0.382683456f, -0.382683456f,
+ 0.382683456f, 0.382683456f, -0.923879564f, -0.923879564f,
+ 0.980785251f, 0.980785251f, -0.195090324f, -0.195090324f,
+ 0.555570245f, 0.555570245f, -0.831469595f, -0.831469595f,
+ 0.831469595f, 0.831469595f, -0.555570245f, -0.555570245f,
+ 0.195090324f, 0.195090324f, -0.980785251f, -0.980785251f,
+};
+ALIGN16_BEG const float ALIGN16_END rdft_wk3r[32] = {
+ 1.000000000f, 1.000000000f, -0.707106769f, -0.707106769f,
+ 0.382683456f, 0.382683456f, -0.923879564f, -0.923879564f,
+ 0.831469536f, 0.831469536f, -0.980785251f, -0.980785251f,
+ -0.195090353f, -0.195090353f, -0.555570245f, -0.555570245f,
+ 0.956940353f, 0.956940353f, -0.881921172f, -0.881921172f,
+ 0.098017156f, 0.098017156f, -0.773010492f, -0.773010492f,
+ 0.634393334f, 0.634393334f, -0.995184720f, -0.995184720f,
+ -0.471396863f, -0.471396863f, -0.290284693f, -0.290284693f,
+};
+ALIGN16_BEG const float ALIGN16_END rdft_wk1i[32] = {
+ -0.000000000f, 0.000000000f, -0.707106769f, 0.707106769f,
+ -0.382683456f, 0.382683456f, -0.923879564f, 0.923879564f,
+ -0.195090324f, 0.195090324f, -0.831469595f, 0.831469595f,
+ -0.555570245f, 0.555570245f, -0.980785251f, 0.980785251f,
+ -0.098017141f, 0.098017141f, -0.773010433f, 0.773010433f,
+ -0.471396744f, 0.471396744f, -0.956940353f, 0.956940353f,
+ -0.290284663f, 0.290284663f, -0.881921291f, 0.881921291f,
+ -0.634393334f, 0.634393334f, -0.995184720f, 0.995184720f,
+};
+ALIGN16_BEG const float ALIGN16_END rdft_wk2i[32] = {
+ -0.000000000f, 0.000000000f, -1.000000000f, 1.000000000f,
+ -0.707106769f, 0.707106769f, -0.707106769f, 0.707106769f,
+ -0.382683456f, 0.382683456f, -0.923879564f, 0.923879564f,
+ -0.923879564f, 0.923879564f, -0.382683456f, 0.382683456f,
+ -0.195090324f, 0.195090324f, -0.980785251f, 0.980785251f,
+ -0.831469595f, 0.831469595f, -0.555570245f, 0.555570245f,
+ -0.555570245f, 0.555570245f, -0.831469595f, 0.831469595f,
+ -0.980785251f, 0.980785251f, -0.195090324f, 0.195090324f,
+};
+ALIGN16_BEG const float ALIGN16_END rdft_wk3i[32] = {
+ -0.000000000f, 0.000000000f, -0.707106769f, 0.707106769f,
+ -0.923879564f, 0.923879564f, 0.382683456f, -0.382683456f,
+ -0.555570245f, 0.555570245f, -0.195090353f, 0.195090353f,
+ -0.980785251f, 0.980785251f, 0.831469536f, -0.831469536f,
+ -0.290284693f, 0.290284693f, -0.471396863f, 0.471396863f,
+ -0.995184720f, 0.995184720f, 0.634393334f, -0.634393334f,
+ -0.773010492f, 0.773010492f, 0.098017156f, -0.098017156f,
+ -0.881921172f, 0.881921172f, 0.956940353f, -0.956940353f,
+};
+ALIGN16_BEG const float ALIGN16_END cftmdl_wk1r[4] = {
+ 0.707106769f, 0.707106769f, 0.707106769f, -0.707106769f,
+};
static void bitrv2_128_C(float* a) {
/*
}
}
-static void makewt_32(void) {
- const int nw = 32;
- int j, nwh;
- float delta, x, y;
-
- ip[0] = nw;
- ip[1] = 1;
- nwh = nw >> 1;
- delta = atanf(1.0f) / nwh;
- rdft_w[0] = 1;
- rdft_w[1] = 0;
- rdft_w[nwh] = cosf(delta * nwh);
- rdft_w[nwh + 1] = rdft_w[nwh];
- for (j = 2; j < nwh; j += 2) {
- x = cosf(delta * j);
- y = sinf(delta * j);
- rdft_w[j] = x;
- rdft_w[j + 1] = y;
- rdft_w[nw - j] = y;
- rdft_w[nw - j + 1] = x;
- }
- bitrv2_32(ip + 2, rdft_w);
-
- // pre-calculate constants used by cft1st_128 and cftmdl_128...
- cftmdl_wk1r[0] = rdft_w[2];
- cftmdl_wk1r[1] = rdft_w[2];
- cftmdl_wk1r[2] = rdft_w[2];
- cftmdl_wk1r[3] = -rdft_w[2];
- {
- int k1;
-
- for (k1 = 0, j = 0; j < 128; j += 16, k1 += 2) {
- const int k2 = 2 * k1;
- const float wk2r = rdft_w[k1 + 0];
- const float wk2i = rdft_w[k1 + 1];
- float wk1r, wk1i;
- // ... scalar version.
- wk1r = rdft_w[k2 + 0];
- wk1i = rdft_w[k2 + 1];
- rdft_wk3ri_first[k1 + 0] = wk1r - 2 * wk2i * wk1i;
- rdft_wk3ri_first[k1 + 1] = 2 * wk2i * wk1r - wk1i;
- wk1r = rdft_w[k2 + 2];
- wk1i = rdft_w[k2 + 3];
- rdft_wk3ri_second[k1 + 0] = wk1r - 2 * wk2r * wk1i;
- rdft_wk3ri_second[k1 + 1] = 2 * wk2r * wk1r - wk1i;
- // ... vector version.
- rdft_wk1r[k2 + 0] = rdft_w[k2 + 0];
- rdft_wk1r[k2 + 1] = rdft_w[k2 + 0];
- rdft_wk1r[k2 + 2] = rdft_w[k2 + 2];
- rdft_wk1r[k2 + 3] = rdft_w[k2 + 2];
- rdft_wk2r[k2 + 0] = rdft_w[k1 + 0];
- rdft_wk2r[k2 + 1] = rdft_w[k1 + 0];
- rdft_wk2r[k2 + 2] = -rdft_w[k1 + 1];
- rdft_wk2r[k2 + 3] = -rdft_w[k1 + 1];
- rdft_wk3r[k2 + 0] = rdft_wk3ri_first[k1 + 0];
- rdft_wk3r[k2 + 1] = rdft_wk3ri_first[k1 + 0];
- rdft_wk3r[k2 + 2] = rdft_wk3ri_second[k1 + 0];
- rdft_wk3r[k2 + 3] = rdft_wk3ri_second[k1 + 0];
- rdft_wk1i[k2 + 0] = -rdft_w[k2 + 1];
- rdft_wk1i[k2 + 1] = rdft_w[k2 + 1];
- rdft_wk1i[k2 + 2] = -rdft_w[k2 + 3];
- rdft_wk1i[k2 + 3] = rdft_w[k2 + 3];
- rdft_wk2i[k2 + 0] = -rdft_w[k1 + 1];
- rdft_wk2i[k2 + 1] = rdft_w[k1 + 1];
- rdft_wk2i[k2 + 2] = -rdft_w[k1 + 0];
- rdft_wk2i[k2 + 3] = rdft_w[k1 + 0];
- rdft_wk3i[k2 + 0] = -rdft_wk3ri_first[k1 + 1];
- rdft_wk3i[k2 + 1] = rdft_wk3ri_first[k1 + 1];
- rdft_wk3i[k2 + 2] = -rdft_wk3ri_second[k1 + 1];
- rdft_wk3i[k2 + 3] = rdft_wk3ri_second[k1 + 1];
- }
- }
-}
-
-static void makect_32(void) {
- float* c = rdft_w + 32;
- const int nc = 32;
- int j, nch;
- float delta;
-
- ip[1] = nc;
- nch = nc >> 1;
- delta = atanf(1.0f) / nch;
- c[0] = cosf(delta * nch);
- c[nch] = 0.5f * c[0];
- for (j = 1; j < nch; j++) {
- c[j] = 0.5f * cosf(delta * j);
- c[nc - j] = 0.5f * sinf(delta * j);
- }
-}
-
static void cft1st_128_C(float* a) {
const int n = 128;
int j, k1, k2;
#if defined(WEBRTC_DETECT_ARM_NEON) || defined(WEBRTC_ARCH_ARM_NEON)
aec_rdft_init_neon();
#endif
- // init library constants.
- makewt_32();
- makect_32();
}
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