void postfilter(
MODEL *model,
float *bg_est
)
{
int m, uv;
float e, thresh;
/* determine average energy across spectrum */
e = 1E-12;
for(m=1; m<=model->L; m++)
e += model->A[m]*model->A[m];
assert(e > 0.0);
e = 10.0*log10f(e/model->L);
/* If beneath threhold, update bg estimate. The idea
of the threshold is to prevent updating during high level
speech. */
if ((e < BG_THRESH) && !model->voiced)
*bg_est = *bg_est*(1.0 - BG_BETA) + e*BG_BETA;
/* now mess with phases during voiced frames to make any harmonics
less then our background estimate unvoiced.
*/
uv = 0;
thresh = powf(10.0, (*bg_est + BG_MARGIN)/20.0);
if (model->voiced)
for(m=1; m<=model->L; m++)
if (model->A[m] < thresh) {
model->phi[m] = TWO_PI*(float)codec2_rand()/CODEC2_RAND_MAX;
uv++;
}
#ifdef DUMP
dump_bg(e, *bg_est, 100.0*uv/model->L);
#endif
}
void init_graphic()
{
memset(&ctx, 0, sizeof(DrawCtx));
// alloc VSH Menu graphic buffers, generic based on canvas constants
buf[0].addr = mem_alloc(CANVAS_W * CANVAS_H * sizeof(uint32_t)); // canvas buffer
buf[1].addr = mem_alloc(CANVAS_W * CANVAS_H * sizeof(uint32_t)); // background buffer
#ifdef HAVE_PNG_FONT
// load font png
Buffer font = load_png(PNG_FONT_PATH);
ctx.font = font.addr;
#endif
// set drawing context
ctx.canvas = buf[0].addr;
ctx.bg = buf[1].addr;
ctx.bg_color = 0xFF000000; // black, opaque
ctx.fg_color = 0xFFFFFFFF; // white, opaque
// get current display values
offset = *(uint32_t*)0x60201104; // start offset of current framebuffer
getDisplayPitch(&pitch, &unk1); // framebuffer pitch size
h = getDisplayHeight(); // display height
w = getDisplayWidth(); // display width
// get x/y start coordinates for our canvas, always center
canvas_x = (w - CANVAS_W) /2;
canvas_y = (h - CANVAS_H) /2;
// dump background, for alpha blending
dump_bg();
// init first frame with background dump
memcpy((uint8_t *)ctx.canvas, (uint8_t *)ctx.bg, CANVAS_W * CANVAS_H * sizeof(uint32_t));
}