unsafe-libopus 0.2.0

libopus transpiled to rust by c2rust
Documentation 
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use crate::silk::inner_prod_aligned::silk_inner_prod_aligned_scale;
use crate::silk::sum_sqr_shift::silk_sum_sqr_shift;
use crate::silk::SigProc_FIX::silk_max_int;

use crate::silk::Inlines::{silk_DIV32_varQ, silk_SQRT_APPROX};

pub unsafe fn silk_stereo_find_predictor(
    ratio_Q14: *mut i32,
    x: *const i16,
    y: *const i16,
    mid_res_amp_Q0: *mut i32,
    length: i32,
    mut smooth_coef_Q16: i32,
) -> i32 {
    let mut scale: i32 = 0;
    let mut scale1: i32 = 0;
    let mut scale2: i32 = 0;
    let mut nrgx: i32 = 0;
    let mut nrgy: i32 = 0;
    let mut corr: i32 = 0;
    let mut pred_Q13: i32 = 0;
    let mut pred2_Q10: i32 = 0;
    silk_sum_sqr_shift(&mut nrgx, &mut scale1, x, length);
    silk_sum_sqr_shift(&mut nrgy, &mut scale2, y, length);
    scale = silk_max_int(scale1, scale2);
    scale = scale + (scale & 1);
    nrgy = nrgy >> scale - scale2;
    nrgx = nrgx >> scale - scale1;
    nrgx = silk_max_int(nrgx, 1);
    corr = silk_inner_prod_aligned_scale(x, y, scale, length);
    pred_Q13 = silk_DIV32_varQ(corr, nrgx, 13);
    pred_Q13 = if -((1) << 14) > (1) << 14 {
        if pred_Q13 > -((1) << 14) {
            -((1) << 14)
        } else if pred_Q13 < (1) << 14 {
            (1) << 14
        } else {
            pred_Q13
        }
    } else if pred_Q13 > (1) << 14 {
        (1) << 14
    } else if pred_Q13 < -((1) << 14) {
        -((1) << 14)
    } else {
        pred_Q13
    };
    pred2_Q10 = (pred_Q13 as i64 * pred_Q13 as i16 as i64 >> 16) as i32;
    smooth_coef_Q16 = silk_max_int(
        smooth_coef_Q16,
        if pred2_Q10 > 0 { pred2_Q10 } else { -pred2_Q10 },
    );
    scale = scale >> 1;
    *mid_res_amp_Q0.offset(0 as isize) = (*mid_res_amp_Q0.offset(0 as isize) as i64
        + ((((silk_SQRT_APPROX(nrgx) as u32) << scale) as i32 - *mid_res_amp_Q0.offset(0 as isize))
            as i64
            * smooth_coef_Q16 as i16 as i64
            >> 16)) as i32;
    nrgy = nrgy - (((corr as i64 * pred_Q13 as i16 as i64 >> 16) as i32 as u32) << 3 + 1) as i32;
    nrgy = nrgy + (((nrgx as i64 * pred2_Q10 as i16 as i64 >> 16) as i32 as u32) << 6) as i32;
    *mid_res_amp_Q0.offset(1 as isize) = (*mid_res_amp_Q0.offset(1 as isize) as i64
        + ((((silk_SQRT_APPROX(nrgy) as u32) << scale) as i32 - *mid_res_amp_Q0.offset(1 as isize))
            as i64
            * smooth_coef_Q16 as i16 as i64
            >> 16)) as i32;
    *ratio_Q14 = silk_DIV32_varQ(
        *mid_res_amp_Q0.offset(1 as isize),
        if *mid_res_amp_Q0.offset(0 as isize) > 1 {
            *mid_res_amp_Q0.offset(0 as isize)
        } else {
            1
        },
        14,
    );
    *ratio_Q14 = if 0 > 32767 {
        if *ratio_Q14 > 0 {
            0
        } else if *ratio_Q14 < 32767 {
            32767
        } else {
            *ratio_Q14
        }
    } else if *ratio_Q14 > 32767 {
        32767
    } else if *ratio_Q14 < 0 {
        0
    } else {
        *ratio_Q14
    };
    return pred_Q13;
}