unsafe-libopus 0.2.0

libopus transpiled to rust by c2rust
Documentation 
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use crate::celt::entdec::{ec_dec, ec_dec_icdf};
use crate::externs::memset;
use crate::silk::code_signs::silk_decode_signs;
use crate::silk::define::{N_RATE_LEVELS, SHELL_CODEC_FRAME_LENGTH, SILK_MAX_PULSES};
use crate::silk::shell_coder::silk_shell_decoder;
use crate::silk::tables_other::silk_lsb_iCDF;
use crate::silk::tables_pulses_per_block::{silk_pulses_per_block_iCDF, silk_rate_levels_iCDF};

pub unsafe fn silk_decode_pulses(
    psRangeDec: &mut ec_dec,
    pulses: *mut i16,
    signalType: i32,
    quantOffsetType: i32,
    frame_length: i32,
) {
    let mut i: i32 = 0;
    let mut j: i32 = 0;
    let mut k: i32 = 0;
    let mut iter: i32 = 0;
    let mut abs_q: i32 = 0;
    let mut nLS: i32 = 0;
    let mut RateLevelIndex: i32 = 0;
    let mut sum_pulses: [i32; 20] = [0; 20];
    let mut nLshifts: [i32; 20] = [0; 20];
    let mut pulses_ptr: *mut i16 = 0 as *mut i16;
    RateLevelIndex = ec_dec_icdf(
        psRangeDec,
        &(silk_rate_levels_iCDF[(signalType >> 1) as usize]),
        8,
    );
    iter = frame_length >> 4;
    if iter * SHELL_CODEC_FRAME_LENGTH < frame_length {
        assert!(frame_length == 12 * 10);
        iter += 1;
    }
    let cdf_ptr = &silk_pulses_per_block_iCDF[RateLevelIndex as usize];
    i = 0;
    while i < iter {
        nLshifts[i as usize] = 0;
        sum_pulses[i as usize] = ec_dec_icdf(psRangeDec, cdf_ptr, 8);
        while sum_pulses[i as usize] == SILK_MAX_PULSES + 1 {
            nLshifts[i as usize] += 1;
            sum_pulses[i as usize] = ec_dec_icdf(
                psRangeDec,
                &silk_pulses_per_block_iCDF[(N_RATE_LEVELS - 1) as usize]
                    [(nLshifts[i as usize] == 10) as i32 as usize..],
                8,
            );
        }
        i += 1;
    }
    i = 0;
    while i < iter {
        if sum_pulses[i as usize] > 0 {
            silk_shell_decoder(
                std::slice::from_raw_parts_mut(
                    &mut *pulses.offset((i as i16 as i32 * 16) as isize),
                    SHELL_CODEC_FRAME_LENGTH as usize,
                ),
                psRangeDec,
                sum_pulses[i as usize],
            );
        } else {
            memset(
                &mut *pulses.offset((i as i16 as i32 * 16) as isize) as *mut i16
                    as *mut core::ffi::c_void,
                0,
                16_u64.wrapping_mul(::core::mem::size_of::<i16>() as u64),
            );
        }
        i += 1;
    }
    i = 0;
    while i < iter {
        if nLshifts[i as usize] > 0 {
            nLS = nLshifts[i as usize];
            pulses_ptr = &mut *pulses.offset((i as i16 as i32 * 16) as isize) as *mut i16;
            k = 0;
            while k < SHELL_CODEC_FRAME_LENGTH {
                abs_q = *pulses_ptr.offset(k as isize) as i32;
                j = 0;
                while j < nLS {
                    abs_q = ((abs_q as u32) << 1) as i32;
                    abs_q += ec_dec_icdf(psRangeDec, &silk_lsb_iCDF, 8);
                    j += 1;
                }
                *pulses_ptr.offset(k as isize) = abs_q as i16;
                k += 1;
            }
            sum_pulses[i as usize] |= nLS << 5;
        }
        i += 1;
    }
    silk_decode_signs(
        psRangeDec,
        pulses,
        frame_length,
        signalType,
        quantOffsetType,
        sum_pulses.as_mut_ptr() as *const i32,
    );
}