opus-rs 0.1.12

pure Rust implementation of Opus codec
Documentation 
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use crate::range_coder::RangeCoder;
use crate::silk::tables::*;

#[inline]
fn combine_pulses(out: &mut [i32], input: &[i32], len: usize) {
    for k in 0..len {
        out[k] = input[2 * k] + input[2 * k + 1];
    }
}

#[inline]
fn encode_split(ps_range_enc: &mut RangeCoder, p_child1: i32, p: i32, shell_table: &[u8]) {
    if p > 0 {
        ps_range_enc.encode_icdf(
            p_child1,
            &shell_table[SILK_SHELL_CODE_TABLE_OFFSETS[p as usize] as usize..],
            8,
        );
    }
}

pub fn silk_shell_encoder(ps_range_enc: &mut RangeCoder, pulses0: &[i32]) {
    let mut pulses1 = [0i32; 8];
    let mut pulses2 = [0i32; 4];
    let mut pulses3 = [0i32; 2];
    let mut pulses4 = [0i32; 1];

    combine_pulses(&mut pulses1, pulses0, 8);
    combine_pulses(&mut pulses2, &pulses1, 4);
    combine_pulses(&mut pulses3, &pulses2, 2);
    combine_pulses(&mut pulses4, &pulses3, 1);

    encode_split(
        ps_range_enc,
        pulses3[0],
        pulses4[0],
        &SILK_SHELL_CODE_TABLE3,
    );

    encode_split(
        ps_range_enc,
        pulses2[0],
        pulses3[0],
        &SILK_SHELL_CODE_TABLE2,
    );

    encode_split(
        ps_range_enc,
        pulses1[0],
        pulses2[0],
        &SILK_SHELL_CODE_TABLE1,
    );
    encode_split(
        ps_range_enc,
        pulses0[0],
        pulses1[0],
        &SILK_SHELL_CODE_TABLE0,
    );
    encode_split(
        ps_range_enc,
        pulses0[2],
        pulses1[1],
        &SILK_SHELL_CODE_TABLE0,
    );

    encode_split(
        ps_range_enc,
        pulses1[2],
        pulses2[1],
        &SILK_SHELL_CODE_TABLE1,
    );
    encode_split(
        ps_range_enc,
        pulses0[4],
        pulses1[2],
        &SILK_SHELL_CODE_TABLE0,
    );
    encode_split(
        ps_range_enc,
        pulses0[6],
        pulses1[3],
        &SILK_SHELL_CODE_TABLE0,
    );

    encode_split(
        ps_range_enc,
        pulses2[2],
        pulses3[1],
        &SILK_SHELL_CODE_TABLE2,
    );

    encode_split(
        ps_range_enc,
        pulses1[4],
        pulses2[2],
        &SILK_SHELL_CODE_TABLE1,
    );
    encode_split(
        ps_range_enc,
        pulses0[8],
        pulses1[4],
        &SILK_SHELL_CODE_TABLE0,
    );
    encode_split(
        ps_range_enc,
        pulses0[10],
        pulses1[5],
        &SILK_SHELL_CODE_TABLE0,
    );

    encode_split(
        ps_range_enc,
        pulses1[6],
        pulses2[3],
        &SILK_SHELL_CODE_TABLE1,
    );
    encode_split(
        ps_range_enc,
        pulses0[12],
        pulses1[6],
        &SILK_SHELL_CODE_TABLE0,
    );
    encode_split(
        ps_range_enc,
        pulses0[14],
        pulses1[7],
        &SILK_SHELL_CODE_TABLE0,
    );
}