aac: SBR support (without PS)

[nihav.git] / nihav-mpeg / src / codecs / aac / sbr / synth.rs

use super::*;
use super::bs::FrameClass;
use super::dsp::{SBRAnalysis, SBRSynthesis};
use nihav_codec_support::dsp::fft::{FFTComplex, FFTC_ZERO};

const RANGE: f32 = 65536.0;

const SMOOTH_DELAY: usize = 4;

const NEW_BW: [[f32; 4]; 4] = [
    [ 0.0, 0.6,  0.9, 0.98 ],
    [ 0.6, 0.75, 0.9, 0.98 ],
    [ 0.0, 0.75, 0.9, 0.98 ],
    [ 0.0, 0.75, 0.9, 0.98 ]
];

#[derive(Clone, Copy)]
pub enum QuantMode {
    Single,
    Left,
    Right,
}

#[derive(Clone)]
pub struct SBRChannel {
        sbr_a:              SBRAnalysis,
        sbr_s:              SBRSynthesis,

        w:                  [[FFTComplex; SBR_BANDS]; QMF_DELAY + MAX_SLOTS * 2],
        x:                  [[FFTComplex; SBR_BANDS]; QMF_DELAY + MAX_SLOTS * 2],
        x_high:             [[FFTComplex; SBR_BANDS]; QMF_DELAY + MAX_SLOTS * 2],
        y:                  [[FFTComplex; SBR_BANDS]; QMF_DELAY + MAX_SLOTS * 2],
        prev_y:             [[FFTComplex; SBR_BANDS]; QMF_DELAY + MAX_SLOTS * 2],

        bw_array:           [f32; SBR_BANDS],
        old_bw_array:       [f32; SBR_BANDS],

    pub qmode:              QuantMode,
    pub fclass:             FrameClass,
    pub amp_res:            bool,
    pub num_env:            usize,
        prev_num_env:       usize,
    pub freq_res:           [bool; NUM_ENVELOPES],
    pub env_border:         [usize; NUM_ENVELOPES],
    pub noise_env_border:   [usize; 3],
    pub pointer:            u8,
    pub num_noise:          usize,
    pub last_env_end:       usize,

    pub df_env:             [bool; NUM_ENVELOPES],
    pub df_noise:           [bool; 2],

    pub invf_mode:          [u8; NUM_PATCHES],
        old_invf_mode:      [u8; NUM_PATCHES],

    pub data_env:           [[i8; SBR_BANDS]; NUM_PATCHES],
    pub data_noise:         [[i8; SBR_BANDS]; NUM_PATCHES],
    pub data_env2:          [[i8; SBR_BANDS]; NUM_PATCHES],
    pub data_noise2:        [[i8; SBR_BANDS]; NUM_PATCHES],
    pub last_envelope:      [i8; SBR_BANDS],
    pub last_noise_env:     [i8; SBR_BANDS],
    pub last_freq_res:      bool,

    pub add_harmonic:       [bool; SBR_BANDS],
        prev_l_a:           i8,

        s_idx_mapped:       [[bool; SBR_BANDS]; NUM_ENVELOPES],
        prev_s_idx_mapped:  [bool; SBR_BANDS],
        index_sine:         usize,
        index_noise:        usize,
        g_temp:             [[f32; SBR_BANDS]; MAX_SLOTS * 2 + QMF_DELAY + SMOOTH_DELAY],
        q_temp:             [[f32; SBR_BANDS]; MAX_SLOTS * 2 + QMF_DELAY + SMOOTH_DELAY],
}

impl SBRChannel {
    pub fn new() -> Self {
        Self {
            sbr_a:              SBRAnalysis::new(),
            sbr_s:              SBRSynthesis::new(),

            w:                  [[FFTC_ZERO; SBR_BANDS]; QMF_DELAY + MAX_SLOTS * 2],
            x:                  [[FFTC_ZERO; SBR_BANDS]; QMF_DELAY + MAX_SLOTS * 2],
            x_high:             [[FFTC_ZERO; SBR_BANDS]; QMF_DELAY + MAX_SLOTS * 2],
            y:                  [[FFTC_ZERO; SBR_BANDS]; QMF_DELAY + MAX_SLOTS * 2],
            prev_y:             [[FFTC_ZERO; SBR_BANDS]; QMF_DELAY + MAX_SLOTS * 2],

            bw_array:           [0.0; SBR_BANDS],
            old_bw_array:       [0.0; SBR_BANDS],

            qmode:              QuantMode::Single,
            fclass:             FrameClass::FixFix,
            amp_res:            false,
            num_env:            0,
            prev_num_env:       0,
            freq_res:           [false; NUM_ENVELOPES],
            env_border:         [0; NUM_ENVELOPES],
            noise_env_border:   [0; 3],
            pointer:            0,
            num_noise:          0,
            last_env_end:       0,

            df_env:             [false; NUM_ENVELOPES],
            df_noise:           [false; 2],

            invf_mode:          [0; NUM_PATCHES],
            old_invf_mode:      [0; NUM_PATCHES],

            data_env:           [[0; SBR_BANDS]; NUM_PATCHES],
            data_noise:         [[0; SBR_BANDS]; NUM_PATCHES],
            data_env2:          [[0; SBR_BANDS]; NUM_PATCHES],
            data_noise2:        [[0; SBR_BANDS]; NUM_PATCHES],
            last_envelope:      [0; SBR_BANDS],
            last_noise_env:     [0; SBR_BANDS],
            last_freq_res:      false,

            add_harmonic:       [false; SBR_BANDS],
            prev_l_a:           -1,

            s_idx_mapped:       [[false; SBR_BANDS]; NUM_ENVELOPES],
            prev_s_idx_mapped:  [false; SBR_BANDS],
            index_sine:         0,
            index_noise:        0,
            g_temp:             [[0.0; SBR_BANDS]; MAX_SLOTS * 2 + QMF_DELAY + SMOOTH_DELAY],
            q_temp:             [[0.0; SBR_BANDS]; MAX_SLOTS * 2 + QMF_DELAY + SMOOTH_DELAY],
        }
    }

    pub fn reset(&mut self) {
        self.prev_y             = [[FFTC_ZERO; SBR_BANDS]; QMF_DELAY + MAX_SLOTS * 2];
        self.old_bw_array       = [0.0; SBR_BANDS];
        self.last_envelope      = [0; SBR_BANDS];
        self.last_noise_env     = [0; SBR_BANDS];
        self.last_freq_res      = false;
        self.last_env_end       = 0;
        self.prev_num_env       = 0;
        self.old_invf_mode      = [0; NUM_PATCHES];
        self.prev_s_idx_mapped  = [false; SBR_BANDS];
        self.index_sine         = 0;
        self.index_noise        = 0;
    }

    pub fn set_amp_res(&mut self, amp_res: bool) {
        if self.fclass != FrameClass::FixFix || self.num_env != 1 {
            self.amp_res = amp_res;
        } else {
            self.amp_res = false;
        }
    }

    pub fn analysis(&mut self, dsp: &mut SBRDSP, src: &[f32]) {
        for (src, dst) in src.chunks(32).zip(self.w[QMF_DELAY..].iter_mut()) {
            self.sbr_a.analysis(dsp, src, dst);
        }
    }
    pub fn synthesis(&mut self, dsp: &mut SBRDSP, dst: &mut [f32]) {
        for (src, dst) in self.x.iter().zip(dst.chunks_mut(64)) {
            self.sbr_s.synthesis(dsp, src, dst);
        }
    }
    pub fn bypass(&mut self) {
        self.x.copy_from_slice(&self.w);
    }
    pub fn hf_generate(&mut self, state: &SBRState) {
        for (x, w) in self.x.iter_mut().zip(self.w.iter()) {
            x[..state.k_x].copy_from_slice(&w[..state.k_x]);
            for el in x[state.k_x..].iter_mut() {
                *el = FFTC_ZERO;
            }
        }

        let mut phi = [[[FFTC_ZERO; SBR_BANDS]; 3]; 3];
        let mut a0 = [FFTC_ZERO; SBR_BANDS];
        let mut a1 = [FFTC_ZERO; SBR_BANDS];
        let k0 = state.f[0];
        for (i, phi) in phi.iter_mut().enumerate() {
            for (j, phi) in phi.iter_mut().enumerate().skip(1) {
                let src0 = &self.x[HF_ADJ - i..][..MAX_SLOTS * 2 + 6 - 1];
                let src1 = &self.x[HF_ADJ - j..][..MAX_SLOTS * 2 + 6 - 1];
                for (slot0, slot1) in src0.iter().zip(src1.iter()) {
                    for (k, phi) in phi.iter_mut().take(k0).enumerate() {
                        *phi += slot0[k] * !slot1[k];
                    }
                }
            }
        }
        for (k, (a0, a1)) in a0.iter_mut().zip(a1.iter_mut()).take(k0).enumerate() {
            let phi12 = phi[1][2][k];
            let d_k = phi[2][2][k].re * phi[1][1][k].re - phi12.sq_modulus() / (1.0 + 1.0e-6);

            if d_k != 0.0 {
                *a1 = (phi[0][1][k] * phi[1][2][k] - phi[0][2][k] * phi[1][1][k]).scale(1.0 / d_k);
            }
            if phi[1][1][k].re != 0.0 {
                *a0 = -(phi[0][1][k] + *a1 * !phi[1][2][k]).scale(1.0 / phi[1][1][k].re);
            }
            if a0.sq_modulus() >= 4.0*4.0 || a1.sq_modulus() >= 4.0*4.0 {
                *a0 = FFTC_ZERO;
                *a1 = FFTC_ZERO;
            }
        }

        for k in 0..state.num_noise_bands {
            let new_bw = NEW_BW[self.old_invf_mode[k] as usize][self.invf_mode[k] as usize];
            let old_bw = self.old_bw_array[k];
            let temp_bw = if new_bw < old_bw {
                    0.75    * new_bw + 0.25    * old_bw
                } else {
                    0.90625 * new_bw + 0.09375 * old_bw
                };
            self.bw_array[k] = if temp_bw >= 0.015625 {
                    temp_bw
                } else {
                    0.0
                };
        }

        for (l, x_high) in self.x_high.iter_mut().enumerate().skip(HF_ADJ).take(self.env_border[self.num_env - 1] * 2) {
            *x_high = [FFTC_ZERO; SBR_BANDS];
            let mut dst_k = state.k_x;
            for (&patch_start, &patch_len) in state.patch_start_subband[..state.num_patches].iter().zip(state.patch_num_subbands.iter()) {
                for (k, dst) in x_high[dst_k..][..patch_len].iter_mut().enumerate() {
                    let p = patch_start + k;
                    let cur_x = self.x[l][p];
                    let prev_x = self.x[l - 1][p];
                    let pprev_x = self.x[l - 2][p];
                    let g_k = match state.f_noise[..state.num_noise_bands].binary_search(&k) {
                            Ok(idx) | Err(idx) => idx.min(state.num_noise_bands - 1),
                        };
                    let bw_val = self.bw_array[g_k];
                    *dst = cur_x + a0[p] * prev_x.scale(bw_val) + a1[p] * pprev_x.scale(bw_val * bw_val);
                }
                dst_k += patch_len;
            }
        }
    }
    pub fn hf_adjust(&mut self, state: &SBRState, hdr: &SBRHeader) {
        const LIM_GAIN: [f32; 4] = [0.70795, 1.0, 1.41254, 10000.0];
        const H_SMOOTH: [f32; 5] = [
            1.0 / 3.0, 0.30150283239582, 0.21816949906249, 0.11516383427084, 0.03183050093751
        ];
        const PHI: [FFTComplex; 4] = [
            FFTComplex{ re:  1.0, im:  0.0 },
            FFTComplex{ re:  0.0, im:  1.0 },
            FFTComplex{ re: -1.0, im:  0.0 },
            FFTComplex{ re:  0.0, im: -1.0 },
        ];

        let kx = state.k_x;
        let km = state.f[state.num_master];
        let envelope_end = self.env_border[self.num_env - 1];

        let high_start = state.f[..=state.num_master].binary_search(&state.k_x).unwrap();
        let f_high = &state.f[..=state.num_master][high_start..];
        let f_low = &state.f_low[..=state.num_env_bands[0]];

        let l_a = match (self.fclass, self.pointer) {
                (_, 0) => -1,
                (FrameClass::FixFix, _) => -1,
                (FrameClass::FixVar, _) |
                (FrameClass::VarVar, _) => (self.num_env as i8) + 1 - (self.pointer as i8),
                (FrameClass::VarFix, 1) => -1,
                (FrameClass::VarFix, _) => (self.pointer as i8) - 1,
            };

        self.s_idx_mapped = [[false; SBR_BANDS]; NUM_ENVELOPES];
        for (l, s_idx_mapped) in self.s_idx_mapped[..self.num_env].iter_mut().enumerate() {
            let mut start = f_high[0];
            for (i, &end) in f_high.iter().skip(1).enumerate() {
                if self.add_harmonic[i] {
                    let mid = (start + end) / 2;
                    if ((l as i8) >= l_a) || self.prev_s_idx_mapped[mid] {
                        s_idx_mapped[mid] = true;
                    }
                }
                start = end;
            }
        }
        self.prev_s_idx_mapped = self.s_idx_mapped[self.num_env - 1];

        let mut s_mapped = [[false; SBR_BANDS]; NUM_ENVELOPES];
        for ((s_mapped, s_idx_mapped), &freq_res) in s_mapped.iter_mut().zip(self.s_idx_mapped[..self.num_env].iter()).zip(self.freq_res.iter()) {
            let mut band_start = kx;
            if freq_res {
                for (&add_sine, &band_end) in self.add_harmonic.iter().zip(f_high[1..].iter()) {
                    for el in s_mapped[band_start..band_end].iter_mut() {
                        *el = add_sine;
                    }
                    band_start = band_end;
                }
            } else {
                for &band_end in f_low[1..].iter() {
                    let add_sine = s_idx_mapped[band_start..band_end].contains(&true);
                    for el in s_mapped[band_start..band_end].iter_mut() {
                        *el = add_sine;
                    }
                    band_start = band_end;
                }
            }
        }

        let mut e_orig_mapped = [[0.0; SBR_BANDS]; NUM_ENVELOPES];
        let (a, pan_offset) = if self.amp_res { (1.0, 12.0) } else { (0.5, 24.0) };
        match self.qmode {
            QuantMode::Single => {
                for (dst, (src, &freq_res)) in e_orig_mapped[..self.num_env].iter_mut().zip(self.data_env.iter().zip(self.freq_res.iter())) {
                    let bands = if freq_res { f_high } else { f_low };
                    let mut start = kx;
                    for (&val, &band_end) in src.iter().zip(bands.iter().skip(1)) {
                        let scale = 2.0f32.powf(6.0 + f32::from(val) * a);
                        for dst in dst[start..band_end].iter_mut() {
                            *dst = scale;
                        }
                        start = band_end;
                    }
                }
            },
            QuantMode::Left => {
                for (dst, ((e0, e1), &freq_res)) in e_orig_mapped[..self.num_env].iter_mut().zip(self.data_env.iter().zip(self.data_env2.iter()).zip(self.freq_res.iter())) {
                    let bands = if freq_res { f_high } else { f_low };
                    let mut start = kx;
                    for ((&e0, &e1), &band_end) in e0.iter().zip(e1.iter()).zip(bands.iter().skip(1)) {
                        let scale = 2.0f32.powf(6.0 + f32::from(e0) * a + 1.0) / (1.0 + 2.0f32.powf((pan_offset - f32::from(e1)) * a));
                        for dst in dst[start..band_end].iter_mut() {
                            *dst = scale;
                        }
                        start = band_end;
                    }
                }
            },
            QuantMode::Right => {
                for (dst, ((e0, e1), &freq_res)) in e_orig_mapped[..self.num_env].iter_mut().zip(self.data_env2.iter().zip(self.data_env.iter()).zip(self.freq_res.iter())) {
                    let bands = if freq_res { f_high } else { f_low };
                    let mut start = kx;
                    for ((&e0, &e1), &band_end) in e0.iter().zip(e1.iter()).zip(bands.iter().skip(1)) {
                        let scale = 2.0f32.powf(6.0 + f32::from(e0) * a + 1.0) / (1.0 + 2.0f32.powf((f32::from(e1) - pan_offset) * a));
                        for dst in dst[start..band_end].iter_mut() {
                            *dst = scale;
                        }
                        start = band_end;
                    }
                }
            }
        };
        let mut q_mapped = [[0.0; SBR_BANDS]; NUM_ENVELOPES];
        let mut start = 0;
        let noise_env = [0, self.noise_env_border[0], self.noise_env_border[1]];
        match self.qmode {
            QuantMode::Single => {
                for (env_no, &env_end) in self.env_border[..self.num_env].iter().enumerate() {
                    let env_end = env_end;
                    let mut noise_env_no = 0;
                    for nenv in 0..self.num_noise {
                        if (start >= noise_env[nenv]) && (env_end <= noise_env[nenv + 1]) {
                            noise_env_no = nenv;
                            break;
                        }
                    }
                    let mut band_start = state.f_noise[0];
                    for (noise_band, &band_end) in state.f_noise[1..=state.num_noise_bands].iter().enumerate() {
                        let scale = 2.0f32.powf(6.0 - f32::from(self.data_noise[noise_env_no][noise_band]));
                        for el in q_mapped[env_no][band_start..band_end].iter_mut() {
                            *el = scale;
                        }
                        band_start = band_end;
                    }
                    start = env_end;
                }
            },
            QuantMode::Left => {
                for (env_no, &env_end) in self.env_border[..self.num_env].iter().enumerate() {
                    let env_end = env_end;
                    let mut noise_env_no = 0;
                    for nenv in 0..self.num_noise {
                        if (start >= noise_env[nenv]) && (env_end <= noise_env[nenv + 1]) {
                            noise_env_no = nenv;
                            break;
                        }
                    }
                    let mut band_start = state.f_noise[0];
                    for (noise_band, &band_end) in state.f_noise[1..=state.num_noise_bands].iter().enumerate() {
                        let scale = 2.0f32.powf(6.0 - f32::from(self.data_noise[noise_env_no][noise_band]) + 1.0) / (1.0 + 2.0f32.powf(12.0 - f32::from(self.data_noise2[noise_env_no][noise_band])));
                        for el in q_mapped[env_no][band_start..band_end].iter_mut() {
                            *el = scale;
                        }
                        band_start = band_end;
                    }
                    start = env_end;
                }
            },
            QuantMode::Right => {
                for (env_no, &env_end) in self.env_border[..self.num_env].iter().enumerate() {
                    let env_end = env_end;
                    let mut noise_env_no = 0;
                    for nenv in 0..self.num_noise {
                        if (start >= noise_env[nenv]) && (env_end <= noise_env[nenv + 1]) {
                            noise_env_no = nenv;
                            break;
                        }
                    }
                    let mut band_start = state.f_noise[0];
                    for (noise_band, &band_end) in state.f_noise[1..=state.num_noise_bands].iter().enumerate() {
                        let scale = 2.0f32.powf(6.0 - f32::from(self.data_noise2[noise_env_no][noise_band]) + 1.0) / (1.0 + 2.0f32.powf(f32::from(self.data_noise[noise_env_no][noise_band]) - 12.0));
                        for el in q_mapped[env_no][band_start..band_end].iter_mut() {
                            *el = scale;
                        }
                        band_start = band_end;
                    }
                    start = env_end;
                }
            },
        };

        let mut start = 0;
        let mut e_curr = [[0.0f32; SBR_BANDS]; NUM_ENVELOPES];
        for (e_curr, &env_end) in e_curr.iter_mut().zip(self.env_border[..self.num_env].iter()) {
            for slot in self.x_high[HF_ADJ..][(start * 2)..(env_end * 2)].iter() {
                for (dst, x) in e_curr[kx..km].iter_mut().zip(slot[kx..km].iter()) {
                    *dst += x.sq_modulus();
                }
            }
            for el in e_curr[kx..km].iter_mut() {
                *el *= RANGE * RANGE;
                *el /= ((env_end - start) * 2) as f32;
            }
            start = env_end;
        }

        const EPS: f32 = 1.0;
        const EPS0: f32 = 1.0e-12;
        let la_prev = if self.prev_l_a == (self.prev_num_env as i8) { 0 } else { -1 };
        let mut g_max_tmp;
        let mut g_boost_tmp;
        let mut g = [0.0; SBR_BANDS];
        let mut q_m = [0.0; SBR_BANDS];
        let mut s_m = [0.0; SBR_BANDS];
        let mut q_m_lim = [0.0; SBR_BANDS];
        let mut g_lim = [0.0; SBR_BANDS];
        let mut g_lim_boost = [[0.0; SBR_BANDS]; NUM_ENVELOPES];
        let mut q_m_lim_boost = [[0.0; SBR_BANDS]; NUM_ENVELOPES];
        let mut s_m_boost = [[0.0; SBR_BANDS]; NUM_ENVELOPES];
        for env in 0..self.num_env {
            let mut start = kx;
            g_max_tmp = [0.0; SBR_BANDS];
            g_boost_tmp = [0.0; SBR_BANDS];
            for (dst, &end) in g_max_tmp.iter_mut().zip(state.f_lim[1..=state.num_lim].iter()) {
                let mut e_o_sum = EPS0;
                let mut e_c_sum = EPS0;
                for k in start..end {
                    e_o_sum += e_orig_mapped[env][k] as f32;
                    e_c_sum += e_curr[env][k];
                }
                *dst = (e_o_sum / e_c_sum).sqrt() * LIM_GAIN[hdr.limiter_gains as usize];
                start = end;
            }
            for k in kx..km {
                let e_orig = e_orig_mapped[env][k] as f32;
                let q_orig = q_mapped[env][k] as f32;
                let e_curr = e_curr[env][k];

                q_m[k] = (e_orig * q_orig / (1.0 + q_orig)).sqrt();
                s_m[k] = if self.s_idx_mapped[env][k] { (e_orig / (1.0 + q_orig)).sqrt() } else { 0.0 };
                g[k] = if !s_mapped[env][k] {
                        let q_add = if (env as i8) != l_a && (env as i8) != la_prev { q_orig } else { 0.0 };
                        (e_orig / ((EPS + e_curr) * (1.0 + q_add))).sqrt()
                    } else {
                        (e_orig / (EPS + e_curr) * q_orig / (1.0 + q_orig)).sqrt()
                    };

                let mut lidx = 0;
                for i in 0..state.num_lim {
                    if (state.f_lim[i] <= k) && (k < state.f_lim[i + 1]) {
                        lidx = i;
                        break;
                    }
                }

                let g_max = g_max_tmp[lidx].min(1.0e5);
                q_m_lim[k] = q_m[k].min(q_m[k] * g_max / g[k]);
                g_lim[k] = g[k].min(g_max);
            }
            let mut start = kx;
            for (lim_no, dst) in g_boost_tmp[..state.num_lim].iter_mut().enumerate() {
                let end = state.f_lim[lim_no + 1];
                let mut nsum = EPS0;
                let mut dsum = EPS0;
                for k in start..end {
                    nsum += e_orig_mapped[env][k] as f32;
                    dsum += e_curr[env][k] * g_lim[k] * g_lim[k];
                    if s_m[k] != 0.0 || (env as i8) == l_a || (env as i8) == la_prev {
                        dsum += s_m[k] * s_m[k];
                    } else {
                        dsum += q_m_lim[k] * q_m_lim[k];
                    }
                }
                *dst = (nsum / dsum).sqrt();
                let g_boost = dst.min(1.584893192);
                for k in start..end {
                    g_lim_boost[env][k] = g_lim[k] * g_boost;
                    q_m_lim_boost[env][k] = q_m_lim[k] * g_boost;
                    s_m_boost[env][k] = s_m[k] * g_boost;
                }
                start = end;
            }
        }

        let mut env_map = [0; MAX_SLOTS * 2 + QMF_DELAY];
        let mut start = 0;
        for (env, &env_end) in self.env_border[..self.num_env].iter().enumerate() {
            for l in (start * 2)..(env_end * 2) {
                env_map[l] = env;
            }
            start = env_end;
        }

        let (ghead, gcur) = self.g_temp.split_at_mut(SMOOTH_DELAY);
        let (qhead, qcur) = self.q_temp.split_at_mut(SMOOTH_DELAY);
        if self.last_env_end > 0 {
            ghead.copy_from_slice(&gcur[self.last_env_end - SMOOTH_DELAY..][..SMOOTH_DELAY]);
            qhead.copy_from_slice(&qcur[self.last_env_end - SMOOTH_DELAY..][..SMOOTH_DELAY]);
            let mut start = 0;
            for (&env_end, (g_lim, q_lim)) in self.env_border[..self.num_env].iter().zip(g_lim_boost.iter().zip(q_m_lim_boost.iter())) {
                for slot in (start * 2)..(env_end * 2) {
                    gcur[slot] = *g_lim;
                    qcur[slot] = *q_lim;
                }
                start = env_end;
            }
        } else {
            for dst in ghead.iter_mut() {
                *dst = g_lim_boost[0];
            }
            for dst in qhead.iter_mut() {
                *dst = q_m_lim_boost[0];
            }
            let mut start = 0;
            for (&env_end, (g_lim, q_lim)) in self.env_border[..self.num_env].iter().zip(g_lim_boost.iter().zip(q_m_lim_boost.iter())) {
                for slot in (start * 2)..(env_end * 2) {
                    gcur[slot] = *g_lim;
                    qcur[slot] = *q_lim;
                }
                start = env_end;
            }
        }

        let mut g_filt = [[0.0; SBR_BANDS]; MAX_SLOTS * 2 + QMF_DELAY];
        let mut q_filt = [[0.0; SBR_BANDS]; MAX_SLOTS * 2 + QMF_DELAY];
        if !hdr.smoothing_mode {
            for slot in 0..(envelope_end * 2) {
                if (slot as i8) == (la_prev * 2) {
                    g_filt[slot].copy_from_slice(&self.g_temp[slot + SMOOTH_DELAY]);
                    q_filt[slot].copy_from_slice(&self.q_temp[slot + SMOOTH_DELAY]);
                    continue;
                }
                for k in kx..km {
                    let mut gsum = 0.0;
                    let mut qsum = 0.0;
                    for (i, &coef) in H_SMOOTH.iter().enumerate() {
                        gsum += self.g_temp[slot + SMOOTH_DELAY - i][k] * coef;
                        qsum += self.q_temp[slot + SMOOTH_DELAY - i][k] * coef;
                    }
                    g_filt[slot][k] = gsum;
                    q_filt[slot][k] = qsum;
                }
            }
        } else {
            g_filt.copy_from_slice(gcur);
            q_filt.copy_from_slice(qcur);
        }

        let index_noise = self.index_noise.wrapping_sub(self.env_border[0] * 2) & 511;
        for (slot, y) in self.y.iter_mut().skip(HF_ADJ).take(envelope_end * 2).enumerate() {
            for (k, y) in y.iter_mut().enumerate().skip(kx).take(km - kx) {
                *y = self.x_high[HF_ADJ + slot][k].scale(g_filt[slot][k]);

                let smb = s_m_boost[env_map[slot]][k] / RANGE;
                if smb != 0.0 {
                    let mut s = FFTComplex { re: smb, im: smb };
                    if (k & 1) != 0 {
                        s = !s;
                    }
                    y.re += s.re * PHI[self.index_sine].re;
                    y.im += s.im * PHI[self.index_sine].im;
                } else {
                    *y += SBR_NOISE_TABLE[(index_noise + slot * SBR_BANDS + k - kx + 1) & 511].scale(q_filt[slot][k] / RANGE);
                }
            }
            self.index_sine = (self.index_sine + 1) & 3;
        }
        self.index_noise = (index_noise + km - kx) & 511;

        let end = if self.last_env_end != 0 {
                (self.last_env_end - MAX_SLOTS) * 2
            } else {
                0
            };
        self.last_env_end = envelope_end;
        for (i, x) in self.x[..end].iter_mut().enumerate() {
            x[state.k_x..].copy_from_slice(&self.prev_y[HF_ADJ + MAX_SLOTS * 2 + i][state.k_x..]);
        }
        for (x, y) in self.x[end..].iter_mut().zip(self.y[HF_ADJ + end..].iter()) {
            x[state.k_x..].copy_from_slice(&y[state.k_x..]);
        }

        self.prev_l_a = l_a;
    }
    pub fn update_frame(&mut self) {
        let (start, tail) = self.w.split_at_mut(QMF_DELAY);
        start.copy_from_slice(&tail[tail.len() - QMF_DELAY..]);
        self.prev_y = self.y;
        self.old_invf_mode = self.invf_mode;
        self.old_bw_array = self.bw_array;

        self.prev_num_env = self.num_env;
    }
}

const SBR_NOISE_TABLE: [FFTComplex; 512] = [
    FFTComplex{ re: -0.99948153278296, im: -0.59483417516607 },
    FFTComplex{ re:  0.97113454393991, im: -0.67528515225647 },
    FFTComplex{ re:  0.14130051758487, im: -0.95090983575689 },
    FFTComplex{ re: -0.47005496701697, im: -0.37340549728647 },
    FFTComplex{ re:  0.80705063769351, im:  0.29653668284408 },
    FFTComplex{ re: -0.38981478896926, im:  0.89572605717087 },
    FFTComplex{ re: -0.01053049862020, im: -0.66959058036166 },
    FFTComplex{ re: -0.91266367957293, im: -0.11522938140034 },
    FFTComplex{ re:  0.54840422910309, im:  0.75221367176302 },
    FFTComplex{ re:  0.40009252867955, im: -0.98929400334421 },
    FFTComplex{ re: -0.99867974711855, im: -0.88147068645358 },
    FFTComplex{ re: -0.95531076805040, im:  0.90908757154593 },
    FFTComplex{ re: -0.45725933317144, im: -0.56716323646760 },
    FFTComplex{ re: -0.72929675029275, im: -0.98008272727324 },
    FFTComplex{ re:  0.75622801399036, im:  0.20950329995549 },
    FFTComplex{ re:  0.07069442601050, im: -0.78247898470706 },
    FFTComplex{ re:  0.74496252926055, im: -0.91169004445807 },
    FFTComplex{ re: -0.96440182703856, im: -0.94739918296622 },
    FFTComplex{ re:  0.30424629369539, im: -0.49438267012479 },
    FFTComplex{ re:  0.66565033746925, im:  0.64652935542491 },
    FFTComplex{ re:  0.91697008020594, im:  0.17514097332009 },
    FFTComplex{ re: -0.70774918760427, im:  0.52548653416543 },
    FFTComplex{ re: -0.70051415345560, im: -0.45340028808763 },
    FFTComplex{ re: -0.99496513054797, im: -0.90071908066973 },
    FFTComplex{ re:  0.98164490790123, im: -0.77463155528697 },
    FFTComplex{ re: -0.54671580548181, im: -0.02570928536004 },
    FFTComplex{ re: -0.01689629065389, im:  0.00287506445732 },
    FFTComplex{ re: -0.86110349531986, im:  0.42548583726477 },
    FFTComplex{ re: -0.98892980586032, im: -0.87881132267556 },
    FFTComplex{ re:  0.51756627678691, im:  0.66926784710139 },
    FFTComplex{ re: -0.99635026409640, im: -0.58107730574765 },
    FFTComplex{ re: -0.99969370862163, im:  0.98369989360250 },
    FFTComplex{ re:  0.55266258627194, im:  0.59449057465591 },
    FFTComplex{ re:  0.34581177741673, im:  0.94879421061866 },
    FFTComplex{ re:  0.62664209577999, im: -0.74402970906471 },
    FFTComplex{ re: -0.77149701404973, im: -0.33883658042801 },
    FFTComplex{ re: -0.91592244254432, im:  0.03687901376713 },
    FFTComplex{ re: -0.76285492357887, im: -0.91371867919124 },
    FFTComplex{ re:  0.79788337195331, im: -0.93180971199849 },
    FFTComplex{ re:  0.54473080610200, im: -0.11919206037186 },
    FFTComplex{ re: -0.85639281671058, im:  0.42429854760451 },
    FFTComplex{ re: -0.92882402971423, im:  0.27871809078609 },
    FFTComplex{ re: -0.11708371046774, im: -0.99800843444966 },
    FFTComplex{ re:  0.21356749817493, im: -0.90716295627033 },
    FFTComplex{ re: -0.76191692573909, im:  0.99768118356265 },
    FFTComplex{ re:  0.98111043100884, im: -0.95854459734407 },
    FFTComplex{ re: -0.85913269895572, im:  0.95766566168880 },
    FFTComplex{ re: -0.93307242253692, im:  0.49431757696466 },
    FFTComplex{ re:  0.30485754879632, im: -0.70540034357529 },
    FFTComplex{ re:  0.85289650925190, im:  0.46766131791044 },
    FFTComplex{ re:  0.91328082618125, im: -0.99839597361769 },
    FFTComplex{ re: -0.05890199924154, im:  0.70741827819497 },
    FFTComplex{ re:  0.28398686150148, im:  0.34633555702188 },
    FFTComplex{ re:  0.95258164539612, im: -0.54893416026939 },
    FFTComplex{ re: -0.78566324168507, im: -0.75568541079691 },
    FFTComplex{ re: -0.95789495447877, im: -0.20423194696966 },
    FFTComplex{ re:  0.82411158711197, im:  0.96654618432562 },
    FFTComplex{ re: -0.65185446735885, im: -0.88734990773289 },
    FFTComplex{ re: -0.93643603134666, im:  0.99870790442385 },
    FFTComplex{ re:  0.91427159529618, im: -0.98290505544444 },
    FFTComplex{ re: -0.70395684036886, im:  0.58796798221039 },
    FFTComplex{ re:  0.00563771969365, im:  0.61768196727244 },
    FFTComplex{ re:  0.89065051931895, im:  0.52783352697585 },
    FFTComplex{ re: -0.68683707712762, im:  0.80806944710339 },
    FFTComplex{ re:  0.72165342518718, im: -0.69259857349564 },
    FFTComplex{ re: -0.62928247730667, im:  0.13627037407335 },
    FFTComplex{ re:  0.29938434065514, im: -0.46051329682246 },
    FFTComplex{ re: -0.91781958879280, im: -0.74012716684186 },
    FFTComplex{ re:  0.99298717043688, im:  0.40816610075661 },
    FFTComplex{ re:  0.82368298622748, im: -0.74036047190173 },
    FFTComplex{ re: -0.98512833386833, im: -0.99972330709594 },
    FFTComplex{ re: -0.95915368242257, im: -0.99237800466040 },
    FFTComplex{ re: -0.21411126572790, im: -0.93424819052545 },
    FFTComplex{ re: -0.68821476106884, im: -0.26892306315457 },
    FFTComplex{ re:  0.91851997982317, im:  0.09358228901785 },
    FFTComplex{ re: -0.96062769559127, im:  0.36099095133739 },
    FFTComplex{ re:  0.51646184922287, im: -0.71373332873917 },
    FFTComplex{ re:  0.61130721139669, im:  0.46950141175917 },
    FFTComplex{ re:  0.47336129371299, im: -0.27333178296162 },
    FFTComplex{ re:  0.90998308703519, im:  0.96715662938132 },
    FFTComplex{ re:  0.44844799194357, im:  0.99211574628306 },
    FFTComplex{ re:  0.66614891079092, im:  0.96590176169121 },
    FFTComplex{ re:  0.74922239129237, im: -0.89879858826087 },
    FFTComplex{ re: -0.99571588506485, im:  0.52785521494349 },
    FFTComplex{ re:  0.97401082477563, im: -0.16855870075190 },
    FFTComplex{ re:  0.72683747733879, im: -0.48060774432251 },
    FFTComplex{ re:  0.95432193457128, im:  0.68849603408441 },
    FFTComplex{ re: -0.72962208425191, im: -0.76608443420917 },
    FFTComplex{ re: -0.85359479233537, im:  0.88738125901579 },
    FFTComplex{ re: -0.81412430338535, im: -0.97480768049637 },
    FFTComplex{ re: -0.87930772356786, im:  0.74748307690436 },
    FFTComplex{ re: -0.71573331064977, im: -0.98570608178923 },
    FFTComplex{ re:  0.83524300028228, im:  0.83702537075163 },
    FFTComplex{ re: -0.48086065601423, im: -0.98848504923531 },
    FFTComplex{ re:  0.97139128574778, im:  0.80093621198236 },
    FFTComplex{ re:  0.51992825347895, im:  0.80247631400510 },
    FFTComplex{ re: -0.00848591195325, im: -0.76670128000486 },
    FFTComplex{ re: -0.70294374303036, im:  0.55359910445577 },
    FFTComplex{ re: -0.95894428168140, im: -0.43265504344783 },
    FFTComplex{ re:  0.97079252950321, im:  0.09325857238682 },
    FFTComplex{ re: -0.92404293670797, im:  0.85507704027855 },
    FFTComplex{ re: -0.69506469500450, im:  0.98633412625459 },
    FFTComplex{ re:  0.26559203620024, im:  0.73314307966524 },
    FFTComplex{ re:  0.28038443336943, im:  0.14537913654427 },
    FFTComplex{ re: -0.74138124825523, im:  0.99310339807762 },
    FFTComplex{ re: -0.01752795995444, im: -0.82616635284178 },
    FFTComplex{ re: -0.55126773094930, im: -0.98898543862153 },
    FFTComplex{ re:  0.97960898850996, im: -0.94021446752851 },
    FFTComplex{ re: -0.99196309146936, im:  0.67019017358456 },
    FFTComplex{ re: -0.67684928085260, im:  0.12631491649378 },
    FFTComplex{ re:  0.09140039465500, im: -0.20537731453108 },
    FFTComplex{ re: -0.71658965751996, im: -0.97788200391224 },
    FFTComplex{ re:  0.81014640078925, im:  0.53722648362443 },
    FFTComplex{ re:  0.40616991671205, im: -0.26469008598449 },
    FFTComplex{ re: -0.67680188682972, im:  0.94502052337695 },
    FFTComplex{ re:  0.86849774348749, im: -0.18333598647899 },
    FFTComplex{ re: -0.99500381284851, im: -0.02634122068550 },
    FFTComplex{ re:  0.84329189340667, im:  0.10406957462213 },
    FFTComplex{ re: -0.09215968531446, im:  0.69540012101253 },
    FFTComplex{ re:  0.99956173327206, im: -0.12358542001404 },
    FFTComplex{ re: -0.79732779473535, im: -0.91582524736159 },
    FFTComplex{ re:  0.96349973642406, im:  0.96640458041000 },
    FFTComplex{ re: -0.79942778496547, im:  0.64323902822857 },
    FFTComplex{ re: -0.11566039853896, im:  0.28587846253726 },
    FFTComplex{ re: -0.39922954514662, im:  0.94129601616966 },
    FFTComplex{ re:  0.99089197565987, im: -0.92062625581587 },
    FFTComplex{ re:  0.28631285179909, im: -0.91035047143603 },
    FFTComplex{ re: -0.83302725605608, im: -0.67330410892084 },
    FFTComplex{ re:  0.95404443402072, im:  0.49162765398743 },
    FFTComplex{ re: -0.06449863579434, im:  0.03250560813135 },
    FFTComplex{ re: -0.99575054486311, im:  0.42389784469507 },
    FFTComplex{ re: -0.65501142790847, im:  0.82546114655624 },
    FFTComplex{ re: -0.81254441908887, im: -0.51627234660629 },
    FFTComplex{ re: -0.99646369485481, im:  0.84490533520752 },
    FFTComplex{ re:  0.00287840603348, im:  0.64768261158166 },
    FFTComplex{ re:  0.70176989408455, im: -0.20453028573322 },
    FFTComplex{ re:  0.96361882270190, im:  0.40706967140989 },
    FFTComplex{ re: -0.68883758192426, im:  0.91338958840772 },
    FFTComplex{ re: -0.34875585502238, im:  0.71472290693300 },
    FFTComplex{ re:  0.91980081243087, im:  0.66507455644919 },
    FFTComplex{ re: -0.99009048343881, im:  0.85868021604848 },
    FFTComplex{ re:  0.68865791458395, im:  0.55660316809678 },
    FFTComplex{ re: -0.99484402129368, im: -0.20052559254934 },
    FFTComplex{ re:  0.94214511408023, im: -0.99696425367461 },
    FFTComplex{ re: -0.67414626793544, im:  0.49548221180078 },
    FFTComplex{ re: -0.47339353684664, im: -0.85904328834047 },
    FFTComplex{ re:  0.14323651387360, im: -0.94145598222488 },
    FFTComplex{ re: -0.29268293575672, im:  0.05759224927952 },
    FFTComplex{ re:  0.43793861458754, im: -0.78904969892724 },
    FFTComplex{ re: -0.36345126374441, im:  0.64874435357162 },
    FFTComplex{ re: -0.08750604656825, im:  0.97686944362527 },
    FFTComplex{ re: -0.96495267812511, im: -0.53960305946511 },
    FFTComplex{ re:  0.55526940659947, im:  0.78891523734774 },
    FFTComplex{ re:  0.73538215752630, im:  0.96452072373404 },
    FFTComplex{ re: -0.30889773919437, im: -0.80664389776860 },
    FFTComplex{ re:  0.03574995626194, im: -0.97325616900959 },
    FFTComplex{ re:  0.98720684660488, im:  0.48409133691962 },
    FFTComplex{ re: -0.81689296271203, im: -0.90827703628298 },
    FFTComplex{ re:  0.67866860118215, im:  0.81284503870856 },
    FFTComplex{ re: -0.15808569732583, im:  0.85279555024382 },
    FFTComplex{ re:  0.80723395114371, im: -0.24717418514605 },
    FFTComplex{ re:  0.47788757329038, im: -0.46333147839295 },
    FFTComplex{ re:  0.96367554763201, im:  0.38486749303242 },
    FFTComplex{ re: -0.99143875716818, im: -0.24945277239809 },
    FFTComplex{ re:  0.83081876925833, im: -0.94780851414763 },
    FFTComplex{ re: -0.58753191905341, im:  0.01290772389163 },
    FFTComplex{ re:  0.95538108220960, im: -0.85557052096538 },
    FFTComplex{ re: -0.96490920476211, im: -0.64020970923102 },
    FFTComplex{ re: -0.97327101028521, im:  0.12378128133110 },
    FFTComplex{ re:  0.91400366022124, im:  0.57972471346930 },
    FFTComplex{ re: -0.99925837363824, im:  0.71084847864067 },
    FFTComplex{ re: -0.86875903507313, im: -0.20291699203564 },
    FFTComplex{ re: -0.26240034795124, im: -0.68264554369108 },
    FFTComplex{ re: -0.24664412953388, im: -0.87642273115183 },
    FFTComplex{ re:  0.02416275806869, im:  0.27192914288905 },
    FFTComplex{ re:  0.82068619590515, im: -0.85087787994476 },
    FFTComplex{ re:  0.88547373760759, im: -0.89636802901469 },
    FFTComplex{ re: -0.18173078152226, im: -0.26152145156800 },
    FFTComplex{ re:  0.09355476558534, im:  0.54845123045604 },
    FFTComplex{ re: -0.54668414224090, im:  0.95980774020221 },
    FFTComplex{ re:  0.37050990604091, im: -0.59910140383171 },
    FFTComplex{ re: -0.70373594262891, im:  0.91227665827081 },
    FFTComplex{ re: -0.34600785879594, im: -0.99441426144200 },
    FFTComplex{ re: -0.68774481731008, im: -0.30238837956299 },
    FFTComplex{ re: -0.26843291251234, im:  0.83115668004362 },
    FFTComplex{ re:  0.49072334613242, im: -0.45359708737775 },
    FFTComplex{ re:  0.38975993093975, im:  0.95515358099121 },
    FFTComplex{ re: -0.97757125224150, im:  0.05305894580606 },
    FFTComplex{ re: -0.17325552859616, im: -0.92770672250494 },
    FFTComplex{ re:  0.99948035025744, im:  0.58285545563426 },
    FFTComplex{ re: -0.64946246527458, im:  0.68645507104960 },
    FFTComplex{ re: -0.12016920576437, im: -0.57147322153312 },
    FFTComplex{ re: -0.58947456517751, im: -0.34847132454388 },
    FFTComplex{ re: -0.41815140454465, im:  0.16276422358861 },
    FFTComplex{ re:  0.99885650204884, im:  0.11136095490444 },
    FFTComplex{ re: -0.56649614128386, im: -0.90494866361587 },
    FFTComplex{ re:  0.94138021032330, im:  0.35281916733018 },
    FFTComplex{ re: -0.75725076534641, im:  0.53650549640587 },
    FFTComplex{ re:  0.20541973692630, im: -0.94435144369918 },
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