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Copy pathgrain.rs
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276 lines (267 loc) · 11.2 KB
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//! Film grain synthesis (7.18.3), applied to output pictures only (references stay clean).
use crate::Picture;
use crate::header::{FilmGrainParams, SequenceHeader};
use crate::spec_tables::{GAUSSIAN_SEQUENCE, MC_IDENTITY};
#[inline]
fn round2(x: i32, n: u32) -> i32 {
if n == 0 { x } else { (x + (1 << (n - 1))) >> n }
}
struct Rng(u32);
impl Rng {
/// get_random_number( bits ) (7.18.3.2)
fn next(&mut self, bits: u32) -> i32 {
let r = self.0;
let bit = (r ^ (r >> 1) ^ (r >> 3) ^ (r >> 12)) & 1;
let r = (r >> 1) | (bit << 15);
self.0 = r;
((r >> (16 - bits)) & ((1 << bits) - 1)) as i32
}
}
pub(crate) fn apply(pic: &mut Picture, g: &FilmGrainParams, seq: &SequenceHeader) {
let _ = seq;
let bd = pic.bit_depth as u32;
let mono = pic.mono_chrome;
let num_planes = if mono { 1 } else { 3 };
let (sub_x, sub_y) = (pic.subsampling_x as usize, pic.subsampling_y as usize);
let w = pic.width as usize;
let h = pic.height as usize;
let grain_center = 128i32 << (bd - 8);
let grain_min = -grain_center;
let grain_max = (256i32 << (bd - 8)) - 1 - grain_center;
// Generate grain (7.18.3.3).
let mut rng = Rng(g.grain_seed);
let shift = 12 - bd + g.grain_scale_shift;
let mut luma = vec![[0i32; 82]; 73];
for row in luma.iter_mut() {
for v in row.iter_mut() {
let gv = if g.num_y_points > 0 { GAUSSIAN_SEQUENCE[rng.next(11) as usize] as i32 } else { 0 };
*v = round2(gv, shift);
}
}
let ar_shift = g.ar_coeff_shift_minus_6 + 6;
let lag = g.ar_coeff_lag as i32;
for y in 3..73 {
for x in 3..82 - 3 {
let mut s = 0;
let mut pos = 0;
'outer: for dr in -lag..=0 {
for dc in -lag..=lag {
if dr == 0 && dc == 0 {
break 'outer;
}
let c = g.ar_coeffs_y_plus_128[pos] as i32 - 128;
s += luma[(y as i32 + dr) as usize][(x as i32 + dc) as usize] * c;
pos += 1;
}
}
luma[y][x] = (luma[y][x] + round2(s, ar_shift)).clamp(grain_min, grain_max);
}
}
let chroma_w = if sub_x != 0 { 44 } else { 82 };
let chroma_h = if sub_y != 0 { 38 } else { 73 };
let mut cb = vec![[0i32; 82]; 73];
let mut cr = vec![[0i32; 82]; 73];
if !mono {
for (arr, seed, on) in [(&mut cb, 0xb524u32, g.num_cb_points > 0), (&mut cr, 0x49d8, g.num_cr_points > 0)] {
rng.0 = g.grain_seed ^ seed;
for row in arr.iter_mut().take(chroma_h) {
for v in row.iter_mut().take(chroma_w) {
let gv = if on || g.chroma_scaling_from_luma { GAUSSIAN_SEQUENCE[rng.next(11) as usize] as i32 } else { 0 };
*v = round2(gv, shift);
}
}
}
for y in 3..chroma_h {
for x in 3..chroma_w - 3 {
let mut s0 = 0;
let mut s1 = 0;
let mut pos = 0;
'outer: for dr in -lag..=0 {
for dc in -lag..=lag {
let c0 = g.ar_coeffs_cb_plus_128[pos] as i32 - 128;
let c1 = g.ar_coeffs_cr_plus_128[pos] as i32 - 128;
if dr == 0 && dc == 0 {
if g.num_y_points > 0 {
let mut l = 0;
let lx = ((x - 3) << sub_x) + 3;
let ly = ((y - 3) << sub_y) + 3;
for i in 0..=sub_y {
for j in 0..=sub_x {
l += luma[ly + i][lx + j];
}
}
let l = round2(l, (sub_x + sub_y) as u32);
s0 += l * c0;
s1 += l * c1;
}
break 'outer;
}
let (yy, xx) = ((y as i32 + dr) as usize, (x as i32 + dc) as usize);
s0 += cb[yy][xx] * c0;
s1 += cr[yy][xx] * c1;
pos += 1;
}
}
cb[y][x] = (cb[y][x] + round2(s0, ar_shift)).clamp(grain_min, grain_max);
cr[y][x] = (cr[y][x] + round2(s1, ar_shift)).clamp(grain_min, grain_max);
}
}
}
// Scaling lookup (7.18.3.4).
let mut lut = [[0i32; 256]; 3];
for (plane, l) in lut.iter_mut().enumerate().take(num_planes) {
let (n, xs, ys) = if plane == 0 || g.chroma_scaling_from_luma {
(g.num_y_points, &g.point_y_value, &g.point_y_scaling)
} else if plane == 1 {
(g.num_cb_points, &g.point_cb_value, &g.point_cb_scaling)
} else {
(g.num_cr_points, &g.point_cr_value, &g.point_cr_scaling)
};
if n == 0 {
continue;
}
for v in l.iter_mut().take(xs[0] as usize) {
*v = ys[0] as i32;
}
for i in 0..n - 1 {
let dy = ys[i + 1] as i32 - ys[i] as i32;
let dx = xs[i + 1] as i32 - xs[i] as i32;
let delta = dy * ((65536 + (dx >> 1)) / dx);
for x in 0..dx {
l[xs[i] as usize + x as usize] = ys[i] as i32 + ((x * delta + 32768) >> 16);
}
}
for v in l.iter_mut().skip(xs[n - 1] as usize) {
*v = ys[n - 1] as i32;
}
}
let scale_lut = |plane: usize, index: i32| -> i32 {
let sh = bd - 8;
let x = index >> sh;
let rem = index - (x << sh);
if bd == 8 || x == 255 {
lut[plane][x as usize]
} else {
let start = lut[plane][x as usize];
let end = lut[plane][x as usize + 1];
start + round2((end - start) * rem, sh)
}
};
// Noise stripes (7.18.3.5).
let stripe_w = w + 64;
let n_stripes = (h.div_ceil(2)).div_ceil(16).max(1);
let mut stripes: Vec<[Vec<i32>; 3]> = (0..n_stripes).map(|_| [vec![0; 34 * stripe_w], vec![0; 34 * stripe_w], vec![0; 34 * stripe_w]]).collect();
let overlap = g.overlap_flag;
for (luma_num, stripe) in stripes.iter_mut().enumerate() {
let mut r = g.grain_seed;
r ^= (((luma_num * 37 + 178) & 255) << 8) as u32;
r ^= ((luma_num * 173 + 105) & 255) as u32;
rng.0 = r;
let mut x = 0;
while x < w.div_ceil(2) {
let rand = rng.next(8) as usize;
let off_x = rand >> 4;
let off_y = rand & 15;
for (plane, s) in stripe.iter_mut().enumerate().take(num_planes) {
let psx = if plane > 0 { sub_x } else { 0 };
let psy = if plane > 0 { sub_y } else { 0 };
let pox = if psx != 0 { 6 + off_x } else { 9 + off_x * 2 };
let poy = if psy != 0 { 6 + off_y } else { 9 + off_y * 2 };
let src = match plane {
0 => &luma,
1 => &cb,
_ => &cr,
};
for i in 0..(34 >> psy) {
for j in 0..(34 >> psx) {
let mut gv = src[poy + i][pox + j];
if psx == 0 {
let idx = i * stripe_w + x * 2 + j;
if j < 2 && overlap && x > 0 {
let old = s[idx];
gv = if j == 0 { old * 27 + gv * 17 } else { old * 17 + gv * 27 };
gv = round2(gv, 5).clamp(grain_min, grain_max);
}
s[idx] = gv;
} else {
let idx = i * stripe_w + x + j;
if j == 0 && overlap && x > 0 {
let old = s[idx];
gv = round2(old * 23 + gv * 22, 5).clamp(grain_min, grain_max);
}
s[idx] = gv;
}
}
}
}
x += 16;
}
}
let noise_at = |plane: usize, y: usize, x: usize| -> i32 {
let psy = if plane > 0 { sub_y } else { 0 };
let luma_num = y >> (5 - psy);
let i = y - (luma_num << (5 - psy));
let mut gv = stripes[luma_num][plane][i * stripe_w + x];
if psy == 0 {
if i < 2 && luma_num > 0 && overlap {
let old = stripes[luma_num - 1][plane][(i + 32) * stripe_w + x];
gv = if i == 0 { old * 27 + gv * 17 } else { old * 17 + gv * 27 };
gv = round2(gv, 5).clamp(grain_min, grain_max);
}
} else if i < 1 && luma_num > 0 && overlap {
let old = stripes[luma_num - 1][plane][(i + 16) * stripe_w + x];
gv = round2(old * 23 + gv * 22, 5).clamp(grain_min, grain_max);
}
gv
};
// Blend (7.18.3.5).
let (min_value, max_luma, max_chroma) = if g.clip_to_restricted_range {
let ml = 235 << (bd - 8);
(16 << (bd - 8), ml, if pic.matrix_coefficients as usize == MC_IDENTITY { ml } else { 240 << (bd - 8) })
} else {
let m = (256 << (bd - 8)) - 1;
(0, m, m)
};
let pix_max = (1i32 << bd) - 1;
let scaling_shift = g.grain_scaling_minus_8 + 8;
if !mono {
let cw = (w + sub_x) >> sub_x;
let ch = (h + sub_y) >> sub_y;
let [py, pu, pv] = &mut pic.planes;
for y in 0..ch {
for x in 0..cw {
let lx = x << sub_x;
let ly = y << sub_y;
let lnx = (lx + 1).min(w - 1);
let avg = if sub_x != 0 { round2(py[ly * w + lx] as i32 + py[ly * w + lnx] as i32, 1) } else { py[ly * w + lx] as i32 };
for (plane, out, on, luma_mult, mult, offset) in [
(1usize, &mut *pu, g.num_cb_points > 0, g.cb_luma_mult, g.cb_mult, g.cb_offset),
(2, &mut *pv, g.num_cr_points > 0, g.cr_luma_mult, g.cr_mult, g.cr_offset),
] {
if !(on || g.chroma_scaling_from_luma) {
continue;
}
let orig = out[y * cw + x] as i32;
let merged = if g.chroma_scaling_from_luma {
avg
} else {
let combined = avg * (luma_mult as i32 - 128) + orig * (mult as i32 - 128);
((combined >> 6) + ((offset as i32 - 256) << (bd - 8))).clamp(0, pix_max)
};
let noise = round2(scale_lut(plane, merged) * noise_at(plane, y, x), scaling_shift);
out[y * cw + x] = (orig + noise).clamp(min_value, max_chroma) as u16;
}
}
}
}
if g.num_y_points > 0 {
let py = &mut pic.planes[0];
for y in 0..h {
for x in 0..w {
let orig = py[y * w + x] as i32;
let noise = round2(scale_lut(0, orig) * noise_at(0, y, x), scaling_shift);
py[y * w + x] = (orig + noise).clamp(min_value, max_luma) as u16;
}
}
}
}