rav1d-safe 0.5.3

Safe SIMD fork of rav1d - Rust AV1 decoder with archmage intrinsics
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212

#![forbid(unsafe_code)]
use crate::include::common::intops::apply_sign;
use crate::include::common::intops::apply_sign64;
use crate::include::common::intops::iclip;
use crate::include::common::intops::u64log2;
use crate::include::common::intops::ulog2;
use crate::include::dav1d::headers::Rav1dWarpedMotionParams;
use crate::src::levels::Mv;
use std::ffi::c_int;

static div_lut: [u16; 257] = [
    16384, 16320, 16257, 16194, 16132, 16070, 16009, 15948, 15888, 15828, 15768, 15709, 15650,
    15592, 15534, 15477, 15420, 15364, 15308, 15252, 15197, 15142, 15087, 15033, 14980, 14926,
    14873, 14821, 14769, 14717, 14665, 14614, 14564, 14513, 14463, 14413, 14364, 14315, 14266,
    14218, 14170, 14122, 14075, 14028, 13981, 13935, 13888, 13843, 13797, 13752, 13707, 13662,
    13618, 13574, 13530, 13487, 13443, 13400, 13358, 13315, 13273, 13231, 13190, 13148, 13107,
    13066, 13026, 12985, 12945, 12906, 12866, 12827, 12788, 12749, 12710, 12672, 12633, 12596,
    12558, 12520, 12483, 12446, 12409, 12373, 12336, 12300, 12264, 12228, 12193, 12157, 12122,
    12087, 12053, 12018, 11984, 11950, 11916, 11882, 11848, 11815, 11782, 11749, 11716, 11683,
    11651, 11619, 11586, 11555, 11523, 11491, 11460, 11429, 11398, 11367, 11336, 11305, 11275,
    11245, 11215, 11185, 11155, 11125, 11096, 11067, 11038, 11009, 10980, 10951, 10923, 10894,
    10866, 10838, 10810, 10782, 10755, 10727, 10700, 10673, 10645, 10618, 10592, 10565, 10538,
    10512, 10486, 10460, 10434, 10408, 10382, 10356, 10331, 10305, 10280, 10255, 10230, 10205,
    10180, 10156, 10131, 10107, 10082, 10058, 10034, 10010, 9986, 9963, 9939, 9916, 9892, 9869,
    9846, 9823, 9800, 9777, 9754, 9732, 9709, 9687, 9664, 9642, 9620, 9598, 9576, 9554, 9533, 9511,
    9489, 9468, 9447, 9425, 9404, 9383, 9362, 9341, 9321, 9300, 9279, 9259, 9239, 9218, 9198, 9178,
    9158, 9138, 9118, 9098, 9079, 9059, 9039, 9020, 9001, 8981, 8962, 8943, 8924, 8905, 8886, 8867,
    8849, 8830, 8812, 8793, 8775, 8756, 8738, 8720, 8702, 8684, 8666, 8648, 8630, 8613, 8595, 8577,
    8560, 8542, 8525, 8508, 8490, 8473, 8456, 8439, 8422, 8405, 8389, 8372, 8355, 8339, 8322, 8306,
    8289, 8273, 8257, 8240, 8224, 8208, 8192,
];

#[inline]
fn iclip_wmp(v: c_int) -> c_int {
    let cv = iclip(v, i16::MIN.into(), i16::MAX.into());
    apply_sign(cv.abs() + 32 >> 6, cv) * (1 << 6)
}

#[inline]
fn resolve_divisor_32(d: u32) -> (c_int, c_int) {
    let shift = ulog2(d);
    let e = d - (1 << shift);
    let f = if shift > 8 {
        e + (1 << shift - 9) >> shift - 8
    } else {
        e << 8 - shift
    };
    // Use f as lookup into the precomputed table of multipliers
    (shift + 14, div_lut[f as usize] as c_int)
}

pub(crate) fn rav1d_get_shear_params(wm: &Rav1dWarpedMotionParams) -> bool {
    let mat = &wm.matrix;

    if mat[2] <= 0 {
        return true;
    }

    let alpha = iclip_wmp(mat[2] - 0x10000) as i16;
    let beta = iclip_wmp(mat[3]) as i16;

    let (shift, y) = resolve_divisor_32((mat[2]).abs() as u32);
    let y = apply_sign(y, mat[2]);
    let v1 = mat[4] as i64 * 0x10000 * y as i64;
    let rnd = 1 << shift >> 1;
    let gamma = iclip_wmp(apply_sign64((v1.abs() + rnd as i64 >> shift) as c_int, v1)) as i16;
    let v2 = mat[3] as i64 * mat[4] as i64 * y as i64;
    let delta =
        iclip_wmp(mat[5] - apply_sign64((v2.abs() + rnd as i64 >> shift) as c_int, v2) - 0x10000)
            as i16;
    wm.abcd.set([alpha, beta, gamma, delta]);

    4 * (alpha as i32).abs() + 7 * (beta as i32).abs() >= 0x10000
        || 4 * (gamma as i32).abs() + 4 * (delta as i32).abs() >= 0x10000
}

fn resolve_divisor_64(d: u64) -> (c_int, c_int) {
    let shift = u64log2(d);
    let e = d - (1 << shift);
    let f = if shift > 8 {
        e + (1 << shift - 9) >> shift - 8
    } else {
        e << 8 - shift
    };
    // Use f as lookup into the precomputed table of multipliers
    (shift + 14, div_lut[f as usize] as c_int)
}

fn get_mult_shift_ndiag(px: i64, idet: c_int, shift: c_int) -> c_int {
    let v1 = px * idet as i64;
    let v2 = apply_sign64((v1.abs() + (1 << shift >> 1) >> shift) as c_int, v1);
    iclip(v2, -0x1fff, 0x1fff)
}

fn get_mult_shift_diag(px: i64, idet: c_int, shift: c_int) -> c_int {
    let v1 = px * idet as i64;
    let v2 = apply_sign64((v1.abs() + (1 << shift >> 1) >> shift) as c_int, v1);
    iclip(v2, 0xe001, 0x11fff)
}

pub(crate) fn rav1d_set_affine_mv2d(
    bw4: c_int,
    bh4: c_int,
    mv: Mv,
    wm: &mut Rav1dWarpedMotionParams,
    bx4: c_int,
    by4: c_int,
) {
    let mat = &mut wm.matrix;
    let rsuy = 2 * bh4 - 1;
    let rsux = 2 * bw4 - 1;
    let isuy = by4 * 4 + rsuy;
    let isux = bx4 * 4 + rsux;

    mat[0] = iclip(
        mv.x as i32 * 0x2000 - (isux * (mat[2] - 0x10000) + isuy * mat[3]),
        -0x800000,
        0x7fffff,
    );
    mat[1] = iclip(
        mv.y as i32 * 0x2000 - (isux * mat[4] + isuy * (mat[5] - 0x10000)),
        -0x800000,
        0x7fffff,
    );
}

pub(crate) fn rav1d_find_affine_int(
    pts: &[[[c_int; 2]; 2]; 8],
    np: usize,
    bw4: c_int,
    bh4: c_int,
    mv: Mv,
    wm: &mut Rav1dWarpedMotionParams,
    bx4: c_int,
    by4: c_int,
) -> bool {
    let mat = &mut wm.matrix;
    let mut a = [[0, 0], [0, 0]];
    let mut bx = [0, 0];
    let mut by = [0, 0];
    let rsuy = 2 * bh4 - 1;
    let rsux = 2 * bw4 - 1;
    let suy = rsuy * 8;
    let sux = rsux * 8;
    let duy = suy + mv.y as c_int;
    let dux = sux + mv.x as c_int;
    let isuy = by4 * 4 + rsuy;
    let isux = bx4 * 4 + rsux;

    for pts in &pts[..np] {
        let dx = pts[1][0] - dux;
        let dy = pts[1][1] - duy;
        let sx = pts[0][0] - sux;
        let sy = pts[0][1] - suy;
        if (sx - dx).abs() < 256 && (sy - dy).abs() < 256 {
            a[0][0] += (sx * sx >> 2) + sx * 2 + 8;
            a[0][1] += (sx * sy >> 2) + sx + sy + 4;
            a[1][1] += (sy * sy >> 2) + sy * 2 + 8;
            bx[0] += (sx * dx >> 2) + sx + dx + 8;
            bx[1] += (sy * dx >> 2) + sy + dx + 4;
            by[0] += (sx * dy >> 2) + sx + dy + 4;
            by[1] += (sy * dy >> 2) + sy + dy + 8;
        }
    }

    // compute determinant of a
    let det = a[0][0] as i64 * a[1][1] as i64 - a[0][1] as i64 * a[0][1] as i64;
    if det == 0 {
        return true;
    }
    let (mut shift, idet) = resolve_divisor_64(det.abs() as u64);
    let mut idet = apply_sign64(idet, det);
    shift -= 16;
    if shift < 0 {
        idet <<= -shift;
        shift = 0;
    }

    // solve the least-squares
    mat[2] = get_mult_shift_diag(
        a[1][1] as i64 * bx[0] as i64 - a[0][1] as i64 * bx[1] as i64,
        idet,
        shift,
    );
    mat[3] = get_mult_shift_ndiag(
        a[0][0] as i64 * bx[1] as i64 - a[0][1] as i64 * bx[0] as i64,
        idet,
        shift,
    );
    mat[4] = get_mult_shift_ndiag(
        a[1][1] as i64 * by[0] as i64 - a[0][1] as i64 * by[1] as i64,
        idet,
        shift,
    );
    mat[5] = get_mult_shift_diag(
        a[0][0] as i64 * by[1] as i64 - a[0][1] as i64 * by[0] as i64,
        idet,
        shift,
    );
    mat[0] = iclip(
        mv.x as i32 * 0x2000 - (isux * (mat[2] - 0x10000) + isuy * mat[3]),
        -0x800000,
        0x7fffff,
    );
    mat[1] = iclip(
        mv.y as i32 * 0x2000 - (isux * mat[4] + isuy * (mat[5] - 0x10000)),
        -0x800000,
        0x7fffff,
    );

    false
}