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/*
* Copyright (C) 2018 Philip Langdale <philipl@overt.org>
* 2020 Aman Karmani <aman@tmm1.net>
* 2020 Stefan Dyulgerov <stefan.dyulgerov@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <metal_stdlib>
#include <metal_integer>
#include <metal_texture>
using namespace metal;
/*
* Version compat shims
*/
#if __METAL_VERSION__ < 210
#define max3(x, y, z) max(x, max(y, z))
#define min3(x, y, z) min(x, min(y, z))
#endif
/*
* Parameters
*/
struct deintParams {
uint channels;
uint parity;
uint tff;
bool is_second_field;
bool skip_spatial_check;
int field_mode;
};
/*
* Texture access helpers
*/
#define accesstype access::sample
constexpr sampler s(coord::pixel);
template <typename T>
T tex2D(texture2d<float, access::sample> tex, uint x, uint y)
{
return tex.sample(s, float2(x, y)).x;
}
template <>
float2 tex2D<float2>(texture2d<float, access::sample> tex, uint x, uint y)
{
return tex.sample(s, float2(x, y)).xy;
}
template <typename T>
T tex2D(texture2d<float, access::read> tex, uint x, uint y)
{
return tex.read(uint2(x, y)).x;
}
template <>
float2 tex2D<float2>(texture2d<float, access::read> tex, uint x, uint y)
{
return tex.read(uint2(x, y)).xy;
}
/*
* YADIF helpers
*/
template<typename T>
T spatial_predictor(T a, T b, T c, T d, T e, T f, T g,
T h, T i, T j, T k, T l, T m, T n)
{
T spatial_pred = (d + k)/2;
T spatial_score = abs(c - j) + abs(d - k) + abs(e - l);
T score = abs(b - k) + abs(c - l) + abs(d - m);
if (score < spatial_score) {
spatial_pred = (c + l)/2;
spatial_score = score;
score = abs(a - l) + abs(b - m) + abs(c - n);
if (score < spatial_score) {
spatial_pred = (b + m)/2;
spatial_score = score;
}
}
score = abs(d - i) + abs(e - j) + abs(f - k);
if (score < spatial_score) {
spatial_pred = (e + j)/2;
spatial_score = score;
score = abs(e - h) + abs(f - i) + abs(g - j);
if (score < spatial_score) {
spatial_pred = (f + i)/2;
spatial_score = score;
}
}
return spatial_pred;
}
template<typename T>
T temporal_predictor(T A, T B, T C, T D, T E, T F,
T G, T H, T I, T J, T K, T L,
T spatial_pred, bool skip_check)
{
T p0 = (C + H) / 2;
T p1 = F;
T p2 = (D + I) / 2;
T p3 = G;
T p4 = (E + J) / 2;
T tdiff0 = abs(D - I);
T tdiff1 = (abs(A - F) + abs(B - G)) / 2;
T tdiff2 = (abs(K - F) + abs(G - L)) / 2;
T diff = max3(tdiff0, tdiff1, tdiff2);
if (!skip_check) {
T maxi = max3(p2 - p3, p2 - p1, min(p0 - p1, p4 - p3));
T mini = min3(p2 - p3, p2 - p1, max(p0 - p1, p4 - p3));
diff = max3(diff, mini, -maxi);
}
return clamp(spatial_pred, p2 - diff, p2 + diff);
}
#define T float2
template <>
T spatial_predictor<T>(T a, T b, T c, T d, T e, T f, T g,
T h, T i, T j, T k, T l, T m, T n)
{
return T(
spatial_predictor(a.x, b.x, c.x, d.x, e.x, f.x, g.x,
h.x, i.x, j.x, k.x, l.x, m.x, n.x),
spatial_predictor(a.y, b.y, c.y, d.y, e.y, f.y, g.y,
h.y, i.y, j.y, k.y, l.y, m.y, n.y)
);
}
template <>
T temporal_predictor<T>(T A, T B, T C, T D, T E, T F,
T G, T H, T I, T J, T K, T L,
T spatial_pred, bool skip_check)
{
return T(
temporal_predictor(A.x, B.x, C.x, D.x, E.x, F.x,
G.x, H.x, I.x, J.x, K.x, L.x,
spatial_pred.x, skip_check),
temporal_predictor(A.y, B.y, C.y, D.y, E.y, F.y,
G.y, H.y, I.y, J.y, K.y, L.y,
spatial_pred.y, skip_check)
);
}
#undef T
/*
* YADIF compute
*/
template <typename T>
T yadif_compute_spatial(
texture2d<float, accesstype> cur,
uint2 pos)
{
// Calculate spatial prediction
T a = tex2D<T>(cur, pos.x - 3, pos.y - 1);
T b = tex2D<T>(cur, pos.x - 2, pos.y - 1);
T c = tex2D<T>(cur, pos.x - 1, pos.y - 1);
T d = tex2D<T>(cur, pos.x - 0, pos.y - 1);
T e = tex2D<T>(cur, pos.x + 1, pos.y - 1);
T f = tex2D<T>(cur, pos.x + 2, pos.y - 1);
T g = tex2D<T>(cur, pos.x + 3, pos.y - 1);
T h = tex2D<T>(cur, pos.x - 3, pos.y + 1);
T i = tex2D<T>(cur, pos.x - 2, pos.y + 1);
T j = tex2D<T>(cur, pos.x - 1, pos.y + 1);
T k = tex2D<T>(cur, pos.x - 0, pos.y + 1);
T l = tex2D<T>(cur, pos.x + 1, pos.y + 1);
T m = tex2D<T>(cur, pos.x + 2, pos.y + 1);
T n = tex2D<T>(cur, pos.x + 3, pos.y + 1);
return spatial_predictor(a, b, c, d, e, f, g,
h, i, j, k, l, m, n);
}
template <typename T>
T yadif_compute_temporal(
texture2d<float, accesstype> cur,
texture2d<float, accesstype> prev2,
texture2d<float, accesstype> prev1,
texture2d<float, accesstype> next1,
texture2d<float, accesstype> next2,
T spatial_pred,
bool skip_spatial_check,
uint2 pos)
{
// Calculate temporal prediction
T A = tex2D<T>(prev2, pos.x, pos.y - 1);
T B = tex2D<T>(prev2, pos.x, pos.y + 1);
T C = tex2D<T>(prev1, pos.x, pos.y - 2);
T D = tex2D<T>(prev1, pos.x, pos.y + 0);
T E = tex2D<T>(prev1, pos.x, pos.y + 2);
T F = tex2D<T>(cur, pos.x, pos.y - 1);
T G = tex2D<T>(cur, pos.x, pos.y + 1);
T H = tex2D<T>(next1, pos.x, pos.y - 2);
T I = tex2D<T>(next1, pos.x, pos.y + 0);
T J = tex2D<T>(next1, pos.x, pos.y + 2);
T K = tex2D<T>(next2, pos.x, pos.y - 1);
T L = tex2D<T>(next2, pos.x, pos.y + 1);
return temporal_predictor(A, B, C, D, E, F, G, H, I, J, K, L,
spatial_pred, skip_spatial_check);
}
template <typename T>
T yadif(
texture2d<float, access::write> dst,
texture2d<float, accesstype> prev,
texture2d<float, accesstype> cur,
texture2d<float, accesstype> next,
constant deintParams& params,
uint2 pos)
{
T spatial_pred = yadif_compute_spatial<T>(cur, pos);
if (params.is_second_field) {
return yadif_compute_temporal(cur, prev, cur, next, next, spatial_pred, params.skip_spatial_check, pos);
} else {
return yadif_compute_temporal(cur, prev, prev, cur, next, spatial_pred, params.skip_spatial_check, pos);
}
}
/*
* Kernel dispatch
*/
kernel void deint(
texture2d<float, access::write> dst [[texture(0)]],
texture2d<float, accesstype> prev [[texture(1)]],
texture2d<float, accesstype> cur [[texture(2)]],
texture2d<float, accesstype> next [[texture(3)]],
constant deintParams& params [[buffer(4)]],
uint2 pos [[thread_position_in_grid]])
{
if ((pos.x >= dst.get_width()) ||
(pos.y >= dst.get_height())) {
return;
}
// Don't modify the primary field
if (pos.y % 2 == params.parity) {
float4 in = cur.read(pos);
dst.write(in, pos);
return;
}
float2 pred;
if (params.channels == 1)
pred = float2(yadif<float>(dst, prev, cur, next, params, pos));
else
pred = yadif<float2>(dst, prev, cur, next, params, pos);
dst.write(pred.xyyy, pos);
}
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