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/*
* Copyright (C) 2013 Wei Gao <weigao@multicorewareinc.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
*/
#ifndef AVFILTER_DESHAKE_KERNEL_H
#define AVFILTER_DESHAKE_KERNEL_H
#include "libavutil/opencl.h"
const char *ff_kernel_deshake_opencl = AV_OPENCL_KERNEL(
inline unsigned char pixel(global const unsigned char *src, float x, float y,
int w, int h,int stride, unsigned char def)
{
return (x < 0 || y < 0 || x >= w || y >= h) ? def : src[(int)x + (int)y * stride];
}
unsigned char interpolate_nearest(float x, float y, global const unsigned char *src,
int width, int height, int stride, unsigned char def)
{
return pixel(src, (int)(x + 0.5), (int)(y + 0.5), width, height, stride, def);
}
unsigned char interpolate_bilinear(float x, float y, global const unsigned char *src,
int width, int height, int stride, unsigned char def)
{
int x_c, x_f, y_c, y_f;
int v1, v2, v3, v4;
if (x < -1 || x > width || y < -1 || y > height) {
return def;
} else {
x_f = (int)x;
x_c = x_f + 1;
y_f = (int)y;
y_c = y_f + 1;
v1 = pixel(src, x_c, y_c, width, height, stride, def);
v2 = pixel(src, x_c, y_f, width, height, stride, def);
v3 = pixel(src, x_f, y_c, width, height, stride, def);
v4 = pixel(src, x_f, y_f, width, height, stride, def);
return (v1*(x - x_f)*(y - y_f) + v2*((x - x_f)*(y_c - y)) +
v3*(x_c - x)*(y - y_f) + v4*((x_c - x)*(y_c - y)));
}
}
unsigned char interpolate_biquadratic(float x, float y, global const unsigned char *src,
int width, int height, int stride, unsigned char def)
{
int x_c, x_f, y_c, y_f;
unsigned char v1, v2, v3, v4;
float f1, f2, f3, f4;
if (x < - 1 || x > width || y < -1 || y > height)
return def;
else {
x_f = (int)x;
x_c = x_f + 1;
y_f = (int)y;
y_c = y_f + 1;
v1 = pixel(src, x_c, y_c, width, height, stride, def);
v2 = pixel(src, x_c, y_f, width, height, stride, def);
v3 = pixel(src, x_f, y_c, width, height, stride, def);
v4 = pixel(src, x_f, y_f, width, height, stride, def);
f1 = 1 - sqrt((x_c - x) * (y_c - y));
f2 = 1 - sqrt((x_c - x) * (y - y_f));
f3 = 1 - sqrt((x - x_f) * (y_c - y));
f4 = 1 - sqrt((x - x_f) * (y - y_f));
return (v1 * f1 + v2 * f2 + v3 * f3 + v4 * f4) / (f1 + f2 + f3 + f4);
}
}
inline const float clipf(float a, float amin, float amax)
{
if (a < amin) return amin;
else if (a > amax) return amax;
else return a;
}
inline int mirror(int v, int m)
{
while ((unsigned)v > (unsigned)m) {
v = -v;
if (v < 0)
v += 2 * m;
}
return v;
}
kernel void avfilter_transform(global unsigned char *src,
global unsigned char *dst,
global float *matrix,
global float *matrix2,
int interpolate,
int fillmethod,
int src_stride_lu,
int dst_stride_lu,
int src_stride_ch,
int dst_stride_ch,
int height,
int width,
int ch,
int cw)
{
int global_id = get_global_id(0);
global unsigned char *dst_y = dst;
global unsigned char *dst_u = dst_y + height * dst_stride_lu;
global unsigned char *dst_v = dst_u + ch * dst_stride_ch;
global unsigned char *src_y = src;
global unsigned char *src_u = src_y + height * src_stride_lu;
global unsigned char *src_v = src_u + ch * src_stride_ch;
global unsigned char *tempdst;
global unsigned char *tempsrc;
int x;
int y;
float x_s;
float y_s;
int tempsrc_stride;
int tempdst_stride;
int temp_height;
int temp_width;
int curpos;
unsigned char def = 0;
if (global_id < width*height) {
y = global_id/width;
x = global_id%width;
x_s = x * matrix[0] + y * matrix[1] + matrix[2];
y_s = x * matrix[3] + y * matrix[4] + matrix[5];
tempdst = dst_y;
tempsrc = src_y;
tempsrc_stride = src_stride_lu;
tempdst_stride = dst_stride_lu;
temp_height = height;
temp_width = width;
} else if ((global_id >= width*height)&&(global_id < width*height + ch*cw)) {
y = (global_id - width*height)/cw;
x = (global_id - width*height)%cw;
x_s = x * matrix2[0] + y * matrix2[1] + matrix2[2];
y_s = x * matrix2[3] + y * matrix2[4] + matrix2[5];
tempdst = dst_u;
tempsrc = src_u;
tempsrc_stride = src_stride_ch;
tempdst_stride = dst_stride_ch;
temp_height = height;
temp_width = width;
temp_height = ch;
temp_width = cw;
} else {
y = (global_id - width*height - ch*cw)/cw;
x = (global_id - width*height - ch*cw)%cw;
x_s = x * matrix2[0] + y * matrix2[1] + matrix2[2];
y_s = x * matrix2[3] + y * matrix2[4] + matrix2[5];
tempdst = dst_v;
tempsrc = src_v;
tempsrc_stride = src_stride_ch;
tempdst_stride = dst_stride_ch;
temp_height = ch;
temp_width = cw;
}
curpos = y * tempdst_stride + x;
switch (fillmethod) {
case 0: //FILL_BLANK
def = 0;
break;
case 1: //FILL_ORIGINAL
def = tempsrc[y*tempsrc_stride+x];
break;
case 2: //FILL_CLAMP
y_s = clipf(y_s, 0, temp_height - 1);
x_s = clipf(x_s, 0, temp_width - 1);
def = tempsrc[(int)y_s * tempsrc_stride + (int)x_s];
break;
case 3: //FILL_MIRROR
y_s = mirror(y_s,temp_height - 1);
x_s = mirror(x_s,temp_width - 1);
def = tempsrc[(int)y_s * tempsrc_stride + (int)x_s];
break;
}
switch (interpolate) {
case 0: //INTERPOLATE_NEAREST
tempdst[curpos] = interpolate_nearest(x_s, y_s, tempsrc, temp_width, temp_height, tempsrc_stride, def);
break;
case 1: //INTERPOLATE_BILINEAR
tempdst[curpos] = interpolate_bilinear(x_s, y_s, tempsrc, temp_width, temp_height, tempsrc_stride, def);
break;
case 2: //INTERPOLATE_BIQUADRATIC
tempdst[curpos] = interpolate_biquadratic(x_s, y_s, tempsrc, temp_width, temp_height, tempsrc_stride, def);
break;
default:
return;
}
}
);
#endif /* AVFILTER_DESHAKE_KERNEL_H */
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