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lavfi: Add OpenCL avgblur filter

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Behaves like the existing avgblur filter, except working on OpenCL
hardware frames. Takes exactly the same options.

Signed-off-by: Mark Thompson <sw@jkqxz.net>
This commit is contained in:
drfer3 2018-03-19 13:30:23 +11:00 • committed by Mark Thompson
parent 9313422dfc
commit 6135c958cd
6 changed files with 393 additions and 0 deletions
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60
libavfilter/opencl/avgblur.cl Normal file
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/*
* Copyright (c) 2018 Dylan Fernando
*
* 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
*/
__kernel void avgblur_horiz(__write_only image2d_t dst,
__read_only image2d_t src,
int rad)
{
const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
CLK_FILTER_NEAREST);
int2 loc = (int2)(get_global_id(0), get_global_id(1));
int2 size = (int2)(get_global_size(0), get_global_size(1));
int count = 0;
float4 acc = (float4)(0,0,0,0);
for (int xx = max(0, loc.x - rad); xx < min(loc.x + rad + 1, size.x); xx++) {
count++;
acc += read_imagef(src, sampler, (int2)(xx, loc.y));
}
write_imagef(dst, loc, acc / count);
}
__kernel void avgblur_vert(__write_only image2d_t dst,
__read_only image2d_t src,
int radv)
{
const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
CLK_FILTER_NEAREST);
int2 loc = (int2)(get_global_id(0), get_global_id(1));
int2 size = (int2)(get_global_size(0), get_global_size(1));
int count = 0;
float4 acc = (float4)(0,0,0,0);
for (int yy = max(0, loc.y - radv); yy < min(loc.y + radv + 1, size.y); yy++) {
count++;
acc += read_imagef(src, sampler, (int2)(loc.x, yy));
}
write_imagef(dst, loc, acc / count);
}