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avfilter: add convolution filter
Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol
parent
b18467a943
commit
1c02af307a
@ -57,6 +57,7 @@ version <next>:
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- only seek with the right mouse button in ffplay
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- toggle full screen when double-clicking with the left mouse button in ffplay
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- afftfilt filter
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- convolution filter
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version 2.8:
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@ -4662,6 +4662,68 @@ For example to convert from BT.601 to SMPTE-240M, use the command:
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colormatrix=bt601:smpte240m
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@end example
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@section convolution
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Apply convolution 3x3 or 5x5 filter.
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The filter accepts the following options:
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@table @option
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@item 0m
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@item 1m
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@item 2m
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@item 3m
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Set matrix for each plane.
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Matrix is sequence of 9 or 25 signed integers.
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@item 0rdiv
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@item 1rdiv
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@item 2rdiv
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@item 3rdiv
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Set multiplier for calculated value for each plane.
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@item 0bias
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@item 1bias
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@item 2bias
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@item 3bias
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Set bias for each plane. This value is added to the result of the multiplication.
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Useful for making the overall image brighter or darker. Default is 0.0.
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@end table
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@subsection Examples
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@itemize
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@item
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Apply sharpen:
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@example
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convolution="0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0"
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@end example
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@item
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Apply blur:
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@example
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convolution="1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1 1 1 1 1 1 1 1 1:1/9:1/9:1/9:1/9"
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@end example
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@item
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Apply edge enhance:
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@example
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convolution="0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:0 0 0 -1 1 0 0 0 0:5:1:1:1:0:128:128:128"
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@end example
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@item
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Apply edge detect:
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@example
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convolution="0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:0 1 0 1 -4 1 0 1 0:5:5:5:1:0:128:128:128"
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@end example
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@item
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Apply emboss:
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@example
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convolution="-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2:-2 -1 0 -1 1 1 0 1 2"
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@end example
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@end itemize
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@section copy
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Copy the input source unchanged to the output. This is mainly useful for
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@ -123,6 +123,7 @@ OBJS-$(CONFIG_COLORCHANNELMIXER_FILTER) += vf_colorchannelmixer.o
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OBJS-$(CONFIG_COLORKEY_FILTER) += vf_colorkey.o
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OBJS-$(CONFIG_COLORLEVELS_FILTER) += vf_colorlevels.o
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OBJS-$(CONFIG_COLORMATRIX_FILTER) += vf_colormatrix.o
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OBJS-$(CONFIG_CONVOLUTION_FILTER) += vf_convolution.o
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OBJS-$(CONFIG_COPY_FILTER) += vf_copy.o
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OBJS-$(CONFIG_COVER_RECT_FILTER) += vf_cover_rect.o lavfutils.o
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OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
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@ -144,6 +144,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER(COLORKEY, colorkey, vf);
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REGISTER_FILTER(COLORLEVELS, colorlevels, vf);
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REGISTER_FILTER(COLORMATRIX, colormatrix, vf);
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REGISTER_FILTER(CONVOLUTION, convolution, vf);
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REGISTER_FILTER(COPY, copy, vf);
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REGISTER_FILTER(COVER_RECT, cover_rect, vf);
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REGISTER_FILTER(CROP, crop, vf);
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@ -30,7 +30,7 @@
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#include "libavutil/version.h"
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#define LIBAVFILTER_VERSION_MAJOR 6
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#define LIBAVFILTER_VERSION_MINOR 26
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#define LIBAVFILTER_VERSION_MINOR 27
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#define LIBAVFILTER_VERSION_MICRO 100
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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335
libavfilter/vf_convolution.c
Normal file
335
libavfilter/vf_convolution.c
Normal file
@ -0,0 +1,335 @@
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/*
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* Copyright (c) 2012-2013 Oka Motofumi (chikuzen.mo at gmail dot com)
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* Copyright (c) 2015 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct ConvolutionContext {
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const AVClass *class;
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char *matrix_str[4];
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float rdiv[4];
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float bias[4];
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int bstride;
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uint8_t *buffer;
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int nb_planes;
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int planewidth[4];
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int planeheight[4];
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int matrix[4][25];
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int matrix_length[4];
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int copy[4];
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void (*filter[4])(struct ConvolutionContext *s, AVFrame *in, AVFrame *out, int plane);
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} ConvolutionContext;
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#define OFFSET(x) offsetof(ConvolutionContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption convolution_options[] = {
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{ "0m", "set matrix for 1st plane", OFFSET(matrix_str[0]), AV_OPT_TYPE_STRING, {.str="0 0 0 0 1 0 0 0 0"}, 0, 0, FLAGS },
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{ "1m", "set matrix for 2nd plane", OFFSET(matrix_str[1]), AV_OPT_TYPE_STRING, {.str="0 0 0 0 1 0 0 0 0"}, 0, 0, FLAGS },
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{ "2m", "set matrix for 3rd plane", OFFSET(matrix_str[2]), AV_OPT_TYPE_STRING, {.str="0 0 0 0 1 0 0 0 0"}, 0, 0, FLAGS },
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{ "3m", "set matrix for 4th plane", OFFSET(matrix_str[3]), AV_OPT_TYPE_STRING, {.str="0 0 0 0 1 0 0 0 0"}, 0, 0, FLAGS },
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{ "0rdiv", "set rdiv for 1st plane", OFFSET(rdiv[0]), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, 0.0, INT_MAX, FLAGS},
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{ "1rdiv", "set rdiv for 2nd plane", OFFSET(rdiv[1]), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, 0.0, INT_MAX, FLAGS},
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{ "2rdiv", "set rdiv for 3rd plane", OFFSET(rdiv[2]), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, 0.0, INT_MAX, FLAGS},
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{ "3rdiv", "set rdiv for 4th plane", OFFSET(rdiv[3]), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, 0.0, INT_MAX, FLAGS},
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{ "0bias", "set bias for 1st plane", OFFSET(bias[0]), AV_OPT_TYPE_FLOAT, {.dbl=0.0}, 0.0, INT_MAX, FLAGS},
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{ "1bias", "set bias for 2nd plane", OFFSET(bias[1]), AV_OPT_TYPE_FLOAT, {.dbl=0.0}, 0.0, INT_MAX, FLAGS},
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{ "2bias", "set bias for 3rd plane", OFFSET(bias[2]), AV_OPT_TYPE_FLOAT, {.dbl=0.0}, 0.0, INT_MAX, FLAGS},
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{ "3bias", "set bias for 4th plane", OFFSET(bias[3]), AV_OPT_TYPE_FLOAT, {.dbl=0.0}, 0.0, INT_MAX, FLAGS},
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(convolution);
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static const int same3x3[9] = {0, 0, 0,
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0, 1, 0,
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0, 0, 0};
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static const int same5x5[25] = {0, 0, 0, 0, 0,
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0, 0, 0, 0, 0,
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0, 0, 1, 0, 0,
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0, 0, 0, 0, 0,
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0, 0, 0, 0, 0};
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
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AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_NONE
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};
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return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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}
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static int config_input(AVFilterLink *inlink)
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{
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ConvolutionContext *s = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int ret;
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if ((ret = av_image_fill_linesizes(s->planewidth, inlink->format, inlink->w)) < 0)
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return ret;
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s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
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s->planeheight[0] = s->planeheight[3] = inlink->h;
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s->nb_planes = av_pix_fmt_count_planes(inlink->format);
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s->bstride = s->planewidth[0] + 32;
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s->buffer = av_malloc(5 * s->bstride);
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if (!s->buffer)
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return AVERROR(ENOMEM);
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return 0;
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}
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static inline void line_copy8(uint8_t *line, const uint8_t *srcp, int width, int mergin)
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{
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int i;
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memcpy(line, srcp, width);
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for (i = mergin; i > 0; i--) {
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line[-i] = line[i];
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line[width - 1 + i] = line[width - 1 - i];
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}
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}
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static void filter_3x3(ConvolutionContext *s, AVFrame *in, AVFrame *out, int plane)
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{
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const uint8_t *src = in->data[plane];
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uint8_t *dst = out->data[plane];
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const int stride = in->linesize[plane];
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const int bstride = s->bstride;
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const int height = s->planeheight[plane];
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const int width = s->planewidth[plane];
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uint8_t *p0 = s->buffer + 16;
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uint8_t *p1 = p0 + bstride;
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uint8_t *p2 = p1 + bstride;
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uint8_t *orig = p0, *end = p2;
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const int *matrix = s->matrix[plane];
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const float rdiv = s->rdiv[plane];
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const float bias = s->bias[plane];
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int y, x;
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line_copy8(p0, src + stride, width, 1);
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line_copy8(p1, src, width, 1);
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for (y = 0; y < height; y++) {
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src += stride * (y < height - 1 ? 1 : -1);
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line_copy8(p2, src, width, 1);
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for (x = 0; x < width; x++) {
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int sum = p0[x - 1] * matrix[0] +
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p0[x] * matrix[1] +
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p0[x + 1] * matrix[2] +
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p1[x - 1] * matrix[3] +
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p1[x] * matrix[4] +
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p1[x + 1] * matrix[5] +
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p2[x - 1] * matrix[6] +
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p2[x] * matrix[7] +
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p2[x + 1] * matrix[8];
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sum = (int)(sum * rdiv + bias + 0.5f);
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dst[x] = av_clip(sum, 0, 255);
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}
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p0 = p1;
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p1 = p2;
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p2 = (p2 == end) ? orig: p2 + bstride;
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dst += out->linesize[plane];
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}
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}
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static void filter_5x5(ConvolutionContext *s, AVFrame *in, AVFrame *out, int plane)
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{
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const uint8_t *src = in->data[plane];
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uint8_t *dst = out->data[plane];
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const int stride = in->linesize[plane];
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const int bstride = s->bstride;
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const int height = s->planeheight[plane];
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const int width = s->planewidth[plane];
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uint8_t *p0 = s->buffer + 16;
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uint8_t *p1 = p0 + bstride;
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uint8_t *p2 = p1 + bstride;
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uint8_t *p3 = p2 + bstride;
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uint8_t *p4 = p3 + bstride;
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uint8_t *orig = p0, *end = p4;
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const int *matrix = s->matrix[plane];
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float rdiv = s->rdiv[plane];
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float bias = s->bias[plane];
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int y, x, i;
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line_copy8(p0, src + 2 * stride, width, 2);
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line_copy8(p1, src + stride, width, 2);
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line_copy8(p2, src, width, 2);
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src += stride;
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line_copy8(p3, src, width, 2);
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for (y = 0; y < height; y++) {
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uint8_t *array[] = {
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p0 - 2, p0 - 1, p0, p0 + 1, p0 + 2,
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p1 - 2, p1 - 1, p1, p1 + 1, p1 + 2,
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p2 - 2, p2 - 1, p2, p2 + 1, p2 + 2,
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p3 - 2, p3 - 1, p3, p3 + 1, p3 + 2,
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p4 - 2, p4 - 1, p4, p4 + 1, p4 + 2
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};
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src += stride * (y < height - 2 ? 1 : -1);
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line_copy8(p4, src, width, 2);
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for (x = 0; x < width; x++) {
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int sum = 0;
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for (i = 0; i < 25; i++) {
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sum += *(array[i] + x) * matrix[i];
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}
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sum = (int)(sum * rdiv + bias + 0.5f);
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dst[x] = av_clip(sum, 0, 255);
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}
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p0 = p1;
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p1 = p2;
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p2 = p3;
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p3 = p4;
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p4 = (p4 == end) ? orig: p4 + bstride;
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dst += out->linesize[plane];
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}
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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ConvolutionContext *s = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFrame *out;
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int plane;
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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for (plane = 0; plane < s->nb_planes; plane++) {
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if (s->copy[plane]) {
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av_image_copy_plane(out->data[plane], out->linesize[plane],
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in->data[plane], in->linesize[plane],
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s->planewidth[plane],
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s->planeheight[plane]);
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continue;
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}
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s->filter[plane](s, in, out, plane);
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}
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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ConvolutionContext *s = ctx->priv;
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int i;
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for (i = 0; i < 4; i++) {
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int *matrix = (int *)s->matrix[i];
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char *p, *arg, *saveptr = NULL;
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p = s->matrix_str[i];
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while (s->matrix_length[i] < 25) {
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if (!(arg = av_strtok(p, " ", &saveptr)))
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break;
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p = NULL;
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sscanf(arg, "%d", &matrix[s->matrix_length[i]]);
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s->matrix_length[i]++;
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}
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if (s->matrix_length[i] == 9) {
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if (!memcmp(matrix, same3x3, sizeof(same3x3)))
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s->copy[i] = 1;
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else
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s->filter[i] = filter_3x3;
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} else if (s->matrix_length[i] == 25) {
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if (!memcmp(matrix, same5x5, sizeof(same5x5)))
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s->copy[i] = 1;
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else
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s->filter[i] = filter_5x5;
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} else {
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return AVERROR(EINVAL);
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}
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}
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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ConvolutionContext *s = ctx->priv;
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av_freep(&s->buffer);
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}
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static const AVFilterPad convolution_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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|
||||
static const AVFilterPad convolution_outputs[] = {
|
||||
{
|
||||
.name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
},
|
||||
{ NULL }
|
||||
};
|
||||
|
||||
AVFilter ff_vf_convolution = {
|
||||
.name = "convolution",
|
||||
.description = NULL_IF_CONFIG_SMALL("Apply convolution filter."),
|
||||
.priv_size = sizeof(ConvolutionContext),
|
||||
.priv_class = &convolution_class,
|
||||
.init = init,
|
||||
.uninit = uninit,
|
||||
.query_formats = query_formats,
|
||||
.inputs = convolution_inputs,
|
||||
.outputs = convolution_outputs,
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user