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avfilter: add convolution filter 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
tags/n3.0
Paul B Mahol 9 years ago
parent
b18467a943
commit
1c02af307a
6 changed files with 401 additions and 1 deletions
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  1. +1
    -0
      Changelog
  2. +62
    -0
      doc/filters.texi
  3. +1
    -0
      libavfilter/Makefile
  4. +1
    -0
      libavfilter/allfilters.c
  5. +1
    -1
      libavfilter/version.h
  6. +335
    -0
      libavfilter/vf_convolution.c

+ 1
- 0
Changelog View File

@@ -57,6 +57,7 @@ version <next>:
- only seek with the right mouse button in ffplay
- toggle full screen when double-clicking with the left mouse button in ffplay
- afftfilt filter
- convolution filter


version 2.8:


+ 62
- 0
doc/filters.texi View File

@@ -4662,6 +4662,68 @@ For example to convert from BT.601 to SMPTE-240M, use the command:
colormatrix=bt601:smpte240m
@end example

@section convolution

Apply convolution 3x3 or 5x5 filter.

The filter accepts the following options:

@table @option
@item 0m
@item 1m
@item 2m
@item 3m
Set matrix for each plane.
Matrix is sequence of 9 or 25 signed integers.

@item 0rdiv
@item 1rdiv
@item 2rdiv
@item 3rdiv
Set multiplier for calculated value for each plane.

@item 0bias
@item 1bias
@item 2bias
@item 3bias
Set bias for each plane. This value is added to the result of the multiplication.
Useful for making the overall image brighter or darker. Default is 0.0.
@end table

@subsection Examples

@itemize
@item
Apply sharpen:
@example
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"
@end example

@item
Apply blur:
@example
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"
@end example

@item
Apply edge enhance:
@example
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"
@end example

@item
Apply edge detect:
@example
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"
@end example

@item
Apply emboss:
@example
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"
@end example
@end itemize

@section copy

Copy the input source unchanged to the output. This is mainly useful for


+ 1
- 0
libavfilter/Makefile View File

@@ -123,6 +123,7 @@ OBJS-$(CONFIG_COLORCHANNELMIXER_FILTER) += vf_colorchannelmixer.o
OBJS-$(CONFIG_COLORKEY_FILTER) += vf_colorkey.o
OBJS-$(CONFIG_COLORLEVELS_FILTER) += vf_colorlevels.o
OBJS-$(CONFIG_COLORMATRIX_FILTER) += vf_colormatrix.o
OBJS-$(CONFIG_CONVOLUTION_FILTER) += vf_convolution.o
OBJS-$(CONFIG_COPY_FILTER) += vf_copy.o
OBJS-$(CONFIG_COVER_RECT_FILTER) += vf_cover_rect.o lavfutils.o
OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o


+ 1
- 0
libavfilter/allfilters.c View File

@@ -144,6 +144,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(COLORKEY, colorkey, vf);
REGISTER_FILTER(COLORLEVELS, colorlevels, vf);
REGISTER_FILTER(COLORMATRIX, colormatrix, vf);
REGISTER_FILTER(CONVOLUTION, convolution, vf);
REGISTER_FILTER(COPY, copy, vf);
REGISTER_FILTER(COVER_RECT, cover_rect, vf);
REGISTER_FILTER(CROP, crop, vf);


+ 1
- 1
libavfilter/version.h View File

@@ -30,7 +30,7 @@
#include "libavutil/version.h"

#define LIBAVFILTER_VERSION_MAJOR 6
#define LIBAVFILTER_VERSION_MINOR 26
#define LIBAVFILTER_VERSION_MINOR 27
#define LIBAVFILTER_VERSION_MICRO 100

#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \


+ 335
- 0
libavfilter/vf_convolution.c View File

@@ -0,0 +1,335 @@
/*
* Copyright (c) 2012-2013 Oka Motofumi (chikuzen.mo at gmail dot com)
* Copyright (c) 2015 Paul B Mahol
*
* 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 "libavutil/avstring.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

typedef struct ConvolutionContext {
const AVClass *class;

char *matrix_str[4];
float rdiv[4];
float bias[4];

int bstride;
uint8_t *buffer;
int nb_planes;
int planewidth[4];
int planeheight[4];
int matrix[4][25];
int matrix_length[4];
int copy[4];

void (*filter[4])(struct ConvolutionContext *s, AVFrame *in, AVFrame *out, int plane);
} ConvolutionContext;

#define OFFSET(x) offsetof(ConvolutionContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

static const AVOption convolution_options[] = {
{ "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 },
{ "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 },
{ "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 },
{ "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 },
{ "0rdiv", "set rdiv for 1st plane", OFFSET(rdiv[0]), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, 0.0, INT_MAX, FLAGS},
{ "1rdiv", "set rdiv for 2nd plane", OFFSET(rdiv[1]), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, 0.0, INT_MAX, FLAGS},
{ "2rdiv", "set rdiv for 3rd plane", OFFSET(rdiv[2]), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, 0.0, INT_MAX, FLAGS},
{ "3rdiv", "set rdiv for 4th plane", OFFSET(rdiv[3]), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, 0.0, INT_MAX, FLAGS},
{ "0bias", "set bias for 1st plane", OFFSET(bias[0]), AV_OPT_TYPE_FLOAT, {.dbl=0.0}, 0.0, INT_MAX, FLAGS},
{ "1bias", "set bias for 2nd plane", OFFSET(bias[1]), AV_OPT_TYPE_FLOAT, {.dbl=0.0}, 0.0, INT_MAX, FLAGS},
{ "2bias", "set bias for 3rd plane", OFFSET(bias[2]), AV_OPT_TYPE_FLOAT, {.dbl=0.0}, 0.0, INT_MAX, FLAGS},
{ "3bias", "set bias for 4th plane", OFFSET(bias[3]), AV_OPT_TYPE_FLOAT, {.dbl=0.0}, 0.0, INT_MAX, FLAGS},
{ NULL }
};

AVFILTER_DEFINE_CLASS(convolution);

static const int same3x3[9] = {0, 0, 0,
0, 1, 0,
0, 0, 0};

static const int same5x5[25] = {0, 0, 0, 0, 0,
0, 0, 0, 0, 0,
0, 0, 1, 0, 0,
0, 0, 0, 0, 0,
0, 0, 0, 0, 0};

static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_NONE
};

return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
}

static int config_input(AVFilterLink *inlink)
{
ConvolutionContext *s = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int ret;

if ((ret = av_image_fill_linesizes(s->planewidth, inlink->format, inlink->w)) < 0)
return ret;

s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
s->planeheight[0] = s->planeheight[3] = inlink->h;

s->nb_planes = av_pix_fmt_count_planes(inlink->format);

s->bstride = s->planewidth[0] + 32;
s->buffer = av_malloc(5 * s->bstride);
if (!s->buffer)
return AVERROR(ENOMEM);

return 0;
}

static inline void line_copy8(uint8_t *line, const uint8_t *srcp, int width, int mergin)
{
int i;

memcpy(line, srcp, width);

for (i = mergin; i > 0; i--) {
line[-i] = line[i];
line[width - 1 + i] = line[width - 1 - i];
}
}

static void filter_3x3(ConvolutionContext *s, AVFrame *in, AVFrame *out, int plane)
{
const uint8_t *src = in->data[plane];
uint8_t *dst = out->data[plane];
const int stride = in->linesize[plane];
const int bstride = s->bstride;
const int height = s->planeheight[plane];
const int width = s->planewidth[plane];
uint8_t *p0 = s->buffer + 16;
uint8_t *p1 = p0 + bstride;
uint8_t *p2 = p1 + bstride;
uint8_t *orig = p0, *end = p2;
const int *matrix = s->matrix[plane];
const float rdiv = s->rdiv[plane];
const float bias = s->bias[plane];
int y, x;

line_copy8(p0, src + stride, width, 1);
line_copy8(p1, src, width, 1);

for (y = 0; y < height; y++) {
src += stride * (y < height - 1 ? 1 : -1);
line_copy8(p2, src, width, 1);

for (x = 0; x < width; x++) {
int sum = p0[x - 1] * matrix[0] +
p0[x] * matrix[1] +
p0[x + 1] * matrix[2] +
p1[x - 1] * matrix[3] +
p1[x] * matrix[4] +
p1[x + 1] * matrix[5] +
p2[x - 1] * matrix[6] +
p2[x] * matrix[7] +
p2[x + 1] * matrix[8];
sum = (int)(sum * rdiv + bias + 0.5f);
dst[x] = av_clip(sum, 0, 255);
}

p0 = p1;
p1 = p2;
p2 = (p2 == end) ? orig: p2 + bstride;
dst += out->linesize[plane];
}
}

static void filter_5x5(ConvolutionContext *s, AVFrame *in, AVFrame *out, int plane)
{
const uint8_t *src = in->data[plane];
uint8_t *dst = out->data[plane];
const int stride = in->linesize[plane];
const int bstride = s->bstride;
const int height = s->planeheight[plane];
const int width = s->planewidth[plane];
uint8_t *p0 = s->buffer + 16;
uint8_t *p1 = p0 + bstride;
uint8_t *p2 = p1 + bstride;
uint8_t *p3 = p2 + bstride;
uint8_t *p4 = p3 + bstride;
uint8_t *orig = p0, *end = p4;
const int *matrix = s->matrix[plane];
float rdiv = s->rdiv[plane];
float bias = s->bias[plane];
int y, x, i;

line_copy8(p0, src + 2 * stride, width, 2);
line_copy8(p1, src + stride, width, 2);
line_copy8(p2, src, width, 2);
src += stride;
line_copy8(p3, src, width, 2);


for (y = 0; y < height; y++) {
uint8_t *array[] = {
p0 - 2, p0 - 1, p0, p0 + 1, p0 + 2,
p1 - 2, p1 - 1, p1, p1 + 1, p1 + 2,
p2 - 2, p2 - 1, p2, p2 + 1, p2 + 2,
p3 - 2, p3 - 1, p3, p3 + 1, p3 + 2,
p4 - 2, p4 - 1, p4, p4 + 1, p4 + 2
};

src += stride * (y < height - 2 ? 1 : -1);
line_copy8(p4, src, width, 2);

for (x = 0; x < width; x++) {
int sum = 0;

for (i = 0; i < 25; i++) {
sum += *(array[i] + x) * matrix[i];
}
sum = (int)(sum * rdiv + bias + 0.5f);
dst[x] = av_clip(sum, 0, 255);
}

p0 = p1;
p1 = p2;
p2 = p3;
p3 = p4;
p4 = (p4 == end) ? orig: p4 + bstride;
dst += out->linesize[plane];
}
}

static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
ConvolutionContext *s = inlink->dst->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFrame *out;
int plane;

out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);

for (plane = 0; plane < s->nb_planes; plane++) {
if (s->copy[plane]) {
av_image_copy_plane(out->data[plane], out->linesize[plane],
in->data[plane], in->linesize[plane],
s->planewidth[plane],
s->planeheight[plane]);
continue;
}

s->filter[plane](s, in, out, plane);
}

av_frame_free(&in);
return ff_filter_frame(outlink, out);
}

static av_cold int init(AVFilterContext *ctx)
{
ConvolutionContext *s = ctx->priv;
int i;

for (i = 0; i < 4; i++) {
int *matrix = (int *)s->matrix[i];
char *p, *arg, *saveptr = NULL;

p = s->matrix_str[i];
while (s->matrix_length[i] < 25) {
if (!(arg = av_strtok(p, " ", &saveptr)))
break;

p = NULL;
sscanf(arg, "%d", &matrix[s->matrix_length[i]]);
s->matrix_length[i]++;
}

if (s->matrix_length[i] == 9) {
if (!memcmp(matrix, same3x3, sizeof(same3x3)))
s->copy[i] = 1;
else
s->filter[i] = filter_3x3;
} else if (s->matrix_length[i] == 25) {
if (!memcmp(matrix, same5x5, sizeof(same5x5)))
s->copy[i] = 1;
else
s->filter[i] = filter_5x5;
} else {
return AVERROR(EINVAL);
}
}

return 0;
}

static av_cold void uninit(AVFilterContext *ctx)
{
ConvolutionContext *s = ctx->priv;

av_freep(&s->buffer);
}

static const AVFilterPad convolution_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
};

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,
};

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