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lavfi: add smartblur filter 

This is a port of the MPlayer smartblur filter (libmpcodecs/vf_smartblur.c)
by Michael Niedermayer.

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
tags/n1.0
Jérémy Tran Stefano Sabatini 13 years ago
parent
18217bb0f5
commit
316afee708
7 changed files with 339 additions and 2 deletions
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  1. +1
    -0
      Changelog
  2. +1
    -0
      configure
  3. +29
    -0
      doc/filters.texi
  4. +2
    -0
      libavfilter/Makefile
  5. +1
    -0
      libavfilter/allfilters.c
  6. +2
    -2
      libavfilter/version.h
  7. +303
    -0
      libavfilter/vf_smartblur.c

+ 1
- 0
Changelog View File

@@ -54,6 +54,7 @@ version next:
- Ut Video encoder
- Matroska demuxer now identifies SRT subtitles as AV_CODEC_ID_SUBRIP
instead of AV_CODEC_ID_TEXT
- smartblur filter ported from MPlayer


version 0.11:


+ 1
- 0
configure View File

@@ -1867,6 +1867,7 @@ ocv_filter_deps="libopencv"
pan_filter_deps="swresample"
removelogo_filter_deps="avcodec avformat swscale"
scale_filter_deps="swscale"
smartblur_filter_deps="gpl swscale"
select_filter_deps="avcodec"
showspectrum_filter_deps="avcodec"
super2xsai_filter_deps="gpl"


+ 29
- 0
doc/filters.texi View File

@@ -3253,6 +3253,35 @@ not specified it will use the default value of 16.
Adding this in the beginning of filter chains should make filtering
faster due to better use of the memory cache.

@section smartblur

Blur the input video without impacting the outlines.

The filter accepts the following parameters:
@var{luma_radius}:@var{luma_strength}:@var{luma_threshold}[:@var{chroma_radius}:@var{chroma_strength}:@var{chroma_threshold}]

Parameters prefixed by @var{luma} indicate that they work on the
luminance of the pixels whereas parameters prefixed by @var{chroma}
refer to the chrominance of the pixels.

If the chroma parameters are not set, the luma parameters are used for
either the luminance and the chrominance of the pixels.

@var{luma_radius} or @var{chroma_radius} must be a float number in the
range [0.1,5.0] that specifies the variance of the gaussian filter
used to blur the image (slower if larger).

@var{luma_strength} or @var{chroma_strength} must be a float number in
the range [-1.0,1.0] that configures the blurring. A value included in
[0.0,1.0] will blur the image whereas a value included in [-1.0,0.0]
will sharpen the image.

@var{luma_threshold} or @var{chroma_threshold} must be an integer in
the range [-30,30] that is used as a coefficient to determine whether
a pixel should be blurred or not. A value of 0 will filter all the
image, a value included in [0,30] will filter flat areas and a value
included in [-30,0] will filter edges.

@section split

Split input video into several identical outputs.


+ 2
- 0
libavfilter/Makefile View File

@@ -14,6 +14,7 @@ FFLIBS-$(CONFIG_MOVIE_FILTER) += avformat avcodec
FFLIBS-$(CONFIG_PAN_FILTER) += swresample
FFLIBS-$(CONFIG_REMOVELOGO_FILTER) += avformat avcodec
FFLIBS-$(CONFIG_MP_FILTER) += avcodec postproc
FFLIBS-$(CONFIG_SMARTBLUR_FILTER) += swscale

HEADERS = asrc_abuffer.h \
avcodec.h \
@@ -125,6 +126,7 @@ OBJS-$(CONFIG_SETSAR_FILTER) += vf_aspect.o
OBJS-$(CONFIG_SETTB_FILTER) += f_settb.o
OBJS-$(CONFIG_SHOWINFO_FILTER) += vf_showinfo.o
OBJS-$(CONFIG_SLICIFY_FILTER) += vf_slicify.o
OBJS-$(CONFIG_SMARTBLUR_FILTER) += vf_smartblur.o
OBJS-$(CONFIG_SPLIT_FILTER) += split.o
OBJS-$(CONFIG_SUPER2XSAI_FILTER) += vf_super2xsai.o
OBJS-$(CONFIG_SWAPUV_FILTER) += vf_swapuv.o


+ 1
- 0
libavfilter/allfilters.c View File

@@ -116,6 +116,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (SETTB, settb, vf);
REGISTER_FILTER (SHOWINFO, showinfo, vf);
REGISTER_FILTER (SLICIFY, slicify, vf);
REGISTER_FILTER (SMARTBLUR, smartblur, vf);
REGISTER_FILTER (SPLIT, split, vf);
REGISTER_FILTER (SUPER2XSAI, super2xsai, vf);
REGISTER_FILTER (SWAPUV, swapuv, vf);


+ 2
- 2
libavfilter/version.h View File

@@ -29,8 +29,8 @@
#include "libavutil/avutil.h"

#define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 13
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_MINOR 14
#define LIBAVFILTER_VERSION_MICRO 100

#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \


+ 303
- 0
libavfilter/vf_smartblur.c View File

@@ -0,0 +1,303 @@
/*
* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2012 Jeremy Tran
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU 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.
*/

/**
* @file
* Apply a smartblur filter to the input video
* Ported from MPlayer libmpcodecs/vf_smartblur.c by Michael Niedermayer.
*/

#include "libavutil/pixdesc.h"
#include "libswscale/swscale.h"

#include "avfilter.h"
#include "formats.h"
#include "internal.h"

#define RADIUS_MIN 0.1
#define RADIUS_MAX 5.0

#define STRENGTH_MIN -1.0
#define STRENGTH_MAX 1.0

#define THRESHOLD_MIN -30
#define THRESHOLD_MAX 30

typedef struct {
float radius;
float strength;
int threshold;
float quality;
struct SwsContext *filter_context;
} FilterParam;

typedef struct {
FilterParam luma;
FilterParam chroma;
int hsub;
int vsub;
unsigned int sws_flags;
} SmartblurContext;

#define CHECK_PARAM(param, name, min, max, format, ret) \
if (param < min || param > max) { \
av_log(ctx, AV_LOG_ERROR, \
"Invalid " #name " value " #format ": " \
"must be included between range " #format " and " #format "\n",\
param, min, max); \
ret = AVERROR(EINVAL); \
}

static av_cold int init(AVFilterContext *ctx, const char *args)
{
SmartblurContext *sblur = ctx->priv;
int n = 0, ret = 0;
float lradius, lstrength, cradius, cstrength;
int lthreshold, cthreshold;

if (args)
n = sscanf(args, "%f:%f:%d:%f:%f:%d",
&lradius, &lstrength, &lthreshold,
&cradius, &cstrength, &cthreshold);

if (n != 3 && n != 6) {
av_log(ctx, AV_LOG_ERROR,
"Incorrect number of parameters or invalid syntax: "
"must be luma_radius:luma_strength:luma_threshold"
"[:chroma_radius:chroma_strength:chroma_threshold]\n");
return AVERROR(EINVAL);
}

sblur->luma.radius = lradius;
sblur->luma.strength = lstrength;
sblur->luma.threshold = lthreshold;

if (n == 3) {
sblur->chroma.radius = sblur->luma.radius;
sblur->chroma.strength = sblur->luma.strength;
sblur->chroma.threshold = sblur->luma.threshold;
} else {
sblur->chroma.radius = cradius;
sblur->chroma.strength = cstrength;
sblur->chroma.threshold = cthreshold;
}

sblur->luma.quality = sblur->chroma.quality = 3.0;
sblur->sws_flags = SWS_BICUBIC;

CHECK_PARAM(lradius, luma radius, RADIUS_MIN, RADIUS_MAX, %0.1f, ret)
CHECK_PARAM(lstrength, luma strength, STRENGTH_MIN, STRENGTH_MAX, %0.1f, ret)
CHECK_PARAM(lthreshold, luma threshold, THRESHOLD_MIN, THRESHOLD_MAX, %d, ret)

if (n != 3) {
CHECK_PARAM(sblur->chroma.radius, chroma radius, RADIUS_MIN, RADIUS_MAX, %0.1f, ret)
CHECK_PARAM(sblur->chroma.strength, chroma strength, STRENGTH_MIN, STRENGTH_MAX, %0.1f, ret)
CHECK_PARAM(sblur->chroma.threshold, chroma threshold, THRESHOLD_MIN,THRESHOLD_MAX, %d, ret)
}

return ret;
}

static av_cold void uninit(AVFilterContext *ctx)
{
SmartblurContext *sblur = ctx->priv;

sws_freeContext(sblur->luma.filter_context);
sws_freeContext(sblur->chroma.filter_context);
}

static int query_formats(AVFilterContext *ctx)
{
static const enum PixelFormat pix_fmts[] = {
PIX_FMT_YUV444P, PIX_FMT_YUV422P,
PIX_FMT_YUV420P, PIX_FMT_YUV411P,
PIX_FMT_YUV410P, PIX_FMT_YUV440P,
PIX_FMT_GRAY8,
PIX_FMT_NONE
};

ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

return 0;
}

static int alloc_sws_context(FilterParam *f, int width, int height, unsigned int flags)
{
SwsVector *vec;
SwsFilter sws_filter;

vec = sws_getGaussianVec(f->radius, f->quality);

if (!vec)
return AVERROR(EINVAL);

sws_scaleVec(vec, f->strength);
vec->coeff[vec->length / 2] += 1.0 - f->strength;
sws_filter.lumH = sws_filter.lumV = vec;
sws_filter.chrH = sws_filter.chrV = NULL;
f->filter_context = sws_getCachedContext(NULL,
width, height, PIX_FMT_GRAY8,
width, height, PIX_FMT_GRAY8,
flags, &sws_filter, NULL, NULL);

sws_freeVec(vec);

if (!f->filter_context)
return AVERROR(EINVAL);

return 0;
}

static int config_props(AVFilterLink *inlink)
{
SmartblurContext *sblur = inlink->dst->priv;
const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format];

sblur->hsub = desc->log2_chroma_w;
sblur->vsub = desc->log2_chroma_h;

alloc_sws_context(&sblur->luma, inlink->w, inlink->h, sblur->sws_flags);
alloc_sws_context(&sblur->chroma,
inlink->w >> sblur->hsub, inlink->h >> sblur->vsub,
sblur->sws_flags);

return 0;
}

static void blur(uint8_t *dst, const int dst_linesize,
const uint8_t *src, const int src_linesize,
const int w, const int h, const int threshold,
struct SwsContext *filter_context)
{
int x, y;
int orig, filtered;
int diff;
/* Declare arrays of 4 to get aligned data */
const uint8_t* const src_array[4] = {src};
uint8_t *dst_array[4] = {dst};
int src_linesize_array[4] = {src_linesize};
int dst_linesize_array[4] = {dst_linesize};

sws_scale(filter_context, src_array, src_linesize_array,
0, h, dst_array, dst_linesize_array);

if (threshold > 0) {
for (y = 0; y < h; ++y) {
for (x = 0; x < w; ++x) {
orig = src[x + y * src_linesize];
filtered = dst[x + y * dst_linesize];
diff = orig - filtered;

if (diff > 0) {
if (diff > 2 * threshold)
dst[x + y * dst_linesize] = orig;
else if (diff > threshold)
/* add 'diff' and substract 'threshold' from 'filtered' */
dst[x + y * dst_linesize] = orig - threshold;
} else {
if (-diff > 2 * threshold)
dst[x + y * dst_linesize] = orig;
else if (-diff > threshold)
/* add 'diff' and 'threshold' to 'filtered' */
dst[x + y * dst_linesize] = orig + threshold;
}
}
}
} else if (threshold < 0) {
for (y = 0; y < h; ++y) {
for (x = 0; x < w; ++x) {
orig = src[x + y * src_linesize];
filtered = dst[x + y * dst_linesize];
diff = orig - filtered;

if (diff > 0) {
if (diff <= -threshold)
dst[x + y * dst_linesize] = orig;
else if (diff <= -2 * threshold)
/* substract 'diff' and 'threshold' from 'orig' */
dst[x + y * dst_linesize] = filtered - threshold;
} else {
if (diff >= threshold)
dst[x + y * dst_linesize] = orig;
else if (diff >= 2 * threshold)
/* add 'threshold' and substract 'diff' from 'orig' */
dst[x + y * dst_linesize] = filtered + threshold;
}
}
}
}
}

static int end_frame(AVFilterLink *inlink)
{
SmartblurContext *sblur = inlink->dst->priv;
AVFilterBufferRef *inpic = inlink->cur_buf;
AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf;
int cw = inlink->w >> sblur->hsub;
int ch = inlink->h >> sblur->vsub;

blur(outpic->data[0], outpic->linesize[0],
inpic->data[0], inpic->linesize[0],
inlink->w, inlink->h, sblur->luma.threshold,
sblur->luma.filter_context);

if (inpic->data[2]) {
blur(outpic->data[1], outpic->linesize[1],
inpic->data[1], inpic->linesize[1],
cw, ch, sblur->chroma.threshold,
sblur->chroma.filter_context);
blur(outpic->data[2], outpic->linesize[2],
inpic->data[2], inpic->linesize[2],
cw, ch, sblur->chroma.threshold,
sblur->chroma.filter_context);
}

return ff_end_frame(inlink->dst->outputs[0]);
}

AVFilter avfilter_vf_smartblur = {
.name = "smartblur",
.description = NULL_IF_CONFIG_SMALL("Blur the input video without impacting the outlines."),

.priv_size = sizeof(SmartblurContext),

.init = init,
.uninit = uninit,
.query_formats = query_formats,

.inputs = (const AVFilterPad[]) {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.end_frame = end_frame,
.config_props = config_props,
.min_perms = AV_PERM_READ,
},
{ .name = NULL }
},
.outputs = (const AVFilterPad[]) {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ .name = NULL }
}
};

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