lavfi: port boxblur filter from libmpcodecs
With the following additions: * support to gray format * support to yuva420p format * parametric luma/chroma/alpha radius * consistency check on the radius values, avoid crashes with invalid values
This commit is contained in:
Stefano Sabatini
parent
bb258fb995
commit
6b61920ab7
@ -4,6 +4,7 @@ releases are sorted from youngest to oldest.
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version next:
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- openal input device added
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- boxblur filter added
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version 0.8:
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1
configure
vendored
1
configure
vendored
@ -1497,6 +1497,7 @@ udp_protocol_deps="network"
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# filters
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blackframe_filter_deps="gpl"
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boxblur_filter_deps="gpl"
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cropdetect_filter_deps="gpl"
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drawtext_filter_deps="libfreetype"
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frei0r_filter_deps="frei0r dlopen strtok_r"
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@ -183,6 +183,66 @@ threshold, and defaults to 98.
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@var{threshold} is the threshold below which a pixel value is
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considered black, and defaults to 32.
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@section boxblur
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Apply boxblur algorithm to the input video.
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This filter accepts the parameters:
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@var{luma_power}:@var{luma_radius}:@var{chroma_radius}:@var{chroma_power}:@var{alpha_radius}:@var{alpha_power}
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Chroma and alpha parameters are optional, if not specified they default
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to the corresponding values set for @var{luma_radius} and
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@var{luma_power}.
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@var{luma_radius}, @var{chroma_radius}, and @var{alpha_radius} represent
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the radius in pixels of the box used for blurring the corresponding
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input plane. They are expressions, and can contain the following
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constants:
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@table @option
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@item w, h
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the input width and heigth in pixels
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@item cw, ch
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the input chroma image width and height in pixels
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@item hsub, vsub
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horizontal and vertical chroma subsample values. For example for the
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pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
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@end table
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The radius must be a non-negative number, and must be not greater than
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the value of the expression @code{min(w,h)/2} for the luma and alpha planes,
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and of @code{min(cw,ch)/2} for the chroma planes.
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@var{luma_power}, @var{chroma_power}, and @var{alpha_power} represent
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how many times the boxblur filter is applied to the corresponding
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plane.
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Some examples follow:
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@itemize
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@item
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Apply a boxblur filter with luma, chroma, and alpha radius
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set to 2:
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@example
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boxblur=2:1
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@end example
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@item
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Set luma radius to 2, alpha and chroma radius to 0
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@example
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boxblur=2:1:0:0:0:0
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@end example
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@item
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Set luma and chroma radius to a fraction of the video dimension
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@example
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boxblur=min(h\,w)/10:1:min(cw\,ch)/10:1
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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. Mainly useful for
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@ -25,6 +25,7 @@ OBJS-$(CONFIG_ANULLSRC_FILTER) += asrc_anullsrc.o
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OBJS-$(CONFIG_ANULLSINK_FILTER) += asink_anullsink.o
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OBJS-$(CONFIG_BLACKFRAME_FILTER) += vf_blackframe.o
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OBJS-$(CONFIG_BOXBLUR_FILTER) += vf_boxblur.o
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OBJS-$(CONFIG_COPY_FILTER) += vf_copy.o
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OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
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OBJS-$(CONFIG_CROPDETECT_FILTER) += vf_cropdetect.o
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@ -41,6 +41,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER (ANULLSINK, anullsink, asink);
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REGISTER_FILTER (BLACKFRAME, blackframe, vf);
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REGISTER_FILTER (BOXBLUR, boxblur, vf);
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REGISTER_FILTER (COPY, copy, vf);
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REGISTER_FILTER (CROP, crop, vf);
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REGISTER_FILTER (CROPDETECT, cropdetect, vf);
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@ -29,8 +29,8 @@
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#include "libavutil/rational.h"
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#define LIBAVFILTER_VERSION_MAJOR 2
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#define LIBAVFILTER_VERSION_MINOR 24
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#define LIBAVFILTER_VERSION_MICRO 4
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#define LIBAVFILTER_VERSION_MINOR 25
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#define LIBAVFILTER_VERSION_MICRO 0
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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LIBAVFILTER_VERSION_MINOR, \
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350
libavfilter/vf_boxblur.c
Normal file
350
libavfilter/vf_boxblur.c
Normal file
@ -0,0 +1,350 @@
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/*
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* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2011 Stefano Sabatini
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* Apply a boxblur filter to the input video.
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* Ported from MPlayer libmpcodecs/vf_boxblur.c.
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/eval.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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static const char *var_names[] = {
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"w",
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"h",
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"cw",
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"ch",
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"hsub",
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"vsub",
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NULL
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};
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enum var_name {
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VAR_W,
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VAR_H,
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VAR_CW,
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VAR_CH,
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VAR_HSUB,
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VAR_VSUB,
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VARS_NB
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};
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typedef struct {
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int radius;
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int power;
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} FilterParam;
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typedef struct {
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FilterParam luma_param;
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FilterParam chroma_param;
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FilterParam alpha_param;
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char luma_radius_expr [256];
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char chroma_radius_expr[256];
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char alpha_radius_expr [256];
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int hsub, vsub;
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int radius[4];
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int power[4];
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uint8_t *temp[2]; ///< temporary buffer used in blur_power()
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} BoxBlurContext;
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#define Y 0
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#define U 1
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#define V 2
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#define A 3
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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BoxBlurContext *boxblur = ctx->priv;
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int e;
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if (!args) {
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av_log(ctx, AV_LOG_ERROR,
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"Filter expects 2 or 4 arguments, none provided\n");
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return AVERROR(EINVAL);
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}
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e = sscanf(args, "%255[^:]:%d:%255[^:]:%d:%255[^:]:%d",
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boxblur->luma_radius_expr, &boxblur->luma_param .power,
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boxblur->chroma_radius_expr, &boxblur->chroma_param.power,
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boxblur->alpha_radius_expr, &boxblur->alpha_param .power);
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if (e != 2 && e != 4 && e != 6) {
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av_log(ctx, AV_LOG_ERROR,
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"Filter expects 2 or 4 or 6 params, provided %d\n", e);
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return AVERROR(EINVAL);
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}
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if (e < 4) {
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boxblur->chroma_param.power = boxblur->luma_param.power;
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av_strlcpy(boxblur->chroma_radius_expr, boxblur->luma_radius_expr,
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sizeof(boxblur->chroma_radius_expr));
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}
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if (e < 6) {
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boxblur->alpha_param.power = boxblur->luma_param.power;
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av_strlcpy(boxblur->alpha_radius_expr, boxblur->luma_radius_expr,
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sizeof(boxblur->alpha_radius_expr));
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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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BoxBlurContext *boxblur = ctx->priv;
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av_freep(&boxblur->temp[0]);
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av_freep(&boxblur->temp[1]);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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enum PixelFormat pix_fmts[] = {
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PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
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PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_YUVA420P,
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PIX_FMT_YUV440P, PIX_FMT_GRAY8,
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PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
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PIX_FMT_YUVJ440P,
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PIX_FMT_NONE
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};
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avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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BoxBlurContext *boxblur = ctx->priv;
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const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[inlink->format];
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int w = inlink->w, h = inlink->h;
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int cw, ch;
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double var_values[VARS_NB], res;
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char *expr;
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int ret;
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if (!(boxblur->temp[0] = av_malloc(w)) ||
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!(boxblur->temp[1] = av_malloc(w)))
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return AVERROR(ENOMEM);
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boxblur->hsub = desc->log2_chroma_w;
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boxblur->vsub = desc->log2_chroma_h;
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var_values[VAR_W] = inlink->w;
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var_values[VAR_H] = inlink->h;
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var_values[VAR_CW] = cw = w>>boxblur->hsub;
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var_values[VAR_CH] = ch = h>>boxblur->vsub;
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var_values[VAR_HSUB] = 1<<boxblur->hsub;
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var_values[VAR_VSUB] = 1<<boxblur->vsub;
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#define EVAL_RADIUS_EXPR(comp) \
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expr = boxblur->comp##_radius_expr; \
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ret = av_expr_parse_and_eval(&res, expr, var_names, var_values, \
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NULL, NULL, NULL, NULL, NULL, 0, ctx); \
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boxblur->comp##_param.radius = res; \
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if (ret < 0) { \
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av_log(NULL, AV_LOG_ERROR, \
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"Error when evaluating " #comp " radius expression '%s'\n", expr); \
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return ret; \
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}
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EVAL_RADIUS_EXPR(luma);
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EVAL_RADIUS_EXPR(chroma);
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EVAL_RADIUS_EXPR(alpha);
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av_log(ctx, AV_LOG_INFO,
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"luma_radius:%d luma_power:%d "
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"chroma_radius:%d chroma_power:%d "
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"alpha_radius:%d alpha_power:%d "
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"w:%d chroma_w:%d h:%d chroma_h:%d\n",
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boxblur->luma_param .radius, boxblur->luma_param .power,
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boxblur->chroma_param.radius, boxblur->chroma_param.power,
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boxblur->alpha_param .radius, boxblur->alpha_param .power,
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w, cw, h, ch);
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#define CHECK_RADIUS_VAL(w_, h_, comp) \
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if (boxblur->comp##_param.radius < 0 || \
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2*boxblur->comp##_param.radius > FFMIN(w_, h_)) { \
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av_log(ctx, AV_LOG_ERROR, \
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"Invalid " #comp " radius value %d, must be >= 0 and <= %d\n", \
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boxblur->comp##_param.radius, FFMIN(w_, h_)/2); \
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return AVERROR(EINVAL); \
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}
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CHECK_RADIUS_VAL(w, h, luma);
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CHECK_RADIUS_VAL(cw, ch, chroma);
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CHECK_RADIUS_VAL(w, h, alpha);
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boxblur->radius[Y] = boxblur->luma_param.radius;
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boxblur->radius[U] = boxblur->radius[V] = boxblur->chroma_param.radius;
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boxblur->radius[A] = boxblur->alpha_param.radius;
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boxblur->power[Y] = boxblur->luma_param.power;
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boxblur->power[U] = boxblur->power[V] = boxblur->chroma_param.power;
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boxblur->power[A] = boxblur->alpha_param.power;
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return 0;
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}
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static inline void blur(uint8_t *dst, int dst_step, const uint8_t *src, int src_step,
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int w, int radius)
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{
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/* Naive boxblur would sum source pixels from x-radius .. x+radius
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* for destination pixel x. That would be O(radius*width).
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* If you now look at what source pixels represent 2 consecutive
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* output pixels, then you see they are almost identical and only
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* differ by 2 pixels, like:
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* src0 111111111
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* dst0 1
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* src1 111111111
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* dst1 1
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* src0-src1 1 -1
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* so when you know one output pixel you can find the next by just adding
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* and subtracting 1 input pixel.
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* The following code adopts this faster variant.
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*/
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int x, sum = 0;
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const int length = radius*2 + 1;
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const int inv = ((1<<16) + length/2)/length;
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for (x = 0; x < radius; x++)
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sum += src[x*src_step]<<1;
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sum += src[radius*src_step];
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for (x = 0; x <= radius; x++) {
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sum += src[(radius+x)*src_step] - src[(radius-x)*src_step];
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dst[x*dst_step] = (sum*inv + (1<<15))>>16;
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}
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for (; x < w-radius; x++) {
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sum += src[(radius+x)*src_step] - src[(x-radius-1)*src_step];
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dst[x*dst_step] = (sum*inv + (1<<15))>>16;
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}
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for (; x < w; x++) {
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sum += src[(2*w-radius-x-1)*src_step] - src[(x-radius-1)*src_step];
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dst[x*dst_step] = (sum*inv + (1<<15))>>16;
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}
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}
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static inline void blur_power(uint8_t *dst, int dst_step, const uint8_t *src, int src_step,
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int w, int radius, int power, uint8_t *temp[2])
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{
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uint8_t *a = temp[0], *b = temp[1];
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if (radius && power) {
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blur(a, 1, src, src_step, w, radius);
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for (; power > 2; power--) {
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uint8_t *c;
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blur(b, 1, a, 1, w, radius);
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c = a; a = b; b = c;
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}
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if (power > 1) {
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blur(dst, dst_step, a, 1, w, radius);
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} else {
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int i;
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for (i = 0; i < w; i++)
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dst[i*dst_step] = a[i];
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}
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} else {
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int i;
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for (i = 0; i < w; i++)
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dst[i*dst_step] = src[i*src_step];
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}
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}
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static void hblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize,
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int w, int h, int radius, int power, uint8_t *temp[2])
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{
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int y;
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if (radius == 0 && dst == src)
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return;
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for (y = 0; y < h; y++)
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blur_power(dst + y*dst_linesize, 1, src + y*src_linesize, 1,
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w, radius, power, temp);
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}
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static void vblur(uint8_t *dst, int dst_linesize, const uint8_t *src, int src_linesize,
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int w, int h, int radius, int power, uint8_t *temp[2])
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{
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int x;
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if (radius == 0 && dst == src)
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return;
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for (x = 0; x < w; x++)
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blur_power(dst + x, dst_linesize, src + x, src_linesize,
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h, radius, power, temp);
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}
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static void draw_slice(AVFilterLink *inlink, int y0, int h0, int slice_dir)
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{
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AVFilterContext *ctx = inlink->dst;
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BoxBlurContext *boxblur = ctx->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFilterBufferRef *inpicref = inlink ->cur_buf;
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AVFilterBufferRef *outpicref = outlink->out_buf;
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int plane;
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int cw = inlink->w >> boxblur->hsub, ch = h0 >> boxblur->vsub;
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int w[4] = { inlink->w, cw, cw, inlink->w };
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int h[4] = { h0, ch, ch, h0 };
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uint8_t *dst[4], *src[4];
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for (plane = 0; inpicref->data[plane] && plane < 4; plane++) {
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int y = plane == 1 || plane == 2 ? y0 >> boxblur->vsub : y0;
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src[plane] = inpicref ->data[plane] + inpicref ->linesize[plane] * y;
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dst[plane] = outpicref->data[plane] + outpicref->linesize[plane] * y;
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}
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for (plane = 0; inpicref->data[plane] && plane < 4; plane++)
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hblur(outpicref->data[plane], outpicref->linesize[plane],
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inpicref ->data[plane], inpicref ->linesize[plane],
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w[plane], h[plane], boxblur->radius[plane], boxblur->power[plane],
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boxblur->temp);
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|
||||
for (plane = 0; inpicref->data[plane] && plane < 4; plane++)
|
||||
vblur(outpicref->data[plane], outpicref->linesize[plane],
|
||||
outpicref->data[plane], outpicref->linesize[plane],
|
||||
w[plane], h[plane], boxblur->radius[plane], boxblur->power[plane],
|
||||
boxblur->temp);
|
||||
}
|
||||
|
||||
AVFilter avfilter_vf_boxblur = {
|
||||
.name = "boxblur",
|
||||
.description = NULL_IF_CONFIG_SMALL("Blur the input."),
|
||||
.priv_size = sizeof(BoxBlurContext),
|
||||
.init = init,
|
||||
.uninit = uninit,
|
||||
.query_formats = query_formats,
|
||||
|
||||
.inputs = (AVFilterPad[]) {{ .name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.config_props = config_input,
|
||||
.draw_slice = draw_slice,
|
||||
.min_perms = AV_PERM_READ },
|
||||
{ .name = NULL}},
|
||||
.outputs = (AVFilterPad[]) {{ .name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO, },
|
||||
{ .name = NULL}},
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user