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/* |
* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at> |
* |
* 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 |
* Shape Adaptive Blur filter, ported from MPlayer libmpcodecs/vf_sab.c |
*/ |
|
#include "libavutil/opt.h" |
#include "libavutil/pixdesc.h" |
#include "libswscale/swscale.h" |
|
#include "avfilter.h" |
#include "formats.h" |
#include "internal.h" |
|
typedef struct { |
float radius; |
float pre_filter_radius; |
float strength; |
float quality; |
struct SwsContext *pre_filter_context; |
uint8_t *pre_filter_buf; |
int pre_filter_linesize; |
int dist_width; |
int dist_linesize; |
int *dist_coeff; |
#define COLOR_DIFF_COEFF_SIZE 512 |
int color_diff_coeff[COLOR_DIFF_COEFF_SIZE]; |
} FilterParam; |
|
typedef struct { |
const AVClass *class; |
FilterParam luma; |
FilterParam chroma; |
int hsub; |
int vsub; |
unsigned int sws_flags; |
} SabContext; |
|
static int query_formats(AVFilterContext *ctx) |
{ |
static const enum AVPixelFormat pix_fmts[] = { |
AV_PIX_FMT_YUV420P, |
AV_PIX_FMT_YUV410P, |
AV_PIX_FMT_YUV444P, |
AV_PIX_FMT_YUV422P, |
AV_PIX_FMT_YUV411P, |
AV_PIX_FMT_NONE |
}; |
AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts); |
if (!fmts_list) |
return AVERROR(ENOMEM); |
return ff_set_common_formats(ctx, fmts_list); |
} |
|
#define RADIUS_MIN 0.1 |
#define RADIUS_MAX 4.0 |
|
#define PRE_FILTER_RADIUS_MIN 0.1 |
#define PRE_FILTER_RADIUS_MAX 2.0 |
|
#define STRENGTH_MIN 0.1 |
#define STRENGTH_MAX 100.0 |
|
#define OFFSET(x) offsetof(SabContext, x) |
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
|
static const AVOption sab_options[] = { |
{ "luma_radius", "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, |
{ "lr" , "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS }, |
{ "luma_pre_filter_radius", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, |
{ "lpfr", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, |
{ "luma_strength", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, |
{ "ls", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS }, |
|
{ "chroma_radius", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, |
{ "cr", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS }, |
{ "chroma_pre_filter_radius", "set chroma pre-filter radius", OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1}, |
PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, |
{ "cpfr", "set chroma pre-filter radius", OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1}, |
PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS }, |
{ "chroma_strength", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, |
{ "cs", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS }, |
|
{ NULL } |
}; |
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AVFILTER_DEFINE_CLASS(sab); |
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static av_cold int init(AVFilterContext *ctx) |
{ |
SabContext *s = ctx->priv; |
|
/* make chroma default to luma values, if not explicitly set */ |
if (s->chroma.radius < RADIUS_MIN) |
s->chroma.radius = s->luma.radius; |
if (s->chroma.pre_filter_radius < PRE_FILTER_RADIUS_MIN) |
s->chroma.pre_filter_radius = s->luma.pre_filter_radius; |
if (s->chroma.strength < STRENGTH_MIN) |
s->chroma.strength = s->luma.strength; |
|
s->luma.quality = s->chroma.quality = 3.0; |
s->sws_flags = SWS_POINT; |
|
av_log(ctx, AV_LOG_VERBOSE, |
"luma_radius:%f luma_pre_filter_radius::%f luma_strength:%f " |
"chroma_radius:%f chroma_pre_filter_radius:%f chroma_strength:%f\n", |
s->luma .radius, s->luma .pre_filter_radius, s->luma .strength, |
s->chroma.radius, s->chroma.pre_filter_radius, s->chroma.strength); |
return 0; |
} |
|
static void close_filter_param(FilterParam *f) |
{ |
if (f->pre_filter_context) { |
sws_freeContext(f->pre_filter_context); |
f->pre_filter_context = NULL; |
} |
av_freep(&f->pre_filter_buf); |
av_freep(&f->dist_coeff); |
} |
|
static av_cold void uninit(AVFilterContext *ctx) |
{ |
SabContext *s = ctx->priv; |
|
close_filter_param(&s->luma); |
close_filter_param(&s->chroma); |
} |
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static int open_filter_param(FilterParam *f, int width, int height, unsigned int sws_flags) |
{ |
SwsVector *vec; |
SwsFilter sws_f; |
int i, x, y; |
int linesize = FFALIGN(width, 8); |
|
f->pre_filter_buf = av_malloc(linesize * height); |
if (!f->pre_filter_buf) |
return AVERROR(ENOMEM); |
|
f->pre_filter_linesize = linesize; |
vec = sws_getGaussianVec(f->pre_filter_radius, f->quality); |
sws_f.lumH = sws_f.lumV = vec; |
sws_f.chrH = sws_f.chrV = NULL; |
f->pre_filter_context = sws_getContext(width, height, AV_PIX_FMT_GRAY8, |
width, height, AV_PIX_FMT_GRAY8, |
sws_flags, &sws_f, NULL, NULL); |
sws_freeVec(vec); |
|
vec = sws_getGaussianVec(f->strength, 5.0); |
for (i = 0; i < COLOR_DIFF_COEFF_SIZE; i++) { |
double d; |
int index = i-COLOR_DIFF_COEFF_SIZE/2 + vec->length/2; |
|
if (index < 0 || index >= vec->length) d = 0.0; |
else d = vec->coeff[index]; |
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f->color_diff_coeff[i] = (int)(d/vec->coeff[vec->length/2]*(1<<12) + 0.5); |
} |
sws_freeVec(vec); |
|
vec = sws_getGaussianVec(f->radius, f->quality); |
f->dist_width = vec->length; |
f->dist_linesize = FFALIGN(vec->length, 8); |
f->dist_coeff = av_malloc_array(f->dist_width, f->dist_linesize * sizeof(*f->dist_coeff)); |
if (!f->dist_coeff) { |
sws_freeVec(vec); |
return AVERROR(ENOMEM); |
} |
|
for (y = 0; y < vec->length; y++) { |
for (x = 0; x < vec->length; x++) { |
double d = vec->coeff[x] * vec->coeff[y]; |
f->dist_coeff[x + y*f->dist_linesize] = (int)(d*(1<<10) + 0.5); |
} |
} |
sws_freeVec(vec); |
|
return 0; |
} |
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static int config_props(AVFilterLink *inlink) |
{ |
SabContext *s = inlink->dst->priv; |
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
int ret; |
|
s->hsub = desc->log2_chroma_w; |
s->vsub = desc->log2_chroma_h; |
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close_filter_param(&s->luma); |
ret = open_filter_param(&s->luma, inlink->w, inlink->h, s->sws_flags); |
if (ret < 0) |
return ret; |
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close_filter_param(&s->chroma); |
ret = open_filter_param(&s->chroma, |
FF_CEIL_RSHIFT(inlink->w, s->hsub), |
FF_CEIL_RSHIFT(inlink->h, s->vsub), s->sws_flags); |
return ret; |
} |
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#define NB_PLANES 4 |
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static void blur(uint8_t *dst, const int dst_linesize, |
const uint8_t *src, const int src_linesize, |
const int w, const int h, FilterParam *fp) |
{ |
int x, y; |
FilterParam f = *fp; |
const int radius = f.dist_width/2; |
|
const uint8_t * const src2[NB_PLANES] = { src }; |
int src2_linesize[NB_PLANES] = { src_linesize }; |
uint8_t *dst2[NB_PLANES] = { f.pre_filter_buf }; |
int dst2_linesize[NB_PLANES] = { f.pre_filter_linesize }; |
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sws_scale(f.pre_filter_context, src2, src2_linesize, 0, h, dst2, dst2_linesize); |
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#define UPDATE_FACTOR do { \ |
int factor; \ |
factor = f.color_diff_coeff[COLOR_DIFF_COEFF_SIZE/2 + pre_val - \ |
f.pre_filter_buf[ix + iy*f.pre_filter_linesize]] * f.dist_coeff[dx + dy*f.dist_linesize]; \ |
sum += src[ix + iy*src_linesize] * factor; \ |
div += factor; \ |
} while (0) |
|
for (y = 0; y < h; y++) { |
for (x = 0; x < w; x++) { |
int sum = 0; |
int div = 0; |
int dy; |
const int pre_val = f.pre_filter_buf[x + y*f.pre_filter_linesize]; |
if (x >= radius && x < w - radius) { |
for (dy = 0; dy < radius*2 + 1; dy++) { |
int dx; |
int iy = y+dy - radius; |
iy = avpriv_mirror(iy, h-1); |
|
for (dx = 0; dx < radius*2 + 1; dx++) { |
const int ix = x+dx - radius; |
UPDATE_FACTOR; |
} |
} |
} else { |
for (dy = 0; dy < radius*2+1; dy++) { |
int dx; |
int iy = y+dy - radius; |
iy = avpriv_mirror(iy, h-1); |
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for (dx = 0; dx < radius*2 + 1; dx++) { |
int ix = x+dx - radius; |
ix = avpriv_mirror(ix, w-1); |
UPDATE_FACTOR; |
} |
} |
} |
dst[x + y*dst_linesize] = (sum + div/2) / div; |
} |
} |
} |
|
static int filter_frame(AVFilterLink *inlink, AVFrame *inpic) |
{ |
SabContext *s = inlink->dst->priv; |
AVFilterLink *outlink = inlink->dst->outputs[0]; |
AVFrame *outpic; |
|
outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
if (!outpic) { |
av_frame_free(&inpic); |
return AVERROR(ENOMEM); |
} |
av_frame_copy_props(outpic, inpic); |
|
blur(outpic->data[0], outpic->linesize[0], inpic->data[0], inpic->linesize[0], |
inlink->w, inlink->h, &s->luma); |
if (inpic->data[2]) { |
int cw = FF_CEIL_RSHIFT(inlink->w, s->hsub); |
int ch = FF_CEIL_RSHIFT(inlink->h, s->vsub); |
blur(outpic->data[1], outpic->linesize[1], inpic->data[1], inpic->linesize[1], cw, ch, &s->chroma); |
blur(outpic->data[2], outpic->linesize[2], inpic->data[2], inpic->linesize[2], cw, ch, &s->chroma); |
} |
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av_frame_free(&inpic); |
return ff_filter_frame(outlink, outpic); |
} |
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static const AVFilterPad sab_inputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
.filter_frame = filter_frame, |
.config_props = config_props, |
}, |
{ NULL } |
}; |
|
static const AVFilterPad sab_outputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
}, |
{ NULL } |
}; |
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AVFilter ff_vf_sab = { |
.name = "sab", |
.description = NULL_IF_CONFIG_SMALL("Apply shape adaptive blur."), |
.priv_size = sizeof(SabContext), |
.init = init, |
.uninit = uninit, |
.query_formats = query_formats, |
.inputs = sab_inputs, |
.outputs = sab_outputs, |
.priv_class = &sab_class, |
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
}; |