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ffmpeg/libavfilter/vf_geq.c
Andreas Rheinhardt b4f5201967 avfilter: Replace query_formats callback with union of list and callback 
If one looks at the many query_formats callbacks in existence,
one will immediately recognize that there is one type of default
callback for video and a slightly different default callback for
audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);"
for video with a filter-specific pix_fmts list. For audio, it is
the same with a filter-specific sample_fmts list together with
ff_set_common_all_samplerates() and ff_set_common_all_channel_counts().

This commit allows to remove the boilerplate query_formats callbacks
by replacing said callback with a union consisting the old callback
and pointers for pixel and sample format arrays. For the not uncommon
case in which these lists only contain a single entry (besides the
sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also
added to the union to store them directly in the AVFilter,
thereby avoiding a relocation.

The state of said union will be contained in a new, dedicated AVFilter
field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t
in order to create a hole for this new field; this is no problem, as
the maximum of all the nb_inputs is four; for nb_outputs it is only
two).

The state's default value coincides with the earlier default of
query_formats being unset, namely that the filter accepts all formats
(and also sample rates and channel counts/layouts for audio)
provided that these properties agree coincide for all inputs and
outputs.

By using different union members for audio and video filters
the type-unsafety of using the same functions for audio and video
lists will furthermore be more confined to formats.c than before.

When the new fields are used, they will also avoid allocations:
Currently something nearly equivalent to ff_default_query_formats()
is called after every successful call to a query_formats callback;
yet in the common case that the newly allocated AVFilterFormats
are not used at all (namely if there are no free links) these newly
allocated AVFilterFormats are freed again without ever being used.
Filters no longer using the callback will not exhibit this any more.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-10-05 17:48:25 +02:00

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/*
* Copyright (C) 2006 Michael Niedermayer <michaelni@gmx.at>
* Copyright (C) 2012 Clément Bœsch <u pkh me>
*
* 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
*/
/**
* @file
* Generic equation change filter
* Originally written by Michael Niedermayer for the MPlayer project, and
* ported by Clément Bœsch for FFmpeg.
*/
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/eval.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "internal.h"
#define MAX_NB_THREADS 32
#define NB_PLANES 4
enum InterpolationMethods {
INTERP_NEAREST,
INTERP_BILINEAR,
NB_INTERP
};
static const char *const var_names[] = { "X", "Y", "W", "H", "N", "SW", "SH", "T", NULL };
enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_N, VAR_SW, VAR_SH, VAR_T, VAR_VARS_NB };
typedef struct GEQContext {
const AVClass *class;
AVExpr *e[NB_PLANES][MAX_NB_THREADS]; ///< expressions for each plane and thread
char *expr_str[4+3]; ///< expression strings for each plane
AVFrame *picref; ///< current input buffer
uint8_t *dst; ///< reference pointer to the 8bits output
uint16_t *dst16; ///< reference pointer to the 16bits output
double values[VAR_VARS_NB]; ///< expression values
int hsub, vsub; ///< chroma subsampling
int planes; ///< number of planes
int interpolation;
int is_rgb;
int bps;
double *pixel_sums[NB_PLANES];
int needs_sum[NB_PLANES];
} GEQContext;
enum { Y = 0, U, V, A, G, B, R };
#define OFFSET(x) offsetof(GEQContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption geq_options[] = {
{ "lum_expr", "set luminance expression", OFFSET(expr_str[Y]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "lum", "set luminance expression", OFFSET(expr_str[Y]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "cb_expr", "set chroma blue expression", OFFSET(expr_str[U]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "cb", "set chroma blue expression", OFFSET(expr_str[U]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "cr_expr", "set chroma red expression", OFFSET(expr_str[V]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "cr", "set chroma red expression", OFFSET(expr_str[V]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "alpha_expr", "set alpha expression", OFFSET(expr_str[A]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "a", "set alpha expression", OFFSET(expr_str[A]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "red_expr", "set red expression", OFFSET(expr_str[R]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "r", "set red expression", OFFSET(expr_str[R]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "green_expr", "set green expression", OFFSET(expr_str[G]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "g", "set green expression", OFFSET(expr_str[G]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "blue_expr", "set blue expression", OFFSET(expr_str[B]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "b", "set blue expression", OFFSET(expr_str[B]), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
{ "interpolation","set interpolation method", OFFSET(interpolation), AV_OPT_TYPE_INT, {.i64=INTERP_BILINEAR}, 0, NB_INTERP-1, FLAGS, "interp" },
{ "i", "set interpolation method", OFFSET(interpolation), AV_OPT_TYPE_INT, {.i64=INTERP_BILINEAR}, 0, NB_INTERP-1, FLAGS, "interp" },
{ "nearest", "nearest interpolation", 0, AV_OPT_TYPE_CONST, {.i64=INTERP_NEAREST}, 0, 0, FLAGS, "interp" },
{ "n", "nearest interpolation", 0, AV_OPT_TYPE_CONST, {.i64=INTERP_NEAREST}, 0, 0, FLAGS, "interp" },
{ "bilinear", "bilinear interpolation", 0, AV_OPT_TYPE_CONST, {.i64=INTERP_BILINEAR}, 0, 0, FLAGS, "interp" },
{ "b", "bilinear interpolation", 0, AV_OPT_TYPE_CONST, {.i64=INTERP_BILINEAR}, 0, 0, FLAGS, "interp" },
{NULL},
};
AVFILTER_DEFINE_CLASS(geq);
static inline double getpix(void *priv, double x, double y, int plane)
{
int xi, yi;
GEQContext *geq = priv;
AVFrame *picref = geq->picref;
const uint8_t *src = picref->data[plane];
int linesize = picref->linesize[plane];
const int w = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(picref->width, geq->hsub) : picref->width;
const int h = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(picref->height, geq->vsub) : picref->height;
if (!src)
return 0;
if (geq->interpolation == INTERP_BILINEAR) {
xi = x = av_clipd(x, 0, w - 2);
yi = y = av_clipd(y, 0, h - 2);
x -= xi;
y -= yi;
if (geq->bps > 8) {
const uint16_t *src16 = (const uint16_t*)src;
linesize /= 2;
return (1-y)*((1-x)*src16[xi + yi * linesize] + x*src16[xi + 1 + yi * linesize])
+ y *((1-x)*src16[xi + (yi+1) * linesize] + x*src16[xi + 1 + (yi+1) * linesize]);
} else {
return (1-y)*((1-x)*src[xi + yi * linesize] + x*src[xi + 1 + yi * linesize])
+ y *((1-x)*src[xi + (yi+1) * linesize] + x*src[xi + 1 + (yi+1) * linesize]);
}
} else {
xi = av_clipd(x, 0, w - 1);
yi = av_clipd(y, 0, h - 1);
if (geq->bps > 8) {
const uint16_t *src16 = (const uint16_t*)src;
linesize /= 2;
return src16[xi + yi * linesize];
} else {
return src[xi + yi * linesize];
}
}
}
static int calculate_sums(GEQContext *geq, int plane, int w, int h)
{
int xi, yi;
AVFrame *picref = geq->picref;
const uint8_t *src = picref->data[plane];
int linesize = picref->linesize[plane];
if (!geq->pixel_sums[plane])
geq->pixel_sums[plane] = av_malloc_array(w, h * sizeof (*geq->pixel_sums[plane]));
if (!geq->pixel_sums[plane])
return AVERROR(ENOMEM);
if (geq->bps > 8)
linesize /= 2;
for (yi = 0; yi < h; yi ++) {
if (geq->bps > 8) {
const uint16_t *src16 = (const uint16_t*)src;
double linesum = 0;
for (xi = 0; xi < w; xi ++) {
linesum += src16[xi + yi * linesize];
geq->pixel_sums[plane][xi + yi * w] = linesum;
}
} else {
double linesum = 0;
for (xi = 0; xi < w; xi ++) {
linesum += src[xi + yi * linesize];
geq->pixel_sums[plane][xi + yi * w] = linesum;
}
}
if (yi)
for (xi = 0; xi < w; xi ++) {
geq->pixel_sums[plane][xi + yi * w] += geq->pixel_sums[plane][xi + yi * w - w];
}
}
return 0;
}
static inline double getpix_integrate_internal(GEQContext *geq, int x, int y, int plane, int w, int h)
{
if (x > w - 1) {
double boundary = getpix_integrate_internal(geq, w - 1, y, plane, w, h);
return 2*boundary - getpix_integrate_internal(geq, 2*(w - 1) - x, y, plane, w, h);
} else if (y > h - 1) {
double boundary = getpix_integrate_internal(geq, x, h - 1, plane, w, h);
return 2*boundary - getpix_integrate_internal(geq, x, 2*(h - 1) - y, plane, w, h);
} else if (x < 0) {
if (x == -1) return 0;
return - getpix_integrate_internal(geq, -x-2, y, plane, w, h);
} else if (y < 0) {
if (y == -1) return 0;
return - getpix_integrate_internal(geq, x, -y-2, plane, w, h);
}
return geq->pixel_sums[plane][x + y * w];
}
static inline double getpix_integrate(void *priv, double x, double y, int plane) {
GEQContext *geq = priv;
AVFrame *picref = geq->picref;
const uint8_t *src = picref->data[plane];
const int w = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(picref->width, geq->hsub) : picref->width;
const int h = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(picref->height, geq->vsub) : picref->height;
if (!src)
return 0;
return getpix_integrate_internal(geq, lrint(av_clipd(x, -w, 2*w)), lrint(av_clipd(y, -h, 2*h)), plane, w, h);
}
//TODO: cubic interpolate
//TODO: keep the last few frames
static double lum(void *priv, double x, double y) { return getpix(priv, x, y, 0); }
static double cb(void *priv, double x, double y) { return getpix(priv, x, y, 1); }
static double cr(void *priv, double x, double y) { return getpix(priv, x, y, 2); }
static double alpha(void *priv, double x, double y) { return getpix(priv, x, y, 3); }
static double lumsum(void *priv, double x, double y) { return getpix_integrate(priv, x, y, 0); }
static double cbsum(void *priv, double x, double y) { return getpix_integrate(priv, x, y, 1); }
static double crsub(void *priv, double x, double y) { return getpix_integrate(priv, x, y, 2); }
static double alphasum(void *priv, double x, double y) { return getpix_integrate(priv, x, y, 3); }
static av_cold int geq_init(AVFilterContext *ctx)
{
GEQContext *geq = ctx->priv;
int plane, ret = 0;
if (!geq->expr_str[Y] && !geq->expr_str[G] && !geq->expr_str[B] && !geq->expr_str[R]) {
av_log(ctx, AV_LOG_ERROR, "A luminance or RGB expression is mandatory\n");
ret = AVERROR(EINVAL);
goto end;
}
geq->is_rgb = !geq->expr_str[Y];
if ((geq->expr_str[Y] || geq->expr_str[U] || geq->expr_str[V]) && (geq->expr_str[G] || geq->expr_str[B] || geq->expr_str[R])) {
av_log(ctx, AV_LOG_ERROR, "Either YCbCr or RGB but not both must be specified\n");
ret = AVERROR(EINVAL);
goto end;
}
if (!geq->expr_str[U] && !geq->expr_str[V]) {
/* No chroma at all: fallback on luma */
geq->expr_str[U] = av_strdup(geq->expr_str[Y]);
geq->expr_str[V] = av_strdup(geq->expr_str[Y]);
} else {
/* One chroma unspecified, fallback on the other */
if (!geq->expr_str[U]) geq->expr_str[U] = av_strdup(geq->expr_str[V]);
if (!geq->expr_str[V]) geq->expr_str[V] = av_strdup(geq->expr_str[U]);
}
if (!geq->expr_str[A]) {
geq->expr_str[A] = av_asprintf("%d", (1<<geq->bps) - 1);
}
if (!geq->expr_str[G])
geq->expr_str[G] = av_strdup("g(X,Y)");
if (!geq->expr_str[B])
geq->expr_str[B] = av_strdup("b(X,Y)");
if (!geq->expr_str[R])
geq->expr_str[R] = av_strdup("r(X,Y)");
if (geq->is_rgb ?
(!geq->expr_str[G] || !geq->expr_str[B] || !geq->expr_str[R])
:
(!geq->expr_str[U] || !geq->expr_str[V] || !geq->expr_str[A])) {
ret = AVERROR(ENOMEM);
goto end;
}
for (plane = 0; plane < NB_PLANES; plane++) {
static double (*const p[])(void *, double, double) = {
lum , cb , cr , alpha ,
lumsum, cbsum, crsub, alphasum,
};
static const char *const func2_yuv_names[] = {
"lum" , "cb" , "cr" , "alpha" , "p",
"lumsum", "cbsum", "crsum", "alphasum", "psum",
NULL };
static const char *const func2_rgb_names[] = {
"g" , "b" , "r" , "alpha" , "p",
"gsum", "bsum", "rsum", "alphasum", "psum",
NULL };
const char *const *func2_names = geq->is_rgb ? func2_rgb_names : func2_yuv_names;
double (*const func2[])(void *, double, double) = {
lum , cb , cr , alpha , p[plane],
lumsum, cbsum, crsub, alphasum, p[plane + 4],
NULL };
int counter[10] = {0};
for (int i = 0; i < MAX_NB_THREADS; i++) {
ret = av_expr_parse(&geq->e[plane][i], geq->expr_str[plane < 3 && geq->is_rgb ? plane+4 : plane], var_names,
NULL, NULL, func2_names, func2, 0, ctx);
if (ret < 0)
goto end;
}
av_expr_count_func(geq->e[plane][0], counter, FF_ARRAY_ELEMS(counter), 2);
geq->needs_sum[plane] = counter[5] + counter[6] + counter[7] + counter[8] + counter[9];
}
end:
return ret;
}
static int geq_query_formats(AVFilterContext *ctx)
{
GEQContext *geq = ctx->priv;
static const enum AVPixelFormat yuv_pix_fmts[] = {
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV420P9,
AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA420P9,
AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV420P10,
AV_PIX_FMT_YUV440P10,
AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA420P10,
AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10,
AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
AV_PIX_FMT_YUV444P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV420P16,
AV_PIX_FMT_YUVA444P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA420P16,
AV_PIX_FMT_GRAY16,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat rgb_pix_fmts[] = {
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
AV_PIX_FMT_GBRP9,
AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRAP10,
AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRAP12,
AV_PIX_FMT_GBRP14,
AV_PIX_FMT_GBRP16, AV_PIX_FMT_GBRAP16,
AV_PIX_FMT_NONE
};
const enum AVPixelFormat *pix_fmts = geq->is_rgb ? rgb_pix_fmts : yuv_pix_fmts;
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static int geq_config_props(AVFilterLink *inlink)
{
GEQContext *geq = inlink->dst->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
av_assert0(desc);
geq->hsub = desc->log2_chroma_w;
geq->vsub = desc->log2_chroma_h;
geq->bps = desc->comp[0].depth;
geq->planes = desc->nb_components;
return 0;
}
typedef struct ThreadData {
int height;
int width;
int plane;
int linesize;
} ThreadData;
static int slice_geq_filter(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
GEQContext *geq = ctx->priv;
ThreadData *td = arg;
const int height = td->height;
const int width = td->width;
const int plane = td->plane;
const int linesize = td->linesize;
const int slice_start = (height * jobnr) / nb_jobs;
const int slice_end = (height * (jobnr+1)) / nb_jobs;
int x, y;
double values[VAR_VARS_NB];
values[VAR_W] = geq->values[VAR_W];
values[VAR_H] = geq->values[VAR_H];
values[VAR_N] = geq->values[VAR_N];
values[VAR_SW] = geq->values[VAR_SW];
values[VAR_SH] = geq->values[VAR_SH];
values[VAR_T] = geq->values[VAR_T];
if (geq->bps == 8) {
uint8_t *ptr = geq->dst + linesize * slice_start;
for (y = slice_start; y < slice_end; y++) {
values[VAR_Y] = y;
for (x = 0; x < width; x++) {
values[VAR_X] = x;
ptr[x] = av_expr_eval(geq->e[plane][jobnr], values, geq);
}
ptr += linesize;
}
} else {
uint16_t *ptr16 = geq->dst16 + (linesize/2) * slice_start;
for (y = slice_start; y < slice_end; y++) {
values[VAR_Y] = y;
for (x = 0; x < width; x++) {
values[VAR_X] = x;
ptr16[x] = av_expr_eval(geq->e[plane][jobnr], values, geq);
}
ptr16 += linesize/2;
}
}
return 0;
}
static int geq_filter_frame(AVFilterLink *inlink, AVFrame *in)
{
int plane;
AVFilterContext *ctx = inlink->dst;
const int nb_threads = FFMIN(MAX_NB_THREADS, ff_filter_get_nb_threads(ctx));
GEQContext *geq = ctx->priv;
AVFilterLink *outlink = inlink->dst->outputs[0];
AVFrame *out;
geq->values[VAR_N] = inlink->frame_count_out,
geq->values[VAR_T] = in->pts == AV_NOPTS_VALUE ? NAN : in->pts * av_q2d(inlink->time_base),
geq->picref = in;
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 < geq->planes && out->data[plane]; plane++) {
const int width = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->w, geq->hsub) : inlink->w;
const int height = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->h, geq->vsub) : inlink->h;
const int linesize = out->linesize[plane];
ThreadData td;
geq->dst = out->data[plane];
geq->dst16 = (uint16_t*)out->data[plane];
geq->values[VAR_W] = width;
geq->values[VAR_H] = height;
geq->values[VAR_SW] = width / (double)inlink->w;
geq->values[VAR_SH] = height / (double)inlink->h;
td.width = width;
td.height = height;
td.plane = plane;
td.linesize = linesize;
if (geq->needs_sum[plane])
calculate_sums(geq, plane, width, height);
ff_filter_execute(ctx, slice_geq_filter, &td,
NULL, FFMIN(height, nb_threads));
}
av_frame_free(&geq->picref);
return ff_filter_frame(outlink, out);
}
static av_cold void geq_uninit(AVFilterContext *ctx)
{
int i;
GEQContext *geq = ctx->priv;
for (i = 0; i < NB_PLANES; i++)
for (int j = 0; j < MAX_NB_THREADS; j++)
av_expr_free(geq->e[i][j]);
for (i = 0; i < NB_PLANES; i++)
av_freep(&geq->pixel_sums);
}
static const AVFilterPad geq_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = geq_config_props,
.filter_frame = geq_filter_frame,
},
};
static const AVFilterPad geq_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_geq = {
.name = "geq",
.description = NULL_IF_CONFIG_SMALL("Apply generic equation to each pixel."),
.priv_size = sizeof(GEQContext),
.init = geq_init,
.uninit = geq_uninit,
FILTER_INPUTS(geq_inputs),
FILTER_OUTPUTS(geq_outputs),
FILTER_QUERY_FUNC(geq_query_formats),
.priv_class = &geq_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
};
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