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FFmpeg/libavfilter/vf_geq.c
Gyan Doshi b980d9e8ec avfilter/geq: unbreak alpha processing 
d607af50fd broke alpha processing by always overwriting any supplied
alpha expression.
2022-05-08 10:05:19 +05:30

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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
float *dst32; ///< reference pointer to the 32bits 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 && geq->bps <= 16) {
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 if (geq->bps == 32) {
const float *src32 = (const float*)src;
linesize /= 4;
return (1-y)*((1-x)*src32[xi + yi * linesize] + x*src32[xi + 1 + yi * linesize])
+ y *((1-x)*src32[xi + (yi+1) * linesize] + x*src32[xi + 1 + (yi+1) * linesize]);
} else if (geq->bps == 8) {
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 && geq->bps <= 16) {
const uint16_t *src16 = (const uint16_t*)src;
linesize /= 2;
return src16[xi + yi * linesize];
} else if (geq->bps == 32) {
const float *src32 = (const float*)src;
linesize /= 4;
return src32[xi + yi * linesize];
} else if (geq->bps == 8) {
return src[xi + yi * linesize];
}
}
return 0;
}
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 == 32)
linesize /= 4;
else if (geq->bps > 8 && geq->bps <= 16)
linesize /= 2;
for (yi = 0; yi < h; yi ++) {
if (geq->bps > 8 && geq->bps <= 16) {
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 if (geq->bps == 8) {
double linesum = 0;
for (xi = 0; xi < w; xi ++) {
linesum += src[xi + yi * linesize];
geq->pixel_sums[plane][xi + yi * w] = linesum;
}
} else if (geq->bps == 32) {
const float *src32 = (const float*)src;
double linesum = 0;
for (xi = 0; xi < w; xi ++) {
linesum += src32[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->bps != 32) {
geq->expr_str[A] = av_asprintf("%d", (1<<geq->bps) - 1);
} else if (!geq->expr_str[A]) {
geq->expr_str[A] = av_asprintf("%f", 1.f);
}
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_GRAYF32,
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_GBRPF32, AV_PIX_FMT_GBRAPF32,
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 if (geq->bps <= 16) {
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;
}
} else {
float *ptr32 = geq->dst32 + (linesize/4) * slice_start;
for (y = slice_start; y < slice_end; y++) {
values[VAR_Y] = y;
for (x = 0; x < width; x++) {
values[VAR_X] = x;
ptr32[x] = av_expr_eval(geq->e[plane][jobnr], values, geq);
}
ptr32 += linesize/4;
}
}
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->dst32 = (float*)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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