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FFmpeg/libavfilter/vf_curves.c
Takeshi (Kesh) Ikuma 65f96a965a avfilter/vf_curves: add PCHIP interpolator and interp option 
summary: This patch modifies the `curves` filter with new `interp` option
         to let user pick the existing natural cubic spline interpolation
         and the new PCHIP interapolation.

reason:  The natural cubic spline does not impose monotonicity between
         the keypoints. As such, the fitted curve may vary wildly against
         user's intension. The PCHIP interpolation is not as smooth as
         the natural spline but guarantees the monotonicity. Providing
         both options enhances users experience (e.g., reduces the number
         of keypoints to realize the desired curve). See the related bug
         report for the example of an ill-interpolated curve.

alternate solution:
         Both Photoshop and GIMP appear to use monotonic interpolation in
         their curve tools, which were the models for this filter. As
         such, an alternate solution is to drop the natural spline and
         go without the `interp` option.

related bug report: https://trac.ffmpeg.org/ticket/9947 (filed by myself)

Signed-off-by: Takeshi (Kesh) Ikuma <tikuma@hotmail.com>
2022-10-22 19:35:44 +02:00

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/*
* Copyright (c) 2013 Clément Bœsch
*
* 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
*/
#include "libavutil/opt.h"
#include "libavutil/bprint.h"
#include "libavutil/eval.h"
#include "libavutil/file.h"
#include "libavutil/file_open.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/avassert.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "drawutils.h"
#include "internal.h"
#include "video.h"
#define R 0
#define G 1
#define B 2
#define A 3
struct keypoint {
double x, y;
struct keypoint *next;
};
#define NB_COMP 3
enum preset {
PRESET_NONE,
PRESET_COLOR_NEGATIVE,
PRESET_CROSS_PROCESS,
PRESET_DARKER,
PRESET_INCREASE_CONTRAST,
PRESET_LIGHTER,
PRESET_LINEAR_CONTRAST,
PRESET_MEDIUM_CONTRAST,
PRESET_NEGATIVE,
PRESET_STRONG_CONTRAST,
PRESET_VINTAGE,
NB_PRESETS,
};
enum interp {
INTERP_NATURAL,
INTERP_PCHIP,
NB_INTERPS,
};
typedef struct CurvesContext {
const AVClass *class;
int preset;
char *comp_points_str[NB_COMP + 1];
char *comp_points_str_all;
uint16_t *graph[NB_COMP + 1];
int lut_size;
char *psfile;
uint8_t rgba_map[4];
int step;
char *plot_filename;
int saved_plot;
int is_16bit;
int depth;
int parsed_psfile;
int interp;
int (*filter_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
} CurvesContext;
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
#define OFFSET(x) offsetof(CurvesContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption curves_options[] = {
{ "preset", "select a color curves preset", OFFSET(preset), AV_OPT_TYPE_INT, {.i64=PRESET_NONE}, PRESET_NONE, NB_PRESETS-1, FLAGS, "preset_name" },
{ "none", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NONE}, 0, 0, FLAGS, "preset_name" },
{ "color_negative", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_COLOR_NEGATIVE}, 0, 0, FLAGS, "preset_name" },
{ "cross_process", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_CROSS_PROCESS}, 0, 0, FLAGS, "preset_name" },
{ "darker", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_DARKER}, 0, 0, FLAGS, "preset_name" },
{ "increase_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_INCREASE_CONTRAST}, 0, 0, FLAGS, "preset_name" },
{ "lighter", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_LIGHTER}, 0, 0, FLAGS, "preset_name" },
{ "linear_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_LINEAR_CONTRAST}, 0, 0, FLAGS, "preset_name" },
{ "medium_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_MEDIUM_CONTRAST}, 0, 0, FLAGS, "preset_name" },
{ "negative", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NEGATIVE}, 0, 0, FLAGS, "preset_name" },
{ "strong_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_STRONG_CONTRAST}, 0, 0, FLAGS, "preset_name" },
{ "vintage", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_VINTAGE}, 0, 0, FLAGS, "preset_name" },
{ "master","set master points coordinates",OFFSET(comp_points_str[NB_COMP]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "m", "set master points coordinates",OFFSET(comp_points_str[NB_COMP]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "red", "set red points coordinates", OFFSET(comp_points_str[0]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "r", "set red points coordinates", OFFSET(comp_points_str[0]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "green", "set green points coordinates", OFFSET(comp_points_str[1]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "g", "set green points coordinates", OFFSET(comp_points_str[1]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "blue", "set blue points coordinates", OFFSET(comp_points_str[2]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "b", "set blue points coordinates", OFFSET(comp_points_str[2]), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "all", "set points coordinates for all components", OFFSET(comp_points_str_all), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "psfile", "set Photoshop curves file name", OFFSET(psfile), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "plot", "save Gnuplot script of the curves in specified file", OFFSET(plot_filename), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
{ "interp", "specify the kind of interpolation", OFFSET(interp), AV_OPT_TYPE_INT, {.i64=INTERP_NATURAL}, INTERP_NATURAL, NB_INTERPS-1, FLAGS, "interp_name" },
{ "natural", "natural cubic spline", 0, AV_OPT_TYPE_CONST, {.i64=INTERP_NATURAL}, 0, 0, FLAGS, "interp_name" },
{ "pchip", "monotonically cubic interpolation", 0, AV_OPT_TYPE_CONST, {.i64=INTERP_PCHIP}, 0, 0, FLAGS, "interp_name" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(curves);
static const struct {
const char *r;
const char *g;
const char *b;
const char *master;
} curves_presets[] = {
[PRESET_COLOR_NEGATIVE] = {
"0.129/1 0.466/0.498 0.725/0",
"0.109/1 0.301/0.498 0.517/0",
"0.098/1 0.235/0.498 0.423/0",
},
[PRESET_CROSS_PROCESS] = {
"0/0 0.25/0.156 0.501/0.501 0.686/0.745 1/1",
"0/0 0.25/0.188 0.38/0.501 0.745/0.815 1/0.815",
"0/0 0.231/0.094 0.709/0.874 1/1",
},
[PRESET_DARKER] = { .master = "0/0 0.5/0.4 1/1" },
[PRESET_INCREASE_CONTRAST] = { .master = "0/0 0.149/0.066 0.831/0.905 0.905/0.98 1/1" },
[PRESET_LIGHTER] = { .master = "0/0 0.4/0.5 1/1" },
[PRESET_LINEAR_CONTRAST] = { .master = "0/0 0.305/0.286 0.694/0.713 1/1" },
[PRESET_MEDIUM_CONTRAST] = { .master = "0/0 0.286/0.219 0.639/0.643 1/1" },
[PRESET_NEGATIVE] = { .master = "0/1 1/0" },
[PRESET_STRONG_CONTRAST] = { .master = "0/0 0.301/0.196 0.592/0.6 0.686/0.737 1/1" },
[PRESET_VINTAGE] = {
"0/0.11 0.42/0.51 1/0.95",
"0/0 0.50/0.48 1/1",
"0/0.22 0.49/0.44 1/0.8",
}
};
static struct keypoint *make_point(double x, double y, struct keypoint *next)
{
struct keypoint *point = av_mallocz(sizeof(*point));
if (!point)
return NULL;
point->x = x;
point->y = y;
point->next = next;
return point;
}
static int parse_points_str(AVFilterContext *ctx, struct keypoint **points, const char *s,
int lut_size)
{
char *p = (char *)s; // strtod won't alter the string
struct keypoint *last = NULL;
const int scale = lut_size - 1;
/* construct a linked list based on the key points string */
while (p && *p) {
struct keypoint *point = make_point(0, 0, NULL);
if (!point)
return AVERROR(ENOMEM);
point->x = av_strtod(p, &p); if (p && *p) p++;
point->y = av_strtod(p, &p); if (p && *p) p++;
if (point->x < 0 || point->x > 1 || point->y < 0 || point->y > 1) {
av_log(ctx, AV_LOG_ERROR, "Invalid key point coordinates (%f;%f), "
"x and y must be in the [0;1] range.\n", point->x, point->y);
return AVERROR(EINVAL);
}
if (!*points)
*points = point;
if (last) {
if ((int)(last->x * scale) >= (int)(point->x * scale)) {
av_log(ctx, AV_LOG_ERROR, "Key point coordinates (%f;%f) "
"and (%f;%f) are too close from each other or not "
"strictly increasing on the x-axis\n",
last->x, last->y, point->x, point->y);
return AVERROR(EINVAL);
}
last->next = point;
}
last = point;
}
if (*points && !(*points)->next) {
av_log(ctx, AV_LOG_WARNING, "Only one point (at (%f;%f)) is defined, "
"this is unlikely to behave as you expect. You probably want"
"at least 2 points.",
(*points)->x, (*points)->y);
}
return 0;
}
static int get_nb_points(const struct keypoint *d)
{
int n = 0;
while (d) {
n++;
d = d->next;
}
return n;
}
/**
* Natural cubic spline interpolation
* Finding curves using Cubic Splines notes by Steven Rauch and John Stockie.
* @see http://people.math.sfu.ca/~stockie/teaching/macm316/notes/splines.pdf
*/
#define CLIP(v) (nbits == 8 ? av_clip_uint8(v) : av_clip_uintp2_c(v, nbits))
static inline int interpolate(void *log_ctx, uint16_t *y,
const struct keypoint *points, int nbits)
{
int i, ret = 0;
const struct keypoint *point = points;
double xprev = 0;
const int lut_size = 1<<nbits;
const int scale = lut_size - 1;
double (*matrix)[3];
double *h, *r;
const int n = get_nb_points(points); // number of splines
if (n == 0) {
for (i = 0; i < lut_size; i++)
y[i] = i;
return 0;
}
if (n == 1) {
for (i = 0; i < lut_size; i++)
y[i] = CLIP(point->y * scale);
return 0;
}
matrix = av_calloc(n, sizeof(*matrix));
h = av_malloc((n - 1) * sizeof(*h));
r = av_calloc(n, sizeof(*r));
if (!matrix || !h || !r) {
ret = AVERROR(ENOMEM);
goto end;
}
/* h(i) = x(i+1) - x(i) */
i = -1;
for (point = points; point; point = point->next) {
if (i != -1)
h[i] = point->x - xprev;
xprev = point->x;
i++;
}
/* right-side of the polynomials, will be modified to contains the solution */
point = points;
for (i = 1; i < n - 1; i++) {
const double yp = point->y;
const double yc = point->next->y;
const double yn = point->next->next->y;
r[i] = 6 * ((yn-yc)/h[i] - (yc-yp)/h[i-1]);
point = point->next;
}
#define BD 0 /* sub diagonal (below main) */
#define MD 1 /* main diagonal (center) */
#define AD 2 /* sup diagonal (above main) */
/* left side of the polynomials into a tridiagonal matrix. */
matrix[0][MD] = matrix[n - 1][MD] = 1;
for (i = 1; i < n - 1; i++) {
matrix[i][BD] = h[i-1];
matrix[i][MD] = 2 * (h[i-1] + h[i]);
matrix[i][AD] = h[i];
}
/* tridiagonal solving of the linear system */
for (i = 1; i < n; i++) {
const double den = matrix[i][MD] - matrix[i][BD] * matrix[i-1][AD];
const double k = den ? 1./den : 1.;
matrix[i][AD] *= k;
r[i] = (r[i] - matrix[i][BD] * r[i - 1]) * k;
}
for (i = n - 2; i >= 0; i--)
r[i] = r[i] - matrix[i][AD] * r[i + 1];
point = points;
/* left padding */
for (i = 0; i < (int)(point->x * scale); i++)
y[i] = CLIP(point->y * scale);
/* compute the graph with x=[x0..xN] */
i = 0;
av_assert0(point->next); // always at least 2 key points
while (point->next) {
const double yc = point->y;
const double yn = point->next->y;
const double a = yc;
const double b = (yn-yc)/h[i] - h[i]*r[i]/2. - h[i]*(r[i+1]-r[i])/6.;
const double c = r[i] / 2.;
const double d = (r[i+1] - r[i]) / (6.*h[i]);
int x;
const int x_start = point->x * scale;
const int x_end = point->next->x * scale;
av_assert0(x_start >= 0 && x_start < lut_size &&
x_end >= 0 && x_end < lut_size);
for (x = x_start; x <= x_end; x++) {
const double xx = (x - x_start) * 1./scale;
const double yy = a + b*xx + c*xx*xx + d*xx*xx*xx;
y[x] = CLIP(yy * scale);
av_log(log_ctx, AV_LOG_DEBUG, "f(%f)=%f -> y[%d]=%d\n", xx, yy, x, y[x]);
}
point = point->next;
i++;
}
/* right padding */
for (i = (int)(point->x * scale); i < lut_size; i++)
y[i] = CLIP(point->y * scale);
end:
av_free(matrix);
av_free(h);
av_free(r);
return ret;
}
#define SIGN(x) (x > 0.0 ? 1 : x < 0.0 ? -1 : 0)
/**
* Evalaute the derivative of an edge endpoint
*
* @param h0 input interval of the interval closest to the edge
* @param h1 input interval of the interval next to the closest
* @param m0 linear slope of the interval closest to the edge
* @param m1 linear slope of the intervalnext to the closest
* @return edge endpoint derivative
*
* Based on scipy.interpolate._edge_case()
* https://github.com/scipy/scipy/blob/2e5883ef7af4f5ed4a5b80a1759a45e43163bf3f/scipy/interpolate/_cubic.py#L239
* which is a python implementation of the special case endpoints, as suggested in
* Cleve Moler, Numerical Computing with MATLAB, Chap 3.6 (pchiptx.m)
*/
static double pchip_edge_case(double h0, double h1, double m0, double m1)
{
int mask, mask2;
double d;
d = ((2 * h0 + h1) * m0 - h0 * m1) / (h0 + h1);
mask = SIGN(d) != SIGN(m0);
mask2 = (SIGN(m0) != SIGN(m1)) && (fabs(d) > 3. * fabs(m0));
if (mask) d = 0.0;
else if (mask2) d = 3.0 * m0;
return d;
}
/**
* Evalaute the piecewise polynomial derivatives at endpoints
*
* @param n input interval of the interval closest to the edge
* @param hk input intervals
* @param mk linear slopes over intervals
* @param dk endpoint derivatives (output)
* @return 0 success
*
* Based on scipy.interpolate._find_derivatives()
* https://github.com/scipy/scipy/blob/2e5883ef7af4f5ed4a5b80a1759a45e43163bf3f/scipy/interpolate/_cubic.py#L254
*/
static int pchip_find_derivatives(const int n, const double *hk, const double *mk, double *dk)
{
int ret = 0;
const int m = n - 1;
int8_t *smk;
smk = av_malloc(n);
if (!smk) {
ret = AVERROR(ENOMEM);
goto end;
}
/* smk = sgn(mk) */
for (int i = 0; i < n; i++) smk[i] = SIGN(mk[i]);
/* check the strict monotonicity */
for (int i = 0; i < m; i++) {
int8_t condition = (smk[i + 1] != smk[i]) || (mk[i + 1] == 0) || (mk[i] == 0);
if (condition) {
dk[i + 1] = 0.0;
} else {
double w1 = 2 * hk[i + 1] + hk[i];
double w2 = hk[i + 1] + 2 * hk[i];
dk[i + 1] = (w1 + w2) / (w1 / mk[i] + w2 / mk[i + 1]);
}
}
dk[0] = pchip_edge_case(hk[0], hk[1], mk[0], mk[1]);
dk[n] = pchip_edge_case(hk[n - 1], hk[n - 2], mk[n - 1], mk[n - 2]);
end:
av_free(smk);
return ret;
}
/**
* Evalaute half of the cubic hermite interpolation expression, wrt one interval endpoint
*
* @param x normalized input value at the endpoint
* @param f output value at the endpoint
* @param d derivative at the endpoint: normalized to the interval, and properly sign adjusted
* @return half of the interpolated value
*/
static inline double interp_cubic_hermite_half(const double x, const double f,
const double d)
{
double x2 = x * x, x3 = x2 * x;
return f * (3.0 * x2 - 2.0 * x3) + d * (x3 - x2);
}
/**
* Prepare the lookup table by piecewise monotonic cubic interpolation (PCHIP)
*
* @param log_ctx for logging
* @param y output lookup table (output)
* @param points user-defined control points/endpoints
* @param nbits bitdepth
* @return 0 success
*
* References:
* [1] F. N. Fritsch and J. Butland, A method for constructing local monotone piecewise
* cubic interpolants, SIAM J. Sci. Comput., 5(2), 300-304 (1984). DOI:10.1137/0905021.
* [2] scipy.interpolate: https://docs.scipy.org/doc/scipy/reference/generated/scipy.interpolate.PchipInterpolator.html
*/
static inline int interpolate_pchip(void *log_ctx, uint16_t *y,
const struct keypoint *points, int nbits)
{
const struct keypoint *point = points;
const int lut_size = 1<<nbits;
const int n = get_nb_points(points); // number of endpoints
double *xi, *fi, *di, *hi, *mi;
const int scale = lut_size - 1; // white value
uint16_t x; /* input index/value */
int ret = 0;
/* no change for n = 0 or 1 */
if (n == 0) {
/* no points, no change */
for (int i = 0; i < lut_size; i++) y[i] = i;
return 0;
}
if (n == 1) {
/* 1 point - 1 color everywhere */
const uint16_t yval = CLIP(point->y * scale);
for (int i = 0; i < lut_size; i++) y[i] = yval;
return 0;
}
xi = av_calloc(3*n + 2*(n-1), sizeof(double)); /* output values at interval endpoints */
if (!xi) {
ret = AVERROR(ENOMEM);
goto end;
}
fi = xi + n; /* output values at inteval endpoints */
di = fi + n; /* output slope wrt normalized input at interval endpoints */
hi = di + n; /* interval widths */
mi = hi + n - 1; /* linear slope over intervals */
/* scale endpoints and store them in a contiguous memory block */
for (int i = 0; i < n; i++) {
xi[i] = point->x * scale;
fi[i] = point->y * scale;
point = point->next;
}
/* h(i) = x(i+1) - x(i); mi(i) = (f(i+1)-f(i))/h(i) */
for (int i = 0; i < n - 1; i++) {
const double val = (xi[i+1]-xi[i]);
hi[i] = val;
mi[i] = (fi[i+1]-fi[i]) / val;
}
if (n == 2) {
/* edge case, use linear interpolation */
const double m = mi[0], b = fi[0] - xi[0]*m;
for (int i = 0; i < lut_size; i++) y[i] = CLIP(i*m + b);
goto end;
}
/* compute the derivatives at the endpoints*/
ret = pchip_find_derivatives(n-1, hi, mi, di);
if (ret)
goto end;
/* interpolate/extrapolate */
x = 0;
if (xi[0] > 0) {
/* below first endpoint, use the first endpoint value*/
const double xi0 = xi[0];
const double yi0 = fi[0];
const uint16_t yval = CLIP(yi0);
for (; x < xi0; x++) {
y[x] = yval;
av_log(log_ctx, AV_LOG_TRACE, "f(%f)=%f -> y[%d]=%d\n", xi0, yi0, x, y[x]);
}
av_log(log_ctx, AV_LOG_DEBUG, "Interval -1: [0, %d] -> %d\n", x - 1, yval);
}
/* for each interval */
for (int i = 0, x0 = x; i < n-1; i++, x0 = x) {
const double xi0 = xi[i]; /* start-of-interval input value */
const double xi1 = xi[i + 1]; /* end-of-interval input value */
const double h = hi[i]; /* interval width */
const double f0 = fi[i]; /* start-of-interval output value */
const double f1 = fi[i + 1]; /* end-of-interval output value */
const double d0 = di[i]; /* start-of-interval derivative */
const double d1 = di[i + 1]; /* end-of-interval derivative */
/* fill the lut over the interval */
for (; x < xi1; x++) { /* safe not to check j < lut_size */
const double xx = (x - xi0) / h; /* normalize input */
const double yy = interp_cubic_hermite_half(1 - xx, f0, -h * d0)
+ interp_cubic_hermite_half(xx, f1, h * d1);
y[x] = CLIP(yy);
av_log(log_ctx, AV_LOG_TRACE, "f(%f)=%f -> y[%d]=%d\n", xx, yy, x, y[x]);
}
if (x > x0)
av_log(log_ctx, AV_LOG_DEBUG, "Interval %d: [%d, %d] -> [%d, %d]\n",
i, x0, x-1, y[x0], y[x-1]);
else
av_log(log_ctx, AV_LOG_DEBUG, "Interval %d: empty\n", i);
}
if (x && x < lut_size) {
/* above the last endpoint, use the last endpoint value*/
const double xi1 = xi[n - 1];
const double yi1 = fi[n - 1];
const uint16_t yval = CLIP(yi1);
av_log(log_ctx, AV_LOG_DEBUG, "Interval %d: [%d, %d] -> %d\n",
n-1, x, lut_size - 1, yval);
for (; x && x < lut_size; x++) { /* loop until int overflow */
y[x] = yval;
av_log(log_ctx, AV_LOG_TRACE, "f(%f)=%f -> y[%d]=%d\n", xi1, yi1, x, yval);
}
}
end:
av_free(xi);
return ret;
}
static int parse_psfile(AVFilterContext *ctx, const char *fname)
{
CurvesContext *curves = ctx->priv;
uint8_t *buf;
size_t size;
int i, ret, av_unused(version), nb_curves;
AVBPrint ptstr;
static const int comp_ids[] = {3, 0, 1, 2};
av_bprint_init(&ptstr, 0, AV_BPRINT_SIZE_AUTOMATIC);
ret = av_file_map(fname, &buf, &size, 0, NULL);
if (ret < 0)
return ret;
#define READ16(dst) do { \
if (size < 2) { \
ret = AVERROR_INVALIDDATA; \
goto end; \
} \
dst = AV_RB16(buf); \
buf += 2; \
size -= 2; \
} while (0)
READ16(version);
READ16(nb_curves);
for (i = 0; i < FFMIN(nb_curves, FF_ARRAY_ELEMS(comp_ids)); i++) {
int nb_points, n;
av_bprint_clear(&ptstr);
READ16(nb_points);
for (n = 0; n < nb_points; n++) {
int y, x;
READ16(y);
READ16(x);
av_bprintf(&ptstr, "%f/%f ", x / 255., y / 255.);
}
if (*ptstr.str) {
char **pts = &curves->comp_points_str[comp_ids[i]];
if (!*pts) {
*pts = av_strdup(ptstr.str);
av_log(ctx, AV_LOG_DEBUG, "curves %d (intid=%d) [%d points]: [%s]\n",
i, comp_ids[i], nb_points, *pts);
if (!*pts) {
ret = AVERROR(ENOMEM);
goto end;
}
}
}
}
end:
av_bprint_finalize(&ptstr, NULL);
av_file_unmap(buf, size);
return ret;
}
static int dump_curves(const char *fname, uint16_t *graph[NB_COMP + 1],
struct keypoint *comp_points[NB_COMP + 1],
int lut_size)
{
int i;
AVBPrint buf;
const double scale = 1. / (lut_size - 1);
static const char * const colors[] = { "red", "green", "blue", "#404040", };
FILE *f = avpriv_fopen_utf8(fname, "w");
av_assert0(FF_ARRAY_ELEMS(colors) == NB_COMP + 1);
if (!f) {
int ret = AVERROR(errno);
av_log(NULL, AV_LOG_ERROR, "Cannot open file '%s' for writing: %s\n",
fname, av_err2str(ret));
return ret;
}
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
av_bprintf(&buf, "set xtics 0.1\n");
av_bprintf(&buf, "set ytics 0.1\n");
av_bprintf(&buf, "set size square\n");
av_bprintf(&buf, "set grid\n");
for (i = 0; i < FF_ARRAY_ELEMS(colors); i++) {
av_bprintf(&buf, "%s'-' using 1:2 with lines lc '%s' title ''",
i ? ", " : "plot ", colors[i]);
if (comp_points[i])
av_bprintf(&buf, ", '-' using 1:2 with points pointtype 3 lc '%s' title ''",
colors[i]);
}
av_bprintf(&buf, "\n");
for (i = 0; i < FF_ARRAY_ELEMS(colors); i++) {
int x;
/* plot generated values */
for (x = 0; x < lut_size; x++)
av_bprintf(&buf, "%f %f\n", x * scale, graph[i][x] * scale);
av_bprintf(&buf, "e\n");
/* plot user knots */
if (comp_points[i]) {
const struct keypoint *point = comp_points[i];
while (point) {
av_bprintf(&buf, "%f %f\n", point->x, point->y);
point = point->next;
}
av_bprintf(&buf, "e\n");
}
}
fwrite(buf.str, 1, buf.len, f);
fclose(f);
av_bprint_finalize(&buf, NULL);
return 0;
}
static av_cold int curves_init(AVFilterContext *ctx)
{
int i, ret;
CurvesContext *curves = ctx->priv;
char **pts = curves->comp_points_str;
const char *allp = curves->comp_points_str_all;
//if (!allp && curves->preset != PRESET_NONE && curves_presets[curves->preset].all)
// allp = curves_presets[curves->preset].all;
if (allp) {
for (i = 0; i < NB_COMP; i++) {
if (!pts[i])
pts[i] = av_strdup(allp);
if (!pts[i])
return AVERROR(ENOMEM);
}
}
if (curves->psfile && !curves->parsed_psfile) {
ret = parse_psfile(ctx, curves->psfile);
if (ret < 0)
return ret;
curves->parsed_psfile = 1;
}
if (curves->preset != PRESET_NONE) {
#define SET_COMP_IF_NOT_SET(n, name) do { \
if (!pts[n] && curves_presets[curves->preset].name) { \
pts[n] = av_strdup(curves_presets[curves->preset].name); \
if (!pts[n]) \
return AVERROR(ENOMEM); \
} \
} while (0)
SET_COMP_IF_NOT_SET(0, r);
SET_COMP_IF_NOT_SET(1, g);
SET_COMP_IF_NOT_SET(2, b);
SET_COMP_IF_NOT_SET(3, master);
curves->preset = PRESET_NONE;
}
return 0;
}
static int filter_slice_packed(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
int x, y;
const CurvesContext *curves = ctx->priv;
const ThreadData *td = arg;
const AVFrame *in = td->in;
const AVFrame *out = td->out;
const int direct = out == in;
const int step = curves->step;
const uint8_t r = curves->rgba_map[R];
const uint8_t g = curves->rgba_map[G];
const uint8_t b = curves->rgba_map[B];
const uint8_t a = curves->rgba_map[A];
const int slice_start = (in->height * jobnr ) / nb_jobs;
const int slice_end = (in->height * (jobnr+1)) / nb_jobs;
if (curves->is_16bit) {
for (y = slice_start; y < slice_end; y++) {
uint16_t *dstp = ( uint16_t *)(out->data[0] + y * out->linesize[0]);
const uint16_t *srcp = (const uint16_t *)(in ->data[0] + y * in->linesize[0]);
for (x = 0; x < in->width * step; x += step) {
dstp[x + r] = curves->graph[R][srcp[x + r]];
dstp[x + g] = curves->graph[G][srcp[x + g]];
dstp[x + b] = curves->graph[B][srcp[x + b]];
if (!direct && step == 4)
dstp[x + a] = srcp[x + a];
}
}
} else {
uint8_t *dst = out->data[0] + slice_start * out->linesize[0];
const uint8_t *src = in->data[0] + slice_start * in->linesize[0];
for (y = slice_start; y < slice_end; y++) {
for (x = 0; x < in->width * step; x += step) {
dst[x + r] = curves->graph[R][src[x + r]];
dst[x + g] = curves->graph[G][src[x + g]];
dst[x + b] = curves->graph[B][src[x + b]];
if (!direct && step == 4)
dst[x + a] = src[x + a];
}
dst += out->linesize[0];
src += in ->linesize[0];
}
}
return 0;
}
static int filter_slice_planar(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
int x, y;
const CurvesContext *curves = ctx->priv;
const ThreadData *td = arg;
const AVFrame *in = td->in;
const AVFrame *out = td->out;
const int direct = out == in;
const int step = curves->step;
const uint8_t r = curves->rgba_map[R];
const uint8_t g = curves->rgba_map[G];
const uint8_t b = curves->rgba_map[B];
const uint8_t a = curves->rgba_map[A];
const int slice_start = (in->height * jobnr ) / nb_jobs;
const int slice_end = (in->height * (jobnr+1)) / nb_jobs;
if (curves->is_16bit) {
for (y = slice_start; y < slice_end; y++) {
uint16_t *dstrp = ( uint16_t *)(out->data[r] + y * out->linesize[r]);
uint16_t *dstgp = ( uint16_t *)(out->data[g] + y * out->linesize[g]);
uint16_t *dstbp = ( uint16_t *)(out->data[b] + y * out->linesize[b]);
uint16_t *dstap = ( uint16_t *)(out->data[a] + y * out->linesize[a]);
const uint16_t *srcrp = (const uint16_t *)(in ->data[r] + y * in->linesize[r]);
const uint16_t *srcgp = (const uint16_t *)(in ->data[g] + y * in->linesize[g]);
const uint16_t *srcbp = (const uint16_t *)(in ->data[b] + y * in->linesize[b]);
const uint16_t *srcap = (const uint16_t *)(in ->data[a] + y * in->linesize[a]);
for (x = 0; x < in->width; x++) {
dstrp[x] = curves->graph[R][srcrp[x]];
dstgp[x] = curves->graph[G][srcgp[x]];
dstbp[x] = curves->graph[B][srcbp[x]];
if (!direct && step == 4)
dstap[x] = srcap[x];
}
}
} else {
uint8_t *dstr = out->data[r] + slice_start * out->linesize[r];
uint8_t *dstg = out->data[g] + slice_start * out->linesize[g];
uint8_t *dstb = out->data[b] + slice_start * out->linesize[b];
uint8_t *dsta = out->data[a] + slice_start * out->linesize[a];
const uint8_t *srcr = in->data[r] + slice_start * in->linesize[r];
const uint8_t *srcg = in->data[g] + slice_start * in->linesize[g];
const uint8_t *srcb = in->data[b] + slice_start * in->linesize[b];
const uint8_t *srca = in->data[a] + slice_start * in->linesize[a];
for (y = slice_start; y < slice_end; y++) {
for (x = 0; x < in->width; x++) {
dstr[x] = curves->graph[R][srcr[x]];
dstg[x] = curves->graph[G][srcg[x]];
dstb[x] = curves->graph[B][srcb[x]];
if (!direct && step == 4)
dsta[x] = srca[x];
}
dstr += out->linesize[r];
dstg += out->linesize[g];
dstb += out->linesize[b];
dsta += out->linesize[a];
srcr += in ->linesize[r];
srcg += in ->linesize[g];
srcb += in ->linesize[b];
srca += in ->linesize[a];
}
}
return 0;
}
static int config_input(AVFilterLink *inlink)
{
int i, j, ret;
AVFilterContext *ctx = inlink->dst;
CurvesContext *curves = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
char **pts = curves->comp_points_str;
struct keypoint *comp_points[NB_COMP + 1] = {0};
ff_fill_rgba_map(curves->rgba_map, inlink->format);
curves->is_16bit = desc->comp[0].depth > 8;
curves->depth = desc->comp[0].depth;
curves->lut_size = 1 << curves->depth;
curves->step = av_get_padded_bits_per_pixel(desc) >> (3 + curves->is_16bit);
curves->filter_slice = desc->flags & AV_PIX_FMT_FLAG_PLANAR ? filter_slice_planar : filter_slice_packed;
for (i = 0; i < NB_COMP + 1; i++) {
if (!curves->graph[i])
curves->graph[i] = av_calloc(curves->lut_size, sizeof(*curves->graph[0]));
if (!curves->graph[i])
return AVERROR(ENOMEM);
ret = parse_points_str(ctx, comp_points + i, curves->comp_points_str[i], curves->lut_size);
if (ret < 0)
return ret;
if (curves->interp == INTERP_PCHIP)
ret = interpolate_pchip(ctx, curves->graph[i], comp_points[i], curves->depth);
else
ret = interpolate(ctx, curves->graph[i], comp_points[i], curves->depth);
if (ret < 0)
return ret;
}
if (pts[NB_COMP]) {
for (i = 0; i < NB_COMP; i++)
for (j = 0; j < curves->lut_size; j++)
curves->graph[i][j] = curves->graph[NB_COMP][curves->graph[i][j]];
}
if (av_log_get_level() >= AV_LOG_VERBOSE) {
for (i = 0; i < NB_COMP; i++) {
const struct keypoint *point = comp_points[i];
av_log(ctx, AV_LOG_VERBOSE, "#%d points:", i);
while (point) {
av_log(ctx, AV_LOG_VERBOSE, " (%f;%f)", point->x, point->y);
point = point->next;
}
}
}
if (curves->plot_filename && !curves->saved_plot) {
dump_curves(curves->plot_filename, curves->graph, comp_points, curves->lut_size);
curves->saved_plot = 1;
}
for (i = 0; i < NB_COMP + 1; i++) {
struct keypoint *point = comp_points[i];
while (point) {
struct keypoint *next = point->next;
av_free(point);
point = next;
}
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
CurvesContext *curves = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
ThreadData td;
if (av_frame_is_writable(in)) {
out = in;
} else {
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);
}
td.in = in;
td.out = out;
ff_filter_execute(ctx, curves->filter_slice, &td, NULL,
FFMIN(outlink->h, ff_filter_get_nb_threads(ctx)));
if (out != in)
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
CurvesContext *curves = ctx->priv;
int ret;
if (!strcmp(cmd, "plot")) {
curves->saved_plot = 0;
} else if (!strcmp(cmd, "all") || !strcmp(cmd, "preset") || !strcmp(cmd, "psfile") || !strcmp(cmd, "interp")) {
if (!strcmp(cmd, "psfile"))
curves->parsed_psfile = 0;
av_freep(&curves->comp_points_str_all);
av_freep(&curves->comp_points_str[0]);
av_freep(&curves->comp_points_str[1]);
av_freep(&curves->comp_points_str[2]);
av_freep(&curves->comp_points_str[NB_COMP]);
} else if (!strcmp(cmd, "red") || !strcmp(cmd, "r")) {
av_freep(&curves->comp_points_str[0]);
} else if (!strcmp(cmd, "green") || !strcmp(cmd, "g")) {
av_freep(&curves->comp_points_str[1]);
} else if (!strcmp(cmd, "blue") || !strcmp(cmd, "b")) {
av_freep(&curves->comp_points_str[2]);
} else if (!strcmp(cmd, "master") || !strcmp(cmd, "m")) {
av_freep(&curves->comp_points_str[NB_COMP]);
}
ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
if (ret < 0)
return ret;
ret = curves_init(ctx);
if (ret < 0)
return ret;
return config_input(ctx->inputs[0]);
}
static av_cold void curves_uninit(AVFilterContext *ctx)
{
int i;
CurvesContext *curves = ctx->priv;
for (i = 0; i < NB_COMP + 1; i++)
av_freep(&curves->graph[i]);
}
static const AVFilterPad curves_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
static const AVFilterPad curves_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
const AVFilter ff_vf_curves = {
.name = "curves",
.description = NULL_IF_CONFIG_SMALL("Adjust components curves."),
.priv_size = sizeof(CurvesContext),
.init = curves_init,
.uninit = curves_uninit,
FILTER_INPUTS(curves_inputs),
FILTER_OUTPUTS(curves_outputs),
FILTER_PIXFMTS(AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA,
AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
AV_PIX_FMT_0RGB, AV_PIX_FMT_0BGR,
AV_PIX_FMT_RGB0, AV_PIX_FMT_BGR0,
AV_PIX_FMT_RGB48, AV_PIX_FMT_BGR48,
AV_PIX_FMT_RGBA64, AV_PIX_FMT_BGRA64,
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),
.priv_class = &curves_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
.process_command = process_command,
};
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