0,0 → 1,552 |
/* |
* 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/intreadwrite.h" |
#include "libavutil/avassert.h" |
#include "libavutil/pixdesc.h" |
#include "avfilter.h" |
#include "drawutils.h" |
#include "formats.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, |
}; |
|
typedef struct { |
const AVClass *class; |
enum preset preset; |
char *comp_points_str[NB_COMP + 1]; |
char *comp_points_str_all; |
uint8_t graph[NB_COMP + 1][256]; |
char *psfile; |
uint8_t rgba_map[4]; |
int step; |
} CurvesContext; |
|
#define OFFSET(x) offsetof(CurvesContext, x) |
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_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}, INT_MIN, INT_MAX, FLAGS, "preset_name" }, |
{ "color_negative", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_COLOR_NEGATIVE}, INT_MIN, INT_MAX, FLAGS, "preset_name" }, |
{ "cross_process", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_CROSS_PROCESS}, INT_MIN, INT_MAX, FLAGS, "preset_name" }, |
{ "darker", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_DARKER}, INT_MIN, INT_MAX, FLAGS, "preset_name" }, |
{ "increase_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_INCREASE_CONTRAST}, INT_MIN, INT_MAX, FLAGS, "preset_name" }, |
{ "lighter", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_LIGHTER}, INT_MIN, INT_MAX, FLAGS, "preset_name" }, |
{ "linear_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_LINEAR_CONTRAST}, INT_MIN, INT_MAX, FLAGS, "preset_name" }, |
{ "medium_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_MEDIUM_CONTRAST}, INT_MIN, INT_MAX, FLAGS, "preset_name" }, |
{ "negative", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_NEGATIVE}, INT_MIN, INT_MAX, FLAGS, "preset_name" }, |
{ "strong_contrast", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_STRONG_CONTRAST}, INT_MIN, INT_MAX, FLAGS, "preset_name" }, |
{ "vintage", NULL, 0, AV_OPT_TYPE_CONST, {.i64=PRESET_VINTAGE}, INT_MIN, INT_MAX, 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 }, |
{ 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] = { |
"0/1 0.129/1 0.466/0.498 0.725/0 1/0", |
"0/1 0.109/1 0.301/0.498 0.517/0 1/0", |
"0/1 0.098/1 0.235/0.498 0.423/0 1/0", |
}, |
[PRESET_CROSS_PROCESS] = { |
"0.25/0.156 0.501/0.501 0.686/0.745", |
"0.25/0.188 0.38/0.501 0.745/0.815 1/0.815", |
"0.231/0.094 0.709/0.874", |
}, |
[PRESET_DARKER] = { .master = "0.5/0.4" }, |
[PRESET_INCREASE_CONTRAST] = { .master = "0.149/0.066 0.831/0.905 0.905/0.98" }, |
[PRESET_LIGHTER] = { .master = "0.4/0.5" }, |
[PRESET_LINEAR_CONTRAST] = { .master = "0.305/0.286 0.694/0.713" }, |
[PRESET_MEDIUM_CONTRAST] = { .master = "0.286/0.219 0.639/0.643" }, |
[PRESET_NEGATIVE] = { .master = "0/1 1/0" }, |
[PRESET_STRONG_CONTRAST] = { .master = "0.301/0.196 0.592/0.6 0.686/0.737" }, |
[PRESET_VINTAGE] = { |
"0/0.11 0.42/0.51 1/0.95", |
"0.50/0.48", |
"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) |
{ |
char *p = (char *)s; // strtod won't alter the string |
struct keypoint *last = NULL; |
|
/* 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 * 255) >= (int)(point->x * 255)) { |
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; |
} |
|
/* auto insert first key point if missing at x=0 */ |
if (!*points) { |
last = make_point(0, 0, NULL); |
if (!last) |
return AVERROR(ENOMEM); |
last->x = last->y = 0; |
*points = last; |
} else if ((*points)->x != 0.) { |
struct keypoint *newfirst = make_point(0, 0, *points); |
if (!newfirst) |
return AVERROR(ENOMEM); |
*points = newfirst; |
} |
|
av_assert0(last); |
|
/* auto insert last key point if missing at x=1 */ |
if (last->x != 1.) { |
struct keypoint *point = make_point(1, 1, NULL); |
if (!point) |
return AVERROR(ENOMEM); |
last->next = point; |
} |
|
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 |
*/ |
static int interpolate(AVFilterContext *ctx, uint8_t *y, const struct keypoint *points) |
{ |
int i, ret = 0; |
const struct keypoint *point; |
double xprev = 0; |
|
int n = get_nb_points(points); // number of splines |
|
double (*matrix)[3] = av_calloc(n, sizeof(*matrix)); |
double *h = av_malloc((n - 1) * sizeof(*h)); |
double *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++) { |
double yp = point->y, |
yc = point->next->y, |
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++) { |
double den = matrix[i][MD] - matrix[i][BD] * matrix[i-1][AD]; |
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]; |
|
/* compute the graph with x=[0..255] */ |
i = 0; |
point = points; |
av_assert0(point->next); // always at least 2 key points |
while (point->next) { |
double yc = point->y; |
double yn = point->next->y; |
|
double a = yc; |
double b = (yn-yc)/h[i] - h[i]*r[i]/2. - h[i]*(r[i+1]-r[i])/6.; |
double c = r[i] / 2.; |
double d = (r[i+1] - r[i]) / (6.*h[i]); |
|
int x; |
int x_start = point->x * 255; |
int x_end = point->next->x * 255; |
|
av_assert0(x_start >= 0 && x_start <= 255 && |
x_end >= 0 && x_end <= 255); |
|
for (x = x_start; x <= x_end; x++) { |
double xx = (x - x_start) * 1/255.; |
double yy = a + b*xx + c*xx*xx + d*xx*xx*xx; |
y[x] = av_clipf(yy, 0, 1) * 255; |
av_log(ctx, AV_LOG_DEBUG, "f(%f)=%f -> y[%d]=%d\n", xx, yy, x, y[x]); |
} |
|
point = point->next; |
i++; |
} |
|
end: |
av_free(matrix); |
av_free(h); |
av_free(r); |
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) \ |
return AVERROR_INVALIDDATA; \ |
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 av_cold int init(AVFilterContext *ctx) |
{ |
int i, j, ret; |
CurvesContext *curves = ctx->priv; |
struct keypoint *comp_points[NB_COMP + 1] = {0}; |
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) { |
ret = parse_psfile(ctx, curves->psfile); |
if (ret < 0) |
return ret; |
} |
|
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); |
} |
|
for (i = 0; i < NB_COMP + 1; i++) { |
ret = parse_points_str(ctx, comp_points + i, curves->comp_points_str[i]); |
if (ret < 0) |
return ret; |
ret = interpolate(ctx, curves->graph[i], comp_points[i]); |
if (ret < 0) |
return ret; |
} |
|
if (pts[NB_COMP]) { |
for (i = 0; i < NB_COMP; i++) |
for (j = 0; j < 256; 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++) { |
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; |
} |
av_log(ctx, AV_LOG_VERBOSE, "\n"); |
av_log(ctx, AV_LOG_VERBOSE, "#%d values:", i); |
for (j = 0; j < 256; j++) |
av_log(ctx, AV_LOG_VERBOSE, " %02X", curves->graph[i][j]); |
av_log(ctx, AV_LOG_VERBOSE, "\n"); |
} |
} |
|
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 query_formats(AVFilterContext *ctx) |
{ |
static const enum AVPixelFormat pix_fmts[] = { |
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_NONE |
}; |
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
return 0; |
} |
|
static int config_input(AVFilterLink *inlink) |
{ |
CurvesContext *curves = inlink->dst->priv; |
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
|
ff_fill_rgba_map(curves->rgba_map, inlink->format); |
curves->step = av_get_padded_bits_per_pixel(desc) >> 3; |
|
return 0; |
} |
|
static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
{ |
int x, y, direct = 0; |
AVFilterContext *ctx = inlink->dst; |
CurvesContext *curves = ctx->priv; |
AVFilterLink *outlink = ctx->outputs[0]; |
AVFrame *out; |
uint8_t *dst; |
const uint8_t *src; |
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]; |
|
if (av_frame_is_writable(in)) { |
direct = 1; |
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); |
} |
|
dst = out->data[0]; |
src = in ->data[0]; |
|
for (y = 0; y < inlink->h; y++) { |
for (x = 0; x < inlink->w * 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]; |
} |
|
if (!direct) |
av_frame_free(&in); |
|
return ff_filter_frame(outlink, out); |
} |
|
static const AVFilterPad curves_inputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
.filter_frame = filter_frame, |
.config_props = config_input, |
}, |
{ NULL } |
}; |
|
static const AVFilterPad curves_outputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
}, |
{ NULL } |
}; |
|
AVFilter avfilter_vf_curves = { |
.name = "curves", |
.description = NULL_IF_CONFIG_SMALL("Adjust components curves."), |
.priv_size = sizeof(CurvesContext), |
.init = init, |
.query_formats = query_formats, |
.inputs = curves_inputs, |
.outputs = curves_outputs, |
.priv_class = &curves_class, |
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
}; |