/* * 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; int 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; 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 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) { \ 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 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_slice(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; 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_frame(AVFilterLink *inlink, AVFrame *in) { AVFilterContext *ctx = inlink->dst; 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; ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outlink->h, ctx->graph->nb_threads)); if (out != in) 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 ff_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 | AVFILTER_FLAG_SLICE_THREADS, };