| /* |
| * 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 |
| }; |
| AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts); |
| if (!fmts_list) |
| return AVERROR(ENOMEM); |
| return ff_set_common_formats(ctx, fmts_list); |
| } |
| |
| 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, |
| }; |
