diff options
Diffstat (limited to 'libavfilter/vf_curves.c')
| -rw-r--r-- | libavfilter/vf_curves.c | 696 |
1 files changed, 696 insertions, 0 deletions
diff --git a/libavfilter/vf_curves.c b/libavfilter/vf_curves.c new file mode 100644 index 0000000000..19ab789152 --- /dev/null +++ b/libavfilter/vf_curves.c @@ -0,0 +1,696 @@ +/* + * 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 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 is_16bit; +} 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 }, + { "plot", "save Gnuplot script of the curves in specified file", OFFSET(plot_filename), 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] = { + "0.129/1 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_uint16(v)) + +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 DECLARE_INTERPOLATE_FUNC(nbits) \ +static int interpolate##nbits(void *log_ctx, uint16_t *y, \ + const struct keypoint *points) \ +{ \ + return interpolate(log_ctx, y, points, nbits); \ +} + +DECLARE_INTERPOLATE_FUNC(8) +DECLARE_INTERPOLATE_FUNC(16) + +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 = av_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) { + 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); + } + + 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_RGB48, AV_PIX_FMT_BGR48, + AV_PIX_FMT_RGBA64, AV_PIX_FMT_BGRA64, + 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) +{ + 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->lut_size = curves->is_16bit ? 1<<16 : 1<<8; + curves->step = av_get_padded_bits_per_pixel(desc) >> (3 + curves->is_16bit); + + for (i = 0; i < NB_COMP + 1; i++) { + curves->graph[i] = av_mallocz_array(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->is_16bit) ret = interpolate16(ctx, curves->graph[i], comp_points[i]); + else ret = interpolate8(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 < 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) + dump_curves(curves->plot_filename, curves->graph, comp_points, curves->lut_size); + + 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_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; + + 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_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, ff_filter_get_nb_threads(ctx))); + + if (out != in) + av_frame_free(&in); + + return ff_filter_frame(outlink, out); +} + +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, + }, + { 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 = curves_init, + .uninit = curves_uninit, + .query_formats = query_formats, + .inputs = curves_inputs, + .outputs = curves_outputs, + .priv_class = &curves_class, + .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS, +}; |