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-rw-r--r--libavfilter/vf_curves.c552
1 files changed, 552 insertions, 0 deletions
diff --git a/libavfilter/vf_curves.c b/libavfilter/vf_curves.c
new file mode 100644
index 0000000000..482a046b48
--- /dev/null
+++ b/libavfilter/vf_curves.c
@@ -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 = inlink->dst->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,
+};
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