340 lines
11 KiB
C
340 lines
11 KiB
C
/*
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* Copyright (c) 2013 Clément Bœsch
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <float.h> /* DBL_MAX */
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#include "libavutil/opt.h"
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#include "libavutil/eval.h"
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#include "libavutil/avassert.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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static const char *const var_names[] = {
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"w", // stream width
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"h", // stream height
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"n", // frame count
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"pts", // presentation timestamp expressed in AV_TIME_BASE units
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"r", // frame rate
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"t", // timestamp expressed in seconds
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"tb", // timebase
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NULL
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};
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enum var_name {
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VAR_W,
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VAR_H,
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VAR_N,
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VAR_PTS,
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VAR_R,
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VAR_T,
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VAR_TB,
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VAR_NB
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};
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typedef struct {
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const AVClass *class;
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const AVPixFmtDescriptor *desc;
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int backward;
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enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB } eval_mode;
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#define DEF_EXPR_FIELDS(name) AVExpr *name##_pexpr; char *name##_expr; double name
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DEF_EXPR_FIELDS(angle);
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DEF_EXPR_FIELDS(x0);
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DEF_EXPR_FIELDS(y0);
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double var_values[VAR_NB];
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float *fmap;
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int fmap_linesize;
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double dmax;
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float xscale, yscale;
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uint32_t dither;
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int do_dither;
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AVRational aspect;
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AVRational scale;
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} VignetteContext;
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#define OFFSET(x) offsetof(VignetteContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption vignette_options[] = {
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{ "angle", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS },
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{ "a", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS },
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{ "x0", "set circle center position on x-axis", OFFSET(x0_expr), AV_OPT_TYPE_STRING, {.str="w/2"}, .flags = FLAGS },
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{ "y0", "set circle center position on y-axis", OFFSET(y0_expr), AV_OPT_TYPE_STRING, {.str="h/2"}, .flags = FLAGS },
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{ "mode", "set forward/backward mode", OFFSET(backward), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS, "mode" },
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{ "forward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, FLAGS, "mode"},
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{ "backward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, FLAGS, "mode"},
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{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" },
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{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" },
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{ "frame", "eval expressions for each frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
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{ "dither", "set dithering", OFFSET(do_dither), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, FLAGS },
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{ "aspect", "set aspect ratio", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 1}, 0, DBL_MAX, .flags = FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(vignette);
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static av_cold int init(AVFilterContext *ctx)
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{
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VignetteContext *s = ctx->priv;
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#define PARSE_EXPR(name) do { \
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int ret = av_expr_parse(&s->name##_pexpr, s->name##_expr, var_names, \
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NULL, NULL, NULL, NULL, 0, ctx); \
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if (ret < 0) { \
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av_log(ctx, AV_LOG_ERROR, "Unable to parse expression for '" \
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AV_STRINGIFY(name) "'\n"); \
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return ret; \
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} \
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} while (0)
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PARSE_EXPR(angle);
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PARSE_EXPR(x0);
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PARSE_EXPR(y0);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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VignetteContext *s = ctx->priv;
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av_freep(&s->fmap);
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av_expr_free(s->angle_pexpr);
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av_expr_free(s->x0_pexpr);
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av_expr_free(s->y0_pexpr);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
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AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static double get_natural_factor(const VignetteContext *s, int x, int y)
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{
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const int xx = (x - s->x0) * s->xscale;
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const int yy = (y - s->y0) * s->yscale;
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const double dnorm = hypot(xx, yy) / s->dmax;
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if (dnorm > 1) {
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return 0;
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} else {
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const double c = cos(s->angle * dnorm);
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return (c*c)*(c*c); // do not remove braces, it helps compilers
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}
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}
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#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
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#define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts) * av_q2d(tb))
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static void update_context(VignetteContext *s, AVFilterLink *inlink, AVFrame *frame)
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{
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int x, y;
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float *dst = s->fmap;
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int dst_linesize = s->fmap_linesize;
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if (frame) {
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s->var_values[VAR_N] = inlink->frame_count;
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s->var_values[VAR_T] = TS2T(frame->pts, inlink->time_base);
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s->var_values[VAR_PTS] = TS2D(frame->pts);
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} else {
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s->var_values[VAR_N] = 0;
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s->var_values[VAR_T] = NAN;
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s->var_values[VAR_PTS] = NAN;
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}
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s->angle = av_clipf(av_expr_eval(s->angle_pexpr, s->var_values, NULL), 0, M_PI_2);
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s->x0 = av_expr_eval(s->x0_pexpr, s->var_values, NULL);
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s->y0 = av_expr_eval(s->y0_pexpr, s->var_values, NULL);
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if (s->backward) {
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for (y = 0; y < inlink->h; y++) {
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for (x = 0; x < inlink->w; x++)
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dst[x] = 1. / get_natural_factor(s, x, y);
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dst += dst_linesize;
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}
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} else {
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for (y = 0; y < inlink->h; y++) {
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for (x = 0; x < inlink->w; x++)
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dst[x] = get_natural_factor(s, x, y);
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dst += dst_linesize;
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}
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}
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}
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static inline double get_dither_value(VignetteContext *s)
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{
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double dv = 0;
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if (s->do_dither) {
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dv = s->dither / (double)(1LL<<32);
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s->dither = s->dither * 1664525 + 1013904223;
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}
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return dv;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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unsigned x, y;
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AVFilterContext *ctx = inlink->dst;
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VignetteContext *s = ctx->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFrame *out;
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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if (s->eval_mode == EVAL_MODE_FRAME)
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update_context(s, inlink, in);
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if (s->desc->flags & PIX_FMT_RGB) {
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uint8_t *dst = out->data[0];
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const uint8_t *src = in ->data[0];
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const float *fmap = s->fmap;
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const int dst_linesize = out->linesize[0];
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const int src_linesize = in ->linesize[0];
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const int fmap_linesize = s->fmap_linesize;
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for (y = 0; y < inlink->h; y++) {
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uint8_t *dstp = dst;
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const uint8_t *srcp = src;
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for (x = 0; x < inlink->w; x++, dstp += 3, srcp += 3) {
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const float f = fmap[x];
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dstp[0] = av_clip_uint8(srcp[0] * f + get_dither_value(s));
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dstp[1] = av_clip_uint8(srcp[1] * f + get_dither_value(s));
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dstp[2] = av_clip_uint8(srcp[2] * f + get_dither_value(s));
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}
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dst += dst_linesize;
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src += src_linesize;
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fmap += fmap_linesize;
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}
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} else {
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int plane;
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for (plane = 0; plane < 4 && in->data[plane]; plane++) {
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uint8_t *dst = out->data[plane];
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const uint8_t *src = in ->data[plane];
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const float *fmap = s->fmap;
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const int dst_linesize = out->linesize[plane];
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const int src_linesize = in ->linesize[plane];
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const int fmap_linesize = s->fmap_linesize;
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const int chroma = plane == 1 || plane == 2;
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const int hsub = chroma ? s->desc->log2_chroma_w : 0;
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const int vsub = chroma ? s->desc->log2_chroma_h : 0;
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const int w = FF_CEIL_RSHIFT(inlink->w, hsub);
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const int h = FF_CEIL_RSHIFT(inlink->h, vsub);
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for (y = 0; y < h; y++) {
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uint8_t *dstp = dst;
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const uint8_t *srcp = src;
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for (x = 0; x < w; x++) {
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const double dv = get_dither_value(s);
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if (chroma) *dstp++ = av_clip_uint8(fmap[x << hsub] * (*srcp++ - 127) + 127 + dv);
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else *dstp++ = av_clip_uint8(fmap[x ] * *srcp++ + dv);
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}
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dst += dst_linesize;
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src += src_linesize;
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fmap += fmap_linesize << vsub;
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}
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}
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}
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return ff_filter_frame(outlink, out);
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}
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static int config_props(AVFilterLink *inlink)
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{
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VignetteContext *s = inlink->dst->priv;
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AVRational sar = inlink->sample_aspect_ratio;
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s->desc = av_pix_fmt_desc_get(inlink->format);
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s->var_values[VAR_W] = inlink->w;
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s->var_values[VAR_H] = inlink->h;
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s->var_values[VAR_TB] = av_q2d(inlink->time_base);
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s->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ?
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NAN : av_q2d(inlink->frame_rate);
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if (!sar.num || !sar.den)
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sar.num = sar.den = 1;
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if (sar.num > sar.den) {
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s->xscale = av_q2d(av_div_q(sar, s->aspect));
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s->yscale = 1;
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} else {
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s->yscale = av_q2d(av_div_q(s->aspect, sar));
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s->xscale = 1;
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}
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s->dmax = hypot(inlink->w / 2., inlink->h / 2.);
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av_log(s, AV_LOG_DEBUG, "xscale=%f yscale=%f dmax=%f\n",
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s->xscale, s->yscale, s->dmax);
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s->fmap_linesize = FFALIGN(inlink->w, 32);
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s->fmap = av_malloc(s->fmap_linesize * inlink->h * sizeof(*s->fmap));
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if (!s->fmap)
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return AVERROR(ENOMEM);
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if (s->eval_mode == EVAL_MODE_INIT)
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update_context(s, inlink, NULL);
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return 0;
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}
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static const AVFilterPad vignette_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_props,
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},
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{ NULL }
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};
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static const AVFilterPad vignette_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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AVFilter avfilter_vf_vignette = {
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.name = "vignette",
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.description = NULL_IF_CONFIG_SMALL("Make or reverse a vignette effect."),
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.priv_size = sizeof(VignetteContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = vignette_inputs,
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.outputs = vignette_outputs,
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.priv_class = &vignette_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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