/* * 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 <float.h> /* DBL_MAX */ #include "libavutil/opt.h" #include "libavutil/eval.h" #include "libavutil/avassert.h" #include "libavutil/pixdesc.h" #include "avfilter.h" #include "formats.h" #include "internal.h" #include "video.h" static const char *const var_names[] = { "w", // stream width "h", // stream height "n", // frame count "pts", // presentation timestamp expressed in AV_TIME_BASE units "r", // frame rate "t", // timestamp expressed in seconds "tb", // timebase NULL }; enum var_name { VAR_W, VAR_H, VAR_N, VAR_PTS, VAR_R, VAR_T, VAR_TB, VAR_NB }; typedef struct { const AVClass *class; const AVPixFmtDescriptor *desc; int backward; enum EvalMode { EVAL_MODE_INIT, EVAL_MODE_FRAME, EVAL_MODE_NB } eval_mode; #define DEF_EXPR_FIELDS(name) AVExpr *name##_pexpr; char *name##_expr; double name DEF_EXPR_FIELDS(angle); DEF_EXPR_FIELDS(x0); DEF_EXPR_FIELDS(y0); double var_values[VAR_NB]; float *fmap; int fmap_linesize; double dmax; float xscale, yscale; uint32_t dither; int do_dither; AVRational aspect; AVRational scale; } VignetteContext; #define OFFSET(x) offsetof(VignetteContext, x) #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM static const AVOption vignette_options[] = { { "angle", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS }, { "a", "set lens angle", OFFSET(angle_expr), AV_OPT_TYPE_STRING, {.str="PI/5"}, .flags = FLAGS }, { "x0", "set circle center position on x-axis", OFFSET(x0_expr), AV_OPT_TYPE_STRING, {.str="w/2"}, .flags = FLAGS }, { "y0", "set circle center position on y-axis", OFFSET(y0_expr), AV_OPT_TYPE_STRING, {.str="h/2"}, .flags = FLAGS }, { "mode", "set forward/backward mode", OFFSET(backward), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS, "mode" }, { "forward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 0}, INT_MIN, INT_MAX, FLAGS, "mode"}, { "backward", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = 1}, INT_MIN, INT_MAX, FLAGS, "mode"}, { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, "eval" }, { "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT}, .flags = FLAGS, .unit = "eval" }, { "frame", "eval expressions for each frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" }, { "dither", "set dithering", OFFSET(do_dither), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, FLAGS }, { "aspect", "set aspect ratio", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 1}, 0, DBL_MAX, .flags = FLAGS }, { NULL } }; AVFILTER_DEFINE_CLASS(vignette); static av_cold int init(AVFilterContext *ctx) { VignetteContext *s = ctx->priv; #define PARSE_EXPR(name) do { \ int ret = av_expr_parse(&s->name##_pexpr, s->name##_expr, var_names, \ NULL, NULL, NULL, NULL, 0, ctx); \ if (ret < 0) { \ av_log(ctx, AV_LOG_ERROR, "Unable to parse expression for '" \ AV_STRINGIFY(name) "'\n"); \ return ret; \ } \ } while (0) PARSE_EXPR(angle); PARSE_EXPR(x0); PARSE_EXPR(y0); return 0; } static av_cold void uninit(AVFilterContext *ctx) { VignetteContext *s = ctx->priv; av_freep(&s->fmap); av_expr_free(s->angle_pexpr); av_expr_free(s->x0_pexpr); av_expr_free(s->y0_pexpr); } static int query_formats(AVFilterContext *ctx) { static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE }; ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); return 0; } static double get_natural_factor(const VignetteContext *s, int x, int y) { const int xx = (x - s->x0) * s->xscale; const int yy = (y - s->y0) * s->yscale; const double dnorm = hypot(xx, yy) / s->dmax; if (dnorm > 1) { return 0; } else { const double c = cos(s->angle * dnorm); return (c*c)*(c*c); // do not remove braces, it helps compilers } } #define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts)) #define TS2T(ts, tb) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts) * av_q2d(tb)) static void update_context(VignetteContext *s, AVFilterLink *inlink, AVFrame *frame) { int x, y; float *dst = s->fmap; int dst_linesize = s->fmap_linesize; if (frame) { s->var_values[VAR_N] = inlink->frame_count; s->var_values[VAR_T] = TS2T(frame->pts, inlink->time_base); s->var_values[VAR_PTS] = TS2D(frame->pts); } else { s->var_values[VAR_N] = 0; s->var_values[VAR_T] = NAN; s->var_values[VAR_PTS] = NAN; } s->angle = av_clipf(av_expr_eval(s->angle_pexpr, s->var_values, NULL), 0, M_PI_2); s->x0 = av_expr_eval(s->x0_pexpr, s->var_values, NULL); s->y0 = av_expr_eval(s->y0_pexpr, s->var_values, NULL); if (s->backward) { for (y = 0; y < inlink->h; y++) { for (x = 0; x < inlink->w; x++) dst[x] = 1. / get_natural_factor(s, x, y); dst += dst_linesize; } } else { for (y = 0; y < inlink->h; y++) { for (x = 0; x < inlink->w; x++) dst[x] = get_natural_factor(s, x, y); dst += dst_linesize; } } } static inline double get_dither_value(VignetteContext *s) { double dv = 0; if (s->do_dither) { dv = s->dither / (double)(1LL<<32); s->dither = s->dither * 1664525 + 1013904223; } return dv; } static int filter_frame(AVFilterLink *inlink, AVFrame *in) { unsigned x, y; AVFilterContext *ctx = inlink->dst; VignetteContext *s = ctx->priv; AVFilterLink *outlink = inlink->dst->outputs[0]; AVFrame *out; 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); if (s->eval_mode == EVAL_MODE_FRAME) update_context(s, inlink, in); if (s->desc->flags & AV_PIX_FMT_FLAG_RGB) { uint8_t *dst = out->data[0]; const uint8_t *src = in ->data[0]; const float *fmap = s->fmap; const int dst_linesize = out->linesize[0]; const int src_linesize = in ->linesize[0]; const int fmap_linesize = s->fmap_linesize; for (y = 0; y < inlink->h; y++) { uint8_t *dstp = dst; const uint8_t *srcp = src; for (x = 0; x < inlink->w; x++, dstp += 3, srcp += 3) { const float f = fmap[x]; dstp[0] = av_clip_uint8(srcp[0] * f + get_dither_value(s)); dstp[1] = av_clip_uint8(srcp[1] * f + get_dither_value(s)); dstp[2] = av_clip_uint8(srcp[2] * f + get_dither_value(s)); } dst += dst_linesize; src += src_linesize; fmap += fmap_linesize; } } else { int plane; for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) { uint8_t *dst = out->data[plane]; const uint8_t *src = in ->data[plane]; const float *fmap = s->fmap; const int dst_linesize = out->linesize[plane]; const int src_linesize = in ->linesize[plane]; const int fmap_linesize = s->fmap_linesize; const int chroma = plane == 1 || plane == 2; const int hsub = chroma ? s->desc->log2_chroma_w : 0; const int vsub = chroma ? s->desc->log2_chroma_h : 0; const int w = FF_CEIL_RSHIFT(inlink->w, hsub); const int h = FF_CEIL_RSHIFT(inlink->h, vsub); for (y = 0; y < h; y++) { uint8_t *dstp = dst; const uint8_t *srcp = src; for (x = 0; x < w; x++) { const double dv = get_dither_value(s); if (chroma) *dstp++ = av_clip_uint8(fmap[x << hsub] * (*srcp++ - 127) + 127 + dv); else *dstp++ = av_clip_uint8(fmap[x ] * *srcp++ + dv); } dst += dst_linesize; src += src_linesize; fmap += fmap_linesize << vsub; } } } return ff_filter_frame(outlink, out); } static int config_props(AVFilterLink *inlink) { VignetteContext *s = inlink->dst->priv; AVRational sar = inlink->sample_aspect_ratio; s->desc = av_pix_fmt_desc_get(inlink->format); s->var_values[VAR_W] = inlink->w; s->var_values[VAR_H] = inlink->h; s->var_values[VAR_TB] = av_q2d(inlink->time_base); s->var_values[VAR_R] = inlink->frame_rate.num == 0 || inlink->frame_rate.den == 0 ? NAN : av_q2d(inlink->frame_rate); if (!sar.num || !sar.den) sar.num = sar.den = 1; if (sar.num > sar.den) { s->xscale = av_q2d(av_div_q(sar, s->aspect)); s->yscale = 1; } else { s->yscale = av_q2d(av_div_q(s->aspect, sar)); s->xscale = 1; } s->dmax = hypot(inlink->w / 2., inlink->h / 2.); av_log(s, AV_LOG_DEBUG, "xscale=%f yscale=%f dmax=%f\n", s->xscale, s->yscale, s->dmax); s->fmap_linesize = FFALIGN(inlink->w, 32); s->fmap = av_malloc(s->fmap_linesize * inlink->h * sizeof(*s->fmap)); if (!s->fmap) return AVERROR(ENOMEM); if (s->eval_mode == EVAL_MODE_INIT) update_context(s, inlink, NULL); return 0; } static const AVFilterPad vignette_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .filter_frame = filter_frame, .config_props = config_props, }, { NULL } }; static const AVFilterPad vignette_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; AVFilter avfilter_vf_vignette = { .name = "vignette", .description = NULL_IF_CONFIG_SMALL("Make or reverse a vignette effect."), .priv_size = sizeof(VignetteContext), .init = init, .uninit = uninit, .query_formats = query_formats, .inputs = vignette_inputs, .outputs = vignette_outputs, .priv_class = &vignette_class, .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, };