diff options
author | Clément Bœsch <ubitux@gmail.com> | 2013-04-02 14:48:32 +0400 |
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committer | Clément Bœsch <ubitux@gmail.com> | 2013-05-30 19:52:52 +0400 |
commit | 0ab9362fcb77c2d442fa20afcc2f1d9151228f06 (patch) | |
tree | 500ee6634ca2b81bb81390a30f62d655b6007dd4 /libavfilter/vf_vignette.c | |
parent | 310f9dd6988c286ab98b44796105440892f329de (diff) |
lavfi: add vignette filter.
Diffstat (limited to 'libavfilter/vf_vignette.c')
-rw-r--r-- | libavfilter/vf_vignette.c | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/libavfilter/vf_vignette.c b/libavfilter/vf_vignette.c new file mode 100644 index 0000000000..892d70c1b3 --- /dev/null +++ b/libavfilter/vf_vignette.c @@ -0,0 +1,330 @@ +/* + * 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/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; +} 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 }, + { 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 & PIX_FMT_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]; 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; + + 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 (inlink->sample_aspect_ratio.num > inlink->sample_aspect_ratio.den) { + s->xscale = av_q2d(inlink->sample_aspect_ratio); + s->yscale = 1; + s->dmax = hypot(inlink->w / 2., s->yscale * inlink->h / 2.); + } else { + s->yscale = av_q2d(inlink->sample_aspect_ratio); + s->xscale = 1; + s->dmax = hypot(s->xscale * inlink->w / 2., inlink->h / 2.); + } + + 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, +}; |