| /* |
| * 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 |
| }; |
| |
| enum EvalMode { |
| EVAL_MODE_INIT, |
| EVAL_MODE_FRAME, |
| EVAL_MODE_NB |
| }; |
| |
| typedef struct { |
| const AVClass *class; |
| const AVPixFmtDescriptor *desc; |
| int backward; |
| int eval_mode; ///< EvalMode |
| #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_BOOL, {.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 |
| }; |
| AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts); |
| if (!fmts_list) |
| return AVERROR(ENOMEM); |
| return ff_set_common_formats(ctx, fmts_list); |
| } |
| |
| 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] = NAN; |
| s->var_values[VAR_T] = NAN; |
| s->var_values[VAR_PTS] = NAN; |
| } |
| |
| s->angle = av_expr_eval(s->angle_pexpr, s->var_values, NULL); |
| 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 (isnan(s->x0) || isnan(s->y0) || isnan(s->angle)) |
| s->eval_mode = EVAL_MODE_FRAME; |
| |
| s->angle = av_clipf(s->angle, 0, M_PI_2); |
| |
| 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, direct = 0; |
| AVFilterContext *ctx = inlink->dst; |
| VignetteContext *s = ctx->priv; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| AVFrame *out; |
| |
| 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); |
| } |
| |
| 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 = AV_CEIL_RSHIFT(inlink->w, hsub); |
| const int h = AV_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; |
| } |
| } |
| } |
| |
| if (!direct) |
| av_frame_free(&in); |
| 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_array(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 ff_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, |
| }; |