From dfc4ce5f5ddb7ae0934bb3ca40b99932cf3e1cb0 Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Sun, 23 Apr 2017 19:59:32 +0200 Subject: [PATCH] avfilter: add lumakey filter Signed-off-by: Paul B Mahol --- Changelog | 1 + doc/filters.texi | 20 ++++ libavfilter/Makefile | 1 + libavfilter/allfilters.c | 1 + libavfilter/version.h | 2 +- libavfilter/vf_lumakey.c | 201 +++++++++++++++++++++++++++++++++++++++ 6 files changed, 225 insertions(+), 1 deletion(-) create mode 100644 libavfilter/vf_lumakey.c diff --git a/Changelog b/Changelog index ffc591d93f..f1fb014cdb 100644 --- a/Changelog +++ b/Changelog @@ -4,6 +4,7 @@ releases are sorted from youngest to oldest. version : - deflicker video filter - doubleweave video filter +- lumakey video filter version 3.3: - CrystalHD decoder moved to new decode API diff --git a/doc/filters.texi b/doc/filters.texi index 4c733f016e..0ee6792926 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -9278,6 +9278,26 @@ Interpolate values using a tetrahedron. @end table @end table +@section lumakey + +Turn certain luma values into transparency. + +The filter accepts the following options: + +@table @option +@item threshold +Set the luma which will be used as base for transparency. +Default value is @code{0}. + +@item tolerance +Set the range of luma values to be keyed out. +Default value is @code{0}. + +@item softness +Set the range of softness. Default value is @code{0}. +Use this to control gradual transition from zero to full transparency. +@end table + @section lut, lutrgb, lutyuv Compute a look-up table for binding each pixel component input value diff --git a/libavfilter/Makefile b/libavfilter/Makefile index 50c5132555..074c6907ef 100644 --- a/libavfilter/Makefile +++ b/libavfilter/Makefile @@ -212,6 +212,7 @@ OBJS-$(CONFIG_INTERLEAVE_FILTER) += f_interleave.o OBJS-$(CONFIG_KERNDEINT_FILTER) += vf_kerndeint.o OBJS-$(CONFIG_LENSCORRECTION_FILTER) += vf_lenscorrection.o OBJS-$(CONFIG_LOOP_FILTER) += f_loop.o +OBJS-$(CONFIG_LUMAKEY_FILTER) += vf_lumakey.o OBJS-$(CONFIG_LUT_FILTER) += vf_lut.o OBJS-$(CONFIG_LUT2_FILTER) += vf_lut2.o framesync.o OBJS-$(CONFIG_LUT3D_FILTER) += vf_lut3d.o diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c index f482adb3c5..c69f79e6ac 100644 --- a/libavfilter/allfilters.c +++ b/libavfilter/allfilters.c @@ -223,6 +223,7 @@ static void register_all(void) REGISTER_FILTER(KERNDEINT, kerndeint, vf); REGISTER_FILTER(LENSCORRECTION, lenscorrection, vf); REGISTER_FILTER(LOOP, loop, vf); + REGISTER_FILTER(LUMAKEY, lumakey, vf); REGISTER_FILTER(LUT, lut, vf); REGISTER_FILTER(LUT2, lut2, vf); REGISTER_FILTER(LUT3D, lut3d, vf); diff --git a/libavfilter/version.h b/libavfilter/version.h index 8daadc3779..2fa8dbda95 100644 --- a/libavfilter/version.h +++ b/libavfilter/version.h @@ -30,7 +30,7 @@ #include "libavutil/version.h" #define LIBAVFILTER_VERSION_MAJOR 6 -#define LIBAVFILTER_VERSION_MINOR 86 +#define LIBAVFILTER_VERSION_MINOR 87 #define LIBAVFILTER_VERSION_MICRO 100 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \ diff --git a/libavfilter/vf_lumakey.c b/libavfilter/vf_lumakey.c new file mode 100644 index 0000000000..418538f929 --- /dev/null +++ b/libavfilter/vf_lumakey.c @@ -0,0 +1,201 @@ +/* + * Copyright (c) 2017 Paul B Mahol + * + * 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/imgutils.h" +#include "avfilter.h" +#include "formats.h" +#include "internal.h" +#include "video.h" + +typedef struct LumakeyContext { + const AVClass *class; + + int threshold; + int tolerance; + int softness; + + int white; + int black; + int max; + + int (*do_lumakey_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs); +} LumakeyContext; + +static int do_lumakey_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) +{ + LumakeyContext *s = ctx->priv; + AVFrame *frame = arg; + const int slice_start = (frame->height * jobnr) / nb_jobs; + const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs; + uint8_t *alpha = frame->data[3] + slice_start * frame->linesize[3]; + const uint8_t *luma = frame->data[0] + slice_start * frame->linesize[0]; + const int so = s->softness; + const int w = s->white; + const int b = s->black; + int x, y; + + for (y = slice_start; y < slice_end; y++) { + for (x = 0; x < frame->width; x++) { + if (luma[x] >= b && luma[x] <= w) { + alpha[x] = 0; + } else if (luma[x] > b - so && luma[x] < w + so) { + if (luma[x] < b) { + alpha[x] = 255 - (luma[x] - b + so) * 255 / so; + } else { + alpha[x] = (luma[x] - w) * 255 / so; + } + } + } + luma += frame->linesize[0]; + alpha += frame->linesize[3]; + } + + return 0; +} + +static int do_lumakey_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) +{ + LumakeyContext *s = ctx->priv; + AVFrame *frame = arg; + const int slice_start = (frame->height * jobnr) / nb_jobs; + const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs; + uint16_t *alpha = (uint16_t *)(frame->data[3] + slice_start * frame->linesize[3]); + const uint16_t *luma = (const uint16_t *)(frame->data[0] + slice_start * frame->linesize[0]); + const int so = s->softness; + const int w = s->white; + const int b = s->black; + const int m = s->max; + int x, y; + + for (y = slice_start; y < slice_end; y++) { + for (x = 0; x < frame->width; x++) { + if (luma[x] >= b && luma[x] <= w) { + alpha[x] = 0; + } else if (luma[x] > b - so && luma[x] < w + so) { + if (luma[x] < b) { + alpha[x] = m - (luma[x] - b + so) * m / so; + } else { + alpha[x] = (luma[x] - w) * m / so; + } + } + } + luma += frame->linesize[0] / 2; + alpha += frame->linesize[3] / 2; + } + + return 0; +} + +static int config_input(AVFilterLink *inlink) +{ + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); + AVFilterContext *ctx = inlink->dst; + LumakeyContext *s = ctx->priv; + int depth; + + depth = desc->comp[0].depth; + if (depth == 8) { + s->white = av_clip_uint8(s->threshold + s->tolerance); + s->black = av_clip_uint8(s->threshold - s->tolerance); + s->do_lumakey_slice = do_lumakey_slice8; + } else { + s->max = (1 << depth) - 1; + s->white = av_clip(s->threshold + s->tolerance, 0, s->max); + s->black = av_clip(s->threshold - s->tolerance, 0, s->max); + s->do_lumakey_slice = do_lumakey_slice16; + } + + return 0; +} + +static int filter_frame(AVFilterLink *link, AVFrame *frame) +{ + AVFilterContext *ctx = link->dst; + LumakeyContext *s = ctx->priv; + int ret; + + if (ret = av_frame_make_writable(frame)) + return ret; + + if (ret = ctx->internal->execute(ctx, s->do_lumakey_slice, frame, NULL, FFMIN(frame->height, ff_filter_get_nb_threads(ctx)))) + return ret; + + return ff_filter_frame(ctx->outputs[0], frame); +} + +static av_cold int query_formats(AVFilterContext *ctx) +{ + static const enum AVPixelFormat pixel_fmts[] = { + AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P, + AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA420P9, + AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA420P10, + AV_PIX_FMT_YUVA444P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA420P16, + AV_PIX_FMT_NONE + }; + AVFilterFormats *formats; + + formats = ff_make_format_list(pixel_fmts); + if (!formats) + return AVERROR(ENOMEM); + + return ff_set_common_formats(ctx, formats); +} + +static const AVFilterPad lumakey_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + .config_props = config_input, + }, + { NULL } +}; + +static const AVFilterPad lumakey_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + }, + { NULL } +}; + +#define OFFSET(x) offsetof(LumakeyContext, x) +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM + +static const AVOption lumakey_options[] = { + { "threshold", "set the threshold value", OFFSET(threshold), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS }, + { "tolerance", "set the tolerance value", OFFSET(tolerance), AV_OPT_TYPE_INT, {.i64=1}, 0, UINT16_MAX, FLAGS }, + { "softness", "set the softness value", OFFSET(softness), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS }, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(lumakey); + +AVFilter ff_vf_lumakey = { + .name = "lumakey", + .description = NULL_IF_CONFIG_SMALL("Turns a certain luma into transparency."), + .priv_size = sizeof(LumakeyContext), + .priv_class = &lumakey_class, + .query_formats = query_formats, + .inputs = lumakey_inputs, + .outputs = lumakey_outputs, + .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS, +};