mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
8 years ago
parent
dd49eff930
commit
dfc4ce5f5d
6 changed files with 225 additions and 1 deletions
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/*
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* Copyright (c) 2017 Paul B Mahol |
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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 "libavutil/opt.h" |
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#include "libavutil/imgutils.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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typedef struct LumakeyContext { |
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const AVClass *class; |
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int threshold; |
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int tolerance; |
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int softness; |
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int white; |
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int black; |
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int max; |
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int (*do_lumakey_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs); |
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} LumakeyContext; |
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static int do_lumakey_slice8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) |
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{ |
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LumakeyContext *s = ctx->priv; |
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AVFrame *frame = arg; |
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const int slice_start = (frame->height * jobnr) / nb_jobs; |
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const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs; |
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uint8_t *alpha = frame->data[3] + slice_start * frame->linesize[3]; |
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const uint8_t *luma = frame->data[0] + slice_start * frame->linesize[0]; |
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const int so = s->softness; |
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const int w = s->white; |
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const int b = s->black; |
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int x, y; |
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for (y = slice_start; y < slice_end; y++) { |
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for (x = 0; x < frame->width; x++) { |
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if (luma[x] >= b && luma[x] <= w) { |
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alpha[x] = 0; |
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} else if (luma[x] > b - so && luma[x] < w + so) { |
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if (luma[x] < b) { |
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alpha[x] = 255 - (luma[x] - b + so) * 255 / so; |
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} else { |
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alpha[x] = (luma[x] - w) * 255 / so; |
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} |
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} |
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} |
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luma += frame->linesize[0]; |
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alpha += frame->linesize[3]; |
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} |
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return 0; |
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} |
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static int do_lumakey_slice16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) |
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{ |
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LumakeyContext *s = ctx->priv; |
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AVFrame *frame = arg; |
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const int slice_start = (frame->height * jobnr) / nb_jobs; |
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const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs; |
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uint16_t *alpha = (uint16_t *)(frame->data[3] + slice_start * frame->linesize[3]); |
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const uint16_t *luma = (const uint16_t *)(frame->data[0] + slice_start * frame->linesize[0]); |
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const int so = s->softness; |
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const int w = s->white; |
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const int b = s->black; |
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const int m = s->max; |
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int x, y; |
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for (y = slice_start; y < slice_end; y++) { |
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for (x = 0; x < frame->width; x++) { |
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if (luma[x] >= b && luma[x] <= w) { |
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alpha[x] = 0; |
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} else if (luma[x] > b - so && luma[x] < w + so) { |
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if (luma[x] < b) { |
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alpha[x] = m - (luma[x] - b + so) * m / so; |
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} else { |
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alpha[x] = (luma[x] - w) * m / so; |
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} |
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} |
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} |
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luma += frame->linesize[0] / 2; |
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alpha += frame->linesize[3] / 2; |
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} |
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return 0; |
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} |
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static int config_input(AVFilterLink *inlink) |
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{ |
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
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AVFilterContext *ctx = inlink->dst; |
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LumakeyContext *s = ctx->priv; |
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int depth; |
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depth = desc->comp[0].depth; |
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if (depth == 8) { |
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s->white = av_clip_uint8(s->threshold + s->tolerance); |
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s->black = av_clip_uint8(s->threshold - s->tolerance); |
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s->do_lumakey_slice = do_lumakey_slice8; |
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} else { |
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s->max = (1 << depth) - 1; |
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s->white = av_clip(s->threshold + s->tolerance, 0, s->max); |
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s->black = av_clip(s->threshold - s->tolerance, 0, s->max); |
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s->do_lumakey_slice = do_lumakey_slice16; |
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} |
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return 0; |
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} |
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static int filter_frame(AVFilterLink *link, AVFrame *frame) |
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{ |
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AVFilterContext *ctx = link->dst; |
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LumakeyContext *s = ctx->priv; |
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int ret; |
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if (ret = av_frame_make_writable(frame)) |
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return ret; |
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if (ret = ctx->internal->execute(ctx, s->do_lumakey_slice, frame, NULL, FFMIN(frame->height, ff_filter_get_nb_threads(ctx)))) |
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return ret; |
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return ff_filter_frame(ctx->outputs[0], frame); |
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} |
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static av_cold int query_formats(AVFilterContext *ctx) |
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{ |
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static const enum AVPixelFormat pixel_fmts[] = { |
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P, |
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AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA420P9, |
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AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA420P10, |
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AV_PIX_FMT_YUVA444P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA420P16, |
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AV_PIX_FMT_NONE |
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}; |
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AVFilterFormats *formats; |
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formats = ff_make_format_list(pixel_fmts); |
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if (!formats) |
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return AVERROR(ENOMEM); |
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return ff_set_common_formats(ctx, formats); |
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} |
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static const AVFilterPad lumakey_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_input, |
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}, |
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{ NULL } |
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}; |
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static const AVFilterPad lumakey_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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#define OFFSET(x) offsetof(LumakeyContext, x) |
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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static const AVOption lumakey_options[] = { |
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{ "threshold", "set the threshold value", OFFSET(threshold), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS }, |
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{ "tolerance", "set the tolerance value", OFFSET(tolerance), AV_OPT_TYPE_INT, {.i64=1}, 0, UINT16_MAX, FLAGS }, |
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{ "softness", "set the softness value", OFFSET(softness), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS }, |
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{ NULL } |
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}; |
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AVFILTER_DEFINE_CLASS(lumakey); |
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AVFilter ff_vf_lumakey = { |
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.name = "lumakey", |
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.description = NULL_IF_CONFIG_SMALL("Turns a certain luma into transparency."), |
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.priv_size = sizeof(LumakeyContext), |
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.priv_class = &lumakey_class, |
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.query_formats = query_formats, |
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.inputs = lumakey_inputs, |
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.outputs = lumakey_outputs, |
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS, |
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}; |
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