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https://github.com/FFmpeg/FFmpeg.git
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2f62a433f2
Lots of video filters use a very simple input or output: An array with a single AVFilterPad whose name is "default" and whose type is AVMEDIA_TYPE_VIDEO; everything else is unset. Given that we never use pointer equality for inputs or outputs*, we can simply use a single AVFilterPad instead of dozens; this even saves .data.rel.ro (8312B here) as well as relocations. *: In fact, several filters (like the filters in vf_lut.c) already use the same outputs; furthermore, ff_filter_alloc() duplicates the input and output pads so that we do not even work with the pads directly. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
264 lines
9.2 KiB
C
264 lines
9.2 KiB
C
/*
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* Copyright (c) 2012-2014 Clément Bœsch <u pkh me>
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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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/**
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* @file
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* Edge detection filter
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*
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* @see https://en.wikipedia.org/wiki/Canny_edge_detector
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.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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#include "edge_common.h"
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#define PLANE_R 0x4
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#define PLANE_G 0x1
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#define PLANE_B 0x2
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#define PLANE_Y 0x1
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#define PLANE_U 0x2
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#define PLANE_V 0x4
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#define PLANE_A 0x8
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enum FilterMode {
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MODE_WIRES,
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MODE_COLORMIX,
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MODE_CANNY,
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NB_MODE
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};
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struct plane_info {
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uint8_t *tmpbuf;
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uint16_t *gradients;
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char *directions;
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int width, height;
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};
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typedef struct EdgeDetectContext {
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const AVClass *class;
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struct plane_info planes[3];
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int filter_planes;
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int nb_planes;
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double low, high;
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uint8_t low_u8, high_u8;
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int mode;
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} EdgeDetectContext;
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#define OFFSET(x) offsetof(EdgeDetectContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption edgedetect_options[] = {
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{ "high", "set high threshold", OFFSET(high), AV_OPT_TYPE_DOUBLE, {.dbl=50/255.}, 0, 1, FLAGS },
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{ "low", "set low threshold", OFFSET(low), AV_OPT_TYPE_DOUBLE, {.dbl=20/255.}, 0, 1, FLAGS },
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{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_WIRES}, 0, NB_MODE-1, FLAGS, "mode" },
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{ "wires", "white/gray wires on black", 0, AV_OPT_TYPE_CONST, {.i64=MODE_WIRES}, INT_MIN, INT_MAX, FLAGS, "mode" },
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{ "colormix", "mix colors", 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLORMIX}, INT_MIN, INT_MAX, FLAGS, "mode" },
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{ "canny", "detect edges on planes", 0, AV_OPT_TYPE_CONST, {.i64=MODE_CANNY}, INT_MIN, INT_MAX, FLAGS, "mode" },
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{ "planes", "set planes to filter", OFFSET(filter_planes), AV_OPT_TYPE_FLAGS, {.i64=7}, 1, 0x7, FLAGS, "flags" },
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{ "y", "filter luma plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_Y}, 0, 0, FLAGS, "flags" },
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{ "u", "filter u plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_U}, 0, 0, FLAGS, "flags" },
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{ "v", "filter v plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_V}, 0, 0, FLAGS, "flags" },
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{ "r", "filter red plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_R}, 0, 0, FLAGS, "flags" },
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{ "g", "filter green plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_G}, 0, 0, FLAGS, "flags" },
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{ "b", "filter blue plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_B}, 0, 0, FLAGS, "flags" },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(edgedetect);
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static av_cold int init(AVFilterContext *ctx)
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{
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EdgeDetectContext *edgedetect = ctx->priv;
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edgedetect->low_u8 = edgedetect->low * 255. + .5;
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edgedetect->high_u8 = edgedetect->high * 255. + .5;
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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const EdgeDetectContext *edgedetect = ctx->priv;
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static const enum AVPixelFormat wires_pix_fmts[] = {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE};
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static const enum AVPixelFormat canny_pix_fmts[] = {AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_GBRP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE};
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static const enum AVPixelFormat colormix_pix_fmts[] = {AV_PIX_FMT_GBRP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE};
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const enum AVPixelFormat *pix_fmts = NULL;
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if (edgedetect->mode == MODE_WIRES) {
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pix_fmts = wires_pix_fmts;
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} else if (edgedetect->mode == MODE_COLORMIX) {
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pix_fmts = colormix_pix_fmts;
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} else if (edgedetect->mode == MODE_CANNY) {
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pix_fmts = canny_pix_fmts;
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} else {
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av_assert0(0);
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}
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return ff_set_common_formats_from_list(ctx, pix_fmts);
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}
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static int config_props(AVFilterLink *inlink)
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{
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int p;
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AVFilterContext *ctx = inlink->dst;
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EdgeDetectContext *edgedetect = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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edgedetect->nb_planes = inlink->format == AV_PIX_FMT_GRAY8 ? 1 : 3;
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for (p = 0; p < edgedetect->nb_planes; p++) {
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struct plane_info *plane = &edgedetect->planes[p];
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int vsub = p ? desc->log2_chroma_h : 0;
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int hsub = p ? desc->log2_chroma_w : 0;
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plane->width = AV_CEIL_RSHIFT(inlink->w, hsub);
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plane->height = AV_CEIL_RSHIFT(inlink->h, vsub);
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plane->tmpbuf = av_malloc(plane->width * plane->height);
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plane->gradients = av_calloc(plane->width * plane->height, sizeof(*plane->gradients));
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plane->directions = av_malloc(plane->width * plane->height);
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if (!plane->tmpbuf || !plane->gradients || !plane->directions)
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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static void color_mix(int w, int h,
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uint8_t *dst, int dst_linesize,
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const uint8_t *src, int src_linesize)
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{
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int i, j;
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for (j = 0; j < h; j++) {
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for (i = 0; i < w; i++)
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dst[i] = (dst[i] + src[i]) >> 1;
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dst += dst_linesize;
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src += src_linesize;
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}
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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EdgeDetectContext *edgedetect = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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int p, direct = 0;
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AVFrame *out;
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if (edgedetect->mode != MODE_COLORMIX && av_frame_is_writable(in)) {
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direct = 1;
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out = in;
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} else {
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!out) {
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av_frame_free(&in);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(out, in);
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}
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for (p = 0; p < edgedetect->nb_planes; p++) {
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struct plane_info *plane = &edgedetect->planes[p];
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uint8_t *tmpbuf = plane->tmpbuf;
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uint16_t *gradients = plane->gradients;
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int8_t *directions = plane->directions;
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const int width = plane->width;
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const int height = plane->height;
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if (!((1 << p) & edgedetect->filter_planes)) {
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if (!direct)
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av_image_copy_plane(out->data[p], out->linesize[p],
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in->data[p], in->linesize[p],
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width, height);
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continue;
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}
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/* gaussian filter to reduce noise */
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ff_gaussian_blur_8(width, height,
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tmpbuf, width,
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in->data[p], in->linesize[p], 1);
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/* compute the 16-bits gradients and directions for the next step */
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ff_sobel_8(width, height,
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gradients, width,
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directions,width,
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tmpbuf, width, 1);
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/* non_maximum_suppression() will actually keep & clip what's necessary and
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* ignore the rest, so we need a clean output buffer */
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memset(tmpbuf, 0, width * height);
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ff_non_maximum_suppression(width, height,
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tmpbuf, width,
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directions,width,
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gradients, width);
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/* keep high values, or low values surrounded by high values */
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ff_double_threshold(edgedetect->low_u8, edgedetect->high_u8,
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width, height,
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out->data[p], out->linesize[p],
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tmpbuf, width);
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if (edgedetect->mode == MODE_COLORMIX) {
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color_mix(width, height,
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out->data[p], out->linesize[p],
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in->data[p], in->linesize[p]);
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}
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}
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if (!direct)
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av_frame_free(&in);
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return ff_filter_frame(outlink, out);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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int p;
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EdgeDetectContext *edgedetect = ctx->priv;
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for (p = 0; p < edgedetect->nb_planes; p++) {
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struct plane_info *plane = &edgedetect->planes[p];
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av_freep(&plane->tmpbuf);
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av_freep(&plane->gradients);
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av_freep(&plane->directions);
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}
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}
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static const AVFilterPad edgedetect_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_props,
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.filter_frame = filter_frame,
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},
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};
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const AVFilter ff_vf_edgedetect = {
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.name = "edgedetect",
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.description = NULL_IF_CONFIG_SMALL("Detect and draw edge."),
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.priv_size = sizeof(EdgeDetectContext),
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.init = init,
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.uninit = uninit,
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FILTER_INPUTS(edgedetect_inputs),
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FILTER_OUTPUTS(ff_video_default_filterpad),
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FILTER_QUERY_FUNC(query_formats),
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.priv_class = &edgedetect_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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