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264 lines
9.3 KiB
264 lines
9.3 KiB
/* |
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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/mem.h" |
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#include "libavutil/opt.h" |
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#include "avfilter.h" |
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#include "filters.h" |
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#include "formats.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, .unit = "mode" }, |
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{ "wires", "white/gray wires on black", 0, AV_OPT_TYPE_CONST, {.i64=MODE_WIRES}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" }, |
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{ "colormix", "mix colors", 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLORMIX}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" }, |
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{ "canny", "detect edges on planes", 0, AV_OPT_TYPE_CONST, {.i64=MODE_CANNY}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" }, |
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{ "planes", "set planes to filter", OFFSET(filter_planes), AV_OPT_TYPE_FLAGS, {.i64=7}, 1, 0x7, FLAGS, .unit = "flags" }, |
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{ "y", "filter luma plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_Y}, 0, 0, FLAGS, .unit = "flags" }, |
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{ "u", "filter u plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_U}, 0, 0, FLAGS, .unit = "flags" }, |
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{ "v", "filter v plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_V}, 0, 0, FLAGS, .unit = "flags" }, |
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{ "r", "filter red plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_R}, 0, 0, FLAGS, .unit = "flags" }, |
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{ "g", "filter green plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_G}, 0, 0, FLAGS, .unit = "flags" }, |
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{ "b", "filter blue plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_B}, 0, 0, FLAGS, .unit = "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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