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avfilter/edgedetect: add a colormix mode.
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@ -3990,13 +3990,37 @@ by the low threshold.
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Default value for @var{low} is @code{20/255}, and default value for @var{high}
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is @code{50/255}.
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@item mode
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Define the drawing mode.
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@table @samp
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@item wires
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Draw white/gray wires on black background.
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@item colormix
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Mix the colors to create a paint/cartoon effect.
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@end table
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Example:
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Default value is @var{wires}.
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@end table
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@subsection Examples
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@itemize
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@item
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Standard edge detection with custom values for the hysteresis thresholding:
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@example
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edgedetect=low=0.1:high=0.4
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@end example
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@item
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Painting effect without thresholding:
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@example
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edgedetect=mode=colormix:high=0
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@end example
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@end itemize
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@section extractplanes
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Extract color channel components from input video stream into
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@ -25,19 +25,32 @@
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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/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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typedef struct {
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const AVClass *class;
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enum FilterMode {
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MODE_WIRES,
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MODE_COLORMIX,
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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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};
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typedef struct {
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const AVClass *class;
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struct plane_info planes[3];
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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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enum FilterMode mode;
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} EdgeDetectContext;
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#define OFFSET(x) offsetof(EdgeDetectContext, x)
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@ -45,6 +58,9 @@ typedef struct {
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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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{ NULL }
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};
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@ -61,21 +77,37 @@ static av_cold int init(AVFilterContext *ctx)
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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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if (edgedetect->mode == MODE_WIRES) {
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/* TODO: reindent */
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static const enum AVPixelFormat pix_fmts[] = {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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} else if (edgedetect->mode == MODE_COLORMIX) {
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static const enum AVPixelFormat pix_fmts[] = {AV_PIX_FMT_GBRP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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} else {
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av_assert0(0);
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}
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return 0;
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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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edgedetect->tmpbuf = av_malloc(inlink->w * inlink->h);
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edgedetect->gradients = av_calloc(inlink->w * inlink->h, sizeof(*edgedetect->gradients));
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edgedetect->directions = av_malloc(inlink->w * inlink->h);
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if (!edgedetect->tmpbuf || !edgedetect->gradients || !edgedetect->directions)
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return AVERROR(ENOMEM);
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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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plane->tmpbuf = av_malloc(inlink->w * inlink->h);
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plane->gradients = av_calloc(inlink->w * inlink->h, sizeof(*plane->gradients));
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plane->directions = av_malloc(inlink->w * inlink->h);
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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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@ -241,18 +273,29 @@ static void double_threshold(int low, int high, int w, int h,
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}
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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 = inlink->dst->outputs[0];
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uint8_t *tmpbuf = edgedetect->tmpbuf;
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uint16_t *gradients = edgedetect->gradients;
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int8_t *directions= edgedetect->directions;
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int direct = 0;
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int p, direct = 0;
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AVFrame *out;
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if (av_frame_is_writable(in)) {
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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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@ -264,10 +307,17 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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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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/* TODO: reindent */
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/* gaussian filter to reduce noise */
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gaussian_blur(ctx, inlink->w, inlink->h,
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tmpbuf, inlink->w,
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in->data[0], in->linesize[0]);
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in->data[p], in->linesize[p]);
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/* compute the 16-bits gradients and directions for the next step */
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sobel(inlink->w, inlink->h,
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@ -286,9 +336,16 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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/* keep high values, or low values surrounded by high values */
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double_threshold(edgedetect->low_u8, edgedetect->high_u8,
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inlink->w, inlink->h,
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out->data[0], out->linesize[0],
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out->data[p], out->linesize[p],
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tmpbuf, inlink->w);
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if (edgedetect->mode == MODE_COLORMIX) {
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color_mix(inlink->w, inlink->h,
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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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@ -296,10 +353,15 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
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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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av_freep(&edgedetect->tmpbuf);
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av_freep(&edgedetect->gradients);
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av_freep(&edgedetect->directions);
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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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@ -191,6 +191,9 @@ fate-filter-vflip_vflip: CMD = video_filter "vflip,vflip"
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FATE_FILTER_VSYNTH-$(call ALLYES, FORMAT_FILTER PERMS_FILTER EDGEDETECT_FILTER) += fate-filter-edgedetect
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fate-filter-edgedetect: CMD = video_filter "format=gray,perms=random,edgedetect"
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FATE_FILTER_VSYNTH-$(call ALLYES, FORMAT_FILTER PERMS_FILTER EDGEDETECT_FILTER) += fate-filter-edgedetect-colormix
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fate-filter-edgedetect-colormix: CMD = video_filter "format=gbrp,perms=random,edgedetect=mode=colormix"
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FATE_FILTER_VSYNTH-$(call ALLYES, PERMS_FILTER HUE_FILTER) += fate-filter-hue
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fate-filter-hue: CMD = video_filter "perms=random,hue=s=sin(2*PI*t)+1"
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1
tests/ref/fate/filter-edgedetect-colormix
Normal file
1
tests/ref/fate/filter-edgedetect-colormix
Normal file
@ -0,0 +1 @@
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edgedetect-colormix c84a2be00652610f968bef8c97d71ef4
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