avfilter: add floodfill filter

1 files changed, 433 insertions, 0 deletions

diff --git a/libavfilter/vf_floodfill.c b/libavfilter/vf_floodfill.c
new file mode 100644
index 0000000000..323dd0e2fa
--- /dev/null
+++ b/libavfilter/vf_floodfill.c
@@ -0,0 +1,433 @@
+/*
+ * 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 "libavutil/intreadwrite.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct Points {
+    uint16_t x, y;
+} Points;
+
+typedef struct FloodfillContext {
+    const AVClass *class;
+
+    int x, y;
+    int s0, s1, s2, s3;
+    int d0, d1, d2, d3;
+
+    int back, front;
+    Points *points;
+
+    int (*is_same)(AVFrame *frame, int x, int y,
+                   unsigned s0, unsigned s1, unsigned s2, unsigned s3);
+    void (*set_pixel)(AVFrame *frame, int x, int y,
+                      unsigned d0, unsigned d1, unsigned d2, unsigned d3);
+    void (*pick_pixel)(AVFrame *frame, int x, int y,
+                       int *s0, int *s1, int *s2, int *s3);
+} FloodfillContext;
+
+static int is_inside(int x, int y, int w, int h)
+{
+    if (x >= 0 && x < w && y >= 0 && y < h)
+        return 1;
+    return 0;
+}
+
+static int is_same4(AVFrame *frame, int x, int y,
+                    unsigned s0, unsigned s1, unsigned s2, unsigned s3)
+{
+    unsigned c0 = frame->data[0][y * frame->linesize[0] + x];
+    unsigned c1 = frame->data[1][y * frame->linesize[1] + x];
+    unsigned c2 = frame->data[2][y * frame->linesize[2] + x];
+    unsigned c3 = frame->data[3][y * frame->linesize[3] + x];
+
+    if (s0 == c0 && s1 == c1 && s2 == c2 && s3 == c3)
+        return 1;
+    return 0;
+}
+
+static int is_same4_16(AVFrame *frame, int x, int y,
+                       unsigned s0, unsigned s1, unsigned s2, unsigned s3)
+{
+    unsigned c0 = AV_RN16(frame->data[0] + y * frame->linesize[0] + 2 * x);
+    unsigned c1 = AV_RN16(frame->data[1] + y * frame->linesize[1] + 2 * x);
+    unsigned c2 = AV_RN16(frame->data[2] + y * frame->linesize[2] + 2 * x);
+    unsigned c3 = AV_RN16(frame->data[3] + y * frame->linesize[3] + 2 * x);
+
+    if (s0 == c0 && s1 == c1 && s2 == c2 && s3 == c3)
+        return 1;
+    return 0;
+}
+
+static int is_same3(AVFrame *frame, int x, int y,
+                    unsigned s0, unsigned s1, unsigned s2, unsigned s3)
+{
+    unsigned c0 = frame->data[0][y * frame->linesize[0] + x];
+    unsigned c1 = frame->data[1][y * frame->linesize[1] + x];
+    unsigned c2 = frame->data[2][y * frame->linesize[2] + x];
+
+    if (s0 == c0 && s1 == c1 && s2 == c2)
+        return 1;
+    return 0;
+}
+
+static int is_same3_16(AVFrame *frame, int x, int y,
+                       unsigned s0, unsigned s1, unsigned s2, unsigned s3)
+{
+    unsigned c0 = AV_RN16(frame->data[0] + y * frame->linesize[0] + 2 * x);
+    unsigned c1 = AV_RN16(frame->data[1] + y * frame->linesize[1] + 2 * x);
+    unsigned c2 = AV_RN16(frame->data[2] + y * frame->linesize[2] + 2 * x);
+
+    if (s0 == c0 && s1 == c1 && s2 == c2)
+        return 1;
+    return 0;
+}
+
+static int is_same1(AVFrame *frame, int x, int y,
+                    unsigned s0, unsigned s1, unsigned s2, unsigned s3)
+{
+    unsigned c0 = frame->data[0][y * frame->linesize[0] + x];
+
+    if (s0 == c0)
+        return 1;
+    return 0;
+}
+
+static int is_same1_16(AVFrame *frame, int x, int y,
+                       unsigned s0, unsigned s1, unsigned s2, unsigned s3)
+{
+    unsigned c0 = AV_RN16(frame->data[0] + y * frame->linesize[0] + 2 * x);
+
+    if (s0 == c0)
+        return 1;
+    return 0;
+}
+
+static void set_pixel1(AVFrame *frame, int x, int y,
+                       unsigned d0, unsigned d1, unsigned d2, unsigned d3)
+{
+    frame->data[0][y * frame->linesize[0] + x] = d0;
+}
+
+static void set_pixel1_16(AVFrame *frame, int x, int y,
+                          unsigned d0, unsigned d1, unsigned d2, unsigned d3)
+{
+    AV_WN16(frame->data[0] + y * frame->linesize[0] + 2 * x, d0);
+}
+
+static void set_pixel3(AVFrame *frame, int x, int y,
+                       unsigned d0, unsigned d1, unsigned d2, unsigned d3)
+{
+    frame->data[0][y * frame->linesize[0] + x] = d0;
+    frame->data[1][y * frame->linesize[1] + x] = d1;
+    frame->data[2][y * frame->linesize[2] + x] = d2;
+}
+
+static void set_pixel3_16(AVFrame *frame, int x, int y,
+                          unsigned d0, unsigned d1, unsigned d2, unsigned d3)
+{
+    AV_WN16(frame->data[0] + y * frame->linesize[0] + 2 * x, d0);
+    AV_WN16(frame->data[1] + y * frame->linesize[1] + 2 * x, d1);
+    AV_WN16(frame->data[2] + y * frame->linesize[2] + 2 * x, d2);
+}
+
+static void set_pixel4(AVFrame *frame, int x, int y,
+                       unsigned d0, unsigned d1, unsigned d2, unsigned d3)
+{
+    frame->data[0][y * frame->linesize[0] + x] = d0;
+    frame->data[1][y * frame->linesize[1] + x] = d1;
+    frame->data[2][y * frame->linesize[2] + x] = d2;
+    frame->data[3][y * frame->linesize[3] + x] = d3;
+}
+
+static void set_pixel4_16(AVFrame *frame, int x, int y,
+                          unsigned d0, unsigned d1, unsigned d2, unsigned d3)
+{
+    AV_WN16(frame->data[0] + y * frame->linesize[0] + 2 * x, d0);
+    AV_WN16(frame->data[1] + y * frame->linesize[1] + 2 * x, d1);
+    AV_WN16(frame->data[2] + y * frame->linesize[2] + 2 * x, d2);
+    AV_WN16(frame->data[3] + y * frame->linesize[3] + 2 * x, d3);
+}
+
+static void pick_pixel1(AVFrame *frame, int x, int y,
+                        int *s0, int *s1, int *s2, int *s3)
+{
+    if (*s0 < 0)
+        *s0 = frame->data[0][y * frame->linesize[0] + x];
+}
+
+static void pick_pixel1_16(AVFrame *frame, int x, int y,
+                           int *s0, int *s1, int *s2, int *s3)
+{
+    if (*s0 < 0)
+        *s0 = AV_RN16(frame->data[0] + y * frame->linesize[0] + 2 * x);
+}
+
+static void pick_pixel3(AVFrame *frame, int x, int y,
+                        int *s0, int *s1, int *s2, int *s3)
+{
+    if (*s0 < 0)
+        *s0 = frame->data[0][y * frame->linesize[0] + x];
+    if (*s1 < 0)
+        *s1 = frame->data[1][y * frame->linesize[1] + x];
+    if (*s2 < 0)
+        *s2 = frame->data[2][y * frame->linesize[2] + x];
+}
+
+static void pick_pixel3_16(AVFrame *frame, int x, int y,
+                           int *s0, int *s1, int *s2, int *s3)
+{
+    if (*s0 < 0)
+        *s0 = AV_RN16(frame->data[0] + y * frame->linesize[0] + 2 * x);
+    if (*s1 < 0)
+        *s1 = AV_RN16(frame->data[1] + y * frame->linesize[1] + 2 * x);
+    if (*s2 < 0)
+        *s2 = AV_RN16(frame->data[2] + y * frame->linesize[2] + 2 * x);
+}
+
+static void pick_pixel4(AVFrame *frame, int x, int y,
+                        int *s0, int *s1, int *s2, int *s3)
+{
+    if (*s0 < 0)
+        *s0 = frame->data[0][y * frame->linesize[0] + x];
+    if (*s1 < 0)
+        *s1 = frame->data[1][y * frame->linesize[1] + x];
+    if (*s2 < 0)
+        *s2 = frame->data[2][y * frame->linesize[2] + x];
+    if (*s3 < 0)
+        *s3 = frame->data[3][y * frame->linesize[3] + x];
+}
+
+static void pick_pixel4_16(AVFrame *frame, int x, int y,
+                           int *s0, int *s1, int *s2, int *s3)
+{
+    if (*s0 < 0)
+        *s0 = AV_RN16(frame->data[0] + y * frame->linesize[0] + 2 * x);
+    if (*s1 < 0)
+        *s1 = AV_RN16(frame->data[1] + y * frame->linesize[1] + 2 * x);
+    if (*s2 < 0)
+        *s2 = AV_RN16(frame->data[2] + y * frame->linesize[2] + 2 * x);
+    if (*s3 < 0)
+        *s3 = AV_RN16(frame->data[3] + y * frame->linesize[3] + 2 * x);
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+    AVFilterContext *ctx = inlink->dst;
+    FloodfillContext *s = ctx->priv;
+    int nb_planes = av_pix_fmt_count_planes(inlink->format);
+    int depth;
+
+    depth = desc->comp[0].depth;
+    if (depth == 8) {
+        switch (nb_planes) {
+        case 1: s->set_pixel  = set_pixel1;
+                s->is_same    = is_same1;
+                s->pick_pixel = pick_pixel1; break;
+        case 3: s->set_pixel  = set_pixel3;
+                s->is_same    = is_same3;
+                s->pick_pixel = pick_pixel3; break;
+        case 4: s->set_pixel  = set_pixel4;
+                s->is_same    = is_same4;
+                s->pick_pixel = pick_pixel4; break;
+       }
+    } else {
+        switch (nb_planes) {
+        case 1: s->set_pixel  = set_pixel1_16;
+                s->is_same    = is_same1_16;
+                s->pick_pixel = pick_pixel1_16; break;
+        case 3: s->set_pixel  = set_pixel3_16;
+                s->is_same    = is_same3_16;
+                s->pick_pixel = pick_pixel3_16; break;
+        case 4: s->set_pixel  = set_pixel4_16;
+                s->is_same    = is_same4_16;
+                s->pick_pixel = pick_pixel4_16; break;
+       }
+    }
+
+    s->front = s->back = 0;
+    s->points = av_calloc(inlink->w * inlink->h, 4 * sizeof(Points));
+    if (!s->points)
+        return AVERROR(ENOMEM);
+
+    return 0;
+}
+
+static int filter_frame(AVFilterLink *link, AVFrame *frame)
+{
+    AVFilterContext *ctx = link->dst;
+    FloodfillContext *s = ctx->priv;
+    const unsigned d0 = s->d0;
+    const unsigned d1 = s->d1;
+    const unsigned d2 = s->d2;
+    const unsigned d3 = s->d3;
+    int s0 = s->s0;
+    int s1 = s->s1;
+    int s2 = s->s2;
+    int s3 = s->s3;
+    const int w = frame->width;
+    const int h = frame->height;
+    int ret;
+
+    if (ret = av_frame_make_writable(frame))
+        return ret;
+
+    if (is_inside(s->x, s->y, w, h)) {
+        s->pick_pixel(frame, s->x, s->y, &s0, &s1, &s2, &s3);
+
+        if (s->is_same(frame, s->x, s->y, s0, s1, s2, s3)) {
+            s->points[s->front].x = s->x;
+            s->points[s->front].y = s->y;
+            s->front++;
+        }
+
+        while (s->front > s->back) {
+            int x, y;
+
+            s->front--;
+            x = s->points[s->front].x;
+            y = s->points[s->front].y;
+
+            if (s->is_same(frame, x, y, s0, s1, s2, s3)) {
+                s->set_pixel(frame, x, y, d0, d1, d2, d3);
+
+                if (is_inside(x + 1, y, w, h)) {
+                    s->points[s->front]  .x = x + 1;
+                    s->points[s->front++].y = y;
+                }
+
+                if (is_inside(x - 1, y, w, h)) {
+                    s->points[s->front]  .x = x - 1;
+                    s->points[s->front++].y = y;
+                }
+
+                if (is_inside(x, y + 1, w, h)) {
+                    s->points[s->front]  .x = x;
+                    s->points[s->front++].y = y + 1;
+                }
+
+                if (is_inside(x, y - 1, w, h)) {
+                    s->points[s->front]  .x = x;
+                    s->points[s->front++].y = y - 1;
+                }
+            }
+        }
+    }
+
+    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_GRAY8,
+        AV_PIX_FMT_YUV444P,
+        AV_PIX_FMT_YUVA444P,
+        AV_PIX_FMT_GBRP,
+        AV_PIX_FMT_GBRP9,
+        AV_PIX_FMT_GBRP10,
+        AV_PIX_FMT_GBRAP10,
+        AV_PIX_FMT_GBRP12,
+        AV_PIX_FMT_GBRAP12,
+        AV_PIX_FMT_GBRP14,
+        AV_PIX_FMT_GBRP16,
+        AV_PIX_FMT_GBRAP16,
+        AV_PIX_FMT_GBRAP,
+        AV_PIX_FMT_YUV444P9,
+        AV_PIX_FMT_YUVA444P9,
+        AV_PIX_FMT_YUV444P10,
+        AV_PIX_FMT_YUVA444P10,
+        AV_PIX_FMT_YUV444P12,
+        AV_PIX_FMT_YUV444P14,
+        AV_PIX_FMT_GRAY16,
+        AV_PIX_FMT_YUV444P16,
+        AV_PIX_FMT_YUVA444P16,
+        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 av_cold void uninit(AVFilterContext *ctx)
+{
+    FloodfillContext *s = ctx->priv;
+
+    av_freep(&s->points);
+}
+
+static const AVFilterPad floodfill_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = filter_frame,
+        .config_props = config_input,
+    },
+    { NULL }
+};
+
+static const AVFilterPad floodfill_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+#define OFFSET(x) offsetof(FloodfillContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption floodfill_options[] = {
+    { "x",  "set pixel x coordinate",             OFFSET(x),  AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
+    { "y",  "set pixel y coordinate",             OFFSET(y),  AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
+    { "s0", "set source #0 component value",      OFFSET(s0), AV_OPT_TYPE_INT, {.i64=0},-1, UINT16_MAX, FLAGS },
+    { "s1", "set source #1 component value",      OFFSET(s1), AV_OPT_TYPE_INT, {.i64=0},-1, UINT16_MAX, FLAGS },
+    { "s2", "set source #2 component value",      OFFSET(s2), AV_OPT_TYPE_INT, {.i64=0},-1, UINT16_MAX, FLAGS },
+    { "s3", "set source #3 component value",      OFFSET(s3), AV_OPT_TYPE_INT, {.i64=0},-1, UINT16_MAX, FLAGS },
+    { "d0", "set destination #0 component value", OFFSET(d0), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
+    { "d1", "set destination #1 component value", OFFSET(d1), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
+    { "d2", "set destination #2 component value", OFFSET(d2), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
+    { "d3", "set destination #3 component value", OFFSET(d3), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(floodfill);
+
+AVFilter ff_vf_floodfill = {
+    .name          = "floodfill",
+    .description   = NULL_IF_CONFIG_SMALL("Fill area with same color with another color."),
+    .priv_size     = sizeof(FloodfillContext),
+    .priv_class    = &floodfill_class,
+    .query_formats = query_formats,
+    .uninit        = uninit,
+    .inputs        = floodfill_inputs,
+    .outputs       = floodfill_outputs,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};