avfilter: add dblur video filter

6 files changed, 334 insertions, 1 deletions

diff --git a/Changelog b/Changelog
index 6a4a63a643..f36cf4fc7f 100644
--- a/Changelog
+++ b/Changelog
@@ -73,6 +73,7 @@ version <next>:
 - untile filter
 - Simon & Schuster Interactive ADPCM encoder
 - PFM decoder
+- dblur video filter
 
 
 version 4.2:
diff --git a/doc/filters.texi b/doc/filters.texi
index 1f9ea89ada..f76604c51e 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -8563,6 +8563,29 @@ Set background opacity.
 Set display number format. Can be @code{hex}, or @code{dec}. Default is @code{hex}.
 @end table
 
+@section dblur
+Apply Directional blur filter.
+
+The filter accepts the following options:
+
+@table @option
+@item angle
+Set angle of directional blur. Default is @code{45}.
+
+@item radius
+Set radius of directional blur. Default is @code{5}.
+
+@item planes
+Set which planes to filter. By default all planes are filtered.
+@end table
+
+@subsection Commands
+This filter supports same @ref{commands} as options.
+The command accepts the same syntax of the corresponding option.
+
+If the specified expression is not valid, it is kept at its current
+value.
+
 @section dctdnoiz
 
 Denoise frames using 2D DCT (frequency domain filtering).
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 994a4172a3..5123540653 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -206,6 +206,7 @@ OBJS-$(CONFIG_CROPDETECT_FILTER)             += vf_cropdetect.o
 OBJS-$(CONFIG_CUE_FILTER)                    += f_cue.o
 OBJS-$(CONFIG_CURVES_FILTER)                 += vf_curves.o
 OBJS-$(CONFIG_DATASCOPE_FILTER)              += vf_datascope.o
+OBJS-$(CONFIG_DBLUR_FILTER)                  += vf_dblur.o
 OBJS-$(CONFIG_DCTDNOIZ_FILTER)               += vf_dctdnoiz.o
 OBJS-$(CONFIG_DEBAND_FILTER)                 += vf_deband.o
 OBJS-$(CONFIG_DEBLOCK_FILTER)                += vf_deblock.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index f2a44b0090..1183e40267 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -194,6 +194,7 @@ extern AVFilter ff_vf_cropdetect;
 extern AVFilter ff_vf_cue;
 extern AVFilter ff_vf_curves;
 extern AVFilter ff_vf_datascope;
+extern AVFilter ff_vf_dblur;
 extern AVFilter ff_vf_dctdnoiz;
 extern AVFilter ff_vf_deband;
 extern AVFilter ff_vf_deblock;
diff --git a/libavfilter/version.h b/libavfilter/version.h
index a820d0bbbf..980d9baca3 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   7
-#define LIBAVFILTER_VERSION_MINOR  83
+#define LIBAVFILTER_VERSION_MINOR  84
 #define LIBAVFILTER_VERSION_MICRO 100
 
 
diff --git a/libavfilter/vf_dblur.c b/libavfilter/vf_dblur.c
new file mode 100644
index 0000000000..cc127da73f
--- /dev/null
+++ b/libavfilter/vf_dblur.c
@@ -0,0 +1,307 @@
+/*
+ * Copyright (c) 2020 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/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct DBlurContext {
+    const AVClass *class;
+
+    float angle;
+    float radius;
+    int planes;
+
+    float b0, b1, q, c, R3;
+
+    int depth;
+    int planewidth[4];
+    int planeheight[4];
+    float *buffer;
+    int nb_planes;
+    void (*horiz_slice)(float *buffer, int width, int height, int steps, float nu, float bscale);
+} DBlurContext;
+
+#define OFFSET(x) offsetof(DBlurContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
+
+static const AVOption dblur_options[] = {
+    { "angle",  "set angle",            OFFSET(angle),  AV_OPT_TYPE_FLOAT, {.dbl=45},  0.0,  360, FLAGS },
+    { "radius", "set radius",           OFFSET(radius), AV_OPT_TYPE_FLOAT, {.dbl=5},     1, 8192, FLAGS },
+    { "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT,   {.i64=0xF},   0,  0xF, FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(dblur);
+
+#define f(n, m) (dst[(n) * width + (m)])
+
+static int filter_horizontally(AVFilterContext *ctx, int width, int height)
+{
+    DBlurContext *s = ctx->priv;
+    const float b0 = s->b0;
+    const float b1 = s->b1;
+    const float q = s->q;
+    const float c = s->c;
+    float *dst = s->buffer;
+    float g;
+
+    if (s->R3 > 0) {
+        for (int y = 1; y < height - 1; y++) {
+            g = q * f(0, 0) + c * f(0, 0);
+            for (int x = 0; x < width; x++) {
+                f(y, x) = b0 * f(y, x) + b1 * f(y - 1, x) + g;
+                g = q * f(y, x) + c * f(y - 1, x);
+            }
+        }
+
+        for (int y = height - 2; y >= 0; y--) {
+            g = q * f(y, width - 1) + c * f(y, width - 1);
+            for (int x = width - 1; x >= 0; x--) {
+                f(y, x) = b0 * f(y, x) + b1 * f(y + 1, x) + g;
+                g = q * f(y, x) + c * f(y + 1, x);
+            }
+        }
+    } else {
+        for (int y = 1; y < height - 1; y++) {
+            g = q * f(0, width - 1) + c * f(0, width - 1);
+            for (int x = width - 1; x >= 0; x--) {
+                f(y, x) = b0 * f(y, x) + b1 * f(y - 1, x) + g;
+                g = q * f(y, x) + c * f(y - 1, x);
+            }
+        }
+
+        for (int y = height - 2; y >= 0; y--) {
+            g = q * f(y, 0) + c * f(y, 0);
+            for (int x = 0; x < width; x++) {
+                f(y, x) = b0 * f(y, x) + b1 * f(y + 1, x) + g;
+                g = q * f(y, x) + c * f(y + 1, x);
+            }
+        }
+    }
+
+    return 0;
+}
+
+static void diriir2d(AVFilterContext *ctx, int plane)
+{
+    DBlurContext *s = ctx->priv;
+    const int width = s->planewidth[plane];
+    const int height = s->planeheight[plane];
+
+    filter_horizontally(ctx, width, height);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum AVPixelFormat pix_fmts[] = {
+        AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
+        AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
+        AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUV420P,
+        AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
+        AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
+        AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
+        AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
+        AV_PIX_FMT_YUV420P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV440P12,
+        AV_PIX_FMT_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
+        AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
+        AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
+        AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
+        AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
+        AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
+        AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10,
+        AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14, AV_PIX_FMT_GBRP16,
+        AV_PIX_FMT_GBRAP, AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
+        AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
+        AV_PIX_FMT_NONE
+    };
+
+    return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+    DBlurContext *s = inlink->dst->priv;
+
+    s->depth = desc->comp[0].depth;
+    s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
+    s->planewidth[0] = s->planewidth[3] = inlink->w;
+    s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+    s->planeheight[0] = s->planeheight[3] = inlink->h;
+
+    s->nb_planes = av_pix_fmt_count_planes(inlink->format);
+
+    s->buffer = av_malloc_array(FFALIGN(inlink->w, 16), FFALIGN(inlink->h, 16) * sizeof(*s->buffer));
+    if (!s->buffer)
+        return AVERROR(ENOMEM);
+
+    return 0;
+}
+
+static void set_params(DBlurContext *s, float angle, float r)
+{
+    float mu, nu, R1, R2, w1, w2;
+    float a0, a1, a2, a3;
+
+    angle = angle * M_PI / 180.f;
+
+    mu = cosf(angle);
+    nu = sinf(angle);
+    R1 = (mu * r) * (mu * r);
+    R2 = (nu * r) * (nu * r);
+    s->R3 = mu * nu * r * r;
+    w1 = sqrtf(0.25f + R1);
+    w2 = sqrtf(0.25f + R2);
+    a0 = (w1 + 0.5f) * (w2 + 0.5f) - fabsf(s->R3);
+    a1 = 0.5f + w2 - a0;
+    a2 = 0.5f + w1 - a0;
+    a3 = a0 - w1 - w2;
+    s->b0 = 1.f / a0;
+    s->b1 = -a2 / a0;
+    s->q = -a1 / a0;
+    s->c = -a3 / a0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    DBlurContext *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    AVFrame *out;
+    int plane;
+
+    set_params(s, s->angle, s->radius);
+
+    if (av_frame_is_writable(in)) {
+        out = in;
+    } else {
+        out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+        if (!out) {
+            av_frame_free(&in);
+            return AVERROR(ENOMEM);
+        }
+        av_frame_copy_props(out, in);
+    }
+
+    for (plane = 0; plane < s->nb_planes; plane++) {
+        const int height = s->planeheight[plane];
+        const int width = s->planewidth[plane];
+        float *bptr = s->buffer;
+        const uint8_t *src = in->data[plane];
+        const uint16_t *src16 = (const uint16_t *)in->data[plane];
+        uint8_t *dst = out->data[plane];
+        uint16_t *dst16 = (uint16_t *)out->data[plane];
+        int y, x;
+
+        if (!(s->planes & (1 << plane))) {
+            if (out != in)
+                av_image_copy_plane(out->data[plane], out->linesize[plane],
+                                    in->data[plane], in->linesize[plane],
+                                    width * ((s->depth + 7) / 8), height);
+            continue;
+        }
+
+        if (s->depth == 8) {
+            for (y = 0; y < height; y++) {
+                for (x = 0; x < width; x++) {
+                    bptr[x] = src[x];
+                }
+                bptr += width;
+                src += in->linesize[plane];
+            }
+        } else {
+            for (y = 0; y < height; y++) {
+                for (x = 0; x < width; x++) {
+                    bptr[x] = src16[x];
+                }
+                bptr += width;
+                src16 += in->linesize[plane] / 2;
+            }
+        }
+
+        diriir2d(ctx, plane);
+
+        bptr = s->buffer;
+        if (s->depth == 8) {
+            for (y = 0; y < height; y++) {
+                for (x = 0; x < width; x++) {
+                    dst[x] = bptr[x];
+                }
+                bptr += width;
+                dst += out->linesize[plane];
+            }
+        } else {
+            for (y = 0; y < height; y++) {
+                for (x = 0; x < width; x++) {
+                    dst16[x] = bptr[x];
+                }
+                bptr += width;
+                dst16 += out->linesize[plane] / 2;
+            }
+        }
+    }
+
+    if (out != in)
+        av_frame_free(&in);
+    return ff_filter_frame(outlink, out);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    DBlurContext *s = ctx->priv;
+
+    av_freep(&s->buffer);
+}
+
+static const AVFilterPad dblur_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = config_input,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad dblur_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_dblur = {
+    .name          = "dblur",
+    .description   = NULL_IF_CONFIG_SMALL("Apply Directional Blur filter."),
+    .priv_size     = sizeof(DBlurContext),
+    .priv_class    = &dblur_class,
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .inputs        = dblur_inputs,
+    .outputs       = dblur_outputs,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+    .process_command = ff_filter_process_command,
+};