[FFmpeg-devel] [PATCH] avfilter: add deband filter

Paul B Mahol onemda at gmail.com
Sun Jul 12 23:12:18 CEST 2015


Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
 libavfilter/Makefile     |   1 +
 libavfilter/allfilters.c |   1 +
 libavfilter/vf_deband.c  | 183 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 185 insertions(+)
 create mode 100644 libavfilter/vf_deband.c

diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index a623433..ea5c7c8 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -111,6 +111,7 @@ OBJS-$(CONFIG_CROP_FILTER)                   += vf_crop.o
 OBJS-$(CONFIG_CROPDETECT_FILTER)             += vf_cropdetect.o
 OBJS-$(CONFIG_CURVES_FILTER)                 += vf_curves.o
 OBJS-$(CONFIG_DCTDNOIZ_FILTER)               += vf_dctdnoiz.o
+OBJS-$(CONFIG_DEBAND_FILTER)                 += vf_deband.o
 OBJS-$(CONFIG_DECIMATE_FILTER)               += vf_decimate.o
 OBJS-$(CONFIG_DEJUDDER_FILTER)               += vf_dejudder.o
 OBJS-$(CONFIG_DELOGO_FILTER)                 += vf_delogo.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index ab0dc1d..5128708 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -127,6 +127,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(CROPDETECT,     cropdetect,     vf);
     REGISTER_FILTER(CURVES,         curves,         vf);
     REGISTER_FILTER(DCTDNOIZ,       dctdnoiz,       vf);
+    REGISTER_FILTER(DEBAND,         deband,         vf);
     REGISTER_FILTER(DECIMATE,       decimate,       vf);
     REGISTER_FILTER(DEJUDDER,       dejudder,       vf);
     REGISTER_FILTER(DELOGO,         delogo,         vf);
diff --git a/libavfilter/vf_deband.c b/libavfilter/vf_deband.c
new file mode 100644
index 0000000..4facb67
--- /dev/null
+++ b/libavfilter/vf_deband.c
@@ -0,0 +1,183 @@
+/*
+ * Copyright (c) 2015 Niklas Haas
+ * Copyright (c) 2015 Paul B Mahol
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * TODO: fix obvious bugs, 16bit support, slice threading
+ */
+
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct DebandContext {
+    const AVClass *class;
+
+    float threshold;
+    float range_x;
+    float range_y;
+    float direction;
+
+    int nb_components;
+    int planewidth[4];
+    int planeheight[4];
+    int subw, subh;
+} DebandContext;
+
+#define OFFSET(x) offsetof(DebandContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption deband_options[] = {
+    { "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, {.dbl=0.04}, 0.0, 1.0, .flags = FLAGS },
+    { "range_x",   "set x range",   OFFSET(range_x),   AV_OPT_TYPE_FLOAT, {.dbl=0.05}, 0.0, 1.0, .flags = FLAGS },
+    { "range_y",   "set y range",   OFFSET(range_y),   AV_OPT_TYPE_FLOAT, {.dbl=0.05}, 0.0, 1.0, .flags = FLAGS },
+    { "direction", "set direction", OFFSET(direction), AV_OPT_TYPE_FLOAT, {.dbl=0.00}, 0.0, 2 * M_PI, .flags = FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(deband);
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum AVPixelFormat pix_fmts[] = {
+        AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,
+        AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,
+        AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
+        AV_PIX_FMT_YUV440P,  AV_PIX_FMT_YUVJ440P,
+        AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
+        AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
+        AV_PIX_FMT_NONE
+    };
+    AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
+    if (!fmts_list)
+        return AVERROR(ENOMEM);
+
+    return ff_set_common_formats(ctx, fmts_list);
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+    AVFilterContext *ctx = inlink->dst;
+    DebandContext *s = ctx->priv;
+
+    s->nb_components = desc->nb_components;
+
+    s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+    s->planeheight[0] = s->planeheight[3] = inlink->h;
+    s->planewidth[1]  = s->planewidth[2]  = FF_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
+    s->planewidth[0]  = s->planewidth[3]  = inlink->w;
+
+    s->subh = desc->log2_chroma_h;
+    s->subw = desc->log2_chroma_w;
+
+    return 0;
+}
+
+static float rand_dir(int x, int y)
+{
+    return sin(x * 12.9898 + y * 78.233) * 2 * M_PI;
+}
+
+static int get_avg(DebandContext *s, const uint8_t *src, int src_linesize,
+                       int w, int h, int y, int x, float direction)
+{
+    const int x_pos = cos(direction) * s->range_x * w;
+    const int y_pos = sin(direction) * s->range_y * h;
+    int p0, p1, p2, p3;
+
+    p0 = src[av_clip(y +  y_pos, 0, h - 1) * src_linesize + av_clip(x +  x_pos, 0, w - 1)];
+    p1 = src[av_clip(y + -y_pos, 0, h - 1) * src_linesize + av_clip(x +  x_pos, 0, w - 1)];
+    p2 = src[av_clip(y + -y_pos, 0, h - 1) * src_linesize + av_clip(x + -x_pos, 0, w - 1)];
+    p3 = src[av_clip(y +  y_pos, 0, h - 1) * src_linesize + av_clip(x + -x_pos, 0, w - 1)];
+
+    return (p0 + p1 + p2 + p3) / 4;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    AVFilterLink *outlink = ctx->outputs[0];
+    DebandContext *s = ctx->priv;
+    AVFrame *out;
+    const int thr = s->threshold * 255;
+    int x, y, p;
+
+    out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+    if (!out)
+        return AVERROR(ENOMEM);
+    av_frame_copy_props(out, in);
+
+    for (p = 0; p < s->nb_components; p++) {
+        const uint8_t *src_ptr = (const uint8_t *)in->data[p];
+        uint8_t *dst_ptr = (uint8_t *)out->data[p];
+        const int dst_linesize = out->linesize[p];
+        const int src_linesize = in->linesize[p];
+
+        for (y = 0; y < s->planeheight[p]; y++) {
+            for (x = 0; x < s->planewidth[p]; x++) {
+                int dir = s->direction == 0 ? rand_dir(x, y): s->direction;
+                int avg = get_avg(s, src_ptr, src_linesize,
+                                  s->planewidth[p], s->planeheight[p],
+                                  y, x, dir);
+                int src0 = src_ptr[y * src_linesize + x];
+                int diff = FFABS(src0 - avg);
+
+                dst_ptr[y * dst_linesize + x] = diff < thr ? avg: src0;
+            }
+        }
+    }
+
+    av_frame_free(&in);
+    return ff_filter_frame(outlink, out);
+}
+
+static const AVFilterPad avfilter_vf_deband_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = config_input,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad avfilter_vf_deband_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_deband = {
+    .name          = "deband",
+    .description   = NULL_IF_CONFIG_SMALL("Debands video."),
+    .priv_size     = sizeof(DebandContext),
+    .priv_class    = &deband_class,
+    .query_formats = query_formats,
+    .inputs        = avfilter_vf_deband_inputs,
+    .outputs       = avfilter_vf_deband_outputs,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};
-- 
1.7.11.2



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