avfilter: add bitplanenoise filter

Changelog

@@ -15,6 +15,7 @@ version <next>:
 - True Audio (TTA) muxer
 - crystalizer audio filter
 - acrusher audio filter
+- bitplanenoise video filter
 
 
 version 3.1:

doc/filters.texi

@@ -4410,6 +4410,21 @@ The filter accepts the following option:
 Set the minimal luminance value. Default is @code{16}.
 @end table
 
+@section bitplanenoise
+
+Show and measure bit plane noise.
+
+The filter accepts the following options:
+
+@table @option
+@item bitplane
+Set which plane to analyze. Default is @code{1}.
+
+@item filter
+Filter out noisy pixels from @code{bitplane} set above.
+Default is disabled.
+@end table
+
 @section blackdetect
 
 Detect video intervals that are (almost) completely black. Can be

libavfilter/Makefile

@@ -125,6 +125,7 @@ OBJS-$(CONFIG_ALPHAMERGE_FILTER)             += vf_alphamerge.o
 OBJS-$(CONFIG_ATADENOISE_FILTER)             += vf_atadenoise.o
 OBJS-$(CONFIG_BBOX_FILTER)                   += bbox.o vf_bbox.o
 OBJS-$(CONFIG_BENCH_FILTER)                  += f_bench.o
+OBJS-$(CONFIG_BITPLANENOISE_FILTER)          += vf_bitplanenoise.o
 OBJS-$(CONFIG_BLACKDETECT_FILTER)            += vf_blackdetect.o
 
 # video filters

libavfilter/allfilters.c

@@ -143,6 +143,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(ASS,            ass,            vf);
     REGISTER_FILTER(BENCH,          bench,          vf);
     REGISTER_FILTER(BBOX,           bbox,           vf);
+    REGISTER_FILTER(BITPLANENOISE,  bitplanenoise,  vf);
     REGISTER_FILTER(BLACKDETECT,    blackdetect,    vf);
     REGISTER_FILTER(BLACKFRAME,     blackframe,     vf);
     REGISTER_FILTER(BLEND,          blend,          vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  51
+#define LIBAVFILTER_VERSION_MINOR  52
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

libavfilter/vf_bitplanenoise.c

+/*
+ * Copyright (c) 2016 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 "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct BPNContext {
+    const AVClass *class;
+
+    int bitplane;
+    int filter;
+
+    int nb_planes;
+    int planeheight[4];
+    int planewidth[4];
+    int depth;
+} BPNContext;
+
+#define OFFSET(x) offsetof(BPNContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption bitplanenoise_options[] = {
+    { "bitplane", "set bit plane to use for measuring noise",  OFFSET(bitplane), AV_OPT_TYPE_INT,  {.i64=1}, 1, 16, FLAGS},
+    { "filter",   "show noisy pixels",                         OFFSET(filter),   AV_OPT_TYPE_BOOL, {.i64=0}, 0,  1, FLAGS},
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(bitplanenoise);
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum AVPixelFormat pixfmts[] = {
+        AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
+        AV_PIX_FMT_YUV440P,
+        AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
+        AV_PIX_FMT_YUVJ440P,
+        AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV420P9,
+        AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV420P10,
+        AV_PIX_FMT_YUV440P10,
+        AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
+        AV_PIX_FMT_YUV440P12,
+        AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
+        AV_PIX_FMT_YUV444P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV420P16,
+        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_GRAY8,
+        AV_PIX_FMT_GRAY16,
+        AV_PIX_FMT_NONE
+    };
+
+    AVFilterFormats *formats = ff_make_format_list(pixfmts);
+    if (!formats)
+        return AVERROR(ENOMEM);
+    return ff_set_common_formats(ctx, formats);
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+    AVFilterContext *ctx = inlink->dst;
+    BPNContext *s = ctx->priv;
+
+    s->nb_planes = desc->nb_components;
+
+    s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+    s->planeheight[0] = s->planeheight[3] = inlink->h;
+    s->planewidth[1]  = s->planewidth[2]  = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
+    s->planewidth[0]  = s->planewidth[3]  = inlink->w;
+
+    s->depth = desc->comp[0].depth;
+
+    return 0;
+}
+
+#define CHECK_BIT(x, a, b, c) { \
+    bit = (((val[(x)] & mask) == (val[(x) + (a)] & mask)) + \
+           ((val[(x)] & mask) == (val[(x) + (b)] & mask)) + \
+           ((val[(x)] & mask) == (val[(x) + (c)] & mask))) > 1; \
+    if (dst) \
+        dst[(x)] = factor * bit; \
+    stats[plane] += bit; }
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    AVFilterLink *outlink = ctx->outputs[0];
+    BPNContext *s = ctx->priv;
+    const int mask = (1 << (s->bitplane - 1));
+    const int factor = (1 << s->depth) - 1;
+    float stats[4] = { 0 };
+    char metabuf[128];
+    int plane, y, x, bit;
+    AVFrame *out = s->filter ? NULL : in;
+
+    if (!out) {
+        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);
+    }
+
+    if (s->depth <= 8) {
+        for (plane = 0; plane < s->nb_planes; plane++) {
+            const int linesize = in->linesize[plane];
+            const int dlinesize = out->linesize[plane];
+            uint8_t *val = in->data[plane];
+            uint8_t *dst = s->filter ? out->data[plane]: NULL;
+
+            for (y = 0; y < s->planeheight[plane] - 1; y++) {
+                CHECK_BIT(0, 1, 1 + linesize, linesize)
+
+                for (x = 1; x < s->planewidth[plane] - 1; x++) {
+                    CHECK_BIT(x, -1, 1, linesize)
+                }
+
+                CHECK_BIT(x, -1, -1 + linesize, linesize)
+
+                val += linesize;
+                if (dst)
+                    dst += dlinesize;
+            }
+
+            CHECK_BIT(0, 1, 1 - linesize, -linesize)
+
+            for (x = 1; x < s->planewidth[plane] - 1; x++) {
+                CHECK_BIT(x, -1, 1, -linesize)
+            }
+
+            CHECK_BIT(x, -1, -1 - linesize, -linesize)
+        }
+    } else {
+        for (plane = 0; plane < s->nb_planes; plane++) {
+            const int linesize = in->linesize[plane] / 2;
+            const int dlinesize = out->linesize[plane] / 2;
+            uint16_t *val = (uint16_t *)in->data[plane];
+            uint16_t *dst = s->filter ? (uint16_t *)out->data[plane] : NULL;
+
+            val = (uint16_t *)in->data[plane];
+            for (y = 0; y < s->planeheight[plane] - 1; y++) {
+                CHECK_BIT(0, 1, 1 + linesize, linesize)
+
+                for (x = 1; x < s->planewidth[plane] - 1; x++) {
+                    CHECK_BIT(x, -1, 1, linesize)
+                }
+
+                CHECK_BIT(x, -1, -1 + linesize, linesize)
+
+                val += linesize;
+                if (dst)
+                    dst += dlinesize;
+            }
+
+            CHECK_BIT(0, 1, 1 - linesize, -linesize)
+
+            for (x = 1; x < s->planewidth[plane] - 1; x++) {
+                CHECK_BIT(x, -1, 1, -linesize)
+            }
+
+            CHECK_BIT(x, -1, -1 -linesize, -linesize)
+        }
+    }
+
+    for (plane = 0; plane < s->nb_planes; plane++) {
+        char key[32];
+
+        stats[plane] /= s->planewidth[plane] * s->planeheight[plane];
+        snprintf(key, sizeof(key), "lavfi.bitplanenoise.%d.%d", plane, s->bitplane);
+        snprintf(metabuf, sizeof(metabuf), "%f", 1. - 2.* fabsf((stats[plane] - 0.5)));
+        av_dict_set(&out->metadata, key, metabuf, 0);
+    }
+
+    if (out != in)
+        av_frame_free(&in);
+
+    return ff_filter_frame(outlink, out);
+}
+
+static const AVFilterPad inputs[] = {
+    {
+        .name           = "default",
+        .type           = AVMEDIA_TYPE_VIDEO,
+        .filter_frame   = filter_frame,
+        .config_props   = config_input,
+    },
+    { NULL }
+};
+
+static const AVFilterPad outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_bitplanenoise = {
+    .name           = "bitplanenoise",
+    .description    = NULL_IF_CONFIG_SMALL("Measure bit plane noise."),
+    .priv_size      = sizeof(BPNContext),
+    .query_formats  = query_formats,
+    .inputs         = inputs,
+    .outputs        = outputs,
+    .priv_class     = &bitplanenoise_class,
+    .flags          = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};