@@ -15,6 +15,7 @@ version <next>:

 - True Audio (TTA) muxer

 - crystalizer audio filter

 - acrusher audio filter

+- bitplanenoise video filter

 version 3.1:

@@ -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

@@ -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

@@ -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);

@@ -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, \

new file mode 100644

@@ -0,0 +1,227 @@

+/*

+ * 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,

+};