avfilter: add midequalizer filter

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Changelog

@@ -20,6 +20,7 @@ version <next>:
 - abitscope multimedia filter
 - Scenarist Closed Captions demuxer and muxer
 - threshold filter
+- midequalizer filter
 
 version 3.2:
 - libopenmpt demuxer

doc/filters.texi

@@ -9643,6 +9643,17 @@ Macroblock size. Default @code{16}.
 Search parameter. Default @code{7}.
 @end table
 
+@section midequalizer
+
+Apply Midway Image Equalization effect using two video streams.
+
+This filter accepts the following option:
+
+@table @option
+@item planes
+Set which planes to process. Default is @code{15}, which is all available planes.
+@end table
+
 @section minterpolate
 
 Convert the video to specified frame rate using motion interpolation.

libavfilter/Makefile

@@ -219,6 +219,7 @@ OBJS-$(CONFIG_MCDEINT_FILTER)                += vf_mcdeint.o
 OBJS-$(CONFIG_MERGEPLANES_FILTER)            += vf_mergeplanes.o framesync.o
 OBJS-$(CONFIG_MESTIMATE_FILTER)              += vf_mestimate.o motion_estimation.o
 OBJS-$(CONFIG_METADATA_FILTER)               += f_metadata.o
+OBJS-$(CONFIG_MIDEQUALIZER_FILTER)           += vf_midequalizer.o framesync.o
 OBJS-$(CONFIG_MINTERPOLATE_FILTER)           += vf_minterpolate.o motion_estimation.o
 OBJS-$(CONFIG_MPDECIMATE_FILTER)             += vf_mpdecimate.o
 OBJS-$(CONFIG_NEGATE_FILTER)                 += vf_lut.o

libavfilter/allfilters.c

@@ -235,6 +235,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(MERGEPLANES,    mergeplanes,    vf);
     REGISTER_FILTER(MESTIMATE,      mestimate,      vf);
     REGISTER_FILTER(METADATA,       metadata,       vf);
+    REGISTER_FILTER(MIDEQUALIZER,   midequalizer,   vf);
     REGISTER_FILTER(MINTERPOLATE,   minterpolate,   vf);
     REGISTER_FILTER(MPDECIMATE,     mpdecimate,     vf);
     REGISTER_FILTER(NEGATE,         negate,         vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  72
+#define LIBAVFILTER_VERSION_MINOR  73
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

libavfilter/vf_midequalizer.c

+/*
+ * 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/imgutils.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+#include "avfilter.h"
+#include "framesync.h"
+
+typedef struct MidEqualizerContext {
+    const AVClass *class;
+    int width[2][4], height[2][4];
+    int nb_planes;
+    int planes;
+    int histogram_size;
+    float *histogram[2];
+    unsigned *cchange;
+    FFFrameSync fs;
+
+    void (*midequalizer)(const uint8_t *in0, const uint8_t *in1,
+                         uint8_t *dst,
+                         ptrdiff_t linesize1, ptrdiff_t linesize2,
+                         ptrdiff_t dlinesize,
+                         int w0, int h0,
+                         int w1, int h1,
+                         float *histogram1, float *histogram2,
+                         unsigned *cchange, size_t hsize);
+} MidEqualizerContext;
+
+#define OFFSET(x) offsetof(MidEqualizerContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption midequalizer_options[] = {
+    { "planes", "set planes", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=0xF}, 0, 0xF, FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(midequalizer);
+
+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_GBRP, AV_PIX_FMT_GBRAP,
+        AV_PIX_FMT_GRAY8,
+        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_YUV420P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV444P14,
+        AV_PIX_FMT_GBRP9, AV_PIX_FMT_GBRP10, AV_PIX_FMT_GBRP12, AV_PIX_FMT_GBRP14,
+        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_GBRAP10, AV_PIX_FMT_GBRAP12,
+        AV_PIX_FMT_NONE
+    };
+
+    return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+}
+
+static int process_frame(FFFrameSync *fs)
+{
+    AVFilterContext *ctx = fs->parent;
+    MidEqualizerContext *s = fs->opaque;
+    AVFilterLink *outlink = ctx->outputs[0];
+    AVFrame *out, *in0, *in1;
+    int ret;
+
+    if ((ret = ff_framesync_get_frame(&s->fs, 0, &in0, 0)) < 0 ||
+        (ret = ff_framesync_get_frame(&s->fs, 1, &in1, 0)) < 0)
+        return ret;
+
+    if (ctx->is_disabled) {
+        out = av_frame_clone(in0);
+        if (!out)
+            return AVERROR(ENOMEM);
+    } else {
+        int p;
+
+        out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+        if (!out)
+            return AVERROR(ENOMEM);
+        av_frame_copy_props(out, in0);
+
+        for (p = 0; p < s->nb_planes; p++) {
+            if (!((1 << p) & s->planes)) {
+                av_image_copy_plane(out->data[p], out->linesize[p], in0->data[p], in0->linesize[p],
+                                    s->width[0][p] * (1 + (s->histogram_size > 256)), s->height[0][p]);
+                continue;
+            }
+
+            s->midequalizer(in0->data[p], in1->data[p],
+                            out->data[p],
+                            in0->linesize[p], in1->linesize[p],
+                            out->linesize[p],
+                            s->width[0][p], s->height[0][p],
+                            s->width[1][p], s->height[1][p],
+                            s->histogram[0], s->histogram[1],
+                            s->cchange, s->histogram_size);
+        }
+    }
+    out->pts = av_rescale_q(in0->pts, s->fs.time_base, outlink->time_base);
+
+    return ff_filter_frame(outlink, out);
+}
+
+static void compute_histogram8(const uint8_t *src, ptrdiff_t linesize,
+                               int w, int h, float *histogram, size_t hsize)
+{
+    int y, x;
+
+    memset(histogram, 0, hsize * sizeof(*histogram));
+
+    for (y = 0; y < h; y++) {
+        for (x = 0; x < w; x++) {
+            histogram[src[x]] += 1;
+        }
+        src += linesize;
+    }
+
+    for (x = 0; x < hsize - 1; x++) {
+        histogram[x + 1] += histogram[x];
+        histogram[x] /= hsize;
+    }
+    histogram[x] /= hsize;
+}
+
+static void compute_histogram16(const uint16_t *src, ptrdiff_t linesize,
+                                int w, int h, float *histogram, size_t hsize)
+{
+    int y, x;
+
+    memset(histogram, 0, hsize * sizeof(*histogram));
+
+    for (y = 0; y < h; y++) {
+        for (x = 0; x < w; x++) {
+            histogram[src[x]] += 1;
+        }
+        src += linesize;
+    }
+
+    for (x = 0; x < hsize - 1; x++) {
+        histogram[x + 1] += histogram[x];
+        histogram[x] /= hsize;
+    }
+    histogram[x] /= hsize;
+}
+
+static void compute_contrast_change(float *histogram1, float *histogram2,
+                                    unsigned *cchange, size_t hsize)
+{
+    int i;
+
+    for (i = 0; i < hsize; i++) {
+        int j;
+
+        for (j = 0; j < hsize && histogram2[j] < histogram1[i]; j++);
+
+        cchange[i] = (i + j) / 2;
+    }
+}
+
+static void midequalizer8(const uint8_t *in0, const uint8_t *in1,
+                          uint8_t *dst,
+                          ptrdiff_t linesize1, ptrdiff_t linesize2,
+                          ptrdiff_t dlinesize,
+                          int w0, int h0,
+                          int w1, int h1,
+                          float *histogram1, float *histogram2,
+                          unsigned *cchange,
+                          size_t hsize)
+{
+    int x, y;
+
+    compute_histogram8(in0, linesize1, w0, h0, histogram1, hsize);
+    compute_histogram8(in1, linesize2, w1, h1, histogram2, hsize);
+
+    compute_contrast_change(histogram1, histogram2, cchange, hsize);
+
+    for (y = 0; y < h0; y++) {
+        for (x = 0; x < w0; x++) {
+            dst[x] = av_clip_uint8(cchange[in0[x]]);
+        }
+        dst += dlinesize;
+        in0 += linesize1;
+    }
+}
+
+static void midequalizer16(const uint8_t *in0, const uint8_t *in1,
+                           uint8_t *dst,
+                           ptrdiff_t linesize1, ptrdiff_t linesize2,
+                           ptrdiff_t dlinesize,
+                           int w0, int h0,
+                           int w1, int h1,
+                           float *histogram1, float *histogram2,
+                           unsigned *cchange,
+                           size_t hsize)
+{
+    const uint16_t *i = (const uint16_t *)in0;
+    uint16_t *d = (uint16_t *)dst;
+    int x, y;
+
+    compute_histogram16(i, linesize1 / 2, w0, h0, histogram1, hsize);
+    compute_histogram16((const uint16_t *)in1, linesize2 / 2, w1, h1, histogram2, hsize);
+
+    compute_contrast_change(histogram1, histogram2, cchange, hsize);
+
+    for (y = 0; y < h0; y++) {
+        for (x = 0; x < w0; x++) {
+            d[x] = cchange[i[x]];
+        }
+        d += dlinesize / 2;
+        i += linesize1 / 2;
+    }
+}
+
+static int config_input0(AVFilterLink *inlink)
+{
+    AVFilterContext *ctx = inlink->dst;
+    MidEqualizerContext *s = ctx->priv;
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+    int vsub, hsub;
+
+    s->nb_planes = av_pix_fmt_count_planes(inlink->format);
+
+    hsub = desc->log2_chroma_w;
+    vsub = desc->log2_chroma_h;
+
+    s->height[0][0] = s->height[0][3] = inlink->h;
+    s->width[0][0]  = s->width[0][3]  = inlink->w;
+    s->height[0][1] = s->height[0][2] = AV_CEIL_RSHIFT(inlink->h, vsub);
+    s->width[0][1]  = s->width[0][2]  = AV_CEIL_RSHIFT(inlink->w, hsub);
+
+    s->histogram_size = 1 << desc->comp[0].depth;
+
+    s->histogram[0] = av_calloc(s->histogram_size, sizeof(float));
+    s->histogram[1] = av_calloc(s->histogram_size, sizeof(float));
+    s->cchange      = av_calloc(s->histogram_size, sizeof(unsigned));
+    if (!s->histogram[0] || !s->histogram[1] || !s->cchange)
+        return AVERROR(ENOMEM);
+
+    if (s->histogram_size == 256) {
+        s->midequalizer = midequalizer8;
+    } else {
+        s->midequalizer = midequalizer16;
+    }
+
+    return 0;
+}
+
+static int config_input1(AVFilterLink *inlink)
+{
+    AVFilterContext *ctx = inlink->dst;
+    MidEqualizerContext *s = ctx->priv;
+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+    int vsub, hsub;
+
+    s->nb_planes = av_pix_fmt_count_planes(inlink->format);
+
+    hsub = desc->log2_chroma_w;
+    vsub = desc->log2_chroma_h;
+
+    s->height[1][0] = s->height[1][3] = inlink->h;
+    s->width[1][0]  = s->width[1][3]  = inlink->w;
+    s->height[1][1] = s->height[1][2] = AV_CEIL_RSHIFT(inlink->h, vsub);
+    s->width[1][1]  = s->width[1][2]  = AV_CEIL_RSHIFT(inlink->w, hsub);
+
+    return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    MidEqualizerContext *s = ctx->priv;
+    AVFilterLink *in0 = ctx->inputs[0];
+    AVFilterLink *in1 = ctx->inputs[1];
+    FFFrameSyncIn *in;
+    int ret;
+
+    if (in0->format != in1->format) {
+        av_log(ctx, AV_LOG_ERROR, "inputs must be of same pixel format\n");
+        return AVERROR(EINVAL);
+    }
+
+    outlink->w = in0->w;
+    outlink->h = in0->h;
+    outlink->time_base = in0->time_base;
+    outlink->sample_aspect_ratio = in0->sample_aspect_ratio;
+    outlink->frame_rate = in0->frame_rate;
+
+    if ((ret = ff_framesync_init(&s->fs, ctx, 2)) < 0)
+        return ret;
+
+    in = s->fs.in;
+    in[0].time_base = in0->time_base;
+    in[1].time_base = in1->time_base;
+    in[0].sync   = 1;
+    in[0].before = EXT_STOP;
+    in[0].after  = EXT_INFINITY;
+    in[1].sync   = 1;
+    in[1].before = EXT_STOP;
+    in[1].after  = EXT_INFINITY;
+    s->fs.opaque   = s;
+    s->fs.on_event = process_frame;
+
+    return ff_framesync_configure(&s->fs);
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
+{
+    MidEqualizerContext *s = inlink->dst->priv;
+    return ff_framesync_filter_frame(&s->fs, inlink, buf);
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+    MidEqualizerContext *s = outlink->src->priv;
+    return ff_framesync_request_frame(&s->fs, outlink);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    MidEqualizerContext *s = ctx->priv;
+
+    ff_framesync_uninit(&s->fs);
+    av_freep(&s->histogram[0]);
+    av_freep(&s->histogram[1]);
+    av_freep(&s->cchange);
+}
+
+static const AVFilterPad midequalizer_inputs[] = {
+    {
+        .name         = "in0",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = filter_frame,
+        .config_props = config_input0,
+    },
+    {
+        .name         = "in1",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = filter_frame,
+        .config_props = config_input1,
+    },
+    { NULL }
+};
+
+static const AVFilterPad midequalizer_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .config_props  = config_output,
+        .request_frame = request_frame,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_midequalizer = {
+    .name          = "midequalizer",
+    .description   = NULL_IF_CONFIG_SMALL("Apply Midway Equalization."),
+    .priv_size     = sizeof(MidEqualizerContext),
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .inputs        = midequalizer_inputs,
+    .outputs       = midequalizer_outputs,
+    .priv_class    = &midequalizer_class,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
+};