lavfi: port libmpcodecs delogo filter

The ported filter supports named option parsing and more YUV formats.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

configure

@@ -1482,6 +1482,7 @@ udp_protocol_deps="network"
 blackframe_filter_deps="gpl"
 boxblur_filter_deps="gpl"
 cropdetect_filter_deps="gpl"
+delogo_filter_deps="gpl"
 drawtext_filter_deps="libfreetype"
 frei0r_filter_deps="frei0r dlopen strtok_r"
 frei0r_src_filter_deps="frei0r dlopen strtok_r"

doc/filters.texi

@@ -381,6 +381,58 @@ indicates never reset and return the largest area encountered during
 playback.
 @end table
 
+@section delogo
+
+Suppress a TV station logo by a simple interpolation of the surrounding
+pixels. Just set a rectangle covering the logo and watch it disappear
+(and sometimes something even uglier appear - your mileage may vary).
+
+The filter accepts parameters as a string of the form
+"@var{x}:@var{y}:@var{w}:@var{h}:@var{band}", or as a list of
+@var{key}=@var{value} pairs, separated by ":".
+
+The description of the accepted parameters follows.
+
+@table @option
+
+@item x, y
+Specify the top left corner coordinates of the logo. They must be
+specified.
+
+@item w, h
+Specify the width and height of the logo to clear. They must be
+specified.
+
+@item band, t
+Specify the thickness of the fuzzy edge of the rectangle (added to
+@var{w} and @var{h}). The default value is 4.
+
+@item show
+When set to 1, a green rectangle is drawn on the screen to simplify
+finding the right @var{x}, @var{y}, @var{w}, @var{h} parameters, and
+@var{band} is set to 4. The default value is 0.
+
+@end table
+
+Some examples follow.
+
+@itemize
+
+@item
+Set a rectangle covering the area with top left corner coordinates 0,0
+and size 100x77, setting a band of size 10:
+@example
+delogo=0:0:100:77:10
+@end example
+
+@item
+As the previous example, but use named options:
+@example
+delogo=x=0:y=0:w=100:h=77:band=10
+@end example
+
+@end itemize
+
 @section drawbox
 
 Draw a colored box on the input image.

libavfilter/Makefile

@@ -24,6 +24,7 @@ OBJS-$(CONFIG_BOXBLUR_FILTER)                += vf_boxblur.o
 OBJS-$(CONFIG_COPY_FILTER)                   += vf_copy.o
 OBJS-$(CONFIG_CROP_FILTER)                   += vf_crop.o
 OBJS-$(CONFIG_CROPDETECT_FILTER)             += vf_cropdetect.o
+OBJS-$(CONFIG_DELOGO_FILTER)                 += vf_delogo.o
 OBJS-$(CONFIG_DRAWBOX_FILTER)                += vf_drawbox.o
 OBJS-$(CONFIG_DRAWTEXT_FILTER)               += vf_drawtext.o
 OBJS-$(CONFIG_FADE_FILTER)                   += vf_fade.o

libavfilter/allfilters.c

@@ -45,6 +45,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER (COPY,        copy,        vf);
     REGISTER_FILTER (CROP,        crop,        vf);
     REGISTER_FILTER (CROPDETECT,  cropdetect,  vf);
+    REGISTER_FILTER (DELOGO,      delogo,      vf);
     REGISTER_FILTER (DRAWBOX,     drawbox,     vf);
     REGISTER_FILTER (DRAWTEXT,    drawtext,    vf);
     REGISTER_FILTER (FADE,        fade,        vf);

libavfilter/avfilter.h

@@ -29,7 +29,7 @@
 #include "libavutil/rational.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  2
-#define LIBAVFILTER_VERSION_MINOR  10
+#define LIBAVFILTER_VERSION_MINOR  11
 #define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

libavfilter/vf_delogo.c

+/*
+ * Copyright (c) 2002 Jindrich Makovicka <makovick@gmail.com>
+ * Copyright (c) 2011 Stefano Sabatini
+ *
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Libav 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with Libav; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/**
+ * @file
+ * A very simple tv station logo remover
+ * Ported from MPlayer libmpcodecs/vf_delogo.c.
+ */
+
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+
+/**
+ * Apply a simple delogo algorithm to the image in dst and put the
+ * result in src.
+ *
+ * The algorithm is only applied to the region specified by the logo
+ * parameters.
+ *
+ * @param w      width of the input image
+ * @param h      height of the input image
+ * @param logo_x x coordinate of the top left corner of the logo region
+ * @param logo_y y coordinate of the top left corner of the logo region
+ * @param logo_w width of the logo
+ * @param logo_h height of the logo
+ * @param band   the size of the band around the processed area
+ * @param show   show a rectangle around the processed area, useful for
+ *               parameters tweaking
+ * @param direct if non-zero perform in-place processing
+ */
+static void apply_delogo(uint8_t *dst, int dst_linesize,
+                         uint8_t *src, int src_linesize,
+                         int w, int h,
+                         int logo_x, int logo_y, int logo_w, int logo_h,
+                         int band, int show, int direct)
+{
+    int x, y;
+    int interp, dist;
+    uint8_t *xdst, *xsrc;
+
+    uint8_t *topleft, *botleft, *topright;
+    int xclipl, xclipr, yclipt, yclipb;
+    int logo_x1, logo_x2, logo_y1, logo_y2;
+
+    xclipl = FFMAX(-logo_x, 0);
+    xclipr = FFMAX(logo_x+logo_w-w, 0);
+    yclipt = FFMAX(-logo_y, 0);
+    yclipb = FFMAX(logo_y+logo_h-h, 0);
+
+    logo_x1 = logo_x + xclipl;
+    logo_x2 = logo_x + logo_w - xclipr;
+    logo_y1 = logo_y + yclipt;
+    logo_y2 = logo_y + logo_h - yclipb;
+
+    topleft  = src+logo_y1     * src_linesize+logo_x1;
+    topright = src+logo_y1     * src_linesize+logo_x2-1;
+    botleft  = src+(logo_y2-1) * src_linesize+logo_x1;
+
+    dst += (logo_y1+1)*dst_linesize;
+    src += (logo_y1+1)*src_linesize;
+
+    if (!direct)
+        av_image_copy_plane(dst, dst_linesize, src, src_linesize, w, h);
+
+    for (y = logo_y1+1; y < logo_y2-1; y++) {
+        for (x = logo_x1+1,
+             xdst = dst+logo_x1+1,
+             xsrc = src+logo_x1+1; x < logo_x2-1; x++, xdst++, xsrc++) {
+            interp = (topleft[src_linesize*(y-logo_y  -yclipt)]   +
+                      topleft[src_linesize*(y-logo_y-1-yclipt)]   +
+                      topleft[src_linesize*(y-logo_y+1-yclipt)])  * (logo_w-(x-logo_x))/logo_w
+                   + (topright[src_linesize*(y-logo_y-yclipt)]    +
+                      topright[src_linesize*(y-logo_y-1-yclipt)]  +
+                      topright[src_linesize*(y-logo_y+1-yclipt)]) * (x-logo_x)/logo_w
+                   + (topleft[x-logo_x-xclipl]                    +
+                      topleft[x-logo_x-1-xclipl]                  +
+                      topleft[x-logo_x+1-xclipl])                 * (logo_h-(y-logo_y))/logo_h
+                   + (botleft[x-logo_x-xclipl]                    +
+                      botleft[x-logo_x-1-xclipl]                  +
+                      botleft[x-logo_x+1-xclipl])                 * (y-logo_y)/logo_h;
+            interp /= 6;
+
+            if (y >= logo_y+band && y < logo_y+logo_h-band &&
+                x >= logo_x+band && x < logo_x+logo_w-band) {
+                *xdst = interp;
+            } else {
+                dist = 0;
+                if      (x < logo_x+band)
+                    dist = FFMAX(dist, logo_x-x+band);
+                else if (x >= logo_x+logo_w-band)
+                    dist = FFMAX(dist, x-(logo_x+logo_w-1-band));
+
+                if      (y < logo_y+band)
+                    dist = FFMAX(dist, logo_y-y+band);
+                else if (y >= logo_y+logo_h-band)
+                    dist = FFMAX(dist, y-(logo_y+logo_h-1-band));
+
+                *xdst = (*xsrc*dist + interp*(band-dist))/band;
+                if (show && (dist == band-1))
+                    *xdst = 0;
+            }
+        }
+
+        dst += dst_linesize;
+        src += src_linesize;
+    }
+}
+
+typedef struct {
+    const AVClass *class;
+    int x, y, w, h, band, show;
+}  DelogoContext;
+
+#define OFFSET(x) offsetof(DelogoContext, x)
+
+static const AVOption delogo_options[]= {
+    {"x",    "set logo x position",       OFFSET(x),    FF_OPT_TYPE_INT, {-1}, -1, INT_MAX },
+    {"y",    "set logo y position",       OFFSET(y),    FF_OPT_TYPE_INT, {-1}, -1, INT_MAX },
+    {"w",    "set logo width",            OFFSET(w),    FF_OPT_TYPE_INT, {-1}, -1, INT_MAX },
+    {"h",    "set logo height",           OFFSET(h),    FF_OPT_TYPE_INT, {-1}, -1, INT_MAX },
+    {"band", "set delogo area band size", OFFSET(band), FF_OPT_TYPE_INT, { 4}, -1, INT_MAX },
+    {"t",    "set delogo area band size", OFFSET(band), FF_OPT_TYPE_INT, { 4}, -1, INT_MAX },
+    {"show", "show delogo area",          OFFSET(show), FF_OPT_TYPE_INT, { 0},  0, 1       },
+    {NULL},
+};
+
+static const char *delogo_get_name(void *ctx)
+{
+    return "delogo";
+}
+
+static const AVClass delogo_class = {
+    .class_name = "DelogoContext",
+    .item_name  = delogo_get_name,
+    .option     = delogo_options,
+};
+
+static int query_formats(AVFilterContext *ctx)
+{
+    enum PixelFormat pix_fmts[] = {
+        PIX_FMT_YUV444P,  PIX_FMT_YUV422P,  PIX_FMT_YUV420P,
+        PIX_FMT_YUV411P,  PIX_FMT_YUV410P,  PIX_FMT_YUV440P,
+        PIX_FMT_YUVA420P, PIX_FMT_GRAY8,
+        PIX_FMT_NONE
+    };
+
+    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
+    return 0;
+}
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+    DelogoContext *delogo = ctx->priv;
+    int ret = 0;
+
+    delogo->class = &delogo_class;
+    av_opt_set_defaults(delogo);
+
+    if (args)
+        ret = sscanf(args, "%d:%d:%d:%d:%d",
+                     &delogo->x, &delogo->y, &delogo->w, &delogo->h, &delogo->band);
+    if (ret == 5) {
+        if (delogo->band < 0)
+            delogo->show = 1;
+    } else if ((ret = (av_set_options_string(delogo, args, "=", ":"))) < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
+        return ret;
+    }
+
+#define CHECK_UNSET_OPT(opt)                                            \
+    if (delogo->opt == -1) {                                            \
+        av_log(delogo, AV_LOG_ERROR, "Option %s was not set.\n", #opt); \
+        return AVERROR(EINVAL);                                         \
+    }
+    CHECK_UNSET_OPT(x);
+    CHECK_UNSET_OPT(y);
+    CHECK_UNSET_OPT(w);
+    CHECK_UNSET_OPT(h);
+
+    if (delogo->show)
+        delogo->band = 4;
+
+    av_log(ctx, AV_LOG_DEBUG, "x:%d y:%d, w:%d h:%d band:%d show:%d\n",
+           delogo->x, delogo->y, delogo->w, delogo->h, delogo->band, delogo->show);
+
+    delogo->w += delogo->band*2;
+    delogo->h += delogo->band*2;
+    delogo->x -= delogo->band;
+    delogo->y -= delogo->band;
+
+    return 0;
+}
+
+static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
+{
+    AVFilterLink *outlink = inlink->dst->outputs[0];
+    AVFilterBufferRef *outpicref;
+
+    if (inpicref->perms & AV_PERM_PRESERVE) {
+        outpicref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
+                                              outlink->w, outlink->h);
+        avfilter_copy_buffer_ref_props(outpicref, inpicref);
+        outpicref->video->w = outlink->w;
+        outpicref->video->h = outlink->h;
+    } else
+        outpicref = inpicref;
+
+    outlink->out_buf = outpicref;
+    avfilter_start_frame(outlink, avfilter_ref_buffer(outpicref, ~0));
+}
+
+static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+
+static void end_frame(AVFilterLink *inlink)
+{
+    DelogoContext *delogo = inlink->dst->priv;
+    AVFilterLink *outlink = inlink->dst->outputs[0];
+    AVFilterBufferRef *inpicref  = inlink ->cur_buf;
+    AVFilterBufferRef *outpicref = outlink->out_buf;
+    int direct = inpicref == outpicref;
+    int hsub0 = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
+    int vsub0 = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
+    int plane;
+
+    for (plane = 0; plane < 4 && inpicref->data[plane]; plane++) {
+        int hsub = plane == 1 || plane == 2 ? hsub0 : 0;
+        int vsub = plane == 1 || plane == 2 ? vsub0 : 0;
+
+        apply_delogo(outpicref->data[plane], outpicref->linesize[plane],
+                     inpicref ->data[plane], inpicref ->linesize[plane],
+                     inlink->w>>hsub, inlink->h>>vsub,
+                     delogo->x>>hsub, delogo->y>>vsub,
+                     delogo->w>>hsub, delogo->h>>vsub,
+                     delogo->band>>FFMIN(hsub, vsub),
+                     delogo->show, direct);
+    }
+
+    avfilter_draw_slice(outlink, 0, inlink->h, 1);
+    avfilter_end_frame(outlink);
+    avfilter_unref_buffer(inpicref);
+    if (!direct)
+        avfilter_unref_buffer(outpicref);
+}
+
+AVFilter avfilter_vf_delogo = {
+    .name          = "delogo",
+    .description   = NULL_IF_CONFIG_SMALL("Remove logo from input video."),
+    .priv_size     = sizeof(DelogoContext),
+    .init          = init,
+    .query_formats = query_formats,
+
+    .inputs    = (AVFilterPad[]) {{ .name             = "default",
+                                    .type             = AVMEDIA_TYPE_VIDEO,
+                                    .get_video_buffer = avfilter_null_get_video_buffer,
+                                    .start_frame      = start_frame,
+                                    .draw_slice       = null_draw_slice,
+                                    .end_frame        = end_frame,
+                                    .min_perms        = AV_PERM_WRITE | AV_PERM_READ,
+                                    .rej_perms        = AV_PERM_PRESERVE },
+                                  { .name = NULL}},
+    .outputs   = (AVFilterPad[]) {{ .name             = "default",
+                                    .type             = AVMEDIA_TYPE_VIDEO, },
+                                  { .name = NULL}},
+};