@@ -84,6 +84,7 @@ OBJS-$(CONFIG_YADIF_FILTER)                  += vf_yadif.o

 OBJS-$(CONFIG_BUFFER_FILTER)                 += vsrc_buffer.o

 OBJS-$(CONFIG_COLOR_FILTER)                  += vsrc_color.o

 OBJS-$(CONFIG_FREI0R_SRC_FILTER)             += vf_frei0r.o

+OBJS-$(CONFIG_MANDELBROT_FILTER)             += vsrc_mandelbrot.o

 OBJS-$(CONFIG_MOVIE_FILTER)                  += src_movie.o

 OBJS-$(CONFIG_MPTESTSRC_FILTER)              += vsrc_mptestsrc.o

 OBJS-$(CONFIG_NULLSRC_FILTER)                += vsrc_testsrc.o

@@ -95,6 +95,7 @@ void avfilter_register_all(void)

     REGISTER_FILTER (BUFFER,      buffer,      vsrc);

     REGISTER_FILTER (COLOR,       color,       vsrc);

     REGISTER_FILTER (FREI0R,      frei0r_src,  vsrc);

+    REGISTER_FILTER (MANDELBROT,  mandelbrot,  vsrc);

     REGISTER_FILTER (MOVIE,       movie,       vsrc);

     REGISTER_FILTER (MPTESTSRC,   mptestsrc,   vsrc);

     REGISTER_FILTER (NULLSRC,     nullsrc,     vsrc);

new file mode 100644

@@ -0,0 +1,172 @@

+/*

+ * Copyright (c) 2011 Michael Niedermayer

+ *

+ * 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

+ *

+ * The vsrc_color filter from Stefano Sabatini was used as template to create

+ * this

+ */

+

+/**

+ * @file

+ * Mandelbrot fraktal renderer

+ */

+

+#include "avfilter.h"

+#include "libavutil/imgutils.h"

+#include "libavutil/parseutils.h"

+

+typedef struct {

+    int w, h;

+    AVRational time_base;

+    uint64_t pts;

+    int maxiter;

+    double start_x;

+    double start_y;

+    double start_scale;

+} MBContext;

+

+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)

+{

+    MBContext *mb = ctx->priv;

+    char frame_size  [128] = "320x240";

+    char frame_rate  [128] = "25";

+    AVRational frame_rate_q;

+    int ret;

+

+    mb->maxiter=1024;

+    mb->start_x=-2.0;

+    mb->start_y=-1.5;

+    mb->start_scale=3.0;

+    if (args)

+        sscanf(args, "%127[^:]:%127[^:]:%d,%lf:%lf:%lf", frame_size, frame_rate, &mb->maxiter, &mb->start_x, &mb->start_y, &mb->start_scale);

+

+    if (av_parse_video_size(&mb->w, &mb->h, frame_size) < 0) {

+        av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size);

+        return AVERROR(EINVAL);

+    }

+    mb->start_scale /=mb->h;

+

+    if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 ||

+        frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {

+        av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate);

+        return AVERROR(EINVAL);

+    }

+    mb->time_base.num = frame_rate_q.den;

+    mb->time_base.den = frame_rate_q.num;

+

+    return 0;

+}

+

+static av_cold void uninit(AVFilterContext *ctx)

+{

+    MBContext *mb = ctx->priv;

+    int i;

+

+}

+

+static int query_formats(AVFilterContext *ctx)

+{

+    static const enum PixelFormat pix_fmts[] = {

+        PIX_FMT_BGR32,

+        PIX_FMT_NONE

+    };

+

+    avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));

+    return 0;

+}

+

+static int config_props(AVFilterLink *inlink)

+{

+    AVFilterContext *ctx = inlink->src;

+    MBContext *mb = ctx->priv;

+

+    if (av_image_check_size(mb->w, mb->h, 0, ctx) < 0)

+        return AVERROR(EINVAL);

+

+    inlink->w = mb->w;

+    inlink->h = mb->h;

+    inlink->time_base = mb->time_base;

+

+    return 0;

+}

+

+static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize, int64_t pts)

+{

+    MBContext *mb = ctx->priv;

+    int x,y,i;

+

+    for(y=0; y<mb->h; y++){

+        for(x=0; x<mb->w; x++){

+            double cr=mb->start_x+mb->start_scale*x;

+            double ci=mb->start_y+mb->start_scale*y;

+            double zr=cr;

+            double zi=ci;

+            const double B=100;

+            uint32_t c=0;

+

+            for(i=0; i<256; i++){

+                double t;

+                if(zr*zr + zi*zi > B){

+                    zr= i + (log(log(B)) - log(log(sqrt(zr*zr + zi*zi))))/log(2);

+                    c= lrintf((sin(zr)+1)*127) + lrintf((sin(zr/1.234)+1)*127)*256*256 + lrintf((sin(zr/100)+1)*127)*256;

+                    break;

+                }

+                t= zr*zr - zi*zi;

+                zi= 2*zr*zi + ci;

+                zr=       t + cr;

+            }

+            color[x + y*linesize]= c;

+        }

+    }

+}

+

+static int request_frame(AVFilterLink *link)

+{

+    MBContext *mb = link->src->priv;

+    AVFilterBufferRef *picref = avfilter_get_video_buffer(link, AV_PERM_WRITE, mb->w, mb->h);

+    picref->video->sample_aspect_ratio = (AVRational) {1, 1};

+    picref->pts = mb->pts++;

+    picref->pos = -1;

+

+    avfilter_start_frame(link, avfilter_ref_buffer(picref, ~0));

+    draw_mandelbrot(link->src, picref->data[0], picref->linesize[0]/4, picref->pts);

+    avfilter_draw_slice(link, 0, mb->h, 1);

+    avfilter_end_frame(link);

+    avfilter_unref_buffer(picref);

+

+    return 0;

+}

+

+AVFilter avfilter_vsrc_mandelbrot = {

+    .name        = "mandelbrot",

+    .description = NULL_IF_CONFIG_SMALL("Mandelbrot renderer"),

+

+    .priv_size = sizeof(MBContext),

+    .init      = init,

+    .uninit    = uninit,

+

+    .query_formats = query_formats,

+

+    .inputs    = (const AVFilterPad[]) {{ .name = NULL}},

+

+    .outputs   = (const AVFilterPad[]) {{ .name      = "default",

+                                    .type            = AVMEDIA_TYPE_VIDEO,

+                                    .request_frame   = request_frame,

+                                    .config_props    = config_props },

+                                  { .name = NULL}},

+};