gst/audiovisualizers/gstspacescope.c - mtk-gst-plugins-bad-debian - Git at Google

 /* GStreamer
  * Copyright (C) <2011> Stefan Kost <ensonic@users.sf.net>
  *
  * gstspacescope.c: simple stereo visualizer
  *
  * This program 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.
  *
  * This program 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 this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */
 /**
  * SECTION:element-spacescope
  * @see_also: goom
  *
  * Spacescope is a simple audio visualisation element. It maps the left and
  * right channel to x and y coordinates.
  *
  * <refsect2>
  * <title>Example launch line</title>
  * |[
  * gst-launch audiotestsrc ! audioconvert ! spacescope ! ximagesink
  * ]|
  * </refsect2>
  */
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include <stdlib.h>
 #include "gstspacescope.h"

 static GstStaticPadTemplate gst_space_scope_src_template =
 GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,
     GST_PAD_ALWAYS,
 #if G_BYTE_ORDER == G_BIG_ENDIAN
     GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("xRGB"))
 #else
     GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("BGRx"))
 #endif
     );

 static GstStaticPadTemplate gst_space_scope_sink_template =
 GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
     GST_PAD_ALWAYS,
     GST_STATIC_CAPS ("audio/x-raw, "
         "format = (string) " GST_AUDIO_NE (S16) ", "
         "layout = (string) interleaved, "
         "rate = (int) [ 8000, 96000 ], "
         "channels = (int) 2, " "channel-mask = (bitmask) 0x3")
     );


 GST_DEBUG_CATEGORY_STATIC (space_scope_debug);
 #define GST_CAT_DEFAULT space_scope_debug

 enum
 {
   PROP_0,
   PROP_STYLE
 };

 enum
 {
   STYLE_DOTS = 0,
   STYLE_LINES,
   STYLE_COLOR_DOTS,
   STYLE_COLOR_LINES,
   NUM_STYLES
 };

 #define GST_TYPE_SPACE_SCOPE_STYLE (gst_space_scope_style_get_type ())
 static GType
 gst_space_scope_style_get_type (void)
 {
   static GType gtype = 0;

   if (gtype == 0) {
     static const GEnumValue values[] = {
       {STYLE_DOTS, "draw dots (default)", "dots"},
       {STYLE_LINES, "draw lines", "lines"},
       {STYLE_COLOR_DOTS, "draw color dots", "color-dots"},
       {STYLE_COLOR_LINES, "draw color lines", "color-lines"},
       {0, NULL, NULL}
     };

     gtype = g_enum_register_static ("GstSpaceScopeStyle", values);
   }
   return gtype;
 }

 static void gst_space_scope_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec);
 static void gst_space_scope_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec);

 static void render_dots (GstAudioVisualizer * base, guint32 * vdata,
     gint16 * adata, guint num_samples);
 static void render_lines (GstAudioVisualizer * base, guint32 * vdata,
     gint16 * adata, guint num_samples);
 static void render_color_dots (GstAudioVisualizer * base, guint32 * vdata,
     gint16 * adata, guint num_samples);
 static void render_color_lines (GstAudioVisualizer * base, guint32 * vdata,
     gint16 * adata, guint num_samples);

 static gboolean gst_space_scope_render (GstAudioVisualizer * scope,
     GstBuffer * audio, GstVideoFrame * video);


 G_DEFINE_TYPE (GstSpaceScope, gst_space_scope, GST_TYPE_AUDIO_VISUALIZER);

 static void
 gst_space_scope_class_init (GstSpaceScopeClass * g_class)
 {
   GObjectClass *gobject_class = (GObjectClass *) g_class;
   GstElementClass *element_class = (GstElementClass *) g_class;
   GstAudioVisualizerClass *scope_class = (GstAudioVisualizerClass *) g_class;

   gst_element_class_set_metadata (element_class, "Stereo visualizer",
       "Visualization",
       "Simple stereo visualizer", "Stefan Kost <ensonic@users.sf.net>");

   gst_element_class_add_pad_template (element_class,
       gst_static_pad_template_get (&gst_space_scope_src_template));
   gst_element_class_add_pad_template (element_class,
       gst_static_pad_template_get (&gst_space_scope_sink_template));

   gobject_class->set_property = gst_space_scope_set_property;
   gobject_class->get_property = gst_space_scope_get_property;

   scope_class->render = GST_DEBUG_FUNCPTR (gst_space_scope_render);

   g_object_class_install_property (gobject_class, PROP_STYLE,
       g_param_spec_enum ("style", "drawing style",
           "Drawing styles for the space scope display.",
           GST_TYPE_SPACE_SCOPE_STYLE, STYLE_DOTS,
           G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 }

 static void
 gst_space_scope_init (GstSpaceScope * scope)
 {
   /* do nothing */
 }

 static void
 gst_space_scope_set_property (GObject * object, guint prop_id,
     const GValue * value, GParamSpec * pspec)
 {
   GstSpaceScope *scope = GST_SPACE_SCOPE (object);

   switch (prop_id) {
     case PROP_STYLE:
       scope->style = g_value_get_enum (value);
       switch (scope->style) {
         case STYLE_DOTS:
           scope->process = render_dots;
           break;
         case STYLE_LINES:
           scope->process = render_lines;
           break;
         case STYLE_COLOR_DOTS:
           scope->process = render_color_dots;
           break;
         case STYLE_COLOR_LINES:
           scope->process = render_color_lines;
           break;
       }
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
 }

 static void
 gst_space_scope_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
   GstSpaceScope *scope = GST_SPACE_SCOPE (object);

   switch (prop_id) {
     case PROP_STYLE:
       g_value_set_enum (value, scope->style);
       break;
     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
   }
 }

 #include "gstdrawhelpers.h"

 static void
 render_dots (GstAudioVisualizer * base, guint32 * vdata, gint16 * adata,
     guint num_samples)
 {
   guint i, s, x, y, ox, oy;
   gfloat dx, dy;
   guint w = GST_VIDEO_INFO_WIDTH (&base->vinfo);
   guint h = GST_VIDEO_INFO_HEIGHT (&base->vinfo);

   /* draw dots 1st channel x, 2nd channel y */
   dx = w / 65536.0;
   ox = w / 2;
   dy = h / 65536.0;
   oy = h / 2;
   s = 0;
   for (i = 0; i < num_samples; i++) {
     x = (guint) (ox + (gfloat) adata[s++] * dx);
     y = (guint) (oy + (gfloat) adata[s++] * dy);
     draw_dot (vdata, x, y, w, 0x00FFFFFF);
   }
 }

 static void
 render_lines (GstAudioVisualizer * base, guint32 * vdata, gint16 * adata,
     guint num_samples)
 {
   guint i, s, x, y, ox, oy;
   gfloat dx, dy;
   guint w = GST_VIDEO_INFO_WIDTH (&base->vinfo);
   guint h = GST_VIDEO_INFO_HEIGHT (&base->vinfo);
   gint x2, y2;

   /* draw lines 1st channel x, 2nd channel y */
   dx = (w - 1) / 65536.0;
   ox = (w - 1) / 2;
   dy = (h - 1) / 65536.0;
   oy = (h - 1) / 2;
   s = 0;
   x2 = (guint) (ox + (gfloat) adata[s++] * dx);
   y2 = (guint) (oy + (gfloat) adata[s++] * dy);
   for (i = 1; i < num_samples; i++) {
     x = (guint) (ox + (gfloat) adata[s++] * dx);
     y = (guint) (oy + (gfloat) adata[s++] * dy);
     draw_line_aa (vdata, x2, x, y2, y, w, 0x00FFFFFF);
     x2 = x;
     y2 = y;
   }
 }

 #define CUTOFF_1 0.15
 #define CUTOFF_2 0.45
 #define RESONANCE (1.0/0.5)

 #define filter(il, ir) G_STMT_START {                                          \
   f1l_h = il - (f1l_m * RESONANCE) - f1l_l;                                    \
   f1l_m += (f1l_h * CUTOFF_1);                                                 \
   f1l_l += (f1l_m * CUTOFF_1);                                                 \
                                                                                \
   f2l_h = (f1l_m + f1l_h) - (f2l_m * RESONANCE) - f2l_l;                       \
   f2l_m += (f2l_h * CUTOFF_2);                                                 \
   f2l_l += (f2l_m * CUTOFF_2);                                                 \
                                                                                \
   f1r_h = ir - (f1r_m * RESONANCE) - f1r_l;                                    \
   f1r_m += (f1r_h * CUTOFF_1);                                                 \
   f1r_l += (f1r_m * CUTOFF_1);                                                 \
                                                                                \
   f2r_h = (f1r_m + f1r_h) - (f2r_m * RESONANCE) - f2r_l;                       \
   f2r_m += (f2r_h * CUTOFF_2);                                                 \
   f2r_l += (f2r_m * CUTOFF_2);                                                 \
 } G_STMT_END

 static void
 render_color_dots (GstAudioVisualizer * base, guint32 * vdata,
     gint16 * adata, guint num_samples)
 {
   GstSpaceScope *scope = (GstSpaceScope *) base;
   guint i, s;
   gint x, y, ox, oy;
   gfloat dx, dy;
   gint w = GST_VIDEO_INFO_WIDTH (&base->vinfo), w1 = w - 2;
   gint h = GST_VIDEO_INFO_HEIGHT (&base->vinfo), h1 = h - 2;
   gdouble il, ir;
   gdouble f1l_l = scope->f1l_l, f1l_m = scope->f1l_m, f1l_h = scope->f1l_h;
   gdouble f1r_l = scope->f1r_l, f1r_m = scope->f1r_m, f1r_h = scope->f1r_h;
   gdouble f2l_l = scope->f2l_l, f2l_m = scope->f2l_m, f2l_h = scope->f2l_h;
   gdouble f2r_l = scope->f2r_l, f2r_m = scope->f2r_m, f2r_h = scope->f2r_h;

   /* draw dots 1st channel x, 2nd channel y */
   ox = w / 2;
   oy = h / 2;
   dx = w / 65536.0;
   dy = h / 65536.0;
   s = 0;
   for (i = 0; i < num_samples; i++) {
     il = (gdouble) adata[s++];
     ir = (gdouble) adata[s++];

     filter (il, ir);

     x = (gint) (ox + f1l_l * dx);
     y = (gint) (oy + f1r_l * dy);
     x = CLAMP (x, 0, w1);
     y = CLAMP (y, 0, h1);
     draw_dot_c (vdata, x, y, w, 0x00FF0000);

     x = (gint) (ox + f2l_l * dx);
     y = (gint) (oy + f2r_l * dy);
     x = CLAMP (x, 0, w1);
     y = CLAMP (y, 0, h1);
     draw_dot_c (vdata, x, y, w, 0x0000FF00);

     x = (gint) (ox + (f2l_m + f2l_h) * dx);
     y = (gint) (oy + (f2r_m + f2r_h) * dy);
     x = CLAMP (x, 0, w1);
     y = CLAMP (y, 0, h1);
     draw_dot_c (vdata, x, y, w, 0x000000FF);
   }

   scope->f1l_l = f1l_l;
   scope->f1l_m = f1l_m;
   scope->f1l_h = f1l_h;
   scope->f1r_l = f1r_l;
   scope->f1r_m = f1r_m;
   scope->f1r_h = f1r_h;
   scope->f2l_l = f2l_l;
   scope->f2l_m = f2l_m;
   scope->f2l_h = f2l_h;
   scope->f2r_l = f2r_l;
   scope->f2r_m = f2r_m;
   scope->f2r_h = f2r_h;
 }

 static void
 render_color_lines (GstAudioVisualizer * base, guint32 * vdata,
     gint16 * adata, guint num_samples)
 {
   GstSpaceScope *scope = (GstSpaceScope *) base;
   guint i, s;
   gint x, y, ox, oy;
   gfloat dx, dy;
   gint w = GST_VIDEO_INFO_WIDTH (&base->vinfo), w1 = w - 2;
   gint h = GST_VIDEO_INFO_HEIGHT (&base->vinfo), h1 = h - 2;
   gdouble il, ir;
   gdouble f1l_l = scope->f1l_l, f1l_m = scope->f1l_m, f1l_h = scope->f1l_h;
   gdouble f1r_l = scope->f1r_l, f1r_m = scope->f1r_m, f1r_h = scope->f1r_h;
   gdouble f2l_l = scope->f2l_l, f2l_m = scope->f2l_m, f2l_h = scope->f2l_h;
   gdouble f2r_l = scope->f2r_l, f2r_m = scope->f2r_m, f2r_h = scope->f2r_h;
   gint x2, y2, x3, y3, x4, y4;

   /* draw lines 1st channel x, 2nd channel y */
   ox = w / 2;
   oy = h / 2;
   dx = w / 65536.0;
   dy = h / 65536.0;
   s = 0;

   /* do first pixels */
   il = (gdouble) adata[s++];
   ir = (gdouble) adata[s++];

   filter (il, ir);

   x = (gint) (ox + f1l_l * dx);
   y = (gint) (oy + f1r_l * dy);
   x2 = CLAMP (x, 0, w1);
   y2 = CLAMP (y, 0, h1);

   x = (gint) (ox + f2l_l * dx);
   y = (gint) (oy + f2r_l * dy);
   x3 = CLAMP (x, 0, w1);
   y3 = CLAMP (y, 0, h1);

   x = (gint) (ox + (f2l_m + f2l_h) * dx);
   y = (gint) (oy + (f2r_m + f2r_h) * dy);
   x4 = CLAMP (x, 0, w1);
   y4 = CLAMP (y, 0, h1);

   for (i = 1; i < num_samples; i++) {
     il = (gdouble) adata[s++];
     ir = (gdouble) adata[s++];

     filter (il, ir);

     x = (gint) (ox + f1l_l * dx);
     y = (gint) (oy + f1r_l * dy);
     x = CLAMP (x, 0, w1);
     y = CLAMP (y, 0, h1);
     draw_line_aa (vdata, x2, x, y2, y, w, 0x00FF0000);
     x2 = x;
     y2 = y;

     x = (gint) (ox + f2l_l * dx);
     y = (gint) (oy + f2r_l * dy);
     x = CLAMP (x, 0, w1);
     y = CLAMP (y, 0, h1);
     draw_line_aa (vdata, x3, x, y3, y, w, 0x0000FF00);
     x3 = x;
     y3 = y;

     x = (gint) (ox + (f2l_m + f2l_h) * dx);
     y = (gint) (oy + (f2r_m + f2r_h) * dy);
     x = CLAMP (x, 0, w1);
     y = CLAMP (y, 0, h1);
     draw_line_aa (vdata, x4, x, y4, y, w, 0x000000FF);
     x4 = x;
     y4 = y;
   }

   scope->f1l_l = f1l_l;
   scope->f1l_m = f1l_m;
   scope->f1l_h = f1l_h;
   scope->f1r_l = f1r_l;
   scope->f1r_m = f1r_m;
   scope->f1r_h = f1r_h;
   scope->f2l_l = f2l_l;
   scope->f2l_m = f2l_m;
   scope->f2l_h = f2l_h;
   scope->f2r_l = f2r_l;
   scope->f2r_m = f2r_m;
   scope->f2r_h = f2r_h;
 }

 static gboolean
 gst_space_scope_render (GstAudioVisualizer * base, GstBuffer * audio,
     GstVideoFrame * video)
 {
   GstSpaceScope *scope = GST_SPACE_SCOPE (base);
   GstMapInfo amap;
   guint num_samples;

   gst_buffer_map (audio, &amap, GST_MAP_READ);

   num_samples =
       amap.size / (GST_AUDIO_INFO_CHANNELS (&base->ainfo) * sizeof (gint16));
   scope->process (base, (guint32 *) GST_VIDEO_FRAME_PLANE_DATA (video, 0),
       (gint16 *) amap.data, num_samples);
   gst_buffer_unmap (audio, &amap);
   return TRUE;
 }

 gboolean
 gst_space_scope_plugin_init (GstPlugin * plugin)
 {
   GST_DEBUG_CATEGORY_INIT (space_scope_debug, "spacescope", 0, "spacescope");

   return gst_element_register (plugin, "spacescope", GST_RANK_NONE,
       GST_TYPE_SPACE_SCOPE);
 }
	/* GStreamer
	* Copyright (C) <2011> Stefan Kost <ensonic@users.sf.net>
	*
	* gstspacescope.c: simple stereo visualizer
	*
	* This program 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.
	*
	* This program 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 this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*/
	/**
	* SECTION:element-spacescope
	* @see_also: goom
	*
	* Spacescope is a simple audio visualisation element. It maps the left and
	* right channel to x and y coordinates.
	*
	* <refsect2>
	* <title>Example launch line</title>
	* \|[
	* gst-launch audiotestsrc ! audioconvert ! spacescope ! ximagesink
	* ]\|
	* </refsect2>
	*/
	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include <stdlib.h>
	#include "gstspacescope.h"

	static GstStaticPadTemplate gst_space_scope_src_template =
	GST_STATIC_PAD_TEMPLATE ("src",
	GST_PAD_SRC,
	GST_PAD_ALWAYS,
	#if G_BYTE_ORDER == G_BIG_ENDIAN
	GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("xRGB"))
	#else
	GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("BGRx"))
	#endif
	);

	static GstStaticPadTemplate gst_space_scope_sink_template =
	GST_STATIC_PAD_TEMPLATE ("sink",
	GST_PAD_SINK,
	GST_PAD_ALWAYS,
	GST_STATIC_CAPS ("audio/x-raw, "
	"format = (string) " GST_AUDIO_NE (S16) ", "
	"layout = (string) interleaved, "
	"rate = (int) [ 8000, 96000 ], "
	"channels = (int) 2, " "channel-mask = (bitmask) 0x3")
	);


	GST_DEBUG_CATEGORY_STATIC (space_scope_debug);
	#define GST_CAT_DEFAULT space_scope_debug

	enum
	{
	PROP_0,
	PROP_STYLE
	};

	enum
	{
	STYLE_DOTS = 0,
	STYLE_LINES,
	STYLE_COLOR_DOTS,
	STYLE_COLOR_LINES,
	NUM_STYLES
	};

	#define GST_TYPE_SPACE_SCOPE_STYLE (gst_space_scope_style_get_type ())
	static GType
	gst_space_scope_style_get_type (void)
	{
	static GType gtype = 0;

	if (gtype == 0) {
	static const GEnumValue values[] = {
	{STYLE_DOTS, "draw dots (default)", "dots"},
	{STYLE_LINES, "draw lines", "lines"},
	{STYLE_COLOR_DOTS, "draw color dots", "color-dots"},
	{STYLE_COLOR_LINES, "draw color lines", "color-lines"},
	{0, NULL, NULL}
	};

	gtype = g_enum_register_static ("GstSpaceScopeStyle", values);
	}
	return gtype;
	}

	static void gst_space_scope_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec);
	static void gst_space_scope_get_property (GObject * object, guint prop_id,
	GValue * value, GParamSpec * pspec);

	static void render_dots (GstAudioVisualizer * base, guint32 * vdata,
	gint16 * adata, guint num_samples);
	static void render_lines (GstAudioVisualizer * base, guint32 * vdata,
	gint16 * adata, guint num_samples);
	static void render_color_dots (GstAudioVisualizer * base, guint32 * vdata,
	gint16 * adata, guint num_samples);
	static void render_color_lines (GstAudioVisualizer * base, guint32 * vdata,
	gint16 * adata, guint num_samples);

	static gboolean gst_space_scope_render (GstAudioVisualizer * scope,
	GstBuffer * audio, GstVideoFrame * video);


	G_DEFINE_TYPE (GstSpaceScope, gst_space_scope, GST_TYPE_AUDIO_VISUALIZER);

	static void
	gst_space_scope_class_init (GstSpaceScopeClass * g_class)
	{
	GObjectClass gobject_class = (GObjectClass ) g_class;
	GstElementClass element_class = (GstElementClass ) g_class;
	GstAudioVisualizerClass scope_class = (GstAudioVisualizerClass ) g_class;

	gst_element_class_set_metadata (element_class, "Stereo visualizer",
	"Visualization",
	"Simple stereo visualizer", "Stefan Kost <ensonic@users.sf.net>");

	gst_element_class_add_pad_template (element_class,
	gst_static_pad_template_get (&gst_space_scope_src_template));
	gst_element_class_add_pad_template (element_class,
	gst_static_pad_template_get (&gst_space_scope_sink_template));

	gobject_class->set_property = gst_space_scope_set_property;
	gobject_class->get_property = gst_space_scope_get_property;

	scope_class->render = GST_DEBUG_FUNCPTR (gst_space_scope_render);

	g_object_class_install_property (gobject_class, PROP_STYLE,
	g_param_spec_enum ("style", "drawing style",
	"Drawing styles for the space scope display.",
	GST_TYPE_SPACE_SCOPE_STYLE, STYLE_DOTS,
	G_PARAM_CONSTRUCT \| G_PARAM_READWRITE \| G_PARAM_STATIC_STRINGS));
	}

	static void
	gst_space_scope_init (GstSpaceScope * scope)
	{
	/* do nothing */
	}

	static void
	gst_space_scope_set_property (GObject * object, guint prop_id,
	const GValue * value, GParamSpec * pspec)
	{
	GstSpaceScope *scope = GST_SPACE_SCOPE (object);

	switch (prop_id) {
	case PROP_STYLE:
	scope->style = g_value_get_enum (value);
	switch (scope->style) {
	case STYLE_DOTS:
	scope->process = render_dots;
	break;
	case STYLE_LINES:
	scope->process = render_lines;
	break;
	case STYLE_COLOR_DOTS:
	scope->process = render_color_dots;
	break;
	case STYLE_COLOR_LINES:
	scope->process = render_color_lines;
	break;
	}
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static void
	gst_space_scope_get_property (GObject * object, guint prop_id,
	GValue * value, GParamSpec * pspec)
	{
	GstSpaceScope *scope = GST_SPACE_SCOPE (object);

	switch (prop_id) {
	case PROP_STYLE:
	g_value_set_enum (value, scope->style);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	#include "gstdrawhelpers.h"

	static void
	render_dots (GstAudioVisualizer * base, guint32 * vdata, gint16 * adata,
	guint num_samples)
	{
	guint i, s, x, y, ox, oy;
	gfloat dx, dy;
	guint w = GST_VIDEO_INFO_WIDTH (&base->vinfo);
	guint h = GST_VIDEO_INFO_HEIGHT (&base->vinfo);

	/* draw dots 1st channel x, 2nd channel y */
	dx = w / 65536.0;
	ox = w / 2;
	dy = h / 65536.0;
	oy = h / 2;
	s = 0;
	for (i = 0; i < num_samples; i++) {
	x = (guint) (ox + (gfloat) adata[s++] * dx);
	y = (guint) (oy + (gfloat) adata[s++] * dy);
	draw_dot (vdata, x, y, w, 0x00FFFFFF);
	}
	}

	static void
	render_lines (GstAudioVisualizer * base, guint32 * vdata, gint16 * adata,
	guint num_samples)
	{
	guint i, s, x, y, ox, oy;
	gfloat dx, dy;
	guint w = GST_VIDEO_INFO_WIDTH (&base->vinfo);
	guint h = GST_VIDEO_INFO_HEIGHT (&base->vinfo);
	gint x2, y2;

	/* draw lines 1st channel x, 2nd channel y */
	dx = (w - 1) / 65536.0;
	ox = (w - 1) / 2;
	dy = (h - 1) / 65536.0;
	oy = (h - 1) / 2;
	s = 0;
	x2 = (guint) (ox + (gfloat) adata[s++] * dx);
	y2 = (guint) (oy + (gfloat) adata[s++] * dy);
	for (i = 1; i < num_samples; i++) {
	x = (guint) (ox + (gfloat) adata[s++] * dx);
	y = (guint) (oy + (gfloat) adata[s++] * dy);
	draw_line_aa (vdata, x2, x, y2, y, w, 0x00FFFFFF);
	x2 = x;
	y2 = y;
	}
	}

	#define CUTOFF_1 0.15
	#define CUTOFF_2 0.45
	#define RESONANCE (1.0/0.5)

	#define filter(il, ir) G_STMT_START { \
	f1l_h = il - (f1l_m * RESONANCE) - f1l_l; \
	f1l_m += (f1l_h * CUTOFF_1); \
	f1l_l += (f1l_m * CUTOFF_1); \
	\
	f2l_h = (f1l_m + f1l_h) - (f2l_m * RESONANCE) - f2l_l; \
	f2l_m += (f2l_h * CUTOFF_2); \
	f2l_l += (f2l_m * CUTOFF_2); \
	\
	f1r_h = ir - (f1r_m * RESONANCE) - f1r_l; \
	f1r_m += (f1r_h * CUTOFF_1); \
	f1r_l += (f1r_m * CUTOFF_1); \
	\
	f2r_h = (f1r_m + f1r_h) - (f2r_m * RESONANCE) - f2r_l; \
	f2r_m += (f2r_h * CUTOFF_2); \
	f2r_l += (f2r_m * CUTOFF_2); \
	} G_STMT_END

	static void
	render_color_dots (GstAudioVisualizer * base, guint32 * vdata,
	gint16 * adata, guint num_samples)
	{
	GstSpaceScope scope = (GstSpaceScope ) base;
	guint i, s;
	gint x, y, ox, oy;
	gfloat dx, dy;
	gint w = GST_VIDEO_INFO_WIDTH (&base->vinfo), w1 = w - 2;
	gint h = GST_VIDEO_INFO_HEIGHT (&base->vinfo), h1 = h - 2;
	gdouble il, ir;
	gdouble f1l_l = scope->f1l_l, f1l_m = scope->f1l_m, f1l_h = scope->f1l_h;
	gdouble f1r_l = scope->f1r_l, f1r_m = scope->f1r_m, f1r_h = scope->f1r_h;
	gdouble f2l_l = scope->f2l_l, f2l_m = scope->f2l_m, f2l_h = scope->f2l_h;
	gdouble f2r_l = scope->f2r_l, f2r_m = scope->f2r_m, f2r_h = scope->f2r_h;

	/* draw dots 1st channel x, 2nd channel y */
	ox = w / 2;
	oy = h / 2;
	dx = w / 65536.0;
	dy = h / 65536.0;
	s = 0;
	for (i = 0; i < num_samples; i++) {
	il = (gdouble) adata[s++];
	ir = (gdouble) adata[s++];

	filter (il, ir);

	x = (gint) (ox + f1l_l * dx);
	y = (gint) (oy + f1r_l * dy);
	x = CLAMP (x, 0, w1);
	y = CLAMP (y, 0, h1);
	draw_dot_c (vdata, x, y, w, 0x00FF0000);

	x = (gint) (ox + f2l_l * dx);
	y = (gint) (oy + f2r_l * dy);
	x = CLAMP (x, 0, w1);
	y = CLAMP (y, 0, h1);
	draw_dot_c (vdata, x, y, w, 0x0000FF00);

	x = (gint) (ox + (f2l_m + f2l_h) * dx);
	y = (gint) (oy + (f2r_m + f2r_h) * dy);
	x = CLAMP (x, 0, w1);
	y = CLAMP (y, 0, h1);
	draw_dot_c (vdata, x, y, w, 0x000000FF);
	}

	scope->f1l_l = f1l_l;
	scope->f1l_m = f1l_m;
	scope->f1l_h = f1l_h;
	scope->f1r_l = f1r_l;
	scope->f1r_m = f1r_m;
	scope->f1r_h = f1r_h;
	scope->f2l_l = f2l_l;
	scope->f2l_m = f2l_m;
	scope->f2l_h = f2l_h;
	scope->f2r_l = f2r_l;
	scope->f2r_m = f2r_m;
	scope->f2r_h = f2r_h;
	}

	static void
	render_color_lines (GstAudioVisualizer * base, guint32 * vdata,
	gint16 * adata, guint num_samples)
	{
	GstSpaceScope scope = (GstSpaceScope ) base;
	guint i, s;
	gint x, y, ox, oy;
	gfloat dx, dy;
	gint w = GST_VIDEO_INFO_WIDTH (&base->vinfo), w1 = w - 2;
	gint h = GST_VIDEO_INFO_HEIGHT (&base->vinfo), h1 = h - 2;
	gdouble il, ir;
	gdouble f1l_l = scope->f1l_l, f1l_m = scope->f1l_m, f1l_h = scope->f1l_h;
	gdouble f1r_l = scope->f1r_l, f1r_m = scope->f1r_m, f1r_h = scope->f1r_h;
	gdouble f2l_l = scope->f2l_l, f2l_m = scope->f2l_m, f2l_h = scope->f2l_h;
	gdouble f2r_l = scope->f2r_l, f2r_m = scope->f2r_m, f2r_h = scope->f2r_h;
	gint x2, y2, x3, y3, x4, y4;

	/* draw lines 1st channel x, 2nd channel y */
	ox = w / 2;
	oy = h / 2;
	dx = w / 65536.0;
	dy = h / 65536.0;
	s = 0;

	/* do first pixels */
	il = (gdouble) adata[s++];
	ir = (gdouble) adata[s++];

	filter (il, ir);

	x = (gint) (ox + f1l_l * dx);
	y = (gint) (oy + f1r_l * dy);
	x2 = CLAMP (x, 0, w1);
	y2 = CLAMP (y, 0, h1);

	x = (gint) (ox + f2l_l * dx);
	y = (gint) (oy + f2r_l * dy);
	x3 = CLAMP (x, 0, w1);
	y3 = CLAMP (y, 0, h1);

	x = (gint) (ox + (f2l_m + f2l_h) * dx);
	y = (gint) (oy + (f2r_m + f2r_h) * dy);
	x4 = CLAMP (x, 0, w1);
	y4 = CLAMP (y, 0, h1);

	for (i = 1; i < num_samples; i++) {
	il = (gdouble) adata[s++];
	ir = (gdouble) adata[s++];

	filter (il, ir);

	x = (gint) (ox + f1l_l * dx);
	y = (gint) (oy + f1r_l * dy);
	x = CLAMP (x, 0, w1);
	y = CLAMP (y, 0, h1);
	draw_line_aa (vdata, x2, x, y2, y, w, 0x00FF0000);
	x2 = x;
	y2 = y;

	x = (gint) (ox + f2l_l * dx);
	y = (gint) (oy + f2r_l * dy);
	x = CLAMP (x, 0, w1);
	y = CLAMP (y, 0, h1);
	draw_line_aa (vdata, x3, x, y3, y, w, 0x0000FF00);
	x3 = x;
	y3 = y;

	x = (gint) (ox + (f2l_m + f2l_h) * dx);
	y = (gint) (oy + (f2r_m + f2r_h) * dy);
	x = CLAMP (x, 0, w1);
	y = CLAMP (y, 0, h1);
	draw_line_aa (vdata, x4, x, y4, y, w, 0x000000FF);
	x4 = x;
	y4 = y;
	}

	scope->f1l_l = f1l_l;
	scope->f1l_m = f1l_m;
	scope->f1l_h = f1l_h;
	scope->f1r_l = f1r_l;
	scope->f1r_m = f1r_m;
	scope->f1r_h = f1r_h;
	scope->f2l_l = f2l_l;
	scope->f2l_m = f2l_m;
	scope->f2l_h = f2l_h;
	scope->f2r_l = f2r_l;
	scope->f2r_m = f2r_m;
	scope->f2r_h = f2r_h;
	}

	static gboolean
	gst_space_scope_render (GstAudioVisualizer * base, GstBuffer * audio,
	GstVideoFrame * video)
	{
	GstSpaceScope *scope = GST_SPACE_SCOPE (base);
	GstMapInfo amap;
	guint num_samples;

	gst_buffer_map (audio, &amap, GST_MAP_READ);

	num_samples =
	amap.size / (GST_AUDIO_INFO_CHANNELS (&base->ainfo) * sizeof (gint16));
	scope->process (base, (guint32 *) GST_VIDEO_FRAME_PLANE_DATA (video, 0),
	(gint16 *) amap.data, num_samples);
	gst_buffer_unmap (audio, &amap);
	return TRUE;
	}

	gboolean
	gst_space_scope_plugin_init (GstPlugin * plugin)
	{
	GST_DEBUG_CATEGORY_INIT (space_scope_debug, "spacescope", 0, "spacescope");

	return gst_element_register (plugin, "spacescope", GST_RANK_NONE,
	GST_TYPE_SPACE_SCOPE);
	}