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/* 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 "gstspacescope.h"
static GstStaticPadTemplate gst_space_scope_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_xRGB_HOST_ENDIAN)
);
static GstStaticPadTemplate gst_space_scope_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_AUDIO_INT_STANDARD_PAD_TEMPLATE_CAPS)
);
GST_DEBUG_CATEGORY_STATIC (space_scope_debug);
#define GST_CAT_DEFAULT space_scope_debug
static gboolean gst_space_scope_render (GstBaseAudioVisualizer * scope,
GstBuffer * audio, GstBuffer * video);
GST_BOILERPLATE (GstSpaceScope, gst_space_scope, GstBaseAudioVisualizer,
GST_TYPE_BASE_AUDIO_VISUALIZER);
static void
gst_space_scope_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (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));
}
static void
gst_space_scope_class_init (GstSpaceScopeClass * g_class)
{
GstBaseAudioVisualizerClass *scope_class =
(GstBaseAudioVisualizerClass *) g_class;
scope_class->render = GST_DEBUG_FUNCPTR (gst_space_scope_render);
}
static void
gst_space_scope_init (GstSpaceScope * scope, GstSpaceScopeClass * g_class)
{
/* do nothing */
}
static gboolean
gst_space_scope_render (GstBaseAudioVisualizer * scope, GstBuffer * audio,
GstBuffer * video)
{
guint32 *vdata = (guint32 *) GST_BUFFER_DATA (video);
gint16 *adata = (gint16 *) GST_BUFFER_DATA (audio);
guint i, s, x, y, off, ox, oy;
guint num_samples;
gfloat dx, dy;
guint w = scope->width;
/* draw dots 1st channel x, 2nd channel y */
num_samples = GST_BUFFER_SIZE (audio) / (scope->channels * sizeof (gint16));
dx = scope->width / 65536.0;
ox = scope->width / 2;
dy = scope->height / 65536.0;
oy = scope->height / 2;
s = 0;
for (i = 0; i < num_samples; i++) {
x = (guint) (ox + (gfloat) adata[s++] * dx);
y = (guint) (oy + (gfloat) adata[s++] * dy);
off = (y * w) + x;
vdata[off] = 0x00FFFFFF;
}
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);
}
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