mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-20 23:36:38 +00:00
130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
/* GStreamer
|
|
* Copyright (C) <2011> Stefan Kost <ensonic@users.sf.net>
|
|
*
|
|
* gstwavescope.c: simple oscilloscope
|
|
*
|
|
* 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-wavescope
|
|
* @see_also: goom
|
|
*
|
|
* Wavescope is a simple audio visualisation element. It renders the waveforms
|
|
* like on an oscilloscope.
|
|
*
|
|
* <refsect2>
|
|
* <title>Example launch line</title>
|
|
* |[
|
|
* gst-launch audiotestsrc ! audioconvert ! wavescope ! ximagesink
|
|
* ]|
|
|
* </refsect2>
|
|
*/
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "gstwavescope.h"
|
|
|
|
static GstStaticPadTemplate gst_wave_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_wave_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 (wave_scope_debug);
|
|
#define GST_CAT_DEFAULT wave_scope_debug
|
|
|
|
static gboolean gst_wave_scope_render (GstBaseAudioVisualizer * scope,
|
|
GstBuffer * audio, GstBuffer * video);
|
|
|
|
|
|
GST_BOILERPLATE (GstWaveScope, gst_wave_scope, GstBaseAudioVisualizer,
|
|
GST_TYPE_BASE_AUDIO_VISUALIZER);
|
|
|
|
static void
|
|
gst_wave_scope_base_init (gpointer g_class)
|
|
{
|
|
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
|
|
|
|
gst_element_class_set_details_simple (element_class, "Waveform oscilloscope",
|
|
"Visualization",
|
|
"Simple waveform oscilloscope", "Stefan Kost <ensonic@users.sf.net>");
|
|
|
|
gst_element_class_add_pad_template (element_class,
|
|
gst_static_pad_template_get (&gst_wave_scope_src_template));
|
|
gst_element_class_add_pad_template (element_class,
|
|
gst_static_pad_template_get (&gst_wave_scope_sink_template));
|
|
}
|
|
|
|
static void
|
|
gst_wave_scope_class_init (GstWaveScopeClass * g_class)
|
|
{
|
|
GstBaseAudioVisualizerClass *scope_class =
|
|
(GstBaseAudioVisualizerClass *) g_class;
|
|
|
|
scope_class->render = GST_DEBUG_FUNCPTR (gst_wave_scope_render);
|
|
}
|
|
|
|
static void
|
|
gst_wave_scope_init (GstWaveScope * scope, GstWaveScopeClass * g_class)
|
|
{
|
|
/* do nothing */
|
|
}
|
|
|
|
static gboolean
|
|
gst_wave_scope_render (GstBaseAudioVisualizer * scope, GstBuffer * audio,
|
|
GstBuffer * video)
|
|
{
|
|
guint32 *vdata = (guint32 *) GST_BUFFER_DATA (video);
|
|
gint16 *adata = (gint16 *) GST_BUFFER_DATA (audio);
|
|
guint i, c, s, x, y, off, oy;
|
|
guint num_samples;
|
|
gfloat dx, dy;
|
|
guint w = scope->width;
|
|
|
|
/* draw dots */
|
|
num_samples = GST_BUFFER_SIZE (audio) / (scope->channels * sizeof (gint16));
|
|
dx = (gfloat) scope->width / (gfloat) num_samples;
|
|
dy = scope->height / 65536.0;
|
|
oy = scope->height / 2;
|
|
s = 0;
|
|
for (i = 0; i < num_samples; i++) {
|
|
x = (guint) ((gfloat) i * dx);
|
|
for (c = 0; c < scope->channels; c++) {
|
|
y = (guint) (oy + (gfloat) adata[s++] * dy);
|
|
off = (y * w) + x;
|
|
vdata[off] = 0x00FFFFFF;
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
gboolean
|
|
gst_wave_scope_plugin_init (GstPlugin * plugin)
|
|
{
|
|
GST_DEBUG_CATEGORY_INIT (wave_scope_debug, "wavescope", 0, "wavescope");
|
|
|
|
return gst_element_register (plugin, "wavescope", GST_RANK_NONE,
|
|
GST_TYPE_WAVE_SCOPE);
|
|
}
|