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139 lines
3.9 KiB
C
139 lines
3.9 KiB
C
/* GStreamer
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* Copyright (C) <2011> Stefan Kost <ensonic@users.sf.net>
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*
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* gstwavescope.c: simple oscilloscope
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-wavescope
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* @see_also: goom
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*
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* Wavescope is a simple audio visualisation element. It renders the waveforms
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* like on an oscilloscope.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch audiotestsrc ! audioconvert ! wavescope ! ximagesink
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* ]|
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* </refsect2>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstwavescope.h"
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static GstStaticPadTemplate gst_wave_scope_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_xRGB_HOST_ENDIAN)
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);
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static GstStaticPadTemplate gst_wave_scope_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_AUDIO_INT_STANDARD_PAD_TEMPLATE_CAPS)
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);
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GST_DEBUG_CATEGORY_STATIC (wave_scope_debug);
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#define GST_CAT_DEFAULT wave_scope_debug
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static gboolean gst_wave_scope_setup (GstBaseScope * scope);
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static gboolean gst_wave_scope_render (GstBaseScope * scope, GstBuffer * audio,
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GstBuffer * video);
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GST_BOILERPLATE (GstWaveScope, gst_wave_scope, GstBaseScope,
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GST_TYPE_BASE_SCOPE);
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static void
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gst_wave_scope_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details_simple (element_class, "Waveform oscilloscope",
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"Visualization",
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"Simple waveform oscilloscope", "Stefan Kost <ensonic@users.sf.net>");
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_wave_scope_src_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_wave_scope_sink_template));
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}
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static void
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gst_wave_scope_class_init (GstWaveScopeClass * g_class)
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{
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/*GObjectClass *gobject_class = (GObjectClass *) g_class; */
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GstBaseScopeClass *scope_class = (GstBaseScopeClass *) g_class;
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scope_class->setup = GST_DEBUG_FUNCPTR (gst_wave_scope_setup);
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scope_class->render = GST_DEBUG_FUNCPTR (gst_wave_scope_render);
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}
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static void
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gst_wave_scope_init (GstWaveScope * scope, GstWaveScopeClass * g_class)
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{
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/* do nothing */
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}
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static gboolean
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gst_wave_scope_setup (GstBaseScope * scope)
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{
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return TRUE;
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}
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static gboolean
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gst_wave_scope_render (GstBaseScope * scope, GstBuffer * audio,
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GstBuffer * video)
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{
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guint32 *vdata = (guint32 *) GST_BUFFER_DATA (video);
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gint16 *adata = (gint16 *) GST_BUFFER_DATA (audio);
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guint i, c, s, x, y, off, oy;
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guint num_samples;
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gfloat dx, dy;
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guint w = scope->width;
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/* draw dots */
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num_samples = GST_BUFFER_SIZE (audio) / (scope->channels * sizeof (gint16));
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dx = (gfloat) scope->width / (gfloat) num_samples;
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dy = scope->height / 65536.0;
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oy = scope->height / 2;
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s = 0;
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for (i = 0; i < num_samples; i++) {
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x = (guint) ((gfloat) i * dx);
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for (c = 0; c < scope->channels; c++) {
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y = (guint) (oy + (gfloat) adata[s++] * dy);
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off = (y * w) + x;
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vdata[off] = 0x00FFFFFF;
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}
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}
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return TRUE;
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}
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gboolean
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gst_wave_scope_plugin_init (GstPlugin * plugin)
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{
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GST_DEBUG_CATEGORY_INIT (wave_scope_debug, "wavescope", 0, "wavescope");
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return gst_element_register (plugin, "wavescope", GST_RANK_NONE,
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GST_TYPE_WAVE_SCOPE);
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}
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