1 files changed, 138 insertions, 0 deletions
diff --git a/gst/audiovisualizers/gstwavescope.c b/gst/audiovisualizers/gstwavescope.c
new file mode 100644
index 000000000..b009e334d
--- /dev/null
+++ b/gst/audiovisualizers/gstwavescope.c
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+/* 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_setup (GstBaseScope * scope);
+static gboolean gst_wave_scope_render (GstBaseScope * scope, GstBuffer * audio,
+    GstBuffer * video);
+
+
+GST_BOILERPLATE (GstWaveScope, gst_wave_scope, GstBaseScope,
+    GST_TYPE_BASE_SCOPE);
+
+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)
+{
+  /*GObjectClass *gobject_class = (GObjectClass *) g_class; */
+  GstBaseScopeClass *scope_class = (GstBaseScopeClass *) g_class;
+
+  scope_class->setup = GST_DEBUG_FUNCPTR (gst_wave_scope_setup);
+  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_setup (GstBaseScope * scope)
+{
+  return TRUE;
+}
+
+static gboolean
+gst_wave_scope_render (GstBaseScope * 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);
+}