Text test source element

[Stefan Sauer]

On 06/14/2012 04:44 PM, iron_guitarist1987 wrote:
> Hello,
>
> I'm trying to create the simplest text source element that outputs the same
> string over and over again. I tried doing something with the audiotestsrc,
> but I know is wrong. Below is what I have so far. Any ideas?

https://bugzilla.gnome.org/show_bug.cgi?id=657684

Stefan
>
> thanks
>
>
>
> /* GStreamer
>  * Copyright (C) 2005 Stefan Kost <ensonic at users.sf.net>
>  *
>  * This library is free software; you can redistribute it and/or
>  * modify it under the terms of the GNU Library General Public
>  * License as published by the Free Software Foundation; either
>  * version 2 of the License, or (at your option) any later version.
>  *
>  * This library 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
>  * Library General Public License for more details.
>  *
>  * You should have received a copy of the GNU Library General Public
>  * License along with this library; if not, write to the
>  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
>  * Boston, MA 02111-1307, USA.
>  */
> /**
>  * SECTION:element-texttestsrc
>  *
>  * Texttestsrc can be used to generate basic strings. 
>  */
>
> #ifdef HAVE_CONFIG_H
> #include "config.h"
> #endif
>
> #include <stdlib.h>
> #include <string.h>
> #include <gst/controller/gstcontroller.h>
>
> #include "texttestsrc.h"
>
>
> GST_DEBUG_CATEGORY_STATIC (text_test_src_debug);
> #define GST_CAT_DEFAULT text_test_src_debug
>
>
> enum
> {
>   PROP_0,
>   PROP_LAST
> };
>
>
> static GstStaticPadTemplate gst_text_test_src_src_template =
>     GST_STATIC_PAD_TEMPLATE ("src",
>     GST_PAD_SRC,
>     GST_PAD_ALWAYS,
>     GST_STATIC_CAPS ("text/plain")
>     );
>
>
> GST_BOILERPLATE (GstTexttestsrc, gst_text_test_src, GstBaseSrc,
>     GST_TYPE_BASE_SRC);
>
> #define GST_TYPE_TEXT_TEST_SRC_WAVE (gst_audiostestsrc_wave_get_type())
>
>
>
> static void gst_text_test_src_set_property (GObject * object,
>     guint prop_id, const GValue * value, GParamSpec * pspec);
> static void gst_text_test_src_get_property (GObject * object,
>     guint prop_id, GValue * value, GParamSpec * pspec);
>
>
> static GstFlowReturn gst_text_test_src_create (GstBaseSrc * basesrc,
>     guint64 offset, guint length, GstBuffer ** buffer);
>
>
> static void
> gst_text_test_src_base_init (gpointer g_class)
> {
>   GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
>
>   gst_element_class_add_pad_template (element_class,
>       gst_static_pad_template_get (&gst_text_test_src_src_template));
>   gst_element_class_set_details_simple (element_class,
>       "Audio test source", "Source/Audio",
>       "Creates audio test signals of given frequency and volume",
>       "Stefan Kost <ensonic at users.sf.net>");
> }
>
> static void
> gst_text_test_src_class_init (GstTexttestsrcClass * klass)
> {
>   GObjectClass *gobject_class;
>   GstBaseSrcClass *gstbasesrc_class;
>
>   gobject_class = (GObjectClass *) klass;
>   gstbasesrc_class = (GstBaseSrcClass *) klass;
>
>   gobject_class->set_property = gst_text_test_src_set_property;
>   gobject_class->get_property = gst_text_test_src_get_property;
>
>
>   gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_text_test_src_create);
> }
>
> static void
> gst_text_test_src_init (GstTexttestsrc * src, GstTexttestsrcClass * g_class)
> {
>   GstPad *pad = GST_BASE_SRC_PAD (src);
>
>
>   /* we operate in time */
>   gst_base_src_set_format (GST_BASE_SRC (src), GST_FORMAT_TIME);
>   gst_base_src_set_blocksize (GST_BASE_SRC (src), -1);
> }
>
> static gboolean
> gst_text_test_src_stop (GstBaseSrc * basesrc)
> {
>   return TRUE;
> }
>
>
> static GstFlowReturn
> gst_text_test_src_create (GstBaseSrc * basesrc, guint64 offset,
>     guint length, GstBuffer ** buffer)
> {
>   GstFlowReturn res;
>   GstTexttestsrc *src;
>   src = GST_TEXT_TEST_SRC (basesrc);
>
>   *buffer = "This is my test string";
>
>   return GST_FLOW_OK;
> }
>
> static void
> gst_text_test_src_set_property (GObject * object, guint prop_id,
>     const GValue * value, GParamSpec * pspec)
> {
>   GstTexttestsrc *src = GST_TEXT_TEST_SRC (object);
>
>   switch (prop_id) {
>     default:
>       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
>       break;
>   }
> }
>
> static void
> gst_text_test_src_get_property (GObject * object, guint prop_id,
>     GValue * value, GParamSpec * pspec)
> {
>   GstTexttestsrc *src = GST_TEXT_TEST_SRC (object);
>
>   switch (prop_id) {
>     default:
>       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
>       break;
>   }
> }
>
> static gboolean
> plugin_init (GstPlugin * plugin)
> {
>   /* initialize gst controller library */
>   gst_controller_init (NULL, NULL);
>
>   GST_DEBUG_CATEGORY_INIT (text_test_src_debug, "texttestsrc", 0,
>       "Text Test Source");
>
>   return gst_element_register (plugin, "texttestsrc",
>       GST_RANK_NONE, GST_TYPE_TEXT_TEST_SRC);
> }
>
> GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
>     GST_VERSION_MINOR,
>     "texttestsrc",
>     "Creates test string",
>     plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
>
>
> -----
> The greatest trick the devil ever pulled was convincing the World that Java was better than C++.
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/Text-test-source-element-tp4655287.html
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