gstreamer/gst/autodetect/gstautoaudiosrc.c

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/* GStreamer
* (c) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* (c) 2006 Jan Schmidt <thaytan@noraisin.net>
* (c) 2008 Stefan Kost <ensonic@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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-autoaudiosrc
* @see_also: autovideosrc, alsasrc, osssrc
*
* autoaudiosrc is an audio source that automatically detects an appropriate
* audio source to use. It does so by scanning the registry for all elements
* that have <quote>Source</quote> and <quote>Audio</quote> in the class field
* of their element information, and also have a non-zero autoplugging rank.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 -v -m autoaudiosrc ! audioconvert ! audioresample ! autoaudiosink
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstautoaudiosrc.h"
G_DEFINE_TYPE (GstAutoAudioSrc, gst_auto_audio_src, GST_TYPE_AUTO_DETECT);
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstElement *
gst_auto_audio_src_create_fake_element (GstAutoDetect * autodetect)
{
GstElement *fake;
fake = gst_element_factory_make ("audiotestsrc", "fake-auto-audio-src");
if (fake != NULL) {
g_object_set (fake, "is-live", TRUE, NULL);
gst_util_set_object_arg (G_OBJECT (fake), "wave", "silence");
} else {
GST_ELEMENT_ERROR (autodetect, RESOURCE, NOT_FOUND,
("Failed to find usable audio source element."),
("Failed to find a usable audio source and couldn't create an audio"
"testsrc as fallback either, check your GStreamer installation."));
/* This will error out with not-negotiated.. */
fake = gst_element_factory_make ("fakesrc", "fake-auto-audio-src");
}
return fake;
}
static void
gst_auto_audio_src_class_init (GstAutoAudioSrcClass * klass)
{
GstAutoDetectClass *autoclass = GST_AUTO_DETECT_CLASS (klass);
GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_static_pad_template (eklass, &src_template);
gst_element_class_set_static_metadata (eklass, "Auto audio source",
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"Source/Audio",
"Wrapper audio source for automatically detected audio source",
"Jan Schmidt <thaytan@noraisin.net>, "
"Stefan Kost <ensonic@users.sf.net>");
autoclass->create_fake_element = gst_auto_audio_src_create_fake_element;
}
static void
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gst_auto_audio_src_init (GstAutoAudioSrc * src)
{
GstAutoDetect *autodetect = GST_AUTO_DETECT (src);
autodetect->media_klass = "Audio";
autodetect->flag = GST_ELEMENT_FLAG_SOURCE;
}