gstreamer/gst/autoconvert/gstautovideoconvert.c

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/* GStreamer
* Copyright 2010 ST-Ericsson SA
* @author: Benjamin Gaignard <benjamin.gaignard@stericsson.com>
*
* 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.
*/
/*
* test autovideoconvert:
* if rgb2bayer is present
* gst-launch-1.0 videotestsrc num-buffers=2 ! "video/x-raw,width=100,height=100,framerate=10/1" ! autovideoconvert ! "video/x-bayer,width=100,height=100,format=bggr,framerate=10/1" ! fakesink -v
* if bayer2rgb is present
* gst-launch-1.0 videotestsrc num-buffers=2 ! "video/x-bayer,width=100,height=100,format=bggr,framerate=10/1" ! autovideoconvert ! "video/x-raw,width=100,height=100,framerate=10/1" ! fakesink -v
* test with videoconvert
* gst-launch-1.0 videotestsrc num-buffers=2 ! "video/x-raw,format=RGBx,width=100,height=100,framerate=10/1" ! autovideoconvert ! "video/x-raw,format=RGB16,width=100,height=100,framerate=10/1" ! fakesink -v
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstautovideoconvert.h"
GST_DEBUG_CATEGORY (autovideoconvert_debug);
#define GST_CAT_DEFAULT (autovideoconvert_debug)
static GMutex factories_mutex;
static guint32 factories_cookie = 0; /* Cookie from last time when factories was updated */
static GList *factories = NULL; /* factories we can use for selecting elements */
/* element factory information */
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStateChangeReturn gst_auto_video_convert_change_state (GstElement *
element, GstStateChange transition);
void gst_auto_video_convert_update_factory_list (GstAutoVideoConvert *
autovideoconvert);
static gboolean
gst_auto_video_convert_element_filter (GstPluginFeature * feature,
GstAutoVideoConvert * autovideoconvert)
{
const gchar *klass;
/* we only care about element factories */
if (G_UNLIKELY (!GST_IS_ELEMENT_FACTORY (feature)))
return FALSE;
klass = gst_element_factory_get_metadata (GST_ELEMENT_FACTORY_CAST (feature),
GST_ELEMENT_METADATA_KLASS);
/* only select color space converter */
if (strstr (klass, "Filter") &&
strstr (klass, "Converter") && strstr (klass, "Video")) {
GST_DEBUG_OBJECT (autovideoconvert,
"gst_auto_video_convert_element_filter found %s",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST (feature)));
return TRUE;
}
return FALSE;
}
static GList *
gst_auto_video_convert_create_factory_list (GstAutoVideoConvert *
autovideoconvert)
{
GList *result = NULL;
/* get the feature list using the filter */
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result = gst_registry_feature_filter (gst_registry_get (),
(GstPluginFeatureFilter) gst_auto_video_convert_element_filter,
FALSE, autovideoconvert);
/* sort on rank and name */
result = g_list_sort (result, gst_plugin_feature_rank_compare_func);
return result;
}
void
gst_auto_video_convert_update_factory_list (GstAutoVideoConvert *
autovideoconvert)
{
/* use a static mutex to protect factories list and factories cookie */
g_mutex_lock (&factories_mutex);
/* test if a factories list already exist or not */
if (!factories) {
/* no factories list create it */
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factories_cookie =
gst_registry_get_feature_list_cookie (gst_registry_get ());
factories = gst_auto_video_convert_create_factory_list (autovideoconvert);
} else {
/* a factories list exist but is it up to date? */
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if (factories_cookie !=
gst_registry_get_feature_list_cookie (gst_registry_get ())) {
/* we need to update the factories list */
/* first free the old one */
gst_plugin_feature_list_free (factories);
/* then create an updated one */
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factories_cookie =
gst_registry_get_feature_list_cookie (gst_registry_get ());
factories = gst_auto_video_convert_create_factory_list (autovideoconvert);
}
}
g_mutex_unlock (&factories_mutex);
}
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G_DEFINE_TYPE (GstAutoVideoConvert, gst_auto_video_convert, GST_TYPE_BIN);
static void
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gst_auto_video_convert_class_init (GstAutoVideoConvertClass * klass)
{
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GstElementClass *gstelement_class = (GstElementClass *) klass;
GST_DEBUG_CATEGORY_INIT (autovideoconvert_debug, "autovideoconvert", 0,
"Auto color space converter");
gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
gst_element_class_set_static_metadata (gstelement_class,
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"Select color space converter based on caps", "Generic/Bin",
"Selects the right color space converter based on the caps",
"Benjamin Gaignard <benjamin.gaignard@stericsson.com>");
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_auto_video_convert_change_state);
}
static gboolean
gst_auto_video_convert_add_autoconvert (GstAutoVideoConvert * autovideoconvert)
{
GstPad *pad;
if (autovideoconvert->autoconvert)
return TRUE;
autovideoconvert->autoconvert =
gst_element_factory_make ("autoconvert", "autoconvertchild");
if (!autovideoconvert->autoconvert) {
GST_ERROR_OBJECT (autovideoconvert,
"Could not create autoconvert instance");
return FALSE;
}
/* first add autoconvert in bin */
gst_bin_add (GST_BIN (autovideoconvert),
gst_object_ref (autovideoconvert->autoconvert));
/* get sinkpad and link it to ghost sink pad */
pad = gst_element_get_static_pad (autovideoconvert->autoconvert, "sink");
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (autovideoconvert->sinkpad),
pad);
gst_object_unref (pad);
/* get srcpad and link it to ghost src pad */
pad = gst_element_get_static_pad (autovideoconvert->autoconvert, "src");
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (autovideoconvert->srcpad), pad);
gst_object_unref (pad);
return TRUE;
}
static void
gst_auto_video_convert_remove_autoconvert (GstAutoVideoConvert *
autovideoconvert)
{
if (!autovideoconvert->autoconvert)
return;
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (autovideoconvert->srcpad),
NULL);
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (autovideoconvert->sinkpad),
NULL);
gst_bin_remove (GST_BIN (autovideoconvert), autovideoconvert->autoconvert);
gst_object_unref (autovideoconvert->autoconvert);
autovideoconvert->autoconvert = NULL;
}
static void
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gst_auto_video_convert_init (GstAutoVideoConvert * autovideoconvert)
{
GstPadTemplate *pad_tmpl;
/* get sink pad template */
pad_tmpl = gst_static_pad_template_get (&sinktemplate);
autovideoconvert->sinkpad =
gst_ghost_pad_new_no_target_from_template ("sink", pad_tmpl);
/* add sink ghost pad */
gst_element_add_pad (GST_ELEMENT (autovideoconvert),
autovideoconvert->sinkpad);
gst_object_unref (pad_tmpl);
/* get src pad template */
pad_tmpl = gst_static_pad_template_get (&srctemplate);
autovideoconvert->srcpad =
gst_ghost_pad_new_no_target_from_template ("src", pad_tmpl);
/* add src ghost pad */
gst_element_add_pad (GST_ELEMENT (autovideoconvert),
autovideoconvert->srcpad);
gst_object_unref (pad_tmpl);
return;
}
static GstStateChangeReturn
gst_auto_video_convert_change_state (GstElement * element,
GstStateChange transition)
{
GstAutoVideoConvert *autovideoconvert = GST_AUTO_VIDEO_CONVERT (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
{
/* create and add autoconvert in bin */
if (!gst_auto_video_convert_add_autoconvert (autovideoconvert)) {
ret = GST_STATE_CHANGE_FAILURE;
return ret;
}
/* get an updated list of factories */
gst_auto_video_convert_update_factory_list (autovideoconvert);
GST_DEBUG_OBJECT (autovideoconvert, "set factories list");
/* give factory list to autoconvert */
g_object_set (GST_ELEMENT (autovideoconvert->autoconvert), "factories",
factories, NULL);
break;
}
default:
break;
}
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ret = GST_ELEMENT_CLASS (gst_auto_video_convert_parent_class)->change_state
(element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
{
gst_auto_video_convert_remove_autoconvert (autovideoconvert);
break;
}
default:
break;
}
return ret;
}