gstreamer/ext/gl/gstglsrcbin.c
2017-12-09 19:31:59 +00:00

265 lines
7.1 KiB
C

/*
* GStreamer
* Copyright (C) 2015 Matthew Waters <matthew@centricular.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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstglsrcbin.h"
GST_DEBUG_CATEGORY (gst_debug_gl_src_bin);
#define GST_CAT_DEFAULT gst_debug_gl_src_bin
static void gst_gl_src_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * param_spec);
static void gst_gl_src_bin_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * param_spec);
static GstStateChangeReturn gst_gl_src_bin_change_state (GstElement * element,
GstStateChange transition);
static GstStaticPadTemplate gst_gl_src_bin_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw(ANY)"));
enum
{
PROP_0,
PROP_SRC,
};
enum
{
SIGNAL_0,
SIGNAL_CREATE_ELEMENT,
SIGNAL_LAST,
};
static guint gst_gl_src_bin_signals[SIGNAL_LAST] = { 0, };
#define gst_gl_src_bin_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstGLSrcBin, gst_gl_src_bin,
GST_TYPE_BIN,
GST_DEBUG_CATEGORY_INIT (gst_debug_gl_src_bin, "glsrcbin", 0,
"OpenGL Video Src Bin"));
static void
gst_gl_src_bin_class_init (GstGLSrcBinClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *element_class;
gobject_class = (GObjectClass *) klass;
element_class = GST_ELEMENT_CLASS (klass);
element_class->change_state = gst_gl_src_bin_change_state;
gobject_class->set_property = gst_gl_src_bin_set_property;
gobject_class->get_property = gst_gl_src_bin_get_property;
g_object_class_install_property (gobject_class, PROP_SRC,
g_param_spec_object ("src",
"GL src element",
"The GL src chain to use",
GST_TYPE_ELEMENT,
GST_PARAM_MUTABLE_READY | G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
/**
* GstGLSrcBin::create-element:
* @object: the #GstGLSrcBin
*
* Will be emitted when we need the processing element/s that this bin will use
*
* Returns: a new #GstElement
*/
gst_gl_src_bin_signals[SIGNAL_CREATE_ELEMENT] =
g_signal_new ("create-element", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, g_cclosure_marshal_generic,
GST_TYPE_ELEMENT, 0);
gst_element_class_set_metadata (element_class,
"GL Src Bin", "Src/Video",
"Infrastructure to process GL textures",
"Matthew Waters <matthew@centricular.com>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_gl_src_bin_template));
}
static void
gst_gl_src_bin_init (GstGLSrcBin * self)
{
gboolean res = TRUE;
GstPad *pad;
self->download = gst_element_factory_make ("gldownload", NULL);
self->convert = gst_element_factory_make ("glcolorconvert", NULL);
res &= gst_bin_add (GST_BIN (self), self->download);
res &= gst_bin_add (GST_BIN (self), self->convert);
res &= gst_element_link_pads (self->convert, "src", self->download, "sink");
pad = gst_element_get_static_pad (self->download, "src");
if (!pad) {
res = FALSE;
} else {
GST_DEBUG_OBJECT (self, "setting target src pad %" GST_PTR_FORMAT, pad);
self->srcpad = gst_ghost_pad_new ("src", pad);
gst_element_add_pad (GST_ELEMENT_CAST (self), self->srcpad);
gst_object_unref (pad);
}
if (!res) {
GST_WARNING_OBJECT (self, "Failed to add/connect the necessary machinery");
}
}
static gboolean
_connect_src_element (GstGLSrcBin * self)
{
gboolean res = TRUE;
gst_object_set_name (GST_OBJECT (self->src), "src");
res &= gst_bin_add (GST_BIN (self), self->src);
res &= gst_element_link_pads (self->src, "src", self->convert, "sink");
if (!res)
GST_ERROR_OBJECT (self, "Failed to link src element into the pipeline");
return res;
}
void
gst_gl_src_bin_finish_init_with_element (GstGLSrcBin * self,
GstElement * element)
{
g_return_if_fail (GST_IS_ELEMENT (element));
self->src = element;
if (!_connect_src_element (self)) {
gst_object_unref (self->src);
self->src = NULL;
}
}
void
gst_gl_src_bin_finish_init (GstGLSrcBin * self)
{
GstGLSrcBinClass *klass = GST_GL_SRC_BIN_GET_CLASS (self);
GstElement *element = NULL;
if (klass->create_element)
element = klass->create_element ();
if (element)
gst_gl_src_bin_finish_init_with_element (self, element);
}
static void
gst_gl_src_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstGLSrcBin *self = GST_GL_SRC_BIN (object);
switch (prop_id) {
case PROP_SRC:
{
GstElement *src = g_value_get_object (value);
if (self->src)
gst_bin_remove (GST_BIN (self), self->src);
self->src = src;
if (src)
_connect_src_element (self);
break;
}
default:
if (self->src)
g_object_set_property (G_OBJECT (self->src), pspec->name, value);
break;
}
}
static void
gst_gl_src_bin_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstGLSrcBin *self = GST_GL_SRC_BIN (object);
switch (prop_id) {
case PROP_SRC:
g_value_set_object (value, self->src);
break;
default:
if (self->src)
g_object_get_property (G_OBJECT (self->src), pspec->name, value);
break;
}
}
static GstStateChangeReturn
gst_gl_src_bin_change_state (GstElement * element, GstStateChange transition)
{
GstGLSrcBin *self = GST_GL_SRC_BIN (element);
GstGLSrcBinClass *klass = GST_GL_SRC_BIN_GET_CLASS (self);
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GST_DEBUG ("changing state: %s => %s",
gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!self->src) {
if (klass->create_element)
self->src = klass->create_element ();
if (!self->src)
g_signal_emit (element,
gst_gl_src_bin_signals[SIGNAL_CREATE_ELEMENT], 0, &self->src);
if (!self->src) {
GST_ERROR_OBJECT (element, "Failed to retreive element");
return GST_STATE_CHANGE_FAILURE;
}
if (!_connect_src_element (self))
return GST_STATE_CHANGE_FAILURE;
}
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
default:
break;
}
return ret;
}