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/*
* GStreamer
* Copyright (C) 2012 Matthew Waters <ystree00@gmail.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 <gst/gl/gl.h>
#include "gstgldownloadelement.h"
GST_DEBUG_CATEGORY_STATIC (gst_gl_download_element_debug);
#define GST_CAT_DEFAULT gst_gl_download_element_debug
#define gst_gl_download_element_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstGLDownloadElement, gst_gl_download_element,
GST_TYPE_GL_BASE_FILTER,
GST_DEBUG_CATEGORY_INIT (gst_gl_download_element_debug, "gldownloadelement",
0, "download element"););
static gboolean gst_gl_download_element_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, gsize * size);
static GstCaps *gst_gl_download_element_transform_caps (GstBaseTransform * bt,
GstPadDirection direction, GstCaps * caps, GstCaps * filter);
static gboolean gst_gl_download_element_set_caps (GstBaseTransform * bt,
GstCaps * in_caps, GstCaps * out_caps);
static GstFlowReturn
gst_gl_download_element_prepare_output_buffer (GstBaseTransform * bt,
GstBuffer * buffer, GstBuffer ** outbuf);
static GstFlowReturn gst_gl_download_element_transform (GstBaseTransform * bt,
GstBuffer * buffer, GstBuffer * outbuf);
static GstStaticPadTemplate gst_gl_download_element_src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw; video/x-raw(memory:GLMemory)"));
static GstStaticPadTemplate gst_gl_download_element_sink_pad_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw(memory:GLMemory)"));
static void
gst_gl_download_element_class_init (GstGLDownloadElementClass * klass)
{
GstBaseTransformClass *bt_class = GST_BASE_TRANSFORM_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
bt_class->transform_caps = gst_gl_download_element_transform_caps;
bt_class->set_caps = gst_gl_download_element_set_caps;
bt_class->get_unit_size = gst_gl_download_element_get_unit_size;
bt_class->prepare_output_buffer =
gst_gl_download_element_prepare_output_buffer;
bt_class->transform = gst_gl_download_element_transform;
bt_class->passthrough_on_same_caps = TRUE;
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_gl_download_element_src_pad_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_gl_download_element_sink_pad_template));
gst_element_class_set_metadata (element_class,
"OpenGL uploader", "Filter/Video",
"Downloads data from OpenGL", "Matthew Waters <matthew@centricular.com>");
}
static void
gst_gl_download_element_init (GstGLDownloadElement * download)
{
gst_base_transform_set_prefer_passthrough (GST_BASE_TRANSFORM (download),
TRUE);
}
static gboolean
gst_gl_download_element_set_caps (GstBaseTransform * bt, GstCaps * in_caps,
GstCaps * out_caps)
{
GstVideoInfo out_info;
if (!gst_video_info_from_caps (&out_info, out_caps))
return FALSE;
return TRUE;
}
static GstCaps *
_set_caps_features (const GstCaps * caps, const gchar * feature_name)
{
GstCaps *tmp = gst_caps_copy (caps);
guint n = gst_caps_get_size (tmp);
guint i = 0;
for (i = 0; i < n; i++)
gst_caps_set_features (tmp, i,
gst_caps_features_from_string (feature_name));
return tmp;
}
static GstCaps *
gst_gl_download_element_transform_caps (GstBaseTransform * bt,
GstPadDirection direction, GstCaps * caps, GstCaps * filter)
{
GstCaps *result, *tmp;
if (direction == GST_PAD_SRC) {
tmp = _set_caps_features (caps, GST_CAPS_FEATURE_MEMORY_GL_MEMORY);
tmp = gst_caps_merge (gst_caps_ref (caps), tmp);
} else {
tmp = _set_caps_features (caps, GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY);
tmp = gst_caps_merge (gst_caps_ref (caps), tmp);
}
if (filter) {
result = gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (tmp);
} else {
result = tmp;
}
GST_DEBUG_OBJECT (bt, "returning caps %" GST_PTR_FORMAT, result);
return result;
}
static gboolean
gst_gl_download_element_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
gsize * size)
{
gboolean ret = FALSE;
GstVideoInfo info;
ret = gst_video_info_from_caps (&info, caps);
if (ret)
*size = GST_VIDEO_INFO_SIZE (&info);
return TRUE;
}
static GstFlowReturn
gst_gl_download_element_prepare_output_buffer (GstBaseTransform * bt,
GstBuffer * inbuf, GstBuffer ** outbuf)
{
GstCaps *src_caps = gst_pad_get_current_caps (bt->srcpad);
GstCapsFeatures *features = NULL;
gint i, n;
*outbuf = inbuf;
if (src_caps)
features = gst_caps_get_features (src_caps, 0);
n = gst_buffer_n_memory (*outbuf);
for (i = 0; i < n; i++) {
GstMemory *mem = gst_buffer_peek_memory (*outbuf, i);
if (gst_is_gl_memory (mem)) {
if (!features || gst_caps_features_contains (features,
GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY)) {
gst_gl_memory_download_transfer ((GstGLMemory *) mem);
}
}
}
if (src_caps)
gst_caps_unref (src_caps);
return GST_FLOW_OK;
}
static GstFlowReturn
gst_gl_download_element_transform (GstBaseTransform * bt,
GstBuffer * inbuf, GstBuffer * outbuf)
{
return GST_FLOW_OK;
}
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