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109 lines
3 KiB
C
109 lines
3 KiB
C
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/*
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* gstvaapiutils_gst.c - GST utilties
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*
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* gstreamer-vaapi (C) 2010 Splitted-Desktop Systems
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include "gstvaapiutils_gst.h"
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#include "gstvaapivideosink.h"
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#include "gstvaapivideobuffer.h"
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#define DEBUG 1
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#include "gstvaapidebug.h"
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static GstVaapiDisplay *
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lookup_through_vaapisink_iface(GstElement *element)
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{
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GstVaapiDisplay *display;
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GstVaapiVideoSink *sink;
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GST_DEBUG("looking for a downstream vaapisink");
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/* Look for a downstream vaapisink */
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sink = gst_vaapi_video_sink_lookup(element);
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if (!sink)
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return NULL;
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display = gst_vaapi_video_sink_get_display(sink);
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GST_DEBUG(" found display %p", display);
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return display;
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}
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static GstVaapiDisplay *
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lookup_through_peer_buffer(GstElement *element)
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{
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GstVaapiDisplay *display;
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GstPad *pad;
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GstBuffer *buffer;
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GstFlowReturn ret;
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GST_DEBUG("looking for a GstVaapiVideoBuffer from peer");
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/* Lookup for a GstVaapiVideoBuffer from peer */
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pad = gst_element_get_static_pad(element, "src");
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if (!pad)
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return NULL;
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buffer = NULL;
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ret = gst_pad_alloc_buffer(pad, 0, 0, GST_PAD_CAPS(pad), &buffer);
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g_object_unref(pad);
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if (ret != GST_FLOW_OK || !buffer)
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return NULL;
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display = GST_VAAPI_IS_VIDEO_BUFFER(buffer) ?
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gst_vaapi_video_buffer_get_display(GST_VAAPI_VIDEO_BUFFER(buffer)) :
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NULL;
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gst_buffer_unref(buffer);
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GST_DEBUG(" found display %p", display);
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return display;
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}
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/**
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* gst_vaapi_display_lookup_downstream:
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* @element: a #GstElement
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*
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* Finds a suitable #GstVaapiDisplay downstream from @element.
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*
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* 1. Check whether a downstream element implements the
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* #GstVaapiVideoSinkInterface interface.
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*
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* 2. Check whether the @element peer implements a custom
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* buffer_alloc() function that allocates #GstVaapiVideoBuffer
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* buffers.
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*
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* Return value: a downstream allocated #GstVaapiDisplay object, or
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* %NULL if none was found
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*/
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GstVaapiDisplay *
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gst_vaapi_display_lookup_downstream(GstElement *element)
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{
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GstVaapiDisplay *display;
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display = lookup_through_vaapisink_iface(element);
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if (display)
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return display;
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display = lookup_through_peer_buffer(element);
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if (display)
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return display;
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return NULL;
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}
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