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138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/* GStreamer Round Robin
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* Copyright (C) 2019 Net Insight AB
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* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
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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 Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-roundrobin
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* @title: roundrobin
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*
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* This is a generic element that will distribute equally incoming
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* buffers over multiple src pads. This is the opposite of tee
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* element, which duplicates buffers over all pads. This element
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* can be used to distrute load across multiple branches when the buffer
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* can be processed independently.
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*/
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#include "gstroundrobin.h"
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GST_DEBUG_CATEGORY_STATIC (gst_round_robin_debug);
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#define GST_CAT_DEFAULT gst_round_robin_debug
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static GstStaticPadTemplate sink_templ = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("ANY"));
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static GstStaticPadTemplate src_templ = GST_STATIC_PAD_TEMPLATE ("src_%d",
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GST_PAD_SRC,
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GST_PAD_REQUEST,
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GST_STATIC_CAPS ("ANY"));
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struct _GstRoundRobin
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{
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GstElement parent;
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gint index;
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};
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G_DEFINE_TYPE_WITH_CODE (GstRoundRobin, gst_round_robin,
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GST_TYPE_ELEMENT, GST_DEBUG_CATEGORY_INIT (gst_round_robin_debug,
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"roundrobin", 0, "Round Robin"));
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GST_ELEMENT_REGISTER_DEFINE (roundrobin, "roundrobin", GST_RANK_NONE,
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GST_TYPE_ROUND_ROBIN);
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static GstFlowReturn
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gst_round_robin_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
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{
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GstRoundRobin *disp = (GstRoundRobin *) parent;
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GstElement *elem = (GstElement *) parent;
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GstPad *src_pad = NULL;
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GstFlowReturn ret;
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GST_OBJECT_LOCK (disp);
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if (disp->index >= elem->numsrcpads)
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disp->index = 0;
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src_pad = g_list_nth_data (elem->srcpads, disp->index);
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if (src_pad) {
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gst_object_ref (src_pad);
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disp->index += 1;
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}
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GST_OBJECT_UNLOCK (disp);
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if (!src_pad)
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/* no pad, that's fine */
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return GST_FLOW_OK;
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ret = gst_pad_push (src_pad, buffer);
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gst_object_unref (src_pad);
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return ret;
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}
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static GstPad *
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gst_round_robin_request_pad (GstElement * element, GstPadTemplate * templ,
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const gchar * name, const GstCaps * caps)
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{
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GstPad *pad;
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pad = gst_element_get_static_pad (element, name);
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if (pad) {
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gst_object_unref (pad);
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return NULL;
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}
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pad = gst_pad_new_from_static_template (&src_templ, name);
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gst_element_add_pad (element, pad);
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return pad;
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}
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static void
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gst_round_robin_init (GstRoundRobin * disp)
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{
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GstPad *pad;
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gst_element_create_all_pads (GST_ELEMENT (disp));
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pad = GST_PAD (GST_ELEMENT (disp)->sinkpads->data);
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GST_PAD_SET_PROXY_CAPS (pad);
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GST_PAD_SET_PROXY_SCHEDULING (pad);
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/* do not proxy allocation, it requires special handling like tee does */
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gst_pad_set_chain_function (pad, GST_DEBUG_FUNCPTR (gst_round_robin_chain));
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}
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static void
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gst_round_robin_class_init (GstRoundRobinClass * klass)
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{
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GstElementClass *element_class = (GstElementClass *) klass;
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gst_element_class_set_metadata (element_class,
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"Round Robin", "Source/Network",
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"A round robin dispatcher element.",
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"Nicolas Dufresne <nicolas.dufresne@collabora.com");
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gst_element_class_add_static_pad_template (element_class, &sink_templ);
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gst_element_class_add_static_pad_template (element_class, &src_templ);
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element_class->request_new_pad =
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GST_DEBUG_FUNCPTR (gst_round_robin_request_pad);
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}
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