C++ Kurento:无法接收来自GStreamer元素的回调；“切刀”；

我正在尝试在kurento

mediapipeline

上应用一些GStreamer插件，这里我希望GStreamer代码在独立程序中运行良好，可以发送与

cutter

相关的回调消息

以下是我的代码：

namespace kurento
{
    namespace module
    {
        namespace vadcustomfilter
        {
            std::string Id = "";

            void VADCustomFilterImpl::busMessage(GstMessage * message)
            {
                GST_ERROR("***In BusMessage***");

                if (message->type == GST_MESSAGE_EOS)
                {
                    g_object_set(G_OBJECT(valve), "drop", FALSE, NULL);
                }

                const GstStructure *s = gst_message_get_structure(message);
                const gchar *name = gst_structure_get_name(s);
                GST_INFO("Name: %s\n", name);

                if (message->type == GST_MESSAGE_ELEMENT)
                {
                    if (strcmp(name, "cutter") == 0)
                    {
                        GstClockTime time = 0;
                        GstClockTime prevsilencetime = 0;

                        if (!gst_structure_get_boolean(s, "above", &above))
                        {
                            GST_ERROR("could not parse above");
                        }

                        GST_INFO("above: %d", above);

                        if (above)
                        {
                            if (isSpeaking == 0)
                            {
                                revsilencetime = time;                              
                                g_object_set(G_OBJECT(valve), "drop", FALSE, NULL);
                            }
                            /*Send Voice Detected Event */                          
                            try
                            {
                                GST_ERROR("Sending Event: VoiceDetected");
                                VoiceDetected event(shared_from_this(), "voice-detected", Id.c_str());
                                signalVoiceDetected(event);
                                GST_ERROR("Sent Event: VoiceDetected");
                            }
                            catch (std::bad_weak_ptr & e)
                            {
                                GST_ERROR("EXCEPTION: Voice activity detected ");
                            }
                            isSpeaking = 1;
                        }
                        else
                        {
                            if (isSpeaking == 1)
                            {
                                g_object_set(G_OBJECT(valve), "drop", TRUE, NULL);
                            }
                            isSpeaking = 0;
                        }
                    }
                }
            }


            VADCustomFilterImpl::VADCustomFilterImpl(const boost::property_tree::
                ptree & config,
                std::shared_ptr <
                MediaPipeline > mediaPipeline,
                const std::string &pipelineId) :FilterImpl
                (config,
                std::dynamic_pointer_cast <MediaObjectImpl> (mediaPipeline))
            {
-->Edit Start       

                g_object_set (element, "filter-factory", "audioconvert", NULL);
                g_object_get (G_OBJECT (element), "filter", &audioconvertfilter, NULL);

                if (audioconvertfilter == NULL) {
                    throw KurentoException (MEDIA_OBJECT_NOT_FOUND, "MediaObject not found: audioconvertfilter");
                }

                g_object_set (element, "filter-factory", "cutter", NULL);
                g_object_get (G_OBJECT (element), "filter", &cutterfilter, NULL);

                if (cutterfilter == NULL) {
                    throw KurentoException (MEDIA_OBJECT_NOT_FOUND, "MediaObject not found: cutterfilter");
                }

                g_object_set (G_OBJECT (cutterfilter), "threshold-dB", -39.0, NULL);
                g_object_set (G_OBJECT (cutterfilter), "run-length", 400000000, NULL);


                g_object_set (element, "filter-factory", "vadcustomfilter", NULL);

                g_object_get (G_OBJECT (element), "filter", &vadCustomFilter, NULL);

                bus_handler_id = 0;
                GST_ERROR("PipelineId: constructor %s",pipelineId.c_str());
                Id = pipelineId;
    -->Edit End

            }


            void VADCustomFilterImpl::postConstructor()
            {
                GstBus *bus;

                std::shared_ptr < MediaPipelineImpl > pipe;

                FilterImpl::postConstructor();

                pipe =
                    std::dynamic_pointer_cast <MediaPipelineImpl>
                    (getMediaPipeline());
                g_assert(pipe);

                /* #1. Add cutter filter here */
                create_gst_cutter_filter(pipe);


                bus = gst_pipeline_get_bus(GST_PIPELINE(pipe->getPipeline()));
                g_assert(bus);
                bus_handler_id = register_signal_handler(G_OBJECT(bus),
                    "message",
                    std::function <
                    void(GstElement *,
                    GstMessage *) >
                    (std::bind
                    (&VADCustomFilterImpl::
                    busMessage, this,
                    std::placeholders::_2)),
                    std::dynamic_pointer_cast <
                    VADCustomFilterImpl>
                    (shared_from_this()));


                GST_ERROR("busMessage added successfully.");

                g_object_unref(bus);
            }

            VADCustomFilterImpl::~VADCustomFilterImpl()
            {
                std::shared_ptr < MediaPipelineImpl > pipe;

                if (bus_handler_id > 0)
                {
                    pipe =
                        std::dynamic_pointer_cast <MediaPipelineImpl>
                        (getMediaPipeline());
                    GstBus *bus =
                        gst_pipeline_get_bus(GST_PIPELINE(pipe->getPipeline()));
                    unregister_signal_handler(bus, bus_handler_id);
                    g_object_unref(bus);
                }
            }

            MediaObjectImpl *VADCustomFilterImplFactory::createObject(const boost::
                property_tree::
                ptree &
                config,
                std::
                shared_ptr <
                MediaPipeline
                >
                mediaPipeline,
                const std::string &pipelineId)
                const
            {
                GST_ERROR("Pipeline Id createObject %s", pipelineId.c_str());
                return new VADCustomFilterImpl(config, mediaPipeline, pipelineId.c_str());
            }




            VADCustomFilterImpl::StaticConstructor VADCustomFilterImpl::
                staticConstructor;

            VADCustomFilterImpl::StaticConstructor::StaticConstructor()
            {
                GST_DEBUG_CATEGORY_INIT(GST_CAT_DEFAULT, GST_DEFAULT_NAME, 0,
                    GST_DEFAULT_NAME);
            }
        }/* vadcustomfilter */
    }/* module */
}/* kurento */

---

您创建gstreamer元素的方式似乎不是Kuranto所期望的方式。基本上，您是在函数

create\u gst\u cutter\u filter

中创建未正确链接的元素

如果您正在创建一个过滤器，那么所有gstreamer内容（创建元素并连接它们）都应该在您调用的gstreamer元素中完成

vadcustomfilter

此元素只需要一个接收器和一个src垫

如果您想创建一种不同类型的元素，因为您正在添加MultifileSink，那么您需要从MediaElement进行扩展，并创建一个从

KmsElement

扩展的gstreamer元素。您可以在中看到这方面的示例

编辑：

---

关于服务器返回的错误。这似乎与这里的问题无关，而是与依赖性问题有关。回过头来看看你是否有同样的问题

@SagarPilkhwal是的，kms元素是一个巨大的项目，但它是我们唯一有非过滤器插件示例的地方。如果您按照此处关于gstreamer插件的说明进行操作，您将获得没有opencv的项目的基本代码。但我认为这是你已经做过的。你希望你的插件有什么目标？取决于它，你应该选择一条或另一条路径。看看zbar过滤器是如何完成的。也许你不需要

audioconvert

，agnosticbin在大多数情况下都可以为你做到。你是对的，kurento不允许在管道上进行搜索。你需要一种不同的技巧，创建自定义录音机或类似的东西，这不是一件容易的任务。另一个更简单的选择可能是录制一个文件，然后对其进行后期处理，用您已有的程序消除沉默。

Req-> {"id":13,"method":"invoke","params":{"object":"ff394885-ff7b-4cd2-ac83-190ab58056c3_kurento.MediaPipeline/4911aa60-27e4-461e-86c0-10532bc30d4f_kurento.WebRtcEndpoint","operation":"addIceCandidate","operationParams":{"candidate":{"sdpMid":"audio","__module__":"kurento","sdpMLineIndex":0,"__type__":"IceCandidate","candidate":"candidate:1226269011 1 udp 2122260223 172.24.9.207 62808 typ host generation 0 ufrag nSC45+9JNTCJm+yr"}},"sessionId":"15daae09-de86-4293-a3de-28f33f2d0b16"},"jsonrpc":"2.0"}


Res {"id":13,"error":{"code":40401,"message":"Error adding candidate","data":{"type":"ICE_ADD_CANDIDATE_ERROR"}},"jsonrpc":"2.0"}