C++ GST_PIPELINE函数代码示例

void MediaPlayerPrivate::createGSTPlayBin(String url)
{
    ASSERT(!m_playBin);
    m_playBin = gst_element_factory_make("playbin2", "play");

    GstBus* bus = gst_pipeline_get_bus(GST_PIPELINE(m_playBin));
    gst_bus_add_signal_watch(bus);
    g_signal_connect(bus, "message", G_CALLBACK(mediaPlayerPrivateMessageCallback), this);
    gst_object_unref(bus);

    g_object_set(G_OBJECT(m_playBin), "uri", url.utf8().data(),
        "volume", static_cast<double>(m_player->volume()), NULL);

    m_videoSink = webkit_video_sink_new();

    g_object_ref_sink(m_videoSink);
    g_object_set(m_playBin, "video-sink", m_videoSink, NULL);

    g_signal_connect(m_videoSink, "repaint-requested", G_CALLBACK(mediaPlayerPrivateRepaintCallback), this);
}

MediaPipelineImpl::MediaPipelineImpl (const boost::property_tree::ptree &config)
  : MediaObjectImpl (config)
{
  GstClock *clock;

  pipeline = gst_pipeline_new (NULL);

  if (pipeline == NULL) {
    throw KurentoException (MEDIA_OBJECT_NOT_AVAILABLE,
                            "Cannot create gstreamer pipeline");
  }

  clock = gst_system_clock_obtain ();
  gst_pipeline_use_clock (GST_PIPELINE (pipeline), clock);
  g_object_unref (clock);

  gst_element_set_state (pipeline, GST_STATE_PLAYING);

  busMessageHandler = 0;
}

int tsmf_platform_register_handler(TSMFGstreamerDecoder* decoder)
{
	GstBus* bus;

	if (!decoder)
		return -1;

	if (!decoder->pipe)
		return -1;

	bus = gst_pipeline_get_bus(GST_PIPELINE(decoder->pipe));

	if (!bus)
	{
		WLog_ERR(TAG, "gst_pipeline_get_bus failed!");
		return 1;
	}

	return 0;
}

GST_END_TEST
GST_START_TEST (request_audio_src_pad_pending)
{
  GstElement *dummysrc;
  gchar *padname = NULL;
  GstBus *bus;

  loop = g_main_loop_new (NULL, TRUE);
  pipeline = gst_pipeline_new (__FUNCTION__);
  bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));

  gst_bus_add_signal_watch (bus);
  g_signal_connect (bus, "message", G_CALLBACK (bus_msg), pipeline);

  dummysrc = gst_element_factory_make ("dummysrc", NULL);
  g_signal_connect (dummysrc, "pad-added", G_CALLBACK (pad_added_delayed),
      &padname);

  gst_bin_add (GST_BIN (pipeline), dummysrc);

  gst_element_set_state (pipeline, GST_STATE_PLAYING);

  /* request src pad using action */
  g_signal_emit_by_name (dummysrc, "request-new-pad",
      KMS_ELEMENT_PAD_TYPE_AUDIO, NULL, GST_PAD_SRC, &padname);
  fail_if (padname == NULL);

  GST_DEBUG ("Pad name %s", padname);
  g_object_set (G_OBJECT (dummysrc), "audio", TRUE, NULL);

  g_free (padname);

  g_timeout_add_seconds (4, print_timedout_pipeline, NULL);
  g_main_loop_run (loop);

  gst_element_set_state (pipeline, GST_STATE_NULL);
  gst_bus_remove_signal_watch (bus);
  g_object_unref (bus);
  g_object_unref (pipeline);
  g_main_loop_unref (loop);
}

QDeclarativeVideoEditor::QDeclarativeVideoEditor(QObject *parent) :
    QAbstractListModel(parent), m_position(0), m_positionTimer(this), m_rendering(false), m_size(0),
    m_width(0), m_height(0), m_fpsn(0), m_fpsd(0)
{
    QHash<int, QByteArray> roles;
    roles.insert( 33 , "uri" );
    roles.insert( 34 , "fileName" );
    roles.insert( 35 , "inPoint" );
    roles.insert( 36 , "duration" );
    setRoleNames(roles);

    connect(&m_positionTimer, SIGNAL(timeout()), SLOT(updatePosition()));

    m_timeline = ges_timeline_new_audio_video();
    m_timelineLayer = (GESTimelineLayer*) ges_simple_timeline_layer_new();
    ges_timeline_add_layer(m_timeline, m_timelineLayer);
    m_pipeline = ges_timeline_pipeline_new();

    GstBus *bus = gst_pipeline_get_bus (GST_PIPELINE (m_pipeline));
    gst_bus_add_watch (bus, bus_call, this);
    gst_object_unref (bus);

    /*
     * gst-dsp encoders seems to not proxy downstream caps correctly, this can make
     * GES fail to render some projects. We override the default getcaps on our own
     */
    g_signal_connect(m_pipeline, "element-added", (GCallback) gstcapstricks_pipeline_element_added, NULL);

    ges_timeline_pipeline_add_timeline (m_pipeline, m_timeline);

    m_vsink = gst_element_factory_make ("omapxvsink", "previewvsink");
    ges_timeline_pipeline_preview_set_video_sink (m_pipeline, m_vsink);
    gst_x_overlay_set_render_rectangle (GST_X_OVERLAY (m_vsink),
                                        171, 0,
                                        512, 288);

    ges_timeline_pipeline_set_mode (m_pipeline, TIMELINE_MODE_PREVIEW);
    gst_element_set_state ((GstElement*) m_pipeline, GST_STATE_PAUSED);
    m_duration = GST_CLOCK_TIME_NONE;
    m_progress = 0.0;
}

	void RgAnalyser::HandleErrorMsg (GstMessage *msg)
	{
		GError *gerror = nullptr;
		gchar *debug = nullptr;
		gst_message_parse_error (msg, &gerror, &debug);

		const auto& msgStr = QString::fromUtf8 (gerror->message);
		const auto& debugStr = QString::fromUtf8 (debug);

		const auto code = gerror->code;
		const auto domain = gerror->domain;

		g_error_free (gerror);
		g_free (debug);

		qWarning () << Q_FUNC_INFO
				<< domain
				<< code
				<< msgStr
				<< debugStr;


		if (IsDraining_)
			return;

		IsDraining_ = true;
		const auto bus = gst_pipeline_get_bus (GST_PIPELINE (Pipeline_));
		while (const auto msg = gst_bus_timed_pop (bus, 0.01 * GST_SECOND))
			handleMessage (std::shared_ptr<GstMessage> (msg, gst_message_unref));
		IsDraining_ = false;

		gst_element_set_state (Pipeline_, GST_STATE_NULL);
		PopThread_->Resume ();

		const auto trackInfoPos = std::find_if (Result_.Tracks_.begin (), Result_.Tracks_.end (),
				[this] (const TrackRgResult& info) { return info.TrackPath_ == CurrentPath_; });
		if (trackInfoPos == Result_.Tracks_.end ())
			Result_.Tracks_.append ({ CurrentPath_, 0, 0 });

		CheckFinish ();
	}

int main(int argc, char** argv)
{
    GMainLoop *loop;
    GstElement *play;

    gst_init(&argc, &argv);

    play = gst_element_factory_make("playbin2", "play");
	//play->set_properties("volume", 10);
    loop = g_main_loop_new(NULL, FALSE);

    g_object_set(G_OBJECT(play), "uri", argv[1], NULL);
    gst_bus_add_watch(gst_pipeline_get_bus(GST_PIPELINE(play)), bus_cb, loop);
    g_print("playing......\n");
    gst_element_set_state(play, GST_STATE_PLAYING);
    g_print("start g_main_loop_run\n");
    g_main_loop_run(loop);
    g_print("g_main_loop_run return\n");
    gst_element_set_state(play, GST_STATE_NULL);
    return 0;
}

void CrowdDetectorFilterImpl::postConstructor ()
{
  GstBus *bus;
  std::shared_ptr<MediaPipelineImpl> pipe;

  FilterImpl::postConstructor ();

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

  bus = gst_pipeline_get_bus (GST_PIPELINE (pipe->getPipeline() ) );

  bus_handler_id = register_signal_handler (G_OBJECT (bus),
                   "message",
                   std::function <void (GstElement *, GstMessage *) >
                   (std::bind (&CrowdDetectorFilterImpl::busMessage, this,
                               std::placeholders::_2) ),
                   std::dynamic_pointer_cast<CrowdDetectorFilterImpl>
                   (shared_from_this() ) );

  g_object_unref (bus);
}

static void
gst_pipeline_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec)
{
  GstPipeline *pipeline = GST_PIPELINE (object);

  switch (prop_id) {
    case PROP_DELAY:
      g_value_set_uint64 (value, gst_pipeline_get_delay (pipeline));
      break;
    case PROP_AUTO_FLUSH_BUS:
      g_value_set_boolean (value, gst_pipeline_get_auto_flush_bus (pipeline));
      break;
    case PROP_LATENCY:
      g_value_set_uint64 (value, gst_pipeline_get_latency (pipeline));
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static void
gst_play_file(const char *filename){
 
	GMainLoop *loop;
	GstElement *pipeline;
	GstBus *bus;
	GstElement *source , *parser , *sink;
 
	loop = g_main_loop_new(NULL , TRUE);
 
	pipeline = gst_pipeline_new("audio-player");
 
	source = gst_element_factory_make("filesrc" , "source");
	parser = gst_element_factory_make("wavparse" , "parser");
	sink = gst_element_factory_make("alsasink" , "output");
 
	g_object_set(G_OBJECT(source) , "location"
			, filename , NULL);
 
	bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
	gst_bus_add_watch(bus , bus_watch , loop);
	g_object_unref(bus);
 
	gst_bin_add_many(GST_BIN(pipeline)
			, source , parser , sink , NULL);
 
	g_signal_connect(parser
			, "pad-added" , G_CALLBACK(add_pad) , sink);
 
	if(! gst_element_link(source , parser)){
		g_warning("linke source to parser failed");
	}
 
	gst_element_set_state(pipeline , GST_STATE_PLAYING);
	printf("Start playing...\n");
	g_main_loop_run(loop);
	printf("Playing stopped!!!\n");
	gst_element_set_state(pipeline , GST_STATE_NULL);
	g_object_unref(pipeline);
}

void gstreamer_determine_video_dimensions(const char *uri, int *video_width,
int *video_height) {
	GMainLoop *loop = g_main_loop_new(NULL, FALSE);

	char *playbin_launch_str = malloc(strlen(uri) + 64);
	sprintf(playbin_launch_str, PLAYBIN_STR
		" uri=%s audio-sink=fakesink video-sink=fakesink", uri);
	GError *error2 = NULL;
	GstElement *playbin = gst_parse_launch(playbin_launch_str, &error2);
	if (error2) {
		printf("Error: Could not create gstreamer pipeline for identification.\n");
		printf("Parse error: %s\n", error2->message);
		exit(1);
	}

	playbin_pipeline = playbin;
	bus_quit_on_playing = TRUE;
	GstBus *playbin_bus = gst_pipeline_get_bus(GST_PIPELINE(playbin));
	guint type_find_bus_watch_id = gst_bus_add_watch(playbin_bus, bus_callback, loop);
	gst_object_unref(playbin_bus);

	gst_element_set_state(GST_ELEMENT(playbin), GST_STATE_READY);
	gst_element_set_state(GST_ELEMENT(playbin), GST_STATE_PLAYING);
	g_main_loop_run(loop);
	gst_element_set_state(GST_ELEMENT(playbin), GST_STATE_PAUSED);

	GstPad *pad = gst_pad_new("", GST_PAD_UNKNOWN);
	g_signal_emit_by_name(playbin, "get-video-pad", 0, &pad, NULL);
	GstCaps *caps = gst_pad_get_current_caps(pad);
	*video_width = g_value_get_int(gst_structure_get_value(
		gst_caps_get_structure(caps, 0), "width"));
	*video_height = g_value_get_int(gst_structure_get_value(
		gst_caps_get_structure(caps, 0), "height"));
	g_object_unref(pad);

	gst_element_set_state(GST_ELEMENT(playbin), GST_STATE_NULL);
	gst_object_unref(GST_OBJECT(playbin));
	g_source_remove(type_find_bus_watch_id);
	g_main_loop_unref(loop);
}

MediaPlayerPrivateGStreamerBase::~MediaPlayerPrivateGStreamerBase()
{
    if (m_repaintHandler) {
        g_signal_handler_disconnect(m_videoSink.get(), m_repaintHandler);
        m_repaintHandler = 0;
    }

    g_mutex_clear(&m_sampleMutex);

    m_player = 0;

    if (m_volumeSignalHandler) {
        g_signal_handler_disconnect(m_volumeElement.get(), m_volumeSignalHandler);
        m_volumeSignalHandler = 0;
    }

    if (m_muteSignalHandler) {
        g_signal_handler_disconnect(m_volumeElement.get(), m_muteSignalHandler);
        m_muteSignalHandler = 0;
    }

#if USE(GSTREAMER_GL)
    g_cond_clear(&m_drawCondition);
    g_mutex_clear(&m_drawMutex);
#endif

    if (m_pipeline) {
        GRefPtr<GstBus> bus = adoptGRef(gst_pipeline_get_bus(GST_PIPELINE(m_pipeline.get())));
        ASSERT(bus);
        g_signal_handlers_disconnect_by_func(bus.get(), reinterpret_cast<gpointer>(mediaPlayerPrivateNeedContextMessageCallback), this);
        gst_bus_disable_sync_message_emission(bus.get());
        m_pipeline.clear();
    }

#if USE(TEXTURE_MAPPER_GL) && !USE(COORDINATED_GRAPHICS)
    if (client())
        client()->platformLayerWillBeDestroyed();
#endif
}

eServiceMP3Record::~eServiceMP3Record()
{
	if (m_recording_pipeline)
	{
		// disconnect sync handler callback
		GstBus *bus = gst_pipeline_get_bus(GST_PIPELINE(m_recording_pipeline));
#if GST_VERSION_MAJOR < 1
		gst_bus_set_sync_handler(bus, NULL, NULL);
#else
		gst_bus_set_sync_handler(bus, NULL, NULL, NULL);
#endif
		gst_object_unref(bus);
	}

	if (m_state > stateIdle)
		stop();

	if (m_recording_pipeline)
	{
		gst_object_unref(GST_OBJECT(m_recording_pipeline));
	}
}

//BUILDER COMMENT. DO NOT REMOVE. auxcode begin
void Music::init(const string newName, AL::ALPtr<AL::ALBroker> parentBroker) {
	Component::init(newName, parentBroker);

	#ifdef WEBOTS
	return;
	#endif

	// init GStreamer
	gst_init (NULL, NULL);
  	loop = g_main_loop_new (NULL, FALSE);

  	// set up
  	play = gst_element_factory_make ("playbin2", "play");
	bus = gst_pipeline_get_bus (GST_PIPELINE (play));

	// set state
	gst_element_set_state (play, GST_STATE_READY);

	isSetFileMp3 = false;
	isPlayPress = false;
	isStopPress = false;
}

gboolean introbin_set_pad_offset(CustomData *data)
{
  gint64 pos2;
  pos2=gst_element_get_base_time(data->pipeline);
  GstClock *clock;
  clock=gst_pipeline_get_clock(GST_PIPELINE(data->pipeline));
  GstClockTime clock_time;
  clock_time=gst_clock_get_time(clock);
  gst_object_unref(clock);
  g_print("Pipeline times: base_time=%lld\n clock_time=%lld",
		            pos2,clock_time);
  GstElement *dec=gst_bin_get_by_name(GST_BIN(data->introbin),"introdec");
  GstPad *src_pad1,*src_pad2;
  src_pad1=gst_element_get_static_pad(GST_ELEMENT(dec),"src_0");
  gst_pad_set_offset(src_pad1,clock_time-pos2);
  gst_object_unref(src_pad1);
  src_pad2=gst_element_get_static_pad(GST_ELEMENT(dec),"src_1");
  gst_pad_set_offset(src_pad2,clock_time-pos2);
  gst_object_unref(src_pad2);

  return TRUE;
}