C++ GST_DEBUG_FUNCPTR函数代码示例

static void
gst_opus_enc_class_init (GstOpusEncClass * klass)
{
  GObjectClass *gobject_class;
  GstAudioEncoderClass *base_class;
  GstElementClass *gstelement_class;

  gobject_class = (GObjectClass *) klass;
  base_class = (GstAudioEncoderClass *) klass;
  gstelement_class = (GstElementClass *) klass;

  gobject_class->set_property = gst_opus_enc_set_property;
  gobject_class->get_property = gst_opus_enc_get_property;

  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&src_factory));
  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&sink_factory));
  gst_element_class_set_static_metadata (gstelement_class, "Opus audio encoder",
      "Codec/Encoder/Audio",
      "Encodes audio in Opus format",
      "Vincent Penquerc'h <[email protected]>");

  base_class->start = GST_DEBUG_FUNCPTR (gst_opus_enc_start);
  base_class->stop = GST_DEBUG_FUNCPTR (gst_opus_enc_stop);
  base_class->set_format = GST_DEBUG_FUNCPTR (gst_opus_enc_set_format);
  base_class->handle_frame = GST_DEBUG_FUNCPTR (gst_opus_enc_handle_frame);
  base_class->sink_event = GST_DEBUG_FUNCPTR (gst_opus_enc_sink_event);
  base_class->getcaps = GST_DEBUG_FUNCPTR (gst_opus_enc_sink_getcaps);

  g_object_class_install_property (gobject_class, PROP_AUDIO,
      g_param_spec_boolean ("audio", "Audio or voice",
          "Audio or voice", DEFAULT_AUDIO,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BITRATE,
      g_param_spec_int ("bitrate", "Encoding Bit-rate",
          "Specify an encoding bit-rate (in bps).",
          LOWEST_BITRATE, HIGHEST_BITRATE, DEFAULT_BITRATE,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
          GST_PARAM_MUTABLE_PLAYING));
  g_object_class_install_property (gobject_class, PROP_BANDWIDTH,
      g_param_spec_enum ("bandwidth", "Band Width", "Audio Band Width",
          GST_OPUS_ENC_TYPE_BANDWIDTH, DEFAULT_BANDWIDTH,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
          GST_PARAM_MUTABLE_PLAYING));
  g_object_class_install_property (gobject_class, PROP_FRAME_SIZE,
      g_param_spec_enum ("frame-size", "Frame Size",
          "The duration of an audio frame, in ms", GST_OPUS_ENC_TYPE_FRAME_SIZE,
          DEFAULT_FRAMESIZE,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
          GST_PARAM_MUTABLE_PLAYING));
  g_object_class_install_property (gobject_class, PROP_CBR,
      g_param_spec_boolean ("cbr", "Constant bit rate", "Constant bit rate",
          DEFAULT_CBR,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
          GST_PARAM_MUTABLE_PLAYING));
  g_object_class_install_property (gobject_class, PROP_CONSTRAINED_VBR,
      g_param_spec_boolean ("constrained-vbr", "Constrained VBR",
          "Constrained VBR", DEFAULT_CONSTRAINED_VBR,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
          GST_PARAM_MUTABLE_PLAYING));
  g_object_class_install_property (gobject_class, PROP_COMPLEXITY,
      g_param_spec_int ("complexity", "Complexity", "Complexity", 0, 10,
          DEFAULT_COMPLEXITY,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
          GST_PARAM_MUTABLE_PLAYING));
  g_object_class_install_property (gobject_class, PROP_INBAND_FEC,
      g_param_spec_boolean ("inband-fec", "In-band FEC",
          "Enable forward error correction", DEFAULT_INBAND_FEC,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
          GST_PARAM_MUTABLE_PLAYING));
  g_object_class_install_property (gobject_class, PROP_DTX,
      g_param_spec_boolean ("dtx", "DTX", "DTX", DEFAULT_DTX,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
          GST_PARAM_MUTABLE_PLAYING));
  g_object_class_install_property (G_OBJECT_CLASS (klass),
      PROP_PACKET_LOSS_PERCENT, g_param_spec_int ("packet-loss-percentage",
          "Loss percentage", "Packet loss percentage", 0, 100,
          DEFAULT_PACKET_LOSS_PERCENT,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
          GST_PARAM_MUTABLE_PLAYING));
  g_object_class_install_property (G_OBJECT_CLASS (klass),
      PROP_MAX_PAYLOAD_SIZE, g_param_spec_uint ("max-payload-size",
          "Max payload size", "Maximum payload size in bytes", 2, 4000,
          DEFAULT_MAX_PAYLOAD_SIZE,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
          GST_PARAM_MUTABLE_PLAYING));

  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_opus_enc_finalize);

  GST_DEBUG_CATEGORY_INIT (opusenc_debug, "opusenc", 0, "Opus encoder");
}

static void
gst_euresys_class_init (GstEuresysClass * klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
  GstBaseSrcClass *gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
  GstPushSrcClass *gstpushsrc_class = GST_PUSH_SRC_CLASS (klass);

  GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "euresyssrc", 0,
      "Euresys MultiCam source");

  gobject_class->set_property = gst_euresys_set_property;
  gobject_class->get_property = gst_euresys_get_property;
  gobject_class->dispose = gst_euresys_dispose;

  /* Install GObject properties */
  g_object_class_install_property (gobject_class, PROP_BOARD_INDEX,
      g_param_spec_int ("board", "Board", "Index of board connected to camera",
          0, 15, DEFAULT_PROP_BOARD_INDEX,
          G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE |
          GST_PARAM_MUTABLE_READY));
  g_object_class_install_property (gobject_class, PROP_CAMERA_TYPE,
      g_param_spec_enum ("camera", "Camera", "Camera type",
          GST_TYPE_EURESYS_CAMERA, DEFAULT_PROP_CAMERA_TYPE,
          G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE |
          GST_PARAM_MUTABLE_READY));
  g_object_class_install_property (gobject_class, PROP_CONNECTOR,
      g_param_spec_enum ("connector", "Connector",
          "Connector where camera is attached", GST_TYPE_EURESYS_CONNECTOR,
          DEFAULT_PROP_CONNECTOR,
          G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE |
          GST_PARAM_MUTABLE_READY));
  g_object_class_install_property (gobject_class, PROP_COLOR_FORMAT,
      g_param_spec_enum ("color-format", "Color format",
          "Color format of the camera", GST_TYPE_EURESYS_COLOR_FORMAT,
          DEFAULT_PROP_COLOR_FORMAT,
          G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE |
          GST_PARAM_MUTABLE_READY));
  g_object_class_install_property (gobject_class, PROP_PIXEL_TIMING,
      g_param_spec_enum ("pixel-timing", "Pixel timing",
          "Pixel timing that produces square or broadcast timing",
          GST_TYPE_EURESYS_PIXEL_TIMING, DEFAULT_PROP_PIXEL_TIMING,
          G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE |
          GST_PARAM_MUTABLE_READY));
  g_object_class_install_property (gobject_class, PROP_NUM_CAPTURE_BUFFERS,
      g_param_spec_int ("num-capture-buffers", "Number of capture buffers",
          "Number of capture buffers", 2, 4095,
          DEFAULT_PROP_NUM_CAPTURE_BUFFERS,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));

  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&gst_euresys_src_template));

  gst_element_class_set_static_metadata (gstelement_class,
      "Euresys MultiCam Video Source", "Source/Video",
      "Euresys MultiCam framegrabber video source",
      "Joshua M. Doe <[email protected]>");

  gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_euresys_start);
  gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_euresys_stop);
  gstbasesrc_class->get_caps = GST_DEBUG_FUNCPTR (gst_euresys_get_caps);
  gstbasesrc_class->set_caps = GST_DEBUG_FUNCPTR (gst_euresys_set_caps);

  gstpushsrc_class->fill = GST_DEBUG_FUNCPTR (gst_euresys_fill);
}

static void
gst_curl_smtp_sink_class_init (GstCurlSmtpSinkClass * klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GstBaseSinkClass *gstbasesink_class = (GstBaseSinkClass *) klass;
  GstCurlBaseSinkClass *gstcurlbasesink_class = (GstCurlBaseSinkClass *) klass;
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  GST_DEBUG_CATEGORY_INIT (gst_curl_smtp_sink_debug, "curlsmtpsink", 0,
      "curl smtp sink element");
  GST_DEBUG_OBJECT (klass, "class_init");

  gst_element_class_set_static_metadata (element_class,
      "Curl smtp sink",
      "Sink/Network",
      "Upload data over SMTP protocol using libcurl",
      "Patricia Muscalu <[email protected]>");

  gstcurlbasesink_class->set_protocol_dynamic_options_unlocked =
      gst_curl_smtp_sink_set_payload_headers_unlocked;
  gstcurlbasesink_class->set_options_unlocked =
      gst_curl_smtp_sink_set_transfer_options_unlocked;
  gstcurlbasesink_class->set_mime_type = gst_curl_smtp_sink_set_mime_type;
  gstcurlbasesink_class->prepare_transfer = gst_curl_smtp_sink_prepare_transfer;
  gstcurlbasesink_class->transfer_data_buffer =
      gst_curl_smtp_sink_transfer_data_buffer;
  gstcurlbasesink_class->flush_data_unlocked =
      gst_curl_smtp_sink_flush_data_unlocked;
  gstcurlbasesink_class->has_buffered_data_unlocked =
      gst_curl_smtp_sink_has_buffered_data_unlocked;

  gstbasesink_class->event = gst_curl_smtp_sink_event;
  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_curl_smtp_sink_finalize);
  gobject_class->set_property = gst_curl_smtp_sink_set_property;
  gobject_class->get_property = gst_curl_smtp_sink_get_property;

  g_object_class_install_property (gobject_class, PROP_MAIL_RCPT,
      g_param_spec_string ("mail-rcpt", "Mail recipient",
          "Single address that the given mail should get sent to", NULL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_MAIL_FROM,
      g_param_spec_string ("mail-from", "Mail sender",
          "Single address that the given mail should get sent from", NULL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_CONTENT_TYPE,
      g_param_spec_string ("content-type", "Content type",
          "The mime type of the body of the request", NULL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_SUBJECT,
      g_param_spec_string ("subject", "UTF-8 encoded mail subject",
          "Mail subject", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_MESSAGE_BODY,
      g_param_spec_string ("message-body", "UTF-8 encoded message body",
          "Message body", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_USE_SSL,
      g_param_spec_boolean ("use-ssl", "Use SSL",
          "Use SSL/TLS for the connection", DEFAULT_USE_SSL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_NBR_ATTACHMENTS,
      g_param_spec_int ("nbr-attachments", "Number attachments",
          "Number attachments to send", G_MININT, G_MAXINT,
          DEFAULT_NBR_ATTACHMENTS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_POP_USER_NAME,
      g_param_spec_string ("pop-user", "User name",
          "User name to use for POP server authentication", NULL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_POP_USER_PASSWD,
      g_param_spec_string ("pop-passwd", "User password",
          "User password to use for POP server authentication", NULL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_POP_LOCATION,
      g_param_spec_string ("pop-location", "POP location",
          "URL POP used for authentication", NULL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

}

static void
gst_shape_wipe_init (GstShapeWipe * self, GstShapeWipeClass * g_class)
{
  self->video_sinkpad =
      gst_pad_new_from_static_template (&video_sink_pad_template, "video_sink");
  gst_pad_set_chain_function (self->video_sinkpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_video_sink_chain));
  gst_pad_set_event_function (self->video_sinkpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_video_sink_event));
  gst_pad_set_setcaps_function (self->video_sinkpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_video_sink_setcaps));
  gst_pad_set_getcaps_function (self->video_sinkpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_video_sink_getcaps));
  gst_pad_set_bufferalloc_function (self->video_sinkpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_video_sink_bufferalloc));
  gst_pad_set_query_function (self->video_sinkpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_video_sink_query));
  gst_element_add_pad (GST_ELEMENT (self), self->video_sinkpad);

  self->mask_sinkpad =
      gst_pad_new_from_static_template (&mask_sink_pad_template, "mask_sink");
  gst_pad_set_chain_function (self->mask_sinkpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_mask_sink_chain));
  gst_pad_set_event_function (self->mask_sinkpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_mask_sink_event));
  gst_pad_set_setcaps_function (self->mask_sinkpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_mask_sink_setcaps));
  gst_pad_set_getcaps_function (self->mask_sinkpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_mask_sink_getcaps));
  gst_element_add_pad (GST_ELEMENT (self), self->mask_sinkpad);

  self->srcpad = gst_pad_new_from_static_template (&src_pad_template, "src");
  gst_pad_set_event_function (self->srcpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_src_event));
  gst_pad_set_getcaps_function (self->srcpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_src_getcaps));
  gst_pad_set_query_function (self->srcpad,
      GST_DEBUG_FUNCPTR (gst_shape_wipe_src_query));
  gst_element_add_pad (GST_ELEMENT (self), self->srcpad);

  self->mask_mutex = g_mutex_new ();
  self->mask_cond = g_cond_new ();

  gst_shape_wipe_reset (self);
}

static void
gst_jack_audio_sink_class_init (GstJackAudioSinkClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  GstBaseSinkClass *gstbasesink_class;
  GstAudioBaseSinkClass *gstaudiobasesink_class;

  GST_DEBUG_CATEGORY_INIT (gst_jack_audio_sink_debug, "jacksink", 0,
      "jacksink element");

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
  gstbasesink_class = (GstBaseSinkClass *) klass;
  gstaudiobasesink_class = (GstAudioBaseSinkClass *) klass;

  gobject_class->dispose = gst_jack_audio_sink_dispose;
  gobject_class->get_property = gst_jack_audio_sink_get_property;
  gobject_class->set_property = gst_jack_audio_sink_set_property;

  g_object_class_install_property (gobject_class, PROP_CONNECT,
      g_param_spec_enum ("connect", "Connect",
          "Specify how the output ports will be connected",
          GST_TYPE_JACK_CONNECT, DEFAULT_PROP_CONNECT,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_SERVER,
      g_param_spec_string ("server", "Server",
          "The Jack server to connect to (NULL = default)",
          DEFAULT_PROP_SERVER, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  /**
   * GstJackAudioSink:client-name
   *
   * The client name to use.
   *
   * Since: 0.10.31
   */
  g_object_class_install_property (gobject_class, PROP_CLIENT_NAME,
      g_param_spec_string ("client-name", "Client name",
          "The client name of the Jack instance (NULL = default)",
          DEFAULT_PROP_CLIENT_NAME,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_CLIENT,
      g_param_spec_boxed ("client", "JackClient", "Handle for jack client",
          GST_TYPE_JACK_CLIENT,
          GST_PARAM_MUTABLE_READY | G_PARAM_READWRITE |
          G_PARAM_STATIC_STRINGS));

  /**
   * GstJackAudioSink:transport
   *
   * The jack transport behaviour for the client.
   *
   * Since: 0.10.31
   */
  g_object_class_install_property (gobject_class, PROP_TRANSPORT,
      g_param_spec_flags ("transport", "Transport mode",
          "Jack transport behaviour of the client",
          GST_TYPE_JACK_TRANSPORT, DEFAULT_PROP_TRANSPORT,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  gst_element_class_set_static_metadata (gstelement_class, "Audio Sink (Jack)",
      "Sink/Audio", "Output audio to a JACK server",
      "Wim Taymans <[email protected]>");

  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&jackaudiosink_sink_factory));

  gstbasesink_class->get_caps = GST_DEBUG_FUNCPTR (gst_jack_audio_sink_getcaps);

  gstaudiobasesink_class->create_ringbuffer =
      GST_DEBUG_FUNCPTR (gst_jack_audio_sink_create_ringbuffer);

  /* ref class from a thread-safe context to work around missing bit of
   * thread-safety in GObject */
  g_type_class_ref (GST_TYPE_JACK_RING_BUFFER);

  gst_jack_audio_client_init ();
}

/* initialize the opencvtextoverlay's class */
static void
gst_opencv_text_overlay_class_init (GstOpencvTextOverlayClass * klass)
{
  GObjectClass *gobject_class;

  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
  gobject_class = (GObjectClass *) klass;

  gobject_class->finalize =
      GST_DEBUG_FUNCPTR (gst_opencv_text_overlay_finalize);

  gobject_class->set_property = gst_opencv_text_overlay_set_property;
  gobject_class->get_property = gst_opencv_text_overlay_get_property;

  g_object_class_install_property (gobject_class, PROP_TEXT,
      g_param_spec_string ("text", "text",
          "Text to be display.", DEFAULT_PROP_TEXT,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_XPOS,
      g_param_spec_int ("xpos", "horizontal position",
          "Sets the Horizontal position", 0, G_MAXINT,
          DEFAULT_PROP_XPOS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_YPOS,
      g_param_spec_int ("ypos", "vertical position",
          "Sets the Vertical position", 0, G_MAXINT,
          DEFAULT_PROP_YPOS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_THICKNESS,
      g_param_spec_int ("thickness", "font thickness",
          "Sets the Thickness of Font", 0, G_MAXINT,
          DEFAULT_PROP_THICKNESS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_COLOR_R,
      g_param_spec_int ("colorR", "color -Red ",
          "Sets the color -R", 0, 255,
          DEFAULT_PROP_COLOR, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_COLOR_G,
      g_param_spec_int ("colorG", "color -Green",
          "Sets the color -G", 0, 255,
          DEFAULT_PROP_COLOR, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_COLOR_B,
      g_param_spec_int ("colorB", "color -Blue",
          "Sets the color -B", 0, 255,
          DEFAULT_PROP_COLOR, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_HEIGHT,
      g_param_spec_double ("height", "Height",
          "Sets the height of fonts", 1.0, 5.0,
          DEFAULT_HEIGHT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_WIDTH,
      g_param_spec_double ("width", "Width",
          "Sets the width of fonts", 1.0, 5.0,
          DEFAULT_WIDTH, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  gst_element_class_set_static_metadata (element_class,
      "opencvtextoverlay",
      "Filter/Effect/Video",
      "Write text on the top of video", "sreerenj<[email protected]>");

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&src_factory));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&sink_factory));

}

static void
gst_audio_test_src_class_init (GstAudioTestSrcClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  GstBaseSrcClass *gstbasesrc_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
  gstbasesrc_class = (GstBaseSrcClass *) klass;

  gobject_class->set_property = gst_audio_test_src_set_property;
  gobject_class->get_property = gst_audio_test_src_get_property;
  gobject_class->finalize = gst_audio_test_src_finalize;

  g_object_class_install_property (gobject_class, PROP_SAMPLES_PER_BUFFER,
      g_param_spec_int ("samplesperbuffer", "Samples per buffer",
          "Number of samples in each outgoing buffer",
          1, G_MAXINT, DEFAULT_SAMPLES_PER_BUFFER,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_WAVE,
      g_param_spec_enum ("wave", "Waveform", "Oscillator waveform",
          GST_TYPE_AUDIO_TEST_SRC_WAVE, GST_AUDIO_TEST_SRC_WAVE_SINE,
          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_FREQ,
      g_param_spec_double ("freq", "Frequency", "Frequency of test signal",
          0.0, 20000.0, DEFAULT_FREQ,
          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_VOLUME,
      g_param_spec_double ("volume", "Volume", "Volume of test signal", 0.0,
          1.0, DEFAULT_VOLUME,
          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_IS_LIVE,
      g_param_spec_boolean ("is-live", "Is Live",
          "Whether to act as a live source", DEFAULT_IS_LIVE,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (G_OBJECT_CLASS (klass),
      PROP_TIMESTAMP_OFFSET, g_param_spec_int64 ("timestamp-offset",
          "Timestamp offset",
          "An offset added to timestamps set on buffers (in ns)", G_MININT64,
          G_MAXINT64, DEFAULT_TIMESTAMP_OFFSET,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_CAN_ACTIVATE_PUSH,
      g_param_spec_boolean ("can-activate-push", "Can activate push",
          "Can activate in push mode", DEFAULT_CAN_ACTIVATE_PUSH,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_CAN_ACTIVATE_PULL,
      g_param_spec_boolean ("can-activate-pull", "Can activate pull",
          "Can activate in pull mode", DEFAULT_CAN_ACTIVATE_PULL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&gst_audio_test_src_src_template));
  gst_element_class_set_static_metadata (gstelement_class,
      "Audio test source", "Source/Audio",
      "Creates audio test signals of given frequency and volume",
      "Stefan Kost <[email protected]>");

  gstbasesrc_class->set_caps = GST_DEBUG_FUNCPTR (gst_audio_test_src_setcaps);
  gstbasesrc_class->fixate = GST_DEBUG_FUNCPTR (gst_audio_test_src_fixate);
  gstbasesrc_class->is_seekable =
      GST_DEBUG_FUNCPTR (gst_audio_test_src_is_seekable);
  gstbasesrc_class->do_seek = GST_DEBUG_FUNCPTR (gst_audio_test_src_do_seek);
  gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_audio_test_src_query);
  gstbasesrc_class->get_times =
      GST_DEBUG_FUNCPTR (gst_audio_test_src_get_times);
  gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_audio_test_src_start);
  gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_audio_test_src_stop);
  gstbasesrc_class->fill = GST_DEBUG_FUNCPTR (gst_audio_test_src_fill);
}

static void
gnl_object_class_init (GnlObjectClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  GnlObjectClass *gnlobject_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
  gnlobject_class = (GnlObjectClass *) klass;

  GST_DEBUG_CATEGORY_INIT (gnlobject, "gnlobject",
      GST_DEBUG_FG_BLUE | GST_DEBUG_BOLD, "GNonLin Object base class");

  gobject_class->set_property = GST_DEBUG_FUNCPTR (gnl_object_set_property);
  gobject_class->get_property = GST_DEBUG_FUNCPTR (gnl_object_get_property);
  gobject_class->dispose = GST_DEBUG_FUNCPTR (gnl_object_dispose);

  gstelement_class->change_state = GST_DEBUG_FUNCPTR (gnl_object_change_state);

  gnlobject_class->prepare = GST_DEBUG_FUNCPTR (gnl_object_prepare_func);
  gnlobject_class->cleanup = GST_DEBUG_FUNCPTR (gnl_object_cleanup_func);

  /**
   * GnlObject:start
   *
   * The start position relative to the parent in nanoseconds.
   */
  properties[PROP_START] = g_param_spec_uint64 ("start", "Start",
      "The start position relative to the parent (in nanoseconds)",
      0, G_MAXUINT64, 0, G_PARAM_READWRITE);
  g_object_class_install_property (gobject_class, PROP_START,
      properties[PROP_START]);

  /**
   * GnlObject:duration
   *
   * The outgoing duration in nanoseconds.
   */
  properties[PROP_DURATION] = g_param_spec_int64 ("duration", "Duration",
      "Outgoing duration (in nanoseconds)", 0, G_MAXINT64, 0,
      G_PARAM_READWRITE);
  g_object_class_install_property (gobject_class, PROP_DURATION,
      properties[PROP_DURATION]);

  /**
   * GnlObject:stop
   *
   * The stop position relative to the parent in nanoseconds.
   *
   * This value is computed based on the values of start and duration.
   */
  properties[PROP_STOP] = g_param_spec_uint64 ("stop", "Stop",
      "The stop position relative to the parent (in nanoseconds)",
      0, G_MAXUINT64, 0, G_PARAM_READABLE);
  g_object_class_install_property (gobject_class, PROP_STOP,
      properties[PROP_STOP]);

  /**
   * GnlObject:media_start
   *
   * The media start position in nanoseconds.
   *
   * Also called 'in-point' in video-editing, this corresponds to
   * what position in the 'contained' object we should start outputting from.
   */
  properties[PROP_MEDIA_START] =
      g_param_spec_uint64 ("media_start", "Media start",
      "The media start position (in nanoseconds)", 0, G_MAXUINT64,
      GST_CLOCK_TIME_NONE, G_PARAM_READWRITE);
  g_object_class_install_property (gobject_class, PROP_MEDIA_START,
      properties[PROP_MEDIA_START]);

  /**
   * GnlObject:media_duration
   *
   * The media's duration in nanoseconds.
   *
   * This correspond to the 'contained' object's duration we will be
   * outputting for.
   */
  properties[PROP_MEDIA_DURATION] =
      g_param_spec_int64 ("media_duration", "Media duration",
      "Duration of the media (in nanoseconds), can be negative", G_MININT64,
      G_MAXINT64, 0, G_PARAM_READWRITE);
  g_object_class_install_property (gobject_class, PROP_MEDIA_DURATION,
      properties[PROP_MEDIA_DURATION]);

  /**
   * GnlObject:media_stop
   *
   * The media stop position in nanoseconds.
   *
   * Also called 'out-point' in video-editing, this corresponds to the
   * position in the 'contained' object we should output until.
   *
   * This value is read-only, and is computed from the media_start and
   * media_duration property.
   */
  properties[PROP_MEDIA_STOP] = g_param_spec_uint64 ("media_stop", "Media stop",
//.........这里部分代码省略.........

static void
gst_v4l2src_class_init (GstV4l2SrcClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *element_class;
  GstBaseSrcClass *basesrc_class;
  GstPushSrcClass *pushsrc_class;

  gobject_class = G_OBJECT_CLASS (klass);
  element_class = GST_ELEMENT_CLASS (klass);
  basesrc_class = GST_BASE_SRC_CLASS (klass);
  pushsrc_class = GST_PUSH_SRC_CLASS (klass);

  gobject_class->dispose = gst_v4l2src_dispose;
  gobject_class->finalize = (GObjectFinalizeFunc) gst_v4l2src_finalize;
  gobject_class->set_property = gst_v4l2src_set_property;
  gobject_class->get_property = gst_v4l2src_get_property;

  element_class->change_state = gst_v4l2src_change_state;

  gst_v4l2_object_install_properties_helper (gobject_class,
      DEFAULT_PROP_DEVICE);

  /**
   * GstV4l2Src::prepare-format:
   * @v4l2src: the v4l2src instance
   * @fd: the file descriptor of the current device
   * @fourcc: the fourcc of the format being set
   * @width: The width of the video
   * @height: The height of the video
   *
   * This signal gets emitted before calling the v4l2 VIDIOC_S_FMT ioctl
   * (set format). This allows for any custom configuration of the device to
   * happen prior to the format being set.
   * This is mostly useful for UVC H264 encoding cameras which need the H264
   * Probe & Commit to happen prior to the normal Probe & Commit.
   *
   * Since: 0.10.32
   */
  gst_v4l2_signals[SIGNAL_PRE_SET_FORMAT] = g_signal_new ("prepare-format",
      G_TYPE_FROM_CLASS (klass),
      G_SIGNAL_RUN_LAST,
      0,
      NULL, NULL,
      NULL, G_TYPE_NONE, 4, G_TYPE_INT, G_TYPE_UINT, G_TYPE_UINT, G_TYPE_UINT);

  gst_element_class_set_static_metadata (element_class,
      "Video (video4linux2) Source", "Source/Video",
      "Reads frames from a Video4Linux2 device",
      "Edgard Lima <[email protected]>, "
      "Stefan Kost <[email protected]>");

  gst_element_class_add_pad_template
      (element_class,
      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
          gst_v4l2_object_get_all_caps ()));

  basesrc_class->get_caps = GST_DEBUG_FUNCPTR (gst_v4l2src_get_caps);
  basesrc_class->set_caps = GST_DEBUG_FUNCPTR (gst_v4l2src_set_caps);
  basesrc_class->start = GST_DEBUG_FUNCPTR (gst_v4l2src_start);
  basesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_v4l2src_unlock);
  basesrc_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_v4l2src_unlock_stop);
  basesrc_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2src_stop);
  basesrc_class->query = GST_DEBUG_FUNCPTR (gst_v4l2src_query);
  basesrc_class->fixate = GST_DEBUG_FUNCPTR (gst_v4l2src_fixate);
  basesrc_class->event = GST_DEBUG_FUNCPTR (gst_v4l2src_event);
  basesrc_class->negotiate = GST_DEBUG_FUNCPTR (gst_v4l2src_negotiate);
  basesrc_class->decide_allocation =
      GST_DEBUG_FUNCPTR (gst_v4l2src_decide_allocation);

  pushsrc_class->fill = GST_DEBUG_FUNCPTR (gst_v4l2src_fill);

  klass->v4l2_class_devices = NULL;

  GST_DEBUG_CATEGORY_INIT (v4l2src_debug, "v4l2src", 0, "V4L2 source element");
}

static void
kms_pointer_detector_class_init (KmsPointerDetectorClass * klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GstBaseTransformClass *base_transform_class =
      GST_BASE_TRANSFORM_CLASS (klass);
  GstVideoFilterClass *video_filter_class = GST_VIDEO_FILTER_CLASS (klass);

  /* Setting up pads and setting metadata should be moved to
     base_class_init if you intend to subclass this class. */
  gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
          gst_caps_from_string (VIDEO_SRC_CAPS)));
  gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
          gst_caps_from_string (VIDEO_SINK_CAPS)));

  gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
      "Pointer detector element", "Video/Filter",
      "Detects pointer an raises events with its position",
      "Francisco Rivero <[email protected]>");

  gobject_class->set_property = kms_pointer_detector_set_property;
  gobject_class->get_property = kms_pointer_detector_get_property;
  gobject_class->dispose = kms_pointer_detector_dispose;
  gobject_class->finalize = kms_pointer_detector_finalize;
  base_transform_class->start = GST_DEBUG_FUNCPTR (kms_pointer_detector_start);
  base_transform_class->stop = GST_DEBUG_FUNCPTR (kms_pointer_detector_stop);
  video_filter_class->set_info =
      GST_DEBUG_FUNCPTR (kms_pointer_detector_set_info);
  video_filter_class->transform_frame_ip =
      GST_DEBUG_FUNCPTR (kms_pointer_detector_transform_frame_ip);

  /* Properties initialization */
  g_object_class_install_property (gobject_class, PROP_NUM_REGIONS,
      g_param_spec_int ("num-regions-eval", "num regions eval",
          "Number of regions evaluated when searching for similar regions",
          20, 400, 150, G_PARAM_READWRITE));

  g_object_class_install_property (gobject_class, PROP_WINDOW_SCALE,
      g_param_spec_int ("scale-search-window", "scale search window",
          "Fix the size of the searching window",
          2, 100, 5, G_PARAM_READWRITE));

  g_object_class_install_property (gobject_class, PROP_SHOW_DEBUG_INFO,
      g_param_spec_boolean ("show-debug-region", "show debug region",
          "show evaluation regions over the image", FALSE, G_PARAM_READWRITE));

  g_object_class_install_property (gobject_class, PROP_WINDOWS_LAYOUT,
      g_param_spec_boxed ("windows-layout", "windows layout",
          "supply the positions and dimensions of windows into the main window",
          GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_MESSAGE,
      g_param_spec_boolean ("message", "message",
          "Put a window-in or window-out message in the bus if "
          "an object enters o leaves a window", TRUE, G_PARAM_READWRITE));

  g_object_class_install_property (gobject_class, PROP_SHOW_WINDOWS_LAYOUT,
      g_param_spec_boolean ("show-windows-layout", "show windows layout",
          "show windows layout over the image", TRUE, G_PARAM_READWRITE));

}

static void
gst_shout2send_class_init (GstShout2sendClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  GstBaseSinkClass *gstbasesink_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
  gstbasesink_class = (GstBaseSinkClass *) klass;

  parent_class = g_type_class_peek_parent (klass);

  gobject_class->set_property = gst_shout2send_set_property;
  gobject_class->get_property = gst_shout2send_get_property;
  gobject_class->finalize = (GObjectFinalizeFunc) gst_shout2send_finalize;

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_IP,
      g_param_spec_string ("ip", "ip", "ip", DEFAULT_IP,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PORT,
      g_param_spec_int ("port", "port", "port", 1, G_MAXUSHORT, DEFAULT_PORT,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PASSWORD,
      g_param_spec_string ("password", "password", "password", DEFAULT_PASSWORD,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_USERNAME,
      g_param_spec_string ("username", "username", "username", DEFAULT_USERNAME,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  /* metadata */
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PUBLIC,
      g_param_spec_boolean ("public", "public",
          "If the stream should be listed on the server's stream directory",
          DEFAULT_PUBLIC, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_STREAMNAME,
      g_param_spec_string ("streamname", "streamname", "name of the stream",
          DEFAULT_STREAMNAME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_DESCRIPTION,
      g_param_spec_string ("description", "description", "description",
          DEFAULT_DESCRIPTION, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_GENRE,
      g_param_spec_string ("genre", "genre", "genre", DEFAULT_GENRE,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_PROTOCOL,
      g_param_spec_enum ("protocol", "protocol", "Connection Protocol to use",
          GST_TYPE_SHOUT_PROTOCOL, DEFAULT_PROTOCOL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));


  /* icecast only */
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MOUNT,
      g_param_spec_string ("mount", "mount", "mount", DEFAULT_MOUNT,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_URL,
      g_param_spec_string ("url", "url", "url", DEFAULT_URL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  /* signals */
  gst_shout2send_signals[SIGNAL_CONNECTION_PROBLEM] =
      g_signal_new ("connection-problem", G_TYPE_FROM_CLASS (klass),
      G_SIGNAL_RUN_CLEANUP, G_STRUCT_OFFSET (GstShout2sendClass,
          connection_problem), NULL, NULL, g_cclosure_marshal_VOID__INT,
      G_TYPE_NONE, 1, G_TYPE_INT);

  gstbasesink_class->start = GST_DEBUG_FUNCPTR (gst_shout2send_start);
  gstbasesink_class->stop = GST_DEBUG_FUNCPTR (gst_shout2send_stop);
  gstbasesink_class->unlock = GST_DEBUG_FUNCPTR (gst_shout2send_unlock);
  gstbasesink_class->unlock_stop =
      GST_DEBUG_FUNCPTR (gst_shout2send_unlock_stop);
  gstbasesink_class->render = GST_DEBUG_FUNCPTR (gst_shout2send_render);
  gstbasesink_class->event = GST_DEBUG_FUNCPTR (gst_shout2send_event);
  gstbasesink_class->set_caps = GST_DEBUG_FUNCPTR (gst_shout2send_setcaps);

  gst_element_class_add_pad_template (gstelement_class,
      gst_static_pad_template_get (&sink_template));

  gst_element_class_set_static_metadata (gstelement_class,
      "Icecast network sink",
      "Sink/Network", "Sends data to an icecast server",
      "Wim Taymans <[email protected]>, "
      "Pedro Corte-Real <[email protected]>, "
      "Zaheer Abbas Merali <zaheerabbas at merali dot org>");

  GST_DEBUG_CATEGORY_INIT (shout2_debug, "shout2", 0, "shout2send element");
}

      GST_DEBUG_FUNCPTR (gst_adder_request_new_pad);
  gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_adder_release_pad);
  gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_adder_change_state);
}

static void
gst_adder_init (GstAdder * adder)
{
  GstPadTemplate *template;

  template = gst_static_pad_template_get (&gst_adder_src_template);
  adder->srcpad = gst_pad_new_from_template (template, "src");
  gst_object_unref (template);

  gst_pad_set_query_function (adder->srcpad,
      GST_DEBUG_FUNCPTR (gst_adder_src_query));
  gst_pad_set_event_function (adder->srcpad,
      GST_DEBUG_FUNCPTR (gst_adder_src_event));
  GST_PAD_SET_PROXY_CAPS (adder->srcpad);
  gst_element_add_pad (GST_ELEMENT (adder), adder->srcpad);

  adder->current_caps = NULL;
  gst_audio_info_init (&adder->info);
  adder->padcount = 0;

  adder->filter_caps = NULL;

  /* keep track of the sinkpads requested */
  adder->collect = gst_collect_pads_new ();
  gst_collect_pads_set_function (adder->collect,
      GST_DEBUG_FUNCPTR (gst_adder_collected), adder);

static void
gst_curl_base_sink_class_init (GstCurlBaseSinkClass * klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GstBaseSinkClass *gstbasesink_class = (GstBaseSinkClass *) klass;
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  GST_DEBUG_CATEGORY_INIT (gst_curl_base_sink_debug, "curlbasesink", 0,
      "curl base sink element");
  GST_DEBUG_OBJECT (klass, "class_init");

  gst_element_class_set_static_metadata (element_class,
      "Curl base sink",
      "Sink/Network",
      "Upload data over the network to a server using libcurl",
      "Patricia Muscalu <[email protected]>");

  gstbasesink_class->event = GST_DEBUG_FUNCPTR (gst_curl_base_sink_event);
  gstbasesink_class->render = GST_DEBUG_FUNCPTR (gst_curl_base_sink_render);
  gstbasesink_class->start = GST_DEBUG_FUNCPTR (gst_curl_base_sink_start);
  gstbasesink_class->stop = GST_DEBUG_FUNCPTR (gst_curl_base_sink_stop);
  gstbasesink_class->unlock = GST_DEBUG_FUNCPTR (gst_curl_base_sink_unlock);
  gstbasesink_class->unlock_stop =
      GST_DEBUG_FUNCPTR (gst_curl_base_sink_unlock_stop);
  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_curl_base_sink_finalize);

  gobject_class->set_property = gst_curl_base_sink_set_property;
  gobject_class->get_property = gst_curl_base_sink_get_property;

  klass->handle_transfer = handle_transfer;
  klass->transfer_read_cb = gst_curl_base_sink_transfer_read_cb;
  klass->transfer_data_buffer = gst_curl_base_sink_transfer_data_buffer;
  klass->has_buffered_data_unlocked =
      gst_curl_base_sink_default_has_buffered_data_unlocked;

  /* FIXME: check against souphttpsrc and use same names for same properties */
  g_object_class_install_property (gobject_class, PROP_LOCATION,
      g_param_spec_string ("location", "Location",
          "URI location to write to", NULL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_USER_NAME,
      g_param_spec_string ("user", "User name",
          "User name to use for server authentication", NULL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_USER_PASSWD,
      g_param_spec_string ("passwd", "User password",
          "User password to use for server authentication", NULL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_FILE_NAME,
      g_param_spec_string ("file-name", "Base file name",
          "The base file name for the uploaded images", NULL,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_TIMEOUT,
      g_param_spec_int ("timeout", "Timeout",
          "Number of seconds waiting to write before timeout",
          0, G_MAXINT, DEFAULT_TIMEOUT,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_QOS_DSCP,
      g_param_spec_int ("qos-dscp",
          "QoS diff srv code point",
          "Quality of Service, differentiated services code point (0 default)",
          DSCP_MIN, DSCP_MAX, DEFAULT_QOS_DSCP,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  gst_element_class_add_static_pad_template (element_class, &sinktemplate);
}

//.........这里部分代码省略.........
  GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);

  parent_class = g_type_class_peek_parent (klass);

  /* FIXME: remove after confirming it is safe now */
  g_type_class_ref (gst_selector_pad_get_type ());

  gobject_class->dispose = gst_input_selector_dispose;

  gobject_class->set_property = gst_input_selector_set_property;
  gobject_class->get_property = gst_input_selector_get_property;

  g_object_class_install_property (gobject_class, PROP_N_PADS,
      g_param_spec_uint ("n-pads", "Number of Pads",
          "The number of sink pads", 0, G_MAXUINT, 0,
          G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_ACTIVE_PAD,
      g_param_spec_object ("active-pad", "Active pad",
          "The currently active sink pad", GST_TYPE_PAD,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_SELECT_ALL,
      g_param_spec_boolean ("select-all", "Select all mode",
          "Forwards data from all input pads", FALSE,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  /**
   * GstInputSelector::block:
   * @inputselector: the #GstInputSelector
   *
   * Block all sink pads in preparation for a switch. Returns the stop time of
   * the current switch segment, as a running time, or 0 if there is no current
   * active pad or the current active pad never received data.
   */
  gst_input_selector_signals[SIGNAL_BLOCK] =
      g_signal_new ("block", G_TYPE_FROM_CLASS (klass),
      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
      G_STRUCT_OFFSET (GstInputSelectorClass, block), NULL, NULL,
      __gst_camerabin_marshal_INT64__VOID, G_TYPE_INT64, 0);
  /**
   * GstInputSelector::switch:
   * @inputselector: the #GstInputSelector
   * @pad:            the pad to switch to
   * @stop_time:      running time at which to close the previous segment, or -1
   *                  to use the running time of the previously active sink pad
   * @start_time:     running time at which to start the new segment, or -1 to
   *                  use the running time of the newly active sink pad
   *
   * Switch to a new feed. The segment opened by the previously active pad, if
   * any, will be closed, and a new segment opened before data flows again.
   *
   * This signal must be emitted when the element has been blocked via the <link
   * linkend="GstInputSelector-block">block</link> signal.
   *
   * If you have a stream with only one switch element, such as an audio-only
   * stream, a stream switch should be performed by first emitting the block
   * signal, and then emitting the switch signal with -1 for the stop and start
   * time values.
   *
   * The intention of the @stop_time and @start_time arguments is to allow
   * multiple switch elements to switch and maintain stream synchronization.
   * When switching a stream with multiple feeds, you will need as many switch
   * elements as you have feeds. For example, a feed with audio and video will
   * have one switch element between the audio feeds and one for video.
   *
   * A switch over multiple switch elements should be performed as follows:
   * First, emit the <link linkend="GstInputSelector-block">block</link>
   * signal, collecting the returned values. The maximum running time returned
   * by block should then be used as the time at which to close the previous
   * segment.
   *
   * Then, query the running times of the new audio and video pads that you will
   * switch to. Naturally, these pads are on separate switch elements. Take the
   * minimum running time for those streams and use it for the time at which to
   * open the new segment.
   *
   * If @pad is the same as the current active pad, the element will cancel any
   * previous block without adjusting segments.
   *
   * <note><simpara>
   * the signal changed from accepting the pad name to the pad object.
   * </simpara></note>
   *
   * Since: 0.10.7
   */
  gst_input_selector_signals[SIGNAL_SWITCH] =
      g_signal_new ("switch", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
      G_STRUCT_OFFSET (GstInputSelectorClass, switch_),
      NULL, NULL, __gst_camerabin_marshal_VOID__OBJECT_INT64_INT64,
      G_TYPE_NONE, 3, GST_TYPE_PAD, G_TYPE_INT64, G_TYPE_INT64);

  gstelement_class->request_new_pad = gst_input_selector_request_new_pad;
  gstelement_class->release_pad = gst_input_selector_release_pad;
  gstelement_class->change_state = gst_input_selector_change_state;

  klass->block = GST_DEBUG_FUNCPTR (gst_input_selector_block);
  /* note the underscore because switch is a keyword otherwise */
  klass->switch_ = GST_DEBUG_FUNCPTR (gst_input_selector_switch);
}

static void
gst_video_detect_class_init (gpointer klass, gpointer class_data)
{
  GObjectClass *gobject_class;
  GstBaseTransformClass *trans_class;

  gobject_class = (GObjectClass *) klass;
  trans_class = (GstBaseTransformClass *) klass;

  parent_class = g_type_class_peek_parent (klass);

  gobject_class->set_property = gst_video_detect_set_property;
  gobject_class->get_property = gst_video_detect_get_property;

  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_MESSAGE,
      g_param_spec_boolean ("message", "Message",
          "Post statics messages",
          DEFAULT_MESSAGE,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_PATTERN_WIDTH,
      g_param_spec_int ("pattern-width", "Pattern width",
          "The width of the pattern markers", 1, G_MAXINT,
          DEFAULT_PATTERN_WIDTH,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_PATTERN_HEIGHT,
      g_param_spec_int ("pattern-height", "Pattern height",
          "The height of the pattern markers", 1, G_MAXINT,
          DEFAULT_PATTERN_HEIGHT,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_PATTERN_COUNT,
      g_param_spec_int ("pattern-count", "Pattern count",
          "The number of pattern markers", 0, G_MAXINT,
          DEFAULT_PATTERN_COUNT,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_PATTERN_DATA_COUNT,
      g_param_spec_int ("pattern-data-count", "Pattern data count",
          "The number of extra data pattern markers", 0, G_MAXINT,
          DEFAULT_PATTERN_DATA_COUNT,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_PATTERN_CENTER,
      g_param_spec_double ("pattern-center", "Pattern center",
          "The center of the black/white separation (0.0 = lowest, 1.0 highest)",
          0.0, 1.0, DEFAULT_PATTERN_CENTER,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_PATTERN_SENSITIVITY,
      g_param_spec_double ("pattern-sensitivity", "Pattern sensitivity",
          "The sensitivity around the center for detecting the markers "
          "(0.0 = lowest, 1.0 highest)", 0.0, 1.0, DEFAULT_PATTERN_SENSITIVITY,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_LEFT_OFFSET,
      g_param_spec_int ("left-offset", "Left Offset",
          "The offset from the left border where the pattern starts", 0,
          G_MAXINT, DEFAULT_LEFT_OFFSET,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
  g_object_class_install_property (gobject_class, PROP_BOTTOM_OFFSET,
      g_param_spec_int ("bottom-offset", "Bottom Offset",
          "The offset from the bottom border where the pattern starts", 0,
          G_MAXINT, DEFAULT_BOTTOM_OFFSET,
          G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));

  trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_detect_set_caps);
  trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_video_detect_transform_ip);
  trans_class->passthrough_on_same_caps = TRUE;

  GST_DEBUG_CATEGORY_INIT (video_detect_debug, "videodetect", 0,
      "Video detect");
}