gstreamer/sys/decklink/gstdecklinksrc.cpp

/* GStreamer
 * Copyright (C) 2011 David Schleef <ds@schleef.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
 * Boston, MA 02110-1335, USA.
 */
/**
 * SECTION:element-gstdecklinksrc
 *
 * The decklinksrc element is a source element for Blackmagic
 * Decklink cards.
 *
 * <refsect2>
 * <title>Example launch line</title>
 * |[
 * gst-launch -v decklinksrc ! xvimagesink
 * ]|
 * 
 * </refsect2>
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

/* FIXME 0.11: suppress warnings for deprecated API such as GStaticRecMutex
 * with newer GLib versions (>= 2.31.0) */
#define GLIB_DISABLE_DEPRECATION_WARNINGS

#include <gst/gst.h>
#include <gst/glib-compat-private.h>
#include "gstdecklink.h"
#include "gstdecklinksrc.h"
#include "capture.h"
#include <string.h>
#include <gst/interfaces/propertyprobe.h>


GST_DEBUG_CATEGORY (gst_decklink_src_debug_category);
#define GST_CAT_DEFAULT gst_decklink_src_debug_category

/* prototypes */


static void gst_decklink_src_set_property (GObject * object,
    guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_decklink_src_get_property (GObject * object,
    guint property_id, GValue * value, GParamSpec * pspec);
static void gst_decklink_src_dispose (GObject * object);
static void gst_decklink_src_finalize (GObject * object);

static GstPad *gst_decklink_src_request_new_pad (GstElement * element,
    GstPadTemplate * templ, const gchar * name);
static void gst_decklink_src_release_pad (GstElement * element, GstPad * pad);
static GstStateChangeReturn
gst_decklink_src_change_state (GstElement * element, GstStateChange transition);
static GstClock *gst_decklink_src_provide_clock (GstElement * element);
static gboolean gst_decklink_src_set_clock (GstElement * element,
    GstClock * clock);
static GstIndex *gst_decklink_src_get_index (GstElement * element);
static void gst_decklink_src_set_index (GstElement * element, GstIndex * index);
static gboolean gst_decklink_src_send_event (GstElement * element,
    GstEvent * event);
static gboolean gst_decklink_src_query (GstElement * element, GstQuery * query);

static GstCaps *gst_decklink_src_audio_src_getcaps (GstPad * pad);
static gboolean gst_decklink_src_audio_src_setcaps (GstPad * pad,
    GstCaps * caps);
static gboolean gst_decklink_src_audio_src_acceptcaps (GstPad * pad,
    GstCaps * caps);
static void gst_decklink_src_audio_src_fixatecaps (GstPad * pad,
    GstCaps * caps);
static gboolean gst_decklink_src_audio_src_activate (GstPad * pad);
static gboolean gst_decklink_src_audio_src_activatepush (GstPad * pad,
    gboolean active);
static gboolean gst_decklink_src_audio_src_activatepull (GstPad * pad,
    gboolean active);
static GstPadLinkReturn gst_decklink_src_audio_src_link (GstPad * pad,
    GstPad * peer);
static GstFlowReturn gst_decklink_src_audio_src_getrange (GstPad * pad,
    guint64 offset, guint length, GstBuffer ** buffer);
static gboolean gst_decklink_src_audio_src_event (GstPad * pad,
    GstEvent * event);
static gboolean gst_decklink_src_audio_src_query (GstPad * pad,
    GstQuery * query);
static GstIterator *gst_decklink_src_audio_src_iterintlink (GstPad * pad);


static GstCaps *gst_decklink_src_video_src_getcaps (GstPad * pad);
static gboolean gst_decklink_src_video_src_setcaps (GstPad * pad,
    GstCaps * caps);
static gboolean gst_decklink_src_video_src_acceptcaps (GstPad * pad,
    GstCaps * caps);
static void gst_decklink_src_video_src_fixatecaps (GstPad * pad,
    GstCaps * caps);
static gboolean gst_decklink_src_video_src_activate (GstPad * pad);
static gboolean gst_decklink_src_video_src_activatepush (GstPad * pad,
    gboolean active);
static gboolean gst_decklink_src_video_src_activatepull (GstPad * pad,
    gboolean active);
static GstPadLinkReturn gst_decklink_src_video_src_link (GstPad * pad,
    GstPad * peer);
static GstFlowReturn gst_decklink_src_video_src_getrange (GstPad * pad,
    guint64 offset, guint length, GstBuffer ** buffer);
static gboolean gst_decklink_src_video_src_event (GstPad * pad,
    GstEvent * event);
static gboolean gst_decklink_src_video_src_query (GstPad * pad,
    GstQuery * query);
static GstIterator *gst_decklink_src_video_src_iterintlink (GstPad * pad);

static void
gst_decklinksrc_property_probe_interface_init (GstPropertyProbeInterface *
    iface);

static void gst_decklink_src_task (void *priv);

#ifdef _MSC_VER
/* COM initialization/uninitialization thread */
static void gst_decklink_src_com_thread (GstDecklinkSrc * src);
#endif /* _MSC_VER */

enum
{
  PROP_0,
  PROP_MODE,
  PROP_CONNECTION,
  PROP_AUDIO_INPUT,
  PROP_DEVICE
};

/* pad templates */

static GstStaticPadTemplate gst_decklink_src_audio_src_template =
GST_STATIC_PAD_TEMPLATE ("audiosrc",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS ("audio/x-raw-int,width=16,depth=16,channels=2,rate=48000")
    );

/* the video source pad template is created on the fly */

/* class initialization */

static void
gst_decklinksrc_init_interfaces (GType type)
{
  static const GInterfaceInfo decklinksrc_propertyprobe_info = {
    (GInterfaceInitFunc) gst_decklinksrc_property_probe_interface_init,
    NULL,
    NULL,
  };

  GST_DEBUG_CATEGORY_INIT (gst_decklink_src_debug_category, "decklinksrc", 0,
      "debug category for decklinksrc element");

  g_type_add_interface_static (type, GST_TYPE_PROPERTY_PROBE,
      &decklinksrc_propertyprobe_info);
}

GST_BOILERPLATE_FULL (GstDecklinkSrc, gst_decklink_src, GstElement,
    GST_TYPE_ELEMENT, gst_decklinksrc_init_interfaces);

static void
gst_decklink_src_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_decklink_src_audio_src_template));
  gst_element_class_add_pad_template (element_class,
      gst_pad_template_new ("videosrc", GST_PAD_SRC, GST_PAD_ALWAYS,
          gst_decklink_mode_get_template_caps ()));

  gst_element_class_set_details_simple (element_class, "Decklink source",
      "Source/Video", "DeckLink Source", "David Schleef <ds@entropywave.com>");
}

static void
gst_decklink_src_class_init (GstDecklinkSrcClass * klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);

  gobject_class->set_property = gst_decklink_src_set_property;
  gobject_class->get_property = gst_decklink_src_get_property;
  gobject_class->dispose = gst_decklink_src_dispose;
  gobject_class->finalize = gst_decklink_src_finalize;
  element_class->request_new_pad =
      GST_DEBUG_FUNCPTR (gst_decklink_src_request_new_pad);
  element_class->release_pad = GST_DEBUG_FUNCPTR (gst_decklink_src_release_pad);
  element_class->change_state =
      GST_DEBUG_FUNCPTR (gst_decklink_src_change_state);
  element_class->provide_clock =
      GST_DEBUG_FUNCPTR (gst_decklink_src_provide_clock);
  element_class->set_clock = GST_DEBUG_FUNCPTR (gst_decklink_src_set_clock);
  element_class->get_index = GST_DEBUG_FUNCPTR (gst_decklink_src_get_index);
  element_class->set_index = GST_DEBUG_FUNCPTR (gst_decklink_src_set_index);
  element_class->send_event = GST_DEBUG_FUNCPTR (gst_decklink_src_send_event);
  element_class->query = GST_DEBUG_FUNCPTR (gst_decklink_src_query);

  g_object_class_install_property (gobject_class, PROP_MODE,
      g_param_spec_enum ("mode", "Mode", "Video Mode to use for capture",
          GST_TYPE_DECKLINK_MODE, GST_DECKLINK_MODE_NTSC,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
              G_PARAM_CONSTRUCT)));

  g_object_class_install_property (gobject_class, PROP_CONNECTION,
      g_param_spec_enum ("connection", "Connection",
          "Video Input Connection to use",
          GST_TYPE_DECKLINK_CONNECTION, GST_DECKLINK_CONNECTION_SDI,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
              G_PARAM_CONSTRUCT)));

  g_object_class_install_property (gobject_class, PROP_AUDIO_INPUT,
      g_param_spec_enum ("audio-input", "Audio Input",
          "Audio Input Connection",
          GST_TYPE_DECKLINK_AUDIO_CONNECTION,
          GST_DECKLINK_AUDIO_CONNECTION_AUTO,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
              G_PARAM_CONSTRUCT)));

  g_object_class_install_property (gobject_class, PROP_DEVICE,
      g_param_spec_int ("device", "Device", "Capture device instance to use",
          0, G_MAXINT, 0,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
              G_PARAM_CONSTRUCT)));
}

static void
gst_decklink_src_init (GstDecklinkSrc * decklinksrc,
    GstDecklinkSrcClass * decklinksrc_class)
{
  g_static_rec_mutex_init (&decklinksrc->task_mutex);
  decklinksrc->task = gst_task_create (gst_decklink_src_task, decklinksrc);
  gst_task_set_lock (decklinksrc->task, &decklinksrc->task_mutex);

  decklinksrc->audiosrcpad =
      gst_pad_new_from_static_template (&gst_decklink_src_audio_src_template,
      "audiosrc");
  gst_pad_set_getcaps_function (decklinksrc->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_audio_src_getcaps));
  gst_pad_set_setcaps_function (decklinksrc->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_audio_src_setcaps));
  gst_pad_set_acceptcaps_function (decklinksrc->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_audio_src_acceptcaps));
  gst_pad_set_fixatecaps_function (decklinksrc->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_audio_src_fixatecaps));
  gst_pad_set_activate_function (decklinksrc->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_audio_src_activate));
  gst_pad_set_activatepush_function (decklinksrc->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_audio_src_activatepush));
  gst_pad_set_activatepull_function (decklinksrc->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_audio_src_activatepull));
  gst_pad_set_link_function (decklinksrc->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_audio_src_link));
  gst_pad_set_getrange_function (decklinksrc->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_audio_src_getrange));
  gst_pad_set_event_function (decklinksrc->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_audio_src_event));
  gst_pad_set_query_function (decklinksrc->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_audio_src_query));
  gst_pad_set_iterate_internal_links_function (decklinksrc->audiosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_audio_src_iterintlink));
  gst_element_add_pad (GST_ELEMENT (decklinksrc), decklinksrc->audiosrcpad);



  decklinksrc->videosrcpad =
      gst_pad_new_from_template (gst_element_class_get_pad_template
      (GST_ELEMENT_CLASS (decklinksrc_class), "videosrc"), "videosrc");
  gst_pad_set_getcaps_function (decklinksrc->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_video_src_getcaps));
  gst_pad_set_setcaps_function (decklinksrc->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_video_src_setcaps));
  gst_pad_set_acceptcaps_function (decklinksrc->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_video_src_acceptcaps));
  gst_pad_set_fixatecaps_function (decklinksrc->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_video_src_fixatecaps));
  gst_pad_set_activate_function (decklinksrc->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_video_src_activate));
  gst_pad_set_activatepush_function (decklinksrc->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_video_src_activatepush));
  gst_pad_set_activatepull_function (decklinksrc->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_video_src_activatepull));
  gst_pad_set_link_function (decklinksrc->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_video_src_link));
  gst_pad_set_getrange_function (decklinksrc->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_video_src_getrange));
  gst_pad_set_event_function (decklinksrc->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_video_src_event));
  gst_pad_set_query_function (decklinksrc->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_video_src_query));
  gst_pad_set_iterate_internal_links_function (decklinksrc->videosrcpad,
      GST_DEBUG_FUNCPTR (gst_decklink_src_video_src_iterintlink));
  gst_element_add_pad (GST_ELEMENT (decklinksrc), decklinksrc->videosrcpad);


  decklinksrc->cond = g_cond_new ();
  decklinksrc->mutex = g_mutex_new ();

  decklinksrc->copy_data = TRUE;
  decklinksrc->mode = GST_DECKLINK_MODE_NTSC;
  decklinksrc->connection = GST_DECKLINK_CONNECTION_SDI;
  decklinksrc->audio_connection = GST_DECKLINK_AUDIO_CONNECTION_AUTO;
  decklinksrc->device = 0;

  decklinksrc->stop = FALSE;
  decklinksrc->dropped_frames = 0;
  decklinksrc->dropped_frames_old = 0;
  decklinksrc->frame_num = -1;  /* -1 so will be 0 after incrementing */

#ifdef _MSC_VER
  decklinksrc->com_init_lock = g_mutex_new ();
  decklinksrc->com_deinit_lock = g_mutex_new ();
  decklinksrc->com_initialized = g_cond_new ();
  decklinksrc->com_uninitialize = g_cond_new ();
  decklinksrc->com_uninitialized = g_cond_new ();

  g_mutex_lock (decklinksrc->com_init_lock);

  /* create the COM initialization thread */
  g_thread_create ((GThreadFunc) gst_decklink_src_com_thread,
      decklinksrc, FALSE, NULL);

  /* wait until the COM thread signals that COM has been initialized */
  g_cond_wait (decklinksrc->com_initialized, decklinksrc->com_init_lock);
  g_mutex_unlock (decklinksrc->com_init_lock);
#endif /* _MSC_VER */
}

void
gst_decklink_src_set_property (GObject * object, guint property_id,
    const GValue * value, GParamSpec * pspec)
{
  GstDecklinkSrc *decklinksrc;

  g_return_if_fail (GST_IS_DECKLINK_SRC (object));
  decklinksrc = GST_DECKLINK_SRC (object);

  switch (property_id) {
    case PROP_MODE:
      decklinksrc->mode = (GstDecklinkModeEnum) g_value_get_enum (value);
      break;
    case PROP_CONNECTION:
      decklinksrc->connection =
          (GstDecklinkConnectionEnum) g_value_get_enum (value);
      break;
    case PROP_AUDIO_INPUT:
      decklinksrc->audio_connection =
          (GstDecklinkAudioConnectionEnum) g_value_get_enum (value);
      break;
    case PROP_DEVICE:
      decklinksrc->device = g_value_get_int (value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
  }
}

void
gst_decklink_src_get_property (GObject * object, guint property_id,
    GValue * value, GParamSpec * pspec)
{
  GstDecklinkSrc *decklinksrc;

  g_return_if_fail (GST_IS_DECKLINK_SRC (object));
  decklinksrc = GST_DECKLINK_SRC (object);

  switch (property_id) {
    case PROP_MODE:
      g_value_set_enum (value, decklinksrc->mode);
      break;
    case PROP_CONNECTION:
      g_value_set_enum (value, decklinksrc->connection);
      break;
    case PROP_AUDIO_INPUT:
      g_value_set_enum (value, decklinksrc->audio_connection);
      break;
    case PROP_DEVICE:
      g_value_set_int (value, decklinksrc->device);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
  }
}

#ifdef _MSC_VER
static void
gst_decklink_src_com_thread (GstDecklinkSrc * src)
{
  HRESULT res;

  g_mutex_lock (src->com_init_lock);

  /* Initialize COM with a MTA for this process. This thread will
   * be the first one to enter the apartement and the last one to leave
   * it, unitializing COM properly */

  res = CoInitializeEx (0, COINIT_MULTITHREADED);
  if (res == S_FALSE)
    GST_WARNING_OBJECT (src,
        "COM has been already initialized in the same process");
  else if (res == RPC_E_CHANGED_MODE)
    GST_WARNING_OBJECT (src, "The concurrency model of COM has changed.");
  else
    GST_INFO_OBJECT (src, "COM intialized succesfully");

  src->comInitialized = TRUE;

  /* Signal other threads waiting on this condition that COM was initialized */
  g_cond_signal (src->com_initialized);

  g_mutex_unlock (src->com_init_lock);

  /* Wait until the unitialize condition is met to leave the COM apartement */
  g_mutex_lock (src->com_deinit_lock);
  g_cond_wait (src->com_uninitialize, src->com_deinit_lock);

  CoUninitialize ();
  GST_INFO_OBJECT (src, "COM unintialized succesfully");
  src->comInitialized = FALSE;
  g_cond_signal (src->com_uninitialized);
  g_mutex_unlock (src->com_deinit_lock);
}
#endif /* _MSC_VER */

void
gst_decklink_src_dispose (GObject * object)
{
  g_return_if_fail (GST_IS_DECKLINK_SRC (object));

  /* clean up as possible.  may be called multiple times */

  G_OBJECT_CLASS (parent_class)->dispose (object);
}

void
gst_decklink_src_finalize (GObject * object)
{
  GstDecklinkSrc *decklinksrc;

  g_return_if_fail (GST_IS_DECKLINK_SRC (object));
  decklinksrc = GST_DECKLINK_SRC (object);

  /* clean up object here */

  g_cond_free (decklinksrc->cond);
  g_mutex_free (decklinksrc->mutex);
  gst_task_set_lock (decklinksrc->task, NULL);
  g_object_unref (decklinksrc->task);
  if (decklinksrc->audio_caps) {
    gst_caps_unref (decklinksrc->audio_caps);
  }
  if (decklinksrc->video_caps) {
    gst_caps_unref (decklinksrc->video_caps);
  }
#ifdef _MSC_VER
  /* signal the COM thread that it should uninitialize COM */
  if (decklinksrc->comInitialized) {
    g_mutex_lock (decklinksrc->com_deinit_lock);
    g_cond_signal (decklinksrc->com_uninitialize);
    g_cond_wait (decklinksrc->com_uninitialized, decklinksrc->com_deinit_lock);
    g_mutex_unlock (decklinksrc->com_deinit_lock);
  }

  g_mutex_free (decklinksrc->com_init_lock);
  g_mutex_free (decklinksrc->com_deinit_lock);
  g_cond_free (decklinksrc->com_initialized);
  g_cond_free (decklinksrc->com_uninitialize);
  g_cond_free (decklinksrc->com_uninitialized);
#endif /* _MSC_VER */

  G_OBJECT_CLASS (parent_class)->finalize (object);
}



static GstPad *
gst_decklink_src_request_new_pad (GstElement * element, GstPadTemplate * templ,
    const gchar * name)
{

  return NULL;
}

static void
gst_decklink_src_release_pad (GstElement * element, GstPad * pad)
{

}

static gboolean
gst_decklink_src_start (GstElement * element)
{
  GstDecklinkSrc *decklinksrc = GST_DECKLINK_SRC (element);
  DeckLinkCaptureDelegate *delegate;
  //IDeckLinkDisplayModeIterator *mode_iterator;
  //IDeckLinkDisplayMode *mode;
  BMDAudioSampleType sample_depth;
  int channels;
  HRESULT ret;
  const GstDecklinkMode *mode;
  IDeckLinkConfiguration *config;
  BMDVideoConnection conn;
  BMDAudioConnection aconn;

  GST_DEBUG_OBJECT (decklinksrc, "start");

  decklinksrc->decklink = gst_decklink_get_nth_device (decklinksrc->device);
  if (decklinksrc->decklink == NULL) {
    return FALSE;
  }

  ret = decklinksrc->decklink->QueryInterface (IID_IDeckLinkInput,
      (void **) &decklinksrc->input);
  if (ret != S_OK) {
    GST_ERROR ("selected device does not have input interface");
    return FALSE;
  }

  delegate = new DeckLinkCaptureDelegate ();
  delegate->priv = decklinksrc;
  decklinksrc->input->SetCallback (delegate);

  ret = decklinksrc->decklink->QueryInterface (IID_IDeckLinkConfiguration,
      (void **) &config);
  if (ret != S_OK) {
    GST_ERROR ("query interface failed");
    return FALSE;
  }

  switch (decklinksrc->connection) {
    default:
    case GST_DECKLINK_CONNECTION_SDI:
      conn = bmdVideoConnectionSDI;
      aconn = bmdAudioConnectionEmbedded;
      break;
    case GST_DECKLINK_CONNECTION_HDMI:
      conn = bmdVideoConnectionHDMI;
      aconn = bmdAudioConnectionEmbedded;
      break;
    case GST_DECKLINK_CONNECTION_OPTICAL_SDI:
      conn = bmdVideoConnectionOpticalSDI;
      aconn = bmdAudioConnectionEmbedded;
      break;
    case GST_DECKLINK_CONNECTION_COMPONENT:
      conn = bmdVideoConnectionComponent;
      aconn = bmdAudioConnectionAnalog;
      break;
    case GST_DECKLINK_CONNECTION_COMPOSITE:
      conn = bmdVideoConnectionComposite;
      aconn = bmdAudioConnectionAnalog;
      break;
    case GST_DECKLINK_CONNECTION_SVIDEO:
      conn = bmdVideoConnectionSVideo;
      aconn = bmdAudioConnectionAnalog;
      break;
  }

  ret = config->SetInt (bmdDeckLinkConfigVideoInputConnection, conn);
  if (ret != S_OK) {
    GST_ERROR ("set configuration (input source)");
    return FALSE;
  }

  if (decklinksrc->connection == GST_DECKLINK_CONNECTION_COMPOSITE) {
    ret = config->SetInt (bmdDeckLinkConfigAnalogVideoInputFlags,
        bmdAnalogVideoFlagCompositeSetup75);
    if (ret != S_OK) {
      GST_ERROR ("set configuration (composite setup)");
      return FALSE;
    }
  }

  switch (decklinksrc->audio_connection) {
    default:
    case GST_DECKLINK_AUDIO_CONNECTION_AUTO:
      break;
    case GST_DECKLINK_AUDIO_CONNECTION_EMBEDDED:
      aconn = bmdAudioConnectionEmbedded;
      break;
    case GST_DECKLINK_AUDIO_CONNECTION_AES_EBU:
      aconn = bmdAudioConnectionAESEBU;
      break;
    case GST_DECKLINK_AUDIO_CONNECTION_ANALOG:
      aconn = bmdAudioConnectionAnalog;
      break;
  }
  ret = config->SetInt (bmdDeckLinkConfigAudioInputConnection, aconn);
  if (ret != S_OK) {
    GST_ERROR ("set configuration (audio input connection)");
    return FALSE;
  }
#if 0
  ret = decklinksrc->input->GetDisplayModeIterator (&mode_iterator);
  if (ret != S_OK) {
    GST_ERROR ("failed to get display mode iterator");
    return FALSE;
  }

  i = 0;
  while (mode_iterator->Next (&mode) == S_OK) {
    const char *mode_name;

    mode->GetName (&mode_name);

    GST_DEBUG ("%d: mode name: %s", i, mode_name);

    mode->Release ();
    i++;
  }
#endif

  mode = gst_decklink_get_mode (decklinksrc->mode);

  ret = decklinksrc->input->EnableVideoInput (mode->mode, bmdFormat8BitYUV, 0);
  if (ret != S_OK) {
    GST_ERROR ("enable video input failed");
    return FALSE;
  }

  sample_depth = bmdAudioSampleType16bitInteger;
  channels = 2;
  ret = decklinksrc->input->EnableAudioInput (bmdAudioSampleRate48kHz,
      sample_depth, channels);
  if (ret != S_OK) {
    GST_ERROR ("enable video input failed");
    return FALSE;
  }

  ret = decklinksrc->input->StartStreams ();
  if (ret != S_OK) {
    GST_ERROR ("start streams failed");
    return FALSE;
  }

  g_static_rec_mutex_lock (&decklinksrc->task_mutex);
  gst_task_start (decklinksrc->task);
  g_static_rec_mutex_unlock (&decklinksrc->task_mutex);

  return TRUE;
}

static gboolean
gst_decklink_src_stop (GstElement * element)
{
  GstDecklinkSrc *decklinksrc = GST_DECKLINK_SRC (element);

  gst_task_stop (decklinksrc->task);

  g_mutex_lock (decklinksrc->mutex);
  decklinksrc->stop = TRUE;
  g_cond_signal (decklinksrc->cond);
  g_mutex_unlock (decklinksrc->mutex);

  gst_task_join (decklinksrc->task);

  decklinksrc->input->StopStreams ();
  decklinksrc->input->DisableVideoInput ();
  decklinksrc->input->DisableAudioInput ();

  decklinksrc->input->Release ();
  decklinksrc->input = NULL;

  decklinksrc->decklink->Release ();
  decklinksrc->decklink = NULL;

  return TRUE;
}

static GstStateChangeReturn
gst_decklink_src_change_state (GstElement * element, GstStateChange transition)
{
  GstStateChangeReturn ret;
  gboolean no_preroll = FALSE;

  g_return_val_if_fail (GST_IS_DECKLINK_SRC (element),
      GST_STATE_CHANGE_FAILURE);

  switch (transition) {
    case GST_STATE_CHANGE_NULL_TO_READY:
      if (!gst_decklink_src_start (element)) {
        ret = GST_STATE_CHANGE_FAILURE;
        goto out;
      }
      break;
    case GST_STATE_CHANGE_READY_TO_PAUSED:
      no_preroll = TRUE;
      break;
    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
      break;
    default:
      break;
  }

  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);

  switch (transition) {
    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
      no_preroll = TRUE;
      break;
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      break;
    case GST_STATE_CHANGE_READY_TO_NULL:
      gst_decklink_src_stop (element);
      break;
    default:
      break;
  }

  if (no_preroll && ret == GST_STATE_CHANGE_SUCCESS)
    ret = GST_STATE_CHANGE_NO_PREROLL;

out:
  return ret;
}

static GstClock *
gst_decklink_src_provide_clock (GstElement * element)
{

  return NULL;
}

static gboolean
gst_decklink_src_set_clock (GstElement * element, GstClock * clock)
{

  return GST_ELEMENT_CLASS (parent_class)->set_clock (element, clock);
}

static GstIndex *
gst_decklink_src_get_index (GstElement * element)
{

  return NULL;
}

static void
gst_decklink_src_set_index (GstElement * element, GstIndex * index)
{

}

static gboolean
gst_decklink_src_send_event (GstElement * element, GstEvent * event)
{

  return TRUE;
}

static gboolean
gst_decklink_src_query (GstElement * element, GstQuery * query)
{
  GstDecklinkSrc *decklinksrc = GST_DECKLINK_SRC (element);
  gboolean ret;

  GST_DEBUG_OBJECT (decklinksrc, "query");

  switch (GST_QUERY_TYPE (query)) {
    default:
      ret = GST_ELEMENT_CLASS (parent_class)->query (element, query);
      break;
  }

  return ret;
}

static GstCaps *
gst_decklink_src_audio_src_getcaps (GstPad * pad)
{
  GstDecklinkSrc *decklinksrc;
  GstCaps *caps;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "getcaps");

  caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));

  gst_object_unref (decklinksrc);
  return caps;
}

static gboolean
gst_decklink_src_audio_src_setcaps (GstPad * pad, GstCaps * caps)
{
  GstDecklinkSrc *decklinksrc;
  GstCaps *pad_caps;
  gboolean can_intersect;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  pad_caps = gst_pad_get_caps_reffed (pad);
  can_intersect = gst_caps_can_intersect (pad_caps, caps);
  gst_caps_unref (pad_caps);

  GST_DEBUG_OBJECT (decklinksrc, "setcaps");


  gst_object_unref (decklinksrc);
  return can_intersect;
}

static gboolean
gst_decklink_src_audio_src_acceptcaps (GstPad * pad, GstCaps * caps)
{
  GstDecklinkSrc *decklinksrc;
  GstCaps *pad_caps;
  gboolean can_intersect;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  pad_caps = gst_pad_get_caps_reffed (pad);
  can_intersect = gst_caps_can_intersect (pad_caps, caps);
  gst_caps_unref (pad_caps);

  GST_DEBUG_OBJECT (decklinksrc, "acceptcaps");

  gst_object_unref (decklinksrc);
  return can_intersect;
}

static void
gst_decklink_src_audio_src_fixatecaps (GstPad * pad, GstCaps * caps)
{
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "fixatecaps");


  gst_object_unref (decklinksrc);
}

static gboolean
gst_decklink_src_audio_src_activate (GstPad * pad)
{
  GstDecklinkSrc *decklinksrc;
  gboolean ret;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "activate");

  if (gst_pad_check_pull_range (pad)) {
    GST_DEBUG_OBJECT (pad, "activating pull");
    ret = gst_pad_activate_pull (pad, TRUE);
  } else {
    GST_DEBUG_OBJECT (pad, "activating push");
    ret = gst_pad_activate_push (pad, TRUE);
  }

  gst_object_unref (decklinksrc);
  return ret;
}

static gboolean
gst_decklink_src_audio_src_activatepush (GstPad * pad, gboolean active)
{
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "activatepush");


  gst_object_unref (decklinksrc);
  return TRUE;
}

static gboolean
gst_decklink_src_audio_src_activatepull (GstPad * pad, gboolean active)
{
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "activatepull");

  gst_object_unref (decklinksrc);
  return FALSE;
}

static GstPadLinkReturn
gst_decklink_src_audio_src_link (GstPad * pad, GstPad * peer)
{
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "link");


  gst_object_unref (decklinksrc);
  return GST_PAD_LINK_OK;
}

static GstFlowReturn
gst_decklink_src_audio_src_getrange (GstPad * pad, guint64 offset, guint length,
    GstBuffer ** buffer)
{
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "getrange");


  gst_object_unref (decklinksrc);
  return GST_FLOW_OK;
}

static gboolean
gst_decklink_src_audio_src_event (GstPad * pad, GstEvent * event)
{
  gboolean res;
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "event");

  switch (GST_EVENT_TYPE (event)) {
    default:
      res = gst_pad_event_default (pad, event);
      break;
  }

  gst_object_unref (decklinksrc);
  return res;
}

static gboolean
gst_decklink_src_audio_src_query (GstPad * pad, GstQuery * query)
{
  gboolean res;
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "query");

  switch (GST_QUERY_TYPE (query)) {
    default:
      res = gst_pad_query_default (pad, query);
      break;
  }

  gst_object_unref (decklinksrc);
  return res;
}

static GstIterator *
gst_decklink_src_audio_src_iterintlink (GstPad * pad)
{
  GstDecklinkSrc *decklinksrc;
  GstIterator *iter;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "iterintlink");

  iter = gst_pad_iterate_internal_links_default (pad);

  gst_object_unref (decklinksrc);
  return iter;
}


static GstCaps *
gst_decklink_src_video_src_getcaps (GstPad * pad)
{
  GstDecklinkSrc *decklinksrc;
  GstCaps *caps;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "getcaps");

  caps = gst_decklink_mode_get_caps (decklinksrc->mode);

  gst_object_unref (decklinksrc);
  return caps;
}

static gboolean
gst_decklink_src_video_src_setcaps (GstPad * pad, GstCaps * caps)
{
  GstDecklinkSrc *decklinksrc;
  GstCaps *mode_caps;
  gboolean can_intersect;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "setcaps");

  mode_caps = gst_decklink_mode_get_caps (decklinksrc->mode);
  can_intersect = gst_caps_can_intersect (mode_caps, caps);
  gst_caps_unref (mode_caps);

  gst_object_unref (decklinksrc);
  return can_intersect;
}

static gboolean
gst_decklink_src_video_src_acceptcaps (GstPad * pad, GstCaps * caps)
{
  GstDecklinkSrc *decklinksrc;
  GstCaps *mode_caps;
  gboolean can_intersect;


  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "acceptcaps");

  mode_caps = gst_decklink_mode_get_caps (decklinksrc->mode);
  can_intersect = gst_caps_can_intersect (mode_caps, caps);
  gst_caps_unref (mode_caps);

  gst_object_unref (decklinksrc);
  return can_intersect;
}

static void
gst_decklink_src_video_src_fixatecaps (GstPad * pad, GstCaps * caps)
{
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "fixatecaps");


  gst_object_unref (decklinksrc);
}

static gboolean
gst_decklink_src_video_src_activate (GstPad * pad)
{
  GstDecklinkSrc *decklinksrc;
  gboolean ret;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "activate");

  if (gst_pad_check_pull_range (pad)) {
    GST_DEBUG_OBJECT (pad, "activating pull");
    ret = gst_pad_activate_pull (pad, TRUE);
  } else {
    GST_DEBUG_OBJECT (pad, "activating push");
    ret = gst_pad_activate_push (pad, TRUE);
  }

  gst_object_unref (decklinksrc);
  return ret;
}

static gboolean
gst_decklink_src_video_src_activatepush (GstPad * pad, gboolean active)
{
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "activatepush");


  gst_object_unref (decklinksrc);
  return TRUE;
}

static gboolean
gst_decklink_src_video_src_activatepull (GstPad * pad, gboolean active)
{
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "activatepull");


  gst_object_unref (decklinksrc);
  return FALSE;
}

static GstPadLinkReturn
gst_decklink_src_video_src_link (GstPad * pad, GstPad * peer)
{
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "link");


  gst_object_unref (decklinksrc);
  return GST_PAD_LINK_OK;
}

static GstFlowReturn
gst_decklink_src_video_src_getrange (GstPad * pad, guint64 offset, guint length,
    GstBuffer ** buffer)
{
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "getrange");


  gst_object_unref (decklinksrc);
  return GST_FLOW_OK;
}

static gboolean
gst_decklink_src_video_src_event (GstPad * pad, GstEvent * event)
{
  gboolean res;
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "event");

  switch (GST_EVENT_TYPE (event)) {
    default:
      res = gst_pad_event_default (pad, event);
      break;
  }

  gst_object_unref (decklinksrc);
  return res;
}

static gboolean
gst_decklink_src_video_src_query (GstPad * pad, GstQuery * query)
{
  gboolean ret = FALSE;
  GstDecklinkSrc *decklinksrc;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "query");

  switch (GST_QUERY_TYPE (query)) {
    case GST_QUERY_LATENCY:{
      GstClockTime min_latency, max_latency;
      const GstDecklinkMode *mode;

      /* device must be open */
      if (decklinksrc->decklink == NULL) {
        GST_WARNING_OBJECT (decklinksrc,
            "Can't give latency since device isn't open !");
        goto done;
      }

      mode = gst_decklink_get_mode (decklinksrc->mode);

      /* min latency is the time to capture one frame */
      min_latency =
          gst_util_uint64_scale_int (GST_SECOND, mode->fps_d, mode->fps_n);

      /* max latency is total duration of the frame buffer */
      max_latency = 2 * min_latency;

      GST_DEBUG_OBJECT (decklinksrc,
          "report latency min %" GST_TIME_FORMAT " max %" GST_TIME_FORMAT,
          GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));

      /* we are always live, the min latency is 1 frame and the max latency is
       * the complete buffer of frames. */
      gst_query_set_latency (query, TRUE, min_latency, max_latency);

      ret = TRUE;
      break;
    }
    default:
      ret = gst_pad_query_default (pad, query);
      break;
  }

done:
  gst_object_unref (decklinksrc);
  return ret;
}

static GstIterator *
gst_decklink_src_video_src_iterintlink (GstPad * pad)
{
  GstDecklinkSrc *decklinksrc;
  GstIterator *iter;

  decklinksrc = GST_DECKLINK_SRC (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (decklinksrc, "iterintlink");

  iter = gst_pad_iterate_internal_links_default (pad);

  gst_object_unref (decklinksrc);
  return iter;
}


static void
video_frame_free (void *data)
{
  IDeckLinkVideoInputFrame *video_frame = (IDeckLinkVideoInputFrame *) data;

  video_frame->Release ();
}

static void
gst_decklink_src_task (void *priv)
{
  GstDecklinkSrc *decklinksrc = GST_DECKLINK_SRC (priv);
  GstBuffer *buffer;
  GstBuffer *audio_buffer;
  IDeckLinkVideoInputFrame *video_frame;
  IDeckLinkAudioInputPacket *audio_frame;
  void *data;
  int n_samples;
  GstFlowReturn ret;
  const GstDecklinkMode *mode;

  GST_DEBUG_OBJECT (decklinksrc, "task");

  g_mutex_lock (decklinksrc->mutex);
  while (decklinksrc->video_frame == NULL && !decklinksrc->stop) {
    g_cond_wait (decklinksrc->cond, decklinksrc->mutex);
  }
  video_frame = decklinksrc->video_frame;
  audio_frame = decklinksrc->audio_frame;
  decklinksrc->video_frame = NULL;
  decklinksrc->audio_frame = NULL;
  g_mutex_unlock (decklinksrc->mutex);

  if (decklinksrc->stop) {
    GST_DEBUG ("stopping task");
    return;
  }

  /* warning on dropped frames */
  if (decklinksrc->dropped_frames - decklinksrc->dropped_frames_old > 0) {
    GST_ELEMENT_WARNING (decklinksrc, RESOURCE, READ,
        ("Dropped %d frame(s), for a total of %d frame(s)",
            decklinksrc->dropped_frames - decklinksrc->dropped_frames_old,
            decklinksrc->dropped_frames), (NULL));
    decklinksrc->dropped_frames_old = decklinksrc->dropped_frames;
  }

  if (!decklinksrc->video_new_segment) {
    GstEvent *event;
    gboolean ret;

    event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME,
        0, GST_CLOCK_TIME_NONE, 0);

    ret = gst_pad_push_event (decklinksrc->videosrcpad, event);
    if (!ret) {
      GST_WARNING ("new segment event not handled");
    }

    decklinksrc->video_new_segment = TRUE;
  }

  mode = gst_decklink_get_mode (decklinksrc->mode);

  video_frame->GetBytes (&data);
  if (decklinksrc->copy_data) {
    buffer = gst_buffer_new_and_alloc (mode->width * mode->height * 2);

    memcpy (GST_BUFFER_DATA (buffer), data, mode->width * mode->height * 2);

    video_frame->Release ();
  } else {
    buffer = gst_buffer_new ();
    GST_BUFFER_SIZE (buffer) = mode->width * mode->height * 2;

    GST_BUFFER_DATA (buffer) = (guint8 *) data;

    GST_BUFFER_FREE_FUNC (buffer) = video_frame_free;
    GST_BUFFER_MALLOCDATA (buffer) = (guint8 *) video_frame;
  }

  GST_BUFFER_TIMESTAMP (buffer) =
      gst_util_uint64_scale_int (decklinksrc->frame_num * GST_SECOND,
      mode->fps_d, mode->fps_n);
  GST_BUFFER_DURATION (buffer) =
      gst_util_uint64_scale_int ((decklinksrc->frame_num + 1) * GST_SECOND,
      mode->fps_d, mode->fps_n) - GST_BUFFER_TIMESTAMP (buffer);
  GST_BUFFER_OFFSET (buffer) = decklinksrc->frame_num;
  GST_BUFFER_OFFSET_END (buffer) = decklinksrc->frame_num;
  if (decklinksrc->frame_num == 0) {
    GstEvent *event;
    gboolean ret;

    GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);

    event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME, 0,
        GST_CLOCK_TIME_NONE, 0);

    if (gst_pad_is_linked (decklinksrc->videosrcpad)) {
      gst_event_ref (event);
      ret = gst_pad_push_event (decklinksrc->videosrcpad, event);
      if (!ret) {
        GST_ERROR_OBJECT (decklinksrc, "new segment event ret=%d", ret);
        gst_event_unref (event);
        return;
      }
    } else {
      gst_event_unref (event);
    }

    if (gst_pad_is_linked (decklinksrc->audiosrcpad)) {
      ret = gst_pad_push_event (decklinksrc->audiosrcpad, event);
      if (!ret) {
        GST_ERROR_OBJECT (decklinksrc, "new segment event ret=%d", ret);
        gst_event_unref (event);
      }
    } else {
      gst_event_unref (event);
    }

  }

  if (decklinksrc->video_caps == NULL) {
    decklinksrc->video_caps = gst_decklink_mode_get_caps (decklinksrc->mode);
  }
  gst_buffer_set_caps (buffer, decklinksrc->video_caps);

  ret = gst_pad_push (decklinksrc->videosrcpad, buffer);
  if (!(ret == GST_FLOW_OK || ret == GST_FLOW_NOT_LINKED ||
          ret == GST_FLOW_WRONG_STATE)) {
    GST_ELEMENT_ERROR (decklinksrc, STREAM, FAILED,
        ("Internal data stream error."),
        ("stream stopped, reason %s", gst_flow_get_name (ret)));
  }

  if (gst_pad_is_linked (decklinksrc->audiosrcpad)) {
    if (!decklinksrc->audio_new_segment) {
      GstEvent *event;
      gboolean ret;

      event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME,
          0, GST_CLOCK_TIME_NONE, 0);

      ret = gst_pad_push_event (decklinksrc->audiosrcpad, event);
      if (!ret) {
        GST_WARNING ("new segment event not handled");
      }

      decklinksrc->audio_new_segment = TRUE;
    }

    n_samples = audio_frame->GetSampleFrameCount ();
    audio_frame->GetBytes (&data);
    audio_buffer = gst_buffer_new_and_alloc (n_samples * 2 * 2);
    memcpy (GST_BUFFER_DATA (audio_buffer), data, n_samples * 2 * 2);

    GST_BUFFER_TIMESTAMP (audio_buffer) =
        gst_util_uint64_scale_int (decklinksrc->num_audio_samples * GST_SECOND,
        1, 48000);
    GST_BUFFER_DURATION (audio_buffer) =
        gst_util_uint64_scale_int (n_samples * GST_SECOND, 1, 48000);
    decklinksrc->num_audio_samples += n_samples;

    if (decklinksrc->audio_caps == NULL) {
      decklinksrc->audio_caps = gst_caps_new_simple ("audio/x-raw-int",
          "endianness", G_TYPE_INT, G_LITTLE_ENDIAN,
          "signed", G_TYPE_BOOLEAN, TRUE,
          "depth", G_TYPE_INT, 16,
          "width", G_TYPE_INT, 16,
          "channels", G_TYPE_INT, 2, "rate", G_TYPE_INT, 48000, NULL);
    }
    gst_buffer_set_caps (audio_buffer, decklinksrc->audio_caps);

    ret = gst_pad_push (decklinksrc->audiosrcpad, audio_buffer);
    if (!(ret == GST_FLOW_OK || ret == GST_FLOW_NOT_LINKED ||
            ret == GST_FLOW_WRONG_STATE)) {
      GST_ELEMENT_ERROR (decklinksrc, STREAM, FAILED,
          ("Internal data stream error."),
          ("stream stopped, reason %s", gst_flow_get_name (ret)));
    }
  }
  audio_frame->Release ();
}


static const GList *
gst_decklinksrc_probe_get_properties (GstPropertyProbe * probe)
{
  GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
  static GList *list = NULL;
  static gsize init = 0;

  if (g_once_init_enter (&init)) {
    list = g_list_append (NULL, g_object_class_find_property (klass, "device"));

    g_once_init_leave (&init, 1);
  }

  return list;
}

static gboolean probed = FALSE;
static int n_devices;

static void
gst_decklinksrc_class_probe_devices (GstElementClass * klass)
{
  IDeckLinkIterator *iterator;
  IDeckLink *decklink;

  n_devices = 0;
  iterator = CreateDeckLinkIteratorInstance ();
  if (iterator) {
    while (iterator->Next (&decklink) == S_OK) {
      n_devices++;
    }
  }

  probed = TRUE;
}

static void
gst_decklinksrc_probe_probe_property (GstPropertyProbe * probe,
    guint prop_id, const GParamSpec * pspec)
{
  GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);

  switch (prop_id) {
    case PROP_DEVICE:
      gst_decklinksrc_class_probe_devices (klass);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
      break;
  }
}

static gboolean
gst_decklinksrc_probe_needs_probe (GstPropertyProbe * probe,
    guint prop_id, const GParamSpec * pspec)
{
  gboolean ret = FALSE;

  switch (prop_id) {
    case PROP_DEVICE:
      ret = !probed;
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
      break;
  }
  return ret;
}

static GValueArray *
gst_decklinksrc_class_list_devices (GstElementClass * klass)
{
  GValueArray *array;
  GValue value = { 0 };
  GList *item;
  int i;

  array = g_value_array_new (n_devices);
  g_value_init (&value, G_TYPE_INT);
  for (i = 0; i < n_devices; i++) {
    g_value_set_int (&value, i);
    g_value_array_append (array, &value);

    item = item->next;
  }
  g_value_unset (&value);

  return array;
}

static GValueArray *
gst_decklinksrc_probe_get_values (GstPropertyProbe * probe,
    guint prop_id, const GParamSpec * pspec)
{
  GstElementClass *klass = GST_ELEMENT_GET_CLASS (probe);
  GValueArray *array = NULL;

  switch (prop_id) {
    case PROP_DEVICE:
      array = gst_decklinksrc_class_list_devices (klass);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
      break;
  }

  return array;
}

static void
gst_decklinksrc_property_probe_interface_init (GstPropertyProbeInterface *
    iface)
{
  iface->get_properties = gst_decklinksrc_probe_get_properties;
  iface->probe_property = gst_decklinksrc_probe_probe_property;
  iface->needs_probe = gst_decklinksrc_probe_needs_probe;
  iface->get_values = gst_decklinksrc_probe_get_values;
}