gstdecklinkvideosink.cpp 59 KB
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/* GStreamer
 * Copyright (C) 2011 David Schleef <ds@entropywave.com>
 * Copyright (C) 2014 Sebastian Dröge <sebastian@centricular.com>
 *
 * 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.
 */
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/**
 * SECTION:element-decklinkvideosink
 * @short_description: Outputs Video to a BlackMagic DeckLink Device
 *
 * Playout Video to a BlackMagic DeckLink Device.
 *
 * ## Sample pipeline
 * |[
 * gst-launch-1.0 \
 *   videotestsrc ! \
 *   decklinkvideosink device-number=0 mode=1080p25
 * ]|
 * Playout a 1080p25 test-video to the SDI-Out of Card 0. Devices are numbered
 * starting with 0.
 *
 * # Duplex-Mode:
 * Certain DechLink Cards like the Duo2 or the Quad2 contain two or four
 * independant SDI units with two connectors each. These units can operate either
 * in half- or in full-duplex mode.
 *
 * The Duplex-Mode of a Card can be configured using the `duplex-mode`-Property.
 * Cards that to not support Duplex-Modes are not influenced by the property.
 *
 * ## Half-Duplex-Mode (default):
 * By default decklinkvideosink will configure them into half-duplex mode, so that
 * each connector acts as if it were an independant DeckLink Card which can either
 * be used as an Input or as an Output. In this mode the Duo2 can be used as as 4 SDI
 * In-/Outputs and the Quad2 as 8 SDI In-/Outputs.
 *
 * |[
 *  gst-launch-1.0 \
 *    videotestsrc foreground-color=0x00ff0000 ! decklinkvideosink device-number=0 mode=1080p25 \
 *    videotestsrc foreground-color=0x0000ff00 ! decklinkvideosink device-number=1 mode=1080p25 \
 *    videotestsrc foreground-color=0x000000ff ! decklinkvideosink device-number=2 mode=1080p25 \
 *    videotestsrc foreground-color=0x00ffffff ! decklinkvideosink device-number=3 mode=1080p25
 * ]|
 * Playout four Test-Screen with colored Snow on the first four units in the System
 * (ie. the Connectors 1-4 of a Duo2 unit).
 *
 * |[
 *  gst-launch-1.0 \
 *    videotestsrc is-live=true foreground-color=0x0000ff00 ! decklinkvideosink device-number=0 mode=1080p25 \
 *    decklinkvideosrc device-number=1 mode=1080p25 ! autovideosink \
 *    decklinkvideosrc device-number=2 mode=1080p25 ! autovideosink \
 *    videotestsrc is-live=true foreground-color=0x00ff0000 ! decklinkvideosink device-number=3 mode=1080p25
 * ]|
 * Capture 1080p25 from the second and third unit in the System,
 * Playout a Test-Screen with colored Snow on the first and fourth unit
 * (ie. the Connectors 1-4 of a Duo2 unit).
 *
 * ## Device-Number-Mapping in Half-Duplex-Mode
 * The device-number to connector-mapping is as follows for the Duo2
 * - `device-number=0` SDI1
 * - `device-number=1` SDI3
 * - `device-number=2` SDI2
 * - `device-number=3` SDI4
 *
 * And for the Quad2
 * - `device-number=0` SDI1
 * - `device-number=1` SDI3
 * - `device-number=2` SDI5
 * - `device-number=3` SDI7
 * - `device-number=4` SDI2
 * - `device-number=5` SDI4
 * - `device-number=6` SDI6
 * - `device-number=7` SDI8
 *
 * ## Full-Duplex-Mode:
 * When operating in full-duplex mode, two connectors of a unit are combined to
 * a single device, performing keying with the second connection.
 *
 * ## Device-Number-Mapping in Full-Duplex-Mode
 * The device-number to connector-mapping in full-duplex-mode is as follows for the Duo2
 * - `device-number=0` SDI1 primary, SDI2 secondary
 * - `device-number=1` SDI3 primaty, SDI4 secondary
 *
 * And for the Quad2
 * - `device-number=0` SDI1 primary, SDI2 secondary
 * - `device-number=1` SDI3 primaty, SDI4 secondary
 * - `device-number=2` SDI5 primary, SDI6 secondary
 * - `device-number=3` SDI7 primary, SDI8 secondary
 *
 * # Keying
 * Keying is the process of overlaing Video with an Alpha-Channel on top of an
 * existing Video-Stream. The Duo2 and Quad2-Cards can perform two different
 * Keying-Modes when operated in full-duplex mode. Both modes expect Video with
 * an Alpha-Channel.
 *
 * ## Internal Keyer:
 * In internal Keying-Mode the primary port becomes an Input and the secondary port
 * an Output. The unit overlays Video played back from the Computer onto the Input
 * and outputs the combined Video-Stream to the Output.
 *
 * |[
 * gst-launch-1.0 \
 *  videotestsrc foreground-color=0x00000000 background-color=0x00000000 ! \
 *  video/x-raw,format=BGRA,width=1920,height=1080 ! \
 *  decklinkvideosink device-number=0 duplex-mode=full keyer-mode=internal video-format=8bit-bgra mode=1080p25
 * ]|
 *
 * ## External Keyer:
 * In external Keying-Mode the primary port outputs the alpha-chanel as the
 * luma-value (key-channel). Transparent pixels are black, opaque pixels are white.
 * The RGB-Component of the Video are output on the secondary channel.
 *
 * |[
 * gst-launch-1.0 \
 *  videotestsrc foreground-color=0x00000000 background-color=0x00000000 ! \
 *  video/x-raw,format=BGRA,width=1920,height=1080 ! \
 *  decklinkvideosink device-number=0 duplex-mode=full keyer-mode=external video-format=8bit-bgra mode=1080p25
 * ]|
 */
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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "gstdecklinkvideosink.h"
#include <string.h>

GST_DEBUG_CATEGORY_STATIC (gst_decklink_video_sink_debug);
#define GST_CAT_DEFAULT gst_decklink_video_sink_debug

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class GStreamerVideoOutputCallback:public IDeckLinkVideoOutputCallback
{
public:
  GStreamerVideoOutputCallback (GstDecklinkVideoSink * sink)
  :IDeckLinkVideoOutputCallback (), m_refcount (1)
  {
    m_sink = GST_DECKLINK_VIDEO_SINK_CAST (gst_object_ref (sink));
    g_mutex_init (&m_mutex);
  }

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  virtual HRESULT WINAPI QueryInterface (REFIID, LPVOID *)
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  {
    return E_NOINTERFACE;
  }

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  virtual ULONG WINAPI AddRef (void)
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  {
    ULONG ret;

    g_mutex_lock (&m_mutex);
    m_refcount++;
    ret = m_refcount;
    g_mutex_unlock (&m_mutex);

    return ret;
  }

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  virtual ULONG WINAPI Release (void)
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  {
    ULONG ret;

    g_mutex_lock (&m_mutex);
    m_refcount--;
    ret = m_refcount;
    g_mutex_unlock (&m_mutex);

    if (ret == 0) {
      delete this;
    }

    return ret;
  }

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  virtual HRESULT WINAPI ScheduledFrameCompleted (IDeckLinkVideoFrame *
      completedFrame, BMDOutputFrameCompletionResult result)
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  {
    switch (result) {
      case bmdOutputFrameCompleted:
        GST_LOG_OBJECT (m_sink, "Completed frame %p", completedFrame);
        break;
      case bmdOutputFrameDisplayedLate:
        GST_INFO_OBJECT (m_sink, "Late Frame %p", completedFrame);
        break;
      case bmdOutputFrameDropped:
        GST_INFO_OBJECT (m_sink, "Dropped Frame %p", completedFrame);
        break;
      case bmdOutputFrameFlushed:
        GST_DEBUG_OBJECT (m_sink, "Flushed Frame %p", completedFrame);
        break;
      default:
        GST_INFO_OBJECT (m_sink, "Unknown Frame %p: %d", completedFrame,
            (gint) result);
        break;
    }

    return S_OK;
  }

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  virtual HRESULT WINAPI ScheduledPlaybackHasStopped (void)
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  {
    GST_LOG_OBJECT (m_sink, "Scheduled playback stopped");

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    if (m_sink->output) {
      g_mutex_lock (&m_sink->output->lock);
      g_cond_signal (&m_sink->output->cond);
      g_mutex_unlock (&m_sink->output->lock);
    }

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    return S_OK;
  }

  virtual ~ GStreamerVideoOutputCallback () {
    gst_object_unref (m_sink);
    g_mutex_clear (&m_mutex);
  }

private:
  GstDecklinkVideoSink * m_sink;
  GMutex m_mutex;
  gint m_refcount;
};

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enum
{
  PROP_0,
  PROP_MODE,
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  PROP_DEVICE_NUMBER,
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  PROP_VIDEO_FORMAT,
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  PROP_DUPLEX_MODE,
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  PROP_TIMECODE_FORMAT,
  PROP_KEYER_MODE,
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  PROP_KEYER_LEVEL,
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  PROP_HW_SERIAL_NUMBER,
  PROP_CC_LINE,
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  PROP_AFD_BAR_LINE,
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};

static void gst_decklink_video_sink_set_property (GObject * object,
    guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_decklink_video_sink_get_property (GObject * object,
    guint property_id, GValue * value, GParamSpec * pspec);
static void gst_decklink_video_sink_finalize (GObject * object);

static GstStateChangeReturn
gst_decklink_video_sink_change_state (GstElement * element,
    GstStateChange transition);
static GstClock *gst_decklink_video_sink_provide_clock (GstElement * element);

static GstCaps *gst_decklink_video_sink_get_caps (GstBaseSink * bsink,
    GstCaps * filter);
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static gboolean gst_decklink_video_sink_set_caps (GstBaseSink * bsink,
    GstCaps * caps);
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static GstFlowReturn gst_decklink_video_sink_prepare (GstBaseSink * bsink,
    GstBuffer * buffer);
static GstFlowReturn gst_decklink_video_sink_render (GstBaseSink * bsink,
    GstBuffer * buffer);
static gboolean gst_decklink_video_sink_open (GstBaseSink * bsink);
static gboolean gst_decklink_video_sink_close (GstBaseSink * bsink);
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static gboolean gst_decklink_video_sink_stop (GstDecklinkVideoSink * self);
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static gboolean gst_decklink_video_sink_propose_allocation (GstBaseSink * bsink,
    GstQuery * query);
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static gboolean gst_decklink_video_sink_event (GstBaseSink * bsink,
    GstEvent * event);
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static void
gst_decklink_video_sink_start_scheduled_playback (GstElement * element);

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#define parent_class gst_decklink_video_sink_parent_class
G_DEFINE_TYPE (GstDecklinkVideoSink, gst_decklink_video_sink,
    GST_TYPE_BASE_SINK);

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static gboolean
reset_framerate (GstCapsFeatures * features, GstStructure * structure,
    gpointer user_data)
{
  gst_structure_set (structure, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1,
      G_MAXINT, 1, NULL);

  return TRUE;
}

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static void
gst_decklink_video_sink_class_init (GstDecklinkVideoSinkClass * klass)
{
  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
  GstBaseSinkClass *basesink_class = GST_BASE_SINK_CLASS (klass);
  GstCaps *templ_caps;

  gobject_class->set_property = gst_decklink_video_sink_set_property;
  gobject_class->get_property = gst_decklink_video_sink_get_property;
  gobject_class->finalize = gst_decklink_video_sink_finalize;

  element_class->change_state =
      GST_DEBUG_FUNCPTR (gst_decklink_video_sink_change_state);
  element_class->provide_clock =
      GST_DEBUG_FUNCPTR (gst_decklink_video_sink_provide_clock);

  basesink_class->get_caps =
      GST_DEBUG_FUNCPTR (gst_decklink_video_sink_get_caps);
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  basesink_class->set_caps =
      GST_DEBUG_FUNCPTR (gst_decklink_video_sink_set_caps);
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  basesink_class->prepare = GST_DEBUG_FUNCPTR (gst_decklink_video_sink_prepare);
  basesink_class->render = GST_DEBUG_FUNCPTR (gst_decklink_video_sink_render);
  // FIXME: These are misnamed in basesink!
  basesink_class->start = GST_DEBUG_FUNCPTR (gst_decklink_video_sink_open);
  basesink_class->stop = GST_DEBUG_FUNCPTR (gst_decklink_video_sink_close);
  basesink_class->propose_allocation =
      GST_DEBUG_FUNCPTR (gst_decklink_video_sink_propose_allocation);
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  basesink_class->event = GST_DEBUG_FUNCPTR (gst_decklink_video_sink_event);
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  g_object_class_install_property (gobject_class, PROP_MODE,
      g_param_spec_enum ("mode", "Playback Mode",
          "Video Mode to use for playback",
          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_DEVICE_NUMBER,
      g_param_spec_int ("device-number", "Device number",
          "Output device instance to use", 0, G_MAXINT, 0,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
              G_PARAM_CONSTRUCT)));

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  g_object_class_install_property (gobject_class, PROP_VIDEO_FORMAT,
      g_param_spec_enum ("video-format", "Video format",
          "Video format type to use for playback",
          GST_TYPE_DECKLINK_VIDEO_FORMAT, GST_DECKLINK_VIDEO_FORMAT_8BIT_YUV,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
              G_PARAM_CONSTRUCT)));

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  g_object_class_install_property (gobject_class, PROP_DUPLEX_MODE,
      g_param_spec_enum ("duplex-mode", "Duplex mode",
          "Certain DeckLink devices such as the DeckLink Quad 2 and the "
          "DeckLink Duo 2 support configuration of the duplex mode of "
          "individual sub-devices."
          "A sub-device configured as full-duplex will use two connectors, "
          "which allows simultaneous capture and playback, internal keying, "
          "and fill & key scenarios."
          "A half-duplex sub-device will use a single connector as an "
          "individual capture or playback channel.",
          GST_TYPE_DECKLINK_DUPLEX_MODE, GST_DECKLINK_DUPLEX_MODE_HALF,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
              G_PARAM_CONSTRUCT)));

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  g_object_class_install_property (gobject_class, PROP_TIMECODE_FORMAT,
      g_param_spec_enum ("timecode-format", "Timecode format",
          "Timecode format type to use for playback",
          GST_TYPE_DECKLINK_TIMECODE_FORMAT,
          GST_DECKLINK_TIMECODE_FORMAT_RP188ANY,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
              G_PARAM_CONSTRUCT)));

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  g_object_class_install_property (gobject_class, PROP_KEYER_MODE,
      g_param_spec_enum ("keyer-mode", "Keyer mode",
          "Keyer mode to be enabled",
          GST_TYPE_DECKLINK_KEYER_MODE,
          GST_DECKLINK_KEYER_MODE_OFF,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
              G_PARAM_CONSTRUCT)));

  g_object_class_install_property (gobject_class, PROP_KEYER_LEVEL,
      g_param_spec_int ("keyer-level", "Keyer level",
          "Keyer level", 0, 255, 255,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
              G_PARAM_CONSTRUCT)));

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  g_object_class_install_property (gobject_class, PROP_HW_SERIAL_NUMBER,
      g_param_spec_string ("hw-serial-number", "Hardware serial number",
          "The serial number (hardware ID) of the Decklink card",
          NULL, (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));

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  g_object_class_install_property (gobject_class, PROP_CC_LINE,
      g_param_spec_int ("cc-line", "CC Line",
          "Line number to use for inserting closed captions (0 = disabled)", 0,
          22, 0,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
              G_PARAM_CONSTRUCT)));

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  g_object_class_install_property (gobject_class, PROP_AFD_BAR_LINE,
      g_param_spec_int ("afd-bar-line", "AFD/Bar Line",
          "Line number to use for inserting AFD/Bar data (0 = disabled)", 0,
          10000, 0,
          (GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS |
              G_PARAM_CONSTRUCT)));

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  templ_caps = gst_decklink_mode_get_template_caps (FALSE);
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  templ_caps = gst_caps_make_writable (templ_caps);
  /* For output we support any framerate and only really care about timestamps */
  gst_caps_map_in_place (templ_caps, reset_framerate, NULL);
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  gst_element_class_add_pad_template (element_class,
      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, templ_caps));
  gst_caps_unref (templ_caps);

  gst_element_class_set_static_metadata (element_class, "Decklink Video Sink",
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      "Video/Sink/Hardware", "Decklink Sink",
      "David Schleef <ds@entropywave.com>, "
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      "Sebastian Dröge <sebastian@centricular.com>");

  GST_DEBUG_CATEGORY_INIT (gst_decklink_video_sink_debug, "decklinkvideosink",
      0, "debug category for decklinkvideosink element");
}

static void
gst_decklink_video_sink_init (GstDecklinkVideoSink * self)
{
  self->mode = GST_DECKLINK_MODE_NTSC;
  self->device_number = 0;
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  self->video_format = GST_DECKLINK_VIDEO_FORMAT_8BIT_YUV;
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  self->duplex_mode = bmdDuplexModeHalf;
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  /* VITC is legacy, we should expect RP188 in modern use cases */
  self->timecode_format = bmdTimecodeRP188Any;
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  self->caption_line = 0;
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  self->afd_bar_line = 0;
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  gst_base_sink_set_max_lateness (GST_BASE_SINK_CAST (self), 20 * GST_MSECOND);
  gst_base_sink_set_qos_enabled (GST_BASE_SINK_CAST (self), TRUE);
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}

void
gst_decklink_video_sink_set_property (GObject * object, guint property_id,
    const GValue * value, GParamSpec * pspec)
{
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (object);

  switch (property_id) {
    case PROP_MODE:
      self->mode = (GstDecklinkModeEnum) g_value_get_enum (value);
      break;
    case PROP_DEVICE_NUMBER:
      self->device_number = g_value_get_int (value);
      break;
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    case PROP_VIDEO_FORMAT:
      self->video_format = (GstDecklinkVideoFormat) g_value_get_enum (value);
      switch (self->video_format) {
        case GST_DECKLINK_VIDEO_FORMAT_AUTO:
        case GST_DECKLINK_VIDEO_FORMAT_8BIT_YUV:
        case GST_DECKLINK_VIDEO_FORMAT_10BIT_YUV:
        case GST_DECKLINK_VIDEO_FORMAT_8BIT_ARGB:
        case GST_DECKLINK_VIDEO_FORMAT_8BIT_BGRA:
          break;
        default:
          GST_ELEMENT_WARNING (GST_ELEMENT (self), CORE, NOT_IMPLEMENTED,
              ("Format %d not supported", self->video_format), (NULL));
          break;
      }
      break;
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    case PROP_DUPLEX_MODE:
      self->duplex_mode =
          gst_decklink_duplex_mode_from_enum ((GstDecklinkDuplexMode)
          g_value_get_enum (value));
      break;
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    case PROP_TIMECODE_FORMAT:
      self->timecode_format =
          gst_decklink_timecode_format_from_enum ((GstDecklinkTimecodeFormat)
          g_value_get_enum (value));
      break;
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    case PROP_KEYER_MODE:
      self->keyer_mode =
          gst_decklink_keyer_mode_from_enum ((GstDecklinkKeyerMode)
          g_value_get_enum (value));
      break;
    case PROP_KEYER_LEVEL:
      self->keyer_level = g_value_get_int (value);
      break;
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    case PROP_CC_LINE:
      self->caption_line = g_value_get_int (value);
      break;
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    case PROP_AFD_BAR_LINE:
      self->afd_bar_line = g_value_get_int (value);
      break;
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    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
  }
}

void
gst_decklink_video_sink_get_property (GObject * object, guint property_id,
    GValue * value, GParamSpec * pspec)
{
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (object);

  switch (property_id) {
    case PROP_MODE:
      g_value_set_enum (value, self->mode);
      break;
    case PROP_DEVICE_NUMBER:
      g_value_set_int (value, self->device_number);
      break;
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    case PROP_VIDEO_FORMAT:
      g_value_set_enum (value, self->video_format);
      break;
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    case PROP_DUPLEX_MODE:
      g_value_set_enum (value,
          gst_decklink_duplex_mode_to_enum (self->duplex_mode));
      break;
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    case PROP_TIMECODE_FORMAT:
      g_value_set_enum (value,
          gst_decklink_timecode_format_to_enum (self->timecode_format));
      break;
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    case PROP_KEYER_MODE:
      g_value_set_enum (value,
          gst_decklink_keyer_mode_to_enum (self->keyer_mode));
      break;
    case PROP_KEYER_LEVEL:
      g_value_set_int (value, self->keyer_level);
      break;
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    case PROP_HW_SERIAL_NUMBER:
      if (self->output)
        g_value_set_string (value, self->output->hw_serial_number);
      else
        g_value_set_string (value, NULL);
      break;
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    case PROP_CC_LINE:
      g_value_set_int (value, self->caption_line);
      break;
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    case PROP_AFD_BAR_LINE:
      g_value_set_int (value, self->afd_bar_line);
      break;
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    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
  }
}

void
gst_decklink_video_sink_finalize (GObject * object)
{
  //GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (object);

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

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static gboolean
gst_decklink_video_sink_set_caps (GstBaseSink * bsink, GstCaps * caps)
{
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (bsink);
  const GstDecklinkMode *mode;
  HRESULT ret;
553
  BMDVideoOutputFlags flags;
554
  GstVideoInfo info;
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  GST_DEBUG_OBJECT (self, "Setting caps %" GST_PTR_FORMAT, caps);

558
  if (!gst_video_info_from_caps (&info, caps))
559 560
    return FALSE;

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  g_mutex_lock (&self->output->lock);
  if (self->output->video_enabled) {
    if (self->info.finfo->format == info.finfo->format &&
        self->info.width == info.width && self->info.height == info.height) {
      // FIXME: We should also consider the framerate as it is used
      // for mode selection below in auto mode
      GST_DEBUG_OBJECT (self, "Nothing relevant has changed");
      self->info = info;
      g_mutex_unlock (&self->output->lock);
      return TRUE;
    } else {
      GST_DEBUG_OBJECT (self, "Reconfiguration not supported at this point");
      g_mutex_unlock (&self->output->lock);
      return FALSE;
    }
  }
  g_mutex_unlock (&self->output->lock);

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  self->output->output->SetScheduledFrameCompletionCallback (new
      GStreamerVideoOutputCallback (self));

583
  if (self->mode == GST_DECKLINK_MODE_AUTO) {
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    BMDPixelFormat f;
    mode = gst_decklink_find_mode_and_format_for_caps (caps, &f);
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    if (mode == NULL) {
      GST_WARNING_OBJECT (self,
          "Failed to find compatible mode for caps  %" GST_PTR_FORMAT, caps);
      return FALSE;
    }
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    if (self->video_format != GST_DECKLINK_VIDEO_FORMAT_AUTO &&
        gst_decklink_pixel_format_from_type (self->video_format) != f) {
      GST_WARNING_OBJECT (self, "Failed to set pixel format to %d",
          self->video_format);
      return FALSE;
    }
597
  } else {
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    /* We don't have to give the format in EnableVideoOutput. Therefore,
     * even if it's AUTO, we have it stored in self->info and set it in
     * gst_decklink_video_sink_prepare */
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    mode = gst_decklink_get_mode (self->mode);
    g_assert (mode != NULL);
  };
604

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  /* enable or disable keyer */
  if (self->output->keyer != NULL) {
    if (self->keyer_mode == bmdKeyerModeOff) {
      self->output->keyer->Disable ();
    } else if (self->keyer_mode == bmdKeyerModeInternal) {
      self->output->keyer->Enable (false);
      self->output->keyer->SetLevel (self->keyer_level);
    } else if (self->keyer_mode == bmdKeyerModeExternal) {
      self->output->keyer->Enable (true);
      self->output->keyer->SetLevel (self->keyer_level);
    } else {
      g_assert_not_reached ();
    }
  } else if (self->keyer_mode != bmdKeyerModeOff) {
    GST_WARNING_OBJECT (self, "Failed to set keyer to mode %d",
        self->keyer_mode);
  }

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  /* The timecode_format itself is used when we embed the actual timecode data
   * into the frame. Now we only need to know which of the two standards the
   * timecode format will adhere to: VITC or RP188, and send the appropriate
   * flag to EnableVideoOutput. The exact format is specified later.
   *
   * Note that this flag will have no effect in practice if the video stream
   * does not contain timecode metadata.
   */
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  if ((gint64) self->timecode_format ==
      (gint64) GST_DECKLINK_TIMECODE_FORMAT_VITC
      || (gint64) self->timecode_format ==
      (gint64) GST_DECKLINK_TIMECODE_FORMAT_VITCFIELD2)
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    flags = bmdVideoOutputVITC;
  else
    flags = bmdVideoOutputRP188;

639
  if (self->caption_line > 0 || self->afd_bar_line > 0)
640
    flags = (BMDVideoOutputFlags) (flags | bmdVideoOutputVANC);
641

642
  ret = self->output->output->EnableVideoOutput (mode->mode, flags);
643
  if (ret != S_OK) {
644 645
    GST_WARNING_OBJECT (self, "Failed to enable video output: 0x%08lx",
        (unsigned long) ret);
646 647 648
    return FALSE;
  }

649
  self->info = info;
650 651
  g_mutex_lock (&self->output->lock);
  self->output->mode = mode;
652
  self->output->video_enabled = TRUE;
653 654
  if (self->output->start_scheduled_playback)
    self->output->start_scheduled_playback (self->output->videosink);
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  g_mutex_unlock (&self->output->lock);

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  if (self->vbiencoder) {
    gst_video_vbi_encoder_free (self->vbiencoder);
    self->vbiencoder = NULL;
    self->anc_vformat = GST_VIDEO_FORMAT_UNKNOWN;
  }

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  return TRUE;
}

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static GstCaps *
gst_decklink_video_sink_get_caps (GstBaseSink * bsink, GstCaps * filter)
{
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (bsink);
  GstCaps *mode_caps, *caps;

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  if (self->mode == GST_DECKLINK_MODE_AUTO
      && self->video_format == GST_DECKLINK_VIDEO_FORMAT_AUTO)
674
    mode_caps = gst_decklink_mode_get_template_caps (FALSE);
675
  else if (self->video_format == GST_DECKLINK_VIDEO_FORMAT_AUTO)
676
    mode_caps = gst_decklink_mode_get_caps_all_formats (self->mode, FALSE);
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  else if (self->mode == GST_DECKLINK_MODE_AUTO)
    mode_caps =
        gst_decklink_pixel_format_get_caps (gst_decklink_pixel_format_from_type
680
        (self->video_format), FALSE);
681
  else
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    mode_caps =
        gst_decklink_mode_get_caps (self->mode,
684
        gst_decklink_pixel_format_from_type (self->video_format), FALSE);
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  mode_caps = gst_caps_make_writable (mode_caps);
  /* For output we support any framerate and only really care about timestamps */
  gst_caps_map_in_place (mode_caps, reset_framerate, NULL);

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  if (filter) {
    caps =
        gst_caps_intersect_full (filter, mode_caps, GST_CAPS_INTERSECT_FIRST);
    gst_caps_unref (mode_caps);
  } else {
    caps = mode_caps;
  }

  return caps;
}

static GstFlowReturn
gst_decklink_video_sink_render (GstBaseSink * bsink, GstBuffer * buffer)
{
  return GST_FLOW_OK;
}

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void
gst_decklink_video_sink_convert_to_internal_clock (GstDecklinkVideoSink * self,
708 709
    GstClockTime * timestamp, GstClockTime * duration)
{
710
  GstClock *clock;
711
  GstClockTime internal_base, external_base, internal_offset;
712 713 714 715

  g_assert (timestamp != NULL);

  clock = gst_element_get_clock (GST_ELEMENT_CAST (self));
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  GST_OBJECT_LOCK (self);
  internal_base = self->internal_base_time;
  external_base = self->external_base_time;
  internal_offset = self->internal_time_offset;
  GST_OBJECT_UNLOCK (self);

722
  if (!clock || clock != self->output->clock) {
723
    GstClockTime internal, external, rate_n, rate_d;
724 725 726
    GstClockTime external_timestamp = *timestamp;
    GstClockTime base_time;

727 728 729
    gst_clock_get_calibration (self->output->clock, &internal, &external,
        &rate_n, &rate_d);

730
    // Convert to the running time corresponding to both clock times
731
    if (!GST_CLOCK_TIME_IS_VALID (internal_base) || internal < internal_base)
732 733 734
      internal = 0;
    else
      internal -= internal_base;
735

736
    if (!GST_CLOCK_TIME_IS_VALID (external_base) || external < external_base)
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      external = 0;
    else
      external -= external_base;

    // Convert timestamp to the "running time" since we started scheduled
    // playback, that is the difference between the pipeline's base time
    // and our own base time.
    base_time = gst_element_get_base_time (GST_ELEMENT_CAST (self));
    if (base_time > external_base)
      base_time = 0;
    else
      base_time = external_base - base_time;
749

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    if (external_timestamp < base_time)
      external_timestamp = 0;
    else
      external_timestamp = external_timestamp - base_time;

    // Get the difference in the external time, note
    // that the running time is external time.
    // Then scale this difference and offset it to
    // our internal time. Now we have the running time
    // according to our internal clock.
    //
    // For the duration we just scale
    *timestamp =
        gst_clock_unadjust_with_calibration (NULL, external_timestamp,
        internal, external, rate_n, rate_d);

    GST_LOG_OBJECT (self,
        "Converted %" GST_TIME_FORMAT " to %" GST_TIME_FORMAT " (internal: %"
        GST_TIME_FORMAT " external %" GST_TIME_FORMAT " rate: %lf)",
        GST_TIME_ARGS (external_timestamp), GST_TIME_ARGS (*timestamp),
        GST_TIME_ARGS (internal), GST_TIME_ARGS (external),
        ((gdouble) rate_n) / ((gdouble) rate_d));

    if (duration) {
      GstClockTime external_duration = *duration;

      *duration = gst_util_uint64_scale (external_duration, rate_d, rate_n);
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      GST_LOG_OBJECT (self,
779 780 781 782 783
          "Converted duration %" GST_TIME_FORMAT " to %" GST_TIME_FORMAT
          " (internal: %" GST_TIME_FORMAT " external %" GST_TIME_FORMAT
          " rate: %lf)", GST_TIME_ARGS (external_duration),
          GST_TIME_ARGS (*duration), GST_TIME_ARGS (internal),
          GST_TIME_ARGS (external), ((gdouble) rate_n) / ((gdouble) rate_d));
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    }
  } else {
786 787
    GST_LOG_OBJECT (self, "No clock conversion needed, same clocks: %"
        GST_TIME_FORMAT, GST_TIME_ARGS (*timestamp));
788
  }
789

790
  if (external_base != GST_CLOCK_TIME_NONE &&
791
      internal_base != GST_CLOCK_TIME_NONE)
792 793 794
    *timestamp += internal_offset;
  else
    *timestamp = gst_clock_get_internal_time (self->output->clock);
795 796

  GST_LOG_OBJECT (self, "Output timestamp %" GST_TIME_FORMAT
797 798
      " using clock epoch %" GST_TIME_FORMAT,
      GST_TIME_ARGS (*timestamp), GST_TIME_ARGS (self->output->clock_epoch));
799 800 801

  if (clock)
    gst_object_unref (clock);
802 803
}

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/* Copied from ext/closedcaption/gstccconverter.c */
/* Converts raw CEA708 cc_data and an optional timecode into CDP */
static guint
convert_cea708_cc_data_cea708_cdp_internal (GstDecklinkVideoSink * self,
    const guint8 * cc_data, guint cc_data_len, guint8 * cdp, guint cdp_len,
    const GstVideoTimeCodeMeta * tc_meta)
{
  GstByteWriter bw;
  guint8 flags, checksum;
  guint i, len;
  const GstDecklinkMode *mode = gst_decklink_get_mode (self->mode);

  gst_byte_writer_init_with_data (&bw, cdp, cdp_len, FALSE);
  gst_byte_writer_put_uint16_be_unchecked (&bw, 0x9669);
  /* Write a length of 0 for now */
  gst_byte_writer_put_uint8_unchecked (&bw, 0);
  if (mode->fps_n == 24000 && mode->fps_d == 1001) {
    gst_byte_writer_put_uint8_unchecked (&bw, 0x1f);
  } else if (mode->fps_n == 24 && mode->fps_d == 1) {
    gst_byte_writer_put_uint8_unchecked (&bw, 0x2f);
  } else if (mode->fps_n == 25 && mode->fps_d == 1) {
    gst_byte_writer_put_uint8_unchecked (&bw, 0x3f);
  } else if (mode->fps_n == 30 && mode->fps_d == 1001) {
    gst_byte_writer_put_uint8_unchecked (&bw, 0x4f);
  } else if (mode->fps_n == 30 && mode->fps_d == 1) {
    gst_byte_writer_put_uint8_unchecked (&bw, 0x5f);
  } else if (mode->fps_n == 50 && mode->fps_d == 1) {
    gst_byte_writer_put_uint8_unchecked (&bw, 0x6f);
  } else if (mode->fps_n == 60000 && mode->fps_d == 1001) {
    gst_byte_writer_put_uint8_unchecked (&bw, 0x7f);
  } else if (mode->fps_n == 60 && mode->fps_d == 1) {
    gst_byte_writer_put_uint8_unchecked (&bw, 0x8f);
  } else {
    g_assert_not_reached ();
  }

  /* ccdata_present | caption_service_active */
  flags = 0x42;

  /* time_code_present */
  if (tc_meta)
    flags |= 0x80;

  /* reserved */
  flags |= 0x01;

  gst_byte_writer_put_uint8_unchecked (&bw, flags);

  gst_byte_writer_put_uint16_be_unchecked (&bw, self->cdp_hdr_sequence_cntr);

  if (tc_meta) {
    const GstVideoTimeCode *tc = &tc_meta->tc;

    gst_byte_writer_put_uint8_unchecked (&bw, 0x71);
    gst_byte_writer_put_uint8_unchecked (&bw, 0xc0 |
        (((tc->hours % 10) & 0x3) << 4) |
        ((tc->hours - (tc->hours % 10)) & 0xf));

    gst_byte_writer_put_uint8_unchecked (&bw, 0x80 |
        (((tc->minutes % 10) & 0x7) << 4) |
        ((tc->minutes - (tc->minutes % 10)) & 0xf));

    gst_byte_writer_put_uint8_unchecked (&bw,
        (tc->field_count <
            2 ? 0x00 : 0x80) | (((tc->seconds %
                    10) & 0x7) << 4) | ((tc->seconds -
                (tc->seconds % 10)) & 0xf));

    gst_byte_writer_put_uint8_unchecked (&bw,
        ((tc->config.flags & GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME) ? 0x80 :
            0x00) | (((tc->frames % 10) & 0x3) << 4) | ((tc->frames -
                (tc->frames % 10)) & 0xf));
  }

  gst_byte_writer_put_uint8_unchecked (&bw, 0x72);
  gst_byte_writer_put_uint8_unchecked (&bw, 0xe0 | cc_data_len / 3);
  gst_byte_writer_put_data_unchecked (&bw, cc_data, cc_data_len);

  gst_byte_writer_put_uint8_unchecked (&bw, 0x74);
  gst_byte_writer_put_uint16_be_unchecked (&bw, self->cdp_hdr_sequence_cntr);
  self->cdp_hdr_sequence_cntr++;
  /* We calculate the checksum afterwards */
  gst_byte_writer_put_uint8_unchecked (&bw, 0);

  len = gst_byte_writer_get_pos (&bw);
  gst_byte_writer_set_pos (&bw, 2);
  gst_byte_writer_put_uint8_unchecked (&bw, len);

  checksum = 0;
  for (i = 0; i < len; i++) {
    checksum += cdp[i];
  }
  checksum &= 0xff;
  checksum = 256 - checksum;
  cdp[len - 1] = checksum;

  return len;
}

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static void
write_vbi (GstDecklinkVideoSink * self, GstBuffer * buffer,
    BMDPixelFormat format, IDeckLinkMutableVideoFrame * frame,
    GstVideoTimeCodeMeta * tc_meta)
{
  IDeckLinkVideoFrameAncillary *vanc_frame = NULL;
  gpointer iter = NULL;
  GstVideoCaptionMeta *cc_meta;
  guint8 *vancdata;
  gboolean got_captions = FALSE;

  if (self->caption_line == 0 && self->afd_bar_line == 0)
    return;

  if (self->vbiencoder == NULL) {
    self->vbiencoder =
        gst_video_vbi_encoder_new (self->info.finfo->format, self->info.width);
    self->anc_vformat = self->info.finfo->format;
  }

  /* Put any closed captions into the configured line */
  while ((cc_meta =
          (GstVideoCaptionMeta *) gst_buffer_iterate_meta_filtered (buffer,
              &iter, GST_VIDEO_CAPTION_META_API_TYPE))) {
    switch (cc_meta->caption_type) {
      case GST_VIDEO_CAPTION_TYPE_CEA608_RAW:{
        guint8 data[138];
        guint i, n;

        n = cc_meta->size / 2;
        if (cc_meta->size > 46) {
          GST_WARNING_OBJECT (self, "Too big raw CEA608 buffer");
          break;
        }

        /* This is the offset from line 9 for 525-line fields and from line
         * 5 for 625-line fields.
         *
         * The highest bit is set for field 1 but not for field 0, but we
         * have no way of knowning the field here
         */
        for (i = 0; i < n; i++) {
          data[3 * i] = 0x80 | (self->info.height ==
              525 ? self->caption_line - 9 : self->caption_line - 5);
          data[3 * i + 1] = cc_meta->data[2 * i];
          data[3 * i + 2] = cc_meta->data[2 * i + 1];
        }

        if (!gst_video_vbi_encoder_add_ancillary (self->vbiencoder,
                FALSE,
                GST_VIDEO_ANCILLARY_DID16_S334_EIA_608 >> 8,
                GST_VIDEO_ANCILLARY_DID16_S334_EIA_608 & 0xff, data, 3))
          GST_WARNING_OBJECT (self, "Couldn't add meta to ancillary data");

        got_captions = TRUE;

        break;
      }
      case GST_VIDEO_CAPTION_TYPE_CEA608_S334_1A:{
        if (!gst_video_vbi_encoder_add_ancillary (self->vbiencoder,
                FALSE,
                GST_VIDEO_ANCILLARY_DID16_S334_EIA_608 >> 8,
                GST_VIDEO_ANCILLARY_DID16_S334_EIA_608 & 0xff, cc_meta->data,
                cc_meta->size))
          GST_WARNING_OBJECT (self, "Couldn't add meta to ancillary data");

        got_captions = TRUE;

        break;
      }
      case GST_VIDEO_CAPTION_TYPE_CEA708_RAW:{
        guint8 data[256];
        guint n;

        n = cc_meta->size / 3;
        if (cc_meta->size > 46) {
          GST_WARNING_OBJECT (self, "Too big raw CEA708 buffer");
          break;
        }

        n = convert_cea708_cc_data_cea708_cdp_internal (self, cc_meta->data,
            cc_meta->size, data, sizeof (data), tc_meta);
        if (!gst_video_vbi_encoder_add_ancillary (self->vbiencoder, FALSE,
                GST_VIDEO_ANCILLARY_DID16_S334_EIA_708 >> 8,
                GST_VIDEO_ANCILLARY_DID16_S334_EIA_708 & 0xff, data, n))
          GST_WARNING_OBJECT (self, "Couldn't add meta to ancillary data");

        got_captions = TRUE;

        break;
      }
      case GST_VIDEO_CAPTION_TYPE_CEA708_CDP:{
        if (!gst_video_vbi_encoder_add_ancillary (self->vbiencoder,
                FALSE,
                GST_VIDEO_ANCILLARY_DID16_S334_EIA_708 >> 8,
                GST_VIDEO_ANCILLARY_DID16_S334_EIA_708 & 0xff, cc_meta->data,
                cc_meta->size))
          GST_WARNING_OBJECT (self, "Couldn't add meta to ancillary data");

        got_captions = TRUE;

        break;
      }
      default:{
        GST_FIXME_OBJECT (self, "Caption type %d not supported",
            cc_meta->caption_type);
        break;
      }
    }
  }

  if ((got_captions || self->afd_bar_line != 0)
      && self->output->output->CreateAncillaryData (format,
          &vanc_frame) == S_OK) {
    GstVideoAFDMeta *afd_meta = NULL, *afd_meta2 = NULL;
    GstVideoBarMeta *bar_meta = NULL, *bar_meta2 = NULL;
    GstMeta *meta;
    gpointer meta_iter;
    guint8 afd_bar_data[8] = { 0, };
    guint8 afd_bar_data2[8] = { 0, };
    guint8 afd = 0;
    gboolean is_letterbox = 0;
    guint16 bar1 = 0, bar2 = 0;
    guint i;

    // Get any reasonable AFD/Bar metas for both fields
    meta_iter = NULL;
    while ((meta =
            gst_buffer_iterate_meta_filtered (buffer, &meta_iter,
                GST_VIDEO_AFD_META_API_TYPE))) {
      GstVideoAFDMeta *tmp_meta = (GstVideoAFDMeta *) meta;

      if (tmp_meta->field == 0 || !afd_meta || (afd_meta && afd_meta->field != 0
              && tmp_meta->field == 0))
        afd_meta = tmp_meta;
      if (tmp_meta->field == 1 || !afd_meta2 || (afd_meta2
              && afd_meta->field != 1 && tmp_meta->field == 1))
        afd_meta2 = tmp_meta;
    }

    meta_iter = NULL;
    while ((meta =
            gst_buffer_iterate_meta_filtered (buffer, &meta_iter,
                GST_VIDEO_BAR_META_API_TYPE))) {
      GstVideoBarMeta *tmp_meta = (GstVideoBarMeta *) meta;

      if (tmp_meta->field == 0 || !bar_meta || (bar_meta && bar_meta->field != 0
              && tmp_meta->field == 0))
        bar_meta = tmp_meta;
      if (tmp_meta->field == 1 || !bar_meta2 || (bar_meta2
              && bar_meta->field != 1 && tmp_meta->field == 1))
        bar_meta2 = tmp_meta;
    }

    for (i = 0; i < 2; i++) {
      guint8 *afd_bar_data_ptr;

      if (i == 0) {
        afd_bar_data_ptr = afd_bar_data;
        afd = afd_meta ? afd_meta->afd : 0;
        is_letterbox = bar_meta ? bar_meta->is_letterbox : FALSE;
        bar1 = bar_meta ? bar_meta->bar_data1 : 0;
        bar2 = bar_meta ? bar_meta->bar_data2 : 0;
      } else {
        afd_bar_data_ptr = afd_bar_data2;
        afd = afd_meta2 ? afd_meta2->afd : 0;
        is_letterbox = bar_meta2 ? bar_meta2->is_letterbox : FALSE;
        bar1 = bar_meta2 ? bar_meta2->bar_data1 : 0;
        bar2 = bar_meta2 ? bar_meta2->bar_data2 : 0;
      }

      /* See SMPTE 2016-3 Section 4 */
      /* AFD and AR */
      if (self->mode < (gint) GST_DECKLINK_MODE_NTSC_WIDESCREEN) {
        afd_bar_data_ptr[0] = (afd << 3) | 0x0;
      } else {
        afd_bar_data_ptr[0] = (afd << 3) | 0x4;
      }

      /* Bar flags */
      afd_bar_data_ptr[3] = is_letterbox ? 0xc0 : 0x30;

      /* Bar value 1 and 2 */
      GST_WRITE_UINT16_BE (&afd_bar_data_ptr[4], bar1);
      GST_WRITE_UINT16_BE (&afd_bar_data_ptr[6], bar2);
    }

    /* AFD on the same line as the captions */
    if (self->caption_line == self->afd_bar_line) {
      if (!gst_video_vbi_encoder_add_ancillary (self->vbiencoder,
              FALSE, GST_VIDEO_ANCILLARY_DID16_S2016_3_AFD_BAR >> 8,
              GST_VIDEO_ANCILLARY_DID16_S2016_3_AFD_BAR & 0xff, afd_bar_data,
              sizeof (afd_bar_data)))
        GST_WARNING_OBJECT (self,
            "Couldn't add AFD/Bar data to ancillary data");
    }

    /* FIXME: Add captions to the correct field? Captions for the second
     * field should probably be inserted into the second field */

    if (got_captions || self->caption_line == self->afd_bar_line) {
      if (vanc_frame->GetBufferForVerticalBlankingLine (self->caption_line,
              (void **) &vancdata) == S_OK) {
        gst_video_vbi_encoder_write_line (self->vbiencoder, vancdata);
      } else {
        GST_WARNING_OBJECT (self,
            "Failed to get buffer for line %d ancillary data",
            self->caption_line);
      }
    }

    /* AFD on a different line than the captions */
    if (self->afd_bar_line != 0 && self->caption_line != self->afd_bar_line) {
      if (!gst_video_vbi_encoder_add_ancillary (self->vbiencoder,
              FALSE, GST_VIDEO_ANCILLARY_DID16_S2016_3_AFD_BAR >> 8,
              GST_VIDEO_ANCILLARY_DID16_S2016_3_AFD_BAR & 0xff, afd_bar_data,
              sizeof (afd_bar_data)))
        GST_WARNING_OBJECT (self,
            "Couldn't add AFD/Bar data to ancillary data");

      if (vanc_frame->GetBufferForVerticalBlankingLine (self->afd_bar_line,
              (void **) &vancdata) == S_OK) {
        gst_video_vbi_encoder_write_line (self->vbiencoder, vancdata);
      } else {
        GST_WARNING_OBJECT (self,
            "Failed to get buffer for line %d ancillary data",
            self->afd_bar_line);
      }
    }

    /* For interlaced video we need to also add AFD to the second field */
    if (GST_VIDEO_INFO_IS_INTERLACED (&self->info) && self->afd_bar_line != 0) {
      guint field2_offset;

      /* The VANC lines for the second field are at an offset, depending on
       * the format in use.
       */
      switch (self->info.height) {
        case 486:
          /* NTSC: 525 / 2 + 1 */
          field2_offset = 263;
          break;
        case 576:
          /* PAL: 625 / 2 + 1 */
          field2_offset = 313;
          break;
        case 1080:
          /* 1080i: 1125 / 2 + 1 */
          field2_offset = 563;
          break;
        default:
          g_assert_not_reached ();
      }

      if (!gst_video_vbi_encoder_add_ancillary (self->vbiencoder,
              FALSE, GST_VIDEO_ANCILLARY_DID16_S2016_3_AFD_BAR >> 8,
              GST_VIDEO_ANCILLARY_DID16_S2016_3_AFD_BAR & 0xff, afd_bar_data2,
              sizeof (afd_bar_data)))
        GST_WARNING_OBJECT (self,
            "Couldn't add AFD/Bar data to ancillary data");

      if (vanc_frame->GetBufferForVerticalBlankingLine (self->afd_bar_line +
              field2_offset, (void **) &vancdata) == S_OK) {
        gst_video_vbi_encoder_write_line (self->vbiencoder, vancdata);
      } else {
        GST_WARNING_OBJECT (self,
            "Failed to get buffer for line %d ancillary data",
            self->afd_bar_line);
      }
    }

    if (frame->SetAncillaryData (vanc_frame) != S_OK) {
      GST_WARNING_OBJECT (self, "Failed to set ancillary data");
    }

    vanc_frame->Release ();
  } else if (got_captions || self->afd_bar_line != 0) {
    GST_WARNING_OBJECT (self, "Failed to allocate ancillary data frame");
  }
}

1184 1185 1186 1187 1188 1189 1190 1191 1192
static GstFlowReturn
gst_decklink_video_sink_prepare (GstBaseSink * bsink, GstBuffer * buffer)
{
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (bsink);
  GstVideoFrame vframe;
  IDeckLinkMutableVideoFrame *frame;
  guint8 *outdata, *indata;
  GstFlowReturn flow_ret;
  HRESULT ret;
1193 1194
  GstClockTime timestamp, duration;
  GstClockTime running_time, running_time_duration;
1195 1196
  GstClockTime latency, render_delay;
  GstClockTimeDiff ts_offset;
1197
  gint i;
1198 1199
  GstDecklinkVideoFormat caps_format;
  BMDPixelFormat format;
1200
  gint stride;
1201
  GstVideoTimeCodeMeta *tc_meta;
1202 1203 1204 1205 1206 1207 1208 1209

  GST_DEBUG_OBJECT (self, "Preparing buffer %p", buffer);

  // FIXME: Handle no timestamps
  if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer)) {
    return GST_FLOW_ERROR;
  }

1210 1211 1212
  caps_format = gst_decklink_type_from_video_format (self->info.finfo->format);
  format = gst_decklink_pixel_format_from_type (caps_format);

1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226
  timestamp = GST_BUFFER_TIMESTAMP (buffer);
  duration = GST_BUFFER_DURATION (buffer);
  if (duration == GST_CLOCK_TIME_NONE) {
    duration =
        gst_util_uint64_scale_int (GST_SECOND, self->info.fps_d,
        self->info.fps_n);
  }
  running_time =
      gst_segment_to_running_time (&GST_BASE_SINK_CAST (self)->segment,
      GST_FORMAT_TIME, timestamp);
  running_time_duration =
      gst_segment_to_running_time (&GST_BASE_SINK_CAST (self)->segment,
      GST_FORMAT_TIME, timestamp + duration) - running_time;

1227 1228 1229 1230 1231 1232 1233 1234 1235
  /* See gst_base_sink_adjust_time() */
  latency = gst_base_sink_get_latency (bsink);
  render_delay = gst_base_sink_get_render_delay (bsink);
  ts_offset = gst_base_sink_get_ts_offset (bsink);

  running_time += latency;

  if (ts_offset < 0) {
    ts_offset = -ts_offset;
1236
    if ((GstClockTime) ts_offset < running_time)
1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248
      running_time -= ts_offset;
    else
      running_time = 0;
  } else {
    running_time += ts_offset;
  }

  if (running_time > render_delay)
    running_time -= render_delay;
  else
    running_time = 0;

1249
  ret = self->output->output->CreateVideoFrame (self->info.width,
1250 1251
      self->info.height, self->info.stride[0], format, bmdFrameFlagDefault,
      &frame);
1252 1253
  if (ret != S_OK) {
    GST_ELEMENT_ERROR (self, STREAM, FAILED,
1254
        (NULL), ("Failed to create video frame: 0x%08lx", (unsigned long) ret));
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265
    return GST_FLOW_ERROR;
  }

  if (!gst_video_frame_map (&vframe, &self->info, buffer, GST_MAP_READ)) {
    GST_ERROR_OBJECT (self, "Failed to map video frame");
    flow_ret = GST_FLOW_ERROR;
    goto out;
  }

  frame->GetBytes ((void **) &outdata);
  indata = (guint8 *) GST_VIDEO_FRAME_PLANE_DATA (&vframe, 0);
1266 1267
  stride =
      MIN (GST_VIDEO_FRAME_PLANE_STRIDE (&vframe, 0), frame->GetRowBytes ());
1268
  for (i = 0; i < self->info.height; i++) {
1269
    memcpy (outdata, indata, stride);
1270 1271 1272 1273 1274
    indata += GST_VIDEO_FRAME_PLANE_STRIDE (&vframe, 0);
    outdata += frame->GetRowBytes ();
  }
  gst_video_frame_unmap (&vframe);

1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294
  tc_meta = gst_buffer_get_video_time_code_meta (buffer);
  if (tc_meta) {
    BMDTimecodeFlags bflags = (BMDTimecodeFlags) 0;
    gchar *tc_str;

    if (((GstVideoTimeCodeFlags) (tc_meta->tc.
                config.flags)) & GST_VIDEO_TIME_CODE_FLAGS_DROP_FRAME)
      bflags = (BMDTimecodeFlags) (bflags | bmdTimecodeIsDropFrame);
    else
      bflags = (BMDTimecodeFlags) (bflags | bmdTimecodeFlagDefault);
    if (tc_meta->tc.field_count == 2)
      bflags = (BMDTimecodeFlags) (bflags | bmdTimecodeFieldMark);

    tc_str = gst_video_time_code_to_string (&tc_meta->tc);
    ret = frame->SetTimecodeFromComponents (self->timecode_format,
        (uint8_t) tc_meta->tc.hours,
        (uint8_t) tc_meta->tc.minutes,
        (uint8_t) tc_meta->tc.seconds, (uint8_t) tc_meta->tc.frames, bflags);
    if (ret != S_OK) {
      GST_ERROR_OBJECT (self,
1295 1296
          "Failed to set timecode %s to video frame: 0x%08lx", tc_str,
          (unsigned long) ret);
1297 1298 1299 1300 1301 1302 1303 1304
      flow_ret = GST_FLOW_ERROR;
      g_free (tc_str);
      goto out;
    }
    GST_DEBUG_OBJECT (self, "Set frame timecode to %s", tc_str);
    g_free (tc_str);
  }

1305
  write_vbi (self, buffer, format, frame, tc_meta);
1306 1307 1308

  gst_decklink_video_sink_convert_to_internal_clock (self, &running_time,
      &running_time_duration);
1309

1310 1311
  GST_LOG_OBJECT (self, "Scheduling video frame %p at %" GST_TIME_FORMAT
      " with duration %" GST_TIME_FORMAT, frame, GST_TIME_ARGS (running_time),
1312 1313 1314
      GST_TIME_ARGS (running_time_duration));

  ret = self->output->output->ScheduleVideoFrame (frame,
1315
      running_time, running_time_duration, GST_SECOND);
1316 1317
  if (ret != S_OK) {
    GST_ELEMENT_ERROR (self, STREAM, FAILED,
1318
        (NULL), ("Failed to schedule frame: 0x%08lx", (unsigned long) ret));
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337
    flow_ret = GST_FLOW_ERROR;
    goto out;
  }

  flow_ret = GST_FLOW_OK;

out:

  frame->Release ();

  return flow_ret;
}

static gboolean
gst_decklink_video_sink_open (GstBaseSink * bsink)
{
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (bsink);
  const GstDecklinkMode *mode;

1338
  GST_DEBUG_OBJECT (self, "Starting");
1339 1340 1341 1342 1343 1344 1345 1346 1347

  self->output =
      gst_decklink_acquire_nth_output (self->device_number,
      GST_ELEMENT_CAST (self), FALSE);
  if (!self->output) {
    GST_ERROR_OBJECT (self, "Failed to acquire output");
    return FALSE;
  }

1348 1349
  g_object_notify (G_OBJECT (self), "hw-serial-number");

1350 1351 1352
  mode = gst_decklink_get_mode (self->mode);
  g_assert (mode != NULL);

1353 1354
  g_mutex_lock (&self->output->lock);
  self->output->mode = mode;
1355 1356
  self->output->start_scheduled_playback =
      gst_decklink_video_sink_start_scheduled_playback;
1357
  self->output->clock_start_time = GST_CLOCK_TIME_NONE;
1358
  self->output->clock_epoch += self->output->clock_last_time;
1359 1360
  self->output->clock_last_time = 0;
  self->output->clock_offset = 0;
1361 1362 1363 1364
  GST_OBJECT_LOCK (self);
  self->internal_base_time = GST_CLOCK_TIME_NONE;
  self->external_base_time = GST_CLOCK_TIME_NONE;
  GST_OBJECT_UNLOCK (self);
1365 1366
  g_mutex_unlock (&self->output->lock);

1367 1368 1369 1370 1371 1372 1373 1374
  return TRUE;
}

static gboolean
gst_decklink_video_sink_close (GstBaseSink * bsink)
{
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (bsink);

1375
  GST_DEBUG_OBJECT (self, "Closing");
1376 1377

  if (self->output) {
1378 1379
    g_mutex_lock (&self->output->lock);
    self->output->mode = NULL;
1380
    self->output->video_enabled = FALSE;
1381
    if (self->output->start_scheduled_playback && self->output->videosink)
1382
      self->output->start_scheduled_playback (self->output->videosink);
1383 1384
    g_mutex_unlock (&self->output->lock);

1385 1386 1387 1388 1389 1390 1391 1392 1393
    self->output->output->DisableVideoOutput ();
    gst_decklink_release_nth_output (self->device_number,
        GST_ELEMENT_CAST (self), FALSE);
    self->output = NULL;
  }

  return TRUE;
}

1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
static gboolean
gst_decklink_video_sink_stop (GstDecklinkVideoSink * self)
{
  GST_DEBUG_OBJECT (self, "Stopping");

  if (self->output && self->output->video_enabled) {
    g_mutex_lock (&self->output->lock);
    self->output->video_enabled = FALSE;
    g_mutex_unlock (&self->output->lock);

    self->output->output->DisableVideoOutput ();
    self->output->output->SetScheduledFrameCompletionCallback (NULL);
  }

1408 1409 1410 1411 1412 1413
  if (self->vbiencoder) {
    gst_video_vbi_encoder_free (self->vbiencoder);
    self->vbiencoder = NULL;
    self->anc_vformat = GST_VIDEO_FORMAT_UNKNOWN;
  }

1414 1415 1416
  return TRUE;
}

1417
static void
1418
_wait_for_stop_notify (GstDecklinkVideoSink * self)
1419 1420 1421 1422 1423 1424 1425
{
  bool active = false;

  self->output->output->IsScheduledPlaybackRunning (&active);
  while (active) {
    /* cause sometimes decklink stops without notifying us... */
    guint64 wait_time = g_get_monotonic_time () + G_TIME_SPAN_SECOND;
1426 1427
    if (!g_cond_wait_until (&self->output->cond, &self->output->lock,
            wait_time))
1428 1429 1430 1431 1432
      GST_WARNING_OBJECT (self, "Failed to wait for stop notification");
    self->output->output->IsScheduledPlaybackRunning (&active);
  }
}

1433 1434 1435 1436 1437 1438 1439 1440
static void
gst_decklink_video_sink_start_scheduled_playback (GstElement * element)
{
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (element);
  GstClockTime start_time;
  HRESULT res;
  bool active;

1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453
  // Check if we're already started
  if (self->output->started) {
    GST_DEBUG_OBJECT (self, "Already started");
    return;
  }
  // Check if we're ready to start:
  // we need video and audio enabled, if there is audio
  // and both of the two elements need to be set to PLAYING already
  if (!self->output->video_enabled) {
    GST_DEBUG_OBJECT (self,
        "Not starting scheduled playback yet: video not enabled yet!");
    return;
  }
1454

1455 1456 1457 1458 1459 1460
  if (self->output->audiosink && !self->output->audio_enabled) {
    GST_DEBUG_OBJECT (self,
        "Not starting scheduled playback yet: "
        "have audio but not enabled yet!");
    return;
  }
1461

1462 1463
  if ((GST_STATE (self) < GST_STATE_PAUSED
          && GST_STATE_PENDING (self) < GST_STATE_PAUSED)
1464
      || (self->output->audiosink &&
1465
          GST_STATE (self->output->audiosink) < GST_STATE_PAUSED
1466
          && GST_STATE_PENDING (self->output->audiosink) < GST_STATE_PAUSED)) {
1467 1468
    GST_DEBUG_OBJECT (self,
        "Not starting scheduled playback yet: "
1469
        "Elements are not set to PAUSED yet");
1470 1471 1472 1473
    return;
  }
  // Need to unlock to get the clock time
  g_mutex_unlock (&self->output->lock);
1474

1475
  start_time = gst_clock_get_internal_time (self->output->clock);
1476

1477 1478 1479 1480 1481
  g_mutex_lock (&self->output->lock);
  // Check if someone else started in the meantime
  if (self->output->started) {
    return;
  }
1482

1483 1484 1485 1486
  active = false;
  self->output->output->IsScheduledPlaybackRunning (&active);
  if (active) {
    GST_DEBUG_OBJECT (self, "Stopping scheduled playback");
1487

1488
    self->output->started = FALSE;
1489

1490
    res = self->output->output->StopScheduledPlayback (0, 0, 0);
1491 1492
    if (res != S_OK) {
      GST_ELEMENT_ERROR (self, STREAM, FAILED,
1493
          (NULL), ("Failed to stop scheduled playback: 0x%08lx",
1494
              (unsigned long) res));
1495
      return;
1496
    }
1497
    // Wait until scheduled playback actually stopped
1498
    _wait_for_stop_notify (self);
1499
  }
1500

1501 1502 1503
  GST_DEBUG_OBJECT (self,
      "Starting scheduled playback at %" GST_TIME_FORMAT,
      GST_TIME_ARGS (start_time));
1504

1505 1506 1507 1508 1509 1510 1511 1512
  res =
      self->output->output->StartScheduledPlayback (start_time,
      GST_SECOND, 1.0);
  if (res != S_OK) {
    GST_ELEMENT_ERROR (self, STREAM, FAILED,
        (NULL), ("Failed to start scheduled playback: 0x%08lx",
            (unsigned long) res));
    return;
1513
  }
1514 1515

  self->output->started = TRUE;
1516 1517
}

1518 1519 1520 1521 1522 1523 1524 1525 1526 1527
static GstStateChangeReturn
gst_decklink_video_sink_stop_scheduled_playback (GstDecklinkVideoSink * self)
{
  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
  GstClockTime start_time;
  HRESULT res;

  if (!self->output->started)
    return ret;

1528
  start_time = gst_clock_get_internal_time (self->output->clock);
1529 1530 1531 1532 1533 1534 1535 1536 1537 1538

  GST_DEBUG_OBJECT (self,
      "Stopping scheduled playback at %" GST_TIME_FORMAT,
      GST_TIME_ARGS (start_time));

  g_mutex_lock (&self->output->lock);
  self->output->started = FALSE;
  res = self->output->output->StopScheduledPlayback (start_time, 0, GST_SECOND);
  if (res != S_OK) {
    GST_ELEMENT_ERROR (self, STREAM, FAILED,
1539
        (NULL), ("Failed to stop scheduled playback: 0x%08lx", (unsigned long)
1540
            res));
1541
    ret = GST_STATE_CHANGE_FAILURE;
1542 1543 1544
  } else {

    // Wait until scheduled playback actually stopped
1545
    _wait_for_stop_notify (self);
1546
  }
1547 1548
  g_mutex_unlock (&self->output->lock);
  GST_OBJECT_LOCK (self);
1549 1550
  self->internal_base_time = GST_CLOCK_TIME_NONE;
  self->external_base_time = GST_CLOCK_TIME_NONE;
1551
  GST_OBJECT_UNLOCK (self);
1552 1553 1554 1555

  return ret;
}

1556 1557 1558 1559 1560
static GstStateChangeReturn
gst_decklink_video_sink_change_state (GstElement * element,
    GstStateChange transition)
{
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (element);
1561
  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
1562

1563 1564 1565 1566
  GST_DEBUG_OBJECT (self, "changing state: %s => %s",
      gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
      gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));

1567 1568
  switch (transition) {
    case GST_STATE_CHANGE_READY_TO_PAUSED:
1569 1570
      self->vbiencoder = NULL;
      self->anc_vformat = GST_VIDEO_FORMAT_UNKNOWN;
1571
      self->cdp_hdr_sequence_cntr = 0;
1572

1573
      g_mutex_lock (&self->output->lock);
1574
      self->output->clock_epoch += self->output->clock_last_time;
1575 1576 1577
      self->output->clock_last_time = 0;
      self->output->clock_offset = 0;
      g_mutex_unlock (&self->output->lock);
1578 1579 1580
      gst_element_post_message (element,
          gst_message_new_clock_provide (GST_OBJECT_CAST (element),
              self->output->clock, TRUE));
1581 1582 1583 1584
      g_mutex_lock (&self->output->lock);
      if (self->output->start_scheduled_playback)
        self->output->start_scheduled_playback (self->output->videosink);
      g_mutex_unlock (&self->output->lock);
1585 1586
      break;
    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:{
1587
      GstClock *clock;
1588 1589

      clock = gst_element_get_clock (GST_ELEMENT_CAST (self));
1590
      if (clock) {
1591
        if (clock != self->output->clock) {
1592 1593
          gst_clock_set_master (self->output->clock, clock);
        }
1594 1595

        GST_OBJECT_LOCK (self);
1596 1597
        if (self->external_base_time == GST_CLOCK_TIME_NONE
            || self->internal_base_time == GST_CLOCK_TIME_NONE) {
1598
          self->external_base_time = gst_clock_get_internal_time (clock);
1599 1600
          self->internal_base_time =
              gst_clock_get_internal_time (self->output->clock);
1601 1602
          self->internal_time_offset = self->internal_base_time;
        }
1603 1604 1605

        GST_INFO_OBJECT (self, "clock has been set to %" GST_PTR_FORMAT
            ", updated base times - internal: %" GST_TIME_FORMAT
1606 1607
            " external: %" GST_TIME_FORMAT " internal offset %"
            GST_TIME_FORMAT, clock,
1608
            GST_TIME_ARGS (self->internal_base_time),
1609 1610 1611
            GST_TIME_ARGS (self->external_base_time),
            GST_TIME_ARGS (self->internal_time_offset));
        GST_OBJECT_UNLOCK (self);
1612

1613
        gst_object_unref (clock);
1614 1615 1616 1617 1618
      } else {
        GST_ELEMENT_ERROR (self, STREAM, FAILED,
            (NULL), ("Need a clock to go to PLAYING"));
        ret = GST_STATE_CHANGE_FAILURE;
      }
1619 1620
      break;
    }
1621 1622 1623 1624 1625
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      if (gst_decklink_video_sink_stop_scheduled_playback (self) ==
          GST_STATE_CHANGE_FAILURE)
        ret = GST_STATE_CHANGE_FAILURE;
      break;
1626 1627
    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
      break;
1628 1629 1630 1631
    default:
      break;
  }

1632 1633
  if (ret == GST_STATE_CHANGE_FAILURE)
    return ret;
1634 1635 1636 1637 1638
  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
  if (ret == GST_STATE_CHANGE_FAILURE)
    return ret;

  switch (transition) {
1639
    case GST_STATE_CHANGE_PAUSED_TO_READY:{
1640 1641 1642 1643
      gst_element_post_message (element,
          gst_message_new_clock_lost (GST_OBJECT_CAST (element),
              self->output->clock));
      gst_clock_set_master (self->output->clock, NULL);
1644 1645
      // Reset calibration to make the clock reusable next time we use it
      gst_clock_set_calibration (self->output->clock, 0, 0, 1, 1);
1646
      g_mutex_lock (&self->output->lock);
1647
      self->output->clock_epoch += self->output->clock_last_time;
1648 1649 1650
      self->output->clock_last_time = 0;
      self->output->clock_offset = 0;
      g_mutex_unlock (&self->output->lock);
1651
      gst_decklink_video_sink_stop (self);
1652 1653 1654 1655
      GST_OBJECT_LOCK (self);
      self->internal_base_time = GST_CLOCK_TIME_NONE;
      self->external_base_time = GST_CLOCK_TIME_NONE;
      GST_OBJECT_UNLOCK (self);
1656 1657
      break;
    }
1658
    case GST_STATE_CHANGE_READY_TO_PAUSED:{
1659 1660
      break;
    }
1661 1662 1663 1664
    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
      break;
    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
      break;
1665 1666 1667 1668 1669 1670 1671
    default:
      break;
  }

  return ret;
}

1672 1673
static gboolean
gst_decklink_video_sink_event (GstBaseSink * bsink, GstEvent * event)
1674
{
1675
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (bsink);
1676

1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694
  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_FLUSH_START:
    {
      break;
    }
    case GST_EVENT_FLUSH_STOP:
    {
      gboolean reset_time;

      gst_event_parse_flush_stop (event, &reset_time);
      if (reset_time) {
        GST_OBJECT_LOCK (self);
        /* force a recalculation of clock base times */
        self->external_base_time = GST_CLOCK_TIME_NONE;
        self->internal_base_time = GST_CLOCK_TIME_NONE;
        GST_OBJECT_UNLOCK (self);
      }
      break;
1695
    }
1696 1697
    default:
      break;
1698
  }
1699 1700

  return GST_BASE_SINK_CLASS (parent_class)->event (bsink, event);
1701 1702
}

1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768
static GstClock *
gst_decklink_video_sink_provide_clock (GstElement * element)
{
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (element);

  if (!self->output)
    return NULL;

  return GST_CLOCK_CAST (gst_object_ref (self->output->clock));
}

static gboolean
gst_decklink_video_sink_propose_allocation (GstBaseSink * bsink,
    GstQuery * query)
{
  GstCaps *caps;
  GstVideoInfo info;
  GstBufferPool *pool;
  guint size;

  gst_query_parse_allocation (query, &caps, NULL);

  if (caps == NULL)
    return FALSE;

  if (!gst_video_info_from_caps (&info, caps))
    return FALSE;

  size = GST_VIDEO_INFO_SIZE (&info);

  if (gst_query_get_n_allocation_pools (query) == 0) {
    GstStructure *structure;
    GstAllocator *allocator = NULL;
    GstAllocationParams params = { (GstMemoryFlags) 0, 15, 0, 0 };

    if (gst_query_get_n_allocation_params (query) > 0)
      gst_query_parse_nth_allocation_param (query, 0, &allocator, &params);
    else
      gst_query_add_allocation_param (query, allocator, &params);

    pool = gst_video_buffer_pool_new ();

    structure = gst_buffer_pool_get_config (pool);
    gst_buffer_pool_config_set_params (structure, caps, size, 0, 0);
    gst_buffer_pool_config_set_allocator (structure, allocator, &params);

    if (allocator)
      gst_object_unref (allocator);

    if (!gst_buffer_pool_set_config (pool, structure))
      goto config_failed;

    gst_query_add_allocation_pool (query, pool, size, 0, 0);
    gst_object_unref (pool);
    gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL);
  }

  return TRUE;
  // ERRORS
config_failed:
  {
    GST_ERROR_OBJECT (bsink, "failed to set config");
    gst_object_unref (pool);
    return FALSE;
  }
}