tools/element-templates/videofilter

/* vim: set filetype=c: */
% ClassName
GstVideoFilter
% TYPE_CLASS_NAME
GST_TYPE_VIDEO_FILTER
% pads
sinkpad-template-video srcpad-template-video
% pkg-config
gstreamer-video-0.10
% includes
#include <gst/video/video.h>
#include <gst/video/gstvideofilter.h>
% prototypes
static gboolean
gst_replace_start (GstBaseTransform * trans);
static gboolean
gst_replace_stop (GstBaseTransform * trans);
static GstFlowReturn
gst_replace_transform_ip (GstBaseTransform * trans, GstBuffer * buf);
static gboolean
gst_replace_set_caps (GstBaseTransform * trans, GstCaps * incaps,
  GstCaps * outcaps);
% declare-class
  GstBaseTransformClass *base_transform_class = GST_BASE_TRANSFORM_CLASS (klass);
% set-methods
  base_transform_class->start = GST_DEBUG_FUNCPTR (gst_replace_start);
  base_transform_class->stop = GST_DEBUG_FUNCPTR (gst_replace_stop);
  base_transform_class->set_caps = GST_DEBUG_FUNCPTR (gst_replace_set_caps);
  base_transform_class->transform_ip = GST_DEBUG_FUNCPTR (gst_replace_transform_ip);
% methods

static gboolean
gst_replace_start (GstBaseTransform * trans)
{
  /* GstReplace *replace = GST_REPLACE (trans); */

  /* initialize processing */
  return TRUE;
}

static gboolean
gst_replace_stop (GstBaseTransform * trans)
{
  /* GstReplace *replace = GST_REPLACE (trans); */

  /* finalize processing */
  return TRUE;
}

static gboolean
gst_replace_set_caps (GstBaseTransform * trans, GstCaps * incaps,
  GstCaps * outcaps)
{
  /* GstReplace *replace = GST_REPLACE (trans); */
  GstVideoFormat video_format;
  int w, h;

  /* parse input caps, output caps are the same so we ignore them */
  if (!gst_video_format_parse_caps (incaps, &video_format, &w, &h))
    return FALSE;

  /* You'll need to add those fields to the instance struct first */
  /* replace->video_format = video_format; */
  /* replace->width = w; */
  /* replace->height = h; */
  return TRUE;
}

static GstFlowReturn
gst_replace_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
  /* GstReplace *replace = GST_REPLACE (trans); */

  /* process the video data in the buffer in-place */
  return GST_FLOW_OK;
}

% end