C++ (Cpp) gst_structure_fixate_field Examples

Example #1

File: gstv4l2src.c Project: Lachann/gst-plugins-good

/* this function is a bit of a last resort */
static GstCaps *
gst_v4l2src_fixate (GstBaseSrc * basesrc, GstCaps * caps)
{
  GstStructure *structure;
  gint i;

  GST_DEBUG_OBJECT (basesrc, "fixating caps %" GST_PTR_FORMAT, caps);

  caps = gst_caps_make_writable (caps);

  for (i = 0; i < gst_caps_get_size (caps); ++i) {
    structure = gst_caps_get_structure (caps, i);

    /* We are fixating to a reasonable 320x200 resolution
       and the maximum framerate resolution for that size */
    if (gst_structure_has_field (structure, "width"))
      gst_structure_fixate_field_nearest_int (structure, "width", 320);

    if (gst_structure_has_field (structure, "height"))
      gst_structure_fixate_field_nearest_int (structure, "height", 200);

    if (gst_structure_has_field (structure, "framerate"))
      gst_structure_fixate_field_nearest_fraction (structure, "framerate",
          G_MAXINT, 1);

    if (gst_structure_has_field (structure, "format"))
      gst_structure_fixate_field (structure, "format");
  }

  GST_DEBUG_OBJECT (basesrc, "fixated caps %" GST_PTR_FORMAT, caps);

  caps = GST_BASE_SRC_CLASS (parent_class)->fixate (basesrc, caps);

  return caps;
}

Example #2

File: gstrpicamsrc.c Project: philn/gst-rpicamsrc

static GstCaps *
gst_rpi_cam_src_fixate (GstBaseSrc * basesrc, GstCaps * caps)
{
  GstStructure *structure;
  gint i;
  GST_DEBUG_OBJECT (basesrc, "fixating caps %" GST_PTR_FORMAT, caps);
  caps = gst_caps_make_writable (caps);
  for (i = 0; i < gst_caps_get_size (caps); ++i) {
    structure = gst_caps_get_structure (caps, i);
    /* Fixate to 1920x1080 resolution if possible */
    gst_structure_fixate_field_nearest_int (structure, "width", 1920);
    gst_structure_fixate_field_nearest_int (structure, "height", 1080);
    gst_structure_fixate_field_nearest_fraction (structure, "framerate", 30, 1);
    gst_structure_fixate_field (structure, "format");
  }

  GST_DEBUG_OBJECT (basesrc, "fixated caps %" GST_PTR_FORMAT, caps);
  caps = GST_BASE_SRC_CLASS (parent_class)->fixate (basesrc, caps);
  return caps;
}