gstreamer/ext/pango/gsttimeoverlay.c

/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 * Copyright (C) <2003> 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/* portions derived from:
 * Pango
 * pangoft2topgm.c: Example program to view a UTF-8 encoding file
 *                  using Pango to render result.
 *
 * Copyright (C) 1999 Red Hat Software
 * Copyright (C) 2001 Sun Microsystems
 */


/*#define DEBUG_ENABLED */
#include <gsttimeoverlay.h>

#include <pango/pango.h>
#include <pango/pangoft2.h>

#include <math.h>



/* elementfactory information */
static GstElementDetails timeoverlay_details = {
  "Video Filter Template",
  "Filter/Video",
  "Template for a video filter",
  "David Schleef <ds@schleef.org>",
};

/* GstTimeoverlay signals and args */
enum {
  /* FILL ME */
  LAST_SIGNAL
};

enum {
  ARG_0,
  /* FILL ME */
};

static void     gst_timeoverlay_base_init       (gpointer g_class);
static void	gst_timeoverlay_class_init	(GstTimeoverlayClass *klass);
static void	gst_timeoverlay_init		(GstTimeoverlay *timeoverlay);

static void	gst_timeoverlay_set_property		(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void	gst_timeoverlay_get_property		(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);

static void gst_timeoverlay_planar411(GstVideofilter *videofilter, void *dest, void *src);
static void gst_timeoverlay_setup(GstVideofilter *videofilter);

static GstTimeoverlayClass *this_class = NULL;
static GstVideofilterClass *parent_class = NULL;
static GstElementClass *element_class = NULL;

GType
gst_timeoverlay_get_type (void)
{
  static GType timeoverlay_type = 0;

  if (!timeoverlay_type) {
    static const GTypeInfo timeoverlay_info = {
      sizeof(GstTimeoverlayClass),
      gst_timeoverlay_base_init,
      NULL,
      (GClassInitFunc)gst_timeoverlay_class_init,
      NULL,
      NULL,
      sizeof(GstTimeoverlay),
      0,
      (GInstanceInitFunc)gst_timeoverlay_init,
    };
    timeoverlay_type = g_type_register_static(GST_TYPE_VIDEOFILTER, "GstTimeoverlay", &timeoverlay_info, 0);
  }
  return timeoverlay_type;
}

static GstVideofilterFormat gst_timeoverlay_formats[] = {
  { "I420", 12, gst_timeoverlay_planar411, },
};

static GstCaps *gst_timeoverlay_get_capslist(void)
{
  GstVideofilterClass *klass;

  klass = g_type_class_ref(GST_TYPE_VIDEOFILTER);

  return gst_videofilter_class_get_capslist(klass);
}

static GstPadTemplate *
gst_timeoverlay_src_template_factory(void)
{
  static GstPadTemplate *templ = NULL;

  if(!templ){
    GstCaps *caps = GST_CAPS_NEW("src","video/x-raw-yuv",
		"width", GST_PROPS_INT_RANGE (1, G_MAXINT),
		"height", GST_PROPS_INT_RANGE (1, G_MAXINT),
		"framerate", GST_PROPS_FLOAT_RANGE (0, G_MAXFLOAT));

    caps = gst_caps_intersect(caps, gst_timeoverlay_get_capslist ());

    templ = GST_PAD_TEMPLATE_NEW("src", GST_PAD_SRC, GST_PAD_ALWAYS, caps);
  }
  return templ;
}

static GstPadTemplate *
gst_timeoverlay_sink_template_factory(void)
{
  static GstPadTemplate *templ = NULL;

  if(!templ){
    GstCaps *caps = GST_CAPS_NEW("sink","video/x-raw-yuv",
		"width", GST_PROPS_INT_RANGE (1, G_MAXINT),
		"height", GST_PROPS_INT_RANGE (1, G_MAXINT),
		"framerate", GST_PROPS_FLOAT_RANGE (0, G_MAXFLOAT));

    caps = gst_caps_intersect(caps, gst_timeoverlay_get_capslist ());

    templ = GST_PAD_TEMPLATE_NEW("src", GST_PAD_SINK, GST_PAD_ALWAYS, caps);
  }
  return templ;
}

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

  gst_element_class_add_pad_template (element_class, GST_PAD_TEMPLATE_GET (gst_timeoverlay_sink_template_factory));
  gst_element_class_add_pad_template (element_class, GST_PAD_TEMPLATE_GET (gst_timeoverlay_src_template_factory));
  gst_element_class_set_details (element_class, &timeoverlay_details);
}

static void
gst_timeoverlay_class_init (GstTimeoverlayClass *klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  GstVideofilterClass *gstvideofilter_class;
  int i;

  gobject_class = (GObjectClass*)klass;
  gstelement_class = (GstElementClass*)klass;
  gstvideofilter_class = (GstVideofilterClass *)klass;

#if 0
  g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_METHOD,
      g_param_spec_enum("method","method","method",
      GST_TYPE_TIMEOVERLAY_METHOD, GST_TIMEOVERLAY_METHOD_90R,
      G_PARAM_READWRITE));
#endif

  this_class = klass;
  parent_class = g_type_class_ref(GST_TYPE_VIDEOFILTER);
  element_class = g_type_class_ref(GST_TYPE_ELEMENT);

  gobject_class->set_property = gst_timeoverlay_set_property;
  gobject_class->get_property = gst_timeoverlay_get_property;

  gstvideofilter_class->setup = gst_timeoverlay_setup;

  for(i=0;i<G_N_ELEMENTS(gst_timeoverlay_formats);i++){
    gst_videofilter_class_add_format(gstvideofilter_class, gst_timeoverlay_formats + i);
  }
}

static void
gst_timeoverlay_init (GstTimeoverlay *timeoverlay)
{
  GstVideofilter *videofilter;

  GST_DEBUG("gst_timeoverlay_init");

  videofilter = GST_VIDEOFILTER(timeoverlay);

  videofilter->sinkpad = gst_pad_new_from_template (
		  GST_PAD_TEMPLATE_GET (gst_timeoverlay_sink_template_factory),
		  "sink");

  videofilter->srcpad = gst_pad_new_from_template (
		  GST_PAD_TEMPLATE_GET (gst_timeoverlay_src_template_factory),
		  "src");

  gst_videofilter_postinit(GST_VIDEOFILTER(timeoverlay));
}

static void
gst_timeoverlay_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
  GstTimeoverlay *src;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail(GST_IS_TIMEOVERLAY(object));
  src = GST_TIMEOVERLAY(object);

  GST_DEBUG("gst_timeoverlay_set_property");
  switch (prop_id) {
#if 0
    case ARG_METHOD:
      src->method = g_value_get_enum (value);
      break;
#endif
    default:
      break;
  }
}

static void
gst_timeoverlay_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
  GstTimeoverlay *src;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail(GST_IS_TIMEOVERLAY(object));
  src = GST_TIMEOVERLAY(object);

  switch (prop_id) {
#if 0
    case ARG_METHOD:
      g_value_set_enum (value, src->method);
      break;
#endif
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

static gboolean plugin_init (GstPlugin *plugin)
{
  if(!gst_library_load("gstvideofilter"))
    return FALSE;

  if (!gst_element_register (plugin, "timeoverlay", GST_RANK_NONE, GST_TYPE_TIMEOVERLAY))
    return FALSE;

  return TRUE;
}

GST_PLUGIN_DEFINE (
  GST_VERSION_MAJOR,
  GST_VERSION_MINOR,
  "timeoverlay",
  "Time overlay",
  plugin_init,
  VERSION,
  "LGPL",
  GST_COPYRIGHT,
  GST_PACKAGE,
  GST_ORIGIN)

static void gst_timeoverlay_setup(GstVideofilter *videofilter)
{
  GstTimeoverlay *timeoverlay;
  PangoFontDescription *font_description;
  PangoContext *context;

  g_return_if_fail(GST_IS_TIMEOVERLAY(videofilter));
  timeoverlay = GST_TIMEOVERLAY(videofilter);

  /* if any setup needs to be done, do it here */

  /* what does this affect? */
  context = pango_ft2_get_context (100, 100);

  pango_context_set_language (context, pango_language_from_string ("en_US"));
  pango_context_set_base_dir (context, PANGO_DIRECTION_LTR);

  font_description = pango_font_description_new ();
  pango_font_description_set_family (font_description, g_strdup ("Monospace"));
  pango_font_description_set_style (font_description, PANGO_STYLE_NORMAL);
  pango_font_description_set_variant (font_description, PANGO_VARIANT_NORMAL);
  pango_font_description_set_weight (font_description, PANGO_WEIGHT_NORMAL);
  pango_font_description_set_stretch (font_description, PANGO_STRETCH_NORMAL);
  pango_font_description_set_size (font_description, 12 * PANGO_SCALE);

  pango_context_set_font_description (context, font_description);

  timeoverlay->context = context;
  timeoverlay->font_description = font_description;

}

static char *gst_timeoverlay_print_smpte_time(guint64 time)
{
  int hours;
  int minutes;
  int seconds;
  int ms;
  double x;

  x = rint((time + 500000)*1e-6);

  hours = floor(x/(60*60*1000));
  x -= hours*60*60*1000;
  minutes = floor(x/(60*1000));
  x -= minutes*60*1000;
  seconds = floor(x/(1000));
  x -= seconds*1000;
  ms = rint(x);

  return g_strdup_printf("%02d:%02d:%02d.%03d",hours,minutes,seconds,ms);
}

static void gst_timeoverlay_planar411(GstVideofilter *videofilter,
    void *dest, void *src)
{
  GstTimeoverlay *timeoverlay;
  int height;
  int width;
  PangoRectangle logical_rect;
  PangoLayout *layout;
  int b_height, b_width;
  FT_Bitmap bitmap;
  char *string;
  int i;

  g_return_if_fail(GST_IS_TIMEOVERLAY(videofilter));
  timeoverlay = GST_TIMEOVERLAY(videofilter);

  width = gst_videofilter_get_input_width(videofilter);
  height = gst_videofilter_get_input_height(videofilter);

  layout = pango_layout_new (timeoverlay->context);
  string = gst_timeoverlay_print_smpte_time(GST_BUFFER_TIMESTAMP(videofilter->in_buf));
  pango_layout_set_text (layout, string, strlen(string));
  g_free(string);

  pango_layout_set_alignment (layout, PANGO_ALIGN_LEFT);
  pango_layout_set_width (layout, -1);

  pango_layout_get_extents (layout, NULL, &logical_rect);
  b_height = PANGO_PIXELS (logical_rect.height);
  b_width = PANGO_PIXELS (logical_rect.width);

  //hheight = 20;

  memcpy(dest, src, videofilter->from_buf_size);

  for(i=0;i<b_height;i++){
    memset(dest + i*width, 0, b_width);
  }
  for(i=0;i<b_height/2;i++){
    memset(dest + width*height + i*(width/2), 128, b_width/2);
    memset(dest + width*height + (width/2)*(height/2) + i*(width/2), 128,
	b_width/2);
  }
  bitmap.rows = b_height;
  bitmap.width = b_width;
  bitmap.pitch = width;
  bitmap.buffer = dest;
  bitmap.num_grays = 256;
  bitmap.pixel_mode = ft_pixel_mode_grays;

  pango_ft2_render_layout (&bitmap, layout, 0, 0);
}