gstreamer/ext/libcaca/gstcacasink.c

/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 *
 * 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.
 */

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

#include <string.h>
#include <sys/time.h>
#include <gst/navigation/navigation.h>

#include "gstcacasink.h"

/* elementfactory information */
static GstElementDetails gst_cacasink_details = {
  "CACA sink",
  "Sink/Video",
  "A colored ASCII art videosink",
  "Zeeshan Ali <zak147@yahoo.com>"
};

/* cacasink signals and args */
enum
{
  LAST_SIGNAL
};


enum
{
  ARG_0,
  ARG_SCREEN_WIDTH,
  ARG_SCREEN_HEIGHT,
  ARG_DITHER,
  ARG_ANTIALIASING
};

static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB ";" GST_VIDEO_CAPS_RGBx ";"
        GST_VIDEO_CAPS_RGB_16 ";" GST_VIDEO_CAPS_RGB_15)
    );

static void gst_cacasink_base_init (gpointer g_class);
static void gst_cacasink_class_init (GstCACASinkClass * klass);
static void gst_cacasink_init (GstCACASink * cacasink);
static void gst_cacasink_interface_init (GstImplementsInterfaceClass * klass);
static gboolean gst_cacasink_interface_supported (GstImplementsInterface *
    iface, GType type);
static void gst_cacasink_navigation_init (GstNavigationInterface * iface);
static void gst_cacasink_navigation_send_event (GstNavigation * navigation,
    GstStructure * structure);

static void gst_cacasink_chain (GstPad * pad, GstData * _data);

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

static GstElementStateReturn gst_cacasink_change_state (GstElement * element);

static GstElementClass *parent_class = NULL;

GType
gst_cacasink_get_type (void)
{
  static GType cacasink_type = 0;

  if (!cacasink_type) {
    static const GTypeInfo cacasink_info = {
      sizeof (GstCACASinkClass),
      gst_cacasink_base_init,
      NULL,
      (GClassInitFunc) gst_cacasink_class_init,
      NULL,
      NULL,
      sizeof (GstCACASink),
      0,
      (GInstanceInitFunc) gst_cacasink_init,
    };

    static const GInterfaceInfo iface_info = {
      (GInterfaceInitFunc) gst_cacasink_interface_init,
      NULL,
      NULL,
    };

    static const GInterfaceInfo navigation_info = {
      (GInterfaceInitFunc) gst_cacasink_navigation_init,
      NULL,
      NULL,
    };

    cacasink_type =
        g_type_register_static (GST_TYPE_VIDEOSINK, "GstCACASink",
        &cacasink_info, 0);

    g_type_add_interface_static (cacasink_type, GST_TYPE_IMPLEMENTS_INTERFACE,
        &iface_info);
    g_type_add_interface_static (cacasink_type, GST_TYPE_NAVIGATION,
        &navigation_info);
  }
  return cacasink_type;
}

#define GST_TYPE_CACADITHER (gst_cacasink_dither_get_type())
static GType
gst_cacasink_dither_get_type (void)
{
  static GType dither_type = 0;

  if (!dither_type) {
    GEnumValue *dithers;
    gint n_dithers;
    gint i;
    gchar *caca_dithernames[] = {
      "NONE", "ORDERED2", "ORDERED4", "ORDERED8", "RANDOM", NULL
    };

    n_dithers = 5;

    dithers = g_new0 (GEnumValue, n_dithers + 1);

    for (i = 0; i < n_dithers; i++) {
      dithers[i].value = i;
      dithers[i].value_name = g_strdup (caca_dithernames[i]);
      dithers[i].value_nick = g_strdup (caca_dithernames[i]);
    }
    dithers[i].value = 0;
    dithers[i].value_name = NULL;
    dithers[i].value_nick = NULL;

    dither_type = g_enum_register_static ("GstCACASinkDithers", dithers);
  }
  return dither_type;
}

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

  gst_element_class_set_details (element_class, &gst_cacasink_details);
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&sink_template));
}

static void
gst_cacasink_class_init (GstCACASinkClass * klass)
{
  GObjectClass *gobject_class;
  GstElementClass *gstelement_class;
  GstVideoSinkClass *gstvs_class;

  gobject_class = (GObjectClass *) klass;
  gstelement_class = (GstElementClass *) klass;
  gstvs_class = (GstVideoSinkClass *) klass;

  parent_class = g_type_class_ref (GST_TYPE_ELEMENT);

  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SCREEN_WIDTH, g_param_spec_int ("screen_width", "screen_width", "screen_width", G_MININT, G_MAXINT, 0, G_PARAM_READABLE));       /* CHECKME */
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_SCREEN_HEIGHT, g_param_spec_int ("screen_height", "screen_height", "screen_height", G_MININT, G_MAXINT, 0, G_PARAM_READABLE));   /* CHECKME */
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_DITHER,
      g_param_spec_enum ("dither", "Dither Type", "Set type of Dither",
          GST_TYPE_CACADITHER, 0, G_PARAM_READWRITE));
  g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_ANTIALIASING,
      g_param_spec_boolean ("anti_aliasing", "Anti-Aliasing",
          "Enables Anti-Aliasing", TRUE, G_PARAM_READWRITE));

  gobject_class->set_property = gst_cacasink_set_property;
  gobject_class->get_property = gst_cacasink_get_property;

  gstelement_class->change_state = gst_cacasink_change_state;
}

static void
gst_cacasink_interface_init (GstImplementsInterfaceClass * klass)
{
  klass->supported = gst_cacasink_interface_supported;
}

static gboolean
gst_cacasink_interface_supported (GstImplementsInterface * iface, GType type)
{
  g_assert (type == GST_TYPE_NAVIGATION);

  return (GST_STATE (iface) != GST_STATE_NULL);
}

static void
gst_cacasink_navigation_init (GstNavigationInterface * iface)
{
  iface->send_event = gst_cacasink_navigation_send_event;
}

static void
gst_cacasink_navigation_send_event (GstNavigation * navigation,
    GstStructure * structure)
{
  GstCACASink *cacasink = GST_CACASINK (navigation);
  GstEvent *event;

  event = gst_event_new (GST_EVENT_NAVIGATION);
  /*GST_EVENT_TIMESTAMP (event) = 0; */
  event->event_data.structure.structure = structure;

  /* FIXME 
   * Obviously, the pointer x,y coordinates need to be adjusted by the
   * window size and relation to the bounding window. */

  gst_pad_send_event (gst_pad_get_peer (GST_VIDEOSINK_PAD (cacasink)), event);
}

static GstPadLinkReturn
gst_cacasink_sinkconnect (GstPad * pad, const GstCaps * caps)
{
  GstCACASink *cacasink;
  GstStructure *structure;

  cacasink = GST_CACASINK (gst_pad_get_parent (pad));

  /* We cannot use library functions if the sink is not open */
  if (!GST_FLAG_IS_SET (GST_ELEMENT (cacasink), GST_CACASINK_OPEN))
    return GST_PAD_LINK_DELAYED;
  /*if (!GST_CAPS_IS_FIXED (caps))
     return GST_PAD_LINK_DELAYED; */

  structure = gst_caps_get_structure (caps, 0);
  gst_structure_get_int (structure, "width", &(GST_VIDEOSINK_WIDTH (cacasink)));
  gst_structure_get_int (structure, "height",
      &(GST_VIDEOSINK_HEIGHT (cacasink)));
  gst_structure_get_int (structure, "bpp", &cacasink->bpp);
  gst_structure_get_int (structure, "red_mask", &cacasink->red_mask);
  gst_structure_get_int (structure, "green_mask", &cacasink->green_mask);
  gst_structure_get_int (structure, "blue_mask", &cacasink->blue_mask);

  if (cacasink->bpp == 24) {
    cacasink->red_mask = GUINT32_FROM_BE (cacasink->red_mask) >> 8;
    cacasink->green_mask = GUINT32_FROM_BE (cacasink->green_mask) >> 8;
    cacasink->blue_mask = GUINT32_FROM_BE (cacasink->blue_mask) >> 8;
  }

  else if (cacasink->bpp == 32) {
    cacasink->red_mask = GUINT32_FROM_BE (cacasink->red_mask);
    cacasink->green_mask = GUINT32_FROM_BE (cacasink->green_mask);
    cacasink->blue_mask = GUINT32_FROM_BE (cacasink->blue_mask);
  }

  else if (cacasink->bpp == 16 || cacasink->bpp == 15) {
    cacasink->red_mask = GUINT16_FROM_BE (cacasink->red_mask);
    cacasink->green_mask = GUINT16_FROM_BE (cacasink->green_mask);
    cacasink->blue_mask = GUINT16_FROM_BE (cacasink->blue_mask);
  }

  if (cacasink->bitmap) {
    caca_free_bitmap (cacasink->bitmap);
  }

  cacasink->bitmap = caca_create_bitmap (cacasink->bpp,
      GST_VIDEOSINK_WIDTH (cacasink),
      GST_VIDEOSINK_HEIGHT (cacasink),
      GST_VIDEOSINK_WIDTH (cacasink) * cacasink->bpp / 8,
      cacasink->red_mask, cacasink->green_mask, cacasink->blue_mask, 0);

  if (!cacasink->bitmap) {
    return GST_PAD_LINK_DELAYED;
  }

  return GST_PAD_LINK_OK;
}

static void
gst_cacasink_init (GstCACASink * cacasink)
{
  GST_VIDEOSINK_PAD (cacasink) =
      gst_pad_new_from_template (gst_static_pad_template_get (&sink_template),
      "sink");
  gst_element_add_pad (GST_ELEMENT (cacasink), GST_VIDEOSINK_PAD (cacasink));
  gst_pad_set_chain_function (GST_VIDEOSINK_PAD (cacasink), gst_cacasink_chain);
  gst_pad_set_link_function (GST_VIDEOSINK_PAD (cacasink),
      gst_cacasink_sinkconnect);

  cacasink->screen_width = GST_CACA_DEFAULT_SCREEN_WIDTH;
  cacasink->screen_height = GST_CACA_DEFAULT_SCREEN_HEIGHT;
  cacasink->bpp = GST_CACA_DEFAULT_BPP;
  cacasink->red_mask = GST_CACA_DEFAULT_RED_MASK;
  cacasink->green_mask = GST_CACA_DEFAULT_GREEN_MASK;
  cacasink->blue_mask = GST_CACA_DEFAULT_BLUE_MASK;

  GST_FLAG_SET (cacasink, GST_ELEMENT_THREAD_SUGGESTED);
}

static void
gst_cacasink_chain (GstPad * pad, GstData * _data)
{
  GstBuffer *buf = GST_BUFFER (_data);
  GstCACASink *cacasink;

  g_return_if_fail (pad != NULL);
  g_return_if_fail (GST_IS_PAD (pad));
  g_return_if_fail (buf != NULL);

  cacasink = GST_CACASINK (gst_pad_get_parent (pad));
  /* We cannot use library functions if the sink is not open */
  if (!GST_FLAG_IS_SET (GST_ELEMENT (cacasink), GST_CACASINK_OPEN))
    return;

  GST_DEBUG ("videosink: clock wait: %" G_GUINT64_FORMAT,
      GST_BUFFER_TIMESTAMP (buf));

  if (GST_VIDEOSINK_CLOCK (cacasink) && GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
    gst_element_wait (GST_ELEMENT (cacasink), GST_BUFFER_TIMESTAMP (buf));
  }

  caca_clear ();
  caca_draw_bitmap (0, 0, cacasink->screen_width - 1,
      cacasink->screen_height - 1, cacasink->bitmap, GST_BUFFER_DATA (buf));
  caca_refresh ();

  gst_buffer_unref (buf);
}

static void
gst_cacasink_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
  GstCACASink *cacasink;

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

  cacasink = GST_CACASINK (object);

  switch (prop_id) {
    case ARG_DITHER:{
      cacasink->dither = g_value_get_enum (value);
      caca_set_dithering (cacasink->dither + CACA_DITHERING_NONE);
      break;
    }
    case ARG_ANTIALIASING:{
      cacasink->antialiasing = g_value_get_boolean (value);
      if (cacasink->antialiasing) {
        caca_set_feature (CACA_ANTIALIASING_MAX);
      }

      else {
        caca_set_feature (CACA_ANTIALIASING_MIN);
      }
      break;
    }
    default:
      break;
  }
}

static void
gst_cacasink_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
  GstCACASink *cacasink;

  /* it's not null if we got it, but it might not be ours */
  cacasink = GST_CACASINK (object);

  switch (prop_id) {
    case ARG_SCREEN_WIDTH:{
      g_value_set_int (value, cacasink->screen_width);
      break;
    }
    case ARG_SCREEN_HEIGHT:{
      g_value_set_int (value, cacasink->screen_height);
      break;
    }
    case ARG_DITHER:{
      g_value_set_enum (value, cacasink->dither);
      break;
    }
    case ARG_ANTIALIASING:{
      g_value_set_boolean (value, cacasink->antialiasing);
      break;
    }
    default:{
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
  }
}

static gboolean
gst_cacasink_open (GstCACASink * cacasink)
{
  g_return_val_if_fail (!GST_FLAG_IS_SET (cacasink, GST_CACASINK_OPEN), FALSE);

  cacasink->bitmap = NULL;
  caca_init ();

  cacasink->screen_width = caca_get_width ();
  cacasink->screen_height = caca_get_height ();
  cacasink->antialiasing = TRUE;
  caca_set_feature (CACA_ANTIALIASING_MAX);
  cacasink->dither = 0;
  caca_set_dithering (CACA_DITHERING_NONE);


  GST_FLAG_SET (cacasink, GST_CACASINK_OPEN);

  return TRUE;
}

static void
gst_cacasink_close (GstCACASink * cacasink)
{
  g_return_if_fail (GST_FLAG_IS_SET (cacasink, GST_CACASINK_OPEN));

  if (cacasink->bitmap) {
    caca_free_bitmap (cacasink->bitmap);
    cacasink->bitmap = NULL;
  }
  caca_end ();

  GST_FLAG_UNSET (cacasink, GST_CACASINK_OPEN);
}

static GstElementStateReturn
gst_cacasink_change_state (GstElement * element)
{
  g_return_val_if_fail (GST_IS_CACASINK (element), GST_STATE_FAILURE);

  if (GST_STATE_PENDING (element) == GST_STATE_NULL) {
    if (GST_FLAG_IS_SET (element, GST_CACASINK_OPEN))
      gst_cacasink_close (GST_CACASINK (element));
  } else {
    if (!GST_FLAG_IS_SET (element, GST_CACASINK_OPEN)) {
      if (!gst_cacasink_open (GST_CACASINK (element)))
        return GST_STATE_FAILURE;
    }
  }

  if (GST_ELEMENT_CLASS (parent_class)->change_state)
    return GST_ELEMENT_CLASS (parent_class)->change_state (element);

  return GST_STATE_SUCCESS;
}

static gboolean
plugin_init (GstPlugin * plugin)
{
  /* Loading the library containing GstVideoSink, our parent object */
  if (!gst_library_load ("gstvideo"))
    return FALSE;

  if (!gst_element_register (plugin, "cacasink", GST_RANK_NONE,
          GST_TYPE_CACASINK))
    return FALSE;

  return TRUE;
}

GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
    GST_VERSION_MINOR,
    "cacasink",
    "Colored ASCII Art video sink",
    plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)