gstreamer/ext/gdk_pixbuf/pixbufscale.c

/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 * Copyright (C) <2004> Jan Schmidt <thaytan@mad.scientist.com>
 * Copyright (C) <2004> Tim-Philipp Mueller <t.i.m@orange.net>
 *
 * 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 <pixbufscale.h>
#include <gst/video/video.h>
#include <gdk-pixbuf/gdk-pixbuf.h>

#define ROUND_UP_2(x)  (((x)+1)&~1)
#define ROUND_UP_4(x)  (((x)+3)&~3)
#define ROUND_UP_8(x)  (((x)+7)&~7)

/* These match the ones gstffmpegcolorspace uses (Tim) */
#define GST_RGB24_ROWSTRIDE(width)    (ROUND_UP_4 ((width)*3))
#define GST_RGB24_SIZE(width,height)  ((height)*GST_RGB24_ROWSTRIDE(width))


GST_DEBUG_CATEGORY_STATIC (pixbufscale_debug);
#define GST_CAT_DEFAULT pixbufscale_debug

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

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

static GstStaticPadTemplate gst_pixbufscale_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
    GST_PAD_SRC,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB)
    );

static GstStaticPadTemplate gst_pixbufscale_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
    GST_PAD_SINK,
    GST_PAD_ALWAYS,
    GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB)
    );

#define GST_TYPE_PIXBUFSCALE_METHOD (gst_pixbufscale_method_get_type())
static GType
gst_pixbufscale_method_get_type (void)
{
  static GType pixbufscale_method_type = 0;
  static const GEnumValue pixbufscale_methods[] = {
    {GST_PIXBUFSCALE_NEAREST, "0", "Nearest Neighbour"},
    {GST_PIXBUFSCALE_TILES, "1", "Tiles"},
    {GST_PIXBUFSCALE_BILINEAR, "2", "Bilinear"},
    {GST_PIXBUFSCALE_HYPER, "3", "Hyper"},
    {0, NULL, NULL},
  };

  if (!pixbufscale_method_type) {
    pixbufscale_method_type =
        g_enum_register_static ("GstPixbufScaleMethod", pixbufscale_methods);
  }
  return pixbufscale_method_type;
}

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

static GstCaps *gst_pixbufscale_transform_caps (GstBaseTransform * trans,
    GstPadDirection direction, GstCaps * caps);
static gboolean gst_pixbufscale_set_caps (GstBaseTransform * trans,
    GstCaps * in, GstCaps * out);
static gboolean gst_pixbufscale_get_unit_size (GstBaseTransform * trans,
    GstCaps * caps, guint * size);
static void gst_pixbufscale_fixate_caps (GstBaseTransform * base,
    GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static GstFlowReturn gst_pixbufscale_transform (GstBaseTransform * trans,
    GstBuffer * in, GstBuffer * out);
static gboolean gst_pixbufscale_handle_src_event (GstPad * pad,
    GstEvent * event);


static gboolean parse_caps (GstCaps * caps, gint * width, gint * height);

GST_BOILERPLATE (GstPixbufScale, gst_pixbufscale, GstBaseTransform,
    GST_TYPE_BASE_TRANSFORM);

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

  gst_element_class_set_details_simple (element_class, "GdkPixbuf image scaler",
      "Filter/Effect/Video", "Resizes video",
      "Jan Schmidt <thaytan@mad.scientist.com>, "
      "Wim Taymans <wim.taymans@chello.be>, "
      "Renato Filho <renato.filho@indt.org.br>");

  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_pixbufscale_src_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_pixbufscale_sink_template));
}

static void
gst_pixbufscale_class_init (GstPixbufScaleClass * klass)
{
  GObjectClass *gobject_class;
  GstBaseTransformClass *trans_class;

  gobject_class = (GObjectClass *) klass;
  trans_class = (GstBaseTransformClass *) klass;

  gobject_class->set_property = gst_pixbufscale_set_property;
  gobject_class->get_property = gst_pixbufscale_get_property;

  g_object_class_install_property (gobject_class,
      ARG_METHOD,
      g_param_spec_enum ("method", "method", "method",
          GST_TYPE_PIXBUFSCALE_METHOD, GST_PIXBUFSCALE_BILINEAR,
          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));

  trans_class->transform_caps =
      GST_DEBUG_FUNCPTR (gst_pixbufscale_transform_caps);
  trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_pixbufscale_set_caps);
  trans_class->get_unit_size =
      GST_DEBUG_FUNCPTR (gst_pixbufscale_get_unit_size);
  trans_class->transform = GST_DEBUG_FUNCPTR (gst_pixbufscale_transform);
  trans_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_pixbufscale_fixate_caps);
  trans_class->passthrough_on_same_caps = TRUE;

  parent_class = g_type_class_peek_parent (klass);
}

static void
gst_pixbufscale_init (GstPixbufScale * pixbufscale,
    GstPixbufScaleClass * kclass)
{
  GstBaseTransform *trans;

  GST_DEBUG_OBJECT (pixbufscale, "_init");
  trans = GST_BASE_TRANSFORM (pixbufscale);

  gst_pad_set_event_function (trans->srcpad, gst_pixbufscale_handle_src_event);

  pixbufscale->method = GST_PIXBUFSCALE_TILES;
  pixbufscale->gdk_method = GDK_INTERP_TILES;
}

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

  g_return_if_fail (GST_IS_PIXBUFSCALE (object));
  src = GST_PIXBUFSCALE (object);

  switch (prop_id) {
    case ARG_METHOD:
      src->method = g_value_get_enum (value);
      switch (src->method) {
        case GST_PIXBUFSCALE_NEAREST:
          src->gdk_method = GDK_INTERP_NEAREST;
          break;
        case GST_PIXBUFSCALE_TILES:
          src->gdk_method = GDK_INTERP_TILES;
          break;
        case GST_PIXBUFSCALE_BILINEAR:
          src->gdk_method = GDK_INTERP_BILINEAR;
          break;
        case GST_PIXBUFSCALE_HYPER:
          src->gdk_method = GDK_INTERP_HYPER;
          break;
      }
      break;
    default:
      break;
  }
}

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

  g_return_if_fail (GST_IS_PIXBUFSCALE (object));
  src = GST_PIXBUFSCALE (object);

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


static GstCaps *
gst_pixbufscale_transform_caps (GstBaseTransform * trans,
    GstPadDirection direction, GstCaps * caps)
{
  GstCaps *ret;
  int i;

  ret = gst_caps_copy (caps);

  for (i = 0; i < gst_caps_get_size (ret); i++) {
    GstStructure *structure = gst_caps_get_structure (ret, i);

    gst_structure_set (structure,
        "width", GST_TYPE_INT_RANGE, 16, 4096,
        "height", GST_TYPE_INT_RANGE, 16, 4096, NULL);
    gst_structure_remove_field (structure, "pixel-aspect-ratio");
  }

  GST_DEBUG_OBJECT (trans, "returning caps: %" GST_PTR_FORMAT, ret);
  return ret;
}

static gboolean
parse_caps (GstCaps * caps, gint * width, gint * height)
{
  gboolean ret;
  GstStructure *structure;

  structure = gst_caps_get_structure (caps, 0);
  ret = gst_structure_get_int (structure, "width", width);
  ret &= gst_structure_get_int (structure, "height", height);

  return ret;
}

static gboolean
gst_pixbufscale_set_caps (GstBaseTransform * trans, GstCaps * in, GstCaps * out)
{
  GstPixbufScale *pixbufscale;
  gboolean ret;

  pixbufscale = GST_PIXBUFSCALE (trans);
  ret = parse_caps (in, &pixbufscale->from_width, &pixbufscale->from_height);
  ret &= parse_caps (out, &pixbufscale->to_width, &pixbufscale->to_height);
  if (!ret)
    goto done;

  pixbufscale->from_stride = GST_ROUND_UP_4 (pixbufscale->from_width * 3);
  pixbufscale->from_buf_size =
      pixbufscale->from_stride * pixbufscale->from_height;

  pixbufscale->to_stride = GST_ROUND_UP_4 (pixbufscale->to_width * 3);
  pixbufscale->to_buf_size = pixbufscale->to_stride * pixbufscale->to_height;

  GST_DEBUG_OBJECT (pixbufscale, "from=%dx%d, size %d -> to=%dx%d, size %d",
      pixbufscale->from_width, pixbufscale->from_height,
      pixbufscale->from_buf_size, pixbufscale->to_width, pixbufscale->to_height,
      pixbufscale->to_buf_size);

done:
  return ret;
}


static gboolean
gst_pixbufscale_get_unit_size (GstBaseTransform * trans,
    GstCaps * caps, guint * size)
{
  gint width, height;

  g_assert (size);

  if (!parse_caps (caps, &width, &height))
    return FALSE;

  *size = GST_ROUND_UP_4 (width * 3) * height;

  return TRUE;
}

static void
gst_pixbufscale_fixate_caps (GstBaseTransform * base, GstPadDirection direction,
    GstCaps * caps, GstCaps * othercaps)
{
  GstStructure *ins, *outs;
  const GValue *from_par, *to_par;

  g_return_if_fail (gst_caps_is_fixed (caps));

  GST_DEBUG_OBJECT (base, "trying to fixate othercaps %" GST_PTR_FORMAT
      " based on caps %" GST_PTR_FORMAT, othercaps, caps);

  ins = gst_caps_get_structure (caps, 0);
  outs = gst_caps_get_structure (othercaps, 0);

  from_par = gst_structure_get_value (ins, "pixel-aspect-ratio");
  to_par = gst_structure_get_value (outs, "pixel-aspect-ratio");

  if (from_par && to_par) {
    GValue to_ratio = { 0, };   /* w/h of output video */
    int from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d;
    int count = 0, w = 0, h = 0, num, den;

    /* if both width and height are already fixed, we can't do anything
     *      * about it anymore */
    if (gst_structure_get_int (outs, "width", &w))
      ++count;
    if (gst_structure_get_int (outs, "height", &h))
      ++count;
    if (count == 2) {
      GST_DEBUG_OBJECT (base, "dimensions already set to %dx%d, not fixating",
          w, h);
      return;
    }

    gst_structure_get_int (ins, "width", &from_w);
    gst_structure_get_int (ins, "height", &from_h);
    from_par_n = gst_value_get_fraction_numerator (from_par);
    from_par_d = gst_value_get_fraction_denominator (from_par);
    to_par_n = gst_value_get_fraction_numerator (to_par);
    to_par_d = gst_value_get_fraction_denominator (to_par);

    g_value_init (&to_ratio, GST_TYPE_FRACTION);
    gst_value_set_fraction (&to_ratio, from_w * from_par_n * to_par_d,
        from_h * from_par_d * to_par_n);
    num = gst_value_get_fraction_numerator (&to_ratio);
    den = gst_value_get_fraction_denominator (&to_ratio);
    GST_DEBUG_OBJECT (base,
        "scaling input with %dx%d and PAR %d/%d to output PAR %d/%d",
        from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d);
    GST_DEBUG_OBJECT (base,
        "resulting output should respect ratio of %d/%d", num, den);

    /* now find a width x height that respects this display ratio.
     *      * prefer those that have one of w/h the same as the incoming video
     *           * using wd / hd = num / den */

    /* start with same height, because of interlaced video */
    /* check hd / den is an integer scale factor, and scale wd with the PAR */
    if (from_h % den == 0) {
      GST_DEBUG_OBJECT (base, "keeping video height");
      h = from_h;
      w = h * num / den;
    } else if (from_w % num == 0) {
      GST_DEBUG_OBJECT (base, "keeping video width");
      w = from_w;
      h = w * den / num;
    } else {
      GST_DEBUG_OBJECT (base, "approximating but keeping video height");
      h = from_h;
      w = h * num / den;
    }
    GST_DEBUG_OBJECT (base, "scaling to %dx%d", w, h);
    /* now fixate */
    gst_structure_fixate_field_nearest_int (outs, "width", w);
    gst_structure_fixate_field_nearest_int (outs, "height", h);
  } else {
    gint width, height;

    if (gst_structure_get_int (ins, "width", &width)) {
      if (gst_structure_has_field (outs, "width")) {
        gst_structure_fixate_field_nearest_int (outs, "width", width);
      }
    }
    if (gst_structure_get_int (ins, "height", &height)) {
      if (gst_structure_has_field (outs, "height")) {
        gst_structure_fixate_field_nearest_int (outs, "height", height);
      }
    }
  }

  GST_DEBUG_OBJECT (base, "fixated othercaps to %" GST_PTR_FORMAT, othercaps);
}

static GstFlowReturn
gst_pixbufscale_transform (GstBaseTransform * trans,
    GstBuffer * in, GstBuffer * out)
{
  GstPixbufScale *scale;
  GdkPixbuf *src_pixbuf, *dest_pixbuf;

  scale = GST_PIXBUFSCALE (trans);

  src_pixbuf =
      gdk_pixbuf_new_from_data (GST_BUFFER_DATA (in), GDK_COLORSPACE_RGB, FALSE,
      8, scale->from_width, scale->from_height,
      GST_RGB24_ROWSTRIDE (scale->from_width), NULL, NULL);

  dest_pixbuf =
      gdk_pixbuf_new_from_data (GST_BUFFER_DATA (out), GDK_COLORSPACE_RGB,
      FALSE, 8, scale->to_width, scale->to_height,
      GST_RGB24_ROWSTRIDE (scale->to_width), NULL, NULL);

  gdk_pixbuf_scale (src_pixbuf, dest_pixbuf, 0, 0,
      scale->to_width,
      scale->to_height, 0, 0,
      (double) scale->to_width / scale->from_width,
      (double) scale->to_height / scale->from_height, scale->gdk_method);

  g_object_unref (src_pixbuf);
  g_object_unref (dest_pixbuf);

  return GST_FLOW_OK;
}

static gboolean
gst_pixbufscale_handle_src_event (GstPad * pad, GstEvent * event)
{
  GstPixbufScale *pixbufscale;
  gboolean ret;
  double a;
  GstStructure *structure;

  pixbufscale = GST_PIXBUFSCALE (gst_pad_get_parent (pad));

  GST_DEBUG_OBJECT (pixbufscale, "handling %s event",
      GST_EVENT_TYPE_NAME (event));

  switch (GST_EVENT_TYPE (event)) {
    case GST_EVENT_NAVIGATION:
      event =
          GST_EVENT (gst_mini_object_make_writable (GST_MINI_OBJECT (event)));

      structure = (GstStructure *) gst_event_get_structure (event);
      if (gst_structure_get_double (structure, "pointer_x", &a)) {
        gst_structure_set (structure, "pointer_x", G_TYPE_DOUBLE,
            a * pixbufscale->from_width / pixbufscale->to_width, NULL);
      }
      if (gst_structure_get_double (structure, "pointer_y", &a)) {
        gst_structure_set (structure, "pointer_y", G_TYPE_DOUBLE,
            a * pixbufscale->from_height / pixbufscale->to_height, NULL);
      }
      break;
    default:
      break;
  }

  ret = gst_pad_event_default (pad, event);

  gst_object_unref (pixbufscale);

  return ret;
}

gboolean
pixbufscale_init (GstPlugin * plugin)
{
  if (!gst_element_register (plugin, "gdkpixbufscale", GST_RANK_NONE,
          GST_TYPE_PIXBUFSCALE))
    return FALSE;

  GST_DEBUG_CATEGORY_INIT (pixbufscale_debug, "gdkpixbufscale", 0,
      "pixbufscale element");

  return TRUE;
}