gstinterpolationcontrolsource.c

gnash 在pc和嵌入式下开发需要的源码

/* GStreamer
 *
 * Copyright (C) 2007 Sebastian Dröge <[e-mail]>
 *
 * gstinterpolationcontrolsource.c: Control source that provides several
 *                                  interpolation methods
 *
 * 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.
 */

/**
 * SECTION:gstinterpolationcontrolsource
 * @short_description: interpolation control source
 *
 * #GstInterpolationControlSource is a #GstControlSource, that interpolates values between user-given
 * control points. It supports several interpolation modes and property types.
 *
 * To use #GstInterpolationControlSource get a new instance by calling
 * gst_interpolation_control_source_new(), bind it to a #GParamSpec, select a interpolation mode with
 * gst_interpolation_control_source_set_interpolation_mode() and set some control points by calling
 * gst_interpolation_control_source_set().
 *
 * All functions are MT-safe.
 *
 */

#include <glib-object.h>
#include <gst/gst.h>

#include "gstcontrolsource.h"
#include "gstinterpolationcontrolsource.h"
#include "gstinterpolationcontrolsourceprivate.h"

extern GstInterpolateMethod *interpolation_methods[];
extern guint num_interpolation_methods;

static void gst_interpolation_control_source_init (GstInterpolationControlSource
    * self);
static void
gst_interpolation_control_source_class_init (GstInterpolationControlSourceClass
    * klass);

G_DEFINE_TYPE (GstInterpolationControlSource, gst_interpolation_control_source,
    GST_TYPE_CONTROL_SOURCE);

static GObjectClass *parent_class = NULL;

/*
 * gst_control_point_free:
 * @prop: the object to free
 *
 * Private method which frees all data allocated by a #GstControlPoint
 * instance.
 */
static void
gst_control_point_free (GstControlPoint * cp)
{
  g_return_if_fail (cp);

  g_value_unset (&cp->value);
  g_free (cp);
}

static void
gst_interpolation_control_source_reset (GstInterpolationControlSource * self)
{
  GstControlSource *csource = GST_CONTROL_SOURCE (self);

  csource->get_value = NULL;
  csource->get_value_array = NULL;

  self->priv->type = self->priv->base = G_TYPE_INVALID;

  if (G_IS_VALUE (&self->priv->default_value))
    g_value_unset (&self->priv->default_value);
  if (G_IS_VALUE (&self->priv->minimum_value))
    g_value_unset (&self->priv->minimum_value);
  if (G_IS_VALUE (&self->priv->maximum_value))
    g_value_unset (&self->priv->maximum_value);

  if (self->priv->values) {
    g_list_foreach (self->priv->values, (GFunc) gst_control_point_free, NULL);
    g_list_free (self->priv->values);
    self->priv->values = NULL;
  }

  self->priv->nvalues = 0;
  self->priv->last_requested_value = NULL;
  self->priv->valid_cache = FALSE;
}

/**
 * gst_interpolation_control_source_new:
 *
 * This returns a new, unbound #GstInterpolationControlSource.
 *
 * Returns: a new, unbound #GstInterpolationControlSource.
 */
GstInterpolationControlSource *
gst_interpolation_control_source_new ()
{
  return g_object_new (GST_TYPE_INTERPOLATION_CONTROL_SOURCE, NULL);
}

/**
 * gst_interpolation_control_source_set_interpolation_mode:
 * @self: the #GstInterpolationControlSource object
 * @mode: interpolation mode
 *
 * Sets the given interpolation mode.
 *
 * <note><para>User interpolation is not yet available and quadratic interpolation
 * is deprecated and maps to cubic interpolation.</para></note>
 *
 * Returns: %TRUE if the interpolation mode could be set, %FALSE otherwise
 */
gboolean
    gst_interpolation_control_source_set_interpolation_mode
    (GstInterpolationControlSource * self, GstInterpolateMode mode) {
  gboolean ret = TRUE;
  GstControlSource *csource = GST_CONTROL_SOURCE (self);

  if (mode >= num_interpolation_methods || interpolation_methods[mode] == NULL) {
    GST_WARNING ("interpolation mode %d invalid or not implemented yet", mode);
    return FALSE;
  }

  if (mode == GST_INTERPOLATE_QUADRATIC) {
    GST_WARNING ("Quadratic interpolation mode is deprecated, using cubic"
        "interpolation mode");
  }

  if (mode == GST_INTERPOLATE_USER) {
    GST_WARNING ("User interpolation mode is not implemented yet");
    return FALSE;
  }

  g_mutex_lock (self->lock);
  switch (self->priv->base) {
    case G_TYPE_INT:
      csource->get_value = interpolation_methods[mode]->get_int;
      csource->get_value_array =
          interpolation_methods[mode]->get_int_value_array;
      break;
    case G_TYPE_UINT:{
      csource->get_value = interpolation_methods[mode]->get_uint;
      csource->get_value_array =
          interpolation_methods[mode]->get_uint_value_array;
      break;
    }
    case G_TYPE_LONG:{
      csource->get_value = interpolation_methods[mode]->get_long;
      csource->get_value_array =
          interpolation_methods[mode]->get_long_value_array;
      break;
    }
    case G_TYPE_ULONG:{
      csource->get_value = interpolation_methods[mode]->get_ulong;
      csource->get_value_array =
          interpolation_methods[mode]->get_ulong_value_array;
      break;
    }
    case G_TYPE_INT64:{
      csource->get_value = interpolation_methods[mode]->get_int64;
      csource->get_value_array =
          interpolation_methods[mode]->get_int64_value_array;
      break;
    }
    case G_TYPE_UINT64:{
      csource->get_value = interpolation_methods[mode]->get_uint64;
      csource->get_value_array =
          interpolation_methods[mode]->get_uint64_value_array;
      break;
    }
    case G_TYPE_FLOAT:{
      csource->get_value = interpolation_methods[mode]->get_float;
      csource->get_value_array =
          interpolation_methods[mode]->get_float_value_array;
      break;
    }
    case G_TYPE_DOUBLE:{
      csource->get_value = interpolation_methods[mode]->get_double;
      csource->get_value_array =
          interpolation_methods[mode]->get_double_value_array;
      break;
    }
    case G_TYPE_BOOLEAN:{
      csource->get_value = interpolation_methods[mode]->get_boolean;
      csource->get_value_array =
          interpolation_methods[mode]->get_boolean_value_array;
      break;
    }
    case G_TYPE_ENUM:{
      csource->get_value = interpolation_methods[mode]->get_enum;
      csource->get_value_array =
          interpolation_methods[mode]->get_enum_value_array;
      break;
    }
    case G_TYPE_STRING:{
      csource->get_value = interpolation_methods[mode]->get_string;
      csource->get_value_array =
          interpolation_methods[mode]->get_string_value_array;
      break;
    }
    default:
      ret = FALSE;
      break;
  }

  /* Incomplete implementation */
  if (!ret || !csource->get_value || !csource->get_value_array) {
    gst_interpolation_control_source_reset (self);
    ret = FALSE;
  }

  self->priv->valid_cache = FALSE;
  self->priv->interpolation_mode = mode;

  g_mutex_unlock (self->lock);

  return ret;
}

static gboolean
gst_interpolation_control_source_bind (GstControlSource * source,
    GParamSpec * pspec)
{
  GType type, base;
  GstInterpolationControlSource *self =
      GST_INTERPOLATION_CONTROL_SOURCE (source);
  gboolean ret = TRUE;

  /* get the fundamental base type */
  self->priv->type = base = type = G_PARAM_SPEC_VALUE_TYPE (pspec);
  while ((type = g_type_parent (type)))
    base = type;

  self->priv->base = base;
  /* restore type */
  type = self->priv->type;

  if (!gst_interpolation_control_source_set_interpolation_mode (self,
          self->priv->interpolation_mode))
    return FALSE;

  switch (base) {
    case G_TYPE_INT:{
      GParamSpecInt *tpspec = G_PARAM_SPEC_INT (pspec);

      g_value_init (&self->priv->default_value, type);
      g_value_set_int (&self->priv->default_value, tpspec->default_value);
      g_value_init (&self->priv->minimum_value, type);
      g_value_set_int (&self->priv->minimum_value, tpspec->minimum);
      g_value_init (&self->priv->maximum_value, type);
      g_value_set_int (&self->priv->maximum_value, tpspec->maximum);
      break;
    }
    case G_TYPE_UINT:{
      GParamSpecUInt *tpspec = G_PARAM_SPEC_UINT (pspec);

      g_value_init (&self->priv->default_value, type);
      g_value_set_uint (&self->priv->default_value, tpspec->default_value);
      g_value_init (&self->priv->minimum_value, type);
      g_value_set_uint (&self->priv->minimum_value, tpspec->minimum);
      g_value_init (&self->priv->maximum_value, type);
      g_value_set_uint (&self->priv->maximum_value, tpspec->maximum);
      break;
    }
    case G_TYPE_LONG:{
      GParamSpecLong *tpspec = G_PARAM_SPEC_LONG (pspec);

      g_value_init (&self->priv->default_value, type);
      g_value_set_long (&self->priv->default_value, tpspec->default_value);
      g_value_init (&self->priv->minimum_value, type);
      g_value_set_long (&self->priv->minimum_value, tpspec->minimum);
      g_value_init (&self->priv->maximum_value, type);
      g_value_set_long (&self->priv->maximum_value, tpspec->maximum);
      break;
    }
    case G_TYPE_ULONG:{
      GParamSpecULong *tpspec = G_PARAM_SPEC_ULONG (pspec);

      g_value_init (&self->priv->default_value, type);
      g_value_set_ulong (&self->priv->default_value, tpspec->default_value);
      g_value_init (&self->priv->minimum_value, type);
      g_value_set_ulong (&self->priv->minimum_value, tpspec->minimum);
      g_value_init (&self->priv->maximum_value, type);
      g_value_set_ulong (&self->priv->maximum_value, tpspec->maximum);
      break;
    }
    case G_TYPE_INT64:{
      GParamSpecInt64 *tpspec = G_PARAM_SPEC_INT64 (pspec);

      g_value_init (&self->priv->default_value, type);
      g_value_set_int64 (&self->priv->default_value, tpspec->default_value);
      g_value_init (&self->priv->minimum_value, type);
      g_value_set_int64 (&self->priv->minimum_value, tpspec->minimum);
      g_value_init (&self->priv->maximum_value, type);
      g_value_set_int64 (&self->priv->maximum_value, tpspec->maximum);
      break;
    }
    case G_TYPE_UINT64:{
      GParamSpecUInt64 *tpspec = G_PARAM_SPEC_UINT64 (pspec);

      g_value_init (&self->priv->default_value, type);
      g_value_set_uint64 (&self->priv->default_value, tpspec->default_value);
      g_value_init (&self->priv->minimum_value, type);
      g_value_set_uint64 (&self->priv->minimum_value, tpspec->minimum);
      g_value_init (&self->priv->maximum_value, type);
      g_value_set_uint64 (&self->priv->maximum_value, tpspec->maximum);
      break;
    }
    case G_TYPE_FLOAT:{
      GParamSpecFloat *tpspec = G_PARAM_SPEC_FLOAT (pspec);

      g_value_init (&self->priv->default_value, type);
      g_value_set_float (&self->priv->default_value, tpspec->default_value);
      g_value_init (&self->priv->minimum_value, type);
      g_value_set_float (&self->priv->minimum_value, tpspec->minimum);
      g_value_init (&self->priv->maximum_value, type);
      g_value_set_float (&self->priv->maximum_value, tpspec->maximum);