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#ifndef _GSTREAMERMM_VALUE_H
#define _GSTREAMERMM_VALUE_H
#include <glibmm/ustring.h>
#include <sigc++/sigc++.h>
/* gstreamermm - a C++ wrapper for gstreamer
*
* Copyright 2008-2016 The gstreamermm Development Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <gst/gst.h>
#include <gst/gstvalue.h>
#include <glibmm/value_custom.h>
namespace Gst
{
/** @defgroup GstHelperClasses gstreamermm Helper Classes
* Classes used to represent GStreamer internal GValue types such as
* GST_TYPE_FRACTION, etc.
*/
/** A class that represents a 4 byte identifier (used in codecs).
* Gst::Fourcc is used to store a four byte identifier in Gst::Structure of
* Gst::Caps as a value representing a property (see GStreamer Application
* Development Manual section 8.2.2 and GstValue docs). When the value is set,
* it is transformed to a GStreamer GType so retrieving the value is a bit
* different. The class can be used in setting and getting a Gst::Structure
* field like so:
*
* @code
* Glib::Value<Gst::Fourcc> value;
* value.init(Glib::Value<Gst::Fourcc>::value_type());
* value.set(Gst::Fourcc('M', 'J', 'P', 'G'));
*
* Gst::Structure structure("my-structure");
* structure.set_field("id", value);
* ...
* Glib::ValueBase gst_value;
* structure.get_field("id", gst_value);
* Gst::Fourcc fourcc(gst_value);
* char first_char = fourcc.first;
* ...
* @endcode
*
* Last reviewed on 2016-08-27 (1.8.0)
*
* @ingroup GstHelperClasses
*/
class Fourcc
{
public:
/** Construct an undefined Gst::Fourcc.
*/
Fourcc();
/** Construct a Gst::Fourcc from another.
*/
Fourcc(const Fourcc& src);
/** Construct a Gst::Fourcc from 4 characters.
*/
Fourcc(char first, char second, char third, char fourth);
/** Construct a Gst::Fourcc from an input string. Caller is responsible for
* ensuring the input string consists of at least four characters.
*/
explicit Fourcc(const Glib::ustring& s);
/** Construct a Gst::Fourcc from a 32 bit unsigned integer.
*/
explicit Fourcc(guint32 fourcc);
Fourcc& operator=(const Fourcc& src);
public:
public:
char first;
char second;
char third;
char fourth;
private:
void set_ccs(guint32 fourcc);
};
/** A class that represents a fraction.
* Gst::Fraction is used to store a fraction in Gst::Structures of Gst::Caps as
* a value representing a property (see GStreamer Application Development
* Manual section 8.2.2 and GstValue docs). When the value is set, it is
* transformed to a GStreamer GType so retrieving the value is a bit different.
* The class can be used in setting and getting a Gst::Structure field like so:
*
* @code
* Glib::Value<Gst::Fraction> value;
* value.init(Glib::Value<Gst::Fraction>::value_type());
* value.set(Gst::Fraction(25,1));
*
* Gst::Structure structure("my-structure");
* structure.set_field("framerate", value);
* ...
* Glib::ValueBase gst_value;
* structure.get_field("framerate", gst_value);
* Gst::Fraction fract(gst_value);
* int numerator = fract.num;
* ...
* @endcode
*
* Last reviewed on 2016-08-27 (1.8.0)
*
* @ingroup GstHelperClasses
*/
class Fraction
{
public:
/** Constructs a zero Gst::Fraction (0/1).
*/
Fraction();
/** Constructs a Gst::Fraction from another.
*/
Fraction(const Fraction& src);
/** Constructs a Gst::Fraction (num/denom).
*/
Fraction(int num, int denom);
/** Constructs a Gst::Fraction from a GST_TYPE_FRACTION.
*/
explicit Fraction(const Glib::ValueBase& gst_fraction_value);
/** Constructs a Gst::Fraction from a GST_TYPE_FRACTION.
*/
explicit Fraction(const GValue& gst_fraction_value);
Fraction& operator=(const Fraction& src);
public:
int num;
int denom;
};
/** A class that represents a range (min - max).
* Gst::Range is used to store a range in Gst::Structures of
* Gst::Caps as a value representing a property (see GStreamer Application
* Development Manual section 8.2.2 and GstValue docs). When the value is set,
* it is transformed to a GStreamer GType so retrieving the value is a bit
* different. The class can be used in setting and getting a Gst::Structure
* field like so:
*
* @code
* Glib::Value<Gst::Range<int>> value;
* value.init(Glib::Value<Gst::Range<int>>::value_type());
* value.set(Gst::Range<int>(8000, 50000));
*
* Gst::Structure structure("my-structure");
* structure.set_field("rate", value);
* ...
* Glib::ValueBase gst_value;
* structure.get_field("rate", gst_value);
* Gst::Range<int> range(gst_value);
* int max = range.max;
* ...
* @endcode
*
* Gst::Range should be used with following types: int, double, Gst::Fraction.
*
* Last reviewed on 2016-08-27 (1.8.0)
*
* @ingroup GstHelperClasses
*/
template<typename T>
class Range
{
public:
/** Constructs a zero Gst::Range.
*/
Range() : min(T()), max(T()) {}
/** Constructs a Gst::Range (min - max).
*/
Range(T min, T max) : min(min), max(max) {}
/** Constructs an Gst::Range from another range.
*/
Range(const Range& src) : min(src.min), max(src.max) {}
/** Constructs an Gst::Range from a Glib::ValueBase.
*/
explicit Range(const Glib::Value<Range<T>>& range_value)
{
min = range_value.get().min;
max = range_value.get().max;
}
/** Constructs an Gst::Range from a GValue.
*/
explicit Range(const GValue& range_value)
{
init_range(range_value);
}
Range& operator=(const Range& src)
{
min = src.min;
max = src.max;
return *this;
}
public:
T min;
T max;
private:
void init_range(const GValue& range_value);
};
} //namespace Gst
#ifndef DOXYGEN_SHOULD_SKIP_THIS
namespace Glib
{
template<>
class Value<Gst::Fourcc> : public Value<unsigned int>
{
public:
typedef Gst::Fourcc CppType;
typedef guint32 CType;
static GType value_type() G_GNUC_CONST;
void set(const Gst::Fourcc& data);
Gst::Fourcc get() const;
};
template<>
class Value<Gst::Range<int>> : public ValueBase_Boxed
{
public:
typedef Gst::Range<int> CppType;
static GType value_type() G_GNUC_CONST;
void set(const Gst::Range<int>& data);
Gst::Range<int> get() const;
};
template<>
class Value<Gst::Range<double>> : public ValueBase_Boxed
{
public:
typedef Gst::Range<double> CppType;
static GType value_type() G_GNUC_CONST;
void set(const Gst::Range<double>& data);
Gst::Range<double> get() const;
};
template<>
class Value<Gst::Fraction> : public ValueBase_Boxed
{
public:
typedef Gst::Fraction CppType;
static GType value_type() G_GNUC_CONST;
void set(const Gst::Fraction& data);
Gst::Fraction get() const;
};
template<>
class Value<Gst::Range<Gst::Fraction>> : public ValueBase_Boxed
{
public:
typedef Gst::Range<Gst::Fraction> CppType;
static GType value_type() G_GNUC_CONST;
void set(const Gst::Range<Gst::Fraction>& data);
Gst::Range<Gst::Fraction> get() const;
};
} // namespace Glib
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
#endif /* _GSTREAMERMM_VALUE_H */
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