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290 lines
8.8 KiB
C
290 lines
8.8 KiB
C
/* GStreamer
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* Copyright (C) <2003> David A. Schleef <ds@schleef.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_VALUE_H__
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#define __GST_VALUE_H__
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#include <gst/gstconfig.h>
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#include <gst/gstcaps.h>
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G_BEGIN_DECLS
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/**
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* GST_MAKE_FOURCC:
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* @a: the first character
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* @b: the second character
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* @c: the third character
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* @d: the fourth character
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*
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* Transform four characters into a #guint32 fourcc value with host
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* endianness.
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* <informalexample>
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* <programlisting>
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* guint32 fourcc = GST_MAKE_FOURCC ('M', 'J', 'P', 'G');
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* </programlisting>
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* </informalexample>
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*/
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#define GST_MAKE_FOURCC(a,b,c,d) (guint32)((a)|(b)<<8|(c)<<16|(d)<<24)
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/**
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* GST_STR_FOURCC:
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* @f: a string with at least four characters
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*
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* Transform an input string into a #guint32 fourcc value with host
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* endianness.
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* Caller is responsible for ensuring the input string consists of at least
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* four characters.
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* <informalexample>
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* <programlisting>
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* guint32 fourcc = GST_STR_FOURCC ("MJPG");
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* </programlisting>
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* </informalexample>
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*/
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#define GST_STR_FOURCC(f) (guint32)(((f)[0])|((f)[1]<<8)|((f)[2]<<16)|((f)[3]<<24))
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/**
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* GST_FOURCC_FORMAT:
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*
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* Can be used together with #GST_FOURCC_ARGS to properly output a
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* #guint32 fourcc value in a printf()-style text message.
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* <informalexample>
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* <programlisting>
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* printf ("fourcc: %" GST_FOURCC_FORMAT "\n", GST_FOURCC_ARGS (fcc));
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* </programlisting>
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* </informalexample>
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*/
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#define GST_FOURCC_FORMAT "%c%c%c%c"
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/**
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* GST_FOURCC_ARGS:
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* @fourcc: a #guint32 fourcc value to output
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*
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* Can be used together with #GST_FOURCC_FORMAT to properly output a
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* #guint32 fourcc value in a printf()-style text message.
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*/
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#define GST_FOURCC_ARGS(fourcc) \
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((gchar) ((fourcc) &0xff)), \
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((gchar) (((fourcc)>>8 )&0xff)), \
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((gchar) (((fourcc)>>16)&0xff)), \
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((gchar) (((fourcc)>>24)&0xff))
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/**
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* GST_VALUE_HOLDS_FOURCC:
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* @x: the #GValue to check
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*
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* Checks if the given #GValue contains a #GST_TYPE_FOURCC value.
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*/
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#define GST_VALUE_HOLDS_FOURCC(x) (G_VALUE_HOLDS(x, gst_type_fourcc))
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/**
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* GST_VALUE_HOLDS_INT_RANGE:
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* @x: the #GValue to check
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*
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* Checks if the given #GValue contains a #GST_TYPE_INT_RANGE value.
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*/
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#define GST_VALUE_HOLDS_INT_RANGE(x) (G_VALUE_HOLDS(x, gst_type_int_range))
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/**
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* GST_VALUE_HOLDS_DOUBLE_RANGE:
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* @x: the #GValue to check
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*
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* Checks if the given #GValue contains a #GST_TYPE_DOUBLE_RANGE value.
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*/
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#define GST_VALUE_HOLDS_DOUBLE_RANGE(x) (G_VALUE_HOLDS(x, gst_type_double_range))
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#define GST_VALUE_HOLDS_LIST(x) (G_VALUE_HOLDS(x, gst_type_list))
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#define GST_VALUE_HOLDS_ARRAY(x) (G_VALUE_HOLDS(x, gst_type_array))
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#define GST_VALUE_HOLDS_CAPS(x) (G_VALUE_HOLDS(x, GST_TYPE_CAPS))
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#define GST_VALUE_HOLDS_BUFFER(x) (G_VALUE_HOLDS(x, GST_TYPE_BUFFER))
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#define GST_VALUE_HOLDS_FRACTION(x) (G_VALUE_HOLDS(x, gst_type_fraction))
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#define GST_TYPE_FOURCC gst_type_fourcc
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#define GST_TYPE_INT_RANGE gst_type_int_range
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#define GST_TYPE_DOUBLE_RANGE gst_type_double_range
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/**
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* GST_TYPE_LIST:
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*
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* a #GValue type that represents an unordered list of #GValue values
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*
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* Returns: the #GType of GstValueList (which is not explicitly typed)
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*/
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#define GST_TYPE_LIST gst_type_list
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/**
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* GST_TYPE_ARRAY:
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*
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* a #GValue type that represents an ordered list of #GValue values
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*
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* Returns: the #GType of GstArrayList (which is not explicitly typed)
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*/
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#define GST_TYPE_ARRAY gst_type_array
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/**
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* GST_TYPE_FRACTION:
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*
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* a #GValue type that represents a fraction of an integer numerator over
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* an integer denominator
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*
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* Returns: the #GType of GstFraction (which is not explicitly typed)
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*/
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#define GST_TYPE_FRACTION gst_type_fraction
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#define GST_VALUE_LESS_THAN (-1)
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#define GST_VALUE_EQUAL 0
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#define GST_VALUE_GREATER_THAN 1
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#define GST_VALUE_UNORDERED 2
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typedef int (* GstValueCompareFunc) (const GValue *value1,
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const GValue *value2);
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typedef char * (* GstValueSerializeFunc) (const GValue *value1);
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typedef gboolean (* GstValueDeserializeFunc) (GValue *dest,
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const char *s);
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typedef int (* GstValueUnionFunc) (GValue *dest,
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const GValue *value1,
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const GValue *value2);
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typedef int (* GstValueIntersectFunc) (GValue *dest,
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const GValue *value1,
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const GValue *value2);
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typedef int (* GstValueSubtractFunc) (GValue *dest,
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const GValue *minuend,
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const GValue *subtrahend);
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typedef struct _GstValueTable GstValueTable;
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struct _GstValueTable {
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GType type;
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GstValueCompareFunc compare;
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GstValueSerializeFunc serialize;
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GstValueDeserializeFunc deserialize;
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/*< private >*/
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void *_gst_reserved [GST_PADDING];
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};
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GST_EXPORT GType gst_type_fourcc;
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GST_EXPORT GType gst_type_int_range;
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GST_EXPORT GType gst_type_double_range;
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GST_EXPORT GType gst_type_list;
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GST_EXPORT GType gst_type_array;
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GST_EXPORT GType gst_type_fraction;
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void gst_value_register (const GstValueTable *table);
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void gst_value_init_and_copy (GValue *dest,
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const GValue *src);
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gchar * gst_value_serialize (const GValue *value);
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gboolean gst_value_deserialize (GValue *dest,
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const gchar *src);
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/* list */
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void gst_value_list_append_value (GValue *value,
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const GValue *append_value);
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void gst_value_list_prepend_value (GValue *value,
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const GValue *prepend_value);
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void gst_value_list_concat (GValue *dest,
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const GValue *value1,
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const GValue *value2);
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guint gst_value_list_get_size (const GValue *value);
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G_CONST_RETURN GValue *
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gst_value_list_get_value (const GValue *value,
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guint index);
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/* fourcc */
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void gst_value_set_fourcc (GValue *value,
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guint32 fourcc);
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guint32 gst_value_get_fourcc (const GValue *value);
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/* int range */
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void gst_value_set_int_range (GValue *value,
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int start,
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int end);
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int gst_value_get_int_range_min (const GValue *value);
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int gst_value_get_int_range_max (const GValue *value);
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/* double range */
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void gst_value_set_double_range (GValue *value,
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double start,
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double end);
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double gst_value_get_double_range_min (const GValue *value);
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double gst_value_get_double_range_max (const GValue *value);
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/* caps */
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G_CONST_RETURN GstCaps *
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gst_value_get_caps (const GValue *value);
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void gst_value_set_caps (GValue *value,
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const GstCaps *caps);
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/* fraction */
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void gst_value_set_fraction (GValue *value,
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int numerator,
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int denominator);
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int gst_value_get_fraction_numerator (const GValue *value);
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int gst_value_get_fraction_denominator(const GValue *value);
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gboolean gst_value_fraction_multiply (GValue *product,
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const GValue *factor1,
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const GValue *factor2);
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/* compare */
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int gst_value_compare (const GValue *value1,
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const GValue *value2);
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gboolean gst_value_can_compare (const GValue *value1,
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const GValue *value2);
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/* union */
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gboolean gst_value_union (GValue *dest,
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const GValue *value1,
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const GValue *value2);
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gboolean gst_value_can_union (const GValue *value1,
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const GValue *value2);
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void gst_value_register_union_func (GType type1,
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GType type2,
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GstValueUnionFunc func);
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/* intersection */
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gboolean gst_value_intersect (GValue *dest,
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const GValue *value1,
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const GValue *value2);
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gboolean gst_value_can_intersect (const GValue *value1,
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const GValue *value2);
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void gst_value_register_intersect_func (GType type1,
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GType type2,
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GstValueIntersectFunc func);
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/* subtraction */
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gboolean gst_value_subtract (GValue *dest,
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const GValue *minuend,
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const GValue *subtrahend);
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gboolean gst_value_can_subtract (const GValue *minuend,
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const GValue *subtrahend);
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void gst_value_register_subtract_func (GType minuend_type,
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GType subtrahend_type,
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GstValueSubtractFunc func);
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/* fixation */
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gboolean gst_value_is_fixed (const GValue *value);
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/* private */
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void _gst_value_initialize (void);
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G_END_DECLS
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#endif
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