mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-13 11:56:35 +00:00
c8380cb0d2
Maybe gcc can do something clever with that, or at least warn us if we don't save the return value somewhere.
594 lines
17 KiB
C
594 lines
17 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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#include <gst/gststructure.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_fourcc_get_type ()))
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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_int_range_get_type ()))
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/**
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* GST_VALUE_HOLDS_INT64_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_INT64_RANGE value.
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*
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* Since: 0.10.31
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*/
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#define GST_VALUE_HOLDS_INT64_RANGE(x) (G_VALUE_HOLDS((x), gst_int64_range_get_type ()))
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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_double_range_get_type ()))
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/**
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* GST_VALUE_HOLDS_FRACTION_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_FRACTION_RANGE value.
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*/
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#define GST_VALUE_HOLDS_FRACTION_RANGE(x) (G_VALUE_HOLDS((x), gst_fraction_range_get_type ()))
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/**
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* GST_VALUE_HOLDS_LIST:
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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_LIST value.
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*/
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#define GST_VALUE_HOLDS_LIST(x) (G_VALUE_HOLDS((x), gst_value_list_get_type ()))
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/**
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* GST_VALUE_HOLDS_ARRAY:
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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_ARRAY value.
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*/
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#define GST_VALUE_HOLDS_ARRAY(x) (G_VALUE_HOLDS((x), gst_value_array_get_type ()))
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/**
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* GST_VALUE_HOLDS_CAPS:
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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_CAPS value.
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*/
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#define GST_VALUE_HOLDS_CAPS(x) (G_VALUE_HOLDS((x), GST_TYPE_CAPS))
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/**
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* GST_VALUE_HOLDS_STRUCTURE:
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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_STRUCTURE value.
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*
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* Since: 0.10.15
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*/
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#define GST_VALUE_HOLDS_STRUCTURE(x) (G_VALUE_HOLDS((x), GST_TYPE_STRUCTURE))
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/**
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* GST_VALUE_HOLDS_BUFFER:
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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_BUFFER value.
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*/
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#define GST_VALUE_HOLDS_BUFFER(x) (G_VALUE_HOLDS((x), GST_TYPE_BUFFER))
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/**
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* GST_VALUE_HOLDS_FRACTION:
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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_FRACTION value.
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*/
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#define GST_VALUE_HOLDS_FRACTION(x) (G_VALUE_HOLDS((x), gst_fraction_get_type ()))
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/**
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* GST_VALUE_HOLDS_DATE:
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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_DATE value.
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*/
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#define GST_VALUE_HOLDS_DATE(x) (G_VALUE_HOLDS((x), gst_date_get_type ()))
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/**
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* GST_VALUE_HOLDS_DATE_TIME:
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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_DATE_TIME value.
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*
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* Since: 0.10.31
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*/
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#define GST_VALUE_HOLDS_DATE_TIME(x) (G_VALUE_HOLDS((x), gst_date_time_get_type ()))
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/**
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* GST_TYPE_FOURCC:
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*
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* a #GValue type that represents 4 byte identifier (e.g. used for codecs)
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*
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* Returns: the #GType of GstFourcc
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*/
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#define GST_TYPE_FOURCC gst_fourcc_get_type ()
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/**
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* GST_TYPE_INT_RANGE:
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*
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* a #GValue type that represents an integer range
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*
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* Returns: the #GType of GstIntRange
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*/
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#define GST_TYPE_INT_RANGE gst_int_range_get_type ()
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/**
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* GST_TYPE_INT64_RANGE:
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*
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* a #GValue type that represents an #gint64 range
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*
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* Returns: the #GType of GstInt64Range
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*
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* Since: 0.10.31
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*/
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#define GST_TYPE_INT64_RANGE gst_int64_range_get_type ()
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/**
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* GST_TYPE_DOUBLE_RANGE:
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*
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* a #GValue type that represents a floating point range with double precission
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*
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* Returns: the #GType of GstIntRange
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*/
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#define GST_TYPE_DOUBLE_RANGE gst_double_range_get_type ()
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/**
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* GST_TYPE_FRACTION_RANGE:
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*
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* a #GValue type that represents a GstFraction range
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*
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* Returns: the #GType of GstFractionRange
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*/
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#define GST_TYPE_FRACTION_RANGE gst_fraction_range_get_type ()
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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. This
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* is used for example to express a list of possible values for a field in
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* a caps structure, like a list of possible sample rates, of which only one
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* will be chosen in the end. This means that all values in the list are
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* meaningful on their own.
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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_value_list_get_type ()
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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. This is
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* used to express a set of values that is meaningful only in their specific
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* combination and order of values. Each value on its own is not particularly
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* meaningful, only the ordered array in its entirety is meaningful. This is
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* used for example to express channel layouts for multichannel audio where
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* each channel needs to be mapped to a position in the room.
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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_value_array_get_type ()
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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_fraction_get_type ()
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/**
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* GST_TYPE_DATE:
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*
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* a boxed #GValue type for #GDate that represents a date.
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*
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* Returns: the #GType of GstDate
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*/
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#define GST_TYPE_DATE gst_date_get_type ()
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/**
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* GST_TYPE_DATE_TIME:
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*
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* a boxed #GValue type for #GstDateTime that represents a date and time.
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*
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* Returns: the #GType of GstDateTime
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* Since: 0.10.31
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*/
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#define GST_TYPE_DATE_TIME gst_date_time_get_type ()
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/**
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* GST_VALUE_LESS_THAN:
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*
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* Indicates that the first value provided to a comparison function
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* (gst_value_compare()) is lesser than the second one.
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*/
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#define GST_VALUE_LESS_THAN (-1)
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/**
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* GST_VALUE_EQUAL:
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*
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* Indicates that the first value provided to a comparison function
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* (gst_value_compare()) is equal to the second one.
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*/
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#define GST_VALUE_EQUAL 0
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/**
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* GST_VALUE_GREATER_THAN:
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*
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* Indicates that the first value provided to a comparison function
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* (gst_value_compare()) is greater than the second one.
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*/
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#define GST_VALUE_GREATER_THAN 1
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/**
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* GST_VALUE_UNORDERED:
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*
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* Indicates that the comparison function (gst_value_compare()) can not
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* determine a order for the two provided values.
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*/
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#define GST_VALUE_UNORDERED 2
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/**
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* GstValueCompareFunc:
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* @value1: first value for comparison
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* @value2: second value for comparison
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*
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* Used together with gst_value_compare() to compare #GValue items.
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*
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* Returns: one of GST_VALUE_LESS_THAN, GST_VALUE_EQUAL, GST_VALUE_GREATER_THAN
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* or GST_VALUE_UNORDERED
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*/
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typedef gint (* GstValueCompareFunc) (const GValue *value1,
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const GValue *value2);
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/**
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* GstValueSerializeFunc:
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* @value1: a #GValue
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*
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* Used by gst_value_serialize() to obtain a non-binary form of the #GValue.
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*
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* Free-function: g_free
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*
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* Returns: (transfer full): the string representation of the value
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*/
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typedef gchar * (* GstValueSerializeFunc) (const GValue *value1);
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/**
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* GstValueDeserializeFunc:
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* @dest: a #GValue
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* @s: a string
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*
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* Used by gst_value_deserialize() to parse a non-binary form into the #GValue.
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*
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* Returns: %TRUE for success
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*/
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typedef gboolean (* GstValueDeserializeFunc) (GValue *dest,
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const gchar *s);
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/**
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* GstValueUnionFunc:
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* @dest: a #GValue for the result
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* @value1: a #GValue operand
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* @value2: a #GValue operand
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*
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* Used by gst_value_union() to perform unification for a specific #GValue
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* type. Register a new implementation with gst_value_register_union_func().
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*
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* Returns: %TRUE if a union was successful
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*/
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typedef gboolean (* GstValueUnionFunc) (GValue *dest,
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const GValue *value1,
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const GValue *value2);
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/**
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* GstValueIntersectFunc:
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* @dest: (out caller-allocates): a #GValue for the result
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* @value1: a #GValue operand
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* @value2: a #GValue operand
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*
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* Used by gst_value_intersect() to perform intersection for a specific #GValue
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* type. If the intersection is non-empty, the result is
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* placed in @dest and TRUE is returned. If the intersection is
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* empty, @dest is unmodified and FALSE is returned.
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* Register a new implementation with gst_value_register_intersect_func().
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*
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* Returns: %TRUE if the values can intersect
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*/
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typedef gboolean (* GstValueIntersectFunc) (GValue *dest,
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const GValue *value1,
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const GValue *value2);
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/**
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* GstValueSubtractFunc:
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* @dest: (out caller-allocates): a #GValue for the result
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* @minuend: a #GValue operand
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* @subtrahend: a #GValue operand
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*
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* Used by gst_value_subtract() to perform subtraction for a specific #GValue
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* type. Register a new implementation with gst_value_register_subtract_func().
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*
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* Returns: %TRUE if the subtraction is not empty
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*/
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typedef gboolean (* 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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/**
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* GstValueTable:
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* @type: a #GType
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* @compare: a #GstValueCompareFunc
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* @serialize: a #GstValueSerializeFunc
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* @deserialize: a #GstValueDeserializeFunc
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*
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* VTable for the #GValue @type.
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*/
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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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GType gst_int_range_get_type (void);
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GType gst_int64_range_get_type (void);
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GType gst_double_range_get_type (void);
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GType gst_fraction_range_get_type (void);
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GType gst_fourcc_get_type (void);
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GType gst_fraction_get_type (void);
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GType gst_value_list_get_type (void);
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GType gst_value_array_get_type (void);
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GType gst_date_get_type (void);
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GType gst_date_time_get_type (void);
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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) G_GNUC_MALLOC;
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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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void gst_value_list_merge (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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const GValue * gst_value_list_get_value (const GValue *value,
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guint index);
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/* array */
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void gst_value_array_append_value (GValue *value,
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const GValue *append_value);
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void gst_value_array_prepend_value (GValue *value,
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const GValue *prepend_value);
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guint gst_value_array_get_size (const GValue *value);
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const GValue * gst_value_array_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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gint start,
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gint end);
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gint gst_value_get_int_range_min (const GValue *value);
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gint gst_value_get_int_range_max (const GValue *value);
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/* int64 range */
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void gst_value_set_int64_range (GValue *value,
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gint64 start,
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gint64 end);
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gint64 gst_value_get_int64_range_min (const GValue *value);
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gint64 gst_value_get_int64_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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gdouble start,
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gdouble end);
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gdouble gst_value_get_double_range_min (const GValue *value);
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gdouble gst_value_get_double_range_max (const GValue *value);
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/* caps */
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const GstCaps * 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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/* structure */
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const GstStructure *
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gst_value_get_structure (const GValue *value);
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void gst_value_set_structure (GValue *value,
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const GstStructure *structure);
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/* fraction */
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void gst_value_set_fraction (GValue *value,
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gint numerator,
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gint denominator);
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gint gst_value_get_fraction_numerator (const GValue *value);
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gint 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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gboolean gst_value_fraction_subtract (GValue * dest,
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const GValue * minuend,
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const GValue * subtrahend);
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/* fraction range */
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void gst_value_set_fraction_range (GValue *value,
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const GValue *start,
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const GValue *end);
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void gst_value_set_fraction_range_full (GValue *value,
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gint numerator_start,
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gint denominator_start,
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gint numerator_end,
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gint denominator_end);
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const GValue *gst_value_get_fraction_range_min (const GValue *value);
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const GValue *gst_value_get_fraction_range_max (const GValue *value);
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/* date */
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const GDate * gst_value_get_date (const GValue *value);
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void gst_value_set_date (GValue *value,
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const GDate *date);
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/* compare */
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gint 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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G_END_DECLS
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#endif
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