2 * Copyright (C) <2003> David A. Schleef <ds@schleef.org>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
20 #ifndef __GST_VALUE_H__
21 #define __GST_VALUE_H__
23 #include <gst/gstconfig.h>
24 #include <gst/gstcaps.h>
25 #include <gst/gststructure.h>
31 * @a: the first character
32 * @b: the second character
33 * @c: the third character
34 * @d: the fourth character
36 * Transform four characters into a #guint32 fourcc value with host
40 * guint32 fourcc = GST_MAKE_FOURCC ('M', 'J', 'P', 'G');
44 #define GST_MAKE_FOURCC(a,b,c,d) ((guint32)((a)|(b)<<8|(c)<<16|(d)<<24))
48 * @f: a string with at least four characters
50 * Transform an input string into a #guint32 fourcc value with host
52 * Caller is responsible for ensuring the input string consists of at least
56 * guint32 fourcc = GST_STR_FOURCC ("MJPG");
60 #define GST_STR_FOURCC(f) ((guint32)(((f)[0])|((f)[1]<<8)|((f)[2]<<16)|((f)[3]<<24)))
65 * Can be used together with #GST_FOURCC_ARGS to properly output a
66 * #guint32 fourcc value in a printf()-style text message.
69 * printf ("fourcc: %" GST_FOURCC_FORMAT "\n", GST_FOURCC_ARGS (fcc));
73 #define GST_FOURCC_FORMAT "c%c%c%c"
77 * @fourcc: a #guint32 fourcc value to output
79 * Can be used together with #GST_FOURCC_FORMAT to properly output a
80 * #guint32 fourcc value in a printf()-style text message.
82 #define GST_FOURCC_ARGS(fourcc) \
83 ((gchar) ((fourcc) &0xff)), \
84 ((gchar) (((fourcc)>>8 )&0xff)), \
85 ((gchar) (((fourcc)>>16)&0xff)), \
86 ((gchar) (((fourcc)>>24)&0xff))
89 * GST_VALUE_HOLDS_FOURCC:
90 * @x: the #GValue to check
92 * Checks if the given #GValue contains a #GST_TYPE_FOURCC value.
94 #define GST_VALUE_HOLDS_FOURCC(x) (G_VALUE_HOLDS((x), gst_fourcc_get_type ()))
97 * GST_VALUE_HOLDS_INT_RANGE:
98 * @x: the #GValue to check
100 * Checks if the given #GValue contains a #GST_TYPE_INT_RANGE value.
102 #define GST_VALUE_HOLDS_INT_RANGE(x) (G_VALUE_HOLDS((x), gst_int_range_get_type ()))
105 * GST_VALUE_HOLDS_DOUBLE_RANGE:
106 * @x: the #GValue to check
108 * Checks if the given #GValue contains a #GST_TYPE_DOUBLE_RANGE value.
110 #define GST_VALUE_HOLDS_DOUBLE_RANGE(x) (G_VALUE_HOLDS((x), gst_double_range_get_type ()))
113 * GST_VALUE_HOLDS_FRACTION_RANGE:
114 * @x: the #GValue to check
116 * Checks if the given #GValue contains a #GST_TYPE_FRACTION_RANGE value.
118 #define GST_VALUE_HOLDS_FRACTION_RANGE(x) (G_VALUE_HOLDS((x), gst_fraction_range_get_type ()))
121 * GST_VALUE_HOLDS_LIST:
122 * @x: the #GValue to check
124 * Checks if the given #GValue contains a #GST_TYPE_LIST value.
126 #define GST_VALUE_HOLDS_LIST(x) (G_VALUE_HOLDS((x), gst_value_list_get_type ()))
129 * GST_VALUE_HOLDS_ARRAY:
130 * @x: the #GValue to check
132 * Checks if the given #GValue contains a #GST_TYPE_ARRAY value.
134 #define GST_VALUE_HOLDS_ARRAY(x) (G_VALUE_HOLDS((x), gst_value_array_get_type ()))
137 * GST_VALUE_HOLDS_CAPS:
138 * @x: the #GValue to check
140 * Checks if the given #GValue contains a #GST_TYPE_CAPS value.
142 #define GST_VALUE_HOLDS_CAPS(x) (G_VALUE_HOLDS((x), GST_TYPE_CAPS))
145 * GST_VALUE_HOLDS_STRUCTURE:
146 * @x: the #GValue to check
148 * Checks if the given #GValue contains a #GST_TYPE_STRUCTURE value.
152 #define GST_VALUE_HOLDS_STRUCTURE(x) (G_VALUE_HOLDS((x), GST_TYPE_STRUCTURE))
155 * GST_VALUE_HOLDS_BUFFER:
156 * @x: the #GValue to check
158 * Checks if the given #GValue contains a #GST_TYPE_BUFFER value.
160 #define GST_VALUE_HOLDS_BUFFER(x) (G_VALUE_HOLDS((x), GST_TYPE_BUFFER))
163 * GST_VALUE_HOLDS_FRACTION:
164 * @x: the #GValue to check
166 * Checks if the given #GValue contains a #GST_TYPE_FRACTION value.
168 #define GST_VALUE_HOLDS_FRACTION(x) (G_VALUE_HOLDS((x), gst_fraction_get_type ()))
171 * GST_VALUE_HOLDS_DATE:
172 * @x: the #GValue to check
174 * Checks if the given #GValue contains a #GST_TYPE_DATE value.
176 #define GST_VALUE_HOLDS_DATE(x) (G_VALUE_HOLDS((x), gst_date_get_type ()))
179 * GST_VALUE_HOLDS_DATE_TIME:
180 * @x: the #GValue to check
182 * Checks if the given #GValue contains a #GST_TYPE_DATE_TIME value.
186 #define GST_VALUE_HOLDS_DATE_TIME(x) (G_VALUE_HOLDS((x), gst_date_time_get_type ()))
191 * a #GValue type that represents 4 byte identifier (e.g. used for codecs)
193 * Returns: the #GType of GstFourcc
195 #define GST_TYPE_FOURCC gst_fourcc_get_type ()
198 * GST_TYPE_INT_RANGE:
200 * a #GValue type that represents an integer range
202 * Returns: the #GType of GstIntRange
204 #define GST_TYPE_INT_RANGE gst_int_range_get_type ()
207 * GST_TYPE_DOUBLE_RANGE:
209 * a #GValue type that represents a floating point range with double precission
211 * Returns: the #GType of GstIntRange
213 #define GST_TYPE_DOUBLE_RANGE gst_double_range_get_type ()
216 * GST_TYPE_FRACTION_RANGE:
218 * a #GValue type that represents a GstFraction range
220 * Returns: the #GType of GstFractionRange
222 #define GST_TYPE_FRACTION_RANGE gst_fraction_range_get_type ()
227 * a #GValue type that represents an unordered list of #GValue values. This
228 * is used for example to express a list of possible values for a field in
229 * a caps structure, like a list of possible sample rates, of which only one
230 * will be chosen in the end. This means that all values in the list are
231 * meaningful on their own.
233 * Returns: the #GType of GstValueList (which is not explicitly typed)
235 #define GST_TYPE_LIST gst_value_list_get_type ()
240 * a #GValue type that represents an ordered list of #GValue values. This is
241 * used to express a set of values that is meaningful only in their specific
242 * combination and order of values. Each value on its own is not particularly
243 * meaningful, only the ordered array in its entirety is meaningful. This is
244 * used for example to express channel layouts for multichannel audio where
245 * each channel needs to be mapped to a position in the room.
247 * Returns: the #GType of GstArrayList (which is not explicitly typed)
249 #define GST_TYPE_ARRAY gst_value_array_get_type ()
254 * a #GValue type that represents a fraction of an integer numerator over
255 * an integer denominator
257 * Returns: the #GType of GstFraction (which is not explicitly typed)
260 #define GST_TYPE_FRACTION gst_fraction_get_type ()
265 * a boxed #GValue type for #GDate that represents a date.
267 * Returns: the #GType of GstDate
270 #define GST_TYPE_DATE gst_date_get_type ()
273 * GST_TYPE_DATE_TIME:
275 * a boxed #GValue type for #GstDateTime that represents a date and time.
277 * Returns: the #GType of GstDateTime
281 #define GST_TYPE_DATE_TIME gst_date_time_get_type ()
284 * GST_VALUE_LESS_THAN:
286 * Indicates that the first value provided to a comparison function
287 * (gst_value_compare()) is lesser than the second one.
289 #define GST_VALUE_LESS_THAN (-1)
294 * Indicates that the first value provided to a comparison function
295 * (gst_value_compare()) is equal to the second one.
297 #define GST_VALUE_EQUAL 0
300 * GST_VALUE_GREATER_THAN:
302 * Indicates that the first value provided to a comparison function
303 * (gst_value_compare()) is greater than the second one.
305 #define GST_VALUE_GREATER_THAN 1
308 * GST_VALUE_UNORDERED:
310 * Indicates that the comparison function (gst_value_compare()) can not
311 * determine a order for the two provided values.
313 #define GST_VALUE_UNORDERED 2
316 * GstValueCompareFunc:
317 * @value1: first value for comparison
318 * @value2: second value for comparison
320 * Used together with gst_value_compare() to compare #GValue items.
322 * Returns: one of GST_VALUE_LESS_THAN, GST_VALUE_EQUAL, GST_VALUE_GREATER_THAN
323 * or GST_VALUE_UNORDERED
325 typedef gint (* GstValueCompareFunc) (const GValue *value1,
326 const GValue *value2);
329 * GstValueSerializeFunc:
332 * Used by gst_value_serialize() to obtain a non-binary form of the #GValue.
334 * Returns: the string representation of the value
336 typedef gchar * (* GstValueSerializeFunc) (const GValue *value1);
339 * GstValueDeserializeFunc:
343 * Used by gst_value_deserialize() to parse a non-binary form into the #GValue.
345 * Returns: %TRUE for success
347 typedef gboolean (* GstValueDeserializeFunc) (GValue *dest,
352 * @dest: a #GValue for the result
353 * @value1: a #GValue operand
354 * @value2: a #GValue operand
356 * Used by gst_value_union() to perform unification for a specific #GValue
357 * type. Register a new implementation with gst_value_register_union_func().
359 * Returns: %TRUE if a union was successful
361 typedef gboolean (* GstValueUnionFunc) (GValue *dest,
362 const GValue *value1,
363 const GValue *value2);
366 * GstValueIntersectFunc:
367 * @dest: a #GValue for the result
368 * @value1: a #GValue operand
369 * @value2: a #GValue operand
371 * Used by gst_value_intersect() to perform intersection for a specific #GValue
372 * type. If the intersection is non-empty, the result is
373 * placed in @dest and TRUE is returned. If the intersection is
374 * empty, @dest is unmodified and FALSE is returned.
375 * Register a new implementation with gst_value_register_intersect_func().
377 * Returns: %TRUE if the values can intersect
379 typedef gboolean (* GstValueIntersectFunc) (GValue *dest,
380 const GValue *value1,
381 const GValue *value2);
384 * GstValueSubtractFunc:
385 * @dest: a #GValue for the result
386 * @minuend: a #GValue operand
387 * @subtrahend: a #GValue operand
389 * Used by gst_value_subtract() to perform subtraction for a specific #GValue
390 * type. Register a new implementation with gst_value_register_subtract_func().
392 * Returns: %TRUE if the subtraction is not empty
394 typedef gboolean (* GstValueSubtractFunc) (GValue *dest,
395 const GValue *minuend,
396 const GValue *subtrahend);
398 typedef struct _GstValueTable GstValueTable;
402 * @compare: a #GstValueCompareFunc
403 * @serialize: a #GstValueSerializeFunc
404 * @deserialize: a #GstValueDeserializeFunc
406 * VTable for the #GValue @type.
408 struct _GstValueTable {
410 GstValueCompareFunc compare;
411 GstValueSerializeFunc serialize;
412 GstValueDeserializeFunc deserialize;
415 void *_gst_reserved [GST_PADDING];
418 GType gst_int_range_get_type (void);
419 GType gst_double_range_get_type (void);
420 GType gst_fraction_range_get_type (void);
421 GType gst_fourcc_get_type (void);
422 GType gst_fraction_get_type (void);
423 GType gst_value_list_get_type (void);
424 GType gst_value_array_get_type (void);
426 GType gst_date_get_type (void);
427 GType gst_date_time_get_type (void);
429 void gst_value_register (const GstValueTable *table);
430 void gst_value_init_and_copy (GValue *dest,
433 gchar * gst_value_serialize (const GValue *value);
434 gboolean gst_value_deserialize (GValue *dest,
438 void gst_value_list_append_value (GValue *value,
439 const GValue *append_value);
440 void gst_value_list_prepend_value (GValue *value,
441 const GValue *prepend_value);
442 void gst_value_list_concat (GValue *dest,
443 const GValue *value1,
444 const GValue *value2);
445 guint gst_value_list_get_size (const GValue *value);
446 G_CONST_RETURN GValue *
447 gst_value_list_get_value (const GValue *value,
451 void gst_value_array_append_value (GValue *value,
452 const GValue *append_value);
453 void gst_value_array_prepend_value (GValue *value,
454 const GValue *prepend_value);
455 guint gst_value_array_get_size (const GValue *value);
456 G_CONST_RETURN GValue *
457 gst_value_array_get_value (const GValue *value,
461 void gst_value_set_fourcc (GValue *value,
463 guint32 gst_value_get_fourcc (const GValue *value);
466 void gst_value_set_int_range (GValue *value,
469 gint gst_value_get_int_range_min (const GValue *value);
470 gint gst_value_get_int_range_max (const GValue *value);
473 void gst_value_set_double_range (GValue *value,
476 gdouble gst_value_get_double_range_min (const GValue *value);
477 gdouble gst_value_get_double_range_max (const GValue *value);
480 G_CONST_RETURN GstCaps *
481 gst_value_get_caps (const GValue *value);
482 void gst_value_set_caps (GValue *value,
483 const GstCaps *caps);
486 G_CONST_RETURN GstStructure *
487 gst_value_get_structure (const GValue *value);
488 void gst_value_set_structure (GValue *value,
489 const GstStructure *structure);
492 void gst_value_set_fraction (GValue *value,
495 gint gst_value_get_fraction_numerator (const GValue *value);
496 gint gst_value_get_fraction_denominator(const GValue *value);
497 gboolean gst_value_fraction_multiply (GValue *product,
498 const GValue *factor1,
499 const GValue *factor2);
500 gboolean gst_value_fraction_subtract (GValue * dest,
501 const GValue * minuend,
502 const GValue * subtrahend);
505 void gst_value_set_fraction_range (GValue *value,
508 void gst_value_set_fraction_range_full (GValue *value,
509 gint numerator_start,
510 gint denominator_start,
512 gint denominator_end);
513 const GValue *gst_value_get_fraction_range_min (const GValue *value);
514 const GValue *gst_value_get_fraction_range_max (const GValue *value);
517 G_CONST_RETURN GDate *
518 gst_value_get_date (const GValue *value);
519 void gst_value_set_date (GValue *value,
523 gint gst_value_compare (const GValue *value1,
524 const GValue *value2);
525 gboolean gst_value_can_compare (const GValue *value1,
526 const GValue *value2);
528 gboolean gst_value_union (GValue *dest,
529 const GValue *value1,
530 const GValue *value2);
531 gboolean gst_value_can_union (const GValue *value1,
532 const GValue *value2);
533 void gst_value_register_union_func (GType type1,
535 GstValueUnionFunc func);
538 gboolean gst_value_intersect (GValue *dest,
539 const GValue *value1,
540 const GValue *value2);
541 gboolean gst_value_can_intersect (const GValue *value1,
542 const GValue *value2);
543 void gst_value_register_intersect_func (GType type1,
545 GstValueIntersectFunc func);
548 gboolean gst_value_subtract (GValue *dest,
549 const GValue *minuend,
550 const GValue *subtrahend);
551 gboolean gst_value_can_subtract (const GValue *minuend,
552 const GValue *subtrahend);
553 void gst_value_register_subtract_func (GType minuend_type,
554 GType subtrahend_type,
555 GstValueSubtractFunc func);
558 gboolean gst_value_is_fixed (const GValue *value);