2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
4 * 2002 Thomas Vander Stichele <thomas@apestaart.org>
6 * gstutils.c: Utility functions
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
26 * @short_description: Various utility functions
28 * When defining own plugins, use the GST_BOILERPLATE ease gobject creation.
31 #include "gst_private.h"
35 #include "gstghostpad.h"
41 #include "gst-i18n-lib.h"
46 * @mem: a pointer to the memory to dump
47 * @size: the size of the memory block to dump
49 * Dumps the memory block into a hex representation. Useful for debugging.
52 gst_util_dump_mem (const guchar * mem, guint size)
55 GString *string = g_string_sized_new (50);
56 GString *chars = g_string_sized_new (18);
60 if (g_ascii_isprint (mem[i]))
61 g_string_append_c (chars, mem[i]);
63 g_string_append_c (chars, '.');
65 g_string_append_printf (string, "%02x ", mem[i]);
70 if (j == 16 || i == size) {
71 g_print ("%08x (%p): %-48.48s %-16.16s\n", i - j, mem + i - j,
72 string->str, chars->str);
73 g_string_set_size (string, 0);
74 g_string_set_size (chars, 0);
78 g_string_free (string, TRUE);
79 g_string_free (chars, TRUE);
84 * gst_util_set_value_from_string:
85 * @value: the value to set
86 * @value_str: the string to get the value from
88 * Converts the string to the type of the value and
89 * sets the value with it.
91 * Note that this function is dangerous as it does not return any indication
92 * if the conversion worked or not.
95 gst_util_set_value_from_string (GValue * value, const gchar * value_str)
99 g_return_if_fail (value != NULL);
100 g_return_if_fail (value_str != NULL);
102 GST_CAT_DEBUG (GST_CAT_PARAMS, "parsing '%s' to type %s", value_str,
103 g_type_name (G_VALUE_TYPE (value)));
105 res = gst_value_deserialize (value, value_str);
106 if (!res && G_VALUE_TYPE (value) == G_TYPE_BOOLEAN) {
107 /* backwards compat, all booleans that fail to parse are false */
108 g_value_set_boolean (value, FALSE);
111 g_return_if_fail (res);
115 * gst_util_set_object_arg:
116 * @object: the object to set the argument of
117 * @name: the name of the argument to set
118 * @value: the string value to set
120 * Convertes the string value to the type of the objects argument and
121 * sets the argument with it.
123 * Note that this function silently returns if @object has no property named
124 * @name or when @value cannot be converted to the type of the property.
127 gst_util_set_object_arg (GObject * object, const gchar * name,
134 g_return_if_fail (G_IS_OBJECT (object));
135 g_return_if_fail (name != NULL);
136 g_return_if_fail (value != NULL);
138 pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (object), name);
142 value_type = pspec->value_type;
144 GST_DEBUG ("pspec->flags is %d, pspec->value_type is %s",
145 pspec->flags, g_type_name (value_type));
147 if (!(pspec->flags & G_PARAM_WRITABLE))
150 g_value_init (&v, value_type);
152 /* special case for element <-> xml (de)serialisation */
153 if (GST_VALUE_HOLDS_STRUCTURE (&v) && strcmp (value, "NULL") == 0) {
154 g_value_set_boxed (&v, NULL);
158 if (!gst_value_deserialize (&v, value))
163 g_object_set_property (object, pspec->name, &v);
167 /* work around error C2520: conversion from unsigned __int64 to double
168 * not implemented, use signed __int64
170 * These are implemented as functions because on some platforms a 64bit int to
171 * double conversion is not defined/implemented.
175 gst_util_guint64_to_gdouble (guint64 value)
177 if (value & G_GINT64_CONSTANT (0x8000000000000000))
178 return (gdouble) ((gint64) value) + (gdouble) 18446744073709551616.;
180 return (gdouble) ((gint64) value);
184 gst_util_gdouble_to_guint64 (gdouble value)
186 if (value < (gdouble) 9223372036854775808.) /* 1 << 63 */
187 return ((guint64) ((gint64) value));
189 value -= (gdouble) 18446744073709551616.;
190 return ((guint64) ((gint64) value));
193 #ifndef HAVE_UINT128_T
194 /* convenience struct for getting high and low uint32 parts of
201 #if G_BYTE_ORDER == G_BIG_ENDIAN
209 #if defined (__x86_64__) && defined (__GNUC__)
211 gst_util_uint64_mul_uint64 (GstUInt64 * c1, GstUInt64 * c0, guint64 arg1,
214 __asm__ __volatile__ ("mulq %3":"=a" (c0->ll), "=d" (c1->ll)
215 :"a" (arg1), "g" (arg2)
218 #else /* defined (__x86_64__) */
219 /* multiply two 64-bit unsigned ints into a 128-bit unsigned int. the high
220 * and low 64 bits of the product are placed in c1 and c0 respectively.
221 * this operation cannot overflow. */
223 gst_util_uint64_mul_uint64 (GstUInt64 * c1, GstUInt64 * c0, guint64 arg1,
233 /* do 128 bits multiply
241 * -------------------
244 * "a0" is optimized away, result is stored directly in c0. "b1" is
245 * optimized away, result is stored directly in c1.
247 c0->ll = (guint64) v.l.low * n.l.low;
248 a1.ll = (guint64) v.l.low * n.l.high;
249 b0.ll = (guint64) v.l.high * n.l.low;
251 /* add the high word of a0 to the low words of a1 and b0 using c1 as
252 * scrach space to capture the carry. the low word of the result becomes
253 * the final high word of c0 */
254 c1->ll = (guint64) c0->l.high + a1.l.low + b0.l.low;
255 c0->l.high = c1->l.low;
257 /* add the carry from the result above (found in the high word of c1) and
258 * the high words of a1 and b0 to b1, the result is c1. */
259 c1->ll = (guint64) v.l.high * n.l.high + c1->l.high + a1.l.high + b0.l.high;
261 #endif /* defined (__x86_64__) */
263 #if defined (__x86_64__) && defined (__GNUC__)
264 static inline guint64
265 gst_util_div128_64 (GstUInt64 c1, GstUInt64 c0, guint64 denom)
269 __asm__ __volatile__ ("divq %3":"=a" (res)
270 :"d" (c1.ll), "a" (c0.ll), "g" (denom)
276 /* count leading zeros */
278 gst_util_clz (guint32 val)
282 s = val | (val >> 1);
286 s = ~(s | (s >> 16));
287 s = s - ((s >> 1) & 0x55555555);
288 s = (s & 0x33333333) + ((s >> 2) & 0x33333333);
289 s = (s + (s >> 4)) & 0x0f0f0f0f;
291 s = (s + (s >> 16)) & 0x3f;
296 /* based on Hacker's Delight p152 */
297 static inline guint64
298 gst_util_div128_64 (GstUInt64 c1, GstUInt64 c0, guint64 denom)
300 GstUInt64 q1, q0, rhat;
301 GstUInt64 v, cmp1, cmp2;
306 /* count number of leading zeroes, we know they must be in the high
307 * part of denom since denom > G_MAXUINT32. */
308 s = gst_util_clz (v.l.high);
311 /* normalize divisor and dividend */
313 c1.ll = (c1.ll << s) | (c0.l.high >> (32 - s));
317 q1.ll = c1.ll / v.l.high;
318 rhat.ll = c1.ll - q1.ll * v.l.high;
320 cmp1.l.high = rhat.l.low;
321 cmp1.l.low = c0.l.high;
322 cmp2.ll = q1.ll * v.l.low;
324 while (q1.l.high || cmp2.ll > cmp1.ll) {
329 cmp1.l.high = rhat.l.low;
332 c1.l.high = c1.l.low;
333 c1.l.low = c0.l.high;
334 c1.ll -= q1.ll * v.ll;
335 q0.ll = c1.ll / v.l.high;
336 rhat.ll = c1.ll - q0.ll * v.l.high;
338 cmp1.l.high = rhat.l.low;
339 cmp1.l.low = c0.l.low;
340 cmp2.ll = q0.ll * v.l.low;
342 while (q0.l.high || cmp2.ll > cmp1.ll) {
347 cmp1.l.high = rhat.l.low;
350 q0.l.high += q1.l.low;
354 #endif /* defined (__GNUC__) */
356 /* This always gives the correct result because:
357 * a) val <= G_MAXUINT64-1
358 * b) (c0,c1) <= G_MAXUINT64 * (G_MAXUINT64-1)
360 * (c0,c1) == G_MAXUINT64 * G_MAXUINT64 and denom < G_MAXUINT64
361 * (note: num==denom case is handled by short path)
362 * This means that (c0,c1) either has enough space for val
363 * or that the overall result will overflow anyway.
366 /* add correction with carry */
367 #define CORRECT(c0,c1,val) \
369 if (G_MAXUINT64 - c0.ll < val) { \
370 if (G_UNLIKELY (c1.ll == G_MAXUINT64)) \
372 return G_MAXUINT64; \
379 gst_util_uint64_scale_uint64_unchecked (guint64 val, guint64 num,
380 guint64 denom, guint64 correct)
384 /* compute 128-bit numerator product */
385 gst_util_uint64_mul_uint64 (&c1, &c0, val, num);
387 /* perform rounding correction */
388 CORRECT (c0, c1, correct);
390 /* high word as big as or bigger than denom --> overflow */
391 if (G_UNLIKELY (c1.ll >= denom))
394 /* compute quotient, fits in 64 bits */
395 return gst_util_div128_64 (c1, c0, denom);
399 #define GST_MAXUINT128 ((__uint128_t) -1)
401 gst_util_uint64_scale_uint64_unchecked (guint64 val, guint64 num,
402 guint64 denom, guint64 correct)
406 /* Calculate val * num */
407 tmp = ((__uint128_t) val) * ((__uint128_t) num);
409 /* overflow checks */
410 if (G_UNLIKELY (GST_MAXUINT128 - correct < tmp))
413 /* perform rounding correction */
416 /* Divide by denom */
419 /* if larger than G_MAXUINT64 --> overflow */
420 if (G_UNLIKELY (tmp > G_MAXUINT64))
423 /* compute quotient, fits in 64 bits */
424 return (guint64) tmp;
429 #if !defined (__x86_64__) && !defined (HAVE_UINT128_T)
431 gst_util_uint64_mul_uint32 (GstUInt64 * c1, GstUInt64 * c0, guint64 arg1,
438 c0->ll = (guint64) a.l.low * arg2;
439 c1->ll = (guint64) a.l.high * arg2 + c0->l.high;
443 /* divide a 96-bit unsigned int by a 32-bit unsigned int when we know the
444 * quotient fits into 64 bits. the high 64 bits and low 32 bits of the
445 * numerator are expected in c1 and c0 respectively. */
446 static inline guint64
447 gst_util_div96_32 (guint64 c1, guint64 c0, guint32 denom)
449 c0 += (c1 % denom) << 32;
450 return ((c1 / denom) << 32) + (c0 / denom);
453 static inline guint64
454 gst_util_uint64_scale_uint32_unchecked (guint64 val, guint32 num,
455 guint32 denom, guint32 correct)
459 /* compute 96-bit numerator product */
460 gst_util_uint64_mul_uint32 (&c1, &c0, val, num);
462 /* condition numerator based on rounding mode */
463 CORRECT (c0, c1, correct);
465 /* high 32 bits as big as or bigger than denom --> overflow */
466 if (G_UNLIKELY (c1.l.high >= denom))
469 /* compute quotient, fits in 64 bits */
470 return gst_util_div96_32 (c1.ll, c0.ll, denom);
474 /* the guts of the gst_util_uint64_scale() variants */
476 _gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom,
479 g_return_val_if_fail (denom != 0, G_MAXUINT64);
481 if (G_UNLIKELY (num == 0))
484 if (G_UNLIKELY (num == denom))
487 /* on 64bits we always use a full 128bits multipy/division */
488 #if !defined (__x86_64__) && !defined (HAVE_UINT128_T)
489 /* denom is low --> try to use 96 bit muldiv */
490 if (G_LIKELY (denom <= G_MAXUINT32)) {
491 /* num is low --> use 96 bit muldiv */
492 if (G_LIKELY (num <= G_MAXUINT32))
493 return gst_util_uint64_scale_uint32_unchecked (val, (guint32) num,
494 (guint32) denom, correct);
496 /* num is high but val is low --> swap and use 96-bit muldiv */
497 if (G_LIKELY (val <= G_MAXUINT32))
498 return gst_util_uint64_scale_uint32_unchecked (num, (guint32) val,
499 (guint32) denom, correct);
501 #endif /* !defined (__x86_64__) && !defined (HAVE_UINT128_T) */
503 /* val is high and num is high --> use 128-bit muldiv */
504 return gst_util_uint64_scale_uint64_unchecked (val, num, denom, correct);
508 * gst_util_uint64_scale:
509 * @val: the number to scale
510 * @num: the numerator of the scale ratio
511 * @denom: the denominator of the scale ratio
513 * Scale @val by the rational number @num / @denom, avoiding overflows and
514 * underflows and without loss of precision.
516 * This function can potentially be very slow if val and num are both
517 * greater than G_MAXUINT32.
519 * Returns: @val * @num / @denom. In the case of an overflow, this
520 * function returns G_MAXUINT64. If the result is not exactly
521 * representable as an integer it is truncated. See also
522 * gst_util_uint64_scale_round(), gst_util_uint64_scale_ceil(),
523 * gst_util_uint64_scale_int(), gst_util_uint64_scale_int_round(),
524 * gst_util_uint64_scale_int_ceil().
527 gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom)
529 return _gst_util_uint64_scale (val, num, denom, 0);
533 * gst_util_uint64_scale_round:
534 * @val: the number to scale
535 * @num: the numerator of the scale ratio
536 * @denom: the denominator of the scale ratio
538 * Scale @val by the rational number @num / @denom, avoiding overflows and
539 * underflows and without loss of precision.
541 * This function can potentially be very slow if val and num are both
542 * greater than G_MAXUINT32.
544 * Returns: @val * @num / @denom. In the case of an overflow, this
545 * function returns G_MAXUINT64. If the result is not exactly
546 * representable as an integer, it is rounded to the nearest integer
547 * (half-way cases are rounded up). See also gst_util_uint64_scale(),
548 * gst_util_uint64_scale_ceil(), gst_util_uint64_scale_int(),
549 * gst_util_uint64_scale_int_round(), gst_util_uint64_scale_int_ceil().
552 gst_util_uint64_scale_round (guint64 val, guint64 num, guint64 denom)
554 return _gst_util_uint64_scale (val, num, denom, denom >> 1);
558 * gst_util_uint64_scale_ceil:
559 * @val: the number to scale
560 * @num: the numerator of the scale ratio
561 * @denom: the denominator of the scale ratio
563 * Scale @val by the rational number @num / @denom, avoiding overflows and
564 * underflows and without loss of precision.
566 * This function can potentially be very slow if val and num are both
567 * greater than G_MAXUINT32.
569 * Returns: @val * @num / @denom. In the case of an overflow, this
570 * function returns G_MAXUINT64. If the result is not exactly
571 * representable as an integer, it is rounded up. See also
572 * gst_util_uint64_scale(), gst_util_uint64_scale_round(),
573 * gst_util_uint64_scale_int(), gst_util_uint64_scale_int_round(),
574 * gst_util_uint64_scale_int_ceil().
577 gst_util_uint64_scale_ceil (guint64 val, guint64 num, guint64 denom)
579 return _gst_util_uint64_scale (val, num, denom, denom - 1);
582 /* the guts of the gst_util_uint64_scale_int() variants */
584 _gst_util_uint64_scale_int (guint64 val, gint num, gint denom, gint correct)
586 g_return_val_if_fail (denom > 0, G_MAXUINT64);
587 g_return_val_if_fail (num >= 0, G_MAXUINT64);
589 if (G_UNLIKELY (num == 0))
592 if (G_UNLIKELY (num == denom))
595 if (val <= G_MAXUINT32) {
596 /* simple case. num and denom are not negative so casts are OK. when
597 * not truncating, the additions to the numerator cannot overflow
598 * because val*num <= G_MAXUINT32 * G_MAXINT32 < G_MAXUINT64 -
599 * G_MAXINT32, so there's room to add another gint32. */
600 val *= (guint64) num;
601 /* add rounding correction */
604 return val / (guint64) denom;
606 #if !defined (__x86_64__) && !defined (HAVE_UINT128_T)
607 /* num and denom are not negative so casts are OK */
608 return gst_util_uint64_scale_uint32_unchecked (val, (guint32) num,
609 (guint32) denom, (guint32) correct);
611 /* always use full 128bits scale */
612 return gst_util_uint64_scale_uint64_unchecked (val, num, denom, correct);
617 * gst_util_uint64_scale_int:
618 * @val: guint64 (such as a #GstClockTime) to scale.
619 * @num: numerator of the scale factor.
620 * @denom: denominator of the scale factor.
622 * Scale @val by the rational number @num / @denom, avoiding overflows and
623 * underflows and without loss of precision. @num must be non-negative and
624 * @denom must be positive.
626 * Returns: @val * @num / @denom. In the case of an overflow, this
627 * function returns G_MAXUINT64. If the result is not exactly
628 * representable as an integer, it is truncated. See also
629 * gst_util_uint64_scale_int_round(), gst_util_uint64_scale_int_ceil(),
630 * gst_util_uint64_scale(), gst_util_uint64_scale_round(),
631 * gst_util_uint64_scale_ceil().
634 gst_util_uint64_scale_int (guint64 val, gint num, gint denom)
636 return _gst_util_uint64_scale_int (val, num, denom, 0);
640 * gst_util_uint64_scale_int_round:
641 * @val: guint64 (such as a #GstClockTime) to scale.
642 * @num: numerator of the scale factor.
643 * @denom: denominator of the scale factor.
645 * Scale @val by the rational number @num / @denom, avoiding overflows and
646 * underflows and without loss of precision. @num must be non-negative and
647 * @denom must be positive.
649 * Returns: @val * @num / @denom. In the case of an overflow, this
650 * function returns G_MAXUINT64. If the result is not exactly
651 * representable as an integer, it is rounded to the nearest integer
652 * (half-way cases are rounded up). See also gst_util_uint64_scale_int(),
653 * gst_util_uint64_scale_int_ceil(), gst_util_uint64_scale(),
654 * gst_util_uint64_scale_round(), gst_util_uint64_scale_ceil().
657 gst_util_uint64_scale_int_round (guint64 val, gint num, gint denom)
659 /* we can use a shift to divide by 2 because denom is required to be
661 return _gst_util_uint64_scale_int (val, num, denom, denom >> 1);
665 * gst_util_uint64_scale_int_ceil:
666 * @val: guint64 (such as a #GstClockTime) to scale.
667 * @num: numerator of the scale factor.
668 * @denom: denominator of the scale factor.
670 * Scale @val by the rational number @num / @denom, avoiding overflows and
671 * underflows and without loss of precision. @num must be non-negative and
672 * @denom must be positive.
674 * Returns: @val * @num / @denom. In the case of an overflow, this
675 * function returns G_MAXUINT64. If the result is not exactly
676 * representable as an integer, it is rounded up. See also
677 * gst_util_uint64_scale_int(), gst_util_uint64_scale_int_round(),
678 * gst_util_uint64_scale(), gst_util_uint64_scale_round(),
679 * gst_util_uint64_scale_ceil().
682 gst_util_uint64_scale_int_ceil (guint64 val, gint num, gint denom)
684 return _gst_util_uint64_scale_int (val, num, denom, denom - 1);
688 * gst_util_seqnum_next:
690 * Return a constantly incrementing sequence number.
692 * This function is used internally to GStreamer to be able to determine which
693 * events and messages are "the same". For example, elements may set the seqnum
694 * on a segment-done message to be the same as that of the last seek event, to
695 * indicate that event and the message correspond to the same segment.
697 * Returns: A constantly incrementing 32-bit unsigned integer, which might
698 * overflow back to 0 at some point. Use gst_util_seqnum_compare() to make sure
699 * you handle wraparound correctly.
704 gst_util_seqnum_next (void)
706 static gint counter = 0;
707 return g_atomic_int_exchange_and_add (&counter, 1);
711 * gst_util_seqnum_compare:
712 * @s1: A sequence number.
713 * @s2: Another sequence number.
715 * Compare two sequence numbers, handling wraparound.
717 * The current implementation just returns (gint32)(@s1 - @s2).
719 * Returns: A negative number if @s1 is before @s2, 0 if they are equal, or a
720 * positive number if @s1 is after @s2.
725 gst_util_seqnum_compare (guint32 s1, guint32 s2)
727 return (gint32) (s1 - s2);
730 /* -----------------------------------------------------
732 * The following code will be moved out of the main
733 * gstreamer library someday.
739 string_append_indent (GString * str, gint count)
743 for (xx = 0; xx < count; xx++)
744 g_string_append_c (str, ' ');
748 * gst_print_pad_caps:
749 * @buf: the buffer to print the caps in
750 * @indent: initial indentation
751 * @pad: the pad to print the caps from
753 * Write the pad capabilities in a human readable format into
757 gst_print_pad_caps (GString * buf, gint indent, GstPad * pad)
764 string_append_indent (buf, indent);
765 g_string_printf (buf, "%s:%s has no capabilities",
766 GST_DEBUG_PAD_NAME (pad));
770 s = gst_caps_to_string (caps);
771 g_string_append (buf, s);
777 * gst_print_element_args:
778 * @buf: the buffer to print the args in
779 * @indent: initial indentation
780 * @element: the element to print the args of
782 * Print the element argument in a human readable format in the given
786 gst_print_element_args (GString * buf, gint indent, GstElement * element)
789 GValue value = { 0, }; /* the important thing is that value.type = 0 */
791 GParamSpec *spec, **specs, **walk;
793 specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (element), NULL);
796 for (walk = specs; *walk; walk++) {
798 if (width < strlen (spec->name))
799 width = strlen (spec->name);
802 for (walk = specs; *walk; walk++) {
805 if (spec->flags & G_PARAM_READABLE) {
806 g_value_init (&value, spec->value_type);
807 g_object_get_property (G_OBJECT (element), spec->name, &value);
808 str = g_strdup_value_contents (&value);
809 g_value_unset (&value);
811 str = g_strdup ("Parameter not readable.");
814 string_append_indent (buf, indent);
815 g_string_append (buf, spec->name);
816 string_append_indent (buf, 2 + width - strlen (spec->name));
817 g_string_append (buf, str);
818 g_string_append_c (buf, '\n');
827 * gst_element_create_all_pads:
828 * @element: a #GstElement to create pads for
830 * Creates a pad for each pad template that is always available.
831 * This function is only useful during object intialization of
832 * subclasses of #GstElement.
835 gst_element_create_all_pads (GstElement * element)
839 /* FIXME: lock element */
842 gst_element_class_get_pad_template_list (GST_ELEMENT_CLASS
843 (G_OBJECT_GET_CLASS (element)));
846 GstPadTemplate *padtempl = (GstPadTemplate *) padlist->data;
848 if (padtempl->presence == GST_PAD_ALWAYS) {
851 pad = gst_pad_new_from_template (padtempl, padtempl->name_template);
853 gst_element_add_pad (element, pad);
855 padlist = padlist->next;
860 * gst_element_get_compatible_pad_template:
861 * @element: a #GstElement to get a compatible pad template for.
862 * @compattempl: the #GstPadTemplate to find a compatible template for.
864 * Retrieves a pad template from @element that is compatible with @compattempl.
865 * Pads from compatible templates can be linked together.
867 * Returns: a compatible #GstPadTemplate, or NULL if none was found. No
868 * unreferencing is necessary.
871 gst_element_get_compatible_pad_template (GstElement * element,
872 GstPadTemplate * compattempl)
874 GstPadTemplate *newtempl = NULL;
876 GstElementClass *class;
879 g_return_val_if_fail (element != NULL, NULL);
880 g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
881 g_return_val_if_fail (compattempl != NULL, NULL);
883 class = GST_ELEMENT_GET_CLASS (element);
885 padlist = gst_element_class_get_pad_template_list (class);
887 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
888 "Looking for a suitable pad template in %s out of %d templates...",
889 GST_ELEMENT_NAME (element), g_list_length (padlist));
892 GstPadTemplate *padtempl = (GstPadTemplate *) padlist->data;
896 * Check direction (must be opposite)
899 GST_CAT_LOG (GST_CAT_CAPS,
900 "checking pad template %s", padtempl->name_template);
901 if (padtempl->direction != compattempl->direction) {
902 GST_CAT_DEBUG (GST_CAT_CAPS,
903 "compatible direction: found %s pad template \"%s\"",
904 padtempl->direction == GST_PAD_SRC ? "src" : "sink",
905 padtempl->name_template);
907 GST_CAT_DEBUG (GST_CAT_CAPS,
908 "intersecting %" GST_PTR_FORMAT, GST_PAD_TEMPLATE_CAPS (compattempl));
909 GST_CAT_DEBUG (GST_CAT_CAPS,
910 "..and %" GST_PTR_FORMAT, GST_PAD_TEMPLATE_CAPS (padtempl));
912 compatible = gst_caps_can_intersect (GST_PAD_TEMPLATE_CAPS (compattempl),
913 GST_PAD_TEMPLATE_CAPS (padtempl));
915 GST_CAT_DEBUG (GST_CAT_CAPS, "caps are %scompatible",
916 (compatible ? "" : "not "));
924 padlist = g_list_next (padlist);
927 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
928 "Returning new pad template %p", newtempl);
930 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "No compatible pad template found");
936 gst_element_request_pad (GstElement * element, GstPadTemplate * templ,
939 GstPad *newpad = NULL;
940 GstElementClass *oclass;
942 oclass = GST_ELEMENT_GET_CLASS (element);
944 if (oclass->request_new_pad)
945 newpad = (oclass->request_new_pad) (element, templ, name);
948 gst_object_ref (newpad);
956 * gst_element_get_pad_from_template:
957 * @element: a #GstElement.
958 * @templ: a #GstPadTemplate belonging to @element.
960 * Gets a pad from @element described by @templ. If the presence of @templ is
961 * #GST_PAD_REQUEST, requests a new pad. Can return %NULL for #GST_PAD_SOMETIMES
964 * Returns: the #GstPad, or NULL if one could not be found or created.
967 gst_element_get_pad_from_template (GstElement * element, GstPadTemplate * templ)
970 GstPadPresence presence;
972 /* If this function is ever exported, we need check the validity of `element'
973 * and `templ', and to make sure the template actually belongs to the
976 presence = GST_PAD_TEMPLATE_PRESENCE (templ);
980 case GST_PAD_SOMETIMES:
981 ret = gst_element_get_static_pad (element, templ->name_template);
982 if (!ret && presence == GST_PAD_ALWAYS)
984 ("Element %s has an ALWAYS template %s, but no pad of the same name",
985 GST_OBJECT_NAME (element), templ->name_template);
988 case GST_PAD_REQUEST:
989 ret = gst_element_request_pad (element, templ, NULL);
997 * gst_element_request_compatible_pad:
998 * @element: a #GstElement.
999 * @templ: the #GstPadTemplate to which the new pad should be able to link.
1001 * Requests a pad from @element. The returned pad should be unlinked and
1002 * compatible with @templ. Might return an existing pad, or request a new one.
1004 * Returns: a #GstPad, or %NULL if one could not be found or created.
1007 gst_element_request_compatible_pad (GstElement * element,
1008 GstPadTemplate * templ)
1010 GstPadTemplate *templ_new;
1013 g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
1014 g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
1016 /* FIXME: should really loop through the templates, testing each for
1017 * compatibility and pad availability. */
1018 templ_new = gst_element_get_compatible_pad_template (element, templ);
1020 pad = gst_element_get_pad_from_template (element, templ_new);
1022 /* This can happen for non-request pads. No need to unref. */
1023 if (pad && GST_PAD_PEER (pad))
1030 * Checks if the source pad and the sink pad can be linked.
1031 * Both @srcpad and @sinkpad must be unlinked and have a parent.
1034 gst_pad_check_link (GstPad * srcpad, GstPad * sinkpad)
1036 /* FIXME This function is gross. It's almost a direct copy of
1037 * gst_pad_link_filtered(). Any decent programmer would attempt
1038 * to merge the two functions, which I will do some day. --ds
1041 /* generic checks */
1042 g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
1043 g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
1045 GST_CAT_INFO (GST_CAT_PADS, "trying to link %s:%s and %s:%s",
1046 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
1048 /* FIXME: shouldn't we convert this to g_return_val_if_fail? */
1049 if (GST_PAD_PEER (srcpad) != NULL) {
1050 GST_CAT_INFO (GST_CAT_PADS, "Source pad %s:%s has a peer, failed",
1051 GST_DEBUG_PAD_NAME (srcpad));
1054 if (GST_PAD_PEER (sinkpad) != NULL) {
1055 GST_CAT_INFO (GST_CAT_PADS, "Sink pad %s:%s has a peer, failed",
1056 GST_DEBUG_PAD_NAME (sinkpad));
1059 if (!GST_PAD_IS_SRC (srcpad)) {
1060 GST_CAT_INFO (GST_CAT_PADS, "Src pad %s:%s is not source pad, failed",
1061 GST_DEBUG_PAD_NAME (srcpad));
1064 if (!GST_PAD_IS_SINK (sinkpad)) {
1065 GST_CAT_INFO (GST_CAT_PADS, "Sink pad %s:%s is not sink pad, failed",
1066 GST_DEBUG_PAD_NAME (sinkpad));
1069 if (GST_PAD_PARENT (srcpad) == NULL) {
1070 GST_CAT_INFO (GST_CAT_PADS, "Src pad %s:%s has no parent, failed",
1071 GST_DEBUG_PAD_NAME (srcpad));
1074 if (GST_PAD_PARENT (sinkpad) == NULL) {
1075 GST_CAT_INFO (GST_CAT_PADS, "Sink pad %s:%s has no parent, failed",
1076 GST_DEBUG_PAD_NAME (srcpad));
1084 * gst_element_get_compatible_pad:
1085 * @element: a #GstElement in which the pad should be found.
1086 * @pad: the #GstPad to find a compatible one for.
1087 * @caps: the #GstCaps to use as a filter.
1089 * Looks for an unlinked pad to which the given pad can link. It is not
1090 * guaranteed that linking the pads will work, though it should work in most
1093 * This function will first attempt to find a compatible unlinked ALWAYS pad,
1094 * and if none can be found, it will request a compatible REQUEST pad by looking
1095 * at the templates of @element.
1097 * Returns: the #GstPad to which a link can be made, or %NULL if one cannot be
1098 * found. gst_object_unref() after usage.
1101 gst_element_get_compatible_pad (GstElement * element, GstPad * pad,
1102 const GstCaps * caps)
1105 GstPadTemplate *templ;
1107 GstPad *foundpad = NULL;
1110 g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
1111 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
1113 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
1114 "finding pad in %s compatible with %s:%s",
1115 GST_ELEMENT_NAME (element), GST_DEBUG_PAD_NAME (pad));
1117 g_return_val_if_fail (GST_PAD_PEER (pad) == NULL, NULL);
1121 /* try to get an existing unlinked pad */
1122 if (GST_PAD_IS_SRC (pad)) {
1123 pads = gst_element_iterate_sink_pads (element);
1124 } else if (GST_PAD_IS_SINK (pad)) {
1125 pads = gst_element_iterate_src_pads (element);
1127 pads = gst_element_iterate_pads (element);
1133 switch (gst_iterator_next (pads, &padptr)) {
1134 case GST_ITERATOR_OK:
1139 current = GST_PAD (padptr);
1141 GST_CAT_LOG (GST_CAT_ELEMENT_PADS, "examining pad %s:%s",
1142 GST_DEBUG_PAD_NAME (current));
1144 peer = gst_pad_get_peer (current);
1146 if (peer == NULL && gst_pad_check_link (pad, current)) {
1147 GstCaps *temp, *intersection;
1148 gboolean compatible;
1150 /* Now check if the two pads' caps are compatible */
1151 temp = gst_pad_get_caps_reffed (pad);
1153 intersection = gst_caps_intersect (temp, caps);
1154 gst_caps_unref (temp);
1156 intersection = temp;
1159 temp = gst_pad_get_caps_reffed (current);
1160 compatible = gst_caps_can_intersect (temp, intersection);
1161 gst_caps_unref (temp);
1162 gst_caps_unref (intersection);
1165 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
1166 "found existing unlinked compatible pad %s:%s",
1167 GST_DEBUG_PAD_NAME (current));
1168 gst_iterator_free (pads);
1172 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "incompatible pads");
1175 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
1176 "already linked or cannot be linked (peer = %p)", peer);
1178 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "unreffing pads");
1180 gst_object_unref (current);
1182 gst_object_unref (peer);
1185 case GST_ITERATOR_DONE:
1188 case GST_ITERATOR_RESYNC:
1189 gst_iterator_resync (pads);
1191 case GST_ITERATOR_ERROR:
1192 g_assert_not_reached ();
1196 gst_iterator_free (pads);
1198 GST_CAT_DEBUG_OBJECT (GST_CAT_ELEMENT_PADS, element,
1199 "Could not find a compatible unlinked always pad to link to %s:%s, now checking request pads",
1200 GST_DEBUG_PAD_NAME (pad));
1202 /* try to create a new one */
1203 /* requesting is a little crazy, we need a template. Let's create one */
1204 /* FIXME: why not gst_pad_get_pad_template (pad); */
1205 templcaps = gst_pad_get_caps_reffed (pad);
1207 templ = gst_pad_template_new ((gchar *) GST_PAD_NAME (pad),
1208 GST_PAD_DIRECTION (pad), GST_PAD_ALWAYS, templcaps);
1210 foundpad = gst_element_request_compatible_pad (element, templ);
1211 gst_object_unref (templ);
1214 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
1215 "found existing request pad %s:%s", GST_DEBUG_PAD_NAME (foundpad));
1219 GST_CAT_INFO_OBJECT (GST_CAT_ELEMENT_PADS, element,
1220 "Could not find a compatible pad to link to %s:%s",
1221 GST_DEBUG_PAD_NAME (pad));
1226 * gst_element_state_get_name:
1227 * @state: a #GstState to get the name of.
1229 * Gets a string representing the given state.
1231 * Returns: a string with the name of the state.
1233 G_CONST_RETURN gchar *
1234 gst_element_state_get_name (GstState state)
1237 #ifdef GST_DEBUG_COLOR
1238 case GST_STATE_VOID_PENDING:
1239 return "VOID_PENDING";
1240 case GST_STATE_NULL:
1241 return "\033[01;34mNULL\033[00m";
1242 case GST_STATE_READY:
1243 return "\033[01;31mREADY\033[00m";
1244 case GST_STATE_PLAYING:
1245 return "\033[01;32mPLAYING\033[00m";
1246 case GST_STATE_PAUSED:
1247 return "\033[01;33mPAUSED\033[00m";
1249 /* This is a memory leak */
1250 return g_strdup_printf ("\033[01;35;41mUNKNOWN!\033[00m(%d)", state);
1252 case GST_STATE_VOID_PENDING:
1253 return "VOID_PENDING";
1254 case GST_STATE_NULL:
1256 case GST_STATE_READY:
1258 case GST_STATE_PLAYING:
1260 case GST_STATE_PAUSED:
1263 /* This is a memory leak */
1264 return g_strdup_printf ("UNKNOWN!(%d)", state);
1270 * gst_element_state_change_return_get_name:
1271 * @state_ret: a #GstStateChangeReturn to get the name of.
1273 * Gets a string representing the given state change result.
1275 * Returns: a string with the name of the state change result.
1279 G_CONST_RETURN gchar *
1280 gst_element_state_change_return_get_name (GstStateChangeReturn state_ret)
1282 switch (state_ret) {
1283 #ifdef GST_DEBUG_COLOR
1284 case GST_STATE_CHANGE_FAILURE:
1285 return "\033[01;31mFAILURE\033[00m";
1286 case GST_STATE_CHANGE_SUCCESS:
1287 return "\033[01;32mSUCCESS\033[00m";
1288 case GST_STATE_CHANGE_ASYNC:
1289 return "\033[01;33mASYNC\033[00m";
1290 case GST_STATE_CHANGE_NO_PREROLL:
1291 return "\033[01;34mNO_PREROLL\033[00m";
1293 /* This is a memory leak */
1294 return g_strdup_printf ("\033[01;35;41mUNKNOWN!\033[00m(%d)", state_ret);
1296 case GST_STATE_CHANGE_FAILURE:
1298 case GST_STATE_CHANGE_SUCCESS:
1300 case GST_STATE_CHANGE_ASYNC:
1302 case GST_STATE_CHANGE_NO_PREROLL:
1303 return "NO PREROLL";
1305 /* This is a memory leak */
1306 return g_strdup_printf ("UNKNOWN!(%d)", state_ret);
1313 * gst_element_factory_can_src_caps:
1314 * @factory: factory to query
1315 * @caps: the caps to check
1317 * Checks if the factory can source the given capability.
1319 * Returns: true if it can src the capabilities
1322 gst_element_factory_can_src_caps (GstElementFactory * factory,
1323 const GstCaps * caps)
1327 g_return_val_if_fail (factory != NULL, FALSE);
1328 g_return_val_if_fail (caps != NULL, FALSE);
1330 templates = factory->staticpadtemplates;
1333 GstStaticPadTemplate *template = (GstStaticPadTemplate *) templates->data;
1335 if (template->direction == GST_PAD_SRC) {
1336 if (gst_caps_is_always_compatible (gst_static_caps_get
1337 (&template->static_caps), caps))
1340 templates = g_list_next (templates);
1347 * gst_element_factory_can_sink_caps:
1348 * @factory: factory to query
1349 * @caps: the caps to check
1351 * Checks if the factory can sink the given capability.
1353 * Returns: true if it can sink the capabilities
1356 gst_element_factory_can_sink_caps (GstElementFactory * factory,
1357 const GstCaps * caps)
1361 g_return_val_if_fail (factory != NULL, FALSE);
1362 g_return_val_if_fail (caps != NULL, FALSE);
1364 templates = factory->staticpadtemplates;
1367 GstStaticPadTemplate *template = (GstStaticPadTemplate *) templates->data;
1369 if (template->direction == GST_PAD_SINK) {
1370 if (gst_caps_is_always_compatible (caps,
1371 gst_static_caps_get (&template->static_caps)))
1374 templates = g_list_next (templates);
1381 /* if return val is true, *direct_child is a caller-owned ref on the direct
1382 * child of ancestor that is part of object's ancestry */
1384 object_has_ancestor (GstObject * object, GstObject * ancestor,
1385 GstObject ** direct_child)
1387 GstObject *child, *parent;
1390 *direct_child = NULL;
1392 child = gst_object_ref (object);
1393 parent = gst_object_get_parent (object);
1396 if (ancestor == parent) {
1398 *direct_child = child;
1400 gst_object_unref (child);
1401 gst_object_unref (parent);
1405 gst_object_unref (child);
1407 parent = gst_object_get_parent (parent);
1410 gst_object_unref (child);
1415 /* caller owns return */
1417 find_common_root (GstObject * o1, GstObject * o2)
1419 GstObject *top = o1;
1420 GstObject *kid1, *kid2;
1421 GstObject *root = NULL;
1423 while (GST_OBJECT_PARENT (top))
1424 top = GST_OBJECT_PARENT (top);
1426 /* the itsy-bitsy spider... */
1428 if (!object_has_ancestor (o2, top, &kid2))
1431 root = gst_object_ref (top);
1433 if (!object_has_ancestor (o1, kid2, &kid1)) {
1434 gst_object_unref (kid2);
1438 if (!object_has_ancestor (o2, kid1, &kid2)) {
1439 gst_object_unref (kid1);
1446 /* caller does not own return */
1448 ghost_up (GstElement * e, GstPad * pad)
1450 static gint ghost_pad_index = 0;
1455 GstObject *parent = GST_OBJECT_PARENT (e);
1457 name = g_strdup_printf ("ghost%d", ghost_pad_index++);
1458 gpad = gst_ghost_pad_new (name, pad);
1462 gst_element_get_state (e, ¤t, &next, 0);
1464 if (current > GST_STATE_READY || next == GST_STATE_PAUSED)
1465 gst_pad_set_active (gpad, TRUE);
1467 if (!gst_element_add_pad ((GstElement *) parent, gpad)) {
1468 g_warning ("Pad named %s already exists in element %s\n",
1469 GST_OBJECT_NAME (gpad), GST_OBJECT_NAME (parent));
1470 gst_object_unref ((GstObject *) gpad);
1471 GST_STATE_UNLOCK (e);
1474 GST_STATE_UNLOCK (e);
1480 remove_pad (gpointer ppad, gpointer unused)
1484 if (!gst_element_remove_pad ((GstElement *) GST_OBJECT_PARENT (pad), pad))
1485 g_warning ("Couldn't remove pad %s from element %s",
1486 GST_OBJECT_NAME (pad), GST_OBJECT_NAME (GST_OBJECT_PARENT (pad)));
1490 prepare_link_maybe_ghosting (GstPad ** src, GstPad ** sink,
1491 GSList ** pads_created)
1495 GSList *pads_created_local = NULL;
1497 g_assert (pads_created);
1499 e1 = GST_OBJECT_PARENT (*src);
1500 e2 = GST_OBJECT_PARENT (*sink);
1502 if (G_UNLIKELY (e1 == NULL)) {
1503 GST_WARNING ("Trying to ghost a pad that doesn't have a parent: %"
1504 GST_PTR_FORMAT, *src);
1507 if (G_UNLIKELY (e2 == NULL)) {
1508 GST_WARNING ("Trying to ghost a pad that doesn't have a parent: %"
1509 GST_PTR_FORMAT, *sink);
1513 if (GST_OBJECT_PARENT (e1) == GST_OBJECT_PARENT (e2)) {
1514 GST_CAT_INFO (GST_CAT_PADS, "%s and %s in same bin, no need for ghost pads",
1515 GST_OBJECT_NAME (e1), GST_OBJECT_NAME (e2));
1519 GST_CAT_INFO (GST_CAT_PADS, "%s and %s not in same bin, making ghost pads",
1520 GST_OBJECT_NAME (e1), GST_OBJECT_NAME (e2));
1522 /* we need to setup some ghost pads */
1523 root = find_common_root (e1, e2);
1525 g_warning ("Trying to connect elements that don't share a common "
1526 "ancestor: %s and %s", GST_ELEMENT_NAME (e1), GST_ELEMENT_NAME (e2));
1530 while (GST_OBJECT_PARENT (e1) != root) {
1531 *src = ghost_up ((GstElement *) e1, *src);
1534 e1 = GST_OBJECT_PARENT (*src);
1535 pads_created_local = g_slist_prepend (pads_created_local, *src);
1537 while (GST_OBJECT_PARENT (e2) != root) {
1538 *sink = ghost_up ((GstElement *) e2, *sink);
1541 e2 = GST_OBJECT_PARENT (*sink);
1542 pads_created_local = g_slist_prepend (pads_created_local, *sink);
1545 gst_object_unref (root);
1546 *pads_created = g_slist_concat (*pads_created, pads_created_local);
1550 gst_object_unref (root);
1551 g_slist_foreach (pads_created_local, remove_pad, NULL);
1552 g_slist_free (pads_created_local);
1557 pad_link_maybe_ghosting (GstPad * src, GstPad * sink, GstPadLinkCheck flags)
1559 GSList *pads_created = NULL;
1562 if (!prepare_link_maybe_ghosting (&src, &sink, &pads_created)) {
1565 ret = (gst_pad_link_full (src, sink, flags) == GST_PAD_LINK_OK);
1569 g_slist_foreach (pads_created, remove_pad, NULL);
1571 g_slist_free (pads_created);
1577 * gst_element_link_pads_full:
1578 * @src: a #GstElement containing the source pad.
1579 * @srcpadname: the name of the #GstPad in source element or NULL for any pad.
1580 * @dest: the #GstElement containing the destination pad.
1581 * @destpadname: the name of the #GstPad in destination element,
1582 * or NULL for any pad.
1583 * @flags: the #GstPadLinkCheck to be performed when linking pads.
1585 * Links the two named pads of the source and destination elements.
1586 * Side effect is that if one of the pads has no parent, it becomes a
1587 * child of the parent of the other element. If they have different
1588 * parents, the link fails.
1590 * Calling gst_element_link_pads_full() with @flags == %GST_PAD_LINK_CHECK_DEFAULT
1591 * is the same as calling gst_element_link_pads() and the recommended way of
1592 * linking pads with safety checks applied.
1594 * Returns: TRUE if the pads could be linked, FALSE otherwise.
1599 gst_element_link_pads_full (GstElement * src, const gchar * srcpadname,
1600 GstElement * dest, const gchar * destpadname, GstPadLinkCheck flags)
1602 const GList *srcpads, *destpads, *srctempls, *desttempls, *l;
1603 GstPad *srcpad, *destpad;
1604 GstPadTemplate *srctempl, *desttempl;
1605 GstElementClass *srcclass, *destclass;
1608 g_return_val_if_fail (GST_IS_ELEMENT (src), FALSE);
1609 g_return_val_if_fail (GST_IS_ELEMENT (dest), FALSE);
1611 GST_CAT_INFO (GST_CAT_ELEMENT_PADS,
1612 "trying to link element %s:%s to element %s:%s", GST_ELEMENT_NAME (src),
1613 srcpadname ? srcpadname : "(any)", GST_ELEMENT_NAME (dest),
1614 destpadname ? destpadname : "(any)");
1618 /* name specified, look it up */
1619 if (!(srcpad = gst_element_get_static_pad (src, srcpadname)))
1620 srcpad = gst_element_get_request_pad (src, srcpadname);
1622 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no pad %s:%s",
1623 GST_ELEMENT_NAME (src), srcpadname);
1626 if (!(GST_PAD_DIRECTION (srcpad) == GST_PAD_SRC)) {
1627 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is no src pad",
1628 GST_DEBUG_PAD_NAME (srcpad));
1629 gst_object_unref (srcpad);
1632 if (GST_PAD_PEER (srcpad) != NULL) {
1633 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is already linked",
1634 GST_DEBUG_PAD_NAME (srcpad));
1635 gst_object_unref (srcpad);
1641 /* no name given, get the first available pad */
1642 GST_OBJECT_LOCK (src);
1643 srcpads = GST_ELEMENT_PADS (src);
1644 srcpad = srcpads ? GST_PAD_CAST (srcpads->data) : NULL;
1646 gst_object_ref (srcpad);
1647 GST_OBJECT_UNLOCK (src);
1650 /* get a destination pad */
1652 /* name specified, look it up */
1653 if (!(destpad = gst_element_get_static_pad (dest, destpadname)))
1654 destpad = gst_element_get_request_pad (dest, destpadname);
1656 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no pad %s:%s",
1657 GST_ELEMENT_NAME (dest), destpadname);
1660 if (!(GST_PAD_DIRECTION (destpad) == GST_PAD_SINK)) {
1661 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is no sink pad",
1662 GST_DEBUG_PAD_NAME (destpad));
1663 gst_object_unref (destpad);
1666 if (GST_PAD_PEER (destpad) != NULL) {
1667 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is already linked",
1668 GST_DEBUG_PAD_NAME (destpad));
1669 gst_object_unref (destpad);
1675 /* no name given, get the first available pad */
1676 GST_OBJECT_LOCK (dest);
1677 destpads = GST_ELEMENT_PADS (dest);
1678 destpad = destpads ? GST_PAD_CAST (destpads->data) : NULL;
1680 gst_object_ref (destpad);
1681 GST_OBJECT_UNLOCK (dest);
1684 if (srcpadname && destpadname) {
1687 /* two explicitly specified pads */
1688 result = pad_link_maybe_ghosting (srcpad, destpad, flags);
1690 gst_object_unref (srcpad);
1691 gst_object_unref (destpad);
1697 /* loop through the allowed pads in the source, trying to find a
1698 * compatible destination pad */
1699 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
1700 "looping through allowed src and dest pads");
1702 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "trying src pad %s:%s",
1703 GST_DEBUG_PAD_NAME (srcpad));
1704 if ((GST_PAD_DIRECTION (srcpad) == GST_PAD_SRC) &&
1705 (GST_PAD_PEER (srcpad) == NULL)) {
1710 gst_object_ref (temp);
1712 temp = gst_element_get_compatible_pad (dest, srcpad, NULL);
1715 if (temp && pad_link_maybe_ghosting (srcpad, temp, flags)) {
1716 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "linked pad %s:%s to pad %s:%s",
1717 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (temp));
1719 gst_object_unref (destpad);
1720 gst_object_unref (srcpad);
1721 gst_object_unref (temp);
1726 gst_object_unref (temp);
1729 /* find a better way for this mess */
1731 srcpads = g_list_next (srcpads);
1733 gst_object_unref (srcpad);
1734 srcpad = GST_PAD_CAST (srcpads->data);
1735 gst_object_ref (srcpad);
1741 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no link possible from %s:%s to %s",
1742 GST_DEBUG_PAD_NAME (srcpad), GST_ELEMENT_NAME (dest));
1744 gst_object_unref (destpad);
1748 gst_object_unref (srcpad);
1752 /* loop through the existing pads in the destination */
1754 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "trying dest pad %s:%s",
1755 GST_DEBUG_PAD_NAME (destpad));
1756 if ((GST_PAD_DIRECTION (destpad) == GST_PAD_SINK) &&
1757 (GST_PAD_PEER (destpad) == NULL)) {
1758 GstPad *temp = gst_element_get_compatible_pad (src, destpad, NULL);
1760 if (temp && pad_link_maybe_ghosting (temp, destpad, flags)) {
1761 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "linked pad %s:%s to pad %s:%s",
1762 GST_DEBUG_PAD_NAME (temp), GST_DEBUG_PAD_NAME (destpad));
1763 gst_object_unref (temp);
1764 gst_object_unref (destpad);
1768 gst_object_unref (temp);
1772 destpads = g_list_next (destpads);
1774 gst_object_unref (destpad);
1775 destpad = GST_PAD_CAST (destpads->data);
1776 gst_object_ref (destpad);
1783 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no link possible from %s to %s:%s",
1784 GST_ELEMENT_NAME (src), GST_DEBUG_PAD_NAME (destpad));
1785 gst_object_unref (destpad);
1789 gst_object_unref (destpad);
1793 srcclass = GST_ELEMENT_GET_CLASS (src);
1794 destclass = GST_ELEMENT_GET_CLASS (dest);
1796 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
1797 "we might have request pads on both sides, checking...");
1798 srctempls = gst_element_class_get_pad_template_list (srcclass);
1799 desttempls = gst_element_class_get_pad_template_list (destclass);
1801 if (srctempls && desttempls) {
1803 srctempl = (GstPadTemplate *) srctempls->data;
1804 if (srctempl->presence == GST_PAD_REQUEST) {
1805 for (l = desttempls; l; l = l->next) {
1806 desttempl = (GstPadTemplate *) l->data;
1807 if (desttempl->presence == GST_PAD_REQUEST &&
1808 desttempl->direction != srctempl->direction) {
1809 if (gst_caps_is_always_compatible (gst_pad_template_get_caps
1810 (srctempl), gst_pad_template_get_caps (desttempl))) {
1812 gst_element_get_request_pad (src, srctempl->name_template);
1814 gst_element_get_request_pad (dest, desttempl->name_template);
1815 if (srcpad && destpad
1816 && pad_link_maybe_ghosting (srcpad, destpad, flags)) {
1817 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
1818 "linked pad %s:%s to pad %s:%s",
1819 GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
1820 gst_object_unref (srcpad);
1821 gst_object_unref (destpad);
1824 /* it failed, so we release the request pads */
1826 gst_element_release_request_pad (src, srcpad);
1828 gst_element_release_request_pad (dest, destpad);
1833 srctempls = srctempls->next;
1837 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no link possible from %s to %s",
1838 GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (dest));
1843 * gst_element_link_pads:
1844 * @src: a #GstElement containing the source pad.
1845 * @srcpadname: the name of the #GstPad in source element or NULL for any pad.
1846 * @dest: the #GstElement containing the destination pad.
1847 * @destpadname: the name of the #GstPad in destination element,
1848 * or NULL for any pad.
1850 * Links the two named pads of the source and destination elements.
1851 * Side effect is that if one of the pads has no parent, it becomes a
1852 * child of the parent of the other element. If they have different
1853 * parents, the link fails.
1855 * Returns: TRUE if the pads could be linked, FALSE otherwise.
1858 gst_element_link_pads (GstElement * src, const gchar * srcpadname,
1859 GstElement * dest, const gchar * destpadname)
1861 return gst_element_link_pads_full (src, srcpadname, dest, destpadname,
1862 GST_PAD_LINK_CHECK_DEFAULT);
1866 * gst_element_link_pads_filtered:
1867 * @src: a #GstElement containing the source pad.
1868 * @srcpadname: the name of the #GstPad in source element or NULL for any pad.
1869 * @dest: the #GstElement containing the destination pad.
1870 * @destpadname: the name of the #GstPad in destination element or NULL for any pad.
1871 * @filter: the #GstCaps to filter the link, or #NULL for no filter.
1873 * Links the two named pads of the source and destination elements. Side effect
1874 * is that if one of the pads has no parent, it becomes a child of the parent of
1875 * the other element. If they have different parents, the link fails. If @caps
1876 * is not #NULL, makes sure that the caps of the link is a subset of @caps.
1878 * Returns: TRUE if the pads could be linked, FALSE otherwise.
1881 gst_element_link_pads_filtered (GstElement * src, const gchar * srcpadname,
1882 GstElement * dest, const gchar * destpadname, GstCaps * filter)
1885 g_return_val_if_fail (GST_IS_ELEMENT (src), FALSE);
1886 g_return_val_if_fail (GST_IS_ELEMENT (dest), FALSE);
1887 g_return_val_if_fail (filter == NULL || GST_IS_CAPS (filter), FALSE);
1890 GstElement *capsfilter;
1892 GstState state, pending;
1895 capsfilter = gst_element_factory_make ("capsfilter", NULL);
1897 GST_ERROR ("Could not make a capsfilter");
1901 parent = gst_object_get_parent (GST_OBJECT (src));
1902 g_return_val_if_fail (GST_IS_BIN (parent), FALSE);
1904 gst_element_get_state (GST_ELEMENT_CAST (parent), &state, &pending, 0);
1906 if (!gst_bin_add (GST_BIN (parent), capsfilter)) {
1907 GST_ERROR ("Could not add capsfilter");
1908 gst_object_unref (capsfilter);
1909 gst_object_unref (parent);
1913 if (pending != GST_STATE_VOID_PENDING)
1916 gst_element_set_state (capsfilter, state);
1918 gst_object_unref (parent);
1920 g_object_set (capsfilter, "caps", filter, NULL);
1922 lr1 = gst_element_link_pads (src, srcpadname, capsfilter, "sink");
1923 lr2 = gst_element_link_pads (capsfilter, "src", dest, destpadname);
1928 GST_INFO ("Could not link pads: %s:%s - capsfilter:sink",
1929 GST_ELEMENT_NAME (src), srcpadname);
1931 GST_INFO ("Could not link pads: capsfilter:src - %s:%s",
1932 GST_ELEMENT_NAME (dest), destpadname);
1934 gst_element_set_state (capsfilter, GST_STATE_NULL);
1935 /* this will unlink and unref as appropriate */
1936 gst_bin_remove (GST_BIN (GST_OBJECT_PARENT (capsfilter)), capsfilter);
1940 if (gst_element_link_pads (src, srcpadname, dest, destpadname)) {
1943 GST_INFO ("Could not link pads: %s:%s - %s:%s", GST_ELEMENT_NAME (src),
1944 srcpadname, GST_ELEMENT_NAME (dest), destpadname);
1952 * @src: a #GstElement containing the source pad.
1953 * @dest: the #GstElement containing the destination pad.
1955 * Links @src to @dest. The link must be from source to
1956 * destination; the other direction will not be tried. The function looks for
1957 * existing pads that aren't linked yet. It will request new pads if necessary.
1958 * Such pads need to be released manualy when unlinking.
1959 * If multiple links are possible, only one is established.
1961 * Make sure you have added your elements to a bin or pipeline with
1962 * gst_bin_add() before trying to link them.
1964 * Returns: TRUE if the elements could be linked, FALSE otherwise.
1967 gst_element_link (GstElement * src, GstElement * dest)
1969 return gst_element_link_pads (src, NULL, dest, NULL);
1973 * gst_element_link_many:
1974 * @element_1: the first #GstElement in the link chain.
1975 * @element_2: the second #GstElement in the link chain.
1976 * @...: the NULL-terminated list of elements to link in order.
1978 * Chain together a series of elements. Uses gst_element_link().
1979 * Make sure you have added your elements to a bin or pipeline with
1980 * gst_bin_add() before trying to link them.
1982 * Returns: TRUE on success, FALSE otherwise.
1985 gst_element_link_many (GstElement * element_1, GstElement * element_2, ...)
1987 gboolean res = TRUE;
1990 g_return_val_if_fail (GST_IS_ELEMENT (element_1), FALSE);
1991 g_return_val_if_fail (GST_IS_ELEMENT (element_2), FALSE);
1993 va_start (args, element_2);
1996 if (!gst_element_link (element_1, element_2)) {
2001 element_1 = element_2;
2002 element_2 = va_arg (args, GstElement *);
2011 * gst_element_link_filtered:
2012 * @src: a #GstElement containing the source pad.
2013 * @dest: the #GstElement containing the destination pad.
2014 * @filter: the #GstCaps to filter the link, or #NULL for no filter.
2016 * Links @src to @dest using the given caps as filtercaps.
2017 * The link must be from source to
2018 * destination; the other direction will not be tried. The function looks for
2019 * existing pads that aren't linked yet. It will request new pads if necessary.
2020 * If multiple links are possible, only one is established.
2022 * Make sure you have added your elements to a bin or pipeline with
2023 * gst_bin_add() before trying to link them.
2025 * Returns: TRUE if the pads could be linked, FALSE otherwise.
2028 gst_element_link_filtered (GstElement * src, GstElement * dest,
2031 return gst_element_link_pads_filtered (src, NULL, dest, NULL, filter);
2035 * gst_element_unlink_pads:
2036 * @src: a #GstElement containing the source pad.
2037 * @srcpadname: the name of the #GstPad in source element.
2038 * @dest: a #GstElement containing the destination pad.
2039 * @destpadname: the name of the #GstPad in destination element.
2041 * Unlinks the two named pads of the source and destination elements.
2044 gst_element_unlink_pads (GstElement * src, const gchar * srcpadname,
2045 GstElement * dest, const gchar * destpadname)
2047 GstPad *srcpad, *destpad;
2048 gboolean srcrequest, destrequest;
2050 srcrequest = destrequest = FALSE;
2052 g_return_if_fail (src != NULL);
2053 g_return_if_fail (GST_IS_ELEMENT (src));
2054 g_return_if_fail (srcpadname != NULL);
2055 g_return_if_fail (dest != NULL);
2056 g_return_if_fail (GST_IS_ELEMENT (dest));
2057 g_return_if_fail (destpadname != NULL);
2059 /* obtain the pads requested */
2060 if (!(srcpad = gst_element_get_static_pad (src, srcpadname)))
2061 if ((srcpad = gst_element_get_request_pad (src, srcpadname)))
2063 if (srcpad == NULL) {
2064 GST_WARNING_OBJECT (src, "source element has no pad \"%s\"", srcpadname);
2067 if (!(destpad = gst_element_get_static_pad (dest, destpadname)))
2068 if ((destpad = gst_element_get_request_pad (dest, destpadname)))
2070 if (destpad == NULL) {
2071 GST_WARNING_OBJECT (dest, "destination element has no pad \"%s\"",
2076 /* we're satisified they can be unlinked, let's do it */
2077 gst_pad_unlink (srcpad, destpad);
2080 gst_element_release_request_pad (dest, destpad);
2081 gst_object_unref (destpad);
2085 gst_element_release_request_pad (src, srcpad);
2086 gst_object_unref (srcpad);
2090 * gst_element_unlink_many:
2091 * @element_1: the first #GstElement in the link chain.
2092 * @element_2: the second #GstElement in the link chain.
2093 * @...: the NULL-terminated list of elements to unlink in order.
2095 * Unlinks a series of elements. Uses gst_element_unlink().
2098 gst_element_unlink_many (GstElement * element_1, GstElement * element_2, ...)
2102 g_return_if_fail (element_1 != NULL && element_2 != NULL);
2103 g_return_if_fail (GST_IS_ELEMENT (element_1) && GST_IS_ELEMENT (element_2));
2105 va_start (args, element_2);
2108 gst_element_unlink (element_1, element_2);
2110 element_1 = element_2;
2111 element_2 = va_arg (args, GstElement *);
2118 * gst_element_unlink:
2119 * @src: the source #GstElement to unlink.
2120 * @dest: the sink #GstElement to unlink.
2122 * Unlinks all source pads of the source element with all sink pads
2123 * of the sink element to which they are linked.
2125 * If the link has been made using gst_element_link(), it could have created an
2126 * requestpad, which has to be released using gst_element_release_request_pad().
2129 gst_element_unlink (GstElement * src, GstElement * dest)
2132 gboolean done = FALSE;
2134 g_return_if_fail (GST_IS_ELEMENT (src));
2135 g_return_if_fail (GST_IS_ELEMENT (dest));
2137 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "unlinking \"%s\" and \"%s\"",
2138 GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (dest));
2140 pads = gst_element_iterate_pads (src);
2144 switch (gst_iterator_next (pads, &data)) {
2145 case GST_ITERATOR_OK:
2147 GstPad *pad = GST_PAD_CAST (data);
2149 if (GST_PAD_IS_SRC (pad)) {
2150 GstPad *peerpad = gst_pad_get_peer (pad);
2152 /* see if the pad is linked and is really a pad of dest */
2154 GstElement *peerelem;
2156 peerelem = gst_pad_get_parent_element (peerpad);
2158 if (peerelem == dest) {
2159 gst_pad_unlink (pad, peerpad);
2162 gst_object_unref (peerelem);
2164 gst_object_unref (peerpad);
2167 gst_object_unref (pad);
2170 case GST_ITERATOR_RESYNC:
2171 gst_iterator_resync (pads);
2173 case GST_ITERATOR_DONE:
2177 g_assert_not_reached ();
2181 gst_iterator_free (pads);
2185 * gst_element_query_position:
2186 * @element: a #GstElement to invoke the position query on.
2187 * @format: a pointer to the #GstFormat asked for.
2188 * On return contains the #GstFormat used.
2189 * @cur: A location in which to store the current position, or NULL.
2191 * Queries an element for the stream position.
2193 * Returns: TRUE if the query could be performed.
2196 gst_element_query_position (GstElement * element, GstFormat * format,
2202 g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
2203 g_return_val_if_fail (format != NULL, FALSE);
2205 query = gst_query_new_position (*format);
2206 ret = gst_element_query (element, query);
2209 gst_query_parse_position (query, format, cur);
2211 gst_query_unref (query);
2217 * gst_element_query_duration:
2218 * @element: a #GstElement to invoke the duration query on.
2219 * @format: (inout): a pointer to the #GstFormat asked for.
2220 * On return contains the #GstFormat used.
2221 * @duration: (out): A location in which to store the total duration, or NULL.
2223 * Queries an element for the total stream duration.
2225 * Returns: TRUE if the query could be performed.
2228 gst_element_query_duration (GstElement * element, GstFormat * format,
2234 g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
2235 g_return_val_if_fail (format != NULL, FALSE);
2237 query = gst_query_new_duration (*format);
2238 ret = gst_element_query (element, query);
2241 gst_query_parse_duration (query, format, duration);
2243 gst_query_unref (query);
2249 * gst_element_query_convert:
2250 * @element: a #GstElement to invoke the convert query on.
2251 * @src_format: a #GstFormat to convert from.
2252 * @src_val: a value to convert.
2253 * @dest_format: a pointer to the #GstFormat to convert to.
2254 * @dest_val: a pointer to the result.
2256 * Queries an element to convert @src_val in @src_format to @dest_format.
2258 * Returns: TRUE if the query could be performed.
2261 gst_element_query_convert (GstElement * element, GstFormat src_format,
2262 gint64 src_val, GstFormat * dest_format, gint64 * dest_val)
2267 g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
2268 g_return_val_if_fail (dest_format != NULL, FALSE);
2269 g_return_val_if_fail (dest_val != NULL, FALSE);
2271 if (*dest_format == src_format || src_val == -1) {
2272 *dest_val = src_val;
2276 query = gst_query_new_convert (src_format, src_val, *dest_format);
2277 ret = gst_element_query (element, query);
2280 gst_query_parse_convert (query, NULL, NULL, dest_format, dest_val);
2282 gst_query_unref (query);
2288 * gst_element_seek_simple
2289 * @element: a #GstElement to seek on
2290 * @format: a #GstFormat to execute the seek in, such as #GST_FORMAT_TIME
2291 * @seek_flags: seek options; playback applications will usually want to use
2292 * GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT here
2293 * @seek_pos: position to seek to (relative to the start); if you are doing
2294 * a seek in #GST_FORMAT_TIME this value is in nanoseconds -
2295 * multiply with #GST_SECOND to convert seconds to nanoseconds or
2296 * with #GST_MSECOND to convert milliseconds to nanoseconds.
2298 * Simple API to perform a seek on the given element, meaning it just seeks
2299 * to the given position relative to the start of the stream. For more complex
2300 * operations like segment seeks (e.g. for looping) or changing the playback
2301 * rate or seeking relative to the last configured playback segment you should
2302 * use gst_element_seek().
2304 * In a completely prerolled PAUSED or PLAYING pipeline, seeking is always
2305 * guaranteed to return %TRUE on a seekable media type or %FALSE when the media
2306 * type is certainly not seekable (such as a live stream).
2308 * Some elements allow for seeking in the READY state, in this
2309 * case they will store the seek event and execute it when they are put to
2310 * PAUSED. If the element supports seek in READY, it will always return %TRUE when
2311 * it receives the event in the READY state.
2313 * Returns: %TRUE if the seek operation succeeded (the seek might not always be
2314 * executed instantly though)
2319 gst_element_seek_simple (GstElement * element, GstFormat format,
2320 GstSeekFlags seek_flags, gint64 seek_pos)
2322 g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
2323 g_return_val_if_fail (seek_pos >= 0, FALSE);
2325 return gst_element_seek (element, 1.0, format, seek_flags,
2326 GST_SEEK_TYPE_SET, seek_pos, GST_SEEK_TYPE_NONE, 0);
2330 * gst_pad_use_fixed_caps:
2331 * @pad: the pad to use
2333 * A helper function you can use that sets the
2334 * @gst_pad_get_fixed_caps_func as the getcaps function for the
2335 * pad. This way the function will always return the negotiated caps
2336 * or in case the pad is not negotiated, the padtemplate caps.
2338 * Use this function on a pad that, once gst_pad_set_caps() has been called
2339 * on it, cannot be renegotiated to something else.
2342 gst_pad_use_fixed_caps (GstPad * pad)
2344 gst_pad_set_getcaps_function (pad, gst_pad_get_fixed_caps_func);
2348 * gst_pad_get_fixed_caps_func:
2349 * @pad: the pad to use
2351 * A helper function you can use as a GetCaps function that
2352 * will return the currently negotiated caps or the padtemplate
2355 * Returns: The currently negotiated caps or the padtemplate.
2358 gst_pad_get_fixed_caps_func (GstPad * pad)
2362 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2364 GST_OBJECT_LOCK (pad);
2365 if (GST_PAD_CAPS (pad)) {
2366 result = GST_PAD_CAPS (pad);
2368 GST_CAT_DEBUG (GST_CAT_CAPS,
2369 "using pad caps %p %" GST_PTR_FORMAT, result, result);
2371 result = gst_caps_ref (result);
2372 } else if (GST_PAD_PAD_TEMPLATE (pad)) {
2373 GstPadTemplate *templ = GST_PAD_PAD_TEMPLATE (pad);
2375 result = GST_PAD_TEMPLATE_CAPS (templ);
2376 GST_CAT_DEBUG (GST_CAT_CAPS,
2377 "using pad template %p with caps %p %" GST_PTR_FORMAT, templ, result,
2380 result = gst_caps_ref (result);
2382 GST_CAT_DEBUG (GST_CAT_CAPS, "pad has no caps");
2383 result = gst_caps_new_empty ();
2385 GST_OBJECT_UNLOCK (pad);
2391 * gst_pad_get_parent_element:
2394 * Gets the parent of @pad, cast to a #GstElement. If a @pad has no parent or
2395 * its parent is not an element, return NULL.
2397 * Returns: The parent of the pad. The caller has a reference on the parent, so
2398 * unref when you're finished with it.
2403 gst_pad_get_parent_element (GstPad * pad)
2407 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2409 p = gst_object_get_parent (GST_OBJECT_CAST (pad));
2411 if (p && !GST_IS_ELEMENT (p)) {
2412 gst_object_unref (p);
2415 return GST_ELEMENT_CAST (p);
2419 * gst_object_default_error:
2420 * @source: the #GstObject that initiated the error.
2421 * @error: the GError.
2422 * @debug: an additional debug information string, or NULL.
2424 * A default error function.
2426 * The default handler will simply print the error string using g_print.
2429 gst_object_default_error (GstObject * source, GError * error, gchar * debug)
2431 gchar *name = gst_object_get_path_string (source);
2433 g_print (_("ERROR: from element %s: %s\n"), name, error->message);
2435 g_print (_("Additional debug info:\n%s\n"), debug);
2443 * @element_1: the #GstElement element to add to the bin
2444 * @...: additional elements to add to the bin
2446 * Adds a NULL-terminated list of elements to a bin. This function is
2447 * equivalent to calling gst_bin_add() for each member of the list. The return
2448 * value of each gst_bin_add() is ignored.
2451 gst_bin_add_many (GstBin * bin, GstElement * element_1, ...)
2455 g_return_if_fail (GST_IS_BIN (bin));
2456 g_return_if_fail (GST_IS_ELEMENT (element_1));
2458 va_start (args, element_1);
2461 gst_bin_add (bin, element_1);
2463 element_1 = va_arg (args, GstElement *);
2470 * gst_bin_remove_many:
2472 * @element_1: the first #GstElement to remove from the bin
2473 * @...: NULL-terminated list of elements to remove from the bin
2475 * Remove a list of elements from a bin. This function is equivalent
2476 * to calling gst_bin_remove() with each member of the list.
2479 gst_bin_remove_many (GstBin * bin, GstElement * element_1, ...)
2483 g_return_if_fail (GST_IS_BIN (bin));
2484 g_return_if_fail (GST_IS_ELEMENT (element_1));
2486 va_start (args, element_1);
2489 gst_bin_remove (bin, element_1);
2491 element_1 = va_arg (args, GstElement *);
2498 gst_element_populate_std_props (GObjectClass * klass, const gchar * prop_name,
2499 guint arg_id, GParamFlags flags)
2501 GQuark prop_id = g_quark_from_string (prop_name);
2504 static GQuark fd_id = 0;
2505 static GQuark blocksize_id;
2506 static GQuark bytesperread_id;
2507 static GQuark dump_id;
2508 static GQuark filesize_id;
2509 static GQuark mmapsize_id;
2510 static GQuark location_id;
2511 static GQuark offset_id;
2512 static GQuark silent_id;
2513 static GQuark touch_id;
2515 flags |= G_PARAM_STATIC_STRINGS;
2518 fd_id = g_quark_from_static_string ("fd");
2519 blocksize_id = g_quark_from_static_string ("blocksize");
2520 bytesperread_id = g_quark_from_static_string ("bytesperread");
2521 dump_id = g_quark_from_static_string ("dump");
2522 filesize_id = g_quark_from_static_string ("filesize");
2523 mmapsize_id = g_quark_from_static_string ("mmapsize");
2524 location_id = g_quark_from_static_string ("location");
2525 offset_id = g_quark_from_static_string ("offset");
2526 silent_id = g_quark_from_static_string ("silent");
2527 touch_id = g_quark_from_static_string ("touch");
2530 if (prop_id == fd_id) {
2531 pspec = g_param_spec_int ("fd", "File-descriptor",
2532 "File-descriptor for the file being read", 0, G_MAXINT, 0, flags);
2533 } else if (prop_id == blocksize_id) {
2534 pspec = g_param_spec_ulong ("blocksize", "Block Size",
2535 "Block size to read per buffer", 0, G_MAXULONG, 4096, flags);
2537 } else if (prop_id == bytesperread_id) {
2538 pspec = g_param_spec_int ("bytesperread", "Bytes per read",
2539 "Number of bytes to read per buffer", G_MININT, G_MAXINT, 0, flags);
2541 } else if (prop_id == dump_id) {
2542 pspec = g_param_spec_boolean ("dump", "Dump",
2543 "Dump bytes to stdout", FALSE, flags);
2545 } else if (prop_id == filesize_id) {
2546 pspec = g_param_spec_int64 ("filesize", "File Size",
2547 "Size of the file being read", 0, G_MAXINT64, 0, flags);
2549 } else if (prop_id == mmapsize_id) {
2550 pspec = g_param_spec_ulong ("mmapsize", "mmap() Block Size",
2551 "Size in bytes of mmap()d regions", 0, G_MAXULONG, 4 * 1048576, flags);
2553 } else if (prop_id == location_id) {
2554 pspec = g_param_spec_string ("location", "File Location",
2555 "Location of the file to read", NULL, flags);
2557 } else if (prop_id == offset_id) {
2558 pspec = g_param_spec_int64 ("offset", "File Offset",
2559 "Byte offset of current read pointer", 0, G_MAXINT64, 0, flags);
2561 } else if (prop_id == silent_id) {
2562 pspec = g_param_spec_boolean ("silent", "Silent", "Don't produce events",
2565 } else if (prop_id == touch_id) {
2566 pspec = g_param_spec_boolean ("touch", "Touch read data",
2567 "Touch data to force disk read before " "push ()", TRUE, flags);
2569 g_warning ("Unknown - 'standard' property '%s' id %d from klass %s",
2570 prop_name, arg_id, g_type_name (G_OBJECT_CLASS_TYPE (klass)));
2575 g_object_class_install_property (klass, arg_id, pspec);
2580 * gst_element_class_install_std_props:
2581 * @klass: the #GstElementClass to add the properties to.
2582 * @first_name: the name of the first property.
2583 * in a NULL terminated
2584 * @...: the id and flags of the first property, followed by
2585 * further 'name', 'id', 'flags' triplets and terminated by NULL.
2587 * Adds a list of standardized properties with types to the @klass.
2588 * the id is for the property switch in your get_prop method, and
2589 * the flags determine readability / writeability.
2592 gst_element_class_install_std_props (GstElementClass * klass,
2593 const gchar * first_name, ...)
2599 g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
2601 va_start (args, first_name);
2606 int arg_id = va_arg (args, int);
2607 int flags = va_arg (args, int);
2609 gst_element_populate_std_props ((GObjectClass *) klass, name, arg_id,
2612 name = va_arg (args, char *);
2621 * @buf1: the first source #GstBuffer to merge.
2622 * @buf2: the second source #GstBuffer to merge.
2624 * Create a new buffer that is the concatenation of the two source
2625 * buffers. The original source buffers will not be modified or
2626 * unref'd. Make sure you unref the source buffers if they are not used
2627 * anymore afterwards.
2629 * If the buffers point to contiguous areas of memory, the buffer
2630 * is created without copying the data.
2632 * Returns: the new #GstBuffer which is the concatenation of the source buffers.
2635 gst_buffer_merge (GstBuffer * buf1, GstBuffer * buf2)
2639 /* we're just a specific case of the more general gst_buffer_span() */
2640 result = gst_buffer_span (buf1, 0, buf2, buf1->size + buf2->size);
2647 * @buf1: the first source #GstBuffer.
2648 * @buf2: the second source #GstBuffer.
2650 * Create a new buffer that is the concatenation of the two source
2651 * buffers, and unrefs the original source buffers.
2653 * If the buffers point to contiguous areas of memory, the buffer
2654 * is created without copying the data.
2656 * This is a convenience function for C programmers. See also
2657 * gst_buffer_merge(), which does the same thing without
2658 * unreffing the input parameters. Language bindings without
2659 * explicit reference counting should not wrap this function.
2661 * Returns: the new #GstBuffer which is the concatenation of the source buffers.
2664 gst_buffer_join (GstBuffer * buf1, GstBuffer * buf2)
2668 result = gst_buffer_span (buf1, 0, buf2, buf1->size + buf2->size);
2669 gst_buffer_unref (buf1);
2670 gst_buffer_unref (buf2);
2678 * @dest: buffer to stamp
2679 * @src: buffer to stamp from
2681 * Copies additional information (the timestamp, duration, and offset start
2682 * and end) from one buffer to the other.
2684 * This function does not copy any buffer flags or caps and is equivalent to
2685 * gst_buffer_copy_metadata(@dest, @src, GST_BUFFER_COPY_TIMESTAMPS).
2687 * Deprecated: use gst_buffer_copy_metadata() instead, it provides more
2690 #ifndef GST_REMOVE_DEPRECATED
2691 #ifdef GST_DISABLE_DEPRECATED
2692 void gst_buffer_stamp (GstBuffer * dest, const GstBuffer * src);
2695 gst_buffer_stamp (GstBuffer * dest, const GstBuffer * src)
2697 gst_buffer_copy_metadata (dest, src, GST_BUFFER_COPY_TIMESTAMPS);
2699 #endif /* GST_REMOVE_DEPRECATED */
2702 getcaps_fold_func (GstPad * pad, GValue * ret, GstPad * orig)
2704 gboolean empty = FALSE;
2705 GstCaps *peercaps, *existing;
2707 existing = g_value_get_pointer (ret);
2708 peercaps = gst_pad_peer_get_caps_reffed (pad);
2709 if (G_LIKELY (peercaps)) {
2710 GstCaps *intersection = gst_caps_intersect (existing, peercaps);
2712 empty = gst_caps_is_empty (intersection);
2714 g_value_set_pointer (ret, intersection);
2715 gst_caps_unref (existing);
2716 gst_caps_unref (peercaps);
2718 gst_object_unref (pad);
2723 * gst_pad_proxy_getcaps:
2724 * @pad: a #GstPad to proxy.
2726 * Calls gst_pad_get_allowed_caps() for every other pad belonging to the
2727 * same element as @pad, and returns the intersection of the results.
2729 * This function is useful as a default getcaps function for an element
2730 * that can handle any stream format, but requires all its pads to have
2731 * the same caps. Two such elements are tee and adder.
2733 * Returns: the intersection of the other pads' allowed caps.
2736 gst_pad_proxy_getcaps (GstPad * pad)
2738 GstElement *element;
2739 GstCaps *caps, *intersected;
2741 GstIteratorResult res;
2742 GValue ret = { 0, };
2744 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
2746 GST_CAT_DEBUG (GST_CAT_PADS, "proxying getcaps for %s:%s",
2747 GST_DEBUG_PAD_NAME (pad));
2749 element = gst_pad_get_parent_element (pad);
2750 if (element == NULL)
2753 /* value to hold the return, by default it holds ANY, the ref is taken by
2755 g_value_init (&ret, G_TYPE_POINTER);
2756 g_value_set_pointer (&ret, gst_caps_new_any ());
2758 /* only iterate the pads in the oposite direction */
2759 if (GST_PAD_IS_SRC (pad))
2760 iter = gst_element_iterate_sink_pads (element);
2762 iter = gst_element_iterate_src_pads (element);
2766 gst_iterator_fold (iter, (GstIteratorFoldFunction) getcaps_fold_func,
2769 case GST_ITERATOR_RESYNC:
2770 /* unref any value stored */
2771 if ((caps = g_value_get_pointer (&ret)))
2772 gst_caps_unref (caps);
2773 /* need to reset the result again to ANY */
2774 g_value_set_pointer (&ret, gst_caps_new_any ());
2775 gst_iterator_resync (iter);
2777 case GST_ITERATOR_DONE:
2778 /* all pads iterated, return collected value */
2780 case GST_ITERATOR_OK:
2781 /* premature exit (happens if caps intersection is empty) */
2784 /* iterator returned _ERROR, mark an error and exit */
2785 if ((caps = g_value_get_pointer (&ret)))
2786 gst_caps_unref (caps);
2787 g_value_set_pointer (&ret, NULL);
2792 gst_iterator_free (iter);
2794 gst_object_unref (element);
2796 caps = g_value_get_pointer (&ret);
2797 g_value_unset (&ret);
2801 gst_caps_intersect (caps, gst_pad_get_pad_template_caps (pad));
2802 gst_caps_unref (caps);
2804 intersected = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
2812 GST_DEBUG_OBJECT (pad, "no parent");
2813 return gst_caps_copy (gst_pad_get_pad_template_caps (pad));
2817 g_warning ("Pad list returned error on element %s",
2818 GST_ELEMENT_NAME (element));
2819 gst_iterator_free (iter);
2820 gst_object_unref (element);
2821 return gst_caps_copy (gst_pad_get_pad_template_caps (pad));
2832 setcaps_fold_func (GstPad * pad, GValue * ret, SetCapsFoldData * data)
2834 gboolean success = TRUE;
2836 if (pad != data->orig) {
2837 success = gst_pad_set_caps (pad, data->caps);
2838 g_value_set_boolean (ret, success);
2840 gst_object_unref (pad);
2846 * gst_pad_proxy_setcaps
2847 * @pad: a #GstPad to proxy from
2848 * @caps: the #GstCaps to link with
2850 * Calls gst_pad_set_caps() for every other pad belonging to the
2851 * same element as @pad. If gst_pad_set_caps() fails on any pad,
2852 * the proxy setcaps fails. May be used only during negotiation.
2854 * Returns: TRUE if sucessful
2857 gst_pad_proxy_setcaps (GstPad * pad, GstCaps * caps)
2859 GstElement *element;
2861 GstIteratorResult res;
2862 GValue ret = { 0, };
2863 SetCapsFoldData data;
2865 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2866 g_return_val_if_fail (caps != NULL, FALSE);
2868 GST_CAT_DEBUG (GST_CAT_PADS, "proxying pad link for %s:%s",
2869 GST_DEBUG_PAD_NAME (pad));
2871 element = gst_pad_get_parent_element (pad);
2872 if (element == NULL)
2875 /* only iterate the pads in the oposite direction */
2876 if (GST_PAD_IS_SRC (pad))
2877 iter = gst_element_iterate_sink_pads (element);
2879 iter = gst_element_iterate_src_pads (element);
2881 g_value_init (&ret, G_TYPE_BOOLEAN);
2882 g_value_set_boolean (&ret, TRUE);
2887 res = gst_iterator_fold (iter, (GstIteratorFoldFunction) setcaps_fold_func,
2891 case GST_ITERATOR_RESYNC:
2892 /* reset return value */
2893 g_value_set_boolean (&ret, TRUE);
2894 gst_iterator_resync (iter);
2896 case GST_ITERATOR_DONE:
2897 /* all pads iterated, return collected value */
2900 /* iterator returned _ERROR or premature end with _OK,
2901 * mark an error and exit */
2906 gst_iterator_free (iter);
2908 gst_object_unref (element);
2910 /* ok not to unset the gvalue */
2911 return g_value_get_boolean (&ret);
2916 g_warning ("Pad list return error on element %s",
2917 GST_ELEMENT_NAME (element));
2918 gst_iterator_free (iter);
2919 gst_object_unref (element);
2925 * gst_pad_query_position:
2926 * @pad: a #GstPad to invoke the position query on.
2927 * @format: (inout): a pointer to the #GstFormat asked for.
2928 * On return contains the #GstFormat used.
2929 * @cur: (out): A location in which to store the current position, or NULL.
2931 * Queries a pad for the stream position.
2933 * Returns: TRUE if the query could be performed.
2936 gst_pad_query_position (GstPad * pad, GstFormat * format, gint64 * cur)
2941 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2942 g_return_val_if_fail (format != NULL, FALSE);
2944 query = gst_query_new_position (*format);
2945 ret = gst_pad_query (pad, query);
2948 gst_query_parse_position (query, format, cur);
2950 gst_query_unref (query);
2956 * gst_pad_query_peer_position:
2957 * @pad: a #GstPad on whose peer to invoke the position query on.
2958 * Must be a sink pad.
2959 * @format: a pointer to the #GstFormat asked for.
2960 * On return contains the #GstFormat used.
2961 * @cur: A location in which to store the current position, or NULL.
2963 * Queries the peer of a given sink pad for the stream position.
2965 * Returns: TRUE if the query could be performed.
2968 gst_pad_query_peer_position (GstPad * pad, GstFormat * format, gint64 * cur)
2970 gboolean ret = FALSE;
2973 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
2974 g_return_val_if_fail (GST_PAD_IS_SINK (pad), FALSE);
2975 g_return_val_if_fail (format != NULL, FALSE);
2977 peer = gst_pad_get_peer (pad);
2979 ret = gst_pad_query_position (peer, format, cur);
2980 gst_object_unref (peer);
2987 * gst_pad_query_duration:
2988 * @pad: a #GstPad to invoke the duration query on.
2989 * @format: a pointer to the #GstFormat asked for.
2990 * On return contains the #GstFormat used.
2991 * @duration: A location in which to store the total duration, or NULL.
2993 * Queries a pad for the total stream duration.
2995 * Returns: TRUE if the query could be performed.
2998 gst_pad_query_duration (GstPad * pad, GstFormat * format, gint64 * duration)
3003 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
3004 g_return_val_if_fail (format != NULL, FALSE);
3006 query = gst_query_new_duration (*format);
3007 ret = gst_pad_query (pad, query);
3010 gst_query_parse_duration (query, format, duration);
3012 gst_query_unref (query);
3018 * gst_pad_query_peer_duration:
3019 * @pad: a #GstPad on whose peer pad to invoke the duration query on.
3020 * Must be a sink pad.
3021 * @format: a pointer to the #GstFormat asked for.
3022 * On return contains the #GstFormat used.
3023 * @duration: A location in which to store the total duration, or NULL.
3025 * Queries the peer pad of a given sink pad for the total stream duration.
3027 * Returns: TRUE if the query could be performed.
3030 gst_pad_query_peer_duration (GstPad * pad, GstFormat * format,
3033 gboolean ret = FALSE;
3036 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
3037 g_return_val_if_fail (GST_PAD_IS_SINK (pad), FALSE);
3038 g_return_val_if_fail (format != NULL, FALSE);
3040 peer = gst_pad_get_peer (pad);
3042 ret = gst_pad_query_duration (peer, format, duration);
3043 gst_object_unref (peer);
3050 * gst_pad_query_convert:
3051 * @pad: a #GstPad to invoke the convert query on.
3052 * @src_format: a #GstFormat to convert from.
3053 * @src_val: a value to convert.
3054 * @dest_format: a pointer to the #GstFormat to convert to.
3055 * @dest_val: a pointer to the result.
3057 * Queries a pad to convert @src_val in @src_format to @dest_format.
3059 * Returns: TRUE if the query could be performed.
3062 gst_pad_query_convert (GstPad * pad, GstFormat src_format, gint64 src_val,
3063 GstFormat * dest_format, gint64 * dest_val)
3068 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
3069 g_return_val_if_fail (dest_format != NULL, FALSE);
3070 g_return_val_if_fail (dest_val != NULL, FALSE);
3072 if (*dest_format == src_format || src_val == -1) {
3073 *dest_val = src_val;
3077 query = gst_query_new_convert (src_format, src_val, *dest_format);
3078 ret = gst_pad_query (pad, query);
3081 gst_query_parse_convert (query, NULL, NULL, dest_format, dest_val);
3083 gst_query_unref (query);
3089 * gst_pad_query_peer_convert:
3090 * @pad: a #GstPad, on whose peer pad to invoke the convert query on.
3091 * Must be a sink pad.
3092 * @src_format: a #GstFormat to convert from.
3093 * @src_val: a value to convert.
3094 * @dest_format: a pointer to the #GstFormat to convert to.
3095 * @dest_val: a pointer to the result.
3097 * Queries the peer pad of a given sink pad to convert @src_val in @src_format
3100 * Returns: TRUE if the query could be performed.
3103 gst_pad_query_peer_convert (GstPad * pad, GstFormat src_format, gint64 src_val,
3104 GstFormat * dest_format, gint64 * dest_val)
3106 gboolean ret = FALSE;
3109 g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
3110 g_return_val_if_fail (GST_PAD_IS_SINK (pad), FALSE);
3111 g_return_val_if_fail (dest_format != NULL, FALSE);
3112 g_return_val_if_fail (dest_val != NULL, FALSE);
3114 peer = gst_pad_get_peer (pad);
3116 ret = gst_pad_query_convert (peer, src_format, src_val, dest_format,
3118 gst_object_unref (peer);
3125 * gst_atomic_int_set:
3126 * @atomic_int: pointer to an atomic integer
3127 * @value: value to set
3129 * Unconditionally sets the atomic integer to @value.
3131 * Deprecated: Use g_atomic_int_set().
3134 #ifndef GST_REMOVE_DEPRECATED
3135 #ifdef GST_DISABLE_DEPRECATED
3136 void gst_atomic_int_set (gint * atomic_int, gint value);
3139 gst_atomic_int_set (gint * atomic_int, gint value)
3141 g_atomic_int_set (atomic_int, value);
3146 * gst_pad_add_data_probe:
3147 * @pad: pad to add the data probe handler to
3148 * @handler: function to call when data is passed over pad
3149 * @data: data to pass along with the handler
3151 * Adds a "data probe" to a pad. This function will be called whenever data
3152 * passes through a pad. In this case data means both events and buffers. The
3153 * probe will be called with the data as an argument, meaning @handler should
3154 * have the same callback signature as the #GstPad::have-data signal.
3155 * Note that the data will have a reference count greater than 1, so it will
3156 * be immutable -- you must not change it.
3158 * For source pads, the probe will be called after the blocking function, if any
3159 * (see gst_pad_set_blocked_async()), but before looking up the peer to chain
3160 * to. For sink pads, the probe function will be called before configuring the
3161 * sink with new caps, if any, and before calling the pad's chain function.
3163 * Your data probe should return TRUE to let the data continue to flow, or FALSE
3164 * to drop it. Dropping data is rarely useful, but occasionally comes in handy
3167 * Although probes are implemented internally by connecting @handler to the
3168 * have-data signal on the pad, if you want to remove a probe it is insufficient
3169 * to only call g_signal_handler_disconnect on the returned handler id. To
3170 * remove a probe, use the appropriate function, such as
3171 * gst_pad_remove_data_probe().
3173 * Returns: The handler id.
3176 gst_pad_add_data_probe (GstPad * pad, GCallback handler, gpointer data)
3178 return gst_pad_add_data_probe_full (pad, handler, data, NULL);
3182 * gst_pad_add_data_probe_full:
3183 * @pad: pad to add the data probe handler to
3184 * @handler: function to call when data is passed over pad
3185 * @data: data to pass along with the handler
3186 * @notify: function to call when the probe is disconnected, or NULL
3188 * Adds a "data probe" to a pad. This function will be called whenever data
3189 * passes through a pad. In this case data means both events and buffers. The
3190 * probe will be called with the data as an argument, meaning @handler should
3191 * have the same callback signature as the #GstPad::have-data signal.
3192 * Note that the data will have a reference count greater than 1, so it will
3193 * be immutable -- you must not change it.
3195 * For source pads, the probe will be called after the blocking function, if any
3196 * (see gst_pad_set_blocked_async()), but before looking up the peer to chain
3197 * to. For sink pads, the probe function will be called before configuring the
3198 * sink with new caps, if any, and before calling the pad's chain function.
3200 * Your data probe should return TRUE to let the data continue to flow, or FALSE
3201 * to drop it. Dropping data is rarely useful, but occasionally comes in handy
3204 * Although probes are implemented internally by connecting @handler to the
3205 * have-data signal on the pad, if you want to remove a probe it is insufficient
3206 * to only call g_signal_handler_disconnect on the returned handler id. To
3207 * remove a probe, use the appropriate function, such as
3208 * gst_pad_remove_data_probe().
3210 * The @notify function is called when the probe is disconnected and usually
3211 * used to free @data.
3213 * Returns: The handler id.
3218 gst_pad_add_data_probe_full (GstPad * pad, GCallback handler,
3219 gpointer data, GDestroyNotify notify)
3223 g_return_val_if_fail (GST_IS_PAD (pad), 0);
3224 g_return_val_if_fail (handler != NULL, 0);
3226 GST_OBJECT_LOCK (pad);
3228 /* we only expose a GDestroyNotify in our API because that's less confusing */
3229 sigid = g_signal_connect_data (pad, "have-data", handler, data,
3230 (GClosureNotify) notify, 0);
3232 GST_PAD_DO_EVENT_SIGNALS (pad)++;
3233 GST_PAD_DO_BUFFER_SIGNALS (pad)++;
3234 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
3235 "adding data probe, now %d data, %d event probes",
3236 GST_PAD_DO_BUFFER_SIGNALS (pad), GST_PAD_DO_EVENT_SIGNALS (pad));
3237 GST_OBJECT_UNLOCK (pad);
3243 * gst_pad_add_event_probe:
3244 * @pad: pad to add the event probe handler to
3245 * @handler: function to call when events are passed over pad
3246 * @data: data to pass along with the handler
3248 * Adds a probe that will be called for all events passing through a pad. See
3249 * gst_pad_add_data_probe() for more information.
3251 * Returns: The handler id
3254 gst_pad_add_event_probe (GstPad * pad, GCallback handler, gpointer data)
3256 return gst_pad_add_event_probe_full (pad, handler, data, NULL);
3260 * gst_pad_add_event_probe_full:
3261 * @pad: pad to add the event probe handler to
3262 * @handler: function to call when events are passed over pad
3263 * @data: data to pass along with the handler, or NULL
3264 * @notify: function to call when probe is disconnected, or NULL
3266 * Adds a probe that will be called for all events passing through a pad. See
3267 * gst_pad_add_data_probe() for more information.
3269 * The @notify function is called when the probe is disconnected and usually
3270 * used to free @data.
3272 * Returns: The handler id
3277 gst_pad_add_event_probe_full (GstPad * pad, GCallback handler,
3278 gpointer data, GDestroyNotify notify)
3282 g_return_val_if_fail (GST_IS_PAD (pad), 0);
3283 g_return_val_if_fail (handler != NULL, 0);
3285 GST_OBJECT_LOCK (pad);
3287 /* we only expose a GDestroyNotify in our API because that's less confusing */
3288 sigid = g_signal_connect_data (pad, "have-data::event", handler, data,
3289 (GClosureNotify) notify, 0);
3291 GST_PAD_DO_EVENT_SIGNALS (pad)++;
3292 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "adding event probe, now %d probes",
3293 GST_PAD_DO_EVENT_SIGNALS (pad));
3294 GST_OBJECT_UNLOCK (pad);
3300 * gst_pad_add_buffer_probe:
3301 * @pad: pad to add the buffer probe handler to
3302 * @handler: function to call when buffers are passed over pad
3303 * @data: data to pass along with the handler
3305 * Adds a probe that will be called for all buffers passing through a pad. See
3306 * gst_pad_add_data_probe() for more information.
3308 * Returns: The handler id
3311 gst_pad_add_buffer_probe (GstPad * pad, GCallback handler, gpointer data)
3313 return gst_pad_add_buffer_probe_full (pad, handler, data, NULL);
3317 * gst_pad_add_buffer_probe_full:
3318 * @pad: pad to add the buffer probe handler to
3319 * @handler: function to call when buffer are passed over pad
3320 * @data: data to pass along with the handler
3321 * @notify: function to call when the probe is disconnected, or NULL
3323 * Adds a probe that will be called for all buffers passing through a pad. See
3324 * gst_pad_add_data_probe() for more information.
3326 * The @notify function is called when the probe is disconnected and usually
3327 * used to free @data.
3329 * Returns: The handler id
3334 gst_pad_add_buffer_probe_full (GstPad * pad, GCallback handler,
3335 gpointer data, GDestroyNotify notify)
3339 g_return_val_if_fail (GST_IS_PAD (pad), 0);
3340 g_return_val_if_fail (handler != NULL, 0);
3342 GST_OBJECT_LOCK (pad);
3344 /* we only expose a GDestroyNotify in our API because that's less confusing */
3345 sigid = g_signal_connect_data (pad, "have-data::buffer", handler, data,
3346 (GClosureNotify) notify, 0);
3348 GST_PAD_DO_BUFFER_SIGNALS (pad)++;
3349 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad, "adding buffer probe, now %d probes",
3350 GST_PAD_DO_BUFFER_SIGNALS (pad));
3351 GST_OBJECT_UNLOCK (pad);
3357 * gst_pad_remove_data_probe:
3358 * @pad: pad to remove the data probe handler from
3359 * @handler_id: handler id returned from gst_pad_add_data_probe
3361 * Removes a data probe from @pad.
3364 gst_pad_remove_data_probe (GstPad * pad, guint handler_id)
3366 g_return_if_fail (GST_IS_PAD (pad));
3367 g_return_if_fail (handler_id > 0);
3369 GST_OBJECT_LOCK (pad);
3370 g_signal_handler_disconnect (pad, handler_id);
3371 GST_PAD_DO_BUFFER_SIGNALS (pad)--;
3372 GST_PAD_DO_EVENT_SIGNALS (pad)--;
3373 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
3374 "removed data probe, now %d event, %d buffer probes",
3375 GST_PAD_DO_EVENT_SIGNALS (pad), GST_PAD_DO_BUFFER_SIGNALS (pad));
3376 GST_OBJECT_UNLOCK (pad);
3381 * gst_pad_remove_event_probe:
3382 * @pad: pad to remove the event probe handler from
3383 * @handler_id: handler id returned from gst_pad_add_event_probe
3385 * Removes an event probe from @pad.
3388 gst_pad_remove_event_probe (GstPad * pad, guint handler_id)
3390 g_return_if_fail (GST_IS_PAD (pad));
3391 g_return_if_fail (handler_id > 0);
3393 GST_OBJECT_LOCK (pad);
3394 g_signal_handler_disconnect (pad, handler_id);
3395 GST_PAD_DO_EVENT_SIGNALS (pad)--;
3396 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
3397 "removed event probe, now %d event probes",
3398 GST_PAD_DO_EVENT_SIGNALS (pad));
3399 GST_OBJECT_UNLOCK (pad);
3403 * gst_pad_remove_buffer_probe:
3404 * @pad: pad to remove the buffer probe handler from
3405 * @handler_id: handler id returned from gst_pad_add_buffer_probe
3407 * Removes a buffer probe from @pad.
3410 gst_pad_remove_buffer_probe (GstPad * pad, guint handler_id)
3412 g_return_if_fail (GST_IS_PAD (pad));
3413 g_return_if_fail (handler_id > 0);
3415 GST_OBJECT_LOCK (pad);
3416 g_signal_handler_disconnect (pad, handler_id);
3417 GST_PAD_DO_BUFFER_SIGNALS (pad)--;
3418 GST_CAT_DEBUG_OBJECT (GST_CAT_PADS, pad,
3419 "removed buffer probe, now %d buffer probes",
3420 GST_PAD_DO_BUFFER_SIGNALS (pad));
3421 GST_OBJECT_UNLOCK (pad);
3426 * gst_element_found_tags_for_pad:
3427 * @element: element for which to post taglist to bus.
3428 * @pad: pad on which to push tag-event.
3429 * @list: the taglist to post on the bus and create event from.
3431 * Posts a message to the bus that new tags were found and pushes the
3432 * tags as event. Takes ownership of the @list.
3434 * This is a utility method for elements. Applications should use the
3435 * #GstTagSetter interface.
3438 gst_element_found_tags_for_pad (GstElement * element,
3439 GstPad * pad, GstTagList * list)
3441 g_return_if_fail (element != NULL);
3442 g_return_if_fail (pad != NULL);
3443 g_return_if_fail (list != NULL);
3445 gst_pad_push_event (pad, gst_event_new_tag (gst_tag_list_copy (list)));
3446 /* FIXME 0.11: Set the pad as source. */
3447 gst_element_post_message (element,
3448 gst_message_new_tag_full (GST_OBJECT (element), pad, list));
3452 push_and_ref (GstPad * pad, GstEvent * event)
3454 gst_pad_push_event (pad, gst_event_ref (event));
3455 /* iterator refs pad, we unref when we are done with it */
3456 gst_object_unref (pad);
3460 * gst_element_found_tags:
3461 * @element: element for which we found the tags.
3462 * @list: list of tags.
3464 * Posts a message to the bus that new tags were found, and pushes an event
3465 * to all sourcepads. Takes ownership of the @list.
3467 * This is a utility method for elements. Applications should use the
3468 * #GstTagSetter interface.
3471 gst_element_found_tags (GstElement * element, GstTagList * list)
3476 g_return_if_fail (element != NULL);
3477 g_return_if_fail (list != NULL);
3479 iter = gst_element_iterate_src_pads (element);
3480 event = gst_event_new_tag (gst_tag_list_copy (list));
3481 gst_iterator_foreach (iter, (GFunc) push_and_ref, event);
3482 gst_iterator_free (iter);
3483 gst_event_unref (event);
3485 gst_element_post_message (element,
3486 gst_message_new_tag (GST_OBJECT (element), list));
3490 element_find_unlinked_pad (GstElement * element, GstPadDirection direction)
3493 GstPad *unlinked_pad = NULL;
3496 switch (direction) {
3498 iter = gst_element_iterate_src_pads (element);
3501 iter = gst_element_iterate_sink_pads (element);
3504 g_return_val_if_reached (NULL);
3511 switch (gst_iterator_next (iter, &pad)) {
3512 case GST_ITERATOR_OK:{
3515 GST_CAT_LOG (GST_CAT_ELEMENT_PADS, "examining pad %s:%s",
3516 GST_DEBUG_PAD_NAME (pad));
3518 peer = gst_pad_get_peer (GST_PAD (pad));
3522 GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
3523 "found existing unlinked pad %s:%s",
3524 GST_DEBUG_PAD_NAME (unlinked_pad));
3526 gst_object_unref (pad);
3527 gst_object_unref (peer);
3531 case GST_ITERATOR_DONE:
3534 case GST_ITERATOR_RESYNC:
3535 gst_iterator_resync (iter);
3537 case GST_ITERATOR_ERROR:
3538 g_return_val_if_reached (NULL);
3543 gst_iterator_free (iter);
3545 return unlinked_pad;
3549 * gst_bin_find_unlinked_pad:
3550 * @bin: bin in which to look for elements with unlinked pads
3551 * @direction: whether to look for an unlinked source or sink pad
3553 * Recursively looks for elements with an unlinked pad of the given
3554 * direction within the specified bin and returns an unlinked pad
3555 * if one is found, or NULL otherwise. If a pad is found, the caller
3556 * owns a reference to it and should use gst_object_unref() on the
3557 * pad when it is not needed any longer.
3559 * Returns: unlinked pad of the given direction, or NULL.
3564 gst_bin_find_unlinked_pad (GstBin * bin, GstPadDirection direction)
3570 g_return_val_if_fail (GST_IS_BIN (bin), NULL);
3571 g_return_val_if_fail (direction != GST_PAD_UNKNOWN, NULL);
3574 iter = gst_bin_iterate_recurse (bin);
3578 switch (gst_iterator_next (iter, &element)) {
3579 case GST_ITERATOR_OK:
3580 pad = element_find_unlinked_pad (GST_ELEMENT (element), direction);
3581 gst_object_unref (element);
3585 case GST_ITERATOR_DONE:
3588 case GST_ITERATOR_RESYNC:
3589 gst_iterator_resync (iter);
3591 case GST_ITERATOR_ERROR:
3592 g_return_val_if_reached (NULL);
3597 gst_iterator_free (iter);
3603 * gst_bin_find_unconnected_pad:
3604 * @bin: bin in which to look for elements with unlinked pads
3605 * @direction: whether to look for an unlinked source or sink pad
3607 * Recursively looks for elements with an unlinked pad of the given
3608 * direction within the specified bin and returns an unlinked pad
3609 * if one is found, or NULL otherwise. If a pad is found, the caller
3610 * owns a reference to it and should use gst_object_unref() on the
3611 * pad when it is not needed any longer.
3613 * Returns: unlinked pad of the given direction, or NULL.
3617 * Deprecated: use gst_bin_find_unlinked_pad() instead.
3619 #ifndef GST_REMOVE_DEPRECATED
3620 #ifdef GST_DISABLE_DEPRECATED
3621 GstPad *gst_bin_find_unconnected_pad (GstBin * bin, GstPadDirection direction);
3624 gst_bin_find_unconnected_pad (GstBin * bin, GstPadDirection direction)
3626 return gst_bin_find_unlinked_pad (bin, direction);
3631 * gst_parse_bin_from_description:
3632 * @bin_description: command line describing the bin
3633 * @ghost_unlinked_pads: whether to automatically create ghost pads
3634 * for unlinked source or sink pads within the bin
3635 * @err: where to store the error message in case of an error, or NULL
3637 * This is a convenience wrapper around gst_parse_launch() to create a
3638 * #GstBin from a gst-launch-style pipeline description. See
3639 * gst_parse_launch() and the gst-launch man page for details about the
3640 * syntax. Ghost pads on the bin for unlinked source or sink pads
3641 * within the bin can automatically be created (but only a maximum of
3642 * one ghost pad for each direction will be created; if you expect
3643 * multiple unlinked source pads or multiple unlinked sink pads
3644 * and want them all ghosted, you will have to create the ghost pads
3647 * Returns: a newly-created bin, or NULL if an error occurred.
3652 gst_parse_bin_from_description (const gchar * bin_description,
3653 gboolean ghost_unlinked_pads, GError ** err)
3655 return gst_parse_bin_from_description_full (bin_description,
3656 ghost_unlinked_pads, NULL, 0, err);
3660 * gst_parse_bin_from_description_full:
3661 * @bin_description: command line describing the bin
3662 * @ghost_unlinked_pads: whether to automatically create ghost pads
3663 * for unlinked source or sink pads within the bin
3664 * @context: a parse context allocated with gst_parse_context_new(), or %NULL
3665 * @flags: parsing options, or #GST_PARSE_FLAG_NONE
3666 * @err: where to store the error message in case of an error, or NULL
3668 * This is a convenience wrapper around gst_parse_launch() to create a
3669 * #GstBin from a gst-launch-style pipeline description. See
3670 * gst_parse_launch() and the gst-launch man page for details about the
3671 * syntax. Ghost pads on the bin for unlinked source or sink pads
3672 * within the bin can automatically be created (but only a maximum of
3673 * one ghost pad for each direction will be created; if you expect
3674 * multiple unlinked source pads or multiple unlinked sink pads
3675 * and want them all ghosted, you will have to create the ghost pads
3678 * Returns: a newly-created bin, or NULL if an error occurred.
3683 gst_parse_bin_from_description_full (const gchar * bin_description,
3684 gboolean ghost_unlinked_pads, GstParseContext * context,
3685 GstParseFlags flags, GError ** err)
3687 #ifndef GST_DISABLE_PARSE
3692 g_return_val_if_fail (bin_description != NULL, NULL);
3693 g_return_val_if_fail (err == NULL || *err == NULL, NULL);
3695 GST_DEBUG ("Making bin from description '%s'", bin_description);
3697 /* parse the pipeline to a bin */
3698 desc = g_strdup_printf ("bin.( %s )", bin_description);
3699 bin = (GstBin *) gst_parse_launch_full (desc, context, flags, err);
3702 if (bin == NULL || (err && *err != NULL)) {
3704 gst_object_unref (bin);
3708 /* find pads and ghost them if necessary */
3709 if (ghost_unlinked_pads) {
3710 if ((pad = gst_bin_find_unlinked_pad (bin, GST_PAD_SRC))) {
3711 gst_element_add_pad (GST_ELEMENT (bin), gst_ghost_pad_new ("src", pad));
3712 gst_object_unref (pad);
3714 if ((pad = gst_bin_find_unlinked_pad (bin, GST_PAD_SINK))) {
3715 gst_element_add_pad (GST_ELEMENT (bin), gst_ghost_pad_new ("sink", pad));
3716 gst_object_unref (pad);
3720 return GST_ELEMENT (bin);
3724 GST_WARNING ("Disabled API called");
3726 msg = gst_error_get_message (GST_CORE_ERROR, GST_CORE_ERROR_DISABLED);
3727 g_set_error (err, GST_CORE_ERROR, GST_CORE_ERROR_DISABLED, "%s", msg);
3735 * gst_type_register_static_full:
3736 * @parent_type: The GType of the parent type the newly registered type will
3738 * @type_name: NULL-terminated string used as the name of the new type
3739 * @class_size: Size of the class structure.
3740 * @base_init: Location of the base initialization function (optional).
3741 * @base_finalize: Location of the base finalization function (optional).
3742 * @class_init: Location of the class initialization function for class types
3743 * Location of the default vtable inititalization function for interface
3745 * @class_finalize: Location of the class finalization function for class types.
3746 * Location of the default vtable finalization function for interface types.
3748 * @class_data: User-supplied data passed to the class init/finalize functions.
3749 * @instance_size: Size of the instance (object) structure (required for
3750 * instantiatable types only).
3751 * @n_preallocs: The number of pre-allocated (cached) instances to reserve
3752 * memory for (0 indicates no caching). Ignored on recent GLib's.
3753 * @instance_init: Location of the instance initialization function (optional,
3754 * for instantiatable types only).
3755 * @value_table: A GTypeValueTable function table for generic handling of
3756 * GValues of this type (usually only useful for fundamental types).
3757 * @flags: #GTypeFlags for this GType. E.g: G_TYPE_FLAG_ABSTRACT
3759 * Helper function which constructs a #GTypeInfo structure and registers a
3760 * GType, but which generates less linker overhead than a static const
3761 * #GTypeInfo structure. For further details of the parameters, please see
3762 * #GTypeInfo in the GLib documentation.
3764 * Registers type_name as the name of a new static type derived from
3765 * parent_type. The value of flags determines the nature (e.g. abstract or
3766 * not) of the type. It works by filling a GTypeInfo struct and calling
3767 * g_type_register_static().
3769 * Returns: A #GType for the newly-registered type.
3774 gst_type_register_static_full (GType parent_type,
3775 const gchar * type_name,
3777 GBaseInitFunc base_init,
3778 GBaseFinalizeFunc base_finalize,
3779 GClassInitFunc class_init,
3780 GClassFinalizeFunc class_finalize,
3781 gconstpointer class_data,
3782 guint instance_size,
3783 guint16 n_preallocs,
3784 GInstanceInitFunc instance_init,
3785 const GTypeValueTable * value_table, GTypeFlags flags)
3789 info.class_size = class_size;
3790 info.base_init = base_init;
3791 info.base_finalize = base_finalize;
3792 info.class_init = class_init;
3793 info.class_finalize = class_finalize;
3794 info.class_data = class_data;
3795 info.instance_size = instance_size;
3796 info.n_preallocs = n_preallocs;
3797 info.instance_init = instance_init;
3798 info.value_table = value_table;
3800 return g_type_register_static (parent_type, type_name, &info, flags);
3805 * gst_util_get_timestamp:
3807 * Get a timestamp as GstClockTime to be used for interval meassurements.
3808 * The timestamp should not be interpreted in any other way.
3810 * Returns: the timestamp
3815 gst_util_get_timestamp (void)
3817 #if defined (HAVE_POSIX_TIMERS) && defined(HAVE_MONOTONIC_CLOCK)
3818 struct timespec now;
3820 clock_gettime (CLOCK_MONOTONIC, &now);
3821 return GST_TIMESPEC_TO_TIME (now);
3825 g_get_current_time (&now);
3826 return GST_TIMEVAL_TO_TIME (now);
3831 * gst_util_array_binary_search:
3832 * @array: the sorted input array
3833 * @num_elements: number of elements in the array
3834 * @element_size: size of every element in bytes
3835 * @search_func: function to compare two elements, @search_data will always be passed as second argument
3836 * @mode: search mode that should be used
3837 * @search_data: element that should be found
3838 * @user_data: data to pass to @search_func
3840 * Searches inside @array for @search_data by using the comparison function
3841 * @search_func. @array must be sorted ascending.
3843 * As @search_data is always passed as second argument to @search_func it's
3844 * not required that @search_data has the same type as the array elements.
3846 * The complexity of this search function is O(log (num_elements)).
3848 * Returns: The address of the found element or %NULL if nothing was found
3853 gst_util_array_binary_search (gpointer array, guint num_elements,
3854 gsize element_size, GCompareDataFunc search_func, GstSearchMode mode,
3855 gconstpointer search_data, gpointer user_data)
3857 glong left = 0, right = num_elements - 1, m;
3859 guint8 *data = (guint8 *) array;
3861 g_return_val_if_fail (array != NULL, NULL);
3862 g_return_val_if_fail (element_size > 0, NULL);
3863 g_return_val_if_fail (search_func != NULL, NULL);
3865 /* 0. No elements => return NULL */
3866 if (num_elements == 0)
3869 /* 1. If search_data is before the 0th element return the 0th element */
3870 ret = search_func (data, search_data, user_data);
3871 if ((ret >= 0 && mode == GST_SEARCH_MODE_AFTER) || ret == 0)
3876 /* 2. If search_data is after the last element return the last element */
3878 search_func (data + (num_elements - 1) * element_size, search_data,
3880 if ((ret <= 0 && mode == GST_SEARCH_MODE_BEFORE) || ret == 0)
3881 return data + (num_elements - 1) * element_size;
3885 /* 3. else binary search */
3887 m = left + (right - left) / 2;
3889 ret = search_func (data + m * element_size, search_data, user_data);
3892 return data + m * element_size;
3893 } else if (ret < 0) {
3899 /* No exact match found */
3901 if (mode == GST_SEARCH_MODE_EXACT) {
3903 } else if (mode == GST_SEARCH_MODE_AFTER) {
3905 return (m < num_elements) ? data + (m + 1) * element_size : NULL;
3907 return data + m * element_size;
3910 return data + m * element_size;
3912 return (m > 0) ? data + (m - 1) * element_size : NULL;
3918 /* Finds the greatest common divisor.
3919 * Returns 1 if none other found.
3920 * This is Euclid's algorithm. */
3923 * gst_util_greatest_common_divisor:
3924 * @a: First value as #gint
3925 * @b: Second value as #gint
3927 * Calculates the greatest common divisor of @a
3930 * Returns: Greatest common divisor of @a and @b
3935 gst_util_greatest_common_divisor (gint a, gint b)
3948 * gst_util_fraction_to_double:
3949 * @src_n: Fraction numerator as #gint
3950 * @src_d: Fraction denominator #gint
3951 * @dest: pointer to a #gdouble for the result
3953 * Transforms a #gdouble to a fraction and simplifies the result.
3958 gst_util_fraction_to_double (gint src_n, gint src_d, gdouble * dest)
3960 g_return_if_fail (dest != NULL);
3961 g_return_if_fail (src_d != 0);
3963 *dest = ((gdouble) src_n) / ((gdouble) src_d);
3966 #define MAX_TERMS 30
3967 #define MIN_DIVISOR 1.0e-10
3968 #define MAX_ERROR 1.0e-20
3970 /* use continued fractions to transform a double into a fraction,
3971 * see http://mathforum.org/dr.math/faq/faq.fractions.html#decfrac.
3972 * This algorithm takes care of overflows.
3976 * gst_util_double_to_fraction:
3977 * @src: #gdouble to transform
3978 * @dest_n: pointer to a #gint to hold the result numerator
3979 * @dest_d: pointer to a #gint to hold the result denominator
3981 * Transforms a #gdouble to a fraction and simplifies
3987 gst_util_double_to_fraction (gdouble src, gint * dest_n, gint * dest_d)
3990 gdouble V, F; /* double being converted */
3991 gint N, D; /* will contain the result */
3992 gint A; /* current term in continued fraction */
3993 gint64 N1, D1; /* numerator, denominator of last approx */
3994 gint64 N2, D2; /* numerator, denominator of previous approx */
3997 gboolean negative = FALSE;
3999 g_return_if_fail (dest_n != NULL);
4000 g_return_if_fail (dest_d != NULL);
4002 /* initialize fraction being converted */
4010 /* initialize fractions with 1/0, 0/1 */
4018 for (i = 0; i < MAX_TERMS; i++) {
4020 A = (gint) F; /* no floor() needed, F is always >= 0 */
4021 /* get new divisor */
4024 /* calculate new fraction in temp */
4028 /* guard against overflow */
4029 if (N2 > G_MAXINT || D2 > G_MAXINT) {
4036 /* save last two fractions */
4042 /* quit if dividing by zero or close enough to target */
4043 if (F < MIN_DIVISOR || fabs (V - ((gdouble) N) / D) < MAX_ERROR) {
4047 /* Take reciprocal */
4050 /* fix for overflow */
4055 /* fix for negative */
4060 gcd = gst_util_greatest_common_divisor (N, D);
4072 * gst_util_fraction_multiply:
4073 * @a_n: Numerator of first value
4074 * @a_d: Denominator of first value
4075 * @b_n: Numerator of second value
4076 * @b_d: Denominator of second value
4077 * @res_n: Pointer to #gint to hold the result numerator
4078 * @res_d: Pointer to #gint to hold the result denominator
4080 * Multiplies the fractions @a_n/@a_d and @b_n/@b_d and stores
4081 * the result in @res_n and @res_d.
4083 * Returns: %FALSE on overflow, %TRUE otherwise.
4088 gst_util_fraction_multiply (gint a_n, gint a_d, gint b_n, gint b_d,
4089 gint * res_n, gint * res_d)
4093 g_return_val_if_fail (res_n != NULL, FALSE);
4094 g_return_val_if_fail (res_d != NULL, FALSE);
4095 g_return_val_if_fail (a_d != 0, FALSE);
4096 g_return_val_if_fail (b_d != 0, FALSE);
4098 gcd = gst_util_greatest_common_divisor (a_n, a_d);
4102 gcd = gst_util_greatest_common_divisor (b_n, b_d);
4106 gcd = gst_util_greatest_common_divisor (a_n, b_d);
4110 gcd = gst_util_greatest_common_divisor (a_d, b_n);
4114 /* This would result in overflow */
4115 if (a_n != 0 && G_MAXINT / ABS (a_n) < ABS (b_n))
4117 if (G_MAXINT / ABS (a_d) < ABS (b_d))
4123 gcd = gst_util_greatest_common_divisor (*res_n, *res_d);
4131 * gst_util_fraction_add:
4132 * @a_n: Numerator of first value
4133 * @a_d: Denominator of first value
4134 * @b_n: Numerator of second value
4135 * @b_d: Denominator of second value
4136 * @res_n: Pointer to #gint to hold the result numerator
4137 * @res_d: Pointer to #gint to hold the result denominator
4139 * Adds the fractions @a_n/@a_d and @b_n/@b_d and stores
4140 * the result in @res_n and @res_d.
4142 * Returns: %FALSE on overflow, %TRUE otherwise.
4147 gst_util_fraction_add (gint a_n, gint a_d, gint b_n, gint b_d, gint * res_n,
4152 g_return_val_if_fail (res_n != NULL, FALSE);
4153 g_return_val_if_fail (res_d != NULL, FALSE);
4154 g_return_val_if_fail (a_d != 0, FALSE);
4155 g_return_val_if_fail (b_d != 0, FALSE);
4157 gcd = gst_util_greatest_common_divisor (a_n, a_d);
4161 gcd = gst_util_greatest_common_divisor (b_n, b_d);
4176 /* This would result in overflow */
4177 if (G_MAXINT / ABS (a_n) < ABS (b_n))
4179 if (G_MAXINT / ABS (a_d) < ABS (b_d))
4181 if (G_MAXINT / ABS (a_d) < ABS (b_d))
4184 *res_n = (a_n * b_d) + (a_d * b_n);
4187 gcd = gst_util_greatest_common_divisor (*res_n, *res_d);
4200 * gst_util_fraction_compare:
4201 * @a_n: Numerator of first value
4202 * @a_d: Denominator of first value
4203 * @b_n: Numerator of second value
4204 * @b_d: Denominator of second value
4206 * Compares the fractions @a_n/@a_d and @b_n/@b_d and returns
4207 * -1 if a < b, 0 if a = b and 1 if a > b.
4209 * Returns: -1 if a < b; 0 if a = b; 1 if a > b.
4214 gst_util_fraction_compare (gint a_n, gint a_d, gint b_n, gint b_d)
4220 g_return_val_if_fail (a_d != 0 && b_d != 0, 0);
4223 gcd = gst_util_greatest_common_divisor (a_n, a_d);
4227 gcd = gst_util_greatest_common_divisor (b_n, b_d);
4231 /* fractions are reduced when set, so we can quickly see if they're equal */
4232 if (a_n == b_n && a_d == b_d)
4235 /* extend to 64 bits */
4236 new_num_1 = ((gint64) a_n) * b_d;
4237 new_num_2 = ((gint64) b_n) * a_d;
4238 if (new_num_1 < new_num_2)
4240 if (new_num_1 > new_num_2)
4243 /* Should not happen because a_d and b_d are not 0 */
4244 g_return_val_if_reached (0);