--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gstreamer_core/gst/gstutils.c Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,3609 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ * 2000 Wim Taymans <wtay@chello.be>
+ * 2002 Thomas Vander Stichele <thomas@apestaart.org>
+ *
+ * gstutils.c: Utility functions: gtk_get_property stuff, etc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:gstutils
+ * @short_description: Various utility functions
+ *
+ * When defining own plugins, use the GST_BOILERPLATE ease gobject creation.
+ */
+
+#include "gst_private.h"
+#include <stdio.h>
+#include <string.h>
+
+#include "gstghostpad.h"
+#include "gstutils.h"
+#include "gsterror.h"
+#include "gstinfo.h"
+#include "gstparse.h"
+#include "gst-i18n-lib.h"
+
+#ifdef __SYMBIAN32__
+#include <glib_global.h>
+#include <gobject_global.h>
+#endif
+
+
+/**
+ * gst_util_dump_mem:
+ * @mem: a pointer to the memory to dump
+ * @size: the size of the memory block to dump
+ *
+ * Dumps the memory block into a hex representation. Useful for debugging.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_util_dump_mem (const guchar * mem, guint size)
+{
+ guint i, j;
+ GString *string = g_string_sized_new (50);
+ GString *chars = g_string_sized_new (18);
+
+ i = j = 0;
+ while (i < size) {
+ if (g_ascii_isprint (mem[i]))
+ g_string_append_c (chars, mem[i]);
+ else
+ g_string_append_c (chars, '.');
+
+ g_string_append_printf (string, "%02x ", mem[i]);
+
+ j++;
+ i++;
+
+ if (j == 16 || i == size) {
+ g_print ("%08x (%p): %-48.48s %-16.16s\n", i - j, mem + i - j,
+ string->str, chars->str);
+ g_string_set_size (string, 0);
+ g_string_set_size (chars, 0);
+ j = 0;
+ }
+ }
+ g_string_free (string, TRUE);
+ g_string_free (chars, TRUE);
+}
+
+
+/**
+ * gst_util_set_value_from_string:
+ * @value: the value to set
+ * @value_str: the string to get the value from
+ *
+ * Converts the string to the type of the value and
+ * sets the value with it.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_util_set_value_from_string (GValue * value, const gchar * value_str)
+{
+ gint sscanf_ret;
+
+ g_return_if_fail (value != NULL);
+ g_return_if_fail (value_str != NULL);
+
+ GST_CAT_DEBUG (GST_CAT_PARAMS, "parsing '%s' to type %s", value_str,
+ g_type_name (G_VALUE_TYPE (value)));
+
+ switch (G_VALUE_TYPE (value)) {
+ case G_TYPE_STRING:
+ g_value_set_string (value, value_str);
+ break;
+ case G_TYPE_ENUM:
+ case G_TYPE_INT:{
+ gint i;
+
+ sscanf_ret = sscanf (value_str, "%d", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_value_set_int (value, i);
+ break;
+ }
+ case G_TYPE_UINT:{
+ guint i;
+
+ sscanf_ret = sscanf (value_str, "%u", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_value_set_uint (value, i);
+ break;
+ }
+ case G_TYPE_LONG:{
+ glong i;
+
+ sscanf_ret = sscanf (value_str, "%ld", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_value_set_long (value, i);
+ break;
+ }
+ case G_TYPE_ULONG:{
+ gulong i;
+
+ sscanf_ret = sscanf (value_str, "%lu", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_value_set_ulong (value, i);
+ break;
+ }
+ case G_TYPE_BOOLEAN:{
+ gboolean i = FALSE;
+
+ if (!g_ascii_strncasecmp ("true", value_str, 4))
+ i = TRUE;
+ g_value_set_boolean (value, i);
+ break;
+ }
+ case G_TYPE_CHAR:{
+ gchar i;
+
+ sscanf_ret = sscanf (value_str, "%c", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_value_set_char (value, i);
+ break;
+ }
+ case G_TYPE_UCHAR:{
+ guchar i;
+
+ sscanf_ret = sscanf (value_str, "%c", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_value_set_uchar (value, i);
+ break;
+ }
+ case G_TYPE_FLOAT:{
+ gfloat i;
+
+ sscanf_ret = sscanf (value_str, "%f", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_value_set_float (value, i);
+ break;
+ }
+ case G_TYPE_DOUBLE:{
+ gfloat i;
+
+ sscanf_ret = sscanf (value_str, "%g", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_value_set_double (value, (gdouble) i);
+ break;
+ }
+ default:
+ break;
+ }
+}
+
+/**
+ * gst_util_set_object_arg:
+ * @object: the object to set the argument of
+ * @name: the name of the argument to set
+ * @value: the string value to set
+ *
+ * Convertes the string value to the type of the objects argument and
+ * sets the argument with it.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_util_set_object_arg (GObject * object, const gchar * name,
+ const gchar * value)
+{
+ gboolean sscanf_ret;
+
+ if (name && value) {
+ GParamSpec *paramspec;
+
+ paramspec =
+ g_object_class_find_property (G_OBJECT_GET_CLASS (object), name);
+
+ if (!paramspec) {
+ return;
+ }
+
+ GST_DEBUG ("paramspec->flags is %d, paramspec->value_type is %d",
+ paramspec->flags, (gint) paramspec->value_type);
+
+ if (paramspec->flags & G_PARAM_WRITABLE) {
+ switch (paramspec->value_type) {
+ case G_TYPE_STRING:
+ g_object_set (G_OBJECT (object), name, value, NULL);
+ break;
+ case G_TYPE_ENUM:
+ case G_TYPE_INT:{
+ gint i;
+
+ sscanf_ret = sscanf (value, "%d", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_object_set (G_OBJECT (object), name, i, NULL);
+ break;
+ }
+ case G_TYPE_UINT:{
+ guint i;
+
+ sscanf_ret = sscanf (value, "%u", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_object_set (G_OBJECT (object), name, i, NULL);
+ break;
+ }
+ case G_TYPE_LONG:{
+ glong i;
+
+ sscanf_ret = sscanf (value, "%ld", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_object_set (G_OBJECT (object), name, i, NULL);
+ break;
+ }
+ case G_TYPE_ULONG:{
+ gulong i;
+
+ sscanf_ret = sscanf (value, "%lu", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_object_set (G_OBJECT (object), name, i, NULL);
+ break;
+ }
+ case G_TYPE_BOOLEAN:{
+ gboolean i = FALSE;
+
+ if (!g_ascii_strncasecmp ("true", value, 4))
+ i = TRUE;
+ g_object_set (G_OBJECT (object), name, i, NULL);
+ break;
+ }
+ case G_TYPE_CHAR:{
+ gchar i;
+
+ sscanf_ret = sscanf (value, "%c", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_object_set (G_OBJECT (object), name, i, NULL);
+ break;
+ }
+ case G_TYPE_UCHAR:{
+ guchar i;
+
+ sscanf_ret = sscanf (value, "%c", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_object_set (G_OBJECT (object), name, i, NULL);
+ break;
+ }
+ case G_TYPE_FLOAT:{
+ gfloat i;
+
+ sscanf_ret = sscanf (value, "%f", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_object_set (G_OBJECT (object), name, i, NULL);
+ break;
+ }
+ case G_TYPE_DOUBLE:{
+ gfloat i;
+
+ sscanf_ret = sscanf (value, "%g", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_object_set (G_OBJECT (object), name, (gdouble) i, NULL);
+ break;
+ }
+ default:
+ if (G_IS_PARAM_SPEC_ENUM (paramspec)) {
+ gint i;
+
+ sscanf_ret = sscanf (value, "%d", &i);
+ g_return_if_fail (sscanf_ret == 1);
+ g_object_set (G_OBJECT (object), name, i, NULL);
+ }
+ break;
+ }
+ }
+ }
+}
+
+/* work around error C2520: conversion from unsigned __int64 to double
+ * not implemented, use signed __int64
+ *
+ * These are implemented as functions because on some platforms a 64bit int to
+ * double conversion is not defined/implemented.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+gdouble
+gst_util_guint64_to_gdouble (guint64 value)
+{
+ if (value & G_GINT64_CONSTANT (0x8000000000000000))
+ return (gdouble) ((gint64) value) + (gdouble) 18446744073709551616.;
+ else
+ return (gdouble) ((gint64) value);
+}
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+guint64
+gst_util_gdouble_to_guint64 (gdouble value)
+{
+ if (value < (gdouble) 9223372036854775808.) /* 1 << 63 */
+ return ((guint64) ((gint64) value));
+
+ value -= (gdouble) 18446744073709551616.;
+ return ((guint64) ((gint64) value));
+}
+
+/* convenience struct for getting high and low uint32 parts of
+ * a guint64 */
+typedef union
+{
+ guint64 ll;
+ struct
+ {
+#if G_BYTE_ORDER == G_BIG_ENDIAN
+ guint32 high, low;
+#else
+ guint32 low, high;
+#endif
+ } l;
+} GstUInt64;
+
+/* based on Hacker's Delight p152 */
+static guint64
+gst_util_div128_64 (GstUInt64 c1, GstUInt64 c0, guint64 denom)
+{
+ GstUInt64 q1, q0, rhat;
+ GstUInt64 v, cmp1, cmp2;
+ guint s;
+
+ v.ll = denom;
+
+ /* count number of leading zeroes, we know they must be in the high
+ * part of denom since denom > G_MAXUINT32. */
+ s = v.l.high | (v.l.high >> 1);
+ s |= (s >> 2);
+ s |= (s >> 4);
+ s |= (s >> 8);
+ s = ~(s | (s >> 16));
+ s = s - ((s >> 1) & 0x55555555);
+ s = (s & 0x33333333) + ((s >> 2) & 0x33333333);
+ s = (s + (s >> 4)) & 0x0f0f0f0f;
+ s += (s >> 8);
+ s = (s + (s >> 16)) & 0x3f;
+
+ if (s > 0) {
+ /* normalize divisor and dividend */
+ v.ll <<= s;
+ c1.ll = (c1.ll << s) | (c0.l.high >> (32 - s));
+ c0.ll <<= s;
+ }
+
+ q1.ll = c1.ll / v.l.high;
+ rhat.ll = c1.ll - q1.ll * v.l.high;
+
+ cmp1.l.high = rhat.l.low;
+ cmp1.l.low = c0.l.high;
+ cmp2.ll = q1.ll * v.l.low;
+
+ while (q1.l.high || cmp2.ll > cmp1.ll) {
+ q1.ll--;
+ rhat.ll += v.l.high;
+ if (rhat.l.high)
+ break;
+ cmp1.l.high = rhat.l.low;
+ cmp2.ll -= v.l.low;
+ }
+ c1.l.high = c1.l.low;
+ c1.l.low = c0.l.high;
+ c1.ll -= q1.ll * v.ll;
+ q0.ll = c1.ll / v.l.high;
+ rhat.ll = c1.ll - q0.ll * v.l.high;
+
+ cmp1.l.high = rhat.l.low;
+ cmp1.l.low = c0.l.low;
+ cmp2.ll = q0.ll * v.l.low;
+
+ while (q0.l.high || cmp2.ll > cmp1.ll) {
+ q0.ll--;
+ rhat.ll += v.l.high;
+ if (rhat.l.high)
+ break;
+ cmp1.l.high = rhat.l.low;
+ cmp2.ll -= v.l.low;
+ }
+ q0.l.high += q1.l.low;
+
+ return q0.ll;
+}
+
+static guint64
+gst_util_uint64_scale_int64 (guint64 val, guint64 num, guint64 denom)
+{
+ GstUInt64 a0, a1, b0, b1, c0, ct, c1, result;
+ GstUInt64 v, n;
+
+ /* prepare input */
+ v.ll = val;
+ n.ll = num;
+
+ /* do 128 bits multiply
+ * nh nl
+ * * vh vl
+ * ----------
+ * a0 = vl * nl
+ * a1 = vl * nh
+ * b0 = vh * nl
+ * b1 = + vh * nh
+ * -------------------
+ * c1,c0
+ */
+ a0.ll = (guint64) v.l.low * n.l.low;
+ a1.ll = (guint64) v.l.low * n.l.high;
+ b0.ll = (guint64) v.l.high * n.l.low;
+ b1.ll = (guint64) v.l.high * n.l.high;
+
+ /* and sum together with carry into 128 bits c1, c0 */
+ c0.l.low = a0.l.low;
+ ct.ll = (guint64) a0.l.high + a1.l.low + b0.l.low;
+ c0.l.high = ct.l.low;
+ c1.ll = (guint64) a1.l.high + b0.l.high + ct.l.high + b1.ll;
+
+ /* if high bits bigger than denom, we overflow */
+ if (c1.ll >= denom)
+ goto overflow;
+
+ /* shortcut for division by 1, c1.ll should be 0 because of the
+ * overflow check above. */
+ if (denom == 1)
+ return c0.ll;
+
+ /* and 128/64 bits division, result fits 64 bits */
+ if (denom <= G_MAXUINT32) {
+ guint32 den = (guint32) denom;
+
+ /* easy case, (c1,c0)128/(den)32 division */
+ c1.l.high %= den;
+ c1.l.high = c1.ll % den;
+ c1.l.low = c0.l.high;
+ c0.l.high = c1.ll % den;
+ result.l.high = c1.ll / den;
+ result.l.low = c0.ll / den;
+ } else {
+ result.ll = gst_util_div128_64 (c1, c0, denom);
+ }
+ return result.ll;
+
+overflow:
+ {
+ return G_MAXUINT64;
+ }
+}
+
+/**
+ * gst_util_uint64_scale:
+ * @val: the number to scale
+ * @num: the numerator of the scale ratio
+ * @denom: the denominator of the scale ratio
+ *
+ * Scale @val by @num / @denom, trying to avoid overflows.
+ *
+ * This function can potentially be very slow if denom > G_MAXUINT32.
+ *
+ * Returns: @val * @num / @denom, trying to avoid overflows.
+ * In the case of an overflow, this function returns G_MAXUINT64.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+guint64
+gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom)
+{
+ g_return_val_if_fail (denom != 0, G_MAXUINT64);
+
+ if (num == 0)
+ return 0;
+
+ if (num == 1 && denom == 1)
+ return val;
+
+ /* if the denom is high, we need to do a 64 muldiv */
+ if (denom > G_MAXINT32)
+ goto do_int64;
+
+ /* if num and denom are low we can do a 32 bit muldiv */
+ if (num <= G_MAXINT32)
+ goto do_int32;
+
+ /* val and num are high, we need 64 muldiv */
+ if (val > G_MAXINT32)
+ goto do_int64;
+
+ /* val is low and num is high, we can swap them and do 32 muldiv */
+ return gst_util_uint64_scale_int (num, (gint) val, (gint) denom);
+
+do_int32:
+ return gst_util_uint64_scale_int (val, (gint) num, (gint) denom);
+
+do_int64:
+ /* to the more heavy implementations... */
+ return gst_util_uint64_scale_int64 (val, num, denom);
+}
+
+/**
+ * gst_util_uint64_scale_int:
+ * @val: guint64 (such as a #GstClockTime) to scale.
+ * @num: numerator of the scale factor.
+ * @denom: denominator of the scale factor.
+ *
+ * Scale a guint64 by a factor expressed as a fraction (num/denom), avoiding
+ * overflows and loss of precision.
+ *
+ * @num and @denom must be positive integers. @denom cannot be 0.
+ *
+ * Returns: @val * @num / @denom, avoiding overflow and loss of precision.
+ * In the case of an overflow, this function returns G_MAXUINT64.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+guint64
+gst_util_uint64_scale_int (guint64 val, gint num, gint denom)
+{
+ GstUInt64 result;
+ GstUInt64 low, high;
+
+ g_return_val_if_fail (denom > 0, G_MAXUINT64);
+ g_return_val_if_fail (num >= 0, G_MAXUINT64);
+
+ if (num == 0)
+ return 0;
+
+ if (num == 1 && denom == 1)
+ return val;
+
+ if (val <= G_MAXUINT32)
+ /* simple case */
+ return val * num / denom;
+
+ /* do 96 bits mult/div */
+ low.ll = val;
+ result.ll = ((guint64) low.l.low) * num;
+ high.ll = ((guint64) low.l.high) * num + (result.l.high);
+
+ low.ll = high.ll / denom;
+ result.l.high = high.ll % denom;
+ result.ll /= denom;
+
+ /* avoid overflow */
+ if (low.ll + result.l.high > G_MAXUINT32)
+ goto overflow;
+
+ result.l.high += low.l.low;
+
+ return result.ll;
+
+overflow:
+ {
+ return G_MAXUINT64;
+ }
+}
+
+/* -----------------------------------------------------
+ *
+ * The following code will be moved out of the main
+ * gstreamer library someday.
+ */
+
+#include "gstpad.h"
+
+static void
+string_append_indent (GString * str, gint count)
+{
+ gint xx;
+
+ for (xx = 0; xx < count; xx++)
+ g_string_append_c (str, ' ');
+}
+
+/**
+ * gst_print_pad_caps:
+ * @buf: the buffer to print the caps in
+ * @indent: initial indentation
+ * @pad: the pad to print the caps from
+ *
+ * Write the pad capabilities in a human readable format into
+ * the given GString.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_print_pad_caps (GString * buf, gint indent, GstPad * pad)
+{
+ GstCaps *caps;
+
+ caps = pad->caps;
+
+ if (!caps) {
+ string_append_indent (buf, indent);
+ g_string_printf (buf, "%s:%s has no capabilities",
+ GST_DEBUG_PAD_NAME (pad));
+ } else {
+ char *s;
+
+ s = gst_caps_to_string (caps);
+ g_string_append (buf, s);
+ g_free (s);
+ }
+}
+
+/**
+ * gst_print_element_args:
+ * @buf: the buffer to print the args in
+ * @indent: initial indentation
+ * @element: the element to print the args of
+ *
+ * Print the element argument in a human readable format in the given
+ * GString.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_print_element_args (GString * buf, gint indent, GstElement * element)
+{
+ guint width;
+ GValue value = { 0, }; /* the important thing is that value.type = 0 */
+ gchar *str = NULL;
+ GParamSpec *spec, **specs, **walk;
+
+ specs = g_object_class_list_properties (G_OBJECT_GET_CLASS (element), NULL);
+
+ width = 0;
+ for (walk = specs; *walk; walk++) {
+ spec = *walk;
+ if (width < strlen (spec->name))
+ width = strlen (spec->name);
+ }
+
+ for (walk = specs; *walk; walk++) {
+ spec = *walk;
+
+ if (spec->flags & G_PARAM_READABLE) {
+ g_value_init (&value, G_PARAM_SPEC_VALUE_TYPE (spec));
+ g_object_get_property (G_OBJECT (element), spec->name, &value);
+ str = g_strdup_value_contents (&value);
+ g_value_unset (&value);
+ } else {
+ str = g_strdup ("Parameter not readable.");
+ }
+
+ string_append_indent (buf, indent);
+ g_string_append (buf, spec->name);
+ string_append_indent (buf, 2 + width - strlen (spec->name));
+ g_string_append (buf, str);
+ g_string_append_c (buf, '\n');
+
+ g_free (str);
+ }
+
+ g_free (specs);
+}
+
+/**
+ * gst_element_create_all_pads:
+ * @element: a #GstElement to create pads for
+ *
+ * Creates a pad for each pad template that is always available.
+ * This function is only useful during object intialization of
+ * subclasses of #GstElement.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_create_all_pads (GstElement * element)
+{
+ GList *padlist;
+
+ /* FIXME: lock element */
+
+ padlist =
+ gst_element_class_get_pad_template_list (GST_ELEMENT_CLASS
+ (G_OBJECT_GET_CLASS (element)));
+
+ while (padlist) {
+ GstPadTemplate *padtempl = (GstPadTemplate *) padlist->data;
+
+ if (padtempl->presence == GST_PAD_ALWAYS) {
+ GstPad *pad;
+
+ pad = gst_pad_new_from_template (padtempl, padtempl->name_template);
+
+ gst_element_add_pad (element, pad);
+ }
+ padlist = padlist->next;
+ }
+}
+
+/**
+ * gst_element_get_compatible_pad_template:
+ * @element: a #GstElement to get a compatible pad template for.
+ * @compattempl: the #GstPadTemplate to find a compatible template for.
+ *
+ * Retrieves a pad template from @element that is compatible with @compattempl.
+ * Pads from compatible templates can be linked together.
+ *
+ * Returns: a compatible #GstPadTemplate, or NULL if none was found. No
+ * unreferencing is necessary.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstPadTemplate *
+gst_element_get_compatible_pad_template (GstElement * element,
+ GstPadTemplate * compattempl)
+{
+ GstPadTemplate *newtempl = NULL;
+ GList *padlist;
+ GstElementClass *class;
+
+ g_return_val_if_fail (element != NULL, NULL);
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+ g_return_val_if_fail (compattempl != NULL, NULL);
+
+ class = GST_ELEMENT_GET_CLASS (element);
+
+ padlist = gst_element_class_get_pad_template_list (class);
+
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
+ "Looking for a suitable pad template in %s out of %d templates...",
+ GST_ELEMENT_NAME (element), g_list_length (padlist));
+
+ while (padlist) {
+ GstPadTemplate *padtempl = (GstPadTemplate *) padlist->data;
+ GstCaps *intersection;
+
+ /* Ignore name
+ * Ignore presence
+ * Check direction (must be opposite)
+ * Check caps
+ */
+ GST_CAT_LOG (GST_CAT_CAPS,
+ "checking pad template %s", padtempl->name_template);
+ if (padtempl->direction != compattempl->direction) {
+ GST_CAT_DEBUG (GST_CAT_CAPS,
+ "compatible direction: found %s pad template \"%s\"",
+ padtempl->direction == GST_PAD_SRC ? "src" : "sink",
+ padtempl->name_template);
+
+ GST_CAT_DEBUG (GST_CAT_CAPS,
+ "intersecting %" GST_PTR_FORMAT, GST_PAD_TEMPLATE_CAPS (compattempl));
+ GST_CAT_DEBUG (GST_CAT_CAPS,
+ "..and %" GST_PTR_FORMAT, GST_PAD_TEMPLATE_CAPS (padtempl));
+
+ intersection = gst_caps_intersect (GST_PAD_TEMPLATE_CAPS (compattempl),
+ GST_PAD_TEMPLATE_CAPS (padtempl));
+
+ GST_CAT_DEBUG (GST_CAT_CAPS, "caps are %scompatible %" GST_PTR_FORMAT,
+ (intersection ? "" : "not "), intersection);
+
+ if (!gst_caps_is_empty (intersection))
+ newtempl = padtempl;
+ gst_caps_unref (intersection);
+ if (newtempl)
+ break;
+ }
+
+ padlist = g_list_next (padlist);
+ }
+ if (newtempl)
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
+ "Returning new pad template %p", newtempl);
+ else
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "No compatible pad template found");
+
+ return newtempl;
+}
+
+static GstPad *
+gst_element_request_pad (GstElement * element, GstPadTemplate * templ,
+ const gchar * name)
+{
+ GstPad *newpad = NULL;
+ GstElementClass *oclass;
+
+ oclass = GST_ELEMENT_GET_CLASS (element);
+
+ if (oclass->request_new_pad)
+ newpad = (oclass->request_new_pad) (element, templ, name);
+
+ if (newpad)
+ gst_object_ref (newpad);
+
+ return newpad;
+}
+
+
+
+/**
+ * gst_element_get_pad_from_template:
+ * @element: a #GstElement.
+ * @templ: a #GstPadTemplate belonging to @element.
+ *
+ * Gets a pad from @element described by @templ. If the presence of @templ is
+ * #GST_PAD_REQUEST, requests a new pad. Can return %NULL for #GST_PAD_SOMETIMES
+ * templates.
+ *
+ * Returns: the #GstPad, or NULL if one could not be found or created.
+ */
+static GstPad *
+gst_element_get_pad_from_template (GstElement * element, GstPadTemplate * templ)
+{
+ GstPad *ret = NULL;
+ GstPadPresence presence;
+
+ /* If this function is ever exported, we need check the validity of `element'
+ * and `templ', and to make sure the template actually belongs to the
+ * element. */
+
+ presence = GST_PAD_TEMPLATE_PRESENCE (templ);
+
+ switch (presence) {
+ case GST_PAD_ALWAYS:
+ case GST_PAD_SOMETIMES:
+ ret = gst_element_get_static_pad (element, templ->name_template);
+ if (!ret && presence == GST_PAD_ALWAYS)
+ g_warning
+ ("Element %s has an ALWAYS template %s, but no pad of the same name",
+ GST_OBJECT_NAME (element), templ->name_template);
+ break;
+
+ case GST_PAD_REQUEST:
+ ret = gst_element_request_pad (element, templ, NULL);
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * gst_element_request_compatible_pad:
+ * @element: a #GstElement.
+ * @templ: the #GstPadTemplate to which the new pad should be able to link.
+ *
+ * Requests a pad from @element. The returned pad should be unlinked and
+ * compatible with @templ. Might return an existing pad, or request a new one.
+ *
+ * Returns: a #GstPad, or %NULL if one could not be found or created.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstPad *
+gst_element_request_compatible_pad (GstElement * element,
+ GstPadTemplate * templ)
+{
+ GstPadTemplate *templ_new;
+ GstPad *pad = NULL;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+ g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
+
+ /* FIXME: should really loop through the templates, testing each for
+ * compatibility and pad availability. */
+ templ_new = gst_element_get_compatible_pad_template (element, templ);
+ if (templ_new)
+ pad = gst_element_get_pad_from_template (element, templ_new);
+
+ /* This can happen for non-request pads. No need to unref. */
+ if (pad && GST_PAD_PEER (pad))
+ pad = NULL;
+
+ return pad;
+}
+
+/**
+ * gst_element_get_compatible_pad:
+ * @element: a #GstElement in which the pad should be found.
+ * @pad: the #GstPad to find a compatible one for.
+ * @caps: the #GstCaps to use as a filter.
+ *
+ * Looks for an unlinked pad to which the given pad can link. It is not
+ * guaranteed that linking the pads will work, though it should work in most
+ * cases.
+ *
+ * Returns: the #GstPad to which a link can be made, or %NULL if one cannot be
+ * found. gst_object_unref() after usage.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstPad *
+gst_element_get_compatible_pad (GstElement * element, GstPad * pad,
+ const GstCaps * caps)
+{
+ GstIterator *pads;
+ GstPadTemplate *templ;
+ GstCaps *templcaps;
+ GstPad *foundpad = NULL;
+ gboolean done;
+
+ /* FIXME check for caps compatibility */
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), NULL);
+ g_return_val_if_fail (GST_IS_PAD (pad), NULL);
+
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
+ "finding pad in %s compatible with %s:%s",
+ GST_ELEMENT_NAME (element), GST_DEBUG_PAD_NAME (pad));
+
+ g_return_val_if_fail (GST_PAD_PEER (pad) == NULL, NULL);
+
+ done = FALSE;
+ /* try to get an existing unlinked pad */
+ pads = gst_element_iterate_pads (element);
+ while (!done) {
+ gpointer padptr;
+
+ switch (gst_iterator_next (pads, &padptr)) {
+ case GST_ITERATOR_OK:
+ {
+ GstPad *peer;
+ GstPad *current;
+
+ current = GST_PAD (padptr);
+
+ GST_CAT_LOG (GST_CAT_ELEMENT_PADS, "examining pad %s:%s",
+ GST_DEBUG_PAD_NAME (current));
+
+ peer = gst_pad_get_peer (current);
+
+ if (peer == NULL && gst_pad_can_link (pad, current)) {
+
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
+ "found existing unlinked pad %s:%s",
+ GST_DEBUG_PAD_NAME (current));
+
+ gst_iterator_free (pads);
+
+ return current;
+ } else {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "unreffing pads");
+
+ gst_object_unref (current);
+ if (peer)
+ gst_object_unref (peer);
+ }
+ break;
+ }
+ case GST_ITERATOR_DONE:
+ done = TRUE;
+ break;
+ case GST_ITERATOR_RESYNC:
+ gst_iterator_resync (pads);
+ break;
+ case GST_ITERATOR_ERROR:
+ g_assert_not_reached ();
+ break;
+ }
+ }
+ gst_iterator_free (pads);
+
+ /* try to create a new one */
+ /* requesting is a little crazy, we need a template. Let's create one */
+ templcaps = gst_pad_get_caps (pad);
+
+ templ = gst_pad_template_new ((gchar *) GST_PAD_NAME (pad),
+ GST_PAD_DIRECTION (pad), GST_PAD_ALWAYS, templcaps);
+ foundpad = gst_element_request_compatible_pad (element, templ);
+ gst_object_unref (templ);
+
+ if (foundpad) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
+ "found existing request pad %s:%s", GST_DEBUG_PAD_NAME (foundpad));
+ return foundpad;
+ }
+
+ GST_CAT_INFO_OBJECT (GST_CAT_ELEMENT_PADS, element,
+ "Could not find a compatible pad to link to %s:%s",
+ GST_DEBUG_PAD_NAME (pad));
+ return NULL;
+}
+
+/**
+ * gst_element_state_get_name:
+ * @state: a #GstState to get the name of.
+ *
+ * Gets a string representing the given state.
+ *
+ * Returns: a string with the name of the state.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+G_CONST_RETURN gchar *
+gst_element_state_get_name (GstState state)
+{
+ switch (state) {
+#ifdef GST_DEBUG_COLOR
+ case GST_STATE_VOID_PENDING:
+ return "VOID_PENDING";
+ case GST_STATE_NULL:
+ return "\033[01;34mNULL\033[00m";
+ case GST_STATE_READY:
+ return "\033[01;31mREADY\033[00m";
+ case GST_STATE_PLAYING:
+ return "\033[01;32mPLAYING\033[00m";
+ case GST_STATE_PAUSED:
+ return "\033[01;33mPAUSED\033[00m";
+ default:
+ /* This is a memory leak */
+ return g_strdup_printf ("\033[01;35;41mUNKNOWN!\033[00m(%d)", state);
+#else
+ case GST_STATE_VOID_PENDING:
+ return "VOID_PENDING";
+ case GST_STATE_NULL:
+ return "NULL";
+ case GST_STATE_READY:
+ return "READY";
+ case GST_STATE_PLAYING:
+ return "PLAYING";
+ case GST_STATE_PAUSED:
+ return "PAUSED";
+ default:
+ /* This is a memory leak */
+ return g_strdup_printf ("UNKNOWN!(%d)", state);
+#endif
+ }
+}
+
+/**
+ * gst_element_state_change_return_get_name:
+ * @state_ret: a #GstStateChangeReturn to get the name of.
+ *
+ * Gets a string representing the given state change result.
+ *
+ * Returns: a string with the name of the state change result.
+ *
+ * Since: 0.10.11
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+G_CONST_RETURN gchar *
+gst_element_state_change_return_get_name (GstStateChangeReturn state_ret)
+{
+ switch (state_ret) {
+#ifdef GST_DEBUG_COLOR
+ case GST_STATE_CHANGE_FAILURE:
+ return "\033[01;31mFAILURE\033[00m";
+ case GST_STATE_CHANGE_SUCCESS:
+ return "\033[01;32mSUCCESS\033[00m";
+ case GST_STATE_CHANGE_ASYNC:
+ return "\033[01;33mASYNC\033[00m";
+ case GST_STATE_CHANGE_NO_PREROLL:
+ return "\033[01;34mNO_PREROLL\033[00m";
+ default:
+ /* This is a memory leak */
+ return g_strdup_printf ("\033[01;35;41mUNKNOWN!\033[00m(%d)", state_ret);
+#else
+ case GST_STATE_CHANGE_FAILURE:
+ return "FAILURE";
+ case GST_STATE_CHANGE_SUCCESS:
+ return "SUCCESS";
+ case GST_STATE_CHANGE_ASYNC:
+ return "ASYNC";
+ case GST_STATE_CHANGE_NO_PREROLL:
+ return "NO PREROLL";
+ default:
+ /* This is a memory leak */
+ return g_strdup_printf ("UNKNOWN!(%d)", state_ret);
+#endif
+ }
+}
+
+
+/**
+ * gst_element_factory_can_src_caps :
+ * @factory: factory to query
+ * @caps: the caps to check
+ *
+ * Checks if the factory can source the given capability.
+ *
+ * Returns: true if it can src the capabilities
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_factory_can_src_caps (GstElementFactory * factory,
+ const GstCaps * caps)
+{
+ GList *templates;
+
+ g_return_val_if_fail (factory != NULL, FALSE);
+ g_return_val_if_fail (caps != NULL, FALSE);
+
+ templates = factory->staticpadtemplates;
+
+ while (templates) {
+ GstStaticPadTemplate *template = (GstStaticPadTemplate *) templates->data;
+
+ if (template->direction == GST_PAD_SRC) {
+ if (gst_caps_is_always_compatible (gst_static_caps_get (&template->
+ static_caps), caps))
+ return TRUE;
+ }
+ templates = g_list_next (templates);
+ }
+
+ return FALSE;
+}
+
+/**
+ * gst_element_factory_can_sink_caps :
+ * @factory: factory to query
+ * @caps: the caps to check
+ *
+ * Checks if the factory can sink the given capability.
+ *
+ * Returns: true if it can sink the capabilities
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_factory_can_sink_caps (GstElementFactory * factory,
+ const GstCaps * caps)
+{
+ GList *templates;
+
+ g_return_val_if_fail (factory != NULL, FALSE);
+ g_return_val_if_fail (caps != NULL, FALSE);
+
+ templates = factory->staticpadtemplates;
+
+ while (templates) {
+ GstStaticPadTemplate *template = (GstStaticPadTemplate *) templates->data;
+
+ if (template->direction == GST_PAD_SINK) {
+ if (gst_caps_is_always_compatible (caps,
+ gst_static_caps_get (&template->static_caps)))
+ return TRUE;
+ }
+ templates = g_list_next (templates);
+ }
+
+ return FALSE;
+}
+
+
+/* if return val is true, *direct_child is a caller-owned ref on the direct
+ * child of ancestor that is part of object's ancestry */
+static gboolean
+object_has_ancestor (GstObject * object, GstObject * ancestor,
+ GstObject ** direct_child)
+{
+ GstObject *child, *parent;
+
+ if (direct_child)
+ *direct_child = NULL;
+
+ child = gst_object_ref (object);
+ parent = gst_object_get_parent (object);
+
+ while (parent) {
+ if (ancestor == parent) {
+ if (direct_child)
+ *direct_child = child;
+ else
+ gst_object_unref (child);
+ gst_object_unref (parent);
+ return TRUE;
+ }
+
+ gst_object_unref (child);
+ child = parent;
+ parent = gst_object_get_parent (parent);
+ }
+
+ gst_object_unref (child);
+
+ return FALSE;
+}
+
+/* caller owns return */
+static GstObject *
+find_common_root (GstObject * o1, GstObject * o2)
+{
+ GstObject *top = o1;
+ GstObject *kid1, *kid2;
+ GstObject *root = NULL;
+
+ while (GST_OBJECT_PARENT (top))
+ top = GST_OBJECT_PARENT (top);
+
+ /* the itsy-bitsy spider... */
+
+ if (!object_has_ancestor (o2, top, &kid2))
+ return NULL;
+
+ root = gst_object_ref (top);
+ while (TRUE) {
+ if (!object_has_ancestor (o1, kid2, &kid1)) {
+ gst_object_unref (kid2);
+ return root;
+ }
+ root = kid2;
+ if (!object_has_ancestor (o2, kid1, &kid2)) {
+ gst_object_unref (kid1);
+ return root;
+ }
+ root = kid1;
+ }
+}
+
+/* caller does not own return */
+static GstPad *
+ghost_up (GstElement * e, GstPad * pad)
+{
+ static gint ghost_pad_index = 0;
+ GstPad *gpad;
+ gchar *name;
+ GstObject *parent = GST_OBJECT_PARENT (e);
+
+ name = g_strdup_printf ("ghost%d", ghost_pad_index++);
+ gpad = gst_ghost_pad_new (name, pad);
+ g_free (name);
+
+ if (!gst_element_add_pad ((GstElement *) parent, gpad)) {
+ g_warning ("Pad named %s already exists in element %s\n",
+ GST_OBJECT_NAME (gpad), GST_OBJECT_NAME (parent));
+ gst_object_unref ((GstObject *) gpad);
+ return NULL;
+ }
+
+ return gpad;
+}
+
+static void
+remove_pad (gpointer ppad, gpointer unused)
+{
+ GstPad *pad = ppad;
+
+ if (!gst_element_remove_pad ((GstElement *) GST_OBJECT_PARENT (pad), pad))
+ g_warning ("Couldn't remove pad %s from element %s",
+ GST_OBJECT_NAME (pad), GST_OBJECT_NAME (GST_OBJECT_PARENT (pad)));
+}
+
+static gboolean
+prepare_link_maybe_ghosting (GstPad ** src, GstPad ** sink,
+ GSList ** pads_created)
+{
+ GstObject *root;
+ GstObject *e1, *e2;
+ GSList *pads_created_local = NULL;
+
+ g_assert (pads_created);
+
+ e1 = GST_OBJECT_PARENT (*src);
+ e2 = GST_OBJECT_PARENT (*sink);
+
+ if (G_UNLIKELY (e1 == NULL)) {
+ GST_WARNING ("Trying to ghost a pad that doesn't have a parent: %"
+ GST_PTR_FORMAT, *src);
+ return FALSE;
+ }
+ if (G_UNLIKELY (e2 == NULL)) {
+ GST_WARNING ("Trying to ghost a pad that doesn't have a parent: %"
+ GST_PTR_FORMAT, *sink);
+ return FALSE;
+ }
+
+ if (GST_OBJECT_PARENT (e1) == GST_OBJECT_PARENT (e2)) {
+ GST_CAT_INFO (GST_CAT_PADS, "%s and %s in same bin, no need for ghost pads",
+ GST_OBJECT_NAME (e1), GST_OBJECT_NAME (e2));
+ return TRUE;
+ }
+
+ GST_CAT_INFO (GST_CAT_PADS, "%s and %s not in same bin, making ghost pads",
+ GST_OBJECT_NAME (e1), GST_OBJECT_NAME (e2));
+
+ /* we need to setup some ghost pads */
+ root = find_common_root (e1, e2);
+ if (!root) {
+ g_warning ("Trying to connect elements that don't share a common "
+ "ancestor: %s and %s", GST_ELEMENT_NAME (e1), GST_ELEMENT_NAME (e2));
+ return FALSE;
+ }
+
+ while (GST_OBJECT_PARENT (e1) != root) {
+ *src = ghost_up ((GstElement *) e1, *src);
+ if (!*src)
+ goto cleanup_fail;
+ e1 = GST_OBJECT_PARENT (*src);
+ pads_created_local = g_slist_prepend (pads_created_local, *src);
+ }
+ while (GST_OBJECT_PARENT (e2) != root) {
+ *sink = ghost_up ((GstElement *) e2, *sink);
+ if (!*sink)
+ goto cleanup_fail;
+ e2 = GST_OBJECT_PARENT (*sink);
+ pads_created_local = g_slist_prepend (pads_created_local, *sink);
+ }
+
+ gst_object_unref (root);
+ *pads_created = g_slist_concat (*pads_created, pads_created_local);
+ return TRUE;
+
+cleanup_fail:
+ gst_object_unref (root);
+ g_slist_foreach (pads_created_local, remove_pad, NULL);
+ g_slist_free (pads_created_local);
+ return FALSE;
+}
+
+static gboolean
+pad_link_maybe_ghosting (GstPad * src, GstPad * sink)
+{
+ GSList *pads_created = NULL;
+ gboolean ret;
+
+ if (!prepare_link_maybe_ghosting (&src, &sink, &pads_created)) {
+ ret = FALSE;
+ } else {
+ ret = (gst_pad_link (src, sink) == GST_PAD_LINK_OK);
+ }
+
+ if (!ret) {
+ g_slist_foreach (pads_created, remove_pad, NULL);
+ }
+ g_slist_free (pads_created);
+
+ return ret;
+}
+
+/**
+ * gst_element_link_pads:
+ * @src: a #GstElement containing the source pad.
+ * @srcpadname: the name of the #GstPad in source element or NULL for any pad.
+ * @dest: the #GstElement containing the destination pad.
+ * @destpadname: the name of the #GstPad in destination element,
+ * or NULL for any pad.
+ *
+ * Links the two named pads of the source and destination elements.
+ * Side effect is that if one of the pads has no parent, it becomes a
+ * child of the parent of the other element. If they have different
+ * parents, the link fails.
+ *
+ * Returns: TRUE if the pads could be linked, FALSE otherwise.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_link_pads (GstElement * src, const gchar * srcpadname,
+ GstElement * dest, const gchar * destpadname)
+{
+ const GList *srcpads, *destpads, *srctempls, *desttempls, *l;
+ GstPad *srcpad, *destpad;
+ GstPadTemplate *srctempl, *desttempl;
+ GstElementClass *srcclass, *destclass;
+
+ /* checks */
+ g_return_val_if_fail (GST_IS_ELEMENT (src), FALSE);
+ g_return_val_if_fail (GST_IS_ELEMENT (dest), FALSE);
+
+ srcclass = GST_ELEMENT_GET_CLASS (src);
+ destclass = GST_ELEMENT_GET_CLASS (dest);
+
+ GST_CAT_INFO (GST_CAT_ELEMENT_PADS,
+ "trying to link element %s:%s to element %s:%s", GST_ELEMENT_NAME (src),
+ srcpadname ? srcpadname : "(any)", GST_ELEMENT_NAME (dest),
+ destpadname ? destpadname : "(any)");
+
+ /* get a src pad */
+ if (srcpadname) {
+ /* name specified, look it up */
+ srcpad = gst_element_get_pad (src, srcpadname);
+ if (!srcpad) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no pad %s:%s",
+ GST_ELEMENT_NAME (src), srcpadname);
+ return FALSE;
+ } else {
+ if (!(GST_PAD_DIRECTION (srcpad) == GST_PAD_SRC)) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is no src pad",
+ GST_DEBUG_PAD_NAME (srcpad));
+ gst_object_unref (srcpad);
+ return FALSE;
+ }
+ if (GST_PAD_PEER (srcpad) != NULL) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is already linked",
+ GST_DEBUG_PAD_NAME (srcpad));
+ gst_object_unref (srcpad);
+ return FALSE;
+ }
+ }
+ srcpads = NULL;
+ } else {
+ /* no name given, get the first available pad */
+ GST_OBJECT_LOCK (src);
+ srcpads = GST_ELEMENT_PADS (src);
+ srcpad = srcpads ? GST_PAD_CAST (srcpads->data) : NULL;
+ if (srcpad)
+ gst_object_ref (srcpad);
+ GST_OBJECT_UNLOCK (src);
+ }
+
+ /* get a destination pad */
+ if (destpadname) {
+ /* name specified, look it up */
+ destpad = gst_element_get_pad (dest, destpadname);
+ if (!destpad) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no pad %s:%s",
+ GST_ELEMENT_NAME (dest), destpadname);
+ return FALSE;
+ } else {
+ if (!(GST_PAD_DIRECTION (destpad) == GST_PAD_SINK)) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is no sink pad",
+ GST_DEBUG_PAD_NAME (destpad));
+ gst_object_unref (destpad);
+ return FALSE;
+ }
+ if (GST_PAD_PEER (destpad) != NULL) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is already linked",
+ GST_DEBUG_PAD_NAME (destpad));
+ gst_object_unref (destpad);
+ return FALSE;
+ }
+ }
+ destpads = NULL;
+ } else {
+ /* no name given, get the first available pad */
+ GST_OBJECT_LOCK (dest);
+ destpads = GST_ELEMENT_PADS (dest);
+ destpad = destpads ? GST_PAD_CAST (destpads->data) : NULL;
+ if (destpad)
+ gst_object_ref (destpad);
+ GST_OBJECT_UNLOCK (dest);
+ }
+
+ if (srcpadname && destpadname) {
+ gboolean result;
+
+ /* two explicitly specified pads */
+ result = pad_link_maybe_ghosting (srcpad, destpad);
+
+ gst_object_unref (srcpad);
+ gst_object_unref (destpad);
+
+ return result;
+ }
+
+ if (srcpad) {
+ /* loop through the allowed pads in the source, trying to find a
+ * compatible destination pad */
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
+ "looping through allowed src and dest pads");
+ do {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "trying src pad %s:%s",
+ GST_DEBUG_PAD_NAME (srcpad));
+ if ((GST_PAD_DIRECTION (srcpad) == GST_PAD_SRC) &&
+ (GST_PAD_PEER (srcpad) == NULL)) {
+ GstPad *temp;
+
+ if (destpadname) {
+ temp = destpad;
+ gst_object_ref (temp);
+ } else {
+ temp = gst_element_get_compatible_pad (dest, srcpad, NULL);
+ }
+
+ if (temp && pad_link_maybe_ghosting (srcpad, temp)) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "linked pad %s:%s to pad %s:%s",
+ GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (temp));
+ if (destpad)
+ gst_object_unref (destpad);
+ gst_object_unref (srcpad);
+ gst_object_unref (temp);
+ return TRUE;
+ }
+
+ if (temp) {
+ gst_object_unref (temp);
+ }
+ }
+ /* find a better way for this mess */
+ if (srcpads) {
+ srcpads = g_list_next (srcpads);
+ if (srcpads) {
+ gst_object_unref (srcpad);
+ srcpad = GST_PAD_CAST (srcpads->data);
+ gst_object_ref (srcpad);
+ }
+ }
+ } while (srcpads);
+ }
+ if (srcpadname) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no link possible from %s:%s to %s",
+ GST_DEBUG_PAD_NAME (srcpad), GST_ELEMENT_NAME (dest));
+ if (destpad)
+ gst_object_unref (destpad);
+ destpad = NULL;
+ }
+ if (srcpad)
+ gst_object_unref (srcpad);
+ srcpad = NULL;
+
+ if (destpad) {
+ /* loop through the existing pads in the destination */
+ do {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "trying dest pad %s:%s",
+ GST_DEBUG_PAD_NAME (destpad));
+ if ((GST_PAD_DIRECTION (destpad) == GST_PAD_SINK) &&
+ (GST_PAD_PEER (destpad) == NULL)) {
+ GstPad *temp = gst_element_get_compatible_pad (src, destpad, NULL);
+
+ if (temp && pad_link_maybe_ghosting (temp, destpad)) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "linked pad %s:%s to pad %s:%s",
+ GST_DEBUG_PAD_NAME (temp), GST_DEBUG_PAD_NAME (destpad));
+ gst_object_unref (temp);
+ gst_object_unref (destpad);
+ return TRUE;
+ }
+ if (temp) {
+ gst_object_unref (temp);
+ }
+ }
+ if (destpads) {
+ destpads = g_list_next (destpads);
+ if (destpads) {
+ gst_object_unref (destpad);
+ destpad = GST_PAD_CAST (destpads->data);
+ gst_object_ref (destpad);
+ }
+ }
+ } while (destpads);
+ }
+
+ if (destpadname) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no link possible from %s to %s:%s",
+ GST_ELEMENT_NAME (src), GST_DEBUG_PAD_NAME (destpad));
+ gst_object_unref (destpad);
+ return FALSE;
+ } else {
+ if (destpad)
+ gst_object_unref (destpad);
+ destpad = NULL;
+ }
+
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
+ "we might have request pads on both sides, checking...");
+ srctempls = gst_element_class_get_pad_template_list (srcclass);
+ desttempls = gst_element_class_get_pad_template_list (destclass);
+
+ if (srctempls && desttempls) {
+ while (srctempls) {
+ srctempl = (GstPadTemplate *) srctempls->data;
+ if (srctempl->presence == GST_PAD_REQUEST) {
+ for (l = desttempls; l; l = l->next) {
+ desttempl = (GstPadTemplate *) l->data;
+ if (desttempl->presence == GST_PAD_REQUEST &&
+ desttempl->direction != srctempl->direction) {
+ if (gst_caps_is_always_compatible (gst_pad_template_get_caps
+ (srctempl), gst_pad_template_get_caps (desttempl))) {
+ srcpad =
+ gst_element_get_request_pad (src, srctempl->name_template);
+ destpad =
+ gst_element_get_request_pad (dest, desttempl->name_template);
+ if (srcpad && destpad
+ && pad_link_maybe_ghosting (srcpad, destpad)) {
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
+ "linked pad %s:%s to pad %s:%s",
+ GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
+ gst_object_unref (srcpad);
+ gst_object_unref (destpad);
+ return TRUE;
+ }
+ /* it failed, so we release the request pads */
+ if (srcpad)
+ gst_element_release_request_pad (src, srcpad);
+ if (destpad)
+ gst_element_release_request_pad (dest, destpad);
+ }
+ }
+ }
+ }
+ srctempls = srctempls->next;
+ }
+ }
+
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "no link possible from %s to %s",
+ GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (dest));
+ return FALSE;
+}
+
+/**
+ * gst_element_link_pads_filtered:
+ * @src: a #GstElement containing the source pad.
+ * @srcpadname: the name of the #GstPad in source element or NULL for any pad.
+ * @dest: the #GstElement containing the destination pad.
+ * @destpadname: the name of the #GstPad in destination element or NULL for any pad.
+ * @filter: the #GstCaps to filter the link, or #NULL for no filter.
+ *
+ * Links the two named pads of the source and destination elements. Side effect
+ * is that if one of the pads has no parent, it becomes a child of the parent of
+ * the other element. If they have different parents, the link fails. If @caps
+ * is not #NULL, makes sure that the caps of the link is a subset of @caps.
+ *
+ * Returns: TRUE if the pads could be linked, FALSE otherwise.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_link_pads_filtered (GstElement * src, const gchar * srcpadname,
+ GstElement * dest, const gchar * destpadname, GstCaps * filter)
+{
+ /* checks */
+ g_return_val_if_fail (GST_IS_ELEMENT (src), FALSE);
+ g_return_val_if_fail (GST_IS_ELEMENT (dest), FALSE);
+ g_return_val_if_fail (filter == NULL || GST_IS_CAPS (filter), FALSE);
+
+ if (filter) {
+ GstElement *capsfilter;
+ GstObject *parent;
+ GstState state, pending;
+
+ capsfilter = gst_element_factory_make ("capsfilter", NULL);
+ if (!capsfilter) {
+ GST_ERROR ("Could not make a capsfilter");
+ return FALSE;
+ }
+
+ parent = gst_object_get_parent (GST_OBJECT (src));
+ g_return_val_if_fail (GST_IS_BIN (parent), FALSE);
+
+ gst_element_get_state (GST_ELEMENT_CAST (parent), &state, &pending, 0);
+
+ if (!gst_bin_add (GST_BIN (parent), capsfilter)) {
+ GST_ERROR ("Could not add capsfilter");
+ gst_object_unref (capsfilter);
+ gst_object_unref (parent);
+ return FALSE;
+ }
+
+ if (pending != GST_STATE_VOID_PENDING)
+ state = pending;
+
+ gst_element_set_state (capsfilter, state);
+
+ gst_object_unref (parent);
+
+ g_object_set (capsfilter, "caps", filter, NULL);
+
+ if (gst_element_link_pads (src, srcpadname, capsfilter, "sink")
+ && gst_element_link_pads (capsfilter, "src", dest, destpadname)) {
+ return TRUE;
+ } else {
+ GST_INFO ("Could not link elements");
+ gst_element_set_state (capsfilter, GST_STATE_NULL);
+ /* this will unlink and unref as appropriate */
+ gst_bin_remove (GST_BIN (GST_OBJECT_PARENT (capsfilter)), capsfilter);
+ return FALSE;
+ }
+ } else {
+ return gst_element_link_pads (src, srcpadname, dest, destpadname);
+ }
+}
+
+/**
+ * gst_element_link:
+ * @src: a #GstElement containing the source pad.
+ * @dest: the #GstElement containing the destination pad.
+ *
+ * Links @src to @dest. The link must be from source to
+ * destination; the other direction will not be tried. The function looks for
+ * existing pads that aren't linked yet. It will request new pads if necessary.
+ * Such pads need to be released manualy when unlinking.
+ * If multiple links are possible, only one is established.
+ *
+ * Make sure you have added your elements to a bin or pipeline with
+ * gst_bin_add() before trying to link them.
+ *
+ * Returns: TRUE if the elements could be linked, FALSE otherwise.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_link (GstElement * src, GstElement * dest)
+{
+ return gst_element_link_pads_filtered (src, NULL, dest, NULL, NULL);
+}
+
+/**
+ * gst_element_link_many:
+ * @element_1: the first #GstElement in the link chain.
+ * @element_2: the second #GstElement in the link chain.
+ * @...: the NULL-terminated list of elements to link in order.
+ *
+ * Chain together a series of elements. Uses gst_element_link().
+ * Make sure you have added your elements to a bin or pipeline with
+ * gst_bin_add() before trying to link them.
+ *
+ * Returns: TRUE on success, FALSE otherwise.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_link_many (GstElement * element_1, GstElement * element_2, ...)
+{
+ va_list args;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element_1), FALSE);
+ g_return_val_if_fail (GST_IS_ELEMENT (element_2), FALSE);
+
+ va_start (args, element_2);
+
+ while (element_2) {
+ if (!gst_element_link (element_1, element_2))
+ return FALSE;
+
+ element_1 = element_2;
+ element_2 = va_arg (args, GstElement *);
+ }
+
+ va_end (args);
+
+ return TRUE;
+}
+
+/**
+ * gst_element_link_filtered:
+ * @src: a #GstElement containing the source pad.
+ * @dest: the #GstElement containing the destination pad.
+ * @filter: the #GstCaps to filter the link, or #NULL for no filter.
+ *
+ * Links @src to @dest using the given caps as filtercaps.
+ * The link must be from source to
+ * destination; the other direction will not be tried. The function looks for
+ * existing pads that aren't linked yet. It will request new pads if necessary.
+ * If multiple links are possible, only one is established.
+ *
+ * Make sure you have added your elements to a bin or pipeline with
+ * gst_bin_add() before trying to link them.
+ *
+ * Returns: TRUE if the pads could be linked, FALSE otherwise.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_link_filtered (GstElement * src, GstElement * dest,
+ GstCaps * filter)
+{
+ return gst_element_link_pads_filtered (src, NULL, dest, NULL, filter);
+}
+
+/**
+ * gst_element_unlink_pads:
+ * @src: a #GstElement containing the source pad.
+ * @srcpadname: the name of the #GstPad in source element.
+ * @dest: a #GstElement containing the destination pad.
+ * @destpadname: the name of the #GstPad in destination element.
+ *
+ * Unlinks the two named pads of the source and destination elements.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_unlink_pads (GstElement * src, const gchar * srcpadname,
+ GstElement * dest, const gchar * destpadname)
+{
+ GstPad *srcpad, *destpad;
+
+ g_return_if_fail (src != NULL);
+ g_return_if_fail (GST_IS_ELEMENT (src));
+ g_return_if_fail (srcpadname != NULL);
+ g_return_if_fail (dest != NULL);
+ g_return_if_fail (GST_IS_ELEMENT (dest));
+ g_return_if_fail (destpadname != NULL);
+
+ /* obtain the pads requested */
+ srcpad = gst_element_get_pad (src, srcpadname);
+ if (srcpad == NULL) {
+ GST_WARNING_OBJECT (src, "source element has no pad \"%s\"", srcpadname);
+ return;
+ }
+ destpad = gst_element_get_pad (dest, destpadname);
+ if (destpad == NULL) {
+ GST_WARNING_OBJECT (dest, "destination element has no pad \"%s\"",
+ destpadname);
+ gst_object_unref (srcpad);
+ return;
+ }
+
+ /* we're satisified they can be unlinked, let's do it */
+ gst_pad_unlink (srcpad, destpad);
+ gst_object_unref (srcpad);
+ gst_object_unref (destpad);
+}
+
+/**
+ * gst_element_unlink_many:
+ * @element_1: the first #GstElement in the link chain.
+ * @element_2: the second #GstElement in the link chain.
+ * @...: the NULL-terminated list of elements to unlink in order.
+ *
+ * Unlinks a series of elements. Uses gst_element_unlink().
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_unlink_many (GstElement * element_1, GstElement * element_2, ...)
+{
+ va_list args;
+
+ g_return_if_fail (element_1 != NULL && element_2 != NULL);
+ g_return_if_fail (GST_IS_ELEMENT (element_1) && GST_IS_ELEMENT (element_2));
+
+ va_start (args, element_2);
+
+ while (element_2) {
+ gst_element_unlink (element_1, element_2);
+
+ element_1 = element_2;
+ element_2 = va_arg (args, GstElement *);
+ }
+
+ va_end (args);
+}
+
+/**
+ * gst_element_unlink:
+ * @src: the source #GstElement to unlink.
+ * @dest: the sink #GstElement to unlink.
+ *
+ * Unlinks all source pads of the source element with all sink pads
+ * of the sink element to which they are linked.
+ *
+ * If the link has been made using gst_element_link(), it could have created an
+ * requestpad, which has to be released using gst_element_release_request_pad().
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_unlink (GstElement * src, GstElement * dest)
+{
+ GstIterator *pads;
+ gboolean done = FALSE;
+
+ g_return_if_fail (GST_IS_ELEMENT (src));
+ g_return_if_fail (GST_IS_ELEMENT (dest));
+
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS, "unlinking \"%s\" and \"%s\"",
+ GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (dest));
+
+ pads = gst_element_iterate_pads (src);
+ while (!done) {
+ gpointer data;
+
+ switch (gst_iterator_next (pads, &data)) {
+ case GST_ITERATOR_OK:
+ {
+ GstPad *pad = GST_PAD_CAST (data);
+
+ if (GST_PAD_IS_SRC (pad)) {
+ GstPad *peerpad = gst_pad_get_peer (pad);
+
+ /* see if the pad is connected and is really a pad
+ * of dest */
+ if (peerpad) {
+ GstElement *peerelem;
+
+ peerelem = gst_pad_get_parent_element (peerpad);
+
+ if (peerelem == dest) {
+ gst_pad_unlink (pad, peerpad);
+ }
+ if (peerelem)
+ gst_object_unref (peerelem);
+
+ gst_object_unref (peerpad);
+ }
+ }
+ gst_object_unref (pad);
+ break;
+ }
+ case GST_ITERATOR_RESYNC:
+ gst_iterator_resync (pads);
+ break;
+ case GST_ITERATOR_DONE:
+ done = TRUE;
+ break;
+ default:
+ g_assert_not_reached ();
+ break;
+ }
+ }
+ gst_iterator_free (pads);
+}
+
+/**
+ * gst_element_query_position:
+ * @element: a #GstElement to invoke the position query on.
+ * @format: a pointer to the #GstFormat asked for.
+ * On return contains the #GstFormat used.
+ * @cur: A location in which to store the current position, or NULL.
+ *
+ * Queries an element for the stream position.
+ *
+ * Returns: TRUE if the query could be performed.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_query_position (GstElement * element, GstFormat * format,
+ gint64 * cur)
+{
+ GstQuery *query;
+ gboolean ret;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+ g_return_val_if_fail (format != NULL, FALSE);
+
+ query = gst_query_new_position (*format);
+ ret = gst_element_query (element, query);
+
+ if (ret)
+ gst_query_parse_position (query, format, cur);
+
+ gst_query_unref (query);
+
+ return ret;
+}
+
+/**
+ * gst_element_query_duration:
+ * @element: a #GstElement to invoke the duration query on.
+ * @format: a pointer to the #GstFormat asked for.
+ * On return contains the #GstFormat used.
+ * @duration: A location in which to store the total duration, or NULL.
+ *
+ * Queries an element for the total stream duration.
+ *
+ * Returns: TRUE if the query could be performed.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_query_duration (GstElement * element, GstFormat * format,
+ gint64 * duration)
+{
+ GstQuery *query;
+ gboolean ret;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+ g_return_val_if_fail (format != NULL, FALSE);
+
+ query = gst_query_new_duration (*format);
+ ret = gst_element_query (element, query);
+
+ if (ret)
+ gst_query_parse_duration (query, format, duration);
+
+ gst_query_unref (query);
+
+ return ret;
+}
+
+/**
+ * gst_element_query_convert:
+ * @element: a #GstElement to invoke the convert query on.
+ * @src_format: a #GstFormat to convert from.
+ * @src_val: a value to convert.
+ * @dest_format: a pointer to the #GstFormat to convert to.
+ * @dest_val: a pointer to the result.
+ *
+ * Queries an element to convert @src_val in @src_format to @dest_format.
+ *
+ * Returns: TRUE if the query could be performed.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_query_convert (GstElement * element, GstFormat src_format,
+ gint64 src_val, GstFormat * dest_format, gint64 * dest_val)
+{
+ GstQuery *query;
+ gboolean ret;
+
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+ g_return_val_if_fail (dest_format != NULL, FALSE);
+ g_return_val_if_fail (dest_val != NULL, FALSE);
+
+ if (*dest_format == src_format) {
+ *dest_val = src_val;
+ return TRUE;
+ }
+
+ query = gst_query_new_convert (src_format, src_val, *dest_format);
+ ret = gst_element_query (element, query);
+
+ if (ret)
+ gst_query_parse_convert (query, NULL, NULL, dest_format, dest_val);
+
+ gst_query_unref (query);
+
+ return ret;
+}
+
+/**
+ * gst_element_seek_simple
+ * @element: a #GstElement to seek on
+ * @format: a #GstFormat to execute the seek in, such as #GST_FORMAT_TIME
+ * @seek_flags: seek options; playback applications will usually want to use
+ * GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT here
+ * @seek_pos: position to seek to (relative to the start); if you are doing
+ * a seek in #GST_FORMAT_TIME this value is in nanoseconds -
+ * multiply with #GST_SECOND to convert seconds to nanoseconds or
+ * with #GST_MSECOND to convert milliseconds to nanoseconds.
+ *
+ * Simple API to perform a seek on the given element, meaning it just seeks
+ * to the given position relative to the start of the stream. For more complex
+ * operations like segment seeks (e.g. for looping) or changing the playback
+ * rate or seeking relative to the last configured playback segment you should
+ * use gst_element_seek().
+ *
+ * In a completely prerolled PAUSED or PLAYING pipeline, seeking is always
+ * guaranteed to return %TRUE on a seekable media type or %FALSE when the media
+ * type is certainly not seekable (such as a live stream).
+ *
+ * Some elements allow for seeking in the READY state, in this
+ * case they will store the seek event and execute it when they are put to
+ * PAUSED. If the element supports seek in READY, it will always return %TRUE when
+ * it receives the event in the READY state.
+ *
+ * Returns: %TRUE if the seek operation succeeded (the seek might not always be
+ * executed instantly though)
+ *
+ * Since: 0.10.7
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_element_seek_simple (GstElement * element, GstFormat format,
+ GstSeekFlags seek_flags, gint64 seek_pos)
+{
+ g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
+ g_return_val_if_fail (seek_pos >= 0, FALSE);
+
+ return gst_element_seek (element, 1.0, format, seek_flags,
+ GST_SEEK_TYPE_SET, seek_pos, GST_SEEK_TYPE_NONE, 0);
+}
+
+/**
+ * gst_pad_can_link:
+ * @srcpad: the source #GstPad to link.
+ * @sinkpad: the sink #GstPad to link.
+ *
+ * Checks if the source pad and the sink pad can be linked.
+ * Both @srcpad and @sinkpad must be unlinked.
+ *
+ * Returns: TRUE if the pads can be linked, FALSE otherwise.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_pad_can_link (GstPad * srcpad, GstPad * sinkpad)
+{
+ /* FIXME This function is gross. It's almost a direct copy of
+ * gst_pad_link_filtered(). Any decent programmer would attempt
+ * to merge the two functions, which I will do some day. --ds
+ */
+
+ /* generic checks */
+ g_return_val_if_fail (GST_IS_PAD (srcpad), FALSE);
+ g_return_val_if_fail (GST_IS_PAD (sinkpad), FALSE);
+
+ GST_CAT_INFO (GST_CAT_PADS, "trying to link %s:%s and %s:%s",
+ GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (sinkpad));
+
+ /* FIXME: shouldn't we convert this to g_return_val_if_fail? */
+ if (GST_PAD_PEER (srcpad) != NULL) {
+ GST_CAT_INFO (GST_CAT_PADS, "Source pad %s:%s has a peer, failed",
+ GST_DEBUG_PAD_NAME (srcpad));
+ return FALSE;
+ }
+ if (GST_PAD_PEER (sinkpad) != NULL) {
+ GST_CAT_INFO (GST_CAT_PADS, "Sink pad %s:%s has a peer, failed",
+ GST_DEBUG_PAD_NAME (sinkpad));
+ return FALSE;
+ }
+ if (!GST_PAD_IS_SRC (srcpad)) {
+ GST_CAT_INFO (GST_CAT_PADS, "Src pad %s:%s is not source pad, failed",
+ GST_DEBUG_PAD_NAME (srcpad));
+ return FALSE;
+ }
+ if (!GST_PAD_IS_SINK (sinkpad)) {
+ GST_CAT_INFO (GST_CAT_PADS, "Sink pad %s:%s is not sink pad, failed",
+ GST_DEBUG_PAD_NAME (sinkpad));
+ return FALSE;
+ }
+ if (GST_PAD_PARENT (srcpad) == NULL) {
+ GST_CAT_INFO (GST_CAT_PADS, "Src pad %s:%s has no parent, failed",
+ GST_DEBUG_PAD_NAME (srcpad));
+ return FALSE;
+ }
+ if (GST_PAD_PARENT (sinkpad) == NULL) {
+ GST_CAT_INFO (GST_CAT_PADS, "Sink pad %s:%s has no parent, failed",
+ GST_DEBUG_PAD_NAME (srcpad));
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/**
+ * gst_pad_use_fixed_caps:
+ * @pad: the pad to use
+ *
+ * A helper function you can use that sets the
+ * @gst_pad_get_fixed_caps_func as the getcaps function for the
+ * pad. This way the function will always return the negotiated caps
+ * or in case the pad is not negotiated, the padtemplate caps.
+ *
+ * Use this function on a pad that, once _set_caps() has been called
+ * on it, cannot be renegotiated to something else.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_pad_use_fixed_caps (GstPad * pad)
+{
+ gst_pad_set_getcaps_function (pad, gst_pad_get_fixed_caps_func);
+}
+
+/**
+ * gst_pad_get_fixed_caps_func:
+ * @pad: the pad to use
+ *
+ * A helper function you can use as a GetCaps function that
+ * will return the currently negotiated caps or the padtemplate
+ * when NULL.
+ *
+ * Returns: The currently negotiated caps or the padtemplate.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstCaps *
+gst_pad_get_fixed_caps_func (GstPad * pad)
+{
+ GstCaps *result;
+
+ g_return_val_if_fail (GST_IS_PAD (pad), NULL);
+
+ GST_OBJECT_LOCK (pad);
+ if (GST_PAD_CAPS (pad)) {
+ result = GST_PAD_CAPS (pad);
+
+ GST_CAT_DEBUG (GST_CAT_CAPS,
+ "using pad caps %p %" GST_PTR_FORMAT, result, result);
+
+ result = gst_caps_ref (result);
+ goto done;
+ }
+ if (GST_PAD_PAD_TEMPLATE (pad)) {
+ GstPadTemplate *templ = GST_PAD_PAD_TEMPLATE (pad);
+
+ result = GST_PAD_TEMPLATE_CAPS (templ);
+ GST_CAT_DEBUG (GST_CAT_CAPS,
+ "using pad template %p with caps %p %" GST_PTR_FORMAT, templ, result,
+ result);
+
+ result = gst_caps_ref (result);
+ goto done;
+ }
+ GST_CAT_DEBUG (GST_CAT_CAPS, "pad has no caps");
+ result = gst_caps_new_empty ();
+
+done:
+ GST_OBJECT_UNLOCK (pad);
+
+ return result;
+}
+
+/**
+ * gst_pad_get_parent_element:
+ * @pad: a pad
+ *
+ * Gets the parent of @pad, cast to a #GstElement. If a @pad has no parent or
+ * its parent is not an element, return NULL.
+ *
+ * Returns: The parent of the pad. The caller has a reference on the parent, so
+ * unref when you're finished with it.
+ *
+ * MT safe.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstElement *
+gst_pad_get_parent_element (GstPad * pad)
+{
+ GstObject *p;
+
+ g_return_val_if_fail (GST_IS_PAD (pad), NULL);
+
+ p = gst_object_get_parent (GST_OBJECT_CAST (pad));
+
+ if (p && !GST_IS_ELEMENT (p)) {
+ gst_object_unref (p);
+ p = NULL;
+ }
+ return GST_ELEMENT_CAST (p);
+}
+
+/**
+ * gst_object_default_error:
+ * @source: the #GstObject that initiated the error.
+ * @error: the GError.
+ * @debug: an additional debug information string, or NULL.
+ *
+ * A default error function.
+ *
+ * The default handler will simply print the error string using g_print.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_object_default_error (GstObject * source, GError * error, gchar * debug)
+{
+ gchar *name = gst_object_get_path_string (source);
+
+ g_print (_("ERROR: from element %s: %s\n"), name, error->message);
+ if (debug)
+ g_print (_("Additional debug info:\n%s\n"), debug);
+
+ g_free (name);
+}
+
+/**
+ * gst_bin_add_many:
+ * @bin: a #GstBin
+ * @element_1: the #GstElement element to add to the bin
+ * @...: additional elements to add to the bin
+ *
+ * Adds a NULL-terminated list of elements to a bin. This function is
+ * equivalent to calling gst_bin_add() for each member of the list. The return
+ * value of each gst_bin_add() is ignored.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_bin_add_many (GstBin * bin, GstElement * element_1, ...)
+{
+ va_list args;
+
+ g_return_if_fail (GST_IS_BIN (bin));
+ g_return_if_fail (GST_IS_ELEMENT (element_1));
+
+ va_start (args, element_1);
+
+ while (element_1) {
+ gst_bin_add (bin, element_1);
+
+ element_1 = va_arg (args, GstElement *);
+ }
+
+ va_end (args);
+}
+
+/**
+ * gst_bin_remove_many:
+ * @bin: a #GstBin
+ * @element_1: the first #GstElement to remove from the bin
+ * @...: NULL-terminated list of elements to remove from the bin
+ *
+ * Remove a list of elements from a bin. This function is equivalent
+ * to calling gst_bin_remove() with each member of the list.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_bin_remove_many (GstBin * bin, GstElement * element_1, ...)
+{
+ va_list args;
+
+ g_return_if_fail (GST_IS_BIN (bin));
+ g_return_if_fail (GST_IS_ELEMENT (element_1));
+
+ va_start (args, element_1);
+
+ while (element_1) {
+ gst_bin_remove (bin, element_1);
+
+ element_1 = va_arg (args, GstElement *);
+ }
+
+ va_end (args);
+}
+
+static void
+gst_element_populate_std_props (GObjectClass * klass, const gchar * prop_name,
+ guint arg_id, GParamFlags flags)
+{
+ GQuark prop_id = g_quark_from_string (prop_name);
+ GParamSpec *pspec;
+
+ static GQuark fd_id = 0;
+ static GQuark blocksize_id;
+ static GQuark bytesperread_id;
+ static GQuark dump_id;
+ static GQuark filesize_id;
+ static GQuark mmapsize_id;
+ static GQuark location_id;
+ static GQuark offset_id;
+ static GQuark silent_id;
+ static GQuark touch_id;
+
+ if (!fd_id) {
+ fd_id = g_quark_from_static_string ("fd");
+ blocksize_id = g_quark_from_static_string ("blocksize");
+ bytesperread_id = g_quark_from_static_string ("bytesperread");
+ dump_id = g_quark_from_static_string ("dump");
+ filesize_id = g_quark_from_static_string ("filesize");
+ mmapsize_id = g_quark_from_static_string ("mmapsize");
+ location_id = g_quark_from_static_string ("location");
+ offset_id = g_quark_from_static_string ("offset");
+ silent_id = g_quark_from_static_string ("silent");
+ touch_id = g_quark_from_static_string ("touch");
+ }
+
+ if (prop_id == fd_id) {
+ pspec = g_param_spec_int ("fd", "File-descriptor",
+ "File-descriptor for the file being read", 0, G_MAXINT, 0, flags);
+ } else if (prop_id == blocksize_id) {
+ pspec = g_param_spec_ulong ("blocksize", "Block Size",
+ "Block size to read per buffer", 0, G_MAXULONG, 4096, flags);
+
+ } else if (prop_id == bytesperread_id) {
+ pspec = g_param_spec_int ("bytesperread", "Bytes per read",
+ "Number of bytes to read per buffer", G_MININT, G_MAXINT, 0, flags);
+
+ } else if (prop_id == dump_id) {
+ pspec = g_param_spec_boolean ("dump", "Dump",
+ "Dump bytes to stdout", FALSE, flags);
+
+ } else if (prop_id == filesize_id) {
+ pspec = g_param_spec_int64 ("filesize", "File Size",
+ "Size of the file being read", 0, G_MAXINT64, 0, flags);
+
+ } else if (prop_id == mmapsize_id) {
+ pspec = g_param_spec_ulong ("mmapsize", "mmap() Block Size",
+ "Size in bytes of mmap()d regions", 0, G_MAXULONG, 4 * 1048576, flags);
+
+ } else if (prop_id == location_id) {
+ pspec = g_param_spec_string ("location", "File Location",
+ "Location of the file to read", NULL, flags);
+
+ } else if (prop_id == offset_id) {
+ pspec = g_param_spec_int64 ("offset", "File Offset",
+ "Byte offset of current read pointer", 0, G_MAXINT64, 0, flags);
+
+ } else if (prop_id == silent_id) {
+ pspec = g_param_spec_boolean ("silent", "Silent", "Don't produce events",
+ FALSE, flags);
+
+ } else if (prop_id == touch_id) {
+ pspec = g_param_spec_boolean ("touch", "Touch read data",
+ "Touch data to force disk read before " "push ()", TRUE, flags);
+ } else {
+ g_warning ("Unknown - 'standard' property '%s' id %d from klass %s",
+ prop_name, arg_id, g_type_name (G_OBJECT_CLASS_TYPE (klass)));
+ pspec = NULL;
+ }
+
+ if (pspec) {
+ g_object_class_install_property (klass, arg_id, pspec);
+ }
+}
+
+/**
+ * gst_element_class_install_std_props:
+ * @klass: the #GstElementClass to add the properties to.
+ * @first_name: the name of the first property.
+ * in a NULL terminated
+ * @...: the id and flags of the first property, followed by
+ * further 'name', 'id', 'flags' triplets and terminated by NULL.
+ *
+ * Adds a list of standardized properties with types to the @klass.
+ * the id is for the property switch in your get_prop method, and
+ * the flags determine readability / writeability.
+ **/
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_class_install_std_props (GstElementClass * klass,
+ const gchar * first_name, ...)
+{
+ const char *name;
+
+ va_list args;
+
+ g_return_if_fail (GST_IS_ELEMENT_CLASS (klass));
+
+ va_start (args, first_name);
+
+ name = first_name;
+
+ while (name) {
+ int arg_id = va_arg (args, int);
+ int flags = va_arg (args, int);
+
+ gst_element_populate_std_props ((GObjectClass *) klass, name, arg_id,
+ flags);
+
+ name = va_arg (args, char *);
+ }
+
+ va_end (args);
+}
+
+
+/**
+ * gst_buffer_merge:
+ * @buf1: the first source #GstBuffer to merge.
+ * @buf2: the second source #GstBuffer to merge.
+ *
+ * Create a new buffer that is the concatenation of the two source
+ * buffers. The original source buffers will not be modified or
+ * unref'd. Make sure you unref the source buffers if they are not used
+ * anymore afterwards.
+ *
+ * If the buffers point to contiguous areas of memory, the buffer
+ * is created without copying the data.
+ *
+ * Returns: the new #GstBuffer which is the concatenation of the source buffers.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstBuffer *
+gst_buffer_merge (GstBuffer * buf1, GstBuffer * buf2)
+{
+ GstBuffer *result;
+
+ /* we're just a specific case of the more general gst_buffer_span() */
+ result = gst_buffer_span (buf1, 0, buf2, buf1->size + buf2->size);
+
+ return result;
+}
+
+/**
+ * gst_buffer_join:
+ * @buf1: the first source #GstBuffer.
+ * @buf2: the second source #GstBuffer.
+ *
+ * Create a new buffer that is the concatenation of the two source
+ * buffers, and unrefs the original source buffers.
+ *
+ * If the buffers point to contiguous areas of memory, the buffer
+ * is created without copying the data.
+ *
+ * Returns: the new #GstBuffer which is the concatenation of the source buffers.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstBuffer *
+gst_buffer_join (GstBuffer * buf1, GstBuffer * buf2)
+{
+ GstBuffer *result;
+
+ result = gst_buffer_span (buf1, 0, buf2, buf1->size + buf2->size);
+ gst_buffer_unref (buf1);
+ gst_buffer_unref (buf2);
+
+ return result;
+}
+
+
+/**
+ * gst_buffer_stamp:
+ * @dest: buffer to stamp
+ * @src: buffer to stamp from
+ *
+ * Copies additional information (the timestamp, duration, and offset start
+ * and end) from one buffer to the other.
+ *
+ * This function does not copy any buffer flags or caps and is equivalent to
+ * gst_buffer_copy_metadata(@dest, @src, GST_BUFFER_COPY_TIMESTAMPS).
+ *
+ * Deprecated: use gst_buffer_copy_metadata() instead, it provides more
+ * control.
+ */
+#ifndef GST_REMOVE_DEPRECATED
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+void
+gst_buffer_stamp (GstBuffer * dest, const GstBuffer * src)
+{
+ gst_buffer_copy_metadata (dest, src, GST_BUFFER_COPY_TIMESTAMPS);
+}
+#endif /* GST_REMOVE_DEPRECATED */
+
+static gboolean
+intersect_caps_func (GstPad * pad, GValue * ret, GstPad * orig)
+{
+ if (pad != orig) {
+ GstCaps *peercaps, *existing;
+
+ existing = g_value_get_pointer (ret);
+ peercaps = gst_pad_peer_get_caps (pad);
+ if (peercaps == NULL)
+ peercaps = gst_caps_new_any ();
+ g_value_set_pointer (ret, gst_caps_intersect (existing, peercaps));
+ gst_caps_unref (existing);
+ gst_caps_unref (peercaps);
+ }
+ gst_object_unref (pad);
+ return TRUE;
+}
+
+/**
+ * gst_pad_proxy_getcaps:
+ * @pad: a #GstPad to proxy.
+ *
+ * Calls gst_pad_get_allowed_caps() for every other pad belonging to the
+ * same element as @pad, and returns the intersection of the results.
+ *
+ * This function is useful as a default getcaps function for an element
+ * that can handle any stream format, but requires all its pads to have
+ * the same caps. Two such elements are tee and aggregator.
+ *
+ * Returns: the intersection of the other pads' allowed caps.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstCaps *
+gst_pad_proxy_getcaps (GstPad * pad)
+{
+ GstElement *element;
+ GstCaps *caps, *intersected;
+ GstIterator *iter;
+ GstIteratorResult res;
+ GValue ret = { 0, };
+
+ g_return_val_if_fail (GST_IS_PAD (pad), NULL);
+
+ GST_DEBUG ("proxying getcaps for %s:%s", GST_DEBUG_PAD_NAME (pad));
+
+ element = gst_pad_get_parent_element (pad);
+ if (element == NULL)
+ return NULL;
+
+ /* value to hold the return, by default it holds ANY, the ref is taken by
+ * the GValue. */
+ g_value_init (&ret, G_TYPE_POINTER);
+ g_value_set_pointer (&ret, gst_caps_new_any ());
+
+ iter = gst_element_iterate_pads (element);
+ while (1) {
+ res =
+ gst_iterator_fold (iter, (GstIteratorFoldFunction) intersect_caps_func,
+ &ret, pad);
+ switch (res) {
+ case GST_ITERATOR_RESYNC:
+ /* unref any value stored */
+ if ((caps = g_value_get_pointer (&ret)))
+ gst_caps_unref (caps);
+ /* need to reset the result again to ANY */
+ g_value_set_pointer (&ret, gst_caps_new_any ());
+ gst_iterator_resync (iter);
+ break;
+ case GST_ITERATOR_DONE:
+ /* all pads iterated, return collected value */
+ goto done;
+ default:
+ /* iterator returned _ERROR or premature end with _OK,
+ * mark an error and exit */
+ if ((caps = g_value_get_pointer (&ret)))
+ gst_caps_unref (caps);
+ g_value_set_pointer (&ret, NULL);
+ goto error;
+ }
+ }
+done:
+ gst_iterator_free (iter);
+
+ gst_object_unref (element);
+
+ caps = g_value_get_pointer (&ret);
+ g_value_unset (&ret);
+
+ intersected = gst_caps_intersect (caps, gst_pad_get_pad_template_caps (pad));
+ gst_caps_unref (caps);
+
+ return intersected;
+
+ /* ERRORS */
+error:
+ {
+ g_warning ("Pad list returned error on element %s",
+ GST_ELEMENT_NAME (element));
+ gst_iterator_free (iter);
+ gst_object_unref (element);
+ return NULL;
+ }
+}
+
+typedef struct
+{
+ GstPad *orig;
+ GstCaps *caps;
+} LinkData;
+
+static gboolean
+link_fold_func (GstPad * pad, GValue * ret, LinkData * data)
+{
+ gboolean success = TRUE;
+
+ if (pad != data->orig) {
+ success = gst_pad_set_caps (pad, data->caps);
+ g_value_set_boolean (ret, success);
+ }
+ gst_object_unref (pad);
+
+ return success;
+}
+
+/**
+ * gst_pad_proxy_setcaps
+ * @pad: a #GstPad to proxy from
+ * @caps: the #GstCaps to link with
+ *
+ * Calls gst_pad_set_caps() for every other pad belonging to the
+ * same element as @pad. If gst_pad_set_caps() fails on any pad,
+ * the proxy setcaps fails. May be used only during negotiation.
+ *
+ * Returns: TRUE if sucessful
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_pad_proxy_setcaps (GstPad * pad, GstCaps * caps)
+{
+ GstElement *element;
+ GstIterator *iter;
+ GstIteratorResult res;
+ GValue ret = { 0, };
+ LinkData data;
+
+ g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
+ g_return_val_if_fail (caps != NULL, FALSE);
+
+ GST_DEBUG ("proxying pad link for %s:%s", GST_DEBUG_PAD_NAME (pad));
+
+ element = gst_pad_get_parent_element (pad);
+ if (element == NULL)
+ return FALSE;
+
+ iter = gst_element_iterate_pads (element);
+
+ g_value_init (&ret, G_TYPE_BOOLEAN);
+ g_value_set_boolean (&ret, TRUE);
+ data.orig = pad;
+ data.caps = caps;
+
+ res = gst_iterator_fold (iter, (GstIteratorFoldFunction) link_fold_func,
+ &ret, &data);
+ gst_iterator_free (iter);
+
+ if (res != GST_ITERATOR_DONE)
+ goto pads_changed;
+
+ gst_object_unref (element);
+
+ /* ok not to unset the gvalue */
+ return g_value_get_boolean (&ret);
+
+ /* ERRORS */
+pads_changed:
+ {
+ g_warning ("Pad list changed during proxy_pad_link for element %s",
+ GST_ELEMENT_NAME (element));
+ gst_object_unref (element);
+ return FALSE;
+ }
+}
+
+/**
+ * gst_pad_query_position:
+ * @pad: a #GstPad to invoke the position query on.
+ * @format: a pointer to the #GstFormat asked for.
+ * On return contains the #GstFormat used.
+ * @cur: A location in which to store the current position, or NULL.
+ *
+ * Queries a pad for the stream position.
+ *
+ * Returns: TRUE if the query could be performed.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_pad_query_position (GstPad * pad, GstFormat * format, gint64 * cur)
+{
+ GstQuery *query;
+ gboolean ret;
+
+ g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
+ g_return_val_if_fail (format != NULL, FALSE);
+
+ query = gst_query_new_position (*format);
+ ret = gst_pad_query (pad, query);
+
+ if (ret)
+ gst_query_parse_position (query, format, cur);
+
+ gst_query_unref (query);
+
+ return ret;
+}
+
+/**
+ * gst_pad_query_peer_position:
+ * @pad: a #GstPad on whose peer to invoke the position query on.
+ * Must be a sink pad.
+ * @format: a pointer to the #GstFormat asked for.
+ * On return contains the #GstFormat used.
+ * @cur: A location in which to store the current position, or NULL.
+ *
+ * Queries the peer of a given sink pad for the stream position.
+ *
+ * Returns: TRUE if the query could be performed.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_pad_query_peer_position (GstPad * pad, GstFormat * format, gint64 * cur)
+{
+ gboolean ret = FALSE;
+ GstPad *peer;
+
+ g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
+ g_return_val_if_fail (GST_PAD_IS_SINK (pad), FALSE);
+ g_return_val_if_fail (format != NULL, FALSE);
+
+ peer = gst_pad_get_peer (pad);
+ if (peer) {
+ ret = gst_pad_query_position (peer, format, cur);
+ gst_object_unref (peer);
+ }
+
+ return ret;
+}
+
+/**
+ * gst_pad_query_duration:
+ * @pad: a #GstPad to invoke the duration query on.
+ * @format: a pointer to the #GstFormat asked for.
+ * On return contains the #GstFormat used.
+ * @duration: A location in which to store the total duration, or NULL.
+ *
+ * Queries a pad for the total stream duration.
+ *
+ * Returns: TRUE if the query could be performed.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_pad_query_duration (GstPad * pad, GstFormat * format, gint64 * duration)
+{
+ GstQuery *query;
+ gboolean ret;
+
+ g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
+ g_return_val_if_fail (format != NULL, FALSE);
+
+ query = gst_query_new_duration (*format);
+ ret = gst_pad_query (pad, query);
+
+ if (ret)
+ gst_query_parse_duration (query, format, duration);
+
+ gst_query_unref (query);
+
+ return ret;
+}
+
+/**
+ * gst_pad_query_peer_duration:
+ * @pad: a #GstPad on whose peer pad to invoke the duration query on.
+ * Must be a sink pad.
+ * @format: a pointer to the #GstFormat asked for.
+ * On return contains the #GstFormat used.
+ * @duration: A location in which to store the total duration, or NULL.
+ *
+ * Queries the peer pad of a given sink pad for the total stream duration.
+ *
+ * Returns: TRUE if the query could be performed.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_pad_query_peer_duration (GstPad * pad, GstFormat * format,
+ gint64 * duration)
+{
+ gboolean ret = FALSE;
+ GstPad *peer;
+
+ g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
+ g_return_val_if_fail (GST_PAD_IS_SINK (pad), FALSE);
+ g_return_val_if_fail (format != NULL, FALSE);
+
+ peer = gst_pad_get_peer (pad);
+ if (peer) {
+ ret = gst_pad_query_duration (peer, format, duration);
+ gst_object_unref (peer);
+ }
+
+ return ret;
+}
+
+/**
+ * gst_pad_query_convert:
+ * @pad: a #GstPad to invoke the convert query on.
+ * @src_format: a #GstFormat to convert from.
+ * @src_val: a value to convert.
+ * @dest_format: a pointer to the #GstFormat to convert to.
+ * @dest_val: a pointer to the result.
+ *
+ * Queries a pad to convert @src_val in @src_format to @dest_format.
+ *
+ * Returns: TRUE if the query could be performed.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_pad_query_convert (GstPad * pad, GstFormat src_format, gint64 src_val,
+ GstFormat * dest_format, gint64 * dest_val)
+{
+ GstQuery *query;
+ gboolean ret;
+
+ g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
+ g_return_val_if_fail (src_val >= 0, FALSE);
+ g_return_val_if_fail (dest_format != NULL, FALSE);
+ g_return_val_if_fail (dest_val != NULL, FALSE);
+
+ if (*dest_format == src_format) {
+ *dest_val = src_val;
+ return TRUE;
+ }
+
+ query = gst_query_new_convert (src_format, src_val, *dest_format);
+ ret = gst_pad_query (pad, query);
+
+ if (ret)
+ gst_query_parse_convert (query, NULL, NULL, dest_format, dest_val);
+
+ gst_query_unref (query);
+
+ return ret;
+}
+
+/**
+ * gst_pad_query_peer_convert:
+ * @pad: a #GstPad, on whose peer pad to invoke the convert query on.
+ * Must be a sink pad.
+ * @src_format: a #GstFormat to convert from.
+ * @src_val: a value to convert.
+ * @dest_format: a pointer to the #GstFormat to convert to.
+ * @dest_val: a pointer to the result.
+ *
+ * Queries the peer pad of a given sink pad to convert @src_val in @src_format
+ * to @dest_format.
+ *
+ * Returns: TRUE if the query could be performed.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_pad_query_peer_convert (GstPad * pad, GstFormat src_format, gint64 src_val,
+ GstFormat * dest_format, gint64 * dest_val)
+{
+ gboolean ret = FALSE;
+ GstPad *peer;
+
+ g_return_val_if_fail (GST_IS_PAD (pad), FALSE);
+ g_return_val_if_fail (GST_PAD_IS_SINK (pad), FALSE);
+ g_return_val_if_fail (src_val >= 0, FALSE);
+ g_return_val_if_fail (dest_format != NULL, FALSE);
+ g_return_val_if_fail (dest_val != NULL, FALSE);
+
+ peer = gst_pad_get_peer (pad);
+ if (peer) {
+ ret = gst_pad_query_convert (peer, src_format, src_val, dest_format,
+ dest_val);
+ gst_object_unref (peer);
+ }
+
+ return ret;
+}
+
+/**
+ * gst_atomic_int_set:
+ * @atomic_int: pointer to an atomic integer
+ * @value: value to set
+ *
+ * Unconditionally sets the atomic integer to @value.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_atomic_int_set (gint * atomic_int, gint value)
+{
+ int ignore;
+
+ *atomic_int = value;
+ /* read acts as a memory barrier */
+ ignore = g_atomic_int_get (atomic_int);
+}
+
+/**
+ * gst_pad_add_data_probe:
+ * @pad: pad to add the data probe handler to
+ * @handler: function to call when data is passed over pad
+ * @data: data to pass along with the handler
+ *
+ * Adds a "data probe" to a pad. This function will be called whenever data
+ * passes through a pad. In this case data means both events and buffers. The
+ * probe will be called with the data as an argument, meaning @handler should
+ * have the same callback signature as the #GstPad::have-data signal.
+ * Note that the data will have a reference count greater than 1, so it will
+ * be immutable -- you must not change it.
+ *
+ * For source pads, the probe will be called after the blocking function, if any
+ * (see gst_pad_set_blocked_async()), but before looking up the peer to chain
+ * to. For sink pads, the probe function will be called before configuring the
+ * sink with new caps, if any, and before calling the pad's chain function.
+ *
+ * Your data probe should return TRUE to let the data continue to flow, or FALSE
+ * to drop it. Dropping data is rarely useful, but occasionally comes in handy
+ * with events.
+ *
+ * Although probes are implemented internally by connecting @handler to the
+ * have-data signal on the pad, if you want to remove a probe it is insufficient
+ * to only call g_signal_handler_disconnect on the returned handler id. To
+ * remove a probe, use the appropriate function, such as
+ * gst_pad_remove_data_probe().
+ *
+ * Returns: The handler id.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gulong
+gst_pad_add_data_probe (GstPad * pad, GCallback handler, gpointer data)
+{
+ gulong sigid;
+
+ g_return_val_if_fail (GST_IS_PAD (pad), 0);
+ g_return_val_if_fail (handler != NULL, 0);
+
+ GST_OBJECT_LOCK (pad);
+ sigid = g_signal_connect (pad, "have-data", handler, data);
+ GST_PAD_DO_EVENT_SIGNALS (pad)++;
+ GST_PAD_DO_BUFFER_SIGNALS (pad)++;
+ GST_DEBUG ("adding data probe to pad %s:%s, now %d data, %d event probes",
+ GST_DEBUG_PAD_NAME (pad),
+ GST_PAD_DO_BUFFER_SIGNALS (pad), GST_PAD_DO_EVENT_SIGNALS (pad));
+ GST_OBJECT_UNLOCK (pad);
+
+ return sigid;
+}
+
+/**
+ * gst_pad_add_event_probe:
+ * @pad: pad to add the event probe handler to
+ * @handler: function to call when events are passed over pad
+ * @data: data to pass along with the handler
+ *
+ * Adds a probe that will be called for all events passing through a pad. See
+ * gst_pad_add_data_probe() for more information.
+ *
+ * Returns: The handler id
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gulong
+gst_pad_add_event_probe (GstPad * pad, GCallback handler, gpointer data)
+{
+ gulong sigid;
+
+ g_return_val_if_fail (GST_IS_PAD (pad), 0);
+ g_return_val_if_fail (handler != NULL, 0);
+
+ GST_OBJECT_LOCK (pad);
+ sigid = g_signal_connect (pad, "have-data::event", handler, data);
+ GST_PAD_DO_EVENT_SIGNALS (pad)++;
+ GST_DEBUG ("adding event probe to pad %s:%s, now %d probes",
+ GST_DEBUG_PAD_NAME (pad), GST_PAD_DO_EVENT_SIGNALS (pad));
+ GST_OBJECT_UNLOCK (pad);
+
+ return sigid;
+}
+
+/**
+ * gst_pad_add_buffer_probe:
+ * @pad: pad to add the buffer probe handler to
+ * @handler: function to call when buffers are passed over pad
+ * @data: data to pass along with the handler
+ *
+ * Adds a probe that will be called for all buffers passing through a pad. See
+ * gst_pad_add_data_probe() for more information.
+ *
+ * Returns: The handler id
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gulong
+gst_pad_add_buffer_probe (GstPad * pad, GCallback handler, gpointer data)
+{
+ gulong sigid;
+
+ g_return_val_if_fail (GST_IS_PAD (pad), 0);
+ g_return_val_if_fail (handler != NULL, 0);
+
+ GST_OBJECT_LOCK (pad);
+ sigid = g_signal_connect (pad, "have-data::buffer", handler, data);
+ GST_PAD_DO_BUFFER_SIGNALS (pad)++;
+ GST_DEBUG ("adding buffer probe to pad %s:%s, now %d probes",
+ GST_DEBUG_PAD_NAME (pad), GST_PAD_DO_BUFFER_SIGNALS (pad));
+ GST_OBJECT_UNLOCK (pad);
+
+ return sigid;
+}
+
+/**
+ * gst_pad_remove_data_probe:
+ * @pad: pad to remove the data probe handler from
+ * @handler_id: handler id returned from gst_pad_add_data_probe
+ *
+ * Removes a data probe from @pad.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_pad_remove_data_probe (GstPad * pad, guint handler_id)
+{
+ g_return_if_fail (GST_IS_PAD (pad));
+ g_return_if_fail (handler_id > 0);
+
+ GST_OBJECT_LOCK (pad);
+ g_signal_handler_disconnect (pad, handler_id);
+ GST_PAD_DO_BUFFER_SIGNALS (pad)--;
+ GST_PAD_DO_EVENT_SIGNALS (pad)--;
+ GST_DEBUG
+ ("removed data probe from pad %s:%s, now %d event, %d buffer probes",
+ GST_DEBUG_PAD_NAME (pad), GST_PAD_DO_EVENT_SIGNALS (pad),
+ GST_PAD_DO_BUFFER_SIGNALS (pad));
+ GST_OBJECT_UNLOCK (pad);
+
+}
+
+/**
+ * gst_pad_remove_event_probe:
+ * @pad: pad to remove the event probe handler from
+ * @handler_id: handler id returned from gst_pad_add_event_probe
+ *
+ * Removes an event probe from @pad.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_pad_remove_event_probe (GstPad * pad, guint handler_id)
+{
+ g_return_if_fail (GST_IS_PAD (pad));
+ g_return_if_fail (handler_id > 0);
+
+ GST_OBJECT_LOCK (pad);
+ g_signal_handler_disconnect (pad, handler_id);
+ GST_PAD_DO_EVENT_SIGNALS (pad)--;
+ GST_DEBUG ("removed event probe from pad %s:%s, now %d event probes",
+ GST_DEBUG_PAD_NAME (pad), GST_PAD_DO_EVENT_SIGNALS (pad));
+ GST_OBJECT_UNLOCK (pad);
+}
+
+/**
+ * gst_pad_remove_buffer_probe:
+ * @pad: pad to remove the buffer probe handler from
+ * @handler_id: handler id returned from gst_pad_add_buffer_probe
+ *
+ * Removes a buffer probe from @pad.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_pad_remove_buffer_probe (GstPad * pad, guint handler_id)
+{
+ g_return_if_fail (GST_IS_PAD (pad));
+ g_return_if_fail (handler_id > 0);
+
+ GST_OBJECT_LOCK (pad);
+ g_signal_handler_disconnect (pad, handler_id);
+ GST_PAD_DO_BUFFER_SIGNALS (pad)--;
+ GST_DEBUG ("removed buffer probe from pad %s:%s, now %d buffer probes",
+ GST_DEBUG_PAD_NAME (pad), GST_PAD_DO_BUFFER_SIGNALS (pad));
+ GST_OBJECT_UNLOCK (pad);
+
+}
+
+/**
+ * gst_element_found_tags_for_pad:
+ * @element: element for which to post taglist to bus.
+ * @pad: pad on which to push tag-event.
+ * @list: the taglist to post on the bus and create event from.
+ *
+ * Posts a message to the bus that new tags were found and pushes the
+ * tags as event. Takes ownership of the @list.
+ *
+ * This is a utility method for elements. Applications should use the
+ * #GstTagSetter interface.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_found_tags_for_pad (GstElement * element,
+ GstPad * pad, GstTagList * list)
+{
+ g_return_if_fail (element != NULL);
+ g_return_if_fail (pad != NULL);
+ g_return_if_fail (list != NULL);
+
+ gst_pad_push_event (pad, gst_event_new_tag (gst_tag_list_copy (list)));
+ gst_element_post_message (element,
+ gst_message_new_tag (GST_OBJECT (element), list));
+}
+
+static void
+push_and_ref (GstPad * pad, GstEvent * event)
+{
+ gst_pad_push_event (pad, gst_event_ref (event));
+ /* iterator refs pad, we unref when we are done with it */
+ gst_object_unref (pad);
+}
+
+/**
+ * gst_element_found_tags:
+ * @element: element for which we found the tags.
+ * @list: list of tags.
+ *
+ * Posts a message to the bus that new tags were found, and pushes an event
+ * to all sourcepads. Takes ownership of the @list.
+ *
+ * This is a utility method for elements. Applications should use the
+ * #GstTagSetter interface.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_element_found_tags (GstElement * element, GstTagList * list)
+{
+ GstIterator *iter;
+ GstEvent *event;
+
+ g_return_if_fail (element != NULL);
+ g_return_if_fail (list != NULL);
+
+ iter = gst_element_iterate_src_pads (element);
+ event = gst_event_new_tag (gst_tag_list_copy (list));
+ gst_iterator_foreach (iter, (GFunc) push_and_ref, event);
+ gst_iterator_free (iter);
+ gst_event_unref (event);
+
+ gst_element_post_message (element,
+ gst_message_new_tag (GST_OBJECT (element), list));
+}
+
+static GstPad *
+element_find_unconnected_pad (GstElement * element, GstPadDirection direction)
+{
+ GstIterator *iter;
+ GstPad *unconnected_pad = NULL;
+ gboolean done;
+
+ switch (direction) {
+ case GST_PAD_SRC:
+ iter = gst_element_iterate_src_pads (element);
+ break;
+ case GST_PAD_SINK:
+ iter = gst_element_iterate_sink_pads (element);
+ break;
+ default:
+ g_return_val_if_reached (NULL);
+ }
+
+ done = FALSE;
+ while (!done) {
+ gpointer pad;
+
+ switch (gst_iterator_next (iter, &pad)) {
+ case GST_ITERATOR_OK:{
+ GstPad *peer;
+
+ GST_CAT_LOG (GST_CAT_ELEMENT_PADS, "examining pad %s:%s",
+ GST_DEBUG_PAD_NAME (pad));
+
+ peer = gst_pad_get_peer (GST_PAD (pad));
+ if (peer == NULL) {
+ unconnected_pad = pad;
+ done = TRUE;
+ GST_CAT_DEBUG (GST_CAT_ELEMENT_PADS,
+ "found existing unlinked pad %s:%s",
+ GST_DEBUG_PAD_NAME (unconnected_pad));
+ } else {
+ gst_object_unref (pad);
+ gst_object_unref (peer);
+ }
+ break;
+ }
+ case GST_ITERATOR_DONE:
+ done = TRUE;
+ break;
+ case GST_ITERATOR_RESYNC:
+ gst_iterator_resync (iter);
+ break;
+ case GST_ITERATOR_ERROR:
+ g_return_val_if_reached (NULL);
+ break;
+ }
+ }
+
+ gst_iterator_free (iter);
+
+ return unconnected_pad;
+}
+
+/**
+ * gst_bin_find_unconnected_pad:
+ * @bin: bin in which to look for elements with unconnected pads
+ * @direction: whether to look for an unconnected source or sink pad
+ *
+ * Recursively looks for elements with an unconnected pad of the given
+ * direction within the specified bin and returns an unconnected pad
+ * if one is found, or NULL otherwise. If a pad is found, the caller
+ * owns a reference to it and should use gst_object_unref() on the
+ * pad when it is not needed any longer.
+ *
+ * Returns: unconnected pad of the given direction, or NULL.
+ *
+ * Since: 0.10.3
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstPad *
+gst_bin_find_unconnected_pad (GstBin * bin, GstPadDirection direction)
+{
+ GstIterator *iter;
+ gboolean done;
+ GstPad *pad = NULL;
+
+ g_return_val_if_fail (GST_IS_BIN (bin), NULL);
+ g_return_val_if_fail (direction != GST_PAD_UNKNOWN, NULL);
+
+ done = FALSE;
+ iter = gst_bin_iterate_recurse (bin);
+ while (!done) {
+ gpointer element;
+
+ switch (gst_iterator_next (iter, &element)) {
+ case GST_ITERATOR_OK:
+ pad = element_find_unconnected_pad (GST_ELEMENT (element), direction);
+ gst_object_unref (element);
+ if (pad != NULL)
+ done = TRUE;
+ break;
+ case GST_ITERATOR_DONE:
+ done = TRUE;
+ break;
+ case GST_ITERATOR_RESYNC:
+ gst_iterator_resync (iter);
+ break;
+ case GST_ITERATOR_ERROR:
+ g_return_val_if_reached (NULL);
+ break;
+ }
+ }
+
+ gst_iterator_free (iter);
+
+ return pad;
+}
+
+/**
+ * gst_parse_bin_from_description:
+ * @bin_description: command line describing the bin
+ * @ghost_unconnected_pads: whether to automatically create ghost pads
+ * for unconnected source or sink pads within
+ * the bin
+ * @err: where to store the error message in case of an error, or NULL
+ *
+ * This is a convenience wrapper around gst_parse_launch() to create a
+ * #GstBin from a gst-launch-style pipeline description. See
+ * gst_parse_launch() and the gst-launch man page for details about the
+ * syntax. Ghost pads on the bin for unconnected source or sink pads
+ * within the bin can automatically be created (but only a maximum of
+ * one ghost pad for each direction will be created; if you expect
+ * multiple unconnected source pads or multiple unconnected sink pads
+ * and want them all ghosted, you will have to create the ghost pads
+ * yourself).
+ *
+ * Returns: a newly-created bin, or NULL if an error occurred.
+ *
+ * Since: 0.10.3
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstElement *
+gst_parse_bin_from_description (const gchar * bin_description,
+ gboolean ghost_unconnected_pads, GError ** err)
+{
+#ifndef GST_DISABLE_PARSE
+ GstPad *pad = NULL;
+ GstBin *bin;
+ gchar *desc;
+
+ g_return_val_if_fail (bin_description != NULL, NULL);
+ g_return_val_if_fail (err == NULL || *err == NULL, NULL);
+
+ GST_DEBUG ("Making bin from description '%s'", bin_description);
+
+ /* parse the pipeline to a bin */
+ desc = g_strdup_printf ("bin.( %s )", bin_description);
+ bin = (GstBin *) gst_parse_launch (desc, err);
+ g_free (desc);
+
+ if (bin == NULL || (err && *err != NULL)) {
+ if (bin)
+ gst_object_unref (bin);
+ return NULL;
+ }
+
+ /* find pads and ghost them if necessary */
+ if (ghost_unconnected_pads) {
+ if ((pad = gst_bin_find_unconnected_pad (bin, GST_PAD_SRC))) {
+ gst_element_add_pad (GST_ELEMENT (bin), gst_ghost_pad_new ("src", pad));
+ gst_object_unref (pad);
+ }
+ if ((pad = gst_bin_find_unconnected_pad (bin, GST_PAD_SINK))) {
+ gst_element_add_pad (GST_ELEMENT (bin), gst_ghost_pad_new ("sink", pad));
+ gst_object_unref (pad);
+ }
+ }
+
+ return GST_ELEMENT (bin);
+#else
+ gchar *msg;
+
+ GST_WARNING ("Disabled API called: gst_parse_bin_from_description()");
+
+ msg = gst_error_get_message (GST_CORE_ERROR, GST_CORE_ERROR_DISABLED);
+ g_set_error (err, GST_CORE_ERROR, GST_CORE_ERROR_DISABLED, "%s", msg);
+ g_free (msg);
+
+ return NULL;
+#endif
+}
+
+/**
+ * gst_type_register_static_full:
+ * @parent_type: The GType of the parent type the newly registered type will
+ * derive from
+ * @type_name: NULL-terminated string used as the name of the new type
+ * @class_size: Size of the class structure.
+ * @base_init: Location of the base initialization function (optional).
+ * @base_finalize: Location of the base finalization function (optional).
+ * @class_init: Location of the class initialization function for class types
+ * Location of the default vtable inititalization function for interface
+ * types. (optional)
+ * @class_finalize: Location of the class finalization function for class types.
+ * Location of the default vtable finalization function for interface types.
+ * (optional)
+ * @class_data: User-supplied data passed to the class init/finalize functions.
+ * @instance_size: Size of the instance (object) structure (required for
+ * instantiatable types only).
+ * @n_preallocs: The number of pre-allocated (cached) instances to reserve
+ * memory for (0 indicates no caching). Ignored on recent GLib's.
+ * @instance_init: Location of the instance initialization function (optional,
+ * for instantiatable types only).
+ * @value_table: A GTypeValueTable function table for generic handling of
+ * GValues of this type (usually only useful for fundamental types).
+ * @flags: #GTypeFlags for this GType. E.g: G_TYPE_FLAG_ABSTRACT
+ *
+ * Helper function which constructs a #GTypeInfo structure and registers a
+ * GType, but which generates less linker overhead than a static const
+ * #GTypeInfo structure. For further details of the parameters, please see
+ * #GTypeInfo in the GLib documentation.
+ *
+ * Registers type_name as the name of a new static type derived from
+ * parent_type. The value of flags determines the nature (e.g. abstract or
+ * not) of the type. It works by filling a GTypeInfo struct and calling
+ * g_type_info_register_static().
+ *
+ * Returns: A #GType for the newly-registered type.
+ *
+ * Since: 0.10.14
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GType
+gst_type_register_static_full (GType parent_type,
+ const gchar * type_name,
+ guint class_size,
+ GBaseInitFunc base_init,
+ GBaseFinalizeFunc base_finalize,
+ GClassInitFunc class_init,
+ GClassFinalizeFunc class_finalize,
+ gconstpointer class_data,
+ guint instance_size,
+ guint16 n_preallocs,
+ GInstanceInitFunc instance_init,
+ const GTypeValueTable * value_table, GTypeFlags flags)
+{
+ GTypeInfo info;
+
+ info.class_size = class_size;
+ info.base_init = base_init;
+ info.base_finalize = base_finalize;
+ info.class_init = class_init;
+ info.class_finalize = class_finalize;
+ info.class_data = class_data;
+ info.instance_size = instance_size;
+ info.n_preallocs = n_preallocs;
+ info.instance_init = instance_init;
+ info.value_table = value_table;
+
+ return g_type_register_static (parent_type, type_name, &info, flags);
+}
+
+
+/**
+ * gst_util_get_timestamp:
+ *
+ * Get a timestamp as GstClockTime to be used for interval meassurements.
+ * The timestamp should not be interpreted in any other way.
+ *
+ * Returns: the timestamp
+ *
+ * Since: 0.10.16
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstClockTime
+gst_util_get_timestamp (void)
+{
+#if defined (HAVE_POSIX_TIMERS) && defined(HAVE_MONOTONIC_CLOCK)
+ struct timespec now;
+
+ clock_gettime (CLOCK_MONOTONIC, &now);
+ return GST_TIMESPEC_TO_TIME (now);
+#else
+ GTimeVal now;
+
+ g_get_current_time (&now);
+ return GST_TIMEVAL_TO_TIME (now);
+#endif
+}