diff -r 000000000000 -r 0e761a78d257 gstreamer_core/gst/gstutils.c --- /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 + * 2000 Wim Taymans + * 2002 Thomas Vander Stichele + * + * 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 +#include + +#include "gstghostpad.h" +#include "gstutils.h" +#include "gsterror.h" +#include "gstinfo.h" +#include "gstparse.h" +#include "gst-i18n-lib.h" + +#ifdef __SYMBIAN32__ +#include +#include +#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 +}