author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 08:53:32 +0200 | |
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permissions | -rw-r--r-- |
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/* GStreamer |
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> |
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* 2000 Wim Taymans <wim.taymans@chello.be> |
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* 2005 Wim Taymans <wim@fluendo.com> |
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* |
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* gstformat.c: GstFormat registration |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Library General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Library General Public License for more details. |
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* |
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* You should have received a copy of the GNU Library General Public |
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* License along with this library; if not, write to the |
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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* Boston, MA 02111-1307, USA. |
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*/ |
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|
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/** |
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* SECTION:gstformat |
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* @short_description: Dynamically register new data formats |
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* @see_also: #GstPad, #GstElement |
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* |
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* GstFormats functions are used to register a new format to the gstreamer |
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* core. Formats can be used to perform seeking or conversions/query |
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* operations. |
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*/ |
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#include "gst_private.h" |
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#include <string.h> |
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#include "gstformat.h" |
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#include "gstenumtypes.h" |
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#ifdef __SYMBIAN32__ |
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#include <glib_global.h> |
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#endif |
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static GStaticMutex mutex = G_STATIC_MUTEX_INIT; |
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static GList *_gst_formats = NULL; |
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static GHashTable *_nick_to_format = NULL; |
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static GHashTable *_format_to_nick = NULL; |
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static guint32 _n_values = 1; /* we start from 1 because 0 reserved for UNDEFINED */ |
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static GstFormatDefinition standard_definitions[] = { |
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{GST_FORMAT_DEFAULT, "default", "Default format for the media type", 0}, |
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{GST_FORMAT_BYTES, "bytes", "Bytes", 0}, |
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{GST_FORMAT_TIME, "time", "Time", 0}, |
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{GST_FORMAT_BUFFERS, "buffers", "Buffers", 0}, |
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{GST_FORMAT_PERCENT, "percent", "Percent", 0}, |
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{0, NULL, NULL, 0} |
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}; |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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void |
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_gst_format_initialize (void) |
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{ |
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GstFormatDefinition *standards = standard_definitions; |
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g_static_mutex_lock (&mutex); |
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if (_nick_to_format == NULL) { |
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_nick_to_format = g_hash_table_new (g_str_hash, g_str_equal); |
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_format_to_nick = g_hash_table_new (NULL, NULL); |
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} |
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while (standards->nick) { |
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standards->quark = g_quark_from_static_string (standards->nick); |
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g_hash_table_insert (_nick_to_format, standards->nick, standards); |
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g_hash_table_insert (_format_to_nick, GINT_TO_POINTER (standards->value), |
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standards); |
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_gst_formats = g_list_append (_gst_formats, standards); |
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standards++; |
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_n_values++; |
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} |
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/* getting the type registers the enum */ |
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g_type_class_ref (gst_format_get_type ()); |
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g_static_mutex_unlock (&mutex); |
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} |
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/** |
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* gst_format_get_name: |
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* @format: a #GstFormat |
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* |
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* Get a printable name for the given format. Do not modify or free. |
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* |
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* Returns: a reference to the static name of the format or NULL if |
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* the format is unknown. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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const gchar * |
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gst_format_get_name (GstFormat format) |
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104 |
{ |
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105 |
const GstFormatDefinition *def; |
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106 |
const gchar *result; |
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107 |
|
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if ((def = gst_format_get_details (format)) != NULL) |
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result = def->nick; |
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110 |
else |
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result = NULL; |
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112 |
|
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113 |
return result; |
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114 |
} |
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115 |
|
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116 |
/** |
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117 |
* gst_format_to_quark: |
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* @format: a #GstFormat |
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119 |
* |
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* Get the unique quark for the given format. |
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121 |
* |
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* Returns: the quark associated with the format or 0 if the format |
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* is unknown. |
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124 |
*/ |
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125 |
#ifdef __SYMBIAN32__ |
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126 |
EXPORT_C |
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#endif |
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128 |
|
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129 |
GQuark |
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130 |
gst_format_to_quark (GstFormat format) |
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131 |
{ |
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132 |
const GstFormatDefinition *def; |
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GQuark result; |
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134 |
|
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if ((def = gst_format_get_details (format)) != NULL) |
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result = def->quark; |
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137 |
else |
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138 |
result = 0; |
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139 |
|
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140 |
return result; |
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141 |
} |
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142 |
|
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143 |
/** |
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144 |
* gst_format_register: |
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145 |
* @nick: The nick of the new format |
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* @description: The description of the new format |
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147 |
* |
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148 |
* Create a new GstFormat based on the nick or return an |
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149 |
* already registered format with that nick. |
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150 |
* |
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151 |
* Returns: A new GstFormat or an already registered format |
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152 |
* with the same nick. |
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153 |
* |
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154 |
* MT safe. |
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155 |
*/ |
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156 |
#ifdef __SYMBIAN32__ |
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157 |
EXPORT_C |
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158 |
#endif |
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159 |
|
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160 |
GstFormat |
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161 |
gst_format_register (const gchar * nick, const gchar * description) |
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162 |
{ |
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163 |
GstFormatDefinition *format; |
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164 |
GstFormat query; |
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165 |
|
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166 |
g_return_val_if_fail (nick != NULL, 0); |
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167 |
g_return_val_if_fail (description != NULL, 0); |
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168 |
|
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169 |
query = gst_format_get_by_nick (nick); |
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if (query != GST_FORMAT_UNDEFINED) |
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171 |
return query; |
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172 |
|
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173 |
g_static_mutex_lock (&mutex); |
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174 |
format = g_new0 (GstFormatDefinition, 1); |
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175 |
format->value = _n_values; |
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176 |
format->nick = g_strdup (nick); |
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177 |
format->description = g_strdup (description); |
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format->quark = g_quark_from_static_string (format->nick); |
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|
179 |
|
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180 |
g_hash_table_insert (_nick_to_format, format->nick, format); |
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181 |
g_hash_table_insert (_format_to_nick, GINT_TO_POINTER (format->value), |
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182 |
format); |
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183 |
_gst_formats = g_list_append (_gst_formats, format); |
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184 |
_n_values++; |
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185 |
g_static_mutex_unlock (&mutex); |
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186 |
|
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187 |
return format->value; |
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188 |
} |
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189 |
|
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190 |
/** |
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191 |
* gst_format_get_by_nick: |
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192 |
* @nick: The nick of the format |
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193 |
* |
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194 |
* Return the format registered with the given nick. |
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195 |
* |
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196 |
* Returns: The format with @nick or GST_FORMAT_UNDEFINED |
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197 |
* if the format was not registered. |
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198 |
*/ |
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199 |
#ifdef __SYMBIAN32__ |
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200 |
EXPORT_C |
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201 |
#endif |
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202 |
|
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203 |
GstFormat |
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204 |
gst_format_get_by_nick (const gchar * nick) |
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205 |
{ |
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206 |
GstFormatDefinition *format; |
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207 |
|
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208 |
g_return_val_if_fail (nick != NULL, 0); |
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209 |
|
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210 |
g_static_mutex_lock (&mutex); |
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format = g_hash_table_lookup (_nick_to_format, nick); |
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g_static_mutex_unlock (&mutex); |
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|
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if (format != NULL) |
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return format->value; |
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else |
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return GST_FORMAT_UNDEFINED; |
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} |
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|
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/** |
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* gst_formats_contains: |
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* @formats: The format array to search |
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* @format: the format to find |
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* |
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* See if the given format is inside the format array. |
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* |
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* Returns: TRUE if the format is found inside the array |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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232 |
|
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233 |
gboolean |
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gst_formats_contains (const GstFormat * formats, GstFormat format) |
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{ |
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if (!formats) |
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return FALSE; |
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|
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while (*formats) { |
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if (*formats == format) |
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return TRUE; |
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|
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formats++; |
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} |
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return FALSE; |
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} |
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|
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|
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/** |
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* gst_format_get_details: |
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* @format: The format to get details of |
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* |
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* Get details about the given format. |
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* |
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* Returns: The #GstFormatDefinition for @format or NULL on failure. |
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* |
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* MT safe. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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|
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const GstFormatDefinition * |
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gst_format_get_details (GstFormat format) |
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{ |
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const GstFormatDefinition *result; |
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|
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g_static_mutex_lock (&mutex); |
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result = g_hash_table_lookup (_format_to_nick, GINT_TO_POINTER (format)); |
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g_static_mutex_unlock (&mutex); |
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|
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return result; |
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} |
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|
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/** |
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* gst_format_iterate_definitions: |
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* |
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* Iterate all the registered formats. The format definition is read |
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* only. |
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* |
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* Returns: A GstIterator of #GstFormatDefinition. |
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*/ |
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#ifdef __SYMBIAN32__ |
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EXPORT_C |
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#endif |
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|
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GstIterator * |
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gst_format_iterate_definitions (void) |
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{ |
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GstIterator *result; |
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|
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g_static_mutex_lock (&mutex); |
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/* FIXME: register a boxed type for GstFormatDefinition */ |
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result = gst_iterator_new_list (G_TYPE_POINTER, |
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g_static_mutex_get_mutex (&mutex), &_n_values, &_gst_formats, |
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NULL, NULL, NULL); |
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g_static_mutex_unlock (&mutex); |
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|
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return result; |
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} |