diff -r 000000000000 -r 0e761a78d257 gstreamer_core/gst/gstformat.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gstreamer_core/gst/gstformat.c Thu Dec 17 08:53:32 2009 +0200 @@ -0,0 +1,300 @@ +/* GStreamer + * Copyright (C) 1999,2000 Erik Walthinsen + * 2000 Wim Taymans + * 2005 Wim Taymans + * + * gstformat.c: GstFormat registration + * + * 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:gstformat + * @short_description: Dynamically register new data formats + * @see_also: #GstPad, #GstElement + * + * GstFormats functions are used to register a new format to the gstreamer + * core. Formats can be used to perform seeking or conversions/query + * operations. + */ + + +#include "gst_private.h" +#include +#include "gstformat.h" +#include "gstenumtypes.h" + +#ifdef __SYMBIAN32__ +#include +#endif + +static GStaticMutex mutex = G_STATIC_MUTEX_INIT; +static GList *_gst_formats = NULL; +static GHashTable *_nick_to_format = NULL; +static GHashTable *_format_to_nick = NULL; +static guint32 _n_values = 1; /* we start from 1 because 0 reserved for UNDEFINED */ + +static GstFormatDefinition standard_definitions[] = { + {GST_FORMAT_DEFAULT, "default", "Default format for the media type", 0}, + {GST_FORMAT_BYTES, "bytes", "Bytes", 0}, + {GST_FORMAT_TIME, "time", "Time", 0}, + {GST_FORMAT_BUFFERS, "buffers", "Buffers", 0}, + {GST_FORMAT_PERCENT, "percent", "Percent", 0}, + {0, NULL, NULL, 0} +}; +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + + +void +_gst_format_initialize (void) +{ + GstFormatDefinition *standards = standard_definitions; + + g_static_mutex_lock (&mutex); + if (_nick_to_format == NULL) { + _nick_to_format = g_hash_table_new (g_str_hash, g_str_equal); + _format_to_nick = g_hash_table_new (NULL, NULL); + } + + while (standards->nick) { + standards->quark = g_quark_from_static_string (standards->nick); + g_hash_table_insert (_nick_to_format, standards->nick, standards); + g_hash_table_insert (_format_to_nick, GINT_TO_POINTER (standards->value), + standards); + + _gst_formats = g_list_append (_gst_formats, standards); + standards++; + _n_values++; + } + /* getting the type registers the enum */ + g_type_class_ref (gst_format_get_type ()); + g_static_mutex_unlock (&mutex); +} + +/** + * gst_format_get_name: + * @format: a #GstFormat + * + * Get a printable name for the given format. Do not modify or free. + * + * Returns: a reference to the static name of the format or NULL if + * the format is unknown. + */ +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + +const gchar * +gst_format_get_name (GstFormat format) +{ + const GstFormatDefinition *def; + const gchar *result; + + if ((def = gst_format_get_details (format)) != NULL) + result = def->nick; + else + result = NULL; + + return result; +} + +/** + * gst_format_to_quark: + * @format: a #GstFormat + * + * Get the unique quark for the given format. + * + * Returns: the quark associated with the format or 0 if the format + * is unknown. + */ +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + +GQuark +gst_format_to_quark (GstFormat format) +{ + const GstFormatDefinition *def; + GQuark result; + + if ((def = gst_format_get_details (format)) != NULL) + result = def->quark; + else + result = 0; + + return result; +} + +/** + * gst_format_register: + * @nick: The nick of the new format + * @description: The description of the new format + * + * Create a new GstFormat based on the nick or return an + * already registered format with that nick. + * + * Returns: A new GstFormat or an already registered format + * with the same nick. + * + * MT safe. + */ +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + +GstFormat +gst_format_register (const gchar * nick, const gchar * description) +{ + GstFormatDefinition *format; + GstFormat query; + + g_return_val_if_fail (nick != NULL, 0); + g_return_val_if_fail (description != NULL, 0); + + query = gst_format_get_by_nick (nick); + if (query != GST_FORMAT_UNDEFINED) + return query; + + g_static_mutex_lock (&mutex); + format = g_new0 (GstFormatDefinition, 1); + format->value = _n_values; + format->nick = g_strdup (nick); + format->description = g_strdup (description); + format->quark = g_quark_from_static_string (format->nick); + + g_hash_table_insert (_nick_to_format, format->nick, format); + g_hash_table_insert (_format_to_nick, GINT_TO_POINTER (format->value), + format); + _gst_formats = g_list_append (_gst_formats, format); + _n_values++; + g_static_mutex_unlock (&mutex); + + return format->value; +} + +/** + * gst_format_get_by_nick: + * @nick: The nick of the format + * + * Return the format registered with the given nick. + * + * Returns: The format with @nick or GST_FORMAT_UNDEFINED + * if the format was not registered. + */ +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + +GstFormat +gst_format_get_by_nick (const gchar * nick) +{ + GstFormatDefinition *format; + + g_return_val_if_fail (nick != NULL, 0); + + g_static_mutex_lock (&mutex); + format = g_hash_table_lookup (_nick_to_format, nick); + g_static_mutex_unlock (&mutex); + + if (format != NULL) + return format->value; + else + return GST_FORMAT_UNDEFINED; +} + +/** + * gst_formats_contains: + * @formats: The format array to search + * @format: the format to find + * + * See if the given format is inside the format array. + * + * Returns: TRUE if the format is found inside the array + */ +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + +gboolean +gst_formats_contains (const GstFormat * formats, GstFormat format) +{ + if (!formats) + return FALSE; + + while (*formats) { + if (*formats == format) + return TRUE; + + formats++; + } + return FALSE; +} + + +/** + * gst_format_get_details: + * @format: The format to get details of + * + * Get details about the given format. + * + * Returns: The #GstFormatDefinition for @format or NULL on failure. + * + * MT safe. + */ +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + +const GstFormatDefinition * +gst_format_get_details (GstFormat format) +{ + const GstFormatDefinition *result; + + g_static_mutex_lock (&mutex); + result = g_hash_table_lookup (_format_to_nick, GINT_TO_POINTER (format)); + g_static_mutex_unlock (&mutex); + + return result; +} + +/** + * gst_format_iterate_definitions: + * + * Iterate all the registered formats. The format definition is read + * only. + * + * Returns: A GstIterator of #GstFormatDefinition. + */ +#ifdef __SYMBIAN32__ +EXPORT_C +#endif + +GstIterator * +gst_format_iterate_definitions (void) +{ + GstIterator *result; + + g_static_mutex_lock (&mutex); + /* FIXME: register a boxed type for GstFormatDefinition */ + result = gst_iterator_new_list (G_TYPE_POINTER, + g_static_mutex_get_mutex (&mutex), &_n_values, &_gst_formats, + NULL, NULL, NULL); + g_static_mutex_unlock (&mutex); + + return result; +}