| /* GStreamer |
| * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> |
| * 2000 Wim Taymans <wim.taymans@chello.be> |
| * 2005 Wim Taymans <wim@fluendo.com> |
| * |
| * 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., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, 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 <string.h> |
| #include "gstformat.h" |
| #include "gstenumtypes.h" |
| |
| static GMutex mutex; |
| 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}, |
| {GST_FORMAT_UNDEFINED, NULL, NULL, 0} |
| }; |
| |
| void |
| _priv_gst_format_initialize (void) |
| { |
| GstFormatDefinition *standards = standard_definitions; |
| |
| g_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, (gpointer) 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_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. |
| */ |
| 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. |
| */ |
| 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. |
| */ |
| GstFormat |
| gst_format_register (const gchar * nick, const gchar * description) |
| { |
| GstFormatDefinition *format; |
| GstFormat query; |
| |
| g_return_val_if_fail (nick != NULL, GST_FORMAT_UNDEFINED); |
| g_return_val_if_fail (description != NULL, GST_FORMAT_UNDEFINED); |
| |
| query = gst_format_get_by_nick (nick); |
| if (query != GST_FORMAT_UNDEFINED) |
| return query; |
| |
| g_mutex_lock (&mutex); |
| format = g_slice_new (GstFormatDefinition); |
| format->value = (GstFormat) _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, (gpointer) 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_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. |
| */ |
| GstFormat |
| gst_format_get_by_nick (const gchar * nick) |
| { |
| GstFormatDefinition *format; |
| |
| g_return_val_if_fail (nick != NULL, GST_FORMAT_UNDEFINED); |
| |
| g_mutex_lock (&mutex); |
| format = g_hash_table_lookup (_nick_to_format, nick); |
| g_mutex_unlock (&mutex); |
| |
| if (format != NULL) |
| return format->value; |
| else |
| return GST_FORMAT_UNDEFINED; |
| } |
| |
| /** |
| * gst_formats_contains: |
| * @formats: (array zero-terminated=1): 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 |
| */ |
| 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. |
| */ |
| const GstFormatDefinition * |
| gst_format_get_details (GstFormat format) |
| { |
| const GstFormatDefinition *result; |
| |
| g_mutex_lock (&mutex); |
| result = g_hash_table_lookup (_format_to_nick, GINT_TO_POINTER (format)); |
| g_mutex_unlock (&mutex); |
| |
| return result; |
| } |
| |
| /** |
| * gst_format_iterate_definitions: |
| * |
| * Iterate all the registered formats. The format definition is read |
| * only. |
| * |
| * Returns: (transfer full): a GstIterator of #GstFormatDefinition. |
| */ |
| GstIterator * |
| gst_format_iterate_definitions (void) |
| { |
| GstIterator *result; |
| |
| g_mutex_lock (&mutex); |
| /* FIXME: register a boxed type for GstFormatDefinition */ |
| result = gst_iterator_new_list (G_TYPE_POINTER, |
| &mutex, &_n_values, &_gst_formats, NULL, NULL); |
| g_mutex_unlock (&mutex); |
| |
| return result; |
| } |