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Use some hashtables instead of a linked list
Original commit message from CVS: Use some hashtables instead of a linked list
This commit is contained in:
Iain Holmes
parent
dc449746bb
commit
4b93f5a554
3 changed files with 53 additions and 58 deletions
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@ -27,17 +27,10 @@
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#include "gstformat.h"
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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 gint _n_values = 1; /* we start from 1 because 0 reserved for UNDEFINED */
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typedef struct _GstFormatDefinition GstFormatDefinition;
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struct _GstFormatDefinition
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{
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GstFormat value;
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gchar *nick;
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gchar *description;
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};
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static GstFormatDefinition standard_definitions[] = {
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{ GST_FORMAT_DEFAULT, "default", "Default" },
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{ GST_FORMAT_BYTES, "bytes", "Bytes" },
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@ -53,8 +46,16 @@ _gst_format_initialize (void)
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{
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GstFormatDefinition *standards = standard_definitions;
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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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_gst_formats = g_list_prepend (_gst_formats, standards);
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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), 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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@ -89,8 +90,9 @@ gst_format_register (const gchar *nick, const gchar *description)
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format->nick = g_strdup (nick);
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format->description = g_strdup (description);
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_gst_formats = g_list_prepend (_gst_formats, format);
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g_hash_table_insert (_nick_to_format, format->nick, format);
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g_hash_table_insert (_format_to_nick, GINT_TO_POINTER (format->value), format);
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_gst_formats = g_list_append (_gst_formats, format);
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_n_values++;
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return format->value;
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@ -108,57 +110,41 @@ gst_format_register (const gchar *nick, const gchar *description)
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GstFormat
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gst_format_get_by_nick (const gchar *nick)
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{
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GList *walk;
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GstFormatDefinition *format;
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g_return_val_if_fail (nick != NULL, 0);
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walk = _gst_formats;
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format = g_hash_table_lookup (_nick_to_format, nick);
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while (walk) {
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format = (GstFormatDefinition *) walk->data;
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if (!strcmp (format->nick, nick))
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if (format != NULL)
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return format->value;
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walk = g_list_next (walk);
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}
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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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* gst_format_get_details:
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* @format: The format to get details of
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* @nick: The nick of the format
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* @description: The description of the format
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*
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* Get details about the given format.
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*
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* Returns: TRUE if the format was registered, FALSE otherwise
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* Returns: The #GstFormatDefinition for @format or NULL on failure.
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*/
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gboolean
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gst_format_get_details (GstFormat format, const gchar **nick, const gchar **description)
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const GstFormatDefinition *
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gst_format_get_details (GstFormat format)
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{
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GList *walk;
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GstFormatDefinition *walk_format;
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g_return_val_if_fail (nick != NULL, FALSE);
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g_return_val_if_fail (description != NULL, FALSE);
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walk = _gst_formats;
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while (walk) {
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walk_format = (GstFormatDefinition *) walk->data;
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if (walk_format->value == format) {
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*nick = walk_format->nick;
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*description = walk_format->description;
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return TRUE;
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}
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walk = g_list_next (walk);
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}
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return FALSE;
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return g_hash_table_lookup (_format_to_nick, GINT_TO_POINTER (format));
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}
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/**
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* gst_format_get_definitions:
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*
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* Get a list of all the registered formats.
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*
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* Returns: A GList of #GstFormatDefinition.
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*/
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const GList *
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gst_format_get_definitions (void)
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{
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return _gst_formats;
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}
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@ -40,6 +40,14 @@ typedef enum {
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GST_FORMAT_UNITS = 6,
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} GstFormat;
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typedef struct _GstFormatDefinition GstFormatDefinition;
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struct _GstFormatDefinition
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{
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GstFormat value;
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gchar *nick;
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gchar *description;
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};
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#define GST_FORMATS_FUNCTION(functionname, a...) \
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static const GstFormat* \
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functionname (GstPad *pad) \
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@ -59,8 +67,8 @@ GstFormat gst_format_register (const gchar *nick, const gchar *description);
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GstFormat gst_format_get_by_nick (const gchar *nick);
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/* query for format details */
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gboolean gst_format_get_details (GstFormat format, const gchar **nick, const gchar **description);
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const GstFormatDefinition * gst_format_get_details (GstFormat format);
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const GList * gst_format_get_definitions (void);
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G_END_DECLS
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@ -137,11 +137,12 @@ static void
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print_formats (const GstFormat *formats)
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{
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while (formats && *formats) {
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const gchar *nick;
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const gchar *description;
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const GstFormatDefinition *definition;
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if (gst_format_get_details (*formats, &nick, &description))
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g_print ("\t\t(%d):\t%s (%s)\n", *formats, nick, description);
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definition = gst_format_get_details (*formats);
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if (definition)
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g_print ("\t\t(%d):\t%s (%s)\n", *formats,
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definition->nick, definition->description);
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else
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g_print ("\t\t(%d):\tUnknown format\n", *formats);
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