/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * 2005 Wim Taymans * * gstquery.h: GstQuery API declaration * * 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. */ #ifndef __GST_QUERY_H__ #define __GST_QUERY_H__ #include #include #include #include #include G_BEGIN_DECLS /** * GstQueryType: * @GST_QUERY_NONE: invalid query type * @GST_QUERY_POSITION: current position in stream * @GST_QUERY_DURATION: total duration of the stream * @GST_QUERY_LATENCY: latency of stream * @GST_QUERY_JITTER: current jitter of stream * @GST_QUERY_RATE: current rate of the stream * @GST_QUERY_SEEKING: seeking capabilities * @GST_QUERY_SEGMENT: segment start/stop positions * @GST_QUERY_CONVERT: convert values between formats * @GST_QUERY_FORMATS: query supported formats for convert * @GST_QUERY_BUFFERING: query available media for efficient seeking. Since * 0.10.20. * @GST_QUERY_CUSTOM: a custom application or element defined query. Since * 0.10.22. * * Standard predefined Query types */ /* NOTE: don't forget to update the table in gstquery.c when changing * this enum */ typedef enum { GST_QUERY_NONE = 0, GST_QUERY_POSITION, GST_QUERY_DURATION, GST_QUERY_LATENCY, GST_QUERY_JITTER, /* not in draft-query, necessary? */ GST_QUERY_RATE, GST_QUERY_SEEKING, GST_QUERY_SEGMENT, GST_QUERY_CONVERT, GST_QUERY_FORMATS, GST_QUERY_BUFFERING, GST_QUERY_CUSTOM } GstQueryType; /** * GstBufferingMode: * @GST_BUFFERING_STREAM: a small amount of data is buffered * @GST_BUFFERING_DOWNLOAD: the stream is being downloaded * @GST_BUFFERING_TIMESHIFT: the stream is being downloaded in a ringbuffer * @GST_BUFFERING_LIVE: the stream is a live stream * * The different types of buffering methods. */ typedef enum { GST_BUFFERING_STREAM, GST_BUFFERING_DOWNLOAD, GST_BUFFERING_TIMESHIFT, GST_BUFFERING_LIVE } GstBufferingMode; typedef struct _GstQueryTypeDefinition GstQueryTypeDefinition; typedef struct _GstQuery GstQuery; typedef struct _GstQueryClass GstQueryClass; /** * GstQueryTypeDefinition: * @value: the unique id of the Query type * @nick: a short nick * @description: a longer description of the query type * @quark: the quark for the nick * * A Query Type definition */ struct _GstQueryTypeDefinition { GstQueryType value; gchar *nick; gchar *description; GQuark quark; }; #define GST_TYPE_QUERY (gst_query_get_type()) #define GST_IS_QUERY(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_QUERY)) #define GST_IS_QUERY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_QUERY)) #define GST_QUERY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_QUERY, GstQueryClass)) #define GST_QUERY(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_QUERY, GstQuery)) #define GST_QUERY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_QUERY, GstQueryClass)) /** * GST_QUERY_TYPE: * @query: the query to query * * Get the #GstQueryType of the query. */ #define GST_QUERY_TYPE(query) (((GstQuery*)(query))->type) /** * GST_QUERY_TYPE_NAME: * @query: the query to query * * Get a constant string representation of the #GstQueryType of the query. * * Since: 0.10.4 */ #define GST_QUERY_TYPE_NAME(query) (gst_query_type_get_name(GST_QUERY_TYPE(query))) /** * GstQuery: * @mini_object: The parent #GstMiniObject type * @type: the #GstQueryType * @structure: the #GstStructure containing the query details. * * The #GstQuery structure. */ struct _GstQuery { GstMiniObject mini_object; /*< public > *//* with COW */ GstQueryType type; GstStructure *structure; /*< private > */ gpointer _gst_reserved; }; struct _GstQueryClass { GstMiniObjectClass mini_object_class; /*< private > */ gpointer _gst_reserved[GST_PADDING]; }; const gchar* gst_query_type_get_name (GstQueryType query); GQuark gst_query_type_to_quark (GstQueryType query); GType gst_query_get_type (void); /* register a new query */ GstQueryType gst_query_type_register (const gchar *nick, const gchar *description); GstQueryType gst_query_type_get_by_nick (const gchar *nick); /* check if a query is in an array of querys */ gboolean gst_query_types_contains (const GstQueryType *types, GstQueryType type); /* query for query details */ G_CONST_RETURN GstQueryTypeDefinition* gst_query_type_get_details (GstQueryType type); GstIterator* gst_query_type_iterate_definitions (void); /* refcounting */ /** * gst_query_ref: * @q: a #GstQuery to increase the refcount of. * * Increases the refcount of the given query by one. */ #define gst_query_ref(q) GST_QUERY (gst_mini_object_ref (GST_MINI_OBJECT (q))) /** * gst_query_unref: * @q: a #GstQuery to decrease the refcount of. * * Decreases the refcount of the query. If the refcount reaches 0, the query * will be freed. */ #define gst_query_unref(q) gst_mini_object_unref (GST_MINI_OBJECT (q)) /* copy query */ /** * gst_query_copy: * @q: a #GstQuery to copy. * * Copies the given query using the copy function of the parent #GstData * structure. */ #define gst_query_copy(q) GST_QUERY (gst_mini_object_copy (GST_MINI_OBJECT (q))) /** * gst_query_make_writable: * @q: a #GstQuery to make writable * * Makes a writable query from the given query. */ #define gst_query_make_writable(q) GST_QUERY (gst_mini_object_make_writable (GST_MINI_OBJECT (q))) /* position query */ GstQuery* gst_query_new_position (GstFormat format); void gst_query_set_position (GstQuery *query, GstFormat format, gint64 cur); void gst_query_parse_position (GstQuery *query, GstFormat *format, gint64 *cur); /* duration query */ GstQuery* gst_query_new_duration (GstFormat format); void gst_query_set_duration (GstQuery *query, GstFormat format, gint64 duration); void gst_query_parse_duration (GstQuery *query, GstFormat *format, gint64 *duration); /* latency query */ GstQuery* gst_query_new_latency (void); void gst_query_set_latency (GstQuery *query, gboolean live, GstClockTime min_latency, GstClockTime max_latency); void gst_query_parse_latency (GstQuery *query, gboolean *live, GstClockTime *min_latency, GstClockTime *max_latency); /* convert query */ GstQuery* gst_query_new_convert (GstFormat src_format, gint64 value, GstFormat dest_format); void gst_query_set_convert (GstQuery *query, GstFormat src_format, gint64 src_value, GstFormat dest_format, gint64 dest_value); void gst_query_parse_convert (GstQuery *query, GstFormat *src_format, gint64 *src_value, GstFormat *dest_format, gint64 *dest_value); /* segment query */ GstQuery* gst_query_new_segment (GstFormat format); void gst_query_set_segment (GstQuery *query, gdouble rate, GstFormat format, gint64 start_value, gint64 stop_value); void gst_query_parse_segment (GstQuery *query, gdouble *rate, GstFormat *format, gint64 *start_value, gint64 *stop_value); /* application specific query */ GstQuery * gst_query_new_application (GstQueryType type, GstStructure *structure); GstStructure * gst_query_get_structure (GstQuery *query); /* seeking query */ GstQuery* gst_query_new_seeking (GstFormat format); void gst_query_set_seeking (GstQuery *query, GstFormat format, gboolean seekable, gint64 segment_start, gint64 segment_end); void gst_query_parse_seeking (GstQuery *query, GstFormat *format, gboolean *seekable, gint64 *segment_start, gint64 *segment_end); /* formats query */ GstQuery* gst_query_new_formats (void); void gst_query_set_formats (GstQuery *query, gint n_formats, ...); void gst_query_set_formatsv (GstQuery *query, gint n_formats, GstFormat *formats); void gst_query_parse_formats_length (GstQuery *query, guint *n_formats); void gst_query_parse_formats_nth (GstQuery *query, guint nth, GstFormat *format); /* buffering query */ GstQuery* gst_query_new_buffering (GstFormat format); void gst_query_set_buffering_percent (GstQuery *query, gboolean busy, gint percent); void gst_query_parse_buffering_percent (GstQuery *query, gboolean *busy, gint *percent); void gst_query_set_buffering_stats (GstQuery *query, GstBufferingMode mode, gint avg_in, gint avg_out, gint64 buffering_left); void gst_query_parse_buffering_stats (GstQuery *query, GstBufferingMode *mode, gint *avg_in, gint *avg_out, gint64 *buffering_left); void gst_query_set_buffering_range (GstQuery *query, GstFormat format, gint64 start, gint64 stop, gint64 estimated_total); void gst_query_parse_buffering_range (GstQuery *query, GstFormat *format, gint64 *start, gint64 *stop, gint64 *estimated_total); G_END_DECLS #endif /* __GST_QUERY_H__ */