| /* GStreamer |
| * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu> |
| * 2000 Wim Taymans <wim.taymans@chello.be> |
| * 2005 Wim Taymans <wim@fluendo.com> |
| * |
| * 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 <glib.h> |
| |
| #include <gst/gstiterator.h> |
| #include <gst/gstminiobject.h> |
| #include <gst/gststructure.h> |
| #include <gst/gstformat.h> |
| |
| 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. |
| * |
| * 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 |
| } 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__ */ |
| |
