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gstreamer/gst/gstquery.h
Wim Taymans 0bd5a78701 query: pass allocator in query 
Place the allocator object in the ALLOCATION query instead of the name. This
allows us to exchange allocators that are not in the global pool of allocators.
Update elements for the new api
2012-01-30 16:13:31 +01:00

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wim.taymans@chello.be>
* 2005 Wim Taymans <wim@fluendo.com>
* 2011 Wim Taymans <wim.taymans@gmail.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>
#include <gst/gstpad.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.
* @GST_QUERY_CUSTOM: a custom application or element defined query. Since
* 0.10.22.
* @GST_QUERY_URI: query the URI of the source or sink. Since 0.10.22.
* @GST_QUERY_ALLOCATION: the buffer allocation properties
* @GST_QUERY_SCHEDULING: the scheduling properties
* @GST_QUERY_ACCEPT_CAPS: the accept caps query
* @GST_QUERY_CAPS: the caps query
*
* 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,
GST_QUERY_URI,
GST_QUERY_ALLOCATION,
GST_QUERY_SCHEDULING,
GST_QUERY_ACCEPT_CAPS,
GST_QUERY_CAPS
} GstQueryType;
typedef struct _GstQueryTypeDefinition GstQueryTypeDefinition;
typedef struct _GstQuery GstQuery;
/**
* 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;
const gchar *nick;
const gchar *description;
GQuark quark;
};
#define GST_TYPE_QUERY (gst_query_get_type())
#define GST_IS_QUERY(obj) (GST_IS_MINI_OBJECT_TYPE (obj, GST_TYPE_QUERY))
#define GST_QUERY_CAST(obj) ((GstQuery*)(obj))
#define GST_QUERY(obj) (GST_QUERY_CAST(obj))
/**
* 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
*
* The #GstQuery structure.
*/
struct _GstQuery
{
GstMiniObject mini_object;
/*< public > *//* with COW */
GstQueryType type;
};
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 */
const GstQueryTypeDefinition*
gst_query_type_get_details (GstQueryType type);
GstIterator* gst_query_type_iterate_definitions (void) G_GNUC_MALLOC;
/* refcounting */
/**
* gst_query_ref:
* @q: a #GstQuery to increase the refcount of.
*
* Increases the refcount of the given query by one.
*
* Returns: @q
*/
#ifdef _FOOL_GTK_DOC_
G_INLINE_FUNC GstQuery * gst_query_ref (GstQuery * q);
#endif
static inline GstQuery *
gst_query_ref (GstQuery * q)
{
return GST_QUERY_CAST (gst_mini_object_ref (GST_MINI_OBJECT_CAST (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.
*/
#ifdef _FOOL_GTK_DOC_
G_INLINE_FUNC void gst_query_unref (GstQuery * q);
#endif
static inline void
gst_query_unref (GstQuery * q)
{
gst_mini_object_unref (GST_MINI_OBJECT_CAST (q));
}
/* copy query */
/**
* gst_query_copy:
* @q: a #GstQuery to copy.
*
* Copies the given query using the copy function of the parent #GstStructure.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new copy of @q.
*/
#ifdef _FOOL_GTK_DOC_
G_INLINE_FUNC GstQuery * gst_query_copy (const GstQuery * q);
#endif
static inline GstQuery *
gst_query_copy (const GstQuery * q)
{
return GST_QUERY_CAST (gst_mini_object_copy (GST_MINI_OBJECT_CONST_CAST (q)));
}
/**
* gst_query_is_writable:
* @q: a #GstQuery
*
* Tests if you can safely write data into a query's structure.
*/
#define gst_query_is_writable(q) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (q))
/**
* gst_query_make_writable:
* @q: (transfer full): a #GstQuery to make writable
*
* Makes a writable query from the given query.
*
* Returns: (transfer full): a new writable query (possibly same as @q)
*/
#define gst_query_make_writable(q) GST_QUERY_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (q)))
/**
* gst_query_replace:
* @old_query: (inout) (transfer full): pointer to a pointer to a #GstQuery
* to be replaced.
* @new_query: (allow-none) (transfer none): pointer to a #GstQuery that will
* replace the query pointed to by @old_query.
*
* Modifies a pointer to a #GstQuery to point to a different #GstQuery. The
* modification is done atomically (so this is useful for ensuring thread safety
* in some cases), and the reference counts are updated appropriately (the old
* query is unreffed, the new one is reffed).
*
* Either @new_query or the #GstQuery pointed to by @old_query may be NULL.
*
* Returns: TRUE if @new_query was different from @old_query
*/
#ifdef _FOOL_GTK_DOC_
G_INLINE_FUNC gboolean gst_query_replace (GstQuery **old_query, GstQuery *new_query);
#endif
static inline gboolean
gst_query_replace (GstQuery **old_query, GstQuery *new_query)
{
return gst_mini_object_replace ((GstMiniObject **) old_query, (GstMiniObject *) new_query);
}
/* application specific query */
GstQuery * gst_query_new_custom (GstQueryType type, GstStructure *structure) G_GNUC_MALLOC;
const GstStructure *
gst_query_get_structure (GstQuery *query);
GstStructure * gst_query_writable_structure (GstQuery *query);
/* position query */
GstQuery* gst_query_new_position (GstFormat format) G_GNUC_MALLOC;
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) G_GNUC_MALLOC;
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) G_GNUC_MALLOC;
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) G_GNUC_MALLOC;
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) G_GNUC_MALLOC;
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);
/* seeking query */
GstQuery* gst_query_new_seeking (GstFormat format) G_GNUC_MALLOC;
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) G_GNUC_MALLOC;
void gst_query_set_formats (GstQuery *query, gint n_formats, ...);
void gst_query_set_formatsv (GstQuery *query, gint n_formats, const GstFormat *formats);
void gst_query_parse_n_formats (GstQuery *query, guint *n_formats);
void gst_query_parse_nth_format (GstQuery *query, guint nth, GstFormat *format);
/* buffering query */
/**
* 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;
GstQuery* gst_query_new_buffering (GstFormat format) G_GNUC_MALLOC;
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);
gboolean gst_query_add_buffering_range (GstQuery *query,
gint64 start, gint64 stop);
guint gst_query_get_n_buffering_ranges (GstQuery *query);
gboolean gst_query_parse_nth_buffering_range (GstQuery *query,
guint index, gint64 *start,
gint64 *stop);
/* URI query */
GstQuery * gst_query_new_uri (void) G_GNUC_MALLOC;
void gst_query_parse_uri (GstQuery *query, gchar **uri);
void gst_query_set_uri (GstQuery *query, const gchar *uri);
/* allocation query */
GstQuery * gst_query_new_allocation (GstCaps *caps, gboolean need_pool) G_GNUC_MALLOC;
void gst_query_parse_allocation (GstQuery *query, GstCaps **caps, gboolean *need_pool);
void gst_query_set_allocation_params (GstQuery *query, guint size, guint min_buffers,
guint max_buffers, guint prefix, guint alignment,
GstBufferPool *pool);
void gst_query_parse_allocation_params (GstQuery *query, guint *size, guint *min_buffers,
guint *max_buffers, guint *prefix, guint *alignment,
GstBufferPool **pool);
void gst_query_add_allocation_meta (GstQuery *query, const gchar *api);
guint gst_query_get_n_allocation_metas (GstQuery *query);
const gchar * gst_query_parse_nth_allocation_meta (GstQuery *query, guint index);
gboolean gst_query_has_allocation_meta (GstQuery *query, const gchar *api);
void gst_query_add_allocation_memory (GstQuery *query, GstAllocator *allocator);
guint gst_query_get_n_allocation_memories (GstQuery *query);
GstAllocator * gst_query_parse_nth_allocation_memory (GstQuery *query, guint index);
/* scheduling query */
/**
* GstSchedulingFlags:
* @GST_SCHEDULING_FLAG_SEEKABLE: if seeking is possible
* @GST_SCHEDULING_FLAG_SEQUENTIAL: if sequential access is recommended
*
* The different scheduling flags.
*/
typedef enum {
GST_SCHEDULING_FLAG_SEEKABLE = (1 << 0),
GST_SCHEDULING_FLAG_SEQUENTIAL = (1 << 1)
} GstSchedulingFlags;
GstQuery * gst_query_new_scheduling (void) G_GNUC_MALLOC;
void gst_query_set_scheduling (GstQuery *query, GstSchedulingFlags flags,
gint minsize, gint maxsize, gint align);
void gst_query_parse_scheduling (GstQuery *query, GstSchedulingFlags *flags,
gint *minsize, gint *maxsize, gint *align);
void gst_query_add_scheduling_mode (GstQuery *query, GstPadMode mode);
guint gst_query_get_n_scheduling_modes (GstQuery *query);
GstPadMode gst_query_parse_nth_scheduling_mode (GstQuery *query, guint index);
gboolean gst_query_has_scheduling_mode (GstQuery *query, GstPadMode mode);
/* accept-caps query */
GstQuery * gst_query_new_accept_caps (GstCaps *caps) G_GNUC_MALLOC;
void gst_query_parse_accept_caps (GstQuery *query, GstCaps **caps);
void gst_query_set_accept_caps_result (GstQuery *query, gboolean result);
void gst_query_parse_accept_caps_result (GstQuery *query, gboolean *result);
/* caps query */
GstQuery * gst_query_new_caps (GstCaps *filter) G_GNUC_MALLOC;
void gst_query_parse_caps (GstQuery *query, GstCaps **filter);
void gst_query_set_caps_result (GstQuery *query, GstCaps *caps);
void gst_query_parse_caps_result (GstQuery *query, GstCaps **caps);
void gst_query_intersect_caps_result (GstQuery *query, GstCaps *filter,
GstCapsIntersectMode mode);
G_END_DECLS
#endif /* __GST_QUERY_H__ */
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