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gstreamer/gst/gstquery.h
Wim Taymans 83af60019e query: rework the ALLOCATION query 
Separate the bufferpool and allocator hints in the allocation query, some
of the values don't always make sense together.
Keep the bufferpool and its configuration together.
Keep the allocator and its parameters together.
Allow for multiple bufferpool configurations in the query.
2012-03-15 20:23:59 +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
typedef struct _GstQuery GstQuery;
/**
* GstQueryTypeFlags:
* @GST_QUERY_TYPE_UPSTREAM: Set if the query can travel upstream.
* @GST_QUERY_TYPE_DOWNSTREAM: Set if the query can travel downstream.
* @GST_QUERY_TYPE_SERIALIZED: Set if the query should be serialized with data
* flow.
*
* #GstQueryTypeFlags indicate the aspects of the different #GstQueryType
* values. You can get the type flags of a #GstQueryType with the
* gst_query_type_get_flags() function.
*/
typedef enum {
GST_QUERY_TYPE_UPSTREAM = 1 << 0,
GST_QUERY_TYPE_DOWNSTREAM = 1 << 1,
GST_QUERY_TYPE_SERIALIZED = 1 << 2
} GstQueryTypeFlags;
/**
* GST_QUERY_TYPE_BOTH:
*
* The same thing as #GST_QUERY_TYPE_UPSTREAM | #GST_QUERY_TYPE_DOWNSTREAM.
*/
#define GST_QUERY_TYPE_BOTH \
(GST_QUERY_TYPE_UPSTREAM | GST_QUERY_TYPE_DOWNSTREAM)
#define GST_QUERY_NUM_SHIFT (8)
/**
* GST_QUERY_MAKE_TYPE:
* @num: the query number to create
* @idx: the index in the sticky array
* @flags: the query flags
*
* when making custom query types, use this macro with the num and
* the given flags
*/
#define GST_QUERY_MAKE_TYPE(num,flags) \
(((num) << GST_QUERY_NUM_SHIFT) | (flags))
#define FLAG(name) GST_QUERY_TYPE_##name
/**
* GstQueryType:
* @GST_QUERY_UNKNOWN: unknown 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
* @GST_QUERY_DRAIN: wait till all serialized data is consumed downstream
*
* Standard predefined Query types
*/
/* NOTE: don't forget to update the table in gstquery.c when changing
* this enum */
typedef enum {
GST_QUERY_UNKNOWN = GST_QUERY_MAKE_TYPE (0, 0),
GST_QUERY_POSITION = GST_QUERY_MAKE_TYPE (10, FLAG(BOTH)),
GST_QUERY_DURATION = GST_QUERY_MAKE_TYPE (20, FLAG(BOTH)),
GST_QUERY_LATENCY = GST_QUERY_MAKE_TYPE (30, FLAG(BOTH)),
GST_QUERY_JITTER = GST_QUERY_MAKE_TYPE (40, FLAG(BOTH)),
GST_QUERY_RATE = GST_QUERY_MAKE_TYPE (50, FLAG(BOTH)),
GST_QUERY_SEEKING = GST_QUERY_MAKE_TYPE (60, FLAG(BOTH)),
GST_QUERY_SEGMENT = GST_QUERY_MAKE_TYPE (70, FLAG(BOTH)),
GST_QUERY_CONVERT = GST_QUERY_MAKE_TYPE (80, FLAG(BOTH)),
GST_QUERY_FORMATS = GST_QUERY_MAKE_TYPE (90, FLAG(BOTH)),
GST_QUERY_BUFFERING = GST_QUERY_MAKE_TYPE (110, FLAG(BOTH)),
GST_QUERY_CUSTOM = GST_QUERY_MAKE_TYPE (120, FLAG(BOTH)),
GST_QUERY_URI = GST_QUERY_MAKE_TYPE (130, FLAG(BOTH)),
GST_QUERY_ALLOCATION = GST_QUERY_MAKE_TYPE (140, FLAG(DOWNSTREAM) | FLAG(SERIALIZED)),
GST_QUERY_SCHEDULING = GST_QUERY_MAKE_TYPE (150, FLAG(UPSTREAM)),
GST_QUERY_ACCEPT_CAPS = GST_QUERY_MAKE_TYPE (160, FLAG(BOTH)),
GST_QUERY_CAPS = GST_QUERY_MAKE_TYPE (170, FLAG(BOTH)),
GST_QUERY_DRAIN = GST_QUERY_MAKE_TYPE (180, FLAG(DOWNSTREAM) | FLAG(SERIALIZED))
} GstQueryType;
#undef FLAG
#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)))
/**
* GST_QUERY_IS_UPSTREAM:
* @ev: the query to query
*
* Check if an query can travel upstream.
*/
#define GST_QUERY_IS_UPSTREAM(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_UPSTREAM)
/**
* GST_QUERY_IS_DOWNSTREAM:
* @ev: the query to query
*
* Check if an query can travel downstream.
*/
#define GST_QUERY_IS_DOWNSTREAM(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_DOWNSTREAM)
/**
* GST_QUERY_IS_SERIALIZED:
* @ev: the query to query
*
* Check if an query is serialized with the data stream.
*/
#define GST_QUERY_IS_SERIALIZED(ev) !!(GST_QUERY_TYPE (ev) & GST_QUERY_TYPE_SERIALIZED)
/**
* 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 type);
GQuark gst_query_type_to_quark (GstQueryType type);
GstQueryTypeFlags
gst_query_type_get_flags (GstQueryType type);
GType gst_query_get_type (void);
/* 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);
/* pools */
void gst_query_add_allocation_pool (GstQuery *query, GstBufferPool *pool,
guint size, guint min_buffers,
guint max_buffers);
guint gst_query_get_n_allocation_pools (GstQuery *query);
void gst_query_parse_nth_allocation_pool (GstQuery *query, guint index,
GstBufferPool **pool,
guint *size, guint *min_buffers,
guint *max_buffers);
void gst_query_set_nth_allocation_pool (GstQuery *query, guint index,
GstBufferPool *pool,
guint size, guint min_buffers,
guint max_buffers);
/* allocators */
void gst_query_add_allocation_param (GstQuery *query, GstAllocator *allocator,
const GstAllocationParams *params);
guint gst_query_get_n_allocation_params (GstQuery *query);
void gst_query_parse_nth_allocation_param (GstQuery *query, guint index,
GstAllocator **allocator,
GstAllocationParams *params);
void gst_query_set_nth_allocation_param (GstQuery *query, guint index,
GstAllocator *allocator,
const GstAllocationParams *params);
/* metadata */
void gst_query_add_allocation_meta (GstQuery *query, GType api);
guint gst_query_get_n_allocation_metas (GstQuery *query);
GType gst_query_parse_nth_allocation_meta (GstQuery *query, guint index);
void gst_query_remove_nth_allocation_meta (GstQuery *query, guint index);
gboolean gst_query_has_allocation_meta (GstQuery *query, GType api);
/* 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);
/* drain query */
GstQuery * gst_query_new_drain (void) G_GNUC_MALLOC;
G_END_DECLS
#endif /* __GST_QUERY_H__ */
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