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gstreamer/gst/gstquery.c
Wim Taymans e80296cf46 meta: split registration of API and implementation 
Split out the registration of the metadata API and its implementation. Make a
GType for each metadata API. This allows us to store extra information with the
API type such as the tags.
Change the buffer API so that we can get the metadata using the API GType.
Change the query API so that we use the metadata API GType in the allocation
query instead of a string.
Update netaddress and unit tests
2012-02-29 17:37:09 +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>
*
* gstquery.c: GstQueryType registration and Query parsing/creation
*
* 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.
*/
/**
* SECTION:gstquery
* @short_description: Dynamically register new query types. Provide functions
* to create queries, and to set and parse values in them.
* @see_also: #GstPad, #GstElement
*
* GstQuery functions are used to register new query types to the gstreamer
* core and use them.
* Queries can be performed on pads (gst_pad_query()) and elements
* (gst_element_query()). Please note that some queries might need a running
* pipeline to work.
*
* Queries can be created using the gst_query_new_*() functions.
* Query values can be set using gst_query_set_*(), and parsed using
* gst_query_parse_*() helpers.
*
* The following example shows how to query the duration of a pipeline:
*
* <example>
* <title>Query duration on a pipeline</title>
* <programlisting>
* GstQuery *query;
* gboolean res;
* query = gst_query_new_duration (GST_FORMAT_TIME);
* res = gst_element_query (pipeline, query);
* if (res) {
* gint64 duration;
* gst_query_parse_duration (query, NULL, &amp;duration);
* g_print ("duration = %"GST_TIME_FORMAT, GST_TIME_ARGS (duration));
* }
* else {
* g_print ("duration query failed...");
* }
* gst_query_unref (query);
* </programlisting>
* </example>
*
* Last reviewed on 2006-02-14 (0.10.4)
*/
#include "gst_private.h"
#include "gstinfo.h"
#include "gstquery.h"
#include "gstvalue.h"
#include "gstenumtypes.h"
#include "gstquark.h"
#include "gsturi.h"
#include "gstbufferpool.h"
GST_DEBUG_CATEGORY_STATIC (gst_query_debug);
#define GST_CAT_DEFAULT gst_query_debug
static GType _gst_query_type = 0;
typedef struct
{
GstQuery query;
GstStructure *structure;
} GstQueryImpl;
#define GST_QUERY_STRUCTURE(q) (((GstQueryImpl *)(q))->structure)
/* GstQueryBufferingRange: internal struct for GArray */
typedef struct
{
gint64 start;
gint64 stop;
} GstQueryBufferingRange;
static GMutex mutex;
static GList *_gst_queries = NULL;
static GHashTable *_nick_to_query = NULL;
static GHashTable *_query_type_to_nick = NULL;
static guint32 _n_values = 1; /* we start from 1 because 0 reserved for NONE */
static GstQueryTypeDefinition standard_definitions[] = {
{GST_QUERY_POSITION, "position", "Current position", 0},
{GST_QUERY_DURATION, "duration", "Total duration", 0},
{GST_QUERY_LATENCY, "latency", "Latency", 0},
{GST_QUERY_JITTER, "jitter", "Jitter", 0},
{GST_QUERY_RATE, "rate", "Configured rate 1000000 = 1", 0},
{GST_QUERY_SEEKING, "seeking", "Seeking capabilities and parameters", 0},
{GST_QUERY_SEGMENT, "segment", "currently configured segment", 0},
{GST_QUERY_CONVERT, "convert", "Converting between formats", 0},
{GST_QUERY_FORMATS, "formats", "Supported formats for conversion", 0},
{GST_QUERY_BUFFERING, "buffering", "Buffering status", 0},
{GST_QUERY_CUSTOM, "custom", "Custom query", 0},
{GST_QUERY_URI, "uri", "URI of the source or sink", 0},
{GST_QUERY_ALLOCATION, "allocation", "Allocation properties", 0},
{GST_QUERY_SCHEDULING, "scheduling", "Scheduling properties", 0},
{GST_QUERY_ACCEPT_CAPS, "accept-caps", "Accept caps", 0},
{GST_QUERY_CAPS, "caps", "Caps", 0},
{GST_QUERY_NONE, NULL, NULL, 0}
};
GST_DEFINE_MINI_OBJECT_TYPE (GstQuery, gst_query);
void
_priv_gst_query_initialize (void)
{
GstQueryTypeDefinition *standards = standard_definitions;
GST_CAT_INFO (GST_CAT_GST_INIT, "init queries");
GST_DEBUG_CATEGORY_INIT (gst_query_debug, "query", 0, "query system");
g_mutex_lock (&mutex);
if (_nick_to_query == NULL) {
_nick_to_query = g_hash_table_new (g_str_hash, g_str_equal);
_query_type_to_nick = g_hash_table_new (NULL, NULL);
}
while (standards->nick) {
standards->quark = g_quark_from_static_string (standards->nick);
g_hash_table_insert (_nick_to_query, (gpointer) standards->nick, standards);
g_hash_table_insert (_query_type_to_nick,
GINT_TO_POINTER (standards->value), standards);
_gst_queries = g_list_append (_gst_queries, standards);
standards++;
_n_values++;
}
g_mutex_unlock (&mutex);
_gst_query_type = gst_query_get_type ();
}
/**
* gst_query_type_get_name:
* @query: the query type
*
* Get a printable name for the given query type. Do not modify or free.
*
* Returns: a reference to the static name of the query.
*/
const gchar *
gst_query_type_get_name (GstQueryType query)
{
const GstQueryTypeDefinition *def;
def = gst_query_type_get_details (query);
g_return_val_if_fail (def != NULL, NULL);
return def->nick;
}
/**
* gst_query_type_to_quark:
* @query: the query type
*
* Get the unique quark for the given query type.
*
* Returns: the quark associated with the query type
*/
GQuark
gst_query_type_to_quark (GstQueryType query)
{
const GstQueryTypeDefinition *def;
def = gst_query_type_get_details (query);
g_return_val_if_fail (def != NULL, 0);
return def->quark;
}
/**
* gst_query_type_register:
* @nick: The nick of the new query
* @description: The description of the new query
*
* Create a new GstQueryType based on the nick or return an
* already registered query with that nick
*
* Returns: A new GstQueryType or an already registered query
* with the same nick.
*/
GstQueryType
gst_query_type_register (const gchar * nick, const gchar * description)
{
GstQueryTypeDefinition *query;
GstQueryType lookup;
g_return_val_if_fail (nick != NULL, GST_QUERY_NONE);
g_return_val_if_fail (description != NULL, GST_QUERY_NONE);
lookup = gst_query_type_get_by_nick (nick);
if (lookup != GST_QUERY_NONE)
return lookup;
query = g_slice_new (GstQueryTypeDefinition);
query->value = (GstQueryType) _n_values;
query->nick = g_strdup (nick);
query->description = g_strdup (description);
query->quark = g_quark_from_static_string (query->nick);
g_mutex_lock (&mutex);
g_hash_table_insert (_nick_to_query, (gpointer) query->nick, query);
g_hash_table_insert (_query_type_to_nick, GINT_TO_POINTER (query->value),
query);
_gst_queries = g_list_append (_gst_queries, query);
_n_values++;
g_mutex_unlock (&mutex);
return query->value;
}
/**
* gst_query_type_get_by_nick:
* @nick: The nick of the query
*
* Get the query type registered with @nick.
*
* Returns: The query registered with @nick or #GST_QUERY_NONE
* if the query was not registered.
*/
GstQueryType
gst_query_type_get_by_nick (const gchar * nick)
{
GstQueryTypeDefinition *query;
g_return_val_if_fail (nick != NULL, GST_QUERY_NONE);
g_mutex_lock (&mutex);
query = g_hash_table_lookup (_nick_to_query, nick);
g_mutex_unlock (&mutex);
if (query != NULL)
return query->value;
else
return GST_QUERY_NONE;
}
/**
* gst_query_types_contains:
* @types: The query array to search
* @type: the #GstQueryType to find
*
* See if the given #GstQueryType is inside the @types query types array.
*
* Returns: TRUE if the type is found inside the array
*/
gboolean
gst_query_types_contains (const GstQueryType * types, GstQueryType type)
{
if (!types)
return FALSE;
while (*types) {
if (*types == type)
return TRUE;
types++;
}
return FALSE;
}
/**
* gst_query_type_get_details:
* @type: a #GstQueryType
*
* Get details about the given #GstQueryType.
*
* Returns: The #GstQueryTypeDefinition for @type or NULL on failure.
*/
const GstQueryTypeDefinition *
gst_query_type_get_details (GstQueryType type)
{
const GstQueryTypeDefinition *result;
g_mutex_lock (&mutex);
result = g_hash_table_lookup (_query_type_to_nick, GINT_TO_POINTER (type));
g_mutex_unlock (&mutex);
return result;
}
/**
* gst_query_type_iterate_definitions:
*
* Get a #GstIterator of all the registered query types. The definitions
* iterated over are read only.
*
* Free-function: gst_iterator_free
*
* Returns: (transfer full): a #GstIterator of #GstQueryTypeDefinition.
*/
GstIterator *
gst_query_type_iterate_definitions (void)
{
GstIterator *result;
g_mutex_lock (&mutex);
/* FIXME: register a boxed type for GstQueryTypeDefinition */
result = gst_iterator_new_list (G_TYPE_POINTER,
&mutex, &_n_values, &_gst_queries, NULL, NULL);
g_mutex_unlock (&mutex);
return result;
}
static void
_gst_query_free (GstQuery * query)
{
GstStructure *s;
g_return_if_fail (query != NULL);
s = GST_QUERY_STRUCTURE (query);
if (s) {
gst_structure_set_parent_refcount (s, NULL);
gst_structure_free (s);
}
g_slice_free1 (GST_MINI_OBJECT_SIZE (query), query);
}
static GstQuery *
_gst_query_copy (GstQuery * query)
{
GstQuery *copy;
copy = gst_query_new_custom (query->type, GST_QUERY_STRUCTURE (query));
return copy;
}
static void
gst_query_init (GstQueryImpl * query, gsize size, GstQueryType type)
{
gst_mini_object_init (GST_MINI_OBJECT_CAST (query), _gst_query_type, size);
query->query.mini_object.copy = (GstMiniObjectCopyFunction) _gst_query_copy;
query->query.mini_object.free = (GstMiniObjectFreeFunction) _gst_query_free;
GST_EVENT_TYPE (query) = type;
}
/**
* gst_query_new_position:
* @format: the default #GstFormat for the new query
*
* Constructs a new query stream position query object. Use gst_query_unref()
* when done with it. A position query is used to query the current position
* of playback in the streams, in some format.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*/
GstQuery *
gst_query_new_position (GstFormat format)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (QUERY_POSITION),
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (CURRENT), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
query = gst_query_new_custom (GST_QUERY_POSITION, structure);
return query;
}
/**
* gst_query_set_position:
* @query: a #GstQuery with query type GST_QUERY_POSITION
* @format: the requested #GstFormat
* @cur: the position to set
*
* Answer a position query by setting the requested value in the given format.
*/
void
gst_query_set_position (GstQuery * query, GstFormat format, gint64 cur)
{
GstStructure *s;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_POSITION);
s = GST_QUERY_STRUCTURE (query);
g_return_if_fail (format == g_value_get_enum (gst_structure_id_get_value (s,
GST_QUARK (FORMAT))));
gst_structure_id_set (s,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (CURRENT), G_TYPE_INT64, cur, NULL);
}
/**
* gst_query_parse_position:
* @query: a #GstQuery
* @format: (out) (allow-none): the storage for the #GstFormat of the
* position values (may be NULL)
* @cur: (out) (allow-none): the storage for the current position (may be NULL)
*
* Parse a position query, writing the format into @format, and the position
* into @cur, if the respective parameters are non-NULL.
*/
void
gst_query_parse_position (GstQuery * query, GstFormat * format, gint64 * cur)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_POSITION);
structure = GST_QUERY_STRUCTURE (query);
if (format)
*format =
(GstFormat) g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (FORMAT)));
if (cur)
*cur = g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (CURRENT)));
}
/**
* gst_query_new_duration:
* @format: the #GstFormat for this duration query
*
* Constructs a new stream duration query object to query in the given format.
* Use gst_query_unref() when done with it. A duration query will give the
* total length of the stream.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*/
GstQuery *
gst_query_new_duration (GstFormat format)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (QUERY_DURATION),
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (DURATION), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
query = gst_query_new_custom (GST_QUERY_DURATION, structure);
return query;
}
/**
* gst_query_set_duration:
* @query: a #GstQuery
* @format: the #GstFormat for the duration
* @duration: the duration of the stream
*
* Answer a duration query by setting the requested value in the given format.
*/
void
gst_query_set_duration (GstQuery * query, GstFormat format, gint64 duration)
{
GstStructure *s;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_DURATION);
s = GST_QUERY_STRUCTURE (query);
g_return_if_fail (format == g_value_get_enum (gst_structure_id_get_value (s,
GST_QUARK (FORMAT))));
gst_structure_id_set (s, GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (DURATION), G_TYPE_INT64, duration, NULL);
}
/**
* gst_query_parse_duration:
* @query: a #GstQuery
* @format: (out) (allow-none): the storage for the #GstFormat of the duration
* value, or NULL.
* @duration: (out) (allow-none): the storage for the total duration, or NULL.
*
* Parse a duration query answer. Write the format of the duration into @format,
* and the value into @duration, if the respective variables are non-NULL.
*/
void
gst_query_parse_duration (GstQuery * query, GstFormat * format,
gint64 * duration)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_DURATION);
structure = GST_QUERY_STRUCTURE (query);
if (format)
*format =
(GstFormat) g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (FORMAT)));
if (duration)
*duration = g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (DURATION)));
}
/**
* gst_query_new_latency:
*
* Constructs a new latency query object.
* Use gst_query_unref() when done with it. A latency query is usually performed
* by sinks to compensate for additional latency introduced by elements in the
* pipeline.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a #GstQuery
*
* Since: 0.10.12
*/
GstQuery *
gst_query_new_latency (void)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (QUERY_LATENCY),
GST_QUARK (LIVE), G_TYPE_BOOLEAN, FALSE,
GST_QUARK (MIN_LATENCY), G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
GST_QUARK (MAX_LATENCY), G_TYPE_UINT64, G_GUINT64_CONSTANT (-1), NULL);
query = gst_query_new_custom (GST_QUERY_LATENCY, structure);
return query;
}
/**
* gst_query_set_latency:
* @query: a #GstQuery
* @live: if there is a live element upstream
* @min_latency: the minimal latency of the upstream elements
* @max_latency: the maximal latency of the upstream elements
*
* Answer a latency query by setting the requested values in the given format.
*
* Since: 0.10.12
*/
void
gst_query_set_latency (GstQuery * query, gboolean live,
GstClockTime min_latency, GstClockTime max_latency)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_LATENCY);
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (structure,
GST_QUARK (LIVE), G_TYPE_BOOLEAN, live,
GST_QUARK (MIN_LATENCY), G_TYPE_UINT64, min_latency,
GST_QUARK (MAX_LATENCY), G_TYPE_UINT64, max_latency, NULL);
}
/**
* gst_query_parse_latency:
* @query: a #GstQuery
* @live: (out) (allow-none): storage for live or NULL
* @min_latency: (out) (allow-none): the storage for the min latency or NULL
* @max_latency: (out) (allow-none): the storage for the max latency or NULL
*
* Parse a latency query answer.
*
* Since: 0.10.12
*/
void
gst_query_parse_latency (GstQuery * query, gboolean * live,
GstClockTime * min_latency, GstClockTime * max_latency)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_LATENCY);
structure = GST_QUERY_STRUCTURE (query);
if (live)
*live =
g_value_get_boolean (gst_structure_id_get_value (structure,
GST_QUARK (LIVE)));
if (min_latency)
*min_latency = g_value_get_uint64 (gst_structure_id_get_value (structure,
GST_QUARK (MIN_LATENCY)));
if (max_latency)
*max_latency = g_value_get_uint64 (gst_structure_id_get_value (structure,
GST_QUARK (MAX_LATENCY)));
}
/**
* gst_query_new_convert:
* @src_format: the source #GstFormat for the new query
* @value: the value to convert
* @dest_format: the target #GstFormat
*
* Constructs a new convert query object. Use gst_query_unref()
* when done with it. A convert query is used to ask for a conversion between
* one format and another.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a #GstQuery
*/
GstQuery *
gst_query_new_convert (GstFormat src_format, gint64 value,
GstFormat dest_format)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (QUERY_CONVERT),
GST_QUARK (SRC_FORMAT), GST_TYPE_FORMAT, src_format,
GST_QUARK (SRC_VALUE), G_TYPE_INT64, value,
GST_QUARK (DEST_FORMAT), GST_TYPE_FORMAT, dest_format,
GST_QUARK (DEST_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
query = gst_query_new_custom (GST_QUERY_CONVERT, structure);
return query;
}
/**
* gst_query_set_convert:
* @query: a #GstQuery
* @src_format: the source #GstFormat
* @src_value: the source value
* @dest_format: the destination #GstFormat
* @dest_value: the destination value
*
* Answer a convert query by setting the requested values.
*/
void
gst_query_set_convert (GstQuery * query, GstFormat src_format, gint64 src_value,
GstFormat dest_format, gint64 dest_value)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONVERT);
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (structure,
GST_QUARK (SRC_FORMAT), GST_TYPE_FORMAT, src_format,
GST_QUARK (SRC_VALUE), G_TYPE_INT64, src_value,
GST_QUARK (DEST_FORMAT), GST_TYPE_FORMAT, dest_format,
GST_QUARK (DEST_VALUE), G_TYPE_INT64, dest_value, NULL);
}
/**
* gst_query_parse_convert:
* @query: a #GstQuery
* @src_format: (out) (allow-none): the storage for the #GstFormat of the
* source value, or NULL
* @src_value: (out) (allow-none): the storage for the source value, or NULL
* @dest_format: (out) (allow-none): the storage for the #GstFormat of the
* destination value, or NULL
* @dest_value: (out) (allow-none): the storage for the destination value,
* or NULL
*
* Parse a convert query answer. Any of @src_format, @src_value, @dest_format,
* and @dest_value may be NULL, in which case that value is omitted.
*/
void
gst_query_parse_convert (GstQuery * query, GstFormat * src_format,
gint64 * src_value, GstFormat * dest_format, gint64 * dest_value)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONVERT);
structure = GST_QUERY_STRUCTURE (query);
if (src_format)
*src_format =
(GstFormat) g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (SRC_FORMAT)));
if (src_value)
*src_value = g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (SRC_VALUE)));
if (dest_format)
*dest_format =
(GstFormat) g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (DEST_FORMAT)));
if (dest_value)
*dest_value = g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (DEST_VALUE)));
}
/**
* gst_query_new_segment:
* @format: the #GstFormat for the new query
*
* Constructs a new segment query object. Use gst_query_unref()
* when done with it. A segment query is used to discover information about the
* currently configured segment for playback.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*/
GstQuery *
gst_query_new_segment (GstFormat format)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (QUERY_SEGMENT),
GST_QUARK (RATE), G_TYPE_DOUBLE, (gdouble) 0.0,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (START_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
GST_QUARK (STOP_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
query = gst_query_new_custom (GST_QUERY_SEGMENT, structure);
return query;
}
/**
* gst_query_set_segment:
* @query: a #GstQuery
* @rate: the rate of the segment
* @format: the #GstFormat of the segment values (@start_value and @stop_value)
* @start_value: the start value
* @stop_value: the stop value
*
* Answer a segment query by setting the requested values. The normal
* playback segment of a pipeline is 0 to duration at the default rate of
* 1.0. If a seek was performed on the pipeline to play a different
* segment, this query will return the range specified in the last seek.
*
* @start_value and @stop_value will respectively contain the configured
* playback range start and stop values expressed in @format.
* The values are always between 0 and the duration of the media and
* @start_value <= @stop_value. @rate will contain the playback rate. For
* negative rates, playback will actually happen from @stop_value to
* @start_value.
*/
void
gst_query_set_segment (GstQuery * query, gdouble rate, GstFormat format,
gint64 start_value, gint64 stop_value)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SEGMENT);
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (structure,
GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (START_VALUE), G_TYPE_INT64, start_value,
GST_QUARK (STOP_VALUE), G_TYPE_INT64, stop_value, NULL);
}
/**
* gst_query_parse_segment:
* @query: a #GstQuery
* @rate: (out) (allow-none): the storage for the rate of the segment, or NULL
* @format: (out) (allow-none): the storage for the #GstFormat of the values,
* or NULL
* @start_value: (out) (allow-none): the storage for the start value, or NULL
* @stop_value: (out) (allow-none): the storage for the stop value, or NULL
*
* Parse a segment query answer. Any of @rate, @format, @start_value, and
* @stop_value may be NULL, which will cause this value to be omitted.
*
* See gst_query_set_segment() for an explanation of the function arguments.
*/
void
gst_query_parse_segment (GstQuery * query, gdouble * rate, GstFormat * format,
gint64 * start_value, gint64 * stop_value)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SEGMENT);
structure = GST_QUERY_STRUCTURE (query);
if (rate)
*rate = g_value_get_double (gst_structure_id_get_value (structure,
GST_QUARK (RATE)));
if (format)
*format =
(GstFormat) g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (FORMAT)));
if (start_value)
*start_value = g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (START_VALUE)));
if (stop_value)
*stop_value = g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (STOP_VALUE)));
}
/**
* gst_query_new_custom:
* @type: the query type
* @structure: a structure for the query
*
* Constructs a new custom query object. Use gst_query_unref()
* when done with it.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*/
GstQuery *
gst_query_new_custom (GstQueryType type, GstStructure * structure)
{
GstQueryImpl *query;
query = g_slice_new0 (GstQueryImpl);
GST_DEBUG ("creating new query %p %s", query, gst_query_type_get_name (type));
if (structure) {
/* structure must not have a parent */
if (!gst_structure_set_parent_refcount (structure,
&query->query.mini_object.refcount))
goto had_parent;
}
gst_query_init (query, sizeof (GstQueryImpl), type);
GST_QUERY_STRUCTURE (query) = structure;
return GST_QUERY_CAST (query);
/* ERRORS */
had_parent:
{
g_slice_free1 (GST_MINI_OBJECT_SIZE (query), query);
g_warning ("structure is already owned by another object");
return NULL;
}
}
/**
* gst_query_get_structure:
* @query: a #GstQuery
*
* Get the structure of a query.
*
* Returns: (transfer none): the #GstStructure of the query. The structure is
* still owned by the query and will therefore be freed when the query
* is unreffed.
*/
const GstStructure *
gst_query_get_structure (GstQuery * query)
{
g_return_val_if_fail (GST_IS_QUERY (query), NULL);
return GST_QUERY_STRUCTURE (query);
}
/**
* gst_query_writable_structure:
* @query: a #GstQuery
*
* Get the structure of a query.
*
* Returns: (transfer none): the #GstStructure of the query. The structure is
* still owned by the query and will therefore be freed when the query
* is unreffed.
*/
GstStructure *
gst_query_writable_structure (GstQuery * query)
{
g_return_val_if_fail (GST_IS_QUERY (query), NULL);
g_return_val_if_fail (gst_query_is_writable (query), NULL);
return GST_QUERY_STRUCTURE (query);
}
/**
* gst_query_new_seeking:
* @format: the default #GstFormat for the new query
*
* Constructs a new query object for querying seeking properties of
* the stream.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*/
GstQuery *
gst_query_new_seeking (GstFormat format)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (QUERY_SEEKING),
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (SEEKABLE), G_TYPE_BOOLEAN, FALSE,
GST_QUARK (SEGMENT_START), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
GST_QUARK (SEGMENT_END), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
query = gst_query_new_custom (GST_QUERY_SEEKING, structure);
return query;
}
/**
* gst_query_set_seeking:
* @query: a #GstQuery
* @format: the format to set for the @segment_start and @segment_end values
* @seekable: the seekable flag to set
* @segment_start: the segment_start to set
* @segment_end: the segment_end to set
*
* Set the seeking query result fields in @query.
*/
void
gst_query_set_seeking (GstQuery * query, GstFormat format,
gboolean seekable, gint64 segment_start, gint64 segment_end)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SEEKING);
g_return_if_fail (gst_query_is_writable (query));
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (structure,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (SEEKABLE), G_TYPE_BOOLEAN, seekable,
GST_QUARK (SEGMENT_START), G_TYPE_INT64, segment_start,
GST_QUARK (SEGMENT_END), G_TYPE_INT64, segment_end, NULL);
}
/**
* gst_query_parse_seeking:
* @query: a GST_QUERY_SEEKING type query #GstQuery
* @format: (out) (allow-none): the format to set for the @segment_start
* and @segment_end values, or NULL
* @seekable: (out) (allow-none): the seekable flag to set, or NULL
* @segment_start: (out) (allow-none): the segment_start to set, or NULL
* @segment_end: (out) (allow-none): the segment_end to set, or NULL
*
* Parse a seeking query, writing the format into @format, and
* other results into the passed parameters, if the respective parameters
* are non-NULL
*/
void
gst_query_parse_seeking (GstQuery * query, GstFormat * format,
gboolean * seekable, gint64 * segment_start, gint64 * segment_end)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SEEKING);
structure = GST_QUERY_STRUCTURE (query);
if (format)
*format =
(GstFormat) g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (FORMAT)));
if (seekable)
*seekable = g_value_get_boolean (gst_structure_id_get_value (structure,
GST_QUARK (SEEKABLE)));
if (segment_start)
*segment_start = g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (SEGMENT_START)));
if (segment_end)
*segment_end = g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (SEGMENT_END)));
}
static GArray *
ensure_array (GstStructure * s, GQuark quark, gsize element_size,
GDestroyNotify clear_func)
{
GArray *array;
const GValue *value;
value = gst_structure_id_get_value (s, quark);
if (value) {
array = (GArray *) g_value_get_boxed (value);
} else {
GValue new_array_val = { 0, };
array = g_array_new (FALSE, TRUE, element_size);
if (clear_func)
g_array_set_clear_func (array, clear_func);
g_value_init (&new_array_val, G_TYPE_ARRAY);
g_value_take_boxed (&new_array_val, array);
gst_structure_id_take_value (s, quark, &new_array_val);
}
return array;
}
/**
* gst_query_new_formats:
*
* Constructs a new query object for querying formats of
* the stream.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*
* Since: 0.10.4
*/
GstQuery *
gst_query_new_formats (void)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id_empty (GST_QUARK (QUERY_FORMATS));
query = gst_query_new_custom (GST_QUERY_FORMATS, structure);
return query;
}
static void
gst_query_list_add_format (GValue * list, GstFormat format)
{
GValue item = { 0, };
g_value_init (&item, GST_TYPE_FORMAT);
g_value_set_enum (&item, format);
gst_value_list_append_value (list, &item);
g_value_unset (&item);
}
/**
* gst_query_set_formats:
* @query: a #GstQuery
* @n_formats: the number of formats to set.
* @...: A number of @GstFormats equal to @n_formats.
*
* Set the formats query result fields in @query. The number of formats passed
* must be equal to @n_formats.
*/
void
gst_query_set_formats (GstQuery * query, gint n_formats, ...)
{
va_list ap;
GValue list = { 0, };
gint i;
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_FORMATS);
g_return_if_fail (gst_query_is_writable (query));
g_value_init (&list, GST_TYPE_LIST);
va_start (ap, n_formats);
for (i = 0; i < n_formats; i++) {
gst_query_list_add_format (&list, va_arg (ap, GstFormat));
}
va_end (ap);
structure = GST_QUERY_STRUCTURE (query);
gst_structure_set_value (structure, "formats", &list);
g_value_unset (&list);
}
/**
* gst_query_set_formatsv:
* @query: a #GstQuery
* @n_formats: the number of formats to set.
* @formats: (in) (array length=n_formats): an array containing @n_formats
* @GstFormat values.
*
* Set the formats query result fields in @query. The number of formats passed
* in the @formats array must be equal to @n_formats.
*
* Since: 0.10.4
*/
void
gst_query_set_formatsv (GstQuery * query, gint n_formats,
const GstFormat * formats)
{
GValue list = { 0, };
gint i;
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_FORMATS);
g_return_if_fail (gst_query_is_writable (query));
g_value_init (&list, GST_TYPE_LIST);
for (i = 0; i < n_formats; i++) {
gst_query_list_add_format (&list, formats[i]);
}
structure = GST_QUERY_STRUCTURE (query);
gst_structure_set_value (structure, "formats", &list);
g_value_unset (&list);
}
/**
* gst_query_parse_n_formats:
* @query: a #GstQuery
* @n_formats: (out) (allow-none): the number of formats in this query.
*
* Parse the number of formats in the formats @query.
*
* Since: 0.10.4
*/
void
gst_query_parse_n_formats (GstQuery * query, guint * n_formats)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_FORMATS);
if (n_formats) {
const GValue *list;
structure = GST_QUERY_STRUCTURE (query);
list = gst_structure_get_value (structure, "formats");
if (list == NULL)
*n_formats = 0;
else
*n_formats = gst_value_list_get_size (list);
}
}
/**
* gst_query_parse_nth_format:
* @query: a #GstQuery
* @nth: (out): the nth format to retrieve.
* @format: (out) (allow-none): a pointer to store the nth format
*
* Parse the format query and retrieve the @nth format from it into
* @format. If the list contains less elements than @nth, @format will be
* set to GST_FORMAT_UNDEFINED.
*/
void
gst_query_parse_nth_format (GstQuery * query, guint nth, GstFormat * format)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_FORMATS);
if (format) {
const GValue *list;
structure = GST_QUERY_STRUCTURE (query);
list = gst_structure_get_value (structure, "formats");
if (list == NULL) {
*format = GST_FORMAT_UNDEFINED;
} else {
if (nth < gst_value_list_get_size (list)) {
*format =
(GstFormat) g_value_get_enum (gst_value_list_get_value (list, nth));
} else
*format = GST_FORMAT_UNDEFINED;
}
}
}
/**
* gst_query_new_buffering:
* @format: the default #GstFormat for the new query
*
* Constructs a new query object for querying the buffering status of
* a stream.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*
* Since: 0.10.20
*/
GstQuery *
gst_query_new_buffering (GstFormat format)
{
GstQuery *query;
GstStructure *structure;
/* by default, we configure the answer as no buffering with a 100% buffering
* progress */
structure = gst_structure_new_id (GST_QUARK (QUERY_BUFFERING),
GST_QUARK (BUSY), G_TYPE_BOOLEAN, FALSE,
GST_QUARK (BUFFER_PERCENT), G_TYPE_INT, 100,
GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, GST_BUFFERING_STREAM,
GST_QUARK (AVG_IN_RATE), G_TYPE_INT, -1,
GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, -1,
GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, G_GINT64_CONSTANT (0),
GST_QUARK (ESTIMATED_TOTAL), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (START_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
GST_QUARK (STOP_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
query = gst_query_new_custom (GST_QUERY_BUFFERING, structure);
return query;
}
/**
* gst_query_set_buffering_percent:
* @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
* @busy: if buffering is busy
* @percent: a buffering percent
*
* Set the percentage of buffered data. This is a value between 0 and 100.
* The @busy indicator is %TRUE when the buffering is in progress.
*
* Since: 0.10.20
*/
void
gst_query_set_buffering_percent (GstQuery * query, gboolean busy, gint percent)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
g_return_if_fail (gst_query_is_writable (query));
g_return_if_fail (percent >= 0 && percent <= 100);
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (structure,
GST_QUARK (BUSY), G_TYPE_BOOLEAN, busy,
GST_QUARK (BUFFER_PERCENT), G_TYPE_INT, percent, NULL);
}
/**
* gst_query_parse_buffering_percent:
* @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
* @busy: (out) (allow-none): if buffering is busy, or NULL
* @percent: (out) (allow-none): a buffering percent, or NULL
*
* Get the percentage of buffered data. This is a value between 0 and 100.
* The @busy indicator is %TRUE when the buffering is in progress.
*
* Since: 0.10.20
*/
void
gst_query_parse_buffering_percent (GstQuery * query, gboolean * busy,
gint * percent)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
structure = GST_QUERY_STRUCTURE (query);
if (busy)
*busy = g_value_get_boolean (gst_structure_id_get_value (structure,
GST_QUARK (BUSY)));
if (percent)
*percent = g_value_get_int (gst_structure_id_get_value (structure,
GST_QUARK (BUFFER_PERCENT)));
}
/**
* gst_query_set_buffering_stats:
* @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
* @mode: a buffering mode
* @avg_in: the average input rate
* @avg_out: the average output rate
* @buffering_left: amount of buffering time left
*
* Configures the buffering stats values in @query.
*
* Since: 0.10.20
*/
void
gst_query_set_buffering_stats (GstQuery * query, GstBufferingMode mode,
gint avg_in, gint avg_out, gint64 buffering_left)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
g_return_if_fail (gst_query_is_writable (query));
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (structure,
GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, mode,
GST_QUARK (AVG_IN_RATE), G_TYPE_INT, avg_in,
GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, avg_out,
GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, buffering_left, NULL);
}
/**
* gst_query_parse_buffering_stats:
* @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
* @mode: (out) (allow-none): a buffering mode, or NULL
* @avg_in: (out) (allow-none): the average input rate, or NULL
* @avg_out: (out) (allow-none): the average output rat, or NULLe
* @buffering_left: (out) (allow-none): amount of buffering time left, or NULL
*
* Extracts the buffering stats values from @query.
*
* Since: 0.10.20
*/
void
gst_query_parse_buffering_stats (GstQuery * query,
GstBufferingMode * mode, gint * avg_in, gint * avg_out,
gint64 * buffering_left)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
structure = GST_QUERY_STRUCTURE (query);
if (mode)
*mode = (GstBufferingMode)
g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (BUFFERING_MODE)));
if (avg_in)
*avg_in = g_value_get_int (gst_structure_id_get_value (structure,
GST_QUARK (AVG_IN_RATE)));
if (avg_out)
*avg_out = g_value_get_int (gst_structure_id_get_value (structure,
GST_QUARK (AVG_OUT_RATE)));
if (buffering_left)
*buffering_left =
g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (BUFFERING_LEFT)));
}
/**
* gst_query_set_buffering_range:
* @query: a #GstQuery
* @format: the format to set for the @start and @stop values
* @start: the start to set
* @stop: the stop to set
* @estimated_total: estimated total amount of download time
*
* Set the available query result fields in @query.
*
* Since: 0.10.20
*/
void
gst_query_set_buffering_range (GstQuery * query, GstFormat format,
gint64 start, gint64 stop, gint64 estimated_total)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
g_return_if_fail (gst_query_is_writable (query));
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (structure,
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
GST_QUARK (START_VALUE), G_TYPE_INT64, start,
GST_QUARK (STOP_VALUE), G_TYPE_INT64, stop,
GST_QUARK (ESTIMATED_TOTAL), G_TYPE_INT64, estimated_total, NULL);
}
/**
* gst_query_parse_buffering_range:
* @query: a GST_QUERY_BUFFERING type query #GstQuery
* @format: (out) (allow-none): the format to set for the @segment_start
* and @segment_end values, or NULL
* @start: (out) (allow-none): the start to set, or NULL
* @stop: (out) (allow-none): the stop to set, or NULL
* @estimated_total: (out) (allow-none): estimated total amount of download
* time, or NULL
*
* Parse an available query, writing the format into @format, and
* other results into the passed parameters, if the respective parameters
* are non-NULL
*
* Since: 0.10.20
*/
void
gst_query_parse_buffering_range (GstQuery * query, GstFormat * format,
gint64 * start, gint64 * stop, gint64 * estimated_total)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
structure = GST_QUERY_STRUCTURE (query);
if (format)
*format =
(GstFormat) g_value_get_enum (gst_structure_id_get_value (structure,
GST_QUARK (FORMAT)));
if (start)
*start = g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (START_VALUE)));
if (stop)
*stop = g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (STOP_VALUE)));
if (estimated_total)
*estimated_total =
g_value_get_int64 (gst_structure_id_get_value (structure,
GST_QUARK (ESTIMATED_TOTAL)));
}
/**
* gst_query_add_buffering_range:
* @query: a GST_QUERY_BUFFERING type query #GstQuery
* @start: start position of the range
* @stop: stop position of the range
*
* Set the buffering-ranges array field in @query. The current last
* start position of the array should be inferior to @start.
*
* Returns: a #gboolean indicating if the range was added or not.
*
* Since: 0.10.31
*/
gboolean
gst_query_add_buffering_range (GstQuery * query, gint64 start, gint64 stop)
{
GstQueryBufferingRange range;
GstStructure *structure;
GArray *array;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING, FALSE);
g_return_val_if_fail (gst_query_is_writable (query), FALSE);
if (G_UNLIKELY (start >= stop))
return FALSE;
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (BUFFERING_RANGES),
sizeof (GstQueryBufferingRange), NULL);
if (array->len > 1) {
GstQueryBufferingRange *last;
last = &g_array_index (array, GstQueryBufferingRange, array->len - 1);
if (G_UNLIKELY (start <= last->start))
return FALSE;
}
range.start = start;
range.stop = stop;
g_array_append_val (array, range);
return TRUE;
}
/**
* gst_query_get_n_buffering_ranges:
* @query: a GST_QUERY_BUFFERING type query #GstQuery
*
* Retrieve the number of values currently stored in the
* buffered-ranges array of the query's structure.
*
* Returns: the range array size as a #guint.
*
* Since: 0.10.31
*/
guint
gst_query_get_n_buffering_ranges (GstQuery * query)
{
GstStructure *structure;
GArray *array;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING, 0);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (BUFFERING_RANGES),
sizeof (GstQueryBufferingRange), NULL);
return array->len;
}
/**
* gst_query_parse_nth_buffering_range:
* @query: a GST_QUERY_BUFFERING type query #GstQuery
* @index: position in the buffered-ranges array to read
* @start: (out) (allow-none): the start position to set, or NULL
* @stop: (out) (allow-none): the stop position to set, or NULL
*
* Parse an available query and get the start and stop values stored
* at the @index of the buffered ranges array.
*
* Returns: a #gboolean indicating if the parsing succeeded.
*
* Since: 0.10.31
*/
gboolean
gst_query_parse_nth_buffering_range (GstQuery * query, guint index,
gint64 * start, gint64 * stop)
{
GstQueryBufferingRange *range;
GstStructure *structure;
GArray *array;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING, FALSE);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (BUFFERING_RANGES),
sizeof (GstQueryBufferingRange), NULL);
if (index >= array->len)
return FALSE;
range = &g_array_index (array, GstQueryBufferingRange, index);
if (start)
*start = range->start;
if (stop)
*stop = range->stop;
return TRUE;
}
/**
* gst_query_new_uri:
*
* Constructs a new query URI query object. Use gst_query_unref()
* when done with it. An URI query is used to query the current URI
* that is used by the source or sink.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*
* Since: 0.10.22
*/
GstQuery *
gst_query_new_uri (void)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (QUERY_URI),
GST_QUARK (URI), G_TYPE_STRING, NULL, NULL);
query = gst_query_new_custom (GST_QUERY_URI, structure);
return query;
}
/**
* gst_query_set_uri:
* @query: a #GstQuery with query type GST_QUERY_URI
* @uri: the URI to set
*
* Answer a URI query by setting the requested URI.
*
* Since: 0.10.22
*/
void
gst_query_set_uri (GstQuery * query, const gchar * uri)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_URI);
g_return_if_fail (gst_query_is_writable (query));
g_return_if_fail (gst_uri_is_valid (uri));
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (structure, GST_QUARK (URI), G_TYPE_STRING, uri, NULL);
}
/**
* gst_query_parse_uri:
* @query: a #GstQuery
* @uri: (out callee-allocates) (allow-none): the storage for the current URI
* (may be NULL)
*
* Parse an URI query, writing the URI into @uri as a newly
* allocated string, if the respective parameters are non-NULL.
* Free the string with g_free() after usage.
*
* Since: 0.10.22
*/
void
gst_query_parse_uri (GstQuery * query, gchar ** uri)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_URI);
structure = GST_QUERY_STRUCTURE (query);
if (uri)
*uri = g_value_dup_string (gst_structure_id_get_value (structure,
GST_QUARK (URI)));
}
/**
* gst_query_new_allocation:
* @caps: the negotiated caps
* @need_pool: return a pool
*
* Constructs a new query object for querying the allocation properties.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*/
GstQuery *
gst_query_new_allocation (GstCaps * caps, gboolean need_pool)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (QUERY_ALLOCATION),
GST_QUARK (CAPS), GST_TYPE_CAPS, caps,
GST_QUARK (NEED_POOL), G_TYPE_BOOLEAN, need_pool,
GST_QUARK (SIZE), G_TYPE_UINT, 0,
GST_QUARK (MIN_BUFFERS), G_TYPE_UINT, 0,
GST_QUARK (MAX_BUFFERS), G_TYPE_UINT, 0,
GST_QUARK (PREFIX), G_TYPE_UINT, 0,
GST_QUARK (ALIGN), G_TYPE_UINT, 0,
GST_QUARK (POOL), GST_TYPE_BUFFER_POOL, NULL, NULL);
query = gst_query_new_custom (GST_QUERY_ALLOCATION, structure);
return query;
}
/**
* gst_query_parse_allocation:
* @query: a #GstQuery
* @caps: (out callee-allocates) (allow-none): The #GstCaps
* @need_pool: (out) (allow-none): Whether a #GstBufferPool is needed
*
* Parse an allocation query, writing the requested caps in @caps and
* whether a pool is needed in @need_pool, if the respective parameters
* are non-NULL.
*/
void
gst_query_parse_allocation (GstQuery * query, GstCaps ** caps,
gboolean * need_pool)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_get (structure,
GST_QUARK (CAPS), GST_TYPE_CAPS, caps,
GST_QUARK (NEED_POOL), G_TYPE_BOOLEAN, need_pool, NULL);
}
/**
* gst_query_set_allocation_params:
* @query: A valid #GstQuery of type GST_QUERY_ALLOCATION.
* @size: the size
* @min_buffers: the min buffers
* @max_buffers: the max buffers
* @prefix: the prefix
* @alignment: the alignment
* @pool: the #GstBufferPool
*
* Set the allocation parameters in @query.
*/
void
gst_query_set_allocation_params (GstQuery * query, guint size,
guint min_buffers, guint max_buffers, guint prefix,
guint alignment, GstBufferPool * pool)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
g_return_if_fail (gst_query_is_writable (query));
g_return_if_fail (((alignment + 1) & alignment) == 0);
g_return_if_fail (size != 0 || pool == NULL);
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (structure,
GST_QUARK (SIZE), G_TYPE_UINT, size,
GST_QUARK (MIN_BUFFERS), G_TYPE_UINT, min_buffers,
GST_QUARK (MAX_BUFFERS), G_TYPE_UINT, max_buffers,
GST_QUARK (PREFIX), G_TYPE_UINT, prefix,
GST_QUARK (ALIGN), G_TYPE_UINT, alignment,
GST_QUARK (POOL), GST_TYPE_BUFFER_POOL, pool, NULL);
}
/**
* gst_query_parse_allocation_params:
* @query: A valid #GstQuery of type GST_QUERY_ALLOCATION.
* @size: (out) (allow-none): the size
* @min_buffers: (out) (allow-none): the min buffers
* @max_buffers: (out) (allow-none): the max buffers
* @prefix: (out) (allow-none): the prefix
* @alignment: (out) (allow-none): the alignment
* @pool: (out) (allow-none) (transfer full): the #GstBufferPool
*
* Get the allocation parameters in @query.
*/
void
gst_query_parse_allocation_params (GstQuery * query, guint * size,
guint * min_buffers, guint * max_buffers, guint * prefix,
guint * alignment, GstBufferPool ** pool)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_get (structure,
GST_QUARK (SIZE), G_TYPE_UINT, size,
GST_QUARK (MIN_BUFFERS), G_TYPE_UINT, min_buffers,
GST_QUARK (MAX_BUFFERS), G_TYPE_UINT, max_buffers,
GST_QUARK (PREFIX), G_TYPE_UINT, prefix,
GST_QUARK (ALIGN), G_TYPE_UINT, alignment,
GST_QUARK (POOL), GST_TYPE_BUFFER_POOL, pool, NULL);
}
/**
* gst_query_add_allocation_meta:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @api: the metadata API
*
* Add @api as aone of the supported metadata API to @query.
*/
void
gst_query_add_allocation_meta (GstQuery * query, GType api)
{
GArray *array;
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
g_return_if_fail (api != 0);
g_return_if_fail (gst_query_is_writable (query));
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (META), sizeof (GType), NULL);
g_array_append_val (array, api);
}
/**
* gst_query_get_n_allocation_metas:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
*
* Retrieve the number of values currently stored in the
* meta API array of the query's structure.
*
* Returns: the metadata API array size as a #guint.
*/
guint
gst_query_get_n_allocation_metas (GstQuery * query)
{
GArray *array;
GstStructure *structure;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION, 0);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (META), sizeof (GType), NULL);
return array->len;
}
/**
* gst_query_parse_nth_allocation_meta:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @index: position in the metadata API array to read
*
* Parse an available query and get the metadata API
* at @index of the metadata API array.
*
* Returns: a #GType of the metadata API at @index.
*/
GType
gst_query_parse_nth_allocation_meta (GstQuery * query, guint index)
{
GArray *array;
GType ret = 0;
GstStructure *structure;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION, 0);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (META), sizeof (GType), NULL);
if (index < array->len)
ret = g_array_index (array, GType, index);
return ret;
}
/**
* gst_query_has_allocation_meta:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @api: the metadata API
*
* Check if @query has metadata @api set.
*
* Returns: TRUE when @api is in the list of metadata.
*/
gboolean
gst_query_has_allocation_meta (GstQuery * query, GType api)
{
GArray *array;
GstStructure *structure;
guint i, len;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION, FALSE);
g_return_val_if_fail (api != 0, FALSE);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (META), sizeof (GType), NULL);
len = array->len;
for (i = 0; i < len; i++) {
if (g_array_index (array, GType, i) == api)
return TRUE;
}
return FALSE;
}
/**
* gst_query_add_allocation_memory:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @allocator: the memory allocator
*
* Add @allocator as a supported memory allocator.
*/
void
gst_query_add_allocation_memory (GstQuery * query, GstAllocator * allocator)
{
GArray *array;
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
g_return_if_fail (gst_query_is_writable (query));
g_return_if_fail (allocator != NULL);
structure = GST_QUERY_STRUCTURE (query);
array =
ensure_array (structure, GST_QUARK (ALLOCATOR), sizeof (GstAllocator *),
(GDestroyNotify) gst_allocator_unref);
g_array_append_val (array, allocator);
}
/**
* gst_query_get_n_allocation_memories:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
*
* Retrieve the number of values currently stored in the
* allocator array of the query's structure.
*
* If no memory allocator is specified, the downstream element can handle
* the default memory allocator.
*
* Returns: the allocator array size as a #guint.
*/
guint
gst_query_get_n_allocation_memories (GstQuery * query)
{
GArray *array;
GstStructure *structure;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION, 0);
structure = GST_QUERY_STRUCTURE (query);
array =
ensure_array (structure, GST_QUARK (ALLOCATOR), sizeof (GstAllocator *),
(GDestroyNotify) gst_allocator_unref);
return array->len;
}
/**
* gst_query_parse_nth_allocation_memory:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @index: position in the allocator array to read
*
* Parse an available query and get the alloctor
* at @index of the allocator array.
*
* Returns: (transfer none): the allocator at @index. The allocator remains
* valid for as long as @query is valid.
*/
GstAllocator *
gst_query_parse_nth_allocation_memory (GstQuery * query, guint index)
{
GArray *array;
GstAllocator *ret = NULL;
GstStructure *structure;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION, NULL);
structure = GST_QUERY_STRUCTURE (query);
array =
ensure_array (structure, GST_QUARK (ALLOCATOR), sizeof (GstAllocator *),
(GDestroyNotify) gst_allocator_unref);
if (index < array->len)
ret = g_array_index (array, GstAllocator *, index);
return ret;
}
/**
* gst_query_new_scheduling:
*
* Constructs a new query object for querying the scheduling properties.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*/
GstQuery *
gst_query_new_scheduling (void)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (QUERY_SCHEDULING),
GST_QUARK (FLAGS), GST_TYPE_SCHEDULING_FLAGS, 0,
GST_QUARK (MINSIZE), G_TYPE_INT, 1,
GST_QUARK (MAXSIZE), G_TYPE_INT, -1,
GST_QUARK (ALIGN), G_TYPE_INT, 0, NULL);
query = gst_query_new_custom (GST_QUERY_SCHEDULING, structure);
return query;
}
/**
* gst_query_set_scheduling:
* @query: A valid #GstQuery of type GST_QUERY_SCHEDULING.
* @flags: #GstSchedulingFlags
* @minsize: the suggested minimum size of pull requests
* @maxsize: the suggested maximum size of pull requests
* @align: the suggested alignment of pull requests
*
* Set the scheduling properties.
*/
void
gst_query_set_scheduling (GstQuery * query, GstSchedulingFlags flags,
gint minsize, gint maxsize, gint align)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SCHEDULING);
g_return_if_fail (gst_query_is_writable (query));
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (structure,
GST_QUARK (FLAGS), GST_TYPE_SCHEDULING_FLAGS, flags,
GST_QUARK (MINSIZE), G_TYPE_INT, minsize,
GST_QUARK (MAXSIZE), G_TYPE_INT, maxsize,
GST_QUARK (ALIGN), G_TYPE_INT, align, NULL);
}
/**
* gst_query_parse_scheduling:
* @query: A valid #GstQuery of type GST_QUERY_SCHEDULING.
* @flags: (out) (allow-none): #GstSchedulingFlags
* @minsize: (out) (allow-none): the suggested minimum size of pull requests
* @maxsize: (out) (allow-none): the suggested maximum size of pull requests:
* @align: (out) (allow-none): the suggested alignment of pull requests
*
* Set the scheduling properties.
*/
void
gst_query_parse_scheduling (GstQuery * query, GstSchedulingFlags * flags,
gint * minsize, gint * maxsize, gint * align)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SCHEDULING);
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_get (structure,
GST_QUARK (FLAGS), GST_TYPE_SCHEDULING_FLAGS, flags,
GST_QUARK (MINSIZE), G_TYPE_INT, minsize,
GST_QUARK (MAXSIZE), G_TYPE_INT, maxsize,
GST_QUARK (ALIGN), G_TYPE_INT, align, NULL);
}
/**
* gst_query_add_scheduling_mode:
* @query: a GST_QUERY_SCHEDULING type query #GstQuery
* @mode: a #GstPadMode
*
* Add @mode as aone of the supported scheduling modes to @query.
*/
void
gst_query_add_scheduling_mode (GstQuery * query, GstPadMode mode)
{
GstStructure *structure;
GArray *array;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SCHEDULING);
g_return_if_fail (gst_query_is_writable (query));
structure = GST_QUERY_STRUCTURE (query);
array =
ensure_array (structure, GST_QUARK (MODES), sizeof (GstPadMode), NULL);
g_array_append_val (array, mode);
}
/**
* gst_query_get_n_scheduling_modes:
* @query: a GST_QUERY_SCHEDULING type query #GstQuery
*
* Retrieve the number of values currently stored in the
* scheduling mode array of the query's structure.
*
* Returns: the scheduling mode array size as a #guint.
*/
guint
gst_query_get_n_scheduling_modes (GstQuery * query)
{
GArray *array;
GstStructure *structure;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SCHEDULING, 0);
structure = GST_QUERY_STRUCTURE (query);
array =
ensure_array (structure, GST_QUARK (MODES), sizeof (GstPadMode), NULL);
return array->len;
}
/**
* gst_query_parse_nth_scheduling_mode:
* @query: a GST_QUERY_SCHEDULING type query #GstQuery
* @index: position in the scheduling modes array to read
*
* Parse an available query and get the scheduling mode
* at @index of the scheduling modes array.
*
* Returns: a #GstPadMode of the scheduling mode at @index.
*/
GstPadMode
gst_query_parse_nth_scheduling_mode (GstQuery * query, guint index)
{
GstPadMode ret = GST_PAD_MODE_NONE;
GstStructure *structure;
GArray *array;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SCHEDULING, ret);
structure = GST_QUERY_STRUCTURE (query);
array =
ensure_array (structure, GST_QUARK (MODES), sizeof (GstPadMode), NULL);
if (index < array->len)
ret = g_array_index (array, GstPadMode, index);
return ret;
}
/**
* gst_query_has_scheduling_mode:
* @query: a GST_QUERY_SCHEDULING type query #GstQuery
* @mode: the scheduling mode
*
* Check if @query has scheduling mode set.
*
* Returns: TRUE when @mode is in the list of scheduling modes.
*/
gboolean
gst_query_has_scheduling_mode (GstQuery * query, GstPadMode mode)
{
GstStructure *structure;
GArray *array;
guint i, len;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SCHEDULING, FALSE);
structure = GST_QUERY_STRUCTURE (query);
array =
ensure_array (structure, GST_QUARK (MODES), sizeof (GstPadMode), NULL);
len = array->len;
for (i = 0; i < len; i++) {
if (mode == g_array_index (array, GstPadMode, i))
return TRUE;
}
return FALSE;
}
/**
* gst_query_new_accept_caps:
* @caps: a #GstCaps
*
* Constructs a new query object for querying if @caps are accepted.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*/
GstQuery *
gst_query_new_accept_caps (GstCaps * caps)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (QUERY_ACCEPT_CAPS),
GST_QUARK (CAPS), GST_TYPE_CAPS, caps,
GST_QUARK (RESULT), G_TYPE_BOOLEAN, FALSE, NULL);
query = gst_query_new_custom (GST_QUERY_ACCEPT_CAPS, structure);
return query;
}
/**
* gst_query_parse_accept_caps:
* @query: The query to parse
* @caps: (out): A pointer to the caps
*
* Get the caps from @query. The caps remains valid as long as @query remains
* valid.
*/
void
gst_query_parse_accept_caps (GstQuery * query, GstCaps ** caps)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ACCEPT_CAPS);
g_return_if_fail (caps != NULL);
structure = GST_QUERY_STRUCTURE (query);
*caps = g_value_get_boxed (gst_structure_id_get_value (structure,
GST_QUARK (CAPS)));
}
void
gst_query_set_accept_caps_result (GstQuery * query, gboolean result)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ACCEPT_CAPS);
g_return_if_fail (gst_query_is_writable (query));
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (structure,
GST_QUARK (RESULT), G_TYPE_BOOLEAN, result, NULL);
}
void
gst_query_parse_accept_caps_result (GstQuery * query, gboolean * result)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ACCEPT_CAPS);
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_get (structure,
GST_QUARK (RESULT), G_TYPE_BOOLEAN, result, NULL);
}
/**
* gst_query_new_caps:
* @filter: a filter
*
* Constructs a new query object for querying the caps.
*
* The CAPS query should return the* allowable caps for a pad in the context
* of the element's state, its link to other elements, and the devices or files
* it has opened. These caps must be a subset of the pad template caps. In the
* NULL state with no links, the CAPS query should ideally return the same caps
* as the pad template. In rare circumstances, an object property can affect
* the caps returned by the CAPS query, but this is discouraged.
*
* For most filters, the caps returned by CAPS query is directly affected by the
* allowed caps on other pads. For demuxers and decoders, the caps returned by
* the srcpad's getcaps function is directly related to the stream data. Again,
* the CAPS query should return the most specific caps it reasonably can, since this
* helps with autoplugging.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*/
GstQuery *
gst_query_new_caps (GstCaps * filter)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id (GST_QUARK (QUERY_CAPS),
GST_QUARK (FILTER), GST_TYPE_CAPS, filter,
GST_QUARK (CAPS), GST_TYPE_CAPS, NULL, NULL);
query = gst_query_new_custom (GST_QUERY_CAPS, structure);
return query;
}
/**
* gst_query_parse_caps:
* @query: The query to parse
* @filter: (out): A pointer to the caps filter
*
* Get the filter from the caps @query. The caps remains valid as long as
* @query remains valid.
*/
void
gst_query_parse_caps (GstQuery * query, GstCaps ** filter)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CAPS);
g_return_if_fail (filter != NULL);
structure = GST_QUERY_STRUCTURE (query);
*filter = g_value_get_boxed (gst_structure_id_get_value (structure,
GST_QUARK (FILTER)));
}
/**
* gst_query_set_caps_result:
* @query: The query to use
* @caps: (in): A pointer to the caps
*
* Set the @caps result in @query.
*/
void
gst_query_set_caps_result (GstQuery * query, GstCaps * caps)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CAPS);
g_return_if_fail (gst_query_is_writable (query));
structure = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (structure, GST_QUARK (CAPS), GST_TYPE_CAPS, caps, NULL);
}
/**
* gst_query_parse_caps_result:
* @query: The query to parse
* @caps: (out): A pointer to the caps
*
* Get the caps result from @query. The caps remains valid as long as
* @query remains valid.
*/
void
gst_query_parse_caps_result (GstQuery * query, GstCaps ** caps)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CAPS);
g_return_if_fail (caps != NULL);
structure = GST_QUERY_STRUCTURE (query);
*caps = g_value_get_boxed (gst_structure_id_get_value (structure,
GST_QUARK (CAPS)));
}
void
gst_query_intersect_caps_result (GstQuery * query, GstCaps * filter,
GstCapsIntersectMode mode)
{
GstCaps *res, *caps = NULL;
gst_query_parse_caps_result (query, &caps);
res = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
gst_query_set_caps_result (query, res);
gst_caps_unref (res);
}
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