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gstreamer/gst/gstquery.c
Sebastian Dröge 356ef049d3 query: Add gst_query_has_context_type()
2013-07-16 15:16:16 +02:00

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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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstquery
* @short_description: Provide functions to create queries, and to set and parse
* values in them.
* @see_also: #GstPad, #GstElement
*
* 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 2012-03-29 (0.11.3)
*/
#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)
typedef struct
{
const gint type;
const gchar *name;
GQuark quark;
} GstQueryQuarks;
static GstQueryQuarks query_quarks[] = {
{GST_QUERY_UNKNOWN, "unknown", 0},
{GST_QUERY_POSITION, "position", 0},
{GST_QUERY_DURATION, "duration", 0},
{GST_QUERY_LATENCY, "latency", 0},
{GST_QUERY_JITTER, "jitter", 0},
{GST_QUERY_RATE, "rate", 0},
{GST_QUERY_SEEKING, "seeking", 0},
{GST_QUERY_SEGMENT, "segment", 0},
{GST_QUERY_CONVERT, "convert", 0},
{GST_QUERY_FORMATS, "formats", 0},
{GST_QUERY_BUFFERING, "buffering", 0},
{GST_QUERY_CUSTOM, "custom", 0},
{GST_QUERY_URI, "uri", 0},
{GST_QUERY_ALLOCATION, "allocation", 0},
{GST_QUERY_SCHEDULING, "scheduling", 0},
{GST_QUERY_ACCEPT_CAPS, "accept-caps", 0},
{GST_QUERY_CAPS, "caps", 0},
{GST_QUERY_DRAIN, "drain", 0},
{GST_QUERY_CONTEXT, "context", 0},
{0, NULL, 0}
};
GST_DEFINE_MINI_OBJECT_TYPE (GstQuery, gst_query);
void
_priv_gst_query_initialize (void)
{
gint i;
_gst_query_type = gst_query_get_type ();
GST_DEBUG_CATEGORY_INIT (gst_query_debug, "query", 0, "query system");
for (i = 0; query_quarks[i].name; i++) {
query_quarks[i].quark = g_quark_from_static_string (query_quarks[i].name);
}
}
/**
* gst_query_type_get_name:
* @type: 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 type)
{
gint i;
for (i = 0; query_quarks[i].name; i++) {
if (type == query_quarks[i].type)
return query_quarks[i].name;
}
return "unknown";
}
/**
* gst_query_type_to_quark:
* @type: 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 type)
{
gint i;
for (i = 0; query_quarks[i].name; i++) {
if (type == query_quarks[i].type)
return query_quarks[i].quark;
}
return 0;
}
/**
* gst_query_type_get_flags:
* @type: a #GstQueryType
*
* Gets the #GstQueryTypeFlags associated with @type.
*
* Returns: a #GstQueryTypeFlags.
*/
GstQueryTypeFlags
gst_query_type_get_flags (GstQueryType type)
{
GstQueryTypeFlags ret;
ret = type & ((1 << GST_QUERY_NUM_SHIFT) - 1);
return ret;
}
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 (sizeof (GstQueryImpl), query);
}
static GstQuery *
_gst_query_copy (GstQuery * query)
{
GstQuery *copy;
GstStructure *s;
s = GST_QUERY_STRUCTURE (query);
if (s) {
s = gst_structure_copy (s);
}
copy = gst_query_new_custom (query->type, s);
return copy;
}
/**
* 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
*/
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.
*/
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.
*/
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_mini_object_init (GST_MINI_OBJECT_CAST (query), 0, _gst_query_type,
(GstMiniObjectCopyFunction) _gst_query_copy, NULL,
(GstMiniObjectFreeFunction) _gst_query_free);
GST_QUERY_TYPE (query) = type;
GST_QUERY_STRUCTURE (query) = structure;
return GST_QUERY_CAST (query);
/* ERRORS */
had_parent:
{
g_slice_free1 (sizeof (GstQueryImpl), 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. This method should be called with a writable
* @query so that the returned structure is guranteed to be writable.
*
* 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
*/
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.
*/
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.
*/
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
*/
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.
*/
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.
*/
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 in milliseconds
*
* Configures the buffering stats values in @query.
*/
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 in
* milliseconds, or NULL
*
* Extracts the buffering stats values from @query.
*/
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.
*/
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
*/
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)));
}
/* GstQueryBufferingRange: internal struct for GArray */
typedef struct
{
gint64 start;
gint64 stop;
} GstQueryBufferingRange;
/**
* 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.
*/
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.
*/
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.
*/
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);
g_return_val_if_fail (index < array->len, 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
*/
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.
*/
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.
*/
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, NULL);
query = gst_query_new_custom (GST_QUERY_ALLOCATION, structure);
return query;
}
/**
* gst_query_parse_allocation:
* @query: a #GstQuery
* @caps: (out) (transfer none) (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);
if (caps) {
*caps = g_value_get_boxed (gst_structure_id_get_value (structure,
GST_QUARK (CAPS)));
}
gst_structure_id_get (structure,
GST_QUARK (NEED_POOL), G_TYPE_BOOLEAN, need_pool, NULL);
}
typedef struct
{
GstBufferPool *pool;
guint size;
guint min_buffers;
guint max_buffers;
} AllocationPool;
static void
allocation_pool_free (AllocationPool * ap)
{
if (ap->pool)
gst_object_unref (ap->pool);
}
/**
* gst_query_add_allocation_pool:
* @query: A valid #GstQuery of type GST_QUERY_ALLOCATION.
* @pool: the #GstBufferPool
* @size: the size
* @min_buffers: the min buffers
* @max_buffers: the max buffers
*
* Set the pool parameters in @query.
*/
void
gst_query_add_allocation_pool (GstQuery * query, GstBufferPool * pool,
guint size, guint min_buffers, guint max_buffers)
{
GArray *array;
GstStructure *structure;
AllocationPool ap;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
g_return_if_fail (gst_query_is_writable (query));
g_return_if_fail (size != 0);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (POOL),
sizeof (AllocationPool), (GDestroyNotify) allocation_pool_free);
if ((ap.pool = pool))
gst_object_ref (pool);
ap.size = size;
ap.min_buffers = min_buffers;
ap.max_buffers = max_buffers;
g_array_append_val (array, ap);
}
/**
* gst_query_get_n_allocation_pools:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
*
* Retrieve the number of values currently stored in the
* pool array of the query's structure.
*
* Returns: the pool array size as a #guint.
*/
guint
gst_query_get_n_allocation_pools (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 (POOL),
sizeof (AllocationPool), (GDestroyNotify) allocation_pool_free);
return array->len;
}
/**
* gst_query_parse_nth_allocation_pool:
* @query: A valid #GstQuery of type GST_QUERY_ALLOCATION.
* @index: index to parse
* @pool: (out) (allow-none) (transfer full): the #GstBufferPool
* @size: (out) (allow-none): the size
* @min_buffers: (out) (allow-none): the min buffers
* @max_buffers: (out) (allow-none): the max buffers
*
* Get the pool parameters in @query.
*
* Unref @pool with gst_object_unref() when it's not needed any more.
*/
void
gst_query_parse_nth_allocation_pool (GstQuery * query, guint index,
GstBufferPool ** pool, guint * size, guint * min_buffers,
guint * max_buffers)
{
GArray *array;
GstStructure *structure;
AllocationPool *ap;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (POOL),
sizeof (AllocationPool), (GDestroyNotify) allocation_pool_free);
g_return_if_fail (index < array->len);
ap = &g_array_index (array, AllocationPool, index);
if (pool)
if ((*pool = ap->pool))
gst_object_ref (*pool);
if (size)
*size = ap->size;
if (min_buffers)
*min_buffers = ap->min_buffers;
if (max_buffers)
*max_buffers = ap->max_buffers;
}
/**
* gst_query_set_nth_allocation_pool:
* @index: index to modify
* @query: A valid #GstQuery of type GST_QUERY_ALLOCATION.
* @pool: the #GstBufferPool
* @size: the size
* @min_buffers: the min buffers
* @max_buffers: the max buffers
*
* Set the pool parameters in @query.
*/
void
gst_query_set_nth_allocation_pool (GstQuery * query, guint index,
GstBufferPool * pool, guint size, guint min_buffers, guint max_buffers)
{
GArray *array;
GstStructure *structure;
AllocationPool *oldap, ap;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (POOL),
sizeof (AllocationPool), (GDestroyNotify) allocation_pool_free);
g_return_if_fail (index < array->len);
oldap = &g_array_index (array, AllocationPool, index);
allocation_pool_free (oldap);
if ((ap.pool = pool))
gst_object_ref (pool);
ap.size = size;
ap.min_buffers = min_buffers;
ap.max_buffers = max_buffers;
g_array_index (array, AllocationPool, index) = ap;
}
/**
* gst_query_remove_nth_allocation_pool:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @index: position in the allocation pool array to remove
*
* Remove the allocation pool at @index of the allocation pool array.
*/
void
gst_query_remove_nth_allocation_pool (GstQuery * query, guint index)
{
GArray *array;
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
g_return_if_fail (gst_query_is_writable (query));
structure = GST_QUERY_STRUCTURE (query);
array =
ensure_array (structure, GST_QUARK (POOL), sizeof (AllocationPool),
(GDestroyNotify) allocation_pool_free);
g_return_if_fail (index < array->len);
g_array_remove_index (array, index);
}
typedef struct
{
GType api;
GstStructure *params;
} AllocationMeta;
static void
allocation_meta_free (AllocationMeta * am)
{
if (am->params)
gst_structure_free (am->params);
}
/**
* gst_query_add_allocation_meta:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @api: the metadata API
* @params: (transfer none) (allow-none): API specific parameters
*
* Add @api with @params as one of the supported metadata API to @query.
*/
void
gst_query_add_allocation_meta (GstQuery * query, GType api,
const GstStructure * params)
{
GArray *array;
GstStructure *structure;
AllocationMeta am;
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 (AllocationMeta),
(GDestroyNotify) allocation_meta_free);
am.api = api;
am.params = (params ? gst_structure_copy (params) : NULL);
g_array_append_val (array, am);
}
/**
* 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 (AllocationMeta),
(GDestroyNotify) allocation_meta_free);
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
* @params: (out) (allow-none): API specific flags
*
* 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,
const GstStructure ** params)
{
GArray *array;
GstStructure *structure;
AllocationMeta *am;
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 (AllocationMeta),
(GDestroyNotify) allocation_meta_free);
g_return_val_if_fail (index < array->len, 0);
am = &g_array_index (array, AllocationMeta, index);
if (params)
*params = am->params;
return am->api;
}
/**
* gst_query_remove_nth_allocation_meta:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @index: position in the metadata API array to remove
*
* Remove the metadata API at @index of the metadata API array.
*/
void
gst_query_remove_nth_allocation_meta (GstQuery * query, guint index)
{
GArray *array;
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
g_return_if_fail (gst_query_is_writable (query));
structure = GST_QUERY_STRUCTURE (query);
array =
ensure_array (structure, GST_QUARK (META), sizeof (AllocationMeta),
(GDestroyNotify) allocation_meta_free);
g_return_if_fail (index < array->len);
g_array_remove_index (array, index);
}
/**
* gst_query_find_allocation_meta:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @api: the metadata API
* @index: (out) (allow-none): the index
*
* Check if @query has metadata @api set. When this function returns TRUE,
* @index will contain the index where the requested API and the flags can be
* found.
*
* Returns: TRUE when @api is in the list of metadata.
*/
gboolean
gst_query_find_allocation_meta (GstQuery * query, GType api, guint * index)
{
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 (AllocationMeta),
(GDestroyNotify) allocation_meta_free);
len = array->len;
for (i = 0; i < len; i++) {
AllocationMeta *am = &g_array_index (array, AllocationMeta, i);
if (am->api == api) {
if (index)
*index = i;
return TRUE;
}
}
return FALSE;
}
typedef struct
{
GstAllocator *allocator;
GstAllocationParams params;
} AllocationParam;
static void
allocation_param_free (AllocationParam * ap)
{
if (ap->allocator)
gst_object_unref (ap->allocator);
}
/**
* gst_query_add_allocation_param:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @allocator: (transfer none) (allow-none): the memory allocator
* @params: (transfer none) (allow-none): a #GstAllocationParams
*
* Add @allocator and its @params as a supported memory allocator.
*/
void
gst_query_add_allocation_param (GstQuery * query, GstAllocator * allocator,
const GstAllocationParams * params)
{
GArray *array;
GstStructure *structure;
AllocationParam ap;
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 || params != NULL);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (ALLOCATOR),
sizeof (AllocationParam), (GDestroyNotify) allocation_param_free);
if ((ap.allocator = allocator))
gst_object_ref (allocator);
if (params)
ap.params = *params;
else
gst_allocation_params_init (&ap.params);
g_array_append_val (array, ap);
}
/**
* gst_query_get_n_allocation_params:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
*
* Retrieve the number of values currently stored in the
* allocator params array of the query's structure.
*
* If no memory allocator is specified, the downstream element can handle
* the default memory allocator. The first memory allocator in the query
* should be generic and allow mapping to system memory, all following
* allocators should be ordered by preference with the preferred one first.
*
* Returns: the allocator array size as a #guint.
*/
guint
gst_query_get_n_allocation_params (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 (AllocationParam), (GDestroyNotify) allocation_param_free);
return array->len;
}
/**
* gst_query_parse_nth_allocation_param:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @index: position in the allocator array to read
* @allocator: (out) (transfer full) (allow-none): variable to hold the result
* @params: (out) (allow-none): parameters for the allocator
*
* Parse an available query and get the alloctor and its params
* at @index of the allocator array.
*/
void
gst_query_parse_nth_allocation_param (GstQuery * query, guint index,
GstAllocator ** allocator, GstAllocationParams * params)
{
GArray *array;
GstStructure *structure;
AllocationParam *ap;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (ALLOCATOR),
sizeof (AllocationParam), (GDestroyNotify) allocation_param_free);
g_return_if_fail (index < array->len);
ap = &g_array_index (array, AllocationParam, index);
if (allocator)
if ((*allocator = ap->allocator))
gst_object_ref (*allocator);
if (params)
*params = ap->params;
}
/**
* gst_query_set_nth_allocation_param:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @index: position in the allocator array to set
* @allocator: (transfer none) (allow-none): new allocator to set
* @params: (transfer none) (allow-none): parameters for the allocator
*
* Parse an available query and get the alloctor and its params
* at @index of the allocator array.
*/
void
gst_query_set_nth_allocation_param (GstQuery * query, guint index,
GstAllocator * allocator, const GstAllocationParams * params)
{
GArray *array;
GstStructure *structure;
AllocationParam *old, ap;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (ALLOCATOR),
sizeof (AllocationParam), (GDestroyNotify) allocation_param_free);
g_return_if_fail (index < array->len);
old = &g_array_index (array, AllocationParam, index);
allocation_param_free (old);
if ((ap.allocator = allocator))
gst_object_ref (allocator);
if (params)
ap.params = *params;
else
gst_allocation_params_init (&ap.params);
g_array_index (array, AllocationParam, index) = ap;
}
/**
* gst_query_remove_nth_allocation_param:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @index: position in the allocation param array to remove
*
* Remove the allocation param at @index of the allocation param array.
*/
void
gst_query_remove_nth_allocation_param (GstQuery * query, guint index)
{
GArray *array;
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_ALLOCATION);
g_return_if_fail (gst_query_is_writable (query));
structure = GST_QUERY_STRUCTURE (query);
array =
ensure_array (structure, GST_QUARK (ALLOCATOR), sizeof (AllocationParam),
(GDestroyNotify) allocation_param_free);
g_return_if_fail (index < array->len);
g_array_remove_index (array, index);
}
/**
* 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)
{
GstStructure *structure;
GArray *array;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SCHEDULING,
GST_PAD_MODE_NONE);
structure = GST_QUERY_STRUCTURE (query);
array =
ensure_array (structure, GST_QUARK (MODES), sizeof (GstPadMode), NULL);
g_return_val_if_fail (index < array->len, GST_PAD_MODE_NONE);
return g_array_index (array, GstPadMode, index);
}
/**
* gst_query_has_scheduling_mode:
* @query: a GST_QUERY_SCHEDULING type query #GstQuery
* @mode: the scheduling mode
*
* Check if @query has scheduling mode set.
*
* <note>
* <para>
* When checking if upstream supports pull mode, it is usually not
* enough to just check for GST_PAD_MODE_PULL with this function, you
* also want to check whether the scheduling flags returned by
* gst_query_parse_scheduling() have the seeking flag set (meaning
* random access is supported, not only sequential pulls).
* </para>
* </note>
*
* 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_has_scheduling_mode_with_flags:
* @query: a GST_QUERY_SCHEDULING type query #GstQuery
* @mode: the scheduling mode
* @flags: #GstSchedulingFlags
*
* Check if @query has scheduling mode set and @flags is set in
* query scheduling flags.
*
* Returns: TRUE when @mode is in the list of scheduling modes
* and @flags are compatible with query flags.
*/
gboolean
gst_query_has_scheduling_mode_with_flags (GstQuery * query, GstPadMode mode,
GstSchedulingFlags flags)
{
GstSchedulingFlags sched_flags;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SCHEDULING, FALSE);
gst_query_parse_scheduling (query, &sched_flags, NULL, NULL, NULL);
return ((flags & sched_flags) == flags) &&
gst_query_has_scheduling_mode (query, mode);
}
/**
* gst_query_new_accept_caps:
* @caps: a fixed #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;
g_return_val_if_fail (gst_caps_is_fixed (caps), NULL);
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)));
}
/**
* gst_query_set_accept_caps_result:
* @query: a GST_QUERY_ACCEPT_CAPS type query #GstQuery
* @result: the result to set
*
* Set @result as the result for the @query.
*/
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);
}
/**
* gst_query_parse_accept_caps_result:
* @query: a GST_QUERY_ACCEPT_CAPS type query #GstQuery
* @result: location for the result
*
* Parse the result from @query and store in @result.
*/
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.
*
* The @filter is used to restrict the result caps, only the caps matching
* @filter should be returned from the CAPS query. Specifying a filter might
* greatly reduce the amount of processing an element needs to do.
*
* 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)));
}
#if 0
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);
}
#endif
/**
* gst_query_new_drain:
*
* Constructs a new query object for querying the drain state.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*/
GstQuery *
gst_query_new_drain (void)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id_empty (GST_QUARK (QUERY_DRAIN));
query = gst_query_new_custom (GST_QUERY_DRAIN, structure);
return query;
}
/**
* gst_query_new_context:
*
* Constructs a new query object for querying the pipeline-local context.
*
* Free-function: gst_query_unref
*
* Returns: (transfer full): a new #GstQuery
*/
GstQuery *
gst_query_new_context (void)
{
GstQuery *query;
GstStructure *structure;
structure = gst_structure_new_id_empty (GST_QUARK (QUERY_CONTEXT));
query = gst_query_new_custom (GST_QUERY_CONTEXT, structure);
return query;
}
/**
* gst_query_set_context:
* @query: a #GstQuery with query type GST_QUERY_CONTEXT
* @context: the requested #GstContext
*
* Answer a context query by setting the requested context.
*/
void
gst_query_set_context (GstQuery * query, GstContext * context)
{
GstStructure *s;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONTEXT);
s = GST_QUERY_STRUCTURE (query);
gst_structure_id_set (s,
GST_QUARK (CONTEXT), GST_TYPE_CONTEXT, context, NULL);
}
/**
* gst_query_parse_context:
* @query: The query to parse
* @context: (out): A pointer to store the #GstContext
*
* Get the context from the context @query. The context remains valid as long as
* @query remains valid.
*/
void
gst_query_parse_context (GstQuery * query, GstContext ** context)
{
GstStructure *structure;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONTEXT);
g_return_if_fail (context != NULL);
structure = GST_QUERY_STRUCTURE (query);
*context = g_value_get_boxed (gst_structure_id_get_value (structure,
GST_QUARK (CONTEXT)));
}
static void
free_array_string (gpointer ptr)
{
gchar *str = *(gchar **) ptr;
g_free (str);
}
/**
* gst_query_add_context_type:
* @query: a GST_QUERY_CONTEXT type query
* @context_type: a context type
*
* Add a new context type to @query.
*/
void
gst_query_add_context_type (GstQuery * query, const gchar * context_type)
{
GstStructure *structure;
GArray *array;
gchar *copy;
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONTEXT);
g_return_if_fail (gst_query_is_writable (query));
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (CONTEXT_TYPES),
sizeof (gchar *), free_array_string);
copy = g_strdup (context_type);
g_array_append_val (array, copy);
}
/**
* gst_query_get_n_context_types:
* @query: a GST_QUERY_CONTEXT type query
*
* Retrieve the number of values currently stored in the
* context-types array of the query's structure.
*
* Returns: the context-types array size as a #guint.
*/
guint
gst_query_get_n_context_types (GstQuery * query)
{
GstStructure *structure;
GArray *array;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONTEXT, 0);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (CONTEXT_TYPES),
sizeof (gchar *), free_array_string);
return array->len;
}
/**
* gst_query_parse_nth_context_type:
* @query: a GST_QUERY_CONTEXT type query
* @context_type: (out) (allow-none): the context type, or NULL
*
* Parse a context type from an existing GST_QUERY_CONTEXT query
* from @index.
*
* Returns: a #gboolean indicating if the parsing succeeded.
*/
gboolean
gst_query_parse_nth_context_type (GstQuery * query, guint index,
const gchar ** context_type)
{
GstStructure *structure;
GArray *array;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONTEXT, FALSE);
structure = GST_QUERY_STRUCTURE (query);
array = ensure_array (structure, GST_QUARK (CONTEXT_TYPES),
sizeof (gchar *), free_array_string);
g_return_val_if_fail (index < array->len, FALSE);
if (context_type)
*context_type = g_array_index (array, gchar *, index);
return TRUE;
}
/**
* gst_query_has_context_type:
* @query: a GST_QUERY_CONTEXT type query
* @context_type: the context type
*
* Check if @query is asking for @context_type.
*
* Returns: %TRUE if @context_type is requested.
*/
gboolean
gst_query_has_context_type (GstQuery * query, const gchar * context_type)
{
guint i, n;
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONTEXT, FALSE);
g_return_val_if_fail (context_type != NULL, FALSE);
n = gst_query_get_n_context_types (query);
for (i = 0; i < n; i++) {
const gchar *tmp;
if (gst_query_parse_nth_context_type (query, i, &tmp) &&
strcmp (tmp, context_type) == 0)
return TRUE;
}
return FALSE;
}
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