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7f6b11a5b2
This allow proposing a number of buffers required even if the size of buffer is unfixed. This is often the case for encoded formats.
2643 lines
74 KiB
C
2643 lines
74 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wim.taymans@chello.be>
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* 2005 Wim Taymans <wim@fluendo.com>
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*
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* gstquery.c: GstQueryType registration and Query parsing/creation
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:gstquery
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* @short_description: Provide functions to create queries, and to set and parse
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* values in them.
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* @see_also: #GstPad, #GstElement
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*
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* Queries can be performed on pads (gst_pad_query()) and elements
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* (gst_element_query()). Please note that some queries might need a running
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* pipeline to work.
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*
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* Queries can be created using the gst_query_new_*() functions.
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* Query values can be set using gst_query_set_*(), and parsed using
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* gst_query_parse_*() helpers.
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*
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* The following example shows how to query the duration of a pipeline:
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* |[
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* GstQuery *query;
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* gboolean res;
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* query = gst_query_new_duration (GST_FORMAT_TIME);
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* res = gst_element_query (pipeline, query);
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* if (res) {
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* gint64 duration;
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* gst_query_parse_duration (query, NULL, &duration);
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* g_print ("duration = %"GST_TIME_FORMAT, GST_TIME_ARGS (duration));
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* } else {
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* g_print ("duration query failed...");
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* }
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* gst_query_unref (query);
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* ]|
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*/
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#include "gst_private.h"
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#include "gstinfo.h"
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#include "gstquery.h"
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#include "gstvalue.h"
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#include "gstenumtypes.h"
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#include "gstquark.h"
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#include "gsturi.h"
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#include "gstbufferpool.h"
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GST_DEBUG_CATEGORY_STATIC (gst_query_debug);
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#define GST_CAT_DEFAULT gst_query_debug
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GType _gst_query_type = 0;
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typedef struct
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{
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GstQuery query;
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GstStructure *structure;
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} GstQueryImpl;
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#define GST_QUERY_STRUCTURE(q) (((GstQueryImpl *)(q))->structure)
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typedef struct
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{
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const gint type;
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const gchar *name;
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GQuark quark;
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} GstQueryQuarks;
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static GstQueryQuarks query_quarks[] = {
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{GST_QUERY_UNKNOWN, "unknown", 0},
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{GST_QUERY_POSITION, "position", 0},
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{GST_QUERY_DURATION, "duration", 0},
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{GST_QUERY_LATENCY, "latency", 0},
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{GST_QUERY_JITTER, "jitter", 0},
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{GST_QUERY_RATE, "rate", 0},
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{GST_QUERY_SEEKING, "seeking", 0},
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{GST_QUERY_SEGMENT, "segment", 0},
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{GST_QUERY_CONVERT, "convert", 0},
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{GST_QUERY_FORMATS, "formats", 0},
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{GST_QUERY_BUFFERING, "buffering", 0},
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{GST_QUERY_CUSTOM, "custom", 0},
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{GST_QUERY_URI, "uri", 0},
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{GST_QUERY_ALLOCATION, "allocation", 0},
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{GST_QUERY_SCHEDULING, "scheduling", 0},
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{GST_QUERY_ACCEPT_CAPS, "accept-caps", 0},
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{GST_QUERY_CAPS, "caps", 0},
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{GST_QUERY_DRAIN, "drain", 0},
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{GST_QUERY_CONTEXT, "context", 0},
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{0, NULL, 0}
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};
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GST_DEFINE_MINI_OBJECT_TYPE (GstQuery, gst_query);
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void
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_priv_gst_query_initialize (void)
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{
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gint i;
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_gst_query_type = gst_query_get_type ();
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GST_DEBUG_CATEGORY_INIT (gst_query_debug, "query", 0, "query system");
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for (i = 0; query_quarks[i].name; i++) {
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query_quarks[i].quark = g_quark_from_static_string (query_quarks[i].name);
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}
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}
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/**
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* gst_query_type_get_name:
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* @type: the query type
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*
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* Get a printable name for the given query type. Do not modify or free.
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*
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* Returns: a reference to the static name of the query.
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*/
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const gchar *
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gst_query_type_get_name (GstQueryType type)
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{
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gint i;
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for (i = 0; query_quarks[i].name; i++) {
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if (type == query_quarks[i].type)
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return query_quarks[i].name;
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}
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return "unknown";
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}
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/**
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* gst_query_type_to_quark:
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* @type: the query type
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*
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* Get the unique quark for the given query type.
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*
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* Returns: the quark associated with the query type
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*/
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GQuark
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gst_query_type_to_quark (GstQueryType type)
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{
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gint i;
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for (i = 0; query_quarks[i].name; i++) {
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if (type == query_quarks[i].type)
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return query_quarks[i].quark;
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}
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return 0;
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}
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/**
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* gst_query_type_get_flags:
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* @type: a #GstQueryType
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*
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* Gets the #GstQueryTypeFlags associated with @type.
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*
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* Returns: a #GstQueryTypeFlags.
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*/
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GstQueryTypeFlags
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gst_query_type_get_flags (GstQueryType type)
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{
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GstQueryTypeFlags ret;
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ret = type & ((1 << GST_QUERY_NUM_SHIFT) - 1);
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return ret;
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}
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static void
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_gst_query_free (GstQuery * query)
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{
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GstStructure *s;
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g_return_if_fail (query != NULL);
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s = GST_QUERY_STRUCTURE (query);
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if (s) {
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gst_structure_set_parent_refcount (s, NULL);
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gst_structure_free (s);
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}
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g_slice_free1 (sizeof (GstQueryImpl), query);
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}
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static GstQuery *
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_gst_query_copy (GstQuery * query)
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{
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GstQuery *copy;
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GstStructure *s;
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s = GST_QUERY_STRUCTURE (query);
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if (s) {
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s = gst_structure_copy (s);
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}
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copy = gst_query_new_custom (query->type, s);
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return copy;
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}
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/**
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* gst_query_new_position:
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* @format: the default #GstFormat for the new query
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*
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* Constructs a new query stream position query object. Use gst_query_unref()
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* when done with it. A position query is used to query the current position
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* of playback in the streams, in some format.
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*
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* Free-function: gst_query_unref
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*
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* Returns: (transfer full): a new #GstQuery
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*/
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GstQuery *
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gst_query_new_position (GstFormat format)
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{
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GstQuery *query;
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GstStructure *structure;
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structure = gst_structure_new_id (GST_QUARK (QUERY_POSITION),
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GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
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GST_QUARK (CURRENT), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
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query = gst_query_new_custom (GST_QUERY_POSITION, structure);
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return query;
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}
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/**
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* gst_query_set_position:
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* @query: a #GstQuery with query type GST_QUERY_POSITION
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* @format: the requested #GstFormat
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* @cur: the position to set
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*
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* Answer a position query by setting the requested value in the given format.
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*/
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void
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gst_query_set_position (GstQuery * query, GstFormat format, gint64 cur)
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{
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GstStructure *s;
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g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_POSITION);
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s = GST_QUERY_STRUCTURE (query);
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g_return_if_fail (format == g_value_get_enum (gst_structure_id_get_value (s,
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GST_QUARK (FORMAT))));
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gst_structure_id_set (s,
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GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
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GST_QUARK (CURRENT), G_TYPE_INT64, cur, NULL);
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}
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/**
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* gst_query_parse_position:
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* @query: a #GstQuery
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* @format: (out) (allow-none): the storage for the #GstFormat of the
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* position values (may be %NULL)
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* @cur: (out) (allow-none): the storage for the current position (may be %NULL)
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*
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* Parse a position query, writing the format into @format, and the position
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* into @cur, if the respective parameters are non-%NULL.
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*/
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void
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gst_query_parse_position (GstQuery * query, GstFormat * format, gint64 * cur)
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{
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GstStructure *structure;
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g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_POSITION);
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structure = GST_QUERY_STRUCTURE (query);
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if (format)
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*format =
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(GstFormat) g_value_get_enum (gst_structure_id_get_value (structure,
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GST_QUARK (FORMAT)));
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if (cur)
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*cur = g_value_get_int64 (gst_structure_id_get_value (structure,
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GST_QUARK (CURRENT)));
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}
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/**
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* gst_query_new_duration:
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* @format: the #GstFormat for this duration query
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*
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* Constructs a new stream duration query object to query in the given format.
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* Use gst_query_unref() when done with it. A duration query will give the
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* total length of the stream.
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*
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* Free-function: gst_query_unref
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*
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* Returns: (transfer full): a new #GstQuery
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*/
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GstQuery *
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gst_query_new_duration (GstFormat format)
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{
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GstQuery *query;
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GstStructure *structure;
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structure = gst_structure_new_id (GST_QUARK (QUERY_DURATION),
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GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
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GST_QUARK (DURATION), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
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query = gst_query_new_custom (GST_QUERY_DURATION, structure);
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return query;
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}
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/**
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* gst_query_set_duration:
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* @query: a #GstQuery
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* @format: the #GstFormat for the duration
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* @duration: the duration of the stream
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*
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* Answer a duration query by setting the requested value in the given format.
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*/
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void
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gst_query_set_duration (GstQuery * query, GstFormat format, gint64 duration)
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{
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GstStructure *s;
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g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_DURATION);
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s = GST_QUERY_STRUCTURE (query);
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g_return_if_fail (format == g_value_get_enum (gst_structure_id_get_value (s,
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GST_QUARK (FORMAT))));
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gst_structure_id_set (s, GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
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GST_QUARK (DURATION), G_TYPE_INT64, duration, NULL);
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}
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/**
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* gst_query_parse_duration:
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* @query: a #GstQuery
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* @format: (out) (allow-none): the storage for the #GstFormat of the duration
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* value, or %NULL.
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* @duration: (out) (allow-none): the storage for the total duration, or %NULL.
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*
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* Parse a duration query answer. Write the format of the duration into @format,
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* and the value into @duration, if the respective variables are non-%NULL.
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*/
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void
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gst_query_parse_duration (GstQuery * query, GstFormat * format,
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gint64 * duration)
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{
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GstStructure *structure;
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g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_DURATION);
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structure = GST_QUERY_STRUCTURE (query);
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if (format)
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*format =
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(GstFormat) g_value_get_enum (gst_structure_id_get_value (structure,
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GST_QUARK (FORMAT)));
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if (duration)
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*duration = g_value_get_int64 (gst_structure_id_get_value (structure,
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GST_QUARK (DURATION)));
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}
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/**
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* gst_query_new_latency:
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*
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* Constructs a new latency query object.
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* Use gst_query_unref() when done with it. A latency query is usually performed
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* by sinks to compensate for additional latency introduced by elements in the
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* pipeline.
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*
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* Free-function: gst_query_unref
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*
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* Returns: (transfer full): a #GstQuery
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*/
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GstQuery *
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gst_query_new_latency (void)
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{
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GstQuery *query;
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GstStructure *structure;
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structure = gst_structure_new_id (GST_QUARK (QUERY_LATENCY),
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GST_QUARK (LIVE), G_TYPE_BOOLEAN, FALSE,
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GST_QUARK (MIN_LATENCY), G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
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GST_QUARK (MAX_LATENCY), G_TYPE_UINT64, G_GUINT64_CONSTANT (-1), NULL);
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query = gst_query_new_custom (GST_QUERY_LATENCY, structure);
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return query;
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}
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/**
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* gst_query_set_latency:
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* @query: a #GstQuery
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* @live: if there is a live element upstream
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* @min_latency: the minimal latency of the upstream elements
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* @max_latency: the maximal latency of the upstream elements
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*
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* Answer a latency query by setting the requested values in the given format.
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*/
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void
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gst_query_set_latency (GstQuery * query, gboolean live,
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GstClockTime min_latency, GstClockTime max_latency)
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{
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GstStructure *structure;
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g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_LATENCY);
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g_return_if_fail (GST_CLOCK_TIME_IS_VALID (min_latency));
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structure = GST_QUERY_STRUCTURE (query);
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gst_structure_id_set (structure,
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GST_QUARK (LIVE), G_TYPE_BOOLEAN, live,
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GST_QUARK (MIN_LATENCY), G_TYPE_UINT64, min_latency,
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GST_QUARK (MAX_LATENCY), G_TYPE_UINT64, max_latency, NULL);
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}
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/**
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* gst_query_parse_latency:
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* @query: a #GstQuery
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* @live: (out) (allow-none): storage for live or %NULL
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* @min_latency: (out) (allow-none): the storage for the min latency or %NULL
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* @max_latency: (out) (allow-none): the storage for the max latency or %NULL
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*
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* Parse a latency query answer.
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*/
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void
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gst_query_parse_latency (GstQuery * query, gboolean * live,
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GstClockTime * min_latency, GstClockTime * max_latency)
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{
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GstStructure *structure;
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g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_LATENCY);
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structure = GST_QUERY_STRUCTURE (query);
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if (live)
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*live =
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g_value_get_boolean (gst_structure_id_get_value (structure,
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GST_QUARK (LIVE)));
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if (min_latency)
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*min_latency = g_value_get_uint64 (gst_structure_id_get_value (structure,
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GST_QUARK (MIN_LATENCY)));
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if (max_latency)
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*max_latency = g_value_get_uint64 (gst_structure_id_get_value (structure,
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GST_QUARK (MAX_LATENCY)));
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}
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/**
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* gst_query_new_convert:
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* @src_format: the source #GstFormat for the new query
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* @value: the value to convert
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* @dest_format: the target #GstFormat
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*
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* Constructs a new convert query object. Use gst_query_unref()
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* when done with it. A convert query is used to ask for a conversion between
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* one format and another.
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*
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* Free-function: gst_query_unref
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*
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* Returns: (transfer full): a #GstQuery
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*/
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GstQuery *
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gst_query_new_convert (GstFormat src_format, gint64 value,
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GstFormat dest_format)
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{
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GstQuery *query;
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GstStructure *structure;
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structure = gst_structure_new_id (GST_QUARK (QUERY_CONVERT),
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GST_QUARK (SRC_FORMAT), GST_TYPE_FORMAT, src_format,
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GST_QUARK (SRC_VALUE), G_TYPE_INT64, value,
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GST_QUARK (DEST_FORMAT), GST_TYPE_FORMAT, dest_format,
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GST_QUARK (DEST_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
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query = gst_query_new_custom (GST_QUERY_CONVERT, structure);
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return query;
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}
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|
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/**
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* gst_query_set_convert:
|
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* @query: a #GstQuery
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* @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: (allow-none) (transfer full): 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 guaranteed 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 %NULL
|
|
* @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 remaining in
|
|
* milliseconds
|
|
*
|
|
* 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 remaining in milliseconds, 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) (transfer full) (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_set_uri_redirection:
|
|
* @query: a #GstQuery with query type GST_QUERY_URI
|
|
* @uri: the URI to set
|
|
*
|
|
* Answer a URI query by setting the requested URI redirection.
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
void
|
|
gst_query_set_uri_redirection (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_REDIRECTION),
|
|
G_TYPE_STRING, uri, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_query_parse_uri_redirection:
|
|
* @query: a #GstQuery
|
|
* @uri: (out) (transfer full) (allow-none): the storage for the redirect 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: 1.2
|
|
*/
|
|
void
|
|
gst_query_parse_uri_redirection (GstQuery * query, gchar ** uri)
|
|
{
|
|
GstStructure *structure;
|
|
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_URI);
|
|
|
|
structure = GST_QUERY_STRUCTURE (query);
|
|
if (uri) {
|
|
if (!gst_structure_id_get (structure, GST_QUARK (URI_REDIRECTION),
|
|
G_TYPE_STRING, uri, NULL))
|
|
*uri = NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_query_set_uri_redirection_permanent:
|
|
* @query: a #GstQuery with query type %GST_QUERY_URI
|
|
* @permanent: whether the redirect is permanent or not
|
|
*
|
|
* Answer a URI query by setting the requested URI redirection
|
|
* to permanent or not.
|
|
*
|
|
* Since: 1.4
|
|
*/
|
|
void
|
|
gst_query_set_uri_redirection_permanent (GstQuery * query, gboolean permanent)
|
|
{
|
|
GstStructure *structure;
|
|
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_URI);
|
|
g_return_if_fail (gst_query_is_writable (query));
|
|
|
|
structure = GST_QUERY_STRUCTURE (query);
|
|
gst_structure_id_set (structure, GST_QUARK (URI_REDIRECTION_PERMANENT),
|
|
G_TYPE_BOOLEAN, permanent, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_query_parse_uri_redirection_permanent:
|
|
* @query: a #GstQuery
|
|
* @permanent: (out) (allow-none): if the URI redirection is permanent
|
|
* (may be %NULL)
|
|
*
|
|
* Parse an URI query, and set @permanent to %TRUE if there is a redirection
|
|
* and it should be considered permanent. If a redirection is permanent,
|
|
* applications should update their internal storage of the URI, otherwise
|
|
* they should make all future requests to the original URI.
|
|
*
|
|
* Since: 1.4
|
|
*/
|
|
void
|
|
gst_query_parse_uri_redirection_permanent (GstQuery * query,
|
|
gboolean * permanent)
|
|
{
|
|
GstStructure *structure;
|
|
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_URI);
|
|
|
|
structure = GST_QUERY_STRUCTURE (query);
|
|
if (permanent) {
|
|
if (!gst_structure_id_get (structure, GST_QUARK (URI_REDIRECTION_PERMANENT),
|
|
G_TYPE_BOOLEAN, permanent, NULL))
|
|
*permanent = FALSE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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: (transfer none) (allow-none): 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));
|
|
|
|
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: (transfer none) (allow-none): 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.
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
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) (transfer none) (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) (transfer none) (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 allocator 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 allocator 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.
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
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 one 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) (transfer none): 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) (transfer none): 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) (transfer none): 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:
|
|
* @context_type: Context type to query
|
|
*
|
|
* Constructs a new query object for querying the pipeline-local context.
|
|
*
|
|
* Free-function: gst_query_unref
|
|
*
|
|
* Returns: (transfer full): a new #GstQuery
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
GstQuery *
|
|
gst_query_new_context (const gchar * context_type)
|
|
{
|
|
GstQuery *query;
|
|
GstStructure *structure;
|
|
|
|
g_return_val_if_fail (context_type != NULL, NULL);
|
|
|
|
structure = gst_structure_new_id (GST_QUARK (QUERY_CONTEXT),
|
|
GST_QUARK (CONTEXT_TYPE), G_TYPE_STRING, context_type, NULL);
|
|
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.
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
void
|
|
gst_query_set_context (GstQuery * query, GstContext * context)
|
|
{
|
|
GstStructure *s;
|
|
const gchar *context_type;
|
|
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONTEXT);
|
|
|
|
gst_query_parse_context_type (query, &context_type);
|
|
g_return_if_fail (strcmp (gst_context_get_context_type (context),
|
|
context_type) == 0);
|
|
|
|
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) (transfer none): A pointer to store the #GstContext
|
|
*
|
|
* Get the context from the context @query. The context remains valid as long as
|
|
* @query remains valid.
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
void
|
|
gst_query_parse_context (GstQuery * query, GstContext ** context)
|
|
{
|
|
GstStructure *structure;
|
|
const GValue *v;
|
|
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONTEXT);
|
|
g_return_if_fail (context != NULL);
|
|
|
|
structure = GST_QUERY_STRUCTURE (query);
|
|
v = gst_structure_id_get_value (structure, GST_QUARK (CONTEXT));
|
|
if (v)
|
|
*context = g_value_get_boxed (v);
|
|
else
|
|
*context = NULL;
|
|
}
|
|
|
|
/**
|
|
* gst_query_parse_context_type:
|
|
* @query: a GST_QUERY_CONTEXT type query
|
|
* @context_type: (out) (transfer none) (allow-none): the context type, or %NULL
|
|
*
|
|
* Parse a context type from an existing GST_QUERY_CONTEXT query.
|
|
*
|
|
* Returns: a #gboolean indicating if the parsing succeeded.
|
|
*
|
|
* Since: 1.2
|
|
*/
|
|
gboolean
|
|
gst_query_parse_context_type (GstQuery * query, const gchar ** context_type)
|
|
{
|
|
GstStructure *structure;
|
|
const GValue *value;
|
|
|
|
g_return_val_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONTEXT, FALSE);
|
|
|
|
structure = GST_QUERY_STRUCTURE (query);
|
|
|
|
if (context_type) {
|
|
value = gst_structure_id_get_value (structure, GST_QUARK (CONTEXT_TYPE));
|
|
*context_type = g_value_get_string (value);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|