Gst.Query

Queries can be performed on pads (Gst.Pad.prototype.query) and elements (Gst.Element.prototype.query). Please note that some queries might need a running pipeline to work.

Queries can be created using the gst_query_new_*() functions. Query values can be set using gst_query_set_*(), and parsed using gst_query_parse_*() helpers.

The following example shows how to query the duration of a pipeline:

<example> <title>Query duration on a pipeline</title> <programlisting> GstQuery *query; gboolean res; query = gst_query_new_duration (GST_FORMAT_TIME); res = gst_element_query (pipeline, query); if (res) { gint64 duration; gst_query_parse_duration (query, NULL, &amp;duration); g_print ("duration = %"GST_TIME_FORMAT, GST_TIME_ARGS (duration)); } else { g_print ("duration query failed..."); } gst_query_unref (query); </programlisting> </example>

Last reviewed on 2012-03-29 (0.11.3)

Gst.Query.new_accept_caps
Gst.Query.new_allocation
Gst.Query.new_buffering
Gst.Query.new_caps
Gst.Query.new_context
Gst.Query.new_convert
Gst.Query.new_custom
Gst.Query.new_drain
Gst.Query.new_duration
Gst.Query.new_formats
Gst.Query.new_latency
Gst.Query.new_position
Gst.Query.new_scheduling
Gst.Query.new_seeking
Gst.Query.new_segment
Gst.Query.new_uri
Gst.Query.prototype.add_allocation_meta
Gst.Query.prototype.add_allocation_param
Gst.Query.prototype.add_allocation_pool
Gst.Query.prototype.add_buffering_range
Gst.Query.prototype.add_context_type
Gst.Query.prototype.add_scheduling_mode
Gst.Query.prototype.find_allocation_meta
Gst.Query.prototype.get_n_allocation_metas
Gst.Query.prototype.get_n_allocation_params
Gst.Query.prototype.get_n_allocation_pools
Gst.Query.prototype.get_n_buffering_ranges
Gst.Query.prototype.get_n_context_types
Gst.Query.prototype.get_n_scheduling_modes
Gst.Query.prototype.get_structure
Gst.Query.prototype.has_scheduling_mode
Gst.Query.prototype.has_scheduling_mode_with_flags
Gst.Query.prototype.parse_accept_caps
Gst.Query.prototype.parse_accept_caps_result
Gst.Query.prototype.parse_allocation
Gst.Query.prototype.parse_buffering_percent
Gst.Query.prototype.parse_buffering_range
Gst.Query.prototype.parse_buffering_stats
Gst.Query.prototype.parse_caps
Gst.Query.prototype.parse_caps_result
Gst.Query.prototype.parse_context
Gst.Query.prototype.parse_convert
Gst.Query.prototype.parse_duration
Gst.Query.prototype.parse_latency
Gst.Query.prototype.parse_n_formats
Gst.Query.prototype.parse_nth_allocation_meta
Gst.Query.prototype.parse_nth_allocation_param
Gst.Query.prototype.parse_nth_allocation_pool
Gst.Query.prototype.parse_nth_buffering_range
Gst.Query.prototype.parse_nth_context_type
Gst.Query.prototype.parse_nth_format
Gst.Query.prototype.parse_nth_scheduling_mode
Gst.Query.prototype.parse_position
Gst.Query.prototype.parse_scheduling
Gst.Query.prototype.parse_seeking
Gst.Query.prototype.parse_segment
Gst.Query.prototype.parse_uri
Gst.Query.prototype.remove_nth_allocation_meta
Gst.Query.prototype.remove_nth_allocation_param
Gst.Query.prototype.remove_nth_allocation_pool
Gst.Query.prototype.set_accept_caps_result
Gst.Query.prototype.set_buffering_percent
Gst.Query.prototype.set_buffering_range
Gst.Query.prototype.set_buffering_stats
Gst.Query.prototype.set_caps_result
Gst.Query.prototype.set_context
Gst.Query.prototype.set_convert
Gst.Query.prototype.set_duration
Gst.Query.prototype.set_formatsv
Gst.Query.prototype.set_latency
Gst.Query.prototype.set_nth_allocation_param
Gst.Query.prototype.set_nth_allocation_pool
Gst.Query.prototype.set_position
Gst.Query.prototype.set_scheduling
Gst.Query.prototype.set_seeking
Gst.Query.prototype.set_segment
Gst.Query.prototype.set_uri
Gst.Query.prototype.writable_structure