Query

Object Hierarchy:

Description:

  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, &duration);
    g_print ("duration = %"GST_TIME_FORMAT, GST_TIME_ARGS (duration));
  } else {
    g_print ("duration query failed...");
  }
  gst_query_unref (query);

Content:

Static methods:

• public static bool take (ref Query? old_query, owned Query? new_query)

Creation methods:

• public Query.accept_caps (Caps caps)
  Constructs a new query object for querying if caps are accepted.
• public Query.allocation (Caps? caps, bool need_pool)
  Constructs a new query object for querying the allocation properties.
• public Query.bitrate ()
  Constructs a new query object for querying the bitrate.
• public Query.buffering (Format format)
  Constructs a new query object for querying the buffering status of a stream.
• public Query.caps (Caps filter)
  Constructs a new query object for querying the caps.
• public Query.context (string context_type)
  Constructs a new query object for querying the pipeline-local context.
• public Query.convert (Format src_format, int64 value, Format dest_format)
  Constructs a new convert query object.
• public Query.custom (QueryType type, owned Structure? structure)
  Constructs a new custom query object.
• public Query.drain ()
  Constructs a new query object for querying the drain state.
• public Query.duration (Format format)
  Constructs a new stream duration query object to query in the given format.
• public Query.formats ()
  Constructs a new query object for querying formats of the stream.
• public Query.latency ()
  Constructs a new latency query object.
• public Query.position (Format format)
  Constructs a new query stream position query object.
• public Query.scheduling ()
  Constructs a new query object for querying the scheduling properties.
• public Query.seeking (Format format)
  Constructs a new query object for querying seeking properties of the stream.
• public Query.segment (Format format)
  Constructs a new segment query object.
• public Query.selectable ()
  Constructs a new query object for querying the stream selection capability.
• public Query.uri ()
  Constructs a new query URI query object.

Methods:

• public unowned Query @ref ()
  Increases the refcount of the given query by one.
• public void add_allocation_meta (Type api, Structure? @params)
  Add api with params as one of the supported metadata API to this.
• public void add_allocation_param (Allocator? allocator, AllocationParams? @params)
  Add allocator and its params as a supported memory allocator.
• public void add_allocation_pool (BufferPool? pool, uint size, uint min_buffers, uint max_buffers)
  Set the pool parameters in this.
• public bool add_buffering_range (int64 start, int64 stop)
  Set the buffering-ranges array field in this .
• public void add_scheduling_mode (PadMode mode)
  Add mode as one of the supported scheduling modes to this.
• public bool find_allocation_meta (Type api, out uint index)
  Check if this has metadata api set.
• public uint get_n_allocation_metas ()
  Retrieve the number of values currently stored in the meta API array of the query's structure.
• public uint get_n_allocation_params ()
  Retrieve the number of values currently stored in the allocator params array of the query's structure.
• public uint get_n_allocation_pools ()
  Retrieve the number of values currently stored in the pool array of the query's structure.
• public uint get_n_buffering_ranges ()
  Retrieve the number of values currently stored in the buffered-ranges array of the query's structure.
• public uint get_n_scheduling_modes ()
  Retrieve the number of values currently stored in the scheduling mode array of the query's structure.
• public unowned Structure? get_structure ()
  Get the structure of a query.
• public bool has_scheduling_mode (PadMode mode)
  Check if this has scheduling mode set.
• public bool has_scheduling_mode_with_flags (PadMode mode, SchedulingFlags flags)
  Check if this has scheduling mode set and flags is set in query scheduling flags.
• public void parse_accept_caps (out unowned Caps caps)
  Get the caps from this.
• public void parse_accept_caps_result (out bool result)
  Parse the result from this and store in result.
• public void parse_allocation (out unowned Caps? caps, out bool need_pool)
  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.
• public void parse_bitrate (out uint nominal_bitrate)
  Get the results of a bitrate query.
• public void parse_buffering_percent (out bool busy, out int percent)
  Get the percentage of buffered data.
• public void parse_buffering_range (out Format format, out int64 start, out int64 stop, out int64 estimated_total)
  Parse an available query, writing the format into format, and other results into the passed parameters, if the respective parameters are non-%NULL
• public void parse_buffering_stats (out BufferingMode mode, out int avg_in, out int avg_out, out int64 buffering_left)
  Extracts the buffering stats values from this .
• public void parse_caps (out unowned Caps filter)
  Get the filter from the caps this.
• public void parse_caps_result (out unowned Caps? caps)
  Get the caps result from this.
• public void parse_context (out unowned Context? context)
  Get the context from the context this.
• public bool parse_context_type (out unowned string context_type)
  Parse a context type from an existing GST_QUERY_CONTEXT query.
• public void parse_convert (out Format src_format, out int64 src_value, out Format dest_format, out int64 dest_value)
  Parse a convert query answer.
• public void parse_duration (out Format format, out int64 duration)
  Parse a duration query answer.
• public void parse_latency (out bool live, out ClockTime min_latency, out ClockTime max_latency)
  Parse a latency query answer.
• public void parse_n_formats (out uint n_formats)
  Parse the number of formats in the formats this .
• public Type parse_nth_allocation_meta (uint index, out unowned Structure @params)
  Parse an available query and get the metadata API at index of the metadata API array.
• public void parse_nth_allocation_param (uint index, out Allocator? allocator, out unowned AllocationParams @params)
  Parse an available query and get the allocator and its params at index of the allocator array.
• public void parse_nth_allocation_pool (uint index, out BufferPool? pool, out uint size, out uint min_buffers, out uint max_buffers)
  Get the pool parameters in this.
• public bool parse_nth_buffering_range (uint index, out int64 start, out int64 stop)
  Parse an available query and get the start and stop values stored at the index of the buffered ranges array.
• public void parse_nth_format (uint nth, out Format format)
  Parse the format query and retrieve the nth format from it into format.
• public PadMode parse_nth_scheduling_mode (uint index)
  Parse an available query and get the scheduling mode at index of the scheduling modes array.
• public void parse_position (out Format format, out int64 cur)
  Parse a position query, writing the format into format, and the position into cur, if the respective parameters are non-%NULL.
• public void parse_scheduling (out SchedulingFlags flags, out int minsize, out int maxsize, out int align)
  Set the scheduling properties.
• public void parse_seeking (out Format format, out bool seekable, out int64 segment_start, out int64 segment_end)
  Parse a seeking query, writing the format into format, and other results into the passed parameters, if the respective parameters are non-%NULL
• public void parse_segment (out double rate, out Format format, out int64 start_value, out int64 stop_value)
  Parse a segment query answer.
• public void parse_selectable (out bool selectable)
  Get the results of a selectable query.
• public void parse_uri (out string? uri)
  Parse an URI query, writing the URI into uri as a newly allocated string, if the respective parameters are non-%NULL.
• public void parse_uri_redirection (out string? uri)
  Parse an URI query, writing the URI into uri as a newly allocated string, if the respective parameters are non-%NULL.
• public void parse_uri_redirection_permanent (out bool permanent)
  Parse an URI query, and set permanent to true if there is a redirection and it should be considered permanent.
• public void remove_nth_allocation_meta (uint index)
  Remove the metadata API at index of the metadata API array.
• public void remove_nth_allocation_param (uint index)
  Remove the allocation param at index of the allocation param array.
• public void remove_nth_allocation_pool (uint index)
  Remove the allocation pool at index of the allocation pool array.
• public void set_accept_caps_result (bool result)
  Set result as the result for the this.
• public void set_bitrate (uint nominal_bitrate)
  Set the results of a bitrate query.
• public void set_buffering_percent (bool busy, int percent)
  Set the percentage of buffered data.
• public void set_buffering_range (Format format, int64 start, int64 stop, int64 estimated_total)
  Set the available query result fields in this .
• public void set_buffering_stats (BufferingMode mode, int avg_in, int avg_out, int64 buffering_left)
  Configures the buffering stats values in this .
• public void set_caps_result (Caps? caps)
  Set the caps result in this.
• public void set_context (Context? context)
  Answer a context query by setting the requested context.
• public void set_convert (Format src_format, int64 src_value, Format dest_format, int64 dest_value)
  Answer a convert query by setting the requested values.
• public void set_duration (Format format, int64 duration)
  Answer a duration query by setting the requested value in the given format.
• public void set_formats (int n_formats, Format[] formats)
  Set the formats query result fields in this .
• public void set_formatsv (Format[] formats)
  Set the formats query result fields in this .
• public void set_latency (bool live, ClockTime min_latency, ClockTime max_latency)
  Answer a latency query by setting the requested values in the given format.
• public void set_nth_allocation_param (uint index, Allocator? allocator, AllocationParams? @params)
  Parse an available query and get the allocator and its params at index of the allocator array.
• public void set_nth_allocation_pool (uint index, BufferPool? pool, uint size, uint min_buffers, uint max_buffers)
  Set the pool parameters in this.
• public void set_position (Format format, int64 cur)
  Answer a position query by setting the requested value in the given format.
• public void set_scheduling (SchedulingFlags flags, int minsize, int maxsize, int align)
  Set the scheduling properties.
• public void set_seeking (Format format, bool seekable, int64 segment_start, int64 segment_end)
  Set the seeking query result fields in this .
• public void set_segment (double rate, Format format, int64 start_value, int64 stop_value)
  Answer a segment query by setting the requested values.
• public void set_selectable (bool selectable)
  Set the results of a selectable query.
• public void set_uri (string? uri)
  Answer a URI query by setting the requested URI.
• public void set_uri_redirection (string? uri)
  Answer a URI query by setting the requested URI redirection.
• public void set_uri_redirection_permanent (bool permanent)
  Answer a URI query by setting the requested URI redirection to permanent or not.
• public unowned Structure writable_structure ()
  Get the structure of a query.

Fields:

• public QueryType type

Inherited Members: