X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=gst%2Fgstquery.c;h=076b8dca9cdba7c12a74850c6e1dccdc68123876;hb=e10266e3f3cf9b05b69198b1ac6faa9a62840e30;hp=021c52765026ead2c34858e94c9e24643c82e52b;hpb=8e946d5d1692bf6865cd3bd262c49fe89970d8e8;p=platform%2Fupstream%2Fgstreamer.git
diff --git a/gst/gstquery.c b/gst/gstquery.c
index 021c527..076b8dc 100644
--- a/gst/gstquery.c
+++ b/gst/gstquery.c
@@ -17,8 +17,8 @@
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
*/
/**
@@ -36,27 +36,20 @@
* gst_query_parse_*() helpers.
*
* The following example shows how to query the duration of a pipeline:
- *
- *
- * Query duration on a pipeline
- *
- * 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);
- *
- *
- *
- * Last reviewed on 2012-03-29 (0.11.3)
+ * |[
+ * 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);
+ * ]|
*/
@@ -110,6 +103,7 @@ static GstQueryQuarks query_quarks[] = {
{GST_QUERY_ACCEPT_CAPS, "accept-caps", 0},
{GST_QUERY_CAPS, "caps", 0},
{GST_QUERY_DRAIN, "drain", 0},
+ {GST_QUERY_CONTEXT, "context", 0},
{0, NULL, 0}
};
@@ -274,11 +268,11 @@ gst_query_set_position (GstQuery * query, GstFormat format, gint64 cur)
* gst_query_parse_position:
* @query: a #GstQuery
* @format: (out) (allow-none): the storage for the #GstFormat of the
- * position values (may be NULL)
- * @cur: (out) (allow-none): the storage for the current position (may be NULL)
+ * position values (may be %NULL)
+ * @cur: (out) (allow-none): the storage for the current position (may be %NULL)
*
* Parse a position query, writing the format into @format, and the position
- * into @cur, if the respective parameters are non-NULL.
+ * into @cur, if the respective parameters are non-%NULL.
*/
void
gst_query_parse_position (GstQuery * query, GstFormat * format, gint64 * cur)
@@ -351,11 +345,11 @@ gst_query_set_duration (GstQuery * query, GstFormat format, gint64 duration)
* gst_query_parse_duration:
* @query: a #GstQuery
* @format: (out) (allow-none): the storage for the #GstFormat of the duration
- * value, or NULL.
- * @duration: (out) (allow-none): the storage for the total duration, or NULL.
+ * value, or %NULL.
+ * @duration: (out) (allow-none): the storage for the total duration, or %NULL.
*
* Parse a duration query answer. Write the format of the duration into @format,
- * and the value into @duration, if the respective variables are non-NULL.
+ * and the value into @duration, if the respective variables are non-%NULL.
*/
void
gst_query_parse_duration (GstQuery * query, GstFormat * format,
@@ -430,9 +424,9 @@ gst_query_set_latency (GstQuery * query, gboolean live,
/**
* gst_query_parse_latency:
* @query: a #GstQuery
- * @live: (out) (allow-none): storage for live or NULL
- * @min_latency: (out) (allow-none): the storage for the min latency or NULL
- * @max_latency: (out) (allow-none): the storage for the max latency or NULL
+ * @live: (out) (allow-none): storage for live or %NULL
+ * @min_latency: (out) (allow-none): the storage for the min latency or %NULL
+ * @max_latency: (out) (allow-none): the storage for the max latency or %NULL
*
* Parse a latency query answer.
*/
@@ -519,15 +513,15 @@ gst_query_set_convert (GstQuery * query, GstFormat src_format, gint64 src_value,
* 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
+ * 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
+ * destination value, or %NULL
* @dest_value: (out) (allow-none): the storage for the destination value,
- * or NULL
+ * 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.
+ * and @dest_value may be %NULL, in which case that value is omitted.
*/
void
gst_query_parse_convert (GstQuery * query, GstFormat * src_format,
@@ -622,14 +616,14 @@ gst_query_set_segment (GstQuery * query, gdouble rate, GstFormat format,
/**
* gst_query_parse_segment:
* @query: a #GstQuery
- * @rate: (out) (allow-none): the storage for the rate of the segment, or NULL
+ * @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
+ * 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.
+ * @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.
*/
@@ -660,7 +654,7 @@ gst_query_parse_segment (GstQuery * query, gdouble * rate, GstFormat * format,
/**
* gst_query_new_custom:
* @type: the query type
- * @structure: a structure for the query
+ * @structure: (allow-none) (transfer full): a structure for the query
*
* Constructs a new custom query object. Use gst_query_unref()
* when done with it.
@@ -726,7 +720,7 @@ gst_query_get_structure (GstQuery * query)
* @query: a #GstQuery
*
* Get the structure of a query. This method should be called with a writable
- * @query so that the returned structure is guranteed to be writable.
+ * @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
@@ -800,14 +794,14 @@ gst_query_set_seeking (GstQuery * query, GstFormat format,
* 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
+ * 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
+ * are non-%NULL
*/
void
gst_query_parse_seeking (GstQuery * query, GstFormat * format,
@@ -1080,8 +1074,8 @@ gst_query_set_buffering_percent (GstQuery * query, gboolean busy, gint percent)
/**
* 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
+ * @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.
@@ -1109,7 +1103,7 @@ gst_query_parse_buffering_percent (GstQuery * query, gboolean * busy,
* @mode: a buffering mode
* @avg_in: the average input rate
* @avg_out: the average output rate
- * @buffering_left: amount of buffering time left
+ * @buffering_left: amount of buffering time left in milliseconds
*
* Configures the buffering stats values in @query.
*/
@@ -1133,10 +1127,11 @@ gst_query_set_buffering_stats (GstQuery * query, GstBufferingMode mode,
/**
* gst_query_parse_buffering_stats:
* @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
- * @mode: (out) (allow-none): a buffering mode, or NULL
- * @avg_in: (out) (allow-none): the average input rate, or NULL
- * @avg_out: (out) (allow-none): the average output rat, or NULLe
- * @buffering_left: (out) (allow-none): amount of buffering time left, or NULL
+ * @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.
*/
@@ -1172,7 +1167,8 @@ gst_query_parse_buffering_stats (GstQuery * query,
* @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
+ * @estimated_total: estimated total amount of download time remaining in
+ * milliseconds
*
* Set the available query result fields in @query.
*/
@@ -1197,15 +1193,15 @@ gst_query_set_buffering_range (GstQuery * query, GstFormat format,
* 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
+ * and @segment_end values, or %NULL
+ * @start: (out) (allow-none): the start to set, or %NULL
+ * @stop: (out) (allow-none): the stop to set, or %NULL
* @estimated_total: (out) (allow-none): estimated total amount of download
- * time, or NULL
+ * 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
+ * are non-%NULL
*/
void
gst_query_parse_buffering_range (GstQuery * query, GstFormat * format,
@@ -1312,8 +1308,8 @@ gst_query_get_n_buffering_ranges (GstQuery * query)
* 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
+ * @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.
@@ -1395,11 +1391,11 @@ gst_query_set_uri (GstQuery * query, const gchar * uri)
/**
* gst_query_parse_uri:
* @query: a #GstQuery
- * @uri: (out callee-allocates) (allow-none): the storage for the current URI
- * (may be NULL)
+ * @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.
+ * allocated string, if the respective parameters are non-%NULL.
* Free the string with g_free() after usage.
*/
void
@@ -1416,6 +1412,108 @@ gst_query_parse_uri (GstQuery * query, gchar ** 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
@@ -1449,7 +1547,7 @@ gst_query_new_allocation (GstCaps * caps, gboolean 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.
+ * are non-%NULL.
*/
void
gst_query_parse_allocation (GstQuery * query, GstCaps ** caps,
@@ -1622,6 +1720,33 @@ gst_query_set_nth_allocation_pool (GstQuery * query, guint index,
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;
@@ -1695,7 +1820,7 @@ gst_query_get_n_allocation_metas (GstQuery * query)
* gst_query_parse_nth_allocation_meta:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @index: position in the metadata API array to read
- * @params: (out) (allow-none): API specific flags
+ * @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.
@@ -1756,13 +1881,13 @@ gst_query_remove_nth_allocation_meta (GstQuery * query, guint index)
* gst_query_find_allocation_meta:
* @query: a GST_QUERY_ALLOCATION type query #GstQuery
* @api: the metadata API
- * @index: (out) (allow-none): the index
+ * @index: (out) (transfer none) (allow-none): the index
*
- * Check if @query has metadata @api set. When this function returns TRUE,
+ * 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.
+ * Returns: %TRUE when @api is in the list of metadata.
*/
gboolean
gst_query_find_allocation_meta (GstQuery * query, GType api, guint * index)
@@ -1846,7 +1971,9 @@ gst_query_add_allocation_param (GstQuery * query, GstAllocator * allocator,
* allocator params array of the query's structure.
*
* If no memory allocator is specified, the downstream element can handle
- * the default memory allocator.
+ * 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.
*/
@@ -1869,10 +1996,10 @@ gst_query_get_n_allocation_params (GstQuery * query)
* 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 none) (allow-none): variable to hold the result
+ * @allocator: (out) (transfer full) (allow-none): variable to hold the result
* @params: (out) (allow-none): parameters for the allocator
*
- * Parse an available query and get the alloctor and its params
+ * Parse an available query and get the allocator and its params
* at @index of the allocator array.
*/
void
@@ -1906,7 +2033,7 @@ gst_query_parse_nth_allocation_param (GstQuery * query, guint index,
* @allocator: (transfer none) (allow-none): new allocator to set
* @params: (transfer none) (allow-none): parameters for the allocator
*
- * Parse an available query and get the alloctor and its params
+ * Parse an available query and get the allocator and its params
* at @index of the allocator array.
*/
void
@@ -1938,6 +2065,33 @@ gst_query_set_nth_allocation_param (GstQuery * query, guint index,
}
/**
+ * 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.
@@ -2020,7 +2174,7 @@ gst_query_parse_scheduling (GstQuery * query, GstSchedulingFlags * flags,
* @query: a GST_QUERY_SCHEDULING type query #GstQuery
* @mode: a #GstPadMode
*
- * Add @mode as aone of the supported scheduling modes to @query.
+ * Add @mode as one of the supported scheduling modes to @query.
*/
void
gst_query_add_scheduling_mode (GstQuery * query, GstPadMode mode)
@@ -2096,7 +2250,17 @@ gst_query_parse_nth_scheduling_mode (GstQuery * query, guint index)
*
* Check if @query has scheduling mode set.
*
- * Returns: TRUE when @mode is in the list of scheduling modes.
+ *
+ *
+ * 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).
+ *
+ *
+ *
+ * Returns: %TRUE when @mode is in the list of scheduling modes.
*/
gboolean
gst_query_has_scheduling_mode (GstQuery * query, GstPadMode mode)
@@ -2120,6 +2284,32 @@ gst_query_has_scheduling_mode (GstQuery * query, GstPadMode mode)
}
/**
+ * 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
*
@@ -2148,7 +2338,7 @@ gst_query_new_accept_caps (GstCaps * caps)
/**
* gst_query_parse_accept_caps:
* @query: The query to parse
- * @caps: (out): A pointer to the caps
+ * @caps: (out) (transfer none): A pointer to the caps
*
* Get the caps from @query. The caps remains valid as long as @query remains
* valid.
@@ -2249,7 +2439,7 @@ gst_query_new_caps (GstCaps * filter)
/**
* gst_query_parse_caps:
* @query: The query to parse
- * @filter: (out): A pointer to the caps filter
+ * @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.
@@ -2289,7 +2479,7 @@ gst_query_set_caps_result (GstQuery * query, GstCaps * caps)
/**
* gst_query_parse_caps_result:
* @query: The query to parse
- * @caps: (out): A pointer to the caps
+ * @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.
@@ -2341,3 +2531,113 @@ gst_query_new_drain (void)
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;
+}