diff --git a/gst/gstquery.c b/gst/gstquery.c
index 2b1c382294b5008617f0f2756de355ef09318205..1d7f5f99b4e6a354e538ac3456d70e8941c5fb57 100644 (file)
--- a/gst/gstquery.c
+++ b/gst/gstquery.c
{GST_QUERY_BUFFERING, "buffering", "Buffering status", 0},
{GST_QUERY_CUSTOM, "custom", "Custom query", 0},
{GST_QUERY_URI, "uri", "URI of the source or sink", 0},
+ {GST_QUERY_BUFFERS, "buffers", "Minimum buffer requirements", 0},
{GST_QUERY_NONE, NULL, NULL, 0}
};
*uri = g_value_dup_string (gst_structure_id_get_value (query->structure,
GST_QUARK (URI)));
}
+
+/**
+ * gst_query_new_buffers:
+ * @caps: the #GstCaps for the buffers that are going to be allocated
+ *
+ * Constructs a new buffer requirements query object to query buffer
+ * requirements for a particular caps. Use gst_query_unref() when done
+ * with it.
+ *
+ * Returns: A #GstQuery
+ */
+GstQuery *
+gst_query_new_buffers (GstCaps * caps)
+{
+ GstQuery *query;
+ GstStructure *structure;
+
+ /* XXX could add size here, for linear (non YUV/RGB) buffers? But I'm not
+ * entirely sure what is the use-case for that.. it should be easy enough
+ * to add more optional reply fields later
+ */
+ structure = gst_structure_id_new (GST_QUARK (QUERY_BUFFERS),
+ GST_QUARK (CAPS), GST_TYPE_CAPS, caps,
+ GST_QUARK (COUNT), G_TYPE_INT, -1,
+ GST_QUARK (WIDTH), G_TYPE_INT, -1,
+ GST_QUARK (HEIGHT), G_TYPE_INT, -1, NULL);
+
+ query = gst_query_new (GST_QUERY_BUFFERS, structure);
+
+ return query;
+}
+
+/**
+ * gst_query_set_buffers_count:
+ * @count: minimum number of buffers required
+ *
+ * Answer a buffers query by setting the minimum number of buffers required.
+ * If there is no minimum buffer count requirement, don't set this field in
+ * the query.
+ */
+void
+gst_query_set_buffers_count (GstQuery * query, gint count)
+{
+ GstStructure *structure;
+
+ g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERS);
+
+ structure = gst_query_get_structure (query);
+ gst_structure_id_set (structure, GST_QUARK (COUNT), G_TYPE_INT, count, NULL);
+}
+
+/**
+ * gst_query_set_buffers_dimensions:
+ * @width: minimum buffer width
+ * @height: minimum buffer height
+ *
+ * Answer a buffers query by setting the minimum buffer dimensions required.
+ * If there is no minimum buffer dimensions (beyond the width/height specified
+ * in the #GstCaps), don't set this field in the query.
+ */
+void
+gst_query_set_buffers_dimensions (GstQuery * query, gint width, gint height)
+{
+ GstStructure *structure;
+
+ g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERS);
+
+ structure = gst_query_get_structure (query);
+ gst_structure_id_set (structure,
+ GST_QUARK (WIDTH), G_TYPE_INT, width,
+ GST_QUARK (HEIGHT), G_TYPE_INT, height, NULL);
+}
+
+/**
+ * gst_query_parse_buffers_caps:
+ * @query: a #GstQuery
+ * @caps: the storage for the #GstCaps pointer, or NULL
+ *
+ * Parse a buffers query.
+ */
+void
+gst_query_parse_buffers_caps (GstQuery * query, const GstCaps ** caps)
+{
+ GstStructure *structure;
+
+ g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERS);
+
+ structure = gst_query_get_structure (query);
+ if (caps)
+ *caps = gst_value_get_caps (gst_structure_id_get_value (structure,
+ GST_QUARK (CAPS)));
+}
+
+/**
+ * gst_query_parse_buffers_count:
+ * @query: a #GstQuery
+ * @count: the storage for minimum number of buffers, or NULL
+ *
+ * Parse a buffers query answer to see the minimum number of buffers
+ * required. A returned value of -1 means there is no minimum requirement
+ */
+void
+gst_query_parse_buffers_count (GstQuery * query, gint * count)
+{
+ GstStructure *structure;
+
+ g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERS);
+
+ structure = gst_query_get_structure (query);
+ if (count)
+ *count = g_value_get_int (gst_structure_id_get_value (structure,
+ GST_QUARK (COUNT)));
+}
+
+/**
+ * gst_query_parse_buffers_dimensions:
+ * @query: a #GstQuery
+ * @width: the storage for minimum width, or NULL
+ * @height: the storage for minimum height, or NULL
+ *
+ * Parse a buffers query answer to see the minimum buffer dimensions required.
+ * A returned value of -1 for either dimension means there is no minimum
+ * requirement in that axis
+ */
+void
+gst_query_parse_buffers_dimensions (GstQuery * query, gint * width,
+ gint * height)
+{
+ GstStructure *structure;
+
+ g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERS);
+
+ structure = gst_query_get_structure (query);
+ if (width)
+ *width = g_value_get_int (gst_structure_id_get_value (structure,
+ GST_QUARK (WIDTH)));
+ if (height)
+ *height = g_value_get_int (gst_structure_id_get_value (structure,
+ GST_QUARK (HEIGHT)));
+}