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Diffstat (limited to 'docs/design/part-query.txt')
| -rw-r--r-- | docs/design/part-query.txt | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/docs/design/part-query.txt b/docs/design/part-query.txt index bce78564b6..4973c21cc3 100644 --- a/docs/design/part-query.txt +++ b/docs/design/part-query.txt @@ -1,12 +1,16 @@ -DRAFT Query ------------ +Query +----- + +NOTE: this is implemented as proposed Purpose +~~~~~~~ - Queries are used to get information about the stream. - A query is started on a specific pad and travels up or downstream. +Queries are used to get information about the stream. +A query is started on a specific pad and travels up or downstream. Types of queries +~~~~~~~~~~~~~~~~ - get length of stream - get position in stream @@ -17,6 +21,7 @@ Types of queries - query internal links. Current implementation +~~~~~~~~~~~~~~~~~~~~~~ The current implementation of query requires pads to implement the following functions: @@ -36,12 +41,14 @@ Current implementation Requirements +~~~~~~~~~~~~ - multiple return values, grouped together when they make sense. - one pad function to perform the query - extensible queries. Proposition +~~~~~~~~~~~ - define GstQuery extending GstMiniObject and containing a GstStructure (see GstMessage) - define standard query types (see proposed types) @@ -54,6 +61,7 @@ Proposition query is not supported. Proposed types +~~~~~~~~~~~~~~ - GST_QUERY_SEEKING: |