[Bug 572973] [API] buffer size query or indication from audio encoders to upstream how many samples to produce per buffer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=572973

--- Comment #17 from Stefan Sauer (gstreamer, gtkdoc dev) <ensonic at sonicpulse.de> ---
Nicolas, can you please give an example how you would do it with the api we
have?

The source creates and sends an allocation query:
query = gst_query_new_allocation(some_caps, FALSE);
gst_pad_peer_query (self->srcpad, query);

Now the decoder get those and wants to tell what buffer-size is preferred. The
available API is:

gst_query_add_allocation_meta (GstQuery *query,
                               GType api,
                               const GstStructure *params);
gst_query_add_allocation_param (GstQuery *query,
                                GstAllocator *allocator,
                                const GstAllocationParams *params);
gst_query_add_allocation_pool (GstQuery *query,
                               GstBufferPool *pool,
                               guint size,
                               guint min_buffers,
                               guint max_buffers);

What I am saying is that using:
gst_query_add_allocation_pool (query, NULL, preferred_size, 0, 0);
sound like a hack to me (even though pool=NULL is allowed). I am mostly
concerned that it won't be very discoverable, since the the api name suggest
that we configure a pool.

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