[0.11] gstreamer: docs: update controller design doc

Stefan Kost ensonic at kemper.freedesktop.org
Sun Jan 1 12:00:01 PST 2012


Module: gstreamer
Branch: 0.11
Commit: 5668654ed5fe0779e7067efc1f7769542dfff7e3
URL:    http://cgit.freedesktop.org/gstreamer/gstreamer/commit/?id=5668654ed5fe0779e7067efc1f7769542dfff7e3

Author: Stefan Sauer <ensonic at users.sf.net>
Date:   Sun Jan  1 20:59:22 2012 +0100

docs: update controller design doc

---

 docs/design/part-controller.txt |   17 +++++++++++++++--
 1 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/docs/design/part-controller.txt b/docs/design/part-controller.txt
index 6817b0d..c75da54 100644
--- a/docs/design/part-controller.txt
+++ b/docs/design/part-controller.txt
@@ -12,12 +12,25 @@ Elements don't need to do much. They need to:
   GST_PARAM_CONTROLLABLE
 - call gst_object_sync_values (self, timestamp) in the processing function
   before accessing the parameters.
+  
+All ordered property types can be automated (int, double, boolean, enum). 
 
 Application view
 ~~~~~~~~~~~~~~~~
-Application need to setup the property automation. For that they need to create
+Applications need to setup the property automation. For that they need to create
 a GstControlSource and attach it to a property using GstControlBinding. Various
-control-sources and control-bindings exists. All control sources produce control
+control-sources and control-bindings exist. All control sources produce control
 value sequences in the form of gdouble values. The control bindings map them to
 the value range and type of the bound property.
 
+One control-source can be attached to one or more properties at the same time.
+If it is attached multiple times, then each control-binding will scale and
+convert the control values to the target property type and range.
+
+One can create complex control-curves by using a GstInterpolationControlSource.
+This allows the classic user editable control-curve (often seen in audio/video
+editors). Another way is to use computed control curves. GstLFOControlSource can
+generate various repetitive signals. Those can be made more complex by chaining
+the control sources. One can attach another control-source to e.g. modulate the
+frequency of the first GstLFOControlSource.
+



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