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design: update stream-status document some more

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Wim Taymans 2009-04-21 09:45:08 +02:00 committed by Wim Taymans
parent 0b5f070eae
commit 39aa1e0e31
1 changed files with 26 additions and 6 deletions
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32
docs/design/draft-stream-status.txt
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@ -11,8 +11,11 @@ the threadpool to use.
We accomodate for the following requirements:
- Application is informed when a streaming thread is about to be created.
- Application is informed when a streaming thread is about to be created. It
should be possible for the application to suggest a custom GstTask.
- Application is informed when the status of a streaming thread is changed.
This can be interesting for GUI application that want to visualize the status
of the streaming threads (playing/paused/stopped)
- Application is informed when a streaming thread is destroyed.
We allow for the following scenarios:
@ -59,17 +62,21 @@ Messages
(selected) elements. The following fields will be contained in the message:
- "status", GST_TYPE_STREAM_STATUS_TYPE
- a set of types to control the lifecycle of the thread:
GST_STREAM_STATUS_TYPE_CREATE: a new streaming thread is going to be
created. The application has the chance to configure a custom thread.
GST_STREAM_STATUS_TYPE_ENTER: the streaming thread is about to enter its
loop function for the first time.
GST_STREAM_STATUS_TYPE_START: a streaming thread is started
GST_STREAM_STATUS_TYPE_PAUSE: a streaming thread is paused
GST_STREAM_STATUS_TYPE_STOP: a streaming thread is stopped
GST_STREAM_STATUS_TYPE_LEAVE: the streaming thread is about to leave its
loop.
GST_STREAM_STATUS_TYPE_DESTROY: a streaming thread is destroyed
- A set of types to control the state of the threads:
GST_STREAM_STATUS_TYPE_START: a streaming thread is started
GST_STREAM_STATUS_TYPE_PAUSE: a streaming thread is paused
GST_STREAM_STATUS_TYPE_STOP: a streaming thread is stopped
- "thread-object-type", GST_TYPE_THREAD_OBJECT
The type of object used for controlling the streaming thread.
GST_STREAM_THREAD_TASK: thread-object contains a GstTask object
@ -81,10 +88,23 @@ Messages
A GstTask/GThread controlling this streaming thread. This can be NULL when
the object controlling the streaming thread is not yet created.
- "owner", GST_TYPE_ELEMENT
The owner element of the thread. The message source will contain the pad
(or one of the pads) that will produce data by this thread. If this thread
does not produce data on a pad, the message source will contain the owner
as well. The idea is that the application should be able to see from the
element/pad what function this thread has in the context of the
application and configure the thread appropriatly.
- "flow-return", GstFlowReturn
a status code for why the thread state changed. when threads are created
A status code for why the thread state changed. when threads are created
and started, this is usually GST_FLOW_OK but when they are stopping it
contains the reason why it stopped.
contains the reason code why it stopped.
- "reason", G_TYPE_STRING
A string describing the reason why the thread started/stopped/paused.
Can be NULL if no reason is given.
Events