mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-13 12:51:16 +00:00
design: Fix typos, indentions, and assorted improvements. Delete
description of drain event
This commit is contained in:
parent
a7c41d6d3f
commit
8289d24aac
2 changed files with 27 additions and 49 deletions
|
@ -21,7 +21,7 @@ for this is that this way we can detect when the first buffer or event
|
|||
arrives in the sink when the state change completes.
|
||||
|
||||
A sink should block on the first `EOS` event or buffer received in the
|
||||
`READY→PAUSED` state before commiting the state to `PAUSED`.
|
||||
`READY→PAUSED` state before committing the state to `PAUSED`.
|
||||
|
||||
`FLUSHING` events have to be handled out of sync with the buffer flow and
|
||||
take no part in the preroll procedure.
|
||||
|
@ -42,9 +42,9 @@ Events other than `EOS` do not complete the preroll stage.
|
|||
switch (pending)
|
||||
case PLAYING:
|
||||
need_preroll = FALSE
|
||||
break
|
||||
break
|
||||
case PAUSED:
|
||||
break
|
||||
break
|
||||
case READY:
|
||||
case NULL:
|
||||
return FALSE
|
||||
|
@ -178,7 +178,7 @@ Events other than `EOS` do not complete the preroll stage.
|
|||
break
|
||||
SEGMENT:
|
||||
# the segment must be used to clip incoming
|
||||
# buffers. Then then go into the queue as non-prerollable
|
||||
# buffers. Then go into the queue as non-prerollable
|
||||
# items used for syncing the buffers
|
||||
STREAM_LOCK
|
||||
PREROLL_LOCK
|
||||
|
@ -234,50 +234,50 @@ Events other than `EOS` do not complete the preroll stage.
|
|||
READY_PAUSED:
|
||||
# no datapassing is going on so we always return ASYNC
|
||||
ret = ASYNC
|
||||
need_commit = TRUE
|
||||
need_commit = TRUE
|
||||
eos = FALSE
|
||||
flushing = FALSE
|
||||
need_preroll = TRUE
|
||||
prerolled = FALSE
|
||||
need_preroll = TRUE
|
||||
prerolled = FALSE
|
||||
break
|
||||
PAUSED_PLAYING:
|
||||
# we grab the preroll lock. This we can only do if the
|
||||
# chain function is either doing some clock sync, we are
|
||||
# waiting for preroll or the chain function is not being called.
|
||||
# chain function is either doing some clock sync, we are
|
||||
# waiting for preroll or the chain function is not being called.
|
||||
PREROLL_LOCK
|
||||
if (prerolled || eos)
|
||||
if (prerolled || eos)
|
||||
ret = OK
|
||||
need_commit = FALSE
|
||||
need_preroll = FALSE
|
||||
if (eos)
|
||||
post_eos
|
||||
else
|
||||
need_commit = FALSE
|
||||
need_preroll = FALSE
|
||||
if (eos)
|
||||
post_eos
|
||||
else
|
||||
PREROLL_SIGNAL
|
||||
else
|
||||
need_preroll = TRUE
|
||||
need_commit = TRUE
|
||||
else
|
||||
need_preroll = TRUE
|
||||
need_commit = TRUE
|
||||
ret = ASYNC
|
||||
PREROLL_UNLOCK
|
||||
break
|
||||
PLAYING_PAUSED:
|
||||
---> subclass can interrupt render
|
||||
# we grab the preroll lock. This we can only do if the
|
||||
# chain function is either doing some clock sync
|
||||
# or the chain function is not being called.
|
||||
# chain function is either doing some clock sync
|
||||
# or the chain function is not being called.
|
||||
PREROLL_LOCK
|
||||
need_preroll = TRUE
|
||||
need_preroll = TRUE
|
||||
unlock_clock
|
||||
if (prerolled || eos)
|
||||
if (prerolled || eos)
|
||||
ret = OK
|
||||
else
|
||||
else
|
||||
ret = ASYNC
|
||||
PREROLL_UNLOCK
|
||||
break
|
||||
PAUSED_READY:
|
||||
---> subclass can interrupt render
|
||||
# we grab the preroll lock. Set to flushing and unlock
|
||||
# everything. This should exit the chain functions and stop
|
||||
# streaming.
|
||||
# everything. This should exit the chain functions and stop
|
||||
# streaming.
|
||||
PREROLL_LOCK
|
||||
flushing = TRUE
|
||||
unlock_clock
|
||||
|
|
|
@ -14,7 +14,7 @@ Different types of events exist to implement various functionalities.
|
|||
* `GST_EVENT_CAPS`: Format information about the following buffers
|
||||
* `GST_EVENT_SEGMENT`: Timing information for the following buffers
|
||||
* `GST_EVENT_TAG`: Stream metadata.
|
||||
* `GST_EVENT_BUFFERSIZE`: Buffer size requirements
|
||||
* `GST_EVENT_BUFFERSIZE`: Buffer size requirements. Currently not used yet.
|
||||
* `GST_EVENT_SINK_MESSAGE`: An event turned into a message by sinks
|
||||
* `GST_EVENT_EOS`: no more data is to be expected on a pad.
|
||||
* `GST_EVENT_QOS`: A notification of the quality of service of the stream
|
||||
|
@ -24,10 +24,6 @@ Different types of events exist to implement various functionalities.
|
|||
* `GST_EVENT_STEP`: Stepping event
|
||||
* `GST_EVENT_RECONFIGURE`: stream reconfigure event
|
||||
|
||||
- `GST_EVENT_DRAIN`: Play all data downstream before returning.
|
||||
> not yet implemented, under investigation, might be needed to do
|
||||
still frames in DVD.
|
||||
|
||||
## src pads
|
||||
|
||||
A `gst_pad_push_event()` on a srcpad will first store the sticky event
|
||||
|
@ -44,7 +40,7 @@ A `gst_pad_send_event()` on a sinkpad will call the event function on
|
|||
the pad. If the event function returns success, the sticky event is
|
||||
stored in the sticky event array and the event is marked for update.
|
||||
|
||||
When the pad is flushing, the `_send_event()` function returns FALSE
|
||||
When the pad is flushing, the `gst_pad_send_event()` function returns FALSE
|
||||
immediately.
|
||||
|
||||
When the next data item is pushed, the pending events are pushed first.
|
||||
|
@ -178,7 +174,6 @@ tagging system. A tag is serialized with buffers.
|
|||
## BUFFERSIZE
|
||||
|
||||
> **Note**
|
||||
>
|
||||
> This event is not yet implemented.
|
||||
|
||||
An element can suggest a buffersize for downstream elements. This is
|
||||
|
@ -263,20 +258,3 @@ value is calculated by the pipeline and distributed to all sink elements
|
|||
before they are set to PLAYING. The sinks will add the configured
|
||||
latency value to the timestamps of the buffer in order to delay their
|
||||
presentation. (See also [latency](additional/design/latency.md)).
|
||||
|
||||
## DRAIN
|
||||
|
||||
> **Note**
|
||||
>
|
||||
> This event is not yet implemented.
|
||||
|
||||
Drain event indicates that upstream is about to perform a real-time
|
||||
event, such as pausing to present an interactive menu or such, and needs
|
||||
to wait for all data it has sent to be played-out in the sink.
|
||||
|
||||
Drain should only be used by live elements, as it may otherwise occur
|
||||
during prerolling.
|
||||
|
||||
Usually after draining the pipeline, an element either needs to modify
|
||||
timestamps, or FLUSH to prevent subsequent data being discarded at the
|
||||
sinks for arriving late (only applies during playback scenarios).
|
||||
|
|
Loading…
Reference in a new issue