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ALSA: compress: document the compress audio state machine

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So we had some discussions of the stream states, so I thought it is a
good idea to document the state transitions, so add it documentation

Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20200629134737.105993-2-vkoul@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Vinod Koul 2020-06-29 19:17:35 +05:30 committed by Takashi Iwai
parent d777587150
commit 2441bf4dbc
1 changed files with 51 additions and 0 deletions
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51
Documentation/sound/designs/compress-offload.rst
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@ -151,6 +151,57 @@ Modifications include:
- Addition of encoding options when required (derived from OpenMAX IL)
- Addition of rateControlSupported (missing in OpenMAX AL)
State Machine
=============
The compressed audio stream state machine is described below ::
+----------+
| |
| OPEN |
| |
+----------+
|
|
| compr_set_params()
|
v
compr_free() +----------+
+------------------------------------| |
| | SETUP |
| +-------------------------| |<-------------------------+
| | compr_write() +----------+ |
| | ^ |
| | | compr_drain_notify() |
| | | or |
| | | compr_stop() |
| | | |
| | +----------+ |
| | | | |
| | | DRAIN | |
| | | | |
| | +----------+ |
| | ^ |
| | | |
| | | compr_drain() |
| | | |
| v | |
| +----------+ +----------+ |
| | | compr_start() | | compr_stop() |
| | PREPARE |------------------->| RUNNING |--------------------------+
| | | | | |
| +----------+ +----------+ |
| | | ^ |
| |compr_free() | | |
| | compr_pause() | | compr_resume() |
| | | | |
| v v | |
| +----------+ +----------+ |
| | | | | compr_stop() |
+--->| FREE | | PAUSE |---------------------------+
| | | |
+----------+ +----------+
Gapless Playback
================