[v5,1/3] ALSA: compress: document the compress audio state machine
diff mbox series

Message ID 20200629134737.105993-2-vkoul@kernel.org
State New
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Series
  • ALSA: compress: Document stream states and fix gapless SM
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Commit Message

Vinod Koul June 29, 2020, 1:47 p.m. UTC
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>
---
 .../sound/designs/compress-offload.rst        | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)

Comments

Takashi Iwai July 7, 2020, 9:54 a.m. UTC | #1
On Mon, 29 Jun 2020 15:47:35 +0200,
Vinod Koul wrote:
> 
> 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>

Applied to for-next branch now.  Thanks.


Takashi

Patch
diff mbox series

diff --git a/Documentation/sound/designs/compress-offload.rst b/Documentation/sound/designs/compress-offload.rst
index ad4bfbdacc83..ad89af9b31c9 100644
--- a/Documentation/sound/designs/compress-offload.rst
+++ b/Documentation/sound/designs/compress-offload.rst
@@ -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
 ================