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ALSA: compress: document the compress gapless audio state machine 

Also documented the galpess transitions. Please note that these are not
really stream states, but show how the stream steps in gapless mode

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20200629134737.105993-3-vkoul@kernel.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Vinod Koul 2020-06-29 19:17:36 +05:30 committed by Takashi Iwai
parent 2441bf4dbc
commit d0af37c8ec
1 changed files with 32 additions and 0 deletions
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32
Documentation/sound/designs/compress-offload.rst
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@ -250,6 +250,38 @@ Sequence flow for gapless would be:
(note: order for partial_drain and write for next track can be reversed as well)
Gapless Playback SM
===================
For Gapless, we move from running state to partial drain and back, along
with setting of meta_data and signalling for next track ::
+----------+
compr_drain_notify() | |
+------------------------>| RUNNING |
| | |
| +----------+
| |
| |
| | compr_next_track()
| |
| V
| +----------+
| | |
| |NEXT_TRACK|
| | |
| +----------+
| |
| |
| | compr_partial_drain()
| |
| V
| +----------+
| | |
+------------------------ | PARTIAL_ |
| DRAIN |
+----------+
Not supported
=============