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ALSA: compress: document the compress gapless audio state machine

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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>
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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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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
=============