From: Vinod Koul <vkoul@kernel.org>
To: Takashi Iwai <tiwai@suse.com>, Jaroslav Kysela <perex@perex.cz>
Cc: Vinod Koul <vkoul@kernel.org>,
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
Charles Keepax <ckeepax@opensource.cirrus.com>,
alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 2/3] ALSA: compress: document the compress gapless audio state machine
Date: Thu, 25 Jun 2020 21:16:50 +0530 [thread overview]
Message-ID: <20200625154651.99758-3-vkoul@kernel.org> (raw)
In-Reply-To: <20200625154651.99758-1-vkoul@kernel.org>
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>
---
.../sound/designs/compress-offload.rst | 32 +++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/Documentation/sound/designs/compress-offload.rst b/Documentation/sound/designs/compress-offload.rst
index b6e9025ae105..82950dbbc4a9 100644
--- a/Documentation/sound/designs/compress-offload.rst
+++ b/Documentation/sound/designs/compress-offload.rst
@@ -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
=============
--
2.26.2
next prev parent reply other threads:[~2020-06-25 15:47 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-25 15:46 [PATCH v3 0/3] ALSA: compress: Document stream states and fix gapless SM Vinod Koul
2020-06-25 15:46 ` [PATCH v3 1/3] ALSA: compress: document the compress audio state machine Vinod Koul
2020-06-26 10:45 ` Charles Keepax
2020-06-25 15:46 ` Vinod Koul [this message]
2020-06-25 15:46 ` [PATCH v3 3/3] ALSA: compress: fix partial_drain completion state Vinod Koul
2020-06-26 10:35 ` Charles Keepax
2020-06-29 5:16 ` Vinod Koul
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