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Date: Mon, 22 Jun 2020 12:28:10 +0530 From: Vinod Koul <vkoul@...nel.org> To: Takashi Iwai <tiwai@...e.com>, Jaroslav Kysela <perex@...ex.cz> Cc: linux-arm-msm@...r.kernel.org, Bjorn Andersson <bjorn.andersson@...aro.org>, Vinod Koul <vkoul@...nel.org>, Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>, Charles Keepax <ckeepax@...nsource.cirrus.com>, alsa-devel@...a-project.org, linux-kernel@...r.kernel.org Subject: [PATCH v2 2/3] 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@...nel.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 6f86db82298b..0bebfd33b933 100644 --- a/Documentation/sound/designs/compress-offload.rst +++ b/Documentation/sound/designs/compress-offload.rst @@ -251,6 +251,38 @@ 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
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