From patchwork Mon Jun 22 06:58:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vinod Koul X-Patchwork-Id: 11617015 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5238A13A0 for ; Mon, 22 Jun 2020 06:58:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3832425441 for ; Mon, 22 Jun 2020 06:58:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592809117; bh=GqFAi7Q4sHYSuj6BAxMwU4DVplPmfDCh76OdL45s+EM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Cv33tZ9jzLQMJHwd1SePXaNaSB12aYImZbAWXZfrjmVuqhex5PNk63FFOaEJyxg+1 3VHuxkKbZ7Rdt1cz+Wrr75Eo3yMuMvQ1UgKcMbFzV2VSK7C9skbX8fx2QyBKJQnBOi GfclZnBocHWP0bVToRDDXAR93esCOUweZ7roOWzU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731303AbgFVG6g (ORCPT ); Mon, 22 Jun 2020 02:58:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:43806 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725933AbgFVG6g (ORCPT ); Mon, 22 Jun 2020 02:58:36 -0400 Received: from localhost.localdomain (unknown [171.61.66.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9D6E42543C; Mon, 22 Jun 2020 06:58:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592809115; bh=GqFAi7Q4sHYSuj6BAxMwU4DVplPmfDCh76OdL45s+EM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XUubVqh7SwrB1MbftvIpwdhMm7y6KHzJxeFvVNTH/tD6Xxo5XFxARiUaBkZM8W1kz r50RblSeNtI1MSjlbdZWVJ4r6EGHDEE4S8YxivgVlaOwL0dE1m6u9AM9MRE19IlpgE 7T81WWPH0+y6mERjA2wlJwJ3tM4TTSV9pa3hQ3rI= From: Vinod Koul To: Takashi Iwai , Jaroslav Kysela Cc: linux-arm-msm@vger.kernel.org, Bjorn Andersson , Vinod Koul , Srinivas Kandagatla , Pierre-Louis Bossart , Charles Keepax , alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/3] ALSA: compress: document the compress gapless audio state machine Date: Mon, 22 Jun 2020 12:28:10 +0530 Message-Id: <20200622065811.221485-3-vkoul@kernel.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200622065811.221485-1-vkoul@kernel.org> References: <20200622065811.221485-1-vkoul@kernel.org> MIME-Version: 1.0 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.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 --- .../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 =============