From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6D2C7C433DF for ; Fri, 19 Jun 2020 04:55:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C467214D8 for ; Fri, 19 Jun 2020 04:55:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592542518; bh=xsXYmu5KJaRlZUfPJ9GfJ5BsD+GGZhZMq6RqGkubP44=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=a36twUgZlK1/ECqZW1Er3agrs09FLyQYl2hP5ffJ6CtSTxIwW2GDvzk9SmIAy2X4Y Jl7FnIy6NcXiGE72em98/H1G46vTtwTrdK9Sp6tyc9bi44T6mDAdvd1fRXKpwrhTg5 qo4m0IG9ZUp8Y/n8uvbMHnPrvr1vA8PSP67Leaoo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727981AbgFSEzM (ORCPT ); Fri, 19 Jun 2020 00:55:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:58200 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727883AbgFSEzJ (ORCPT ); Fri, 19 Jun 2020 00:55:09 -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 8AE2420CC7; Fri, 19 Jun 2020 04:55:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592542509; bh=xsXYmu5KJaRlZUfPJ9GfJ5BsD+GGZhZMq6RqGkubP44=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XWaR+4Dl9B4lEGH3LA86yfWN3WtZHxRrvSzeZL19EwYgVM8KWonOpvVr7U4RbDGHg x2NjlW9LOLlYlti68KducJiUZSrzJWRlJWO13hzCvjPHz7iSgabN74FHaPkpNrLatS O3ESbCIrPQl1Bft1FVqoABlkVpCHY73tERAnoA/w= From: Vinod Koul To: Takashi Iwai , Jaroslav Kysela Cc: Vinod Koul , Pierre-Louis Bossart , Charles Keepax , alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/3] ALSA: compress: document the compress gapless audio state machine Date: Fri, 19 Jun 2020 10:24:47 +0530 Message-Id: <20200619045449.3966868-3-vkoul@kernel.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200619045449.3966868-1-vkoul@kernel.org> References: <20200619045449.3966868-1-vkoul@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 7292717c43bf..3e241530e173 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