From patchwork Mon Jun 29 13:47:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vinod Koul X-Patchwork-Id: 192285 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=-10.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, 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 1E5FBC433E0 for ; Mon, 29 Jun 2020 13:51:30 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9898D23D4D for ; Mon, 29 Jun 2020 13:51:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="vW5ZKjXq"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="l201X5wT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9898D23D4D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id DC9A284C; Mon, 29 Jun 2020 15:50:37 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz DC9A284C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1593438687; bh=0OCHxp2KnCTCXtsx1UXOGT2ygj5ktWr6M3PFjMMVoqw=; h=From:To:Subject:Date:In-Reply-To:References:Cc:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=vW5ZKjXqkdZMVOavGG02rjFCeXykpjiBuv7xFF5G9yyBkxDfiMCpUr4MpPQp//DMP 1EdjJ6tMa8MHHxsfaiuoz/9YVS9unuQphEBwekuCmt/FdlX4L5RGz455LAuD62RGAo /0oCH6rSTsQrIFncjHZHg79MutGwp/e3GmE/enPY= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id D2E93F8021D; Mon, 29 Jun 2020 15:49:45 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 7A24DF80268; Mon, 29 Jun 2020 15:48:04 +0200 (CEST) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id A23C5F8022B for ; Mon, 29 Jun 2020 15:47:58 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz A23C5F8022B Authentication-Results: alsa1.perex.cz; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="l201X5wT" Received: from localhost.localdomain (unknown [122.182.251.219]) (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 DB91E23D97; Mon, 29 Jun 2020 13:47:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593438477; bh=0OCHxp2KnCTCXtsx1UXOGT2ygj5ktWr6M3PFjMMVoqw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l201X5wTivo4ptCZQWRZ9vuc4FuXXcWSwmjcIg9j7JYMjIzAZgXv3aYqCpDRGyNZi eVFN152rI1WSYbIgnB0DnSp48HIua/grH+JEPa+fUoI97y+of7DrnhxmIsOI2HjTDV OIfyP81chRrF9XIv+lQ2WFUWp2FPpl3aNX8ORk2o= From: Vinod Koul To: Takashi Iwai , Jaroslav Kysela Subject: [PATCH v5 2/3] ALSA: compress: document the compress gapless audio state machine Date: Mon, 29 Jun 2020 19:17:36 +0530 Message-Id: <20200629134737.105993-3-vkoul@kernel.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200629134737.105993-1-vkoul@kernel.org> References: <20200629134737.105993-1-vkoul@kernel.org> MIME-Version: 1.0 Cc: alsa-devel@alsa-project.org, Charles Keepax , Pierre-Louis Bossart , linux-kernel@vger.kernel.org, Vinod Koul , Srinivas Kandagatla , =?utf-8?b?QW1hZGV1c3ogU8WCYXdpxYRz?= =?utf-8?q?ki?= X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" 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 ad89af9b31c9..935f325dbc77 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 =============