From patchwork Sat Jan 21 09:47:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Volker_R=C3=BCmelin?= X-Patchwork-Id: 13111039 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4C783C38141 for ; Sat, 21 Jan 2023 09:49:31 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pJATr-0006h4-GP; Sat, 21 Jan 2023 04:48:11 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pJATg-0006ep-Oe for qemu-devel@nongnu.org; Sat, 21 Jan 2023 04:48:01 -0500 Received: from mailout08.t-online.de ([194.25.134.20]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pJATe-00039w-Va for qemu-devel@nongnu.org; Sat, 21 Jan 2023 04:48:00 -0500 Received: from fwd85.dcpf.telekom.de (fwd85.aul.t-online.de [10.223.144.111]) by mailout08.t-online.de (Postfix) with SMTP id 927FB493D; Sat, 21 Jan 2023 10:47:57 +0100 (CET) Received: from linpower.localnet ([79.208.25.151]) by fwd85.t-online.de with (TLSv1.3:TLS_AES_256_GCM_SHA384 encrypted) esmtp id 1pJATd-2MjW3F0; Sat, 21 Jan 2023 10:47:57 +0100 Received: by linpower.localnet (Postfix, from userid 1000) id 52EAC2006E7; Sat, 21 Jan 2023 10:47:35 +0100 (CET) From: =?utf-8?q?Volker_R=C3=BCmelin?= To: Gerd Hoffmann Cc: Christian Schoenebeck , Thomas Huth , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Richard Henderson , =?utf-8?q?Daniel_P_=2E_Be?= =?utf-8?q?rrang=C3=A9?= , qemu-devel@nongnu.org Subject: [PATCH v2 10/11] alsaaudio: change default playback settings Date: Sat, 21 Jan 2023 10:47:34 +0100 Message-Id: <20230121094735.11644-10-vr_qemu@t-online.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <0a4007dc-e11c-f16e-0e21-dbc4e60caa59@t-online.de> References: <0a4007dc-e11c-f16e-0e21-dbc4e60caa59@t-online.de> MIME-Version: 1.0 X-TOI-EXPURGATEID: 150726::1674294477-ABFF3DFF-DB886478/0/0 CLEAN NORMAL X-TOI-MSGID: 7363a95b-47c9-4380-90f0-e9510398da10 Received-SPF: none client-ip=194.25.134.20; envelope-from=volker.ruemelin@t-online.de; helo=mailout08.t-online.de X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org The currently used default playback settings in the ALSA audio backend are a bit unfortunate. With a few emulated audio devices, audio playback does not work properly. Here is a short part of the debug log while audio is playing (elapsed time in seconds). audio: Elapsed since last alsa run (running): 0.046244 audio: Elapsed since last alsa run (running): 0.023137 audio: Elapsed since last alsa run (running): 0.023170 audio: Elapsed since last alsa run (running): 0.023650 audio: Elapsed since last alsa run (running): 0.060802 audio: Elapsed since last alsa run (running): 0.031931 For some audio devices the time of more than 23ms between updates is too long. Set the period time to 5.8ms so that the maximum time between two updates typically does not exceed 11ms. This roughly matches the 10ms period time when doing playback with the audio timer. After this patch the debug log looks like this. audio: Elapsed since last alsa run (running): 0.011919 audio: Elapsed since last alsa run (running): 0.005788 audio: Elapsed since last alsa run (running): 0.005995 audio: Elapsed since last alsa run (running): 0.011069 audio: Elapsed since last alsa run (running): 0.005901 audio: Elapsed since last alsa run (running): 0.006084 Acked-by: Christian Schoenebeck Signed-off-by: Volker Rümelin --- audio/alsaaudio.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/audio/alsaaudio.c b/audio/alsaaudio.c index 5f50dfa0bf..0cc982e61f 100644 --- a/audio/alsaaudio.c +++ b/audio/alsaaudio.c @@ -913,17 +913,14 @@ static void *alsa_audio_init(Audiodev *dev) alsa_init_per_direction(aopts->in); alsa_init_per_direction(aopts->out); - /* - * need to define them, as otherwise alsa produces no sound - * doesn't set has_* so alsa_open can identify it wasn't set by the user - */ + /* don't set has_* so alsa_open can identify it wasn't set by the user */ if (!dev->u.alsa.out->has_period_length) { - /* 1024 frames assuming 44100Hz */ - dev->u.alsa.out->period_length = 1024 * 1000000 / 44100; + /* 256 frames assuming 44100Hz */ + dev->u.alsa.out->period_length = 5805; } if (!dev->u.alsa.out->has_buffer_length) { /* 4096 frames assuming 44100Hz */ - dev->u.alsa.out->buffer_length = 4096ll * 1000000 / 44100; + dev->u.alsa.out->buffer_length = 92880; } /*