From patchwork Sun Sep 20 17:17:22 2020 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: 1367947 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=t-online.de 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 ozlabs.org (Postfix) with ESMTPS id 4BvZ9y1pHGz9sTC for ; Mon, 21 Sep 2020 03:21:40 +1000 (AEST) Received: from localhost ([::1]:51962 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kK31r-0007TN-Ur for incoming@patchwork.ozlabs.org; Sun, 20 Sep 2020 13:21:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44230) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kK2y8-00041R-3o for qemu-devel@nongnu.org; Sun, 20 Sep 2020 13:17:45 -0400 Received: from mailout11.t-online.de ([194.25.134.85]:50978) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kK2y3-0006Fi-OY for qemu-devel@nongnu.org; Sun, 20 Sep 2020 13:17:43 -0400 Received: from fwd23.aul.t-online.de (fwd23.aul.t-online.de [172.20.26.128]) by mailout11.t-online.de (Postfix) with SMTP id 110024227A3A; Sun, 20 Sep 2020 19:17:38 +0200 (CEST) Received: from linpower.localnet (S+TPB6ZF8hyTWgWKs8RTEDB-qWhNOH3J1Hr3QLR2XNsvOS2Z0-rYyYW6LGiJ1CcQHH@[93.236.144.216]) by fwd23.t-online.de with (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384 encrypted) esmtp id 1kK2xx-1mxmc40; Sun, 20 Sep 2020 19:17:33 +0200 Received: by linpower.localnet (Postfix, from userid 1000) id EE572200618; Sun, 20 Sep 2020 19:17:29 +0200 (CEST) From: =?utf-8?q?Volker_R=C3=BCmelin?= To: Gerd Hoffmann Subject: [PATCH 2/9] audio/audio: fix video playback slowdown with spiceaudio Date: Sun, 20 Sep 2020 19:17:22 +0200 Message-Id: <20200920171729.15861-2-vr_qemu@t-online.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <84f1c61a-8399-c75e-96c2-febfc2dd5fab@t-online.de> References: <84f1c61a-8399-c75e-96c2-febfc2dd5fab@t-online.de> MIME-Version: 1.0 X-ID: S+TPB6ZF8hyTWgWKs8RTEDB-qWhNOH3J1Hr3QLR2XNsvOS2Z0-rYyYW6LGiJ1CcQHH X-TOI-EXPURGATEID: 150726::1600622253-00017F06-698604E3/0/0 CLEAN NORMAL X-TOI-MSGID: c6469676-489e-4bdc-8004-1bcce84d763c Received-SPF: none client-ip=194.25.134.85; envelope-from=volker.ruemelin@t-online.de; helo=mailout11.t-online.de X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/20 13:17:31 X-ACL-Warn: Detected OS = Linux 3.11 and newer [fuzzy] X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel , =?utf-8?b?Wm9sdMOhbiBLxZF2w6Fnw7M=?= Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch allows the audio backends get_buffer_out() functions to drop audio data and mitigates a bug reported on the qemu-devel mailing list. https://lists.nongnu.org/archive/html/qemu-devel/2020-09/msg03832.html The new rules for the variables buf and size returned by get_buffer_out() are: size == 0: Downstream playback buffer is full. Retry later. size > 0, buf != NULL: Copy size bytes to buf for playback. size > 0, buf == NULL: Drop size bytes. The audio playback rate with spiceaudio for the no audio case is too fast, but that's what we had before commit fb35c2cec5 "audio/dsound: fix invalid parameters error". The complete fix comes with the next patch. Reported-by: Qi Zhou Signed-off-by: Volker Rümelin --- audio/audio.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/audio/audio.c b/audio/audio.c index ce8c6dec5f..ad3f57b4c4 100644 --- a/audio/audio.c +++ b/audio/audio.c @@ -1091,12 +1091,15 @@ static size_t audio_pcm_hw_run_out(HWVoiceOut *hw, size_t live) while (live) { size_t size, decr, proc; void *buf = hw->pcm_ops->get_buffer_out(hw, &size); - if (!buf || size == 0) { + + if (size == 0) { break; } decr = MIN(size / hw->info.bytes_per_frame, live); - audio_pcm_hw_clip_out(hw, buf, decr); + if (buf) { + audio_pcm_hw_clip_out(hw, buf, decr); + } proc = hw->pcm_ops->put_buffer_out(hw, buf, decr * hw->info.bytes_per_frame) / hw->info.bytes_per_frame;