From patchwork Fri May 5 15:52:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oswald Buddenhagen X-Patchwork-Id: 13232802 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 81AD8C77B75 for ; Fri, 5 May 2023 15:54:08 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 1CAC32D51; Fri, 5 May 2023 17:53:15 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 1CAC32D51 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1683302045; bh=mh7VCDQhud3R8uYpBhoW9Nh5IYrIP5wu374/xSGx6is=; h=From:To:Subject:Date:CC:List-Id:List-Archive:List-Help:List-Owner: List-Post:List-Subscribe:List-Unsubscribe:From; b=XigIkdb0afxdYfkQV6kL/xrlYnzpcSmE+TEfXiYt5Oko25rCLqgHLrEvOb2AshWdc FTWFaouefurcXQ9Rvo7oD2Zed0+on2p2gzQEYPvJigFx21vfSqbwWoov5tmxQmgxtO x91LUUthCHU3zfIivVr6yIb+F0+ta0RJqOG3Mnkw= Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id 995D2F80534; Fri, 5 May 2023 17:52:55 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 06ED4F80551; Fri, 5 May 2023 17:52:52 +0200 (CEST) Received: from bluemchen.kde.org (bluemchen.kde.org [209.51.188.41]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 624C5F80533 for ; Fri, 5 May 2023 17:52:46 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 624C5F80533 Received: from ugly.fritz.box (localhost [127.0.0.1]) by bluemchen.kde.org (Postfix) with ESMTP id 406FD202CD; Fri, 5 May 2023 11:52:45 -0400 (EDT) Received: by ugly.fritz.box (masqmail 0.3.4, from userid 1000) id 1puxjh-hVm-00; Fri, 05 May 2023 17:52:45 +0200 From: Oswald Buddenhagen To: alsa-devel@alsa-project.org Subject: [PATCH v2 1/7] ALSA: pcm: Revert "ALSA: pcm: rewrite snd_pcm_playback_silence()" Date: Fri, 5 May 2023 17:52:38 +0200 Message-Id: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> X-Mailer: git-send-email 2.40.0.152.g15d061e6df MIME-Version: 1.0 Message-ID-Hash: TRLUJRLKO7EI6WFNJEGSGYVXP665RAPL X-Message-ID-Hash: TRLUJRLKO7EI6WFNJEGSGYVXP665RAPL X-MailFrom: ossi@kde.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Takashi Iwai , Jeff Chua X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Jaroslav Kysela This reverts commit 9f656705c5faa18afb26d922cfc64f9fd103c38d. There was a regression (in the top-up mode). Unfortunately, the patch provided from the author of this commit is not easy to review. Keep the updated and new comments in headers. Also add a new comment that documents the missed API constraint which led to the regression. Reported-by: Jeff Chua Link: https://lore.kernel.org/r/CAAJw_ZsbTVd3Es373x_wTNDF7RknGhCD0r+NKUSwAO7HpLAkYA@mail.gmail.com Signed-off-by: Jaroslav Kysela Signed-off-by: Oswald Buddenhagen --- v2: - add docu comment - commit message improvements --- sound/core/pcm_lib.c | 90 ++++++++++++++++++++++++----------------- sound/core/pcm_local.h | 3 +- sound/core/pcm_native.c | 6 +-- 3 files changed, 59 insertions(+), 40 deletions(-) diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index d21c73944efd..3357ffae635f 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -42,56 +42,74 @@ static int fill_silence_frames(struct snd_pcm_substream *substream, * * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately */ -void snd_pcm_playback_silence(struct snd_pcm_substream *substream) +void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr) { struct snd_pcm_runtime *runtime = substream->runtime; - snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr); - snd_pcm_sframes_t added, hw_avail, frames; - snd_pcm_uframes_t noise_dist, ofs, transfer; + snd_pcm_uframes_t frames, ofs, transfer; int err; - added = appl_ptr - runtime->silence_start; - if (added) { - if (added < 0) - added += runtime->boundary; - if (added < runtime->silence_filled) - runtime->silence_filled -= added; - else - runtime->silence_filled = 0; - runtime->silence_start = appl_ptr; - } - - // This will "legitimately" turn negative on underrun, and will be mangled - // into a huge number by the boundary crossing handling. The initial state - // might also be not quite sane. The code below MUST account for these cases. - hw_avail = appl_ptr - runtime->status->hw_ptr; - if (hw_avail < 0) - hw_avail += runtime->boundary; - - noise_dist = hw_avail + runtime->silence_filled; if (runtime->silence_size < runtime->boundary) { - frames = runtime->silence_threshold - noise_dist; - if (frames <= 0) + snd_pcm_sframes_t noise_dist, n; + snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr); + if (runtime->silence_start != appl_ptr) { + n = appl_ptr - runtime->silence_start; + if (n < 0) + n += runtime->boundary; + if ((snd_pcm_uframes_t)n < runtime->silence_filled) + runtime->silence_filled -= n; + else + runtime->silence_filled = 0; + runtime->silence_start = appl_ptr; + } + if (runtime->silence_filled >= runtime->buffer_size) return; + noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled; + if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold) + return; + frames = runtime->silence_threshold - noise_dist; if (frames > runtime->silence_size) frames = runtime->silence_size; } else { - frames = runtime->buffer_size - noise_dist; - if (frames <= 0) - return; + /* + * This filling mode aims at free-running mode (used for example by dmix), + * which doesn't update the application pointer. + */ + if (new_hw_ptr == ULONG_MAX) { /* initialization */ + snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime); + if (avail > runtime->buffer_size) + avail = runtime->buffer_size; + runtime->silence_filled = avail > 0 ? avail : 0; + runtime->silence_start = (runtime->status->hw_ptr + + runtime->silence_filled) % + runtime->boundary; + } else { + ofs = runtime->status->hw_ptr; + frames = new_hw_ptr - ofs; + if ((snd_pcm_sframes_t)frames < 0) + frames += runtime->boundary; + runtime->silence_filled -= frames; + if ((snd_pcm_sframes_t)runtime->silence_filled < 0) { + runtime->silence_filled = 0; + runtime->silence_start = new_hw_ptr; + } else { + runtime->silence_start = ofs; + } + } + frames = runtime->buffer_size - runtime->silence_filled; } - if (snd_BUG_ON(frames > runtime->buffer_size)) return; - ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size; - do { + if (frames == 0) + return; + ofs = runtime->silence_start % runtime->buffer_size; + while (frames > 0) { transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames; err = fill_silence_frames(substream, ofs, transfer); snd_BUG_ON(err < 0); runtime->silence_filled += transfer; frames -= transfer; ofs = 0; - } while (frames > 0); + } snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); } @@ -425,6 +443,10 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream, return 0; } + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && + runtime->silence_size > 0) + snd_pcm_playback_silence(substream, new_hw_ptr); + if (in_interrupt) { delta = new_hw_ptr - runtime->hw_ptr_interrupt; if (delta < 0) @@ -442,10 +464,6 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream, runtime->hw_ptr_wrap += runtime->boundary; } - if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && - runtime->silence_size > 0) - snd_pcm_playback_silence(substream); - update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp); return snd_pcm_update_state(substream, runtime); diff --git a/sound/core/pcm_local.h b/sound/core/pcm_local.h index 42fe3a4e9154..ecb21697ae3a 100644 --- a/sound/core/pcm_local.h +++ b/sound/core/pcm_local.h @@ -29,7 +29,8 @@ int snd_pcm_update_state(struct snd_pcm_substream *substream, struct snd_pcm_runtime *runtime); int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream); -void snd_pcm_playback_silence(struct snd_pcm_substream *substream); +void snd_pcm_playback_silence(struct snd_pcm_substream *substream, + snd_pcm_uframes_t new_hw_ptr); static inline snd_pcm_uframes_t snd_pcm_avail(struct snd_pcm_substream *substream) diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index 3d0c4a5b701b..94185267a7b9 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -958,7 +958,7 @@ static int snd_pcm_sw_params(struct snd_pcm_substream *substream, if (snd_pcm_running(substream)) { if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && runtime->silence_size > 0) - snd_pcm_playback_silence(substream); + snd_pcm_playback_silence(substream, ULONG_MAX); err = snd_pcm_update_state(substream, runtime); } snd_pcm_stream_unlock_irq(substream); @@ -1455,7 +1455,7 @@ static void snd_pcm_post_start(struct snd_pcm_substream *substream, __snd_pcm_set_state(runtime, state); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && runtime->silence_size > 0) - snd_pcm_playback_silence(substream); + snd_pcm_playback_silence(substream, ULONG_MAX); snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); } @@ -1916,7 +1916,7 @@ static void snd_pcm_post_reset(struct snd_pcm_substream *substream, runtime->control->appl_ptr = runtime->status->hw_ptr; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && runtime->silence_size > 0) - snd_pcm_playback_silence(substream); + snd_pcm_playback_silence(substream, ULONG_MAX); snd_pcm_stream_unlock_irq(substream); } From patchwork Fri May 5 15:52:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oswald Buddenhagen X-Patchwork-Id: 13232816 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 01B21C77B75 for ; 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Fri, 5 May 2023 17:53:00 +0200 (CEST) Received: from bluemchen.kde.org (bluemchen.kde.org [209.51.188.41]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 9683BF8053B for ; Fri, 5 May 2023 17:52:46 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 9683BF8053B Received: from ugly.fritz.box (localhost [127.0.0.1]) by bluemchen.kde.org (Postfix) with ESMTP id 4281D2038E; Fri, 5 May 2023 11:52:45 -0400 (EDT) Received: by ugly.fritz.box (masqmail 0.3.4, from userid 1000) id 1puxjh-hVs-00; Fri, 05 May 2023 17:52:45 +0200 From: Oswald Buddenhagen To: alsa-devel@alsa-project.org Subject: [PATCH v2 2/7] ALSA: pcm: fix playback silence - use the actual new_hw_ptr for the threshold mode Date: Fri, 5 May 2023 17:52:39 +0200 Message-Id: <20230505155244.2312199-2-oswald.buddenhagen@gmx.de> X-Mailer: git-send-email 2.40.0.152.g15d061e6df In-Reply-To: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> References: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> MIME-Version: 1.0 Message-ID-Hash: 52KJFPWFBSNALGAU2KWRZAQRXDZXO57E X-Message-ID-Hash: 52KJFPWFBSNALGAU2KWRZAQRXDZXO57E X-MailFrom: ossi@kde.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Takashi Iwai X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Jaroslav Kysela The snd_pcm_playback_hw_avail() function uses runtime->status->hw_ptr. Unfortunately, in case when we call this function from snd_pcm_update_hw_ptr0(), this variable contains the previous hardware pointer. Use the new_hw_ptr argument to calculate hw_avail (filled samples by the user space) to correct the threshold comparison. The new_hw_ptr argument may also be set to ULONG_MAX which means the initialization phase. In this case, use runtime->status->hw_ptr. Suggested-by: Oswald Buddenhagen Signed-off-by: Jaroslav Kysela Reviewed-by: Oswald Buddenhagen --- sound/core/pcm_lib.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index 3357ffae635f..6ad67e7e740c 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -63,7 +63,15 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram } if (runtime->silence_filled >= runtime->buffer_size) return; - noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled; + /* initialization outside pointer updates */ + if (new_hw_ptr == ULONG_MAX) + new_hw_ptr = runtime->status->hw_ptr; + /* get hw_avail with the boundary crossing */ + noise_dist = appl_ptr - new_hw_ptr; + if (noise_dist < 0) + noise_dist += runtime->boundary; + /* total noise distance */ + noise_dist += runtime->silence_filled; if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold) return; frames = runtime->silence_threshold - noise_dist; From patchwork Fri May 5 15:52:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oswald Buddenhagen X-Patchwork-Id: 13232814 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id C30C7C77B75 for ; Fri, 5 May 2023 15:55:03 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 8A6EF2D69; Fri, 5 May 2023 17:54:11 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 8A6EF2D69 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1683302101; bh=c3REkVFlo9Bl3OSMGTPE0qe+gE7XqT0DcsHqllG2GmA=; h=From:To:Subject:Date:In-Reply-To:References:CC:List-Id: List-Archive:List-Help:List-Owner:List-Post:List-Subscribe: List-Unsubscribe:From; b=LWebTMZlYtRhiWt9yV3t64CH8xm/UrxLt1Wgh5ogxZlEvk8gfiLmxYjQxz70lcWPo SI5DLHEFrajcgpFe3I20w76zyPKMTyiS7wkojsxBz8xPsZ6Ejga9XaSpVHY+he1Dkb xcTYK5G/iYkFa+c45KvGPtS3T6u5h7tflzgqa/u8= Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id C26D2F80578; Fri, 5 May 2023 17:53:05 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 88501F80558; Fri, 5 May 2023 17:52:57 +0200 (CEST) Received: from bluemchen.kde.org (bluemchen.kde.org [209.51.188.41]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id B7CF5F8052E for ; Fri, 5 May 2023 17:52:46 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz B7CF5F8052E Received: from ugly.fritz.box (localhost [127.0.0.1]) by bluemchen.kde.org (Postfix) with ESMTP id 452E523E9C; Fri, 5 May 2023 11:52:45 -0400 (EDT) Received: by ugly.fritz.box (masqmail 0.3.4, from userid 1000) id 1puxjh-hVy-00; Fri, 05 May 2023 17:52:45 +0200 From: Oswald Buddenhagen To: alsa-devel@alsa-project.org Subject: [PATCH v2 3/7] ALSA: pcm: fix playback silence - correct incremental silencing Date: Fri, 5 May 2023 17:52:40 +0200 Message-Id: <20230505155244.2312199-3-oswald.buddenhagen@gmx.de> X-Mailer: git-send-email 2.40.0.152.g15d061e6df In-Reply-To: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> References: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> MIME-Version: 1.0 Message-ID-Hash: SEZYZOS52U3HWM6JO2RBHKYGCSUPARZV X-Message-ID-Hash: SEZYZOS52U3HWM6JO2RBHKYGCSUPARZV X-MailFrom: ossi@kde.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Takashi Iwai X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Jaroslav Kysela Commit 9a826ddba6e ("[ALSA] pcm core: fix silence_start calculations") came with exactly the right commit message, but the patch just made things broken in a different way: We'd fill at a too low address if the area was already partially zeroed, so we'd under-fill. This affected both thresholded mode (where it was somewhat less likely) and top-up mode (where it would be the case consistently). Co-developed-by: Oswald Buddenhagen Signed-off-by: Oswald Buddenhagen Signed-off-by: Jaroslav Kysela --- v2: - rewrote commit message - postponed the addition of comments to a subsequent patch where it makes more sense - dropped the part which the subsequent refactoring obsoletes. this reduces the patch to its essentials, making it easier to understand, and reducing churn. --- sound/core/pcm_lib.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index 6ad67e7e740c..5ddb74a12030 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -87,29 +87,25 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram if (avail > runtime->buffer_size) avail = runtime->buffer_size; runtime->silence_filled = avail > 0 ? avail : 0; - runtime->silence_start = (runtime->status->hw_ptr + - runtime->silence_filled) % - runtime->boundary; + runtime->silence_start = runtime->status->hw_ptr; } else { ofs = runtime->status->hw_ptr; frames = new_hw_ptr - ofs; if ((snd_pcm_sframes_t)frames < 0) frames += runtime->boundary; runtime->silence_filled -= frames; if ((snd_pcm_sframes_t)runtime->silence_filled < 0) { runtime->silence_filled = 0; - runtime->silence_start = new_hw_ptr; - } else { - runtime->silence_start = ofs; } + runtime->silence_start = new_hw_ptr; } frames = runtime->buffer_size - runtime->silence_filled; } if (snd_BUG_ON(frames > runtime->buffer_size)) return; if (frames == 0) return; - ofs = runtime->silence_start % runtime->buffer_size; + ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size; while (frames > 0) { transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames; err = fill_silence_frames(substream, ofs, transfer); From patchwork Fri May 5 15:52:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oswald Buddenhagen X-Patchwork-Id: 13232803 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 047B4C77B7F for ; Fri, 5 May 2023 15:54:13 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 106D72D59; Fri, 5 May 2023 17:53:21 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 106D72D59 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1683302051; bh=7nznjXcOlkL3r4CBDAiXh+lu3tYPdz6ucFyVan6SVG0=; h=From:To:Subject:Date:In-Reply-To:References:CC:List-Id: List-Archive:List-Help:List-Owner:List-Post:List-Subscribe: List-Unsubscribe:From; b=iYULXEUK7bd+nQiKQmZzUBBLm7wpFS3s1Stz9ouPixxf15M3151R9cFl0C32bgP/d 3T+JCF2qBkqkhgKLt4q2Lh8iEFfaSyo41RZZxP7tBSOC49oJ9X79BL1sQF3zAmJpMm Rfy1Js5gwJw68Dmp/03UGssSZ/t3YaEaUE85R75k= Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id 1A1AAF80552; Fri, 5 May 2023 17:52:57 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 3107EF80549; Fri, 5 May 2023 17:52:53 +0200 (CEST) Received: from bluemchen.kde.org (bluemchen.kde.org [209.51.188.41]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 945B0F80534 for ; Fri, 5 May 2023 17:52:46 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 945B0F80534 Received: from ugly.fritz.box (localhost [127.0.0.1]) by bluemchen.kde.org (Postfix) with ESMTP id 48305240D5; Fri, 5 May 2023 11:52:45 -0400 (EDT) Received: by ugly.fritz.box (masqmail 0.3.4, from userid 1000) id 1puxjh-hW4-00; Fri, 05 May 2023 17:52:45 +0200 From: Oswald Buddenhagen To: alsa-devel@alsa-project.org Subject: [PATCH v2 4/7] ALSA: pcm: playback silence - remove extra code Date: Fri, 5 May 2023 17:52:41 +0200 Message-Id: <20230505155244.2312199-4-oswald.buddenhagen@gmx.de> X-Mailer: git-send-email 2.40.0.152.g15d061e6df In-Reply-To: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> References: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> MIME-Version: 1.0 Message-ID-Hash: L7YZKSGXI6BKW3TZU5ZDEXSUINL5U5DI X-Message-ID-Hash: L7YZKSGXI6BKW3TZU5ZDEXSUINL5U5DI X-MailFrom: ossi@kde.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Takashi Iwai X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Jaroslav Kysela The removed condition handles de facto only one situation where runtime->silence_filled variable is equal to runtime->buffer_size, because this variable cannot go over the buffer size. This case is implicitly caught by the required comparison of the noise distance with the threshold. Suggested-by: Oswald Buddenhagen Signed-off-by: Jaroslav Kysela Signed-off-by: Oswald Buddenhagen --- v2: - improved language of commit message --- sound/core/pcm_lib.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index 5ddb74a12030..a1838130c830 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -61,8 +61,6 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram runtime->silence_filled = 0; runtime->silence_start = appl_ptr; } - if (runtime->silence_filled >= runtime->buffer_size) - return; /* initialization outside pointer updates */ if (new_hw_ptr == ULONG_MAX) new_hw_ptr = runtime->status->hw_ptr; From patchwork Fri May 5 15:52:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oswald Buddenhagen X-Patchwork-Id: 13232804 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 9D314C77B75 for ; Fri, 5 May 2023 15:54:34 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 44EC62D5D; Fri, 5 May 2023 17:53:42 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 44EC62D5D DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1683302072; bh=h528SPQwqAje9j+yB54b3DifqhLSj7E3VG4UiBl975c=; h=From:To:Subject:Date:In-Reply-To:References:CC:List-Id: List-Archive:List-Help:List-Owner:List-Post:List-Subscribe: List-Unsubscribe:From; b=eUr3ijw2aNenTC/1ahfbiA68sJMwv2ZQBJJIHcLZypFke6kX7Q8mDEMVeoUCybPc7 90/h/0mMzENd9rmV7lEGCREM28jGtHDvyaVqN5QU3mph6JG9DW30RU2N8IUpNKTHFY o+TWPhLtf39pzCbOa1zpIRJnLM2ZTFWvk9od6+XM= Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id A375AF80557; Fri, 5 May 2023 17:52:59 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 9B844F80542; Fri, 5 May 2023 17:52:54 +0200 (CEST) Received: from bluemchen.kde.org (bluemchen.kde.org [209.51.188.41]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 98528F8053D for ; Fri, 5 May 2023 17:52:46 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 98528F8053D Received: from ugly.fritz.box (localhost [127.0.0.1]) by bluemchen.kde.org (Postfix) with ESMTP id 49E262410B; Fri, 5 May 2023 11:52:45 -0400 (EDT) Received: by ugly.fritz.box (masqmail 0.3.4, from userid 1000) id 1puxjh-hWA-00; Fri, 05 May 2023 17:52:45 +0200 From: Oswald Buddenhagen To: alsa-devel@alsa-project.org Subject: [PATCH v2 5/7] ALSA: pcm: playback silence - move silence variable updates to separate function Date: Fri, 5 May 2023 17:52:42 +0200 Message-Id: <20230505155244.2312199-5-oswald.buddenhagen@gmx.de> X-Mailer: git-send-email 2.40.0.152.g15d061e6df In-Reply-To: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> References: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> MIME-Version: 1.0 Message-ID-Hash: D3VVLNGNXOW336QVCEEZ6U3VZRIVIMPG X-Message-ID-Hash: D3VVLNGNXOW336QVCEEZ6U3VZRIVIMPG X-MailFrom: ossi@kde.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Takashi Iwai X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Jaroslav Kysela The code tracking the added samples in thresholded mode and the code tracking the just played samples in top-up mode are semantically identical, so factor it out to a common function to enhance readability. Co-developed-by: Oswald Buddenhagen Signed-off-by: Oswald Buddenhagen Signed-off-by: Jaroslav Kysela --- v2: - nicer function name and variable name - improved language of commit message --- sound/core/pcm_lib.c | 42 ++++++++++++++++++++++-------------------- 1 file changed, 22 insertions(+), 20 deletions(-) diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index a1838130c830..670572c9a8cc 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -33,6 +33,25 @@ static int fill_silence_frames(struct snd_pcm_substream *substream, snd_pcm_uframes_t off, snd_pcm_uframes_t frames); + +static inline void update_silence_vars(struct snd_pcm_runtime *runtime, + snd_pcm_uframes_t ptr, + snd_pcm_uframes_t new_ptr) +{ + snd_pcm_sframes_t delta; + + delta = new_ptr - ptr; + if (delta == 0) + return; + if (delta < 0) + delta += runtime->boundary; + if ((snd_pcm_uframes_t)delta < runtime->silence_filled) + runtime->silence_filled -= delta; + else + runtime->silence_filled = 0; + runtime->silence_start = new_ptr; +} + /* * fill ring buffer with silence * runtime->silence_start: starting pointer to silence area @@ -49,18 +68,9 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram int err; if (runtime->silence_size < runtime->boundary) { - snd_pcm_sframes_t noise_dist, n; + snd_pcm_sframes_t noise_dist; snd_pcm_uframes_t appl_ptr = READ_ONCE(runtime->control->appl_ptr); - if (runtime->silence_start != appl_ptr) { - n = appl_ptr - runtime->silence_start; - if (n < 0) - n += runtime->boundary; - if ((snd_pcm_uframes_t)n < runtime->silence_filled) - runtime->silence_filled -= n; - else - runtime->silence_filled = 0; - runtime->silence_start = appl_ptr; - } + update_silence_vars(runtime, runtime->silence_start, appl_ptr); /* initialization outside pointer updates */ if (new_hw_ptr == ULONG_MAX) new_hw_ptr = runtime->status->hw_ptr; @@ -87,15 +97,7 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram runtime->silence_filled = avail > 0 ? avail : 0; runtime->silence_start = runtime->status->hw_ptr; } else { - ofs = runtime->status->hw_ptr; - frames = new_hw_ptr - ofs; - if ((snd_pcm_sframes_t)frames < 0) - frames += runtime->boundary; - runtime->silence_filled -= frames; - if ((snd_pcm_sframes_t)runtime->silence_filled < 0) { - runtime->silence_filled = 0; - } - runtime->silence_start = new_hw_ptr; + update_silence_vars(runtime, runtime->status->hw_ptr, new_hw_ptr); } frames = runtime->buffer_size - runtime->silence_filled; } From patchwork Fri May 5 15:52:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oswald Buddenhagen X-Patchwork-Id: 13232813 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 39C6CC77B75 for ; Fri, 5 May 2023 15:54:57 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id AFD832D50; Fri, 5 May 2023 17:54:04 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz AFD832D50 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1683302094; bh=VzJy+Ts5i2HgNZ8Gyv41CKFtZmDxA3gy3iqlsan2xPA=; h=From:To:Subject:Date:In-Reply-To:References:CC:List-Id: List-Archive:List-Help:List-Owner:List-Post:List-Subscribe: List-Unsubscribe:From; b=NtR3Y2A4EQyZxK9E+8mcr7pWwhzxBNGR/rApLGl8fB8MgXR2WBvbNA8xfZolZiLpC uH9mIyIFqldVjaBLSD0AGxKltre18NxlGRv0k0n25BURcUH1wjWLimq++dmQICXpkz BwkQHbd12JmFU4LDLjkId91243zM4ZNQdXCbwBSg= Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id 9E115F8055B; Fri, 5 May 2023 17:53:03 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id F051DF80552; Fri, 5 May 2023 17:52:55 +0200 (CEST) Received: from bluemchen.kde.org (bluemchen.kde.org [209.51.188.41]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 91022F80544 for ; Fri, 5 May 2023 17:52:48 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 91022F80544 Received: from ugly.fritz.box (localhost [127.0.0.1]) by bluemchen.kde.org (Postfix) with ESMTP id 5A99924188; Fri, 5 May 2023 11:52:45 -0400 (EDT) Received: by ugly.fritz.box (masqmail 0.3.4, from userid 1000) id 1puxjh-hWG-00; Fri, 05 May 2023 17:52:45 +0200 From: Oswald Buddenhagen To: alsa-devel@alsa-project.org Subject: [PATCH v2 6/7] ALSA: pcm: simplify top-up mode init in snd_pcm_playback_silence() Date: Fri, 5 May 2023 17:52:43 +0200 Message-Id: <20230505155244.2312199-6-oswald.buddenhagen@gmx.de> X-Mailer: git-send-email 2.40.0.152.g15d061e6df In-Reply-To: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> References: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> MIME-Version: 1.0 Message-ID-Hash: Q63UTVLHS4LL7CPFZALBX26A3KAMSAIF X-Message-ID-Hash: Q63UTVLHS4LL7CPFZALBX26A3KAMSAIF X-MailFrom: ossi@kde.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Takashi Iwai X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Inline the remaining call of snd_pcm_playback_hw_avail(). This makes the top-up branch more congruent with the thresholded one, and allows simplifying the handling of the corner cases. Signed-off-by: Oswald Buddenhagen --- sound/core/pcm_lib.c | 31 ++++++++++++++++++++++++------- 1 file changed, 24 insertions(+), 7 deletions(-) diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index 670572c9a8cc..17fc80a654be 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -90,15 +90,32 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram * This filling mode aims at free-running mode (used for example by dmix), * which doesn't update the application pointer. */ - if (new_hw_ptr == ULONG_MAX) { /* initialization */ - snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime); - if (avail > runtime->buffer_size) - avail = runtime->buffer_size; - runtime->silence_filled = avail > 0 ? avail : 0; - runtime->silence_start = runtime->status->hw_ptr; + snd_pcm_uframes_t hw_ptr = runtime->status->hw_ptr; + if (new_hw_ptr == ULONG_MAX) { + /* + * Initialization, fill the whole unused buffer with silence. + * + * Usually, this is entered while stopped, before data is queued, + * so both pointers are expected to be zero. + */ + snd_pcm_sframes_t avail = runtime->control->appl_ptr - hw_ptr; + if (avail < 0) + avail += runtime->boundary; + /* + * In free-running mode, appl_ptr will be zero even while running, + * so we end up with a huge number. There is no useful way to + * handle this, so we just clear the whole buffer. + */ + runtime->silence_filled = avail > runtime->buffer_size ? 0 : avail; + runtime->silence_start = hw_ptr; } else { - update_silence_vars(runtime, runtime->status->hw_ptr, new_hw_ptr); + /* Silence the just played area immediately */ + update_silence_vars(runtime, hw_ptr, new_hw_ptr); } + /* + * In this mode, silence_filled actually includes the valid + * sample data from the user. + */ frames = runtime->buffer_size - runtime->silence_filled; } if (snd_BUG_ON(frames > runtime->buffer_size)) From patchwork Fri May 5 15:52:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oswald Buddenhagen X-Patchwork-Id: 13232815 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id F2781C77B75 for ; Fri, 5 May 2023 15:55:22 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id EFADD2D4D; Fri, 5 May 2023 17:54:30 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz EFADD2D4D DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1683302121; bh=k7n7eqlG/TRgKNkzu/hg5+IuiMF7Q2VmP7rofJw5Y8I=; h=From:To:Subject:Date:In-Reply-To:References:CC:List-Id: List-Archive:List-Help:List-Owner:List-Post:List-Subscribe: List-Unsubscribe:From; b=mQ2S1Ryv29o4eoDZhRDMGLdC/SeZ+OvBZGG7k6GG10TlFBlbMINv1YjiFUNr1SavM HuRQ7rOtiMrBYT6m9+gxadkviNtsvBSv5W7H0+6igRvyKXxfWstzbb5vIQz00Xc8tM OANhoXoNlAjN1/LyZ3SaJ/i+OxzYQAyW/Wjnn10A= Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id 97137F8057C; Fri, 5 May 2023 17:53:07 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 2712CF80557; Fri, 5 May 2023 17:52:59 +0200 (CEST) Received: from bluemchen.kde.org (bluemchen.kde.org [IPv6:2001:470:142:8::100]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id E9051F80548 for ; Fri, 5 May 2023 17:52:48 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz E9051F80548 Received: from ugly.fritz.box (localhost [127.0.0.1]) by bluemchen.kde.org (Postfix) with ESMTP id 5A4F924173; Fri, 5 May 2023 11:52:45 -0400 (EDT) Received: by ugly.fritz.box (masqmail 0.3.4, from userid 1000) id 1puxjh-hWM-00; Fri, 05 May 2023 17:52:45 +0200 From: Oswald Buddenhagen To: alsa-devel@alsa-project.org Subject: [PATCH v2 7/7] ALSA: pcm: use exit controlled loop in snd_pcm_playback_silence() Date: Fri, 5 May 2023 17:52:44 +0200 Message-Id: <20230505155244.2312199-7-oswald.buddenhagen@gmx.de> X-Mailer: git-send-email 2.40.0.152.g15d061e6df In-Reply-To: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> References: <20230505155244.2312199-1-oswald.buddenhagen@gmx.de> MIME-Version: 1.0 Message-ID-Hash: 6PHRD4XTIGXADYJVEDBW7CZR53QZKNYK X-Message-ID-Hash: 6PHRD4XTIGXADYJVEDBW7CZR53QZKNYK X-MailFrom: ossi@kde.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Takashi Iwai X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: We already know that `frames` is greater than zero, because we just checked it. So we don't need to check the loop condition on the first iteration. Signed-off-by: Oswald Buddenhagen --- sound/core/pcm_lib.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index 17fc80a654be..9c121a921b04 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -123,14 +123,14 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram if (frames == 0) return; ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size; - while (frames > 0) { + do { transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames; err = fill_silence_frames(substream, ofs, transfer); snd_BUG_ON(err < 0); runtime->silence_filled += transfer; frames -= transfer; ofs = 0; - } + } while (frames > 0); snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE); }