From patchwork Thu Jul 14 14:07:19 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Sakamoto X-Patchwork-Id: 9229867 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id AD31E6075D for ; Thu, 14 Jul 2016 14:10:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9BC712817F for ; Thu, 14 Jul 2016 14:10:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8F1AC281E1; Thu, 14 Jul 2016 14:10:39 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 86CD92817F for ; Thu, 14 Jul 2016 14:10:38 +0000 (UTC) Received: by alsa0.perex.cz (Postfix, from userid 1000) id 3C54E266946; Thu, 14 Jul 2016 16:10:32 +0200 (CEST) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id 7D07B2666ED; Thu, 14 Jul 2016 16:08:19 +0200 (CEST) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa0.perex.cz (Postfix, from userid 1000) id 954D3265873; Thu, 14 Jul 2016 16:08:17 +0200 (CEST) Received: from smtp-proxy003.phy.lolipop.jp (smtp-proxy003.phy.lolipop.jp [157.7.104.44]) by alsa0.perex.cz (Postfix) with ESMTP id C58F626582F for ; Thu, 14 Jul 2016 16:08:06 +0200 (CEST) Received: from smtp-proxy003.phy.lolipop.lan (HELO smtp-proxy003.phy.lolipop.jp) (172.19.44.44) (smtp-auth username m12129643-o-takashi, mechanism plain) by smtp-proxy003.phy.lolipop.jp (qpsmtpd/0.82) with ESMTPA; Thu, 14 Jul 2016 23:08:03 +0900 Received: from 127.0.0.1 (127.0.0.1) by smtp-proxy003.phy.lolipop.jp (LOLIPOP-Fsecure); Thu, 14 Jul 2016 23:07:52 +0900 (JST) X-Virus-Status: clean(LOLIPOP-Fsecure) From: Takashi Sakamoto To: tiwai@suse.de Date: Thu, 14 Jul 2016 23:07:19 +0900 Message-Id: <1468505271-5769-3-git-send-email-o-takashi@sakamocchi.jp> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1468505271-5769-1-git-send-email-o-takashi@sakamocchi.jp> References: <1468505271-5769-1-git-send-email-o-takashi@sakamocchi.jp> Cc: alsa-devel@alsa-project.org Subject: [alsa-devel] [PATCH 02/34] pcm: remove alloca() from snd_pcm_set_params() X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.14 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: , MIME-Version: 1.0 Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org X-Virus-Scanned: ClamAV using ClamSMTP Both of alloca() and automatic variables keeps storages on stack, while the former generates more instructions than the latter. It's better to use the latter if the size of storage is computable at pre-compile or compile time; i.e. just for structures. This commit obsolete usages of alloca() with automatic variables. Signed-off-by: Takashi Sakamoto --- src/pcm/pcm.c | 52 +++++++++++++++++++++++++--------------------------- 1 file changed, 25 insertions(+), 27 deletions(-) diff --git a/src/pcm/pcm.c b/src/pcm/pcm.c index 64f841d..4cace0b 100644 --- a/src/pcm/pcm.c +++ b/src/pcm/pcm.c @@ -8291,47 +8291,44 @@ int snd_pcm_set_params(snd_pcm_t *pcm, int soft_resample, unsigned int latency) { - snd_pcm_hw_params_t *params, params_saved; - snd_pcm_sw_params_t *swparams; + snd_pcm_hw_params_t params_saved, params = {0}; + snd_pcm_sw_params_t swparams = {0}; const char *s = snd_pcm_stream_name(snd_pcm_stream(pcm)); snd_pcm_uframes_t buffer_size, period_size; unsigned int rrate, period_time; int err; - snd_pcm_hw_params_alloca(¶ms); - snd_pcm_sw_params_alloca(&swparams); - assert(pcm); /* choose all parameters */ - err = snd_pcm_hw_params_any(pcm, params); + err = snd_pcm_hw_params_any(pcm, ¶ms); if (err < 0) { SNDERR("Broken configuration for %s: no configurations available", s); return err; } /* set software resampling */ - err = snd_pcm_hw_params_set_rate_resample(pcm, params, soft_resample); + err = snd_pcm_hw_params_set_rate_resample(pcm, ¶ms, soft_resample); if (err < 0) { SNDERR("Resampling setup failed for %s: %s", s, snd_strerror(err)); return err; } /* set the selected read/write format */ - err = snd_pcm_hw_params_set_access(pcm, params, access); + err = snd_pcm_hw_params_set_access(pcm, ¶ms, access); if (err < 0) { SNDERR("Access type not available for %s: %s", s, snd_strerror(err)); return err; } /* set the sample format */ - err = snd_pcm_hw_params_set_format(pcm, params, format); + err = snd_pcm_hw_params_set_format(pcm, ¶ms, format); if (err < 0) { SNDERR("Sample format not available for %s: %s", s, snd_strerror(err)); return err; } /* set the count of channels */ - err = snd_pcm_hw_params_set_channels(pcm, params, channels); + err = snd_pcm_hw_params_set_channels(pcm, ¶ms, channels); if (err < 0) { SNDERR("Channels count (%i) not available for %s: %s", channels, s, snd_strerror(err)); @@ -8339,7 +8336,8 @@ int snd_pcm_set_params(snd_pcm_t *pcm, } /* set the stream rate */ rrate = rate; - err = INTERNAL(snd_pcm_hw_params_set_rate_near)(pcm, params, &rrate, 0); + err = INTERNAL(snd_pcm_hw_params_set_rate_near)(pcm, ¶ms, &rrate, + 0); if (err < 0) { SNDERR("Rate %iHz not available for playback: %s", rate, snd_strerror(err)); @@ -8351,22 +8349,22 @@ int snd_pcm_set_params(snd_pcm_t *pcm, return -EINVAL; } /* set the buffer time */ - params_saved = *params; - err = INTERNAL(snd_pcm_hw_params_set_buffer_time_near)(pcm, params, + params_saved = params; + err = INTERNAL(snd_pcm_hw_params_set_buffer_time_near)(pcm, ¶ms, &latency, NULL); if (err < 0) { /* error path -> set period size as first */ - *params = params_saved; + params = params_saved; /* set the period time */ period_time = latency / 4; err = INTERNAL(snd_pcm_hw_params_set_period_time_near)(pcm, - params, &period_time, NULL); + ¶ms, &period_time, NULL); if (err < 0) { SNDERR("Unable to set period time %i for %s: %s", period_time, s, snd_strerror(err)); return err; } - err = INTERNAL(snd_pcm_hw_params_get_period_size)(params, + err = INTERNAL(snd_pcm_hw_params_get_period_size)(¶ms, &period_size, NULL); if (err < 0) { SNDERR("Unable to get period size for %s: %s", @@ -8375,13 +8373,13 @@ int snd_pcm_set_params(snd_pcm_t *pcm, } buffer_size = period_size * 4; err = INTERNAL(snd_pcm_hw_params_set_buffer_size_near)(pcm, - params, &buffer_size); + ¶ms, &buffer_size); if (err < 0) { SNDERR("Unable to set buffer size %lu %s: %s", buffer_size, s, snd_strerror(err)); return err; } - err = INTERNAL(snd_pcm_hw_params_get_buffer_size)(params, + err = INTERNAL(snd_pcm_hw_params_get_buffer_size)(¶ms, &buffer_size); if (err < 0) { SNDERR("Unable to get buffer size for %s: %s", @@ -8390,14 +8388,14 @@ int snd_pcm_set_params(snd_pcm_t *pcm, } } else { /* standard configuration buffer_time -> periods */ - err = INTERNAL(snd_pcm_hw_params_get_buffer_size)(params, + err = INTERNAL(snd_pcm_hw_params_get_buffer_size)(¶ms, &buffer_size); if (err < 0) { SNDERR("Unable to get buffer size for %s: %s", s, snd_strerror(err)); return err; } - err = INTERNAL(snd_pcm_hw_params_get_buffer_time)(params, + err = INTERNAL(snd_pcm_hw_params_get_buffer_time)(¶ms, &latency, NULL); if (err < 0) { SNDERR("Unable to get buffer time (latency) for %s: %s", @@ -8407,13 +8405,13 @@ int snd_pcm_set_params(snd_pcm_t *pcm, /* set the period time */ period_time = latency / 4; err = INTERNAL(snd_pcm_hw_params_set_period_time_near)(pcm, - params, &period_time, NULL); + ¶ms, &period_time, NULL); if (err < 0) { SNDERR("Unable to set period time %i for %s: %s", period_time, s, snd_strerror(err)); return err; } - err = INTERNAL(snd_pcm_hw_params_get_period_size)(params, + err = INTERNAL(snd_pcm_hw_params_get_period_size)(¶ms, &period_size, NULL); if (err < 0) { SNDERR("Unable to get period size for %s: %s", @@ -8422,7 +8420,7 @@ int snd_pcm_set_params(snd_pcm_t *pcm, } } /* write the parameters to device */ - err = snd_pcm_hw_params(pcm, params); + err = snd_pcm_hw_params(pcm, ¶ms); if (err < 0) { SNDERR("Unable to set hw params for %s: %s", s, snd_strerror(err)); @@ -8430,7 +8428,7 @@ int snd_pcm_set_params(snd_pcm_t *pcm, } /* get the current swparams */ - err = snd_pcm_sw_params_current(pcm, swparams); + err = snd_pcm_sw_params_current(pcm, &swparams); if (err < 0) { SNDERR("Unable to determine current swparams for %s: %s", s, snd_strerror(err)); @@ -8440,7 +8438,7 @@ int snd_pcm_set_params(snd_pcm_t *pcm, * start the transfer when the buffer is almost full: * (buffer_size / avail_min) * avail_min */ - err = snd_pcm_sw_params_set_start_threshold(pcm, swparams, + err = snd_pcm_sw_params_set_start_threshold(pcm, &swparams, (buffer_size / period_size) * period_size); if (err < 0) { SNDERR("Unable to set start threshold mode for %s: %s", @@ -8451,14 +8449,14 @@ int snd_pcm_set_params(snd_pcm_t *pcm, * allow the transfer when at least period_size samples can be * processed */ - err = snd_pcm_sw_params_set_avail_min(pcm, swparams, period_size); + err = snd_pcm_sw_params_set_avail_min(pcm, &swparams, period_size); if (err < 0) { SNDERR("Unable to set avail min for %s: %s", s, snd_strerror(err)); return err; } /* write the parameters to the playback device */ - err = snd_pcm_sw_params(pcm, swparams); + err = snd_pcm_sw_params(pcm, &swparams); if (err < 0) { SNDERR("Unable to set sw params for %s: %s", s, snd_strerror(err));