From patchwork Wed Jun 8 19:42:48 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: han.lu@intel.com X-Patchwork-Id: 9164357 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 BCFC860572 for ; Wed, 8 Jun 2016 11:48:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AADB0269A3 for ; Wed, 8 Jun 2016 11:48:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9CD9728047; Wed, 8 Jun 2016 11:48:11 +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=0.0 required=2.0 tests=BAYES_00, DATE_IN_FUTURE_06_12, 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 D28A9269A3 for ; Wed, 8 Jun 2016 11:48:10 +0000 (UTC) Received: by alsa0.perex.cz (Postfix, from userid 1000) id B0ACF266749; Wed, 8 Jun 2016 13:48:09 +0200 (CEST) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id 08EDC266549; Wed, 8 Jun 2016 13:46:50 +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 6F23626649A; Wed, 8 Jun 2016 13:46:48 +0200 (CEST) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by alsa0.perex.cz (Postfix) with ESMTP id 91E772657E5 for ; Wed, 8 Jun 2016 13:46:39 +0200 (CEST) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 08 Jun 2016 04:46:36 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,438,1459839600"; d="scan'208";a="997728495" Received: from hanlu-optiplex-9020.sh.intel.com ([10.239.13.11]) by fmsmga002.fm.intel.com with ESMTP; 08 Jun 2016 04:44:49 -0700 From: han.lu@intel.com To: tiwai@suse.de, liam.r.girdwood@linux.intel.com, alsa-devel@alsa-project.org Date: Thu, 9 Jun 2016 03:42:48 +0800 Message-Id: X-Mailer: git-send-email 2.5.0 In-Reply-To: References: In-Reply-To: References: Cc: "Lu, Han" Subject: [alsa-devel] [PATCH 3/4] alsabat: add a single channel sine wave generator 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 From: "Lu, Han" Add function generate_sine_wave_raw_mono(). It serves as a single channel sine wave generator, to provide data for calculation (e.g. for noise analysis). The function is similar to generate_sine_wave(), but a lite revision. It has no dependency on bat channels and target frequency, no malloc inside, no data conversion from float to integer samples, and supports one channel only. Signed-off-by: Lu, Han diff --git a/bat/bat-signal.h b/bat/bat-signal.h index a295517..3c314a5 100644 --- a/bat/bat-signal.h +++ b/bat/bat-signal.h @@ -28,3 +28,4 @@ int sin_generator_init(struct sin_generator *, float, float, float); float sin_generator_next_sample(struct sin_generator *); void sin_generator_vfill(struct sin_generator *, float *, int); int generate_sine_wave(struct bat *, int, void *); +int generate_sine_wave_raw_mono(struct bat *, float *, float, int); diff --git a/bat/signal.c b/bat/signal.c index 2047f53..c9b5c7b 100644 --- a/bat/signal.c +++ b/bat/signal.c @@ -183,3 +183,21 @@ exit: return err; } + +/* generate single channel sine waveform without sample conversion */ +int generate_sine_wave_raw_mono(struct bat *bat, float *buf, + float freq, int nsamples) +{ + int err = 0; + struct sin_generator sg; + + err = sin_generator_init(&sg, 1.0, freq, bat->rate); + if (err < 0) + return err; + sin_generator_vfill(&sg, buf, nsamples); + + /* adjust amplitude and offset of waveform */ + err = adjust_waveform(bat, buf, nsamples, 1); + + return err; +}