From mboxrd@z Thu Jan 1 00:00:00 1970 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.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 BA4F6C5320E for ; Tue, 20 Aug 2024 08:31:16 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Wp2jv38sZz2y8W; Tue, 20 Aug 2024 18:31:15 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=192.198.163.12 Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=lNxcYCAn; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=linux.intel.com (client-ip=192.198.163.12; helo=mgamail.intel.com; envelope-from=pierre-louis.bossart@linux.intel.com; receiver=lists.ozlabs.org) Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Wp2js1Q7tz2y33 for ; Tue, 20 Aug 2024 18:31:11 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1724142673; x=1755678673; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=SxmH7pCBUCC/+QtkYdWoPaRpX3/WrQ/u9Dt4Kgg2sL8=; b=lNxcYCAnVAgZNShfF3lPAGaXa3RKU9DWI0GjT6uWLREpoRof072cb+hs IZNHtdFPekHucGmJx02jTKQcyIPkvqarA1YTKzwt7KfXzCC2YvwdT+wOf pgdmO/mlIcLz1sP5SvWcTMqiITafvUI7u6gQoNN2gHn0QYXVKdsme4RaO TfVBeoUAUUmegJcSKhrnd70vBzW/Bi2Cvxc4xauLiT1g1BlAUF3GUf5Bx 9a9zybGXX12b6ayy77/nEZ361YEWb7WBlhZk77cexiM8PUbPVe1NqF9P6 wE0XAl+McPxYy9v3fhFMqQNaa0EtPCnogZdWdb5IAijS1NummTkBEP+pl A==; X-CSE-ConnectionGUID: GwnStFAkQbCsG2hQ0msQbA== X-CSE-MsgGUID: kMCqh/FORzum/fie0gTw1w== X-IronPort-AV: E=McAfee;i="6700,10204,11169"; a="26293746" X-IronPort-AV: E=Sophos;i="6.10,161,1719903600"; d="scan'208";a="26293746" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Aug 2024 01:30:31 -0700 X-CSE-ConnectionGUID: 6z9L+SnLRMOV5s7hbb1iIg== X-CSE-MsgGUID: MjGIrylhS/StVmcl8sSHaA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,161,1719903600"; d="scan'208";a="64838542" Received: from fdefranc-mobl3.ger.corp.intel.com (HELO [10.245.246.176]) ([10.245.246.176]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Aug 2024 01:30:27 -0700 Message-ID: <0cd6ed17-0bbd-4a72-884a-632c7de3977f@linux.intel.com> Date: Tue, 20 Aug 2024 10:30:24 +0200 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Post: List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH v2 4/6] ASoC: fsl_asrc_m2m: Add memory to memory function To: Jaroslav Kysela , Shengjiu Wang Cc: Shengjiu Wang , vkoul@kernel.org, tiwai@suse.com, alsa-devel@alsa-project.org, linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org, Xiubo.Lee@gmail.com, festevam@gmail.com, nicoleotsuka@gmail.com, lgirdwood@gmail.com, broonie@kernel.org, linuxppc-dev@lists.ozlabs.org References: <1723804959-31921-1-git-send-email-shengjiu.wang@nxp.com> <1723804959-31921-5-git-send-email-shengjiu.wang@nxp.com> <6d83cd58-5f02-414b-b627-a0022e071052@linux.intel.com> Content-Language: en-US From: Pierre-Louis Bossart In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 8/20/24 09:42, Jaroslav Kysela wrote: > On 20. 08. 24 9:37, Shengjiu Wang wrote: >> On Tue, Aug 20, 2024 at 2:59 PM Pierre-Louis Bossart >> wrote: >>> >>> >>> >>> On 8/20/24 04:53, Shengjiu Wang wrote: >>>> On Mon, Aug 19, 2024 at 3:42 PM Pierre-Louis Bossart >>>> wrote: >>>>> >>>>> >>>>> >>>>> On 8/16/24 12:42, Shengjiu Wang wrote: >>>>>> Implement the ASRC memory to memory function using >>>>>> the compress framework, user can use this function with >>>>>> compress ioctl interface. >>>>>> >>>>>> Define below private metadata key value for output >>>>>> format, output rate and ratio modifier configuration. >>>>>> ASRC_OUTPUT_FORMAT 0x80000001 >>>>>> ASRC_OUTPUT_RATE   0x80000002 >>>>>> ASRC_RATIO_MOD     0x80000003 >>>>> >>>>> Can the output format/rate change at run-time? >>>> >>>> Seldom I think. >>>> >>>>> >>>>> If no, then these parameters should be moved somewhere else - e.g. >>>>> hw_params or something. >>>> >>>> This means I will do some changes in compress_params.h, add >>>> output format and output rate definition, follow Jaroslav's example >>>> right? >>> >>> yes, having parameters for the PCM case would make sense. >>> >>>>> I am still not very clear on the expanding the SET_METADATA ioctl to >>>>> deal with the ratio changes. This isn't linked to the control layer as >>>>> suggested before, and there's no precedent of calling it multiple >>>>> times >>>>> during streaming. >>>> >>>> Which control layer? if you means the snd_kcontrol_new?  it is bound >>>> with sound card,  but in my case,  I need to the control bind with >>>> the snd_compr_stream to support multi streams/instances. >>> >>> I can only quote Jaroslav's previous answer: >>> >>> " >>> This argument is not valid. The controls are bound to the card, but the >>> element identifiers have already iface (interface), device and subdevice >>> numbers. We are using controls for PCM devices for example. The binding >>> is straight. >>> >>> Just add SNDRV_CTL_ELEM_IFACE_COMPRESS define and specify the compress >>> device number in the 'struct snd_ctl_elem_id'. >>> " >> >> I don't think it is doable,  or at least I don't know how to do it. >> >> My case is just one card/one device/one subdevice.  can't use it to >> distinguish multi streams. > > I already wrote that the compress core code should be extended to > support subdevices like other ALSA APIs. I'll work on it. For now, just > add support for one converter. I am not sure I get the benefits of subdevices in this context. Can we not use different devices already, one per hardware ASRC instance? Put differently, what would be the difference between a card with N compressed devices or a card with 1 compressed device and N subdevices?