From patchwork Tue Aug 21 01:06:50 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Guedes, Andre" X-Patchwork-Id: 10570893 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A2A7F14E1 for ; Tue, 21 Aug 2018 01:07:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8399628EE2 for ; Tue, 21 Aug 2018 01:07:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7808229B4D; Tue, 21 Aug 2018 01:07:22 +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=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, 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 9DAC428EE2 for ; Tue, 21 Aug 2018 01:07:21 +0000 (UTC) Received: from alsa0.perex.cz (localhost [127.0.0.1]) by alsa0.perex.cz (Postfix) with ESMTP id 82A9726766E; Tue, 21 Aug 2018 03:07:12 +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 002B12676D8; Tue, 21 Aug 2018 03:07:08 +0200 (CEST) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by alsa0.perex.cz (Postfix) with ESMTP id C50F32676C7 for ; Tue, 21 Aug 2018 03:07:05 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 20 Aug 2018 18:07:00 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,267,1531810800"; d="scan'208";a="66795958" Received: from aguedesl-mobl1.jf.intel.com ([10.24.14.33]) by orsmga008.jf.intel.com with ESMTP; 20 Aug 2018 18:06:59 -0700 From: Andre Guedes To: alsa-devel@alsa-project.org Date: Mon, 20 Aug 2018 18:06:50 -0700 Message-Id: <20180821010653.15838-3-andre.guedes@intel.com> X-Mailer: git-send-email 2.14.4 In-Reply-To: <20180821010653.15838-1-andre.guedes@intel.com> References: <20180821010653.15838-1-andre.guedes@intel.com> Cc: liam.r.girdwood@intel.com Subject: [alsa-devel] [RFC - AAF PCM plugin 2/5] aaf: Load configuration parameters 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 This patch implements the infrastructure to load the plugin configuration from ALSA configuration file. The configuration is loaded in open() callback. All configuration parameters are described in details in doc/aaf.txt file. Signed-off-by: Andre Guedes --- aaf/pcm_aaf.c | 126 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ doc/aaf.txt | 52 ++++++++++++++++++++++++ 2 files changed, 178 insertions(+) diff --git a/aaf/pcm_aaf.c b/aaf/pcm_aaf.c index 7890e10..4c6f031 100644 --- a/aaf/pcm_aaf.c +++ b/aaf/pcm_aaf.c @@ -20,11 +20,133 @@ #include #include +#include +#include +#include +#include + +#define NSEC_PER_USEC 1000ULL typedef struct { snd_pcm_ioplug_t io; + + char ifname[IFNAMSIZ]; + uint8_t addr[ETH_ALEN]; + int prio; + uint64_t streamid; + int mtt; + int t_uncertainty; + int frames_per_pkt; } snd_pcm_aaf_t; +static int aaf_load_config(snd_pcm_aaf_t *aaf, snd_config_t *conf) +{ + snd_config_iterator_t cur, next; + + snd_config_for_each(cur, next, conf) { + snd_config_t *entry = snd_config_iterator_entry(cur); + const char *id; + + if (snd_config_get_id(entry, &id) < 0) + goto err; + + if (strcmp(id, "comment") == 0 || + strcmp(id, "type") == 0 || + strcmp(id, "hint") == 0) + continue; + + if (strcmp(id, "ifname") == 0) { + const char *ifname; + + if (snd_config_get_string(entry, &ifname) < 0) + goto err; + + snprintf(aaf->ifname, sizeof(aaf->ifname), "%s", + ifname); + } else if (strcmp(id, "addr") == 0) { + const char *addr; + int n; + + if (snd_config_get_string(entry, &addr) < 0) + goto err; + + n = sscanf(addr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", + &aaf->addr[0], &aaf->addr[1], + &aaf->addr[2], &aaf->addr[3], + &aaf->addr[4], &aaf->addr[5]); + if (n != 6) + goto err; + } else if (strcmp(id, "prio") == 0) { + long prio; + + if (snd_config_get_integer(entry, &prio) < 0) + goto err; + + if (prio < 0) + goto err; + + aaf->prio = prio; + } else if (strcmp(id, "streamid") == 0) { + const char *streamid; + int n; + uint64_t buf[7]; + + if (snd_config_get_string(entry, &streamid) < 0) + goto err; + + n = sscanf(streamid, "%lx:%lx:%lx:%lx:%lx:%lx:%lx", + &buf[0], &buf[1], &buf[2], &buf[3], + &buf[4], &buf[5], &buf[6]); + if (n != 7) + goto err; + + aaf->streamid = buf[0] << 56 | buf[1] << 48 | + buf[2] << 40 | buf[3] << 32 | + buf[4] << 24 | buf[5] << 16 | + buf[6]; + } else if (strcmp(id, "mtt") == 0) { + long mtt; + + if (snd_config_get_integer(entry, &mtt) < 0) + goto err; + + if (mtt < 0) + goto err; + + aaf->mtt = mtt * NSEC_PER_USEC; + } else if (strcmp(id, "time_uncertainty") == 0) { + long t_uncertainty; + + if (snd_config_get_integer(entry, &t_uncertainty) < 0) + goto err; + + if (t_uncertainty < 0) + goto err; + + aaf->t_uncertainty = t_uncertainty * NSEC_PER_USEC; + } else if (strcmp(id, "frames_per_pkt") == 0) { + long frames_per_pkt; + + if (snd_config_get_integer(entry, &frames_per_pkt) < 0) + goto err; + + if (frames_per_pkt < 0) + goto err; + + aaf->frames_per_pkt = frames_per_pkt; + } else { + SNDERR("Invalid configuration: %s", id); + goto err; + } + } + + return 0; + +err: + SNDERR("Error loading device configuration"); + return -EINVAL; +} + static int aaf_close(snd_pcm_ioplug_t *io) { snd_pcm_aaf_t *aaf = io->private_data; @@ -70,6 +192,10 @@ SND_PCM_PLUGIN_DEFINE_FUNC(aaf) return -ENOMEM; } + res = aaf_load_config(aaf, conf); + if (res < 0) + goto err; + aaf->io.version = SND_PCM_IOPLUG_VERSION; aaf->io.name = "AVTP Audio Format (AAF) Plugin"; aaf->io.callback = &aaf_callback; diff --git a/doc/aaf.txt b/doc/aaf.txt index 22144de..24ea888 100644 --- a/doc/aaf.txt +++ b/doc/aaf.txt @@ -16,3 +16,55 @@ The AAF plugin uses libavtp to handle AVTP packetization. Libavtp source code can be found in https://github.com/AVnu/libavtp as well as instructions to build and install it. If libavtp isn't detected by configure, the plugin isn't built. + +Plugin Configuration +-------------------- + +The plugin parameters are passed via ALSA configuration file. They are defined +as follows: + + * ifname: Network interface used to transmit/receive AVTP packets. + + * addr: Stream destination MAC address. + + * prio: Priority used by the plugin to transmit AVTP traffic. This + option is relevant only when operating in playback mode. + + * streamid: Stream ID associated with the AAF stream transmitted or + received by the plugin. + + * mtt: Maximum Transit Time (in microseconds) as defined in AVTP spec + section 4.3.3. This option is relevant only when operating in + playback mode. + + * time_uncertainty: Maximum Time Uncertainty (in microseconds) as + defined by AVTP spec section 4.3.3. This option is relevant only when + operating in playback mode. + + * frames_per_pkt: Number of audio frames transmitted in one AVTP + packet. + +The plugin provides the PCM type "aaf". Configure an AAF PCM virtual device +according to the AAF stream you want to transmit or receive. A hypothetical +configuration file is shown below: + + pcm.aaf { + type aaf + ifname eth0 + addr AA:AA:AA:AA:AA:AA + prio 3 + streamid BB:BB:BB:BB:BB:BB:0001 + mtt 2000 + time_uncertainty 125 + frames_per_pkt 6 + } + +Put the above to ~/.asoundrc (or /etc/asound.conf), and use the AAF PCM virtual +device with your ALSA apps. For example, to stream the content from a wav file +through the network, run: + + $ aplay -Daaf foo.wav + +To receive the AAF stream generated by the previous command, run: + + $ arecord -Daaf