From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anssi Hannula Subject: Re: Audio Mini Conference Minutes - Edinburgh 21st October 2013 Date: Thu, 21 Nov 2013 21:58:10 +0200 Message-ID: <528E65D2.7010507@iki.fi> References: <1382985876.2334.64.camel@loki> <1384796142.2319.12.camel@loki> <20131121182211.GD8120@sirena.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sinikuusama.dnainternet.net (sinikuusama.dnainternet.net [83.102.40.134]) by alsa0.perex.cz (Postfix) with ESMTP id ABB992610AB for ; Thu, 21 Nov 2013 20:58:19 +0100 (CET) In-Reply-To: <20131121182211.GD8120@sirena.org.uk> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Mark Brown , Liam Girdwood Cc: alsa-devel , wangxingchao@xiaomi.com, Wang Xingchao , ruyi@xiaomi.com, Eric Laurent List-Id: alsa-devel@alsa-project.org 21.11.2013 20:22, Mark Brown kirjoitti: > On Mon, Nov 18, 2013 at 05:35:42PM +0000, Liam Girdwood wrote: >> On Sat, 2013-11-16 at 17:01 +0800, Wang Xingchao wrote: > >>>> We could use offload, on roadmap for Hires audio on android PCM, >>>> maybe float instead of 24 bit. Need for 192kHz, Probably not use effects. > >>> Does android support HBR audio now? As i know from Dolby guys, no >>> customers in Android area are buying Dolby TrueHD license, so i guess >>> the answer is NO. Most of the customers are from AV receivers and >>> BlueRay players. > >> Afaik, no one is using high Bit rate audio atm, but there is increasing >> interest amongst Android OEMs. > > There's a few things shipped doing 192kHz/24 bit - the LG G2 was one of > the first IIRC. At least Wang Xingchao seems to be talking specifically about HBR in relation to HDMI specification, i.e. compressed audio, not PCM... HBR audio is the way high-bitrate (over 6.144Mbps) compressed IEC 61937 streams are bitstreamed through HDMI. The only such formats supported by IEC 61937 are DTS-HD MA and Dolby TrueHD (MAT), used on e.g. Blu-ray discs. The only in-tree ALSA driver supporting HDMI HBR is HDA, AFAICS. >> Most of the x86 and ARM HW will support HBR audio over ASoC PCM DAIs and >> HDA, but I'm not sure about which HDMI audio devices support HBR in HW >> atm... > > It should be relatively common I suppose given that video sources have > tended to use HBR for a long time (even DVDs do it as standard), though > it's possible the mobile > chipsets are limited in some way. Video DVDs only do PCM, AC-3, DTS and MP2. -- -- Anssi Hannula