From mboxrd@z Thu Jan 1 00:00:00 1970 From: Clemens Ladisch Subject: Re: [alsa-devel] Compressed Audio Playback/Capture through ALSA framework Date: Wed, 16 Mar 2011 08:21:48 +0100 Message-ID: <4D80650C.4000006@ladisch.de> References: <4D7FB076.30300@codeaurora.org> <4D7FCEA3.4070003@audioscience.com> <4D7FF63B.40805@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4D7FF63B.40805@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org To: Patrick Lai Cc: Eliot Blennerhassett , linux-arm-msm@vger.kernel.org, alsa-devel List-Id: alsa-devel@alsa-project.org Patrick Lai wrote: > Why is AC3 passthrough acceptable Because it pretends to be a normal 16-bit stereo stream at 48 kHz, the only difference is that the IEC958 non-audio bit is set. > but not other compressed audio format? Other formats like DTS or WMA can be transported in the same way. > Eliot Blennerhassett wrote: > > ALSA might be extended to cope with compressed audio with fixed frame > > size and bitrate, but dealing with any VBR encoding is likely to be even > > more problematic. Regards, Clemens