From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Revell Subject: Re: [Alsa-devel] Re: ALSA / emu10k1 / SPDIF / surround? Date: Tue, 30 Aug 2005 20:26:14 -0400 Message-ID: <1125447974.19563.34.camel@mindpipe> References: <1124755115.5763.3.camel@hostmaster.org> <1125166820.22285.68.camel@hostmaster.org> <1125168446.25011.68.camel@mindpipe> <1125173150.22285.103.camel@hostmaster.org> <1125174445.25011.76.camel@mindpipe> <1125177706.22285.144.camel@hostmaster.org> <1125178767.25011.86.camel@mindpipe> <1125181627.22285.155.camel@hostmaster.org> <1125183623.25011.102.camel@mindpipe> <1125195487.2684.8.camel@hostmaster.org> <1125196132.25011.111.camel@mindpipe> <1125325907.4598.23.camel@mindpipe> <1125342246.21560.2.camel@hostmaster.org> <1125345314.4598.58.camel@mindpipe> <1125356738.21560.27.camel@hostmaster.org> <1125356936.4598.83.camel@mindpipe> <1125446643.1785.15.camel@hostmaster.org> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1125446643.1785.15.camel@hostmaster.org> Sender: alsa-user-admin@lists.sourceforge.net Errors-To: alsa-user-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Thomas Zehetbauer Cc: Takashi Iwai , alsa-devel , ALSA user list List-Id: alsa-devel@alsa-project.org On Wed, 2005-08-31 at 02:04 +0200, Thomas Zehetbauer wrote: > On Mon, 2005-08-29 at 19:08 -0400, Lee Revell wrote: > > I guess you already looked at Documentation/SB-Live-mixer.txt? > > Sure I have, but I don't think this documentation is correct: > > "Wave (Surround|Center|LFE) Playback Volume" apparently do some kind of > stereo upmixing. I guess that is why I have seen these controls going to > zero when using 6 channel output. Actually the docs are correct: name='Wave Playback Volume',index=0 This control is used to attenuate samples for left and right PCM FX-bus accumulators. ALSA uses accumulators 0 and 1 for left and right PCM samples. The result samples are forwarded to the front DAC PCM slots of the AC97 codec. name='Wave Surround Playback Volume',index=0 This control is used to attenuate samples for left and right PCM FX-bus accumulators. ALSA uses accumulators 0 and 1 for left and right PCM samples. The result samples are forwarded to the rear I2S DACs. These DACs operates separately (they are not inside the AC97 codec). name='Wave Center Playback Volume',index=0 This control is used to attenuate samples for left and right PCM FX-bus accumulators. ALSA uses accumulators 0 and 1 for left and right PCM samples. The result is mixed to mono signal (single channel) and forwarded to the ??rear?? right DAC PCM slot of the AC97 codec. name='Wave LFE Playback Volume',index=0 This control is used to attenuate samples for left and right PCM FX-bus accumulators. ALSA uses accumulators 0 and 1 for left and right PCM. The result is mixed to mono signal (single channel) and forwarded to the ??rear?? left DAC PCM slot of the AC97 codec. Lee ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf