Re: Problem with multiopen on SB Audigy 2

[Takashi Iwai <tiwai@suse.de>]

At Wed, 8 Oct 2003 13:08:38 +0200 (CEST),
Jaroslav wrote:
> 
> On Tue, 7 Oct 2003, James Courtier-Dutton wrote:
> 
> > Takashi Iwai wrote:
> > > At Tue, 07 Oct 2003 18:00:22 +0100,
> > > James Courtier-Dutton wrote:
> > >
> > >>I have 2 sound cards, card 0 is the motherboard intel/alc650 one, and
> > >>card 1 is a SB Audigy2
> > >>
> > >>Playing two streams at once on device "front:1" works: -
> > >>aplay -D front:1 filename.wav
> > >>aplay -D front:1 filename.wav
> > >>So, this is playing two files to the SB Audigy2 front speakers.
> > >>I can hear the two files being mixed together and output together to a
> > >>single set of speakers.
> > >>
> > >>Playing two streams at once on device "rear:1" fails: -
> > >>aplay -D rear:1 filename.wav
> > >>aplay -D rear:1 filename.wav
> > >>So, this is trying to play two files to the SB Audigy2 rear speakers.
> > >>
> > >>The first files comes out of the rear speakers, but the output from the
> > >>second aplay command fails with: -
> > >>
> > >>bash-2.05b# aplay -D rear:1 filename.wav
> > >>Playing WAVE 'filename.wav' : Signed 16 bit Little Endian, Rate 44100
> > >>Hz, Stereo
> > >>ALSA lib setup.c:94:(snd_sctl_install) Cannot lock ctl elem
> > >>aplay: set_params:876: Unable to install hw params:
> > >>ACCESS:  RW_INTERLEAVED
> > >>FORMAT:  S16_LE
> > >>SUBFORMAT:  STD
> > >>SAMPLE_BITS: 16
> > >>FRAME_BITS: 32
> > >>CHANNELS: 2
> > >>RATE: 44100
> > >>PERIOD_TIME: (125011 125012)
> > >>PERIOD_SIZE: 5513
> > >>PERIOD_BYTES: 22052
> > >>PERIODS: 2
> > >>BUFFER_TIME: (250022 250023)
> > >>BUFFER_SIZE: 11026
> > >>BUFFER_BYTES: 44104
> > >>TICK_TIME: 1000
> > >>
> > >>Can you explain why this might be happening?
> > >
> > >
> > > this is because the "Wave Surround Playback Volume" control is locked
> > > by the first rear stream.
> > > you can find it in /usr/share/alsa/cards/Audigy2.conf.
> > > please try to remove the lock.
> > >
> > >
> > > Takashi
> > >
> > Thanks that fixed the problem.
> > Please see attached patch files, for the SB Live and Audigy2, both of
> > which have been tested.
> 
> Yes, but the question is, if we want this behaviour. We expect that the
> rear channel will go only via rear speakers thus setting of Wave Surround
> Volume is required.

but the signals from "rear" pcm stream should come in fact only from
the rear channels, regardless of "Wave Surround Playback Volume",
because it sets max send-volume to FX bus 2/3, and zero to others.

setting "Wave Surround Playback" would allow other pcm streams to
route the front signals to the surround, but it's a user's choice.
i don't think this exclusive behavior is necessary.


or am i missing something?


Takashi


-------------------------------------------------------
This sf.net email is sponsored by:ThinkGeek
Welcome to geek heaven.
http://thinkgeek.com/sf