At Thu, 29 Mar 2007 17:05:00 +0200, Christian F.K. Schaller wrote: > > On Thu, 2007-03-29 at 16:41 +0200, Takashi Iwai wrote: > > At Thu, 29 Mar 2007 16:37:51 +0200, > > Christian F.K. Schaller wrote: > > > > > > On Thu, 2007-03-29 at 16:17 +0200, Takashi Iwai wrote: > > > > At Thu, 29 Mar 2007 15:57:22 +0200, > > > > Christian F.K. Schaller wrote: > > > > > > > > > > On Thu, 2007-03-29 at 14:01 +0200, Takashi Iwai wrote: > > > > > > > > > > <snip> > > > > > > > Since Jan brought up the issue of behaviour differences between > > > > > > > plug:surround51 ad surround51 I thought I give you the output of that > > > > > > > too. > > > > > > > > > > > > > > aplay -D surround51:0 dust51.wav > > > > > > > Playing WAVE 'dust51.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, > > > > > > > Channels 6 > > > > > > > aplay: set_params:878: Broken configuration for this PCM: no > > > > > > > configurations available > > > > > > > > > > > > > > aplay -D plug:surround51:0 dust51.wav > > > > > > > Playing WAVE 'dust51.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, > > > > > > > Channels 6 > > > > > > > ALSA lib pcm_params.c:2152:(snd_pcm_hw_refine_slave) Slave PCM not > > > > > > > usable > > > > > > > aplay: set_params:878: Broken configuration for this PCM: no > > > > > > > configurations available > > > > > > > > > > > > Which hardware do you have and which alsa-lib version are you using? > > > > > > surround51 should work in this case... > > > > > > > > > > [cschalle@localhost Desktop]$ aplay -l > > > > > **** List of PLAYBACK Hardware Devices **** > > > > > card 0: I82801DBICH4 [Intel 82801DB-ICH4], device 0: Intel ICH [Intel > > > > > 82801DB-ICH4] > > > > > Subdevices: 1/1 > > > > > Subdevice #0: subdevice #0 > > > > > card 0: I82801DBICH4 [Intel 82801DB-ICH4], device 4: Intel ICH - IEC958 > > > > > [Intel 82801DB-ICH4 - IEC958] > > > > > Subdevices: 1/1 > > > > > Subdevice #0: subdevice #0 > > > > > > > > > > [cschalle@localhost Desktop]$ rpm -qa|grep alsa > > > > > alsa-lib-1.0.14-0.1.rc1.fc6 > > > > > alsa-lib-devel-1.0.14-0.1.rc1.fc6 > > > > > alsa-tools-1.0.12-4.fc6 > > > > > alsa-utils-1.0.14-0.1.rc1.fc6 > > > > > > > > So far, so good. And which codec chip? > > > > > > > > You may see more (sometimes too) verbose errors when you set > > > > the environment variable LIBASOUND_DEBUG=1 or 2. Give it a try. > > > > > > > Hi Takashi > > > > > > How do I figure out the codec chip? > > > > Grr, sorry, I removed a line while I corected the later sentenses. > > Look at /proc/asound/card0/codec97#0/* files. > > > > > Also I am not sure what you are > > > looking for here, are you saying that the surround51 device should work > > > even on stereo only soundcards? > > > > No, "surround51" is exclusive to 6 channels. > > > > > and by using that Alsa should > > > automatically downmix? > > > > Actually, it's a bit complicated. Currently, "default" PCM is set up > > for two channels. You can override it as 5.1 channels, or even a > > virtual 5.1 surround for headphone. The automatic upmix is also > > possible if you set up 5.1 as default. However, all these things are > > not provided "as is". This is really what we have to consider how to > > do better. > > > > I personally am not satisfied by the current implementation from > > usability POV. So, any suggestions for further improvements are > > welcome. > > > > > > thanks, > > > > Takashi > > > Ok, so the content of that file is: > 0-0/0: SigmaTel STAC9750,51 > > PCI Subsys Vendor: 0x1028 > PCI Subsys Device: 0x0191 > > Capabilities : -headphone out- > DAC resolution : 20-bit > ADC resolution : 20-bit > 3D enhancement : SigmaTel 3D Enhancement > > Current setup > Mic gain : +20dB [+20dB] > POP path : pre 3D > Sim. stereo : off > 3D enhancement : off > Loudness : off > Mono output : MIX > Mic select : Mic1 > ADC/DAC loopback : off > Extended ID : codec=0 rev=1 AMAP DSA=0 SPDIF VRA > Extended status : SPCV SPDIF=10/11 VRA > PCM front DAC : 48000Hz > PCM ADC : 48000Hz > SPDIF Control : Consumer PCM Category=0x2 Generation=1 Rate=48kHz OK this explains all. This codec has no surround outputs. So, 5.1 output isn't really supported. > So my suggestion so far when we have been discussing this inside the > GStreamer community is to use 'front' as default device instead of > 'default'. A drawback of "front" is that it doesn't include the software mixing feature. (Dito for "surround*" and "spdif") So far, only "default" PCM has a dmix as it is. If gstream is the only sound system, it'd be fine, though. > That way we will always play(downmix) all channels and nobody 'lose' > sound. We can then provide configuration GUI's like Totem do to override > this when people have surround capable systems (meaning both capable > card and connected speakers). Do this sound like a reasonable approach t > you? It sounds reasonable to me. Or, you can simply assume number of channels for each preset, i.e. 2ch = default, 4ch = plug:surround40, 5.1ch = plug:surround51, without querying alsa-lib. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
