* Surround problems with cs46xx
@ 2007-06-16 13:56 Vasilis Manwlopoulos
2007-06-19 10:49 ` Takashi Iwai
0 siblings, 1 reply; 4+ messages in thread
From: Vasilis Manwlopoulos @ 2007-06-16 13:56 UTC (permalink / raw)
To: alsa-devel
Hi,
Sorry for bothering the list again, but I have major problems with the
surround 5.1 sound. I have manually compiled/installed th latest
alsa-1.0.14 drivers but nothing improved. I am using Ubuntu 7.04 and my
soundcard is the Hercules Fortissimo III. This is, as far as I know by
reading on Internet, supported by the module snd-cs46xx in ALSA. I have
enabled the surround sound by creating the following .asoundrc file.
pcm.!default {
type plug
slave.pcm "surround51"
slave.channels 6
route_policy duplicate
}
The problem is that sound pauses whenever I try to do something "heavy"
such as opening a new firefox window or generally another app. Also,
there are delays and echo between the front and the rear speakers from
time to time. I think that the problem is that, this alsa setup(meaning
surround5.1 and the specific soundcard) places a heavy load on the cpu.
There are 99% cpu usage times when the only thing active is a player
playing a "normal bitrate" mp3. When I delete the .asoundrc file and I
switch to default stereo sound using only the 2 front speakers the
problems disappear.
Can anyone suggest anything about this?
Thanks in Advance
V.Manolopoulos
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: Surround problems with cs46xx 2007-06-16 13:56 Surround problems with cs46xx Vasilis Manwlopoulos @ 2007-06-19 10:49 ` Takashi Iwai 2007-06-20 4:49 ` Vasilis Manοlopoulos 0 siblings, 1 reply; 4+ messages in thread From: Takashi Iwai @ 2007-06-19 10:49 UTC (permalink / raw) To: Vasilis Manwlopoulos; +Cc: alsa-devel At Sat, 16 Jun 2007 16:56:53 +0300, Vasilis Manwlopoulos wrote: > > Hi, > > > Sorry for bothering the list again, but I have major problems with the > surround 5.1 sound. I have manually compiled/installed th latest > alsa-1.0.14 drivers but nothing improved. I am using Ubuntu 7.04 and my > soundcard is the Hercules Fortissimo III. This is, as far as I know by > reading on Internet, supported by the module snd-cs46xx in ALSA. I have > enabled the surround sound by creating the following .asoundrc file. > > pcm.!default { > type plug > slave.pcm "surround51" > slave.channels 6 > route_policy duplicate > } > > > The problem is that sound pauses whenever I try to do something "heavy" > such as opening a new firefox window or generally another app. Also, > there are delays and echo between the front and the rear speakers from > time to time. I think that the problem is that, this alsa setup(meaning > surround5.1 and the specific soundcard) places a heavy load on the cpu. > There are 99% cpu usage times when the only thing active is a player > playing a "normal bitrate" mp3. When I delete the .asoundrc file and I > switch to default stereo sound using only the 2 front speakers the > problems disappear. > > Can anyone suggest anything about this? First, try to investigate whether it's a problem of surround51 implementation or rather the "default" definition above. For example, prepare a 6-channel WAV file, and play directly with surround51 PCM. But, from the symptom, I'm afraid it's rather a hardware problem. The cs46xx uses three stereo streams for 5.1 output, and they are not strictly synchronized. And, debugging cs46xx driver is really a nightmare... Takashi ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Surround problems with cs46xx 2007-06-19 10:49 ` Takashi Iwai @ 2007-06-20 4:49 ` Vasilis Manοlopoulos 2007-06-20 10:04 ` Takashi Iwai 0 siblings, 1 reply; 4+ messages in thread From: Vasilis Manοlopoulos @ 2007-06-20 4:49 UTC (permalink / raw) To: Takashi Iwai; +Cc: alsa-devel Thanks for the reply Takashi. I don't think that this is hardware problem, cause in windows XP, using the drivers by the manufacturer Hercules, the sound is fine. About the test you mentioned, I 'll check it when I find free time on weekend and I 'll let you know the results. I hope you could provide me some further help then. Unfortunately I am new in linux & sound issues, so creating a 6 channel wav file and the whole procedure is a bit difficult to me and it's better to deal with it in the weekend!! Regards. O/H Takashi Iwai έγραψε: > At Sat, 16 Jun 2007 16:56:53 +0300, > Vasilis Manwlopoulos wrote: > >> Hi, >> >> >> Sorry for bothering the list again, but I have major problems with the >> surround 5.1 sound. I have manually compiled/installed th latest >> alsa-1.0.14 drivers but nothing improved. I am using Ubuntu 7.04 and my >> soundcard is the Hercules Fortissimo III. This is, as far as I know by >> reading on Internet, supported by the module snd-cs46xx in ALSA. I have >> enabled the surround sound by creating the following .asoundrc file. >> >> pcm.!default { >> type plug >> slave.pcm "surround51" >> slave.channels 6 >> route_policy duplicate >> } >> >> >> The problem is that sound pauses whenever I try to do something "heavy" >> such as opening a new firefox window or generally another app. Also, >> there are delays and echo between the front and the rear speakers from >> time to time. I think that the problem is that, this alsa setup(meaning >> surround5.1 and the specific soundcard) places a heavy load on the cpu. >> There are 99% cpu usage times when the only thing active is a player >> playing a "normal bitrate" mp3. When I delete the .asoundrc file and I >> switch to default stereo sound using only the 2 front speakers the >> problems disappear. >> >> Can anyone suggest anything about this? >> > > First, try to investigate whether it's a problem of surround51 > implementation or rather the "default" definition above. > For example, prepare a 6-channel WAV file, and play directly with > surround51 PCM. > > But, from the symptom, I'm afraid it's rather a hardware problem. > The cs46xx uses three stereo streams for 5.1 output, and they are not > strictly synchronized. And, debugging cs46xx driver is really a > nightmare... > > > Takashi > > _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Surround problems with cs46xx 2007-06-20 4:49 ` Vasilis Manοlopoulos @ 2007-06-20 10:04 ` Takashi Iwai 0 siblings, 0 replies; 4+ messages in thread From: Takashi Iwai @ 2007-06-20 10:04 UTC (permalink / raw) To: Vasilis Manοlopoulos; +Cc: alsa-devel At Tue, 19 Jun 2007 21:49:01 -0700, Vasilis Manοlopoulos wrote: > > > Thanks for the reply Takashi. > I don't think that this is hardware problem, cause in windows XP, using > the drivers by the manufacturer Hercules, the sound is fine. About the > test you mentioned, I 'll check it when I find free time on weekend and > I 'll let you know the results. I hope you could provide me some further > help then. Unfortunately I am new in linux & sound issues, so creating a > 6 channel wav file and the whole procedure is a bit difficult to me and > it's better to deal with it in the weekend!! Well, I didn't mean that your hardware is broken. Rather I meant that it's hardware-specific problem due to the current driver implementation (three parallel streams without synchronization). Takashi > > > > Regards. > > > > O/H Takashi Iwai έγραψε: > > At Sat, 16 Jun 2007 16:56:53 +0300, > > Vasilis Manwlopoulos wrote: > > > >> Hi, > >> > >> > >> Sorry for bothering the list again, but I have major problems with the > >> surround 5.1 sound. I have manually compiled/installed th latest > >> alsa-1.0.14 drivers but nothing improved. I am using Ubuntu 7.04 and my > >> soundcard is the Hercules Fortissimo III. This is, as far as I know by > >> reading on Internet, supported by the module snd-cs46xx in ALSA. I have > >> enabled the surround sound by creating the following .asoundrc file. > >> > >> pcm.!default { > >> type plug > >> slave.pcm "surround51" > >> slave.channels 6 > >> route_policy duplicate > >> } > >> > >> > >> The problem is that sound pauses whenever I try to do something "heavy" > >> such as opening a new firefox window or generally another app. Also, > >> there are delays and echo between the front and the rear speakers from > >> time to time. I think that the problem is that, this alsa setup(meaning > >> surround5.1 and the specific soundcard) places a heavy load on the cpu. > >> There are 99% cpu usage times when the only thing active is a player > >> playing a "normal bitrate" mp3. When I delete the .asoundrc file and I > >> switch to default stereo sound using only the 2 front speakers the > >> problems disappear. > >> > >> Can anyone suggest anything about this? > >> > > > > First, try to investigate whether it's a problem of surround51 > > implementation or rather the "default" definition above. > > For example, prepare a 6-channel WAV file, and play directly with > > surround51 PCM. > > > > But, from the symptom, I'm afraid it's rather a hardware problem. > > The cs46xx uses three stereo streams for 5.1 output, and they are not > > strictly synchronized. And, debugging cs46xx driver is really a > > nightmare... > > > > > > Takashi > > > > > _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2007-06-20 10:04 UTC | newest] Thread overview: 4+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2007-06-16 13:56 Surround problems with cs46xx Vasilis Manwlopoulos 2007-06-19 10:49 ` Takashi Iwai 2007-06-20 4:49 ` Vasilis Manοlopoulos 2007-06-20 10:04 ` Takashi Iwai
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