Surround example?

Surround example?

[Dino Puller]

Hi all,
    i'd like to code a surround player, but i haven't found any 
documentation about it, can you give me a link to a tutorial or an 
example or something?

Thanks,
   Dino Puller



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Re: Surround example?

[Dino Puller]

Dino Puller wrote:

> Hi all,
>    i'd like to code a surround player, but i haven't found any 
> documentation about it, can you give me a link to a tutorial or an 
> example or something?
>
> Thanks,
>   Dino Puller
>
>
Ok now i've opened my surrond40 device but now what i have to change to 
my snd_pcm_mmap_begin/snd_pcm_mmap_commit routine? Actully i can hear 
noise only from front channels.

bye,
   Dino



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Re: Surround example?

[Takashi Iwai]

At Fri, 18 Nov 2005 13:10:59 +0100,
Dino Puller wrote:
> 
> Dino Puller wrote:
> 
> > Hi all,
> >    i'd like to code a surround player, but i haven't found any 
> > documentation about it, can you give me a link to a tutorial or an 
> > example or something?
> >
> > Thanks,
> >   Dino Puller
> >
> >
> Ok now i've opened my surrond40 device but now what i have to change to 
> my snd_pcm_mmap_begin/snd_pcm_mmap_commit routine? Actully i can hear 
> noise only from front channels.

Are you using 1.0.10-final?


Takashi


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Re: Surround example?

[Dino Puller]

Takashi Iwai wrote:

>At Fri, 18 Nov 2005 13:10:59 +0100,
>Dino Puller wrote:
>  
>
>>Dino Puller wrote:
>>
>>    
>>
>>>Hi all,
>>>   i'd like to code a surround player, but i haven't found any 
>>>documentation about it, can you give me a link to a tutorial or an 
>>>example or something?
>>>
>>>Thanks,
>>>  Dino Puller
>>>
>>>
>>>      
>>>
>>Ok now i've opened my surrond40 device but now what i have to change to 
>>my snd_pcm_mmap_begin/snd_pcm_mmap_commit routine? Actully i can hear 
>>noise only from front channels.
>>    
>>
>
>Are you using 1.0.10-final?
>
>
>Takashi
>
>  
>
No  i'm using default alsalib that come with debian sid: 1.0.9
are there any improvement or issue in 1.0.10 ?
Anyway i've understand where are memory areas to copy in, but my sound 
is a lot disturbed. Probably i need to change some parameters with 4 
channels, but witch?

Dino




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Re: Surround example?

[Takashi Iwai]

At Fri, 18 Nov 2005 14:55:42 +0100,
Dino Puller wrote:
> 
> Takashi Iwai wrote:
> 
> >At Fri, 18 Nov 2005 13:10:59 +0100,
> >Dino Puller wrote:
> >  
> >
> >>Dino Puller wrote:
> >>
> >>    
> >>
> >>>Hi all,
> >>>   i'd like to code a surround player, but i haven't found any 
> >>>documentation about it, can you give me a link to a tutorial or an 
> >>>example or something?
> >>>
> >>>Thanks,
> >>>  Dino Puller
> >>>
> >>>
> >>>      
> >>>
> >>Ok now i've opened my surrond40 device but now what i have to change to 
> >>my snd_pcm_mmap_begin/snd_pcm_mmap_commit routine? Actully i can hear 
> >>noise only from front channels.
> >>    
> >>
> >
> >Are you using 1.0.10-final?
> >
> >
> >Takashi
> >
> >  
> >
> No  i'm using default alsalib that come with debian sid: 1.0.9
> are there any improvement or issue in 1.0.10 ?

Yes.


Takashi


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Re: Surround example?

[Dino Puller]

-------- Original Message --------
Subject: 	Re: [Alsa-devel] Surround example?
Date: 	Sat, 19 Nov 2005 10:25:34 +0100
From: 	Dino Puller <dino@e4a.it>
To: 	Takashi Iwai <tiwai@suse.de>
References: 	<437CFAE5.5080908@e4a.it> <437DC4D3.3050900@e4a.it> 
<s5hoe4ip00t.wl%tiwai@suse.de> <437DDD5E.8060405@e4a.it> 
<s5hlkzmoxxm.wl%tiwai@suse.de>



Takashi Iwai wrote:

>At Fri, 18 Nov 2005 14:55:42 +0100,
>Dino Puller wrote:
>  
>
>>Takashi Iwai wrote:
>>
>>    
>>
>>>At Fri, 18 Nov 2005 13:10:59 +0100,
>>>Dino Puller wrote:
>>> 
>>>
>>>      
>>>
>>>>Dino Puller wrote:
>>>>
>>>>   
>>>>
>>>>        
>>>>
>>>>>Hi all,
>>>>>  i'd like to code a surround player, but i haven't found any 
>>>>>documentation about it, can you give me a link to a tutorial or an 
>>>>>example or something?
>>>>>
>>>>>Thanks,
>>>>> Dino Puller
>>>>>
>>>>>
>>>>>     
>>>>>
>>>>>          
>>>>>
>>>>Ok now i've opened my surrond40 device but now what i have to change to 
>>>>my snd_pcm_mmap_begin/snd_pcm_mmap_commit routine? Actully i can hear 
>>>>noise only from front channels.
>>>>   
>>>>
>>>>        
>>>>
>>>Are you using 1.0.10-final?
>>>
>>>
>>>Takashi
>>>
>>> 
>>>
>>>      
>>>
>>No  i'm using default alsalib that come with debian sid: 1.0.9
>>are there any improvement or issue in 1.0.10 ?
>>    
>>
>
>Yes.
>
>
>Takashi
>
>
>  
>
Hmm i'm looking to pcm.c example but when i lunch
#./pcm -Dsurround40 -c4 -mdirect_interleaved
I obtain:

Access type not available for playback: Invalid argument
Setting of hwparams failed: Invalid argument

And direct mmap interleaved is the method i want to implement. So pcm.c 
isn't a good example for my purpose? Any Documentation?

thanks,
  Dino






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Re: Surround example?

[Takashi Iwai]

At Sat, 19 Nov 2005 10:26:14 +0100,
Dino Puller wrote:
> 
> 
> 
> -------- Original Message --------
> Subject: 	Re: [Alsa-devel] Surround example?
> Date: 	Sat, 19 Nov 2005 10:25:34 +0100
> From: 	Dino Puller <dino@e4a.it>
> To: 	Takashi Iwai <tiwai@suse.de>
> References: 	<437CFAE5.5080908@e4a.it> <437DC4D3.3050900@e4a.it> 
> <s5hoe4ip00t.wl%tiwai@suse.de> <437DDD5E.8060405@e4a.it> 
> <s5hlkzmoxxm.wl%tiwai@suse.de>
> 
> 
> 
> Takashi Iwai wrote:
> 
> >At Fri, 18 Nov 2005 14:55:42 +0100,
> >Dino Puller wrote:
> >  
> >
> >>Takashi Iwai wrote:
> >>
> >>    
> >>
> >>>At Fri, 18 Nov 2005 13:10:59 +0100,
> >>>Dino Puller wrote:
> >>> 
> >>>
> >>>      
> >>>
> >>>>Dino Puller wrote:
> >>>>
> >>>>   
> >>>>
> >>>>        
> >>>>
> >>>>>Hi all,
> >>>>>  i'd like to code a surround player, but i haven't found any 
> >>>>>documentation about it, can you give me a link to a tutorial or an 
> >>>>>example or something?
> >>>>>
> >>>>>Thanks,
> >>>>> Dino Puller
> >>>>>
> >>>>>
> >>>>>     
> >>>>>
> >>>>>          
> >>>>>
> >>>>Ok now i've opened my surrond40 device but now what i have to change to 
> >>>>my snd_pcm_mmap_begin/snd_pcm_mmap_commit routine? Actully i can hear 
> >>>>noise only from front channels.
> >>>>   
> >>>>
> >>>>        
> >>>>
> >>>Are you using 1.0.10-final?
> >>>
> >>>
> >>>Takashi
> >>>
> >>> 
> >>>
> >>>      
> >>>
> >>No  i'm using default alsalib that come with debian sid: 1.0.9
> >>are there any improvement or issue in 1.0.10 ?
> >>    
> >>
> >
> >Yes.
> >
> >
> >Takashi
> >
> >
> >  
> >
> Hmm i'm looking to pcm.c example but when i lunch
> #./pcm -Dsurround40 -c4 -mdirect_interleaved
> I obtain:
> 
> Access type not available for playback: Invalid argument
> Setting of hwparams failed: Invalid argument

WORKSFORME.  Which driver?


Takashi


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Re: Surround example?

[Dino Puller]

Takashi Iwai wrote:

>At Sat, 19 Nov 2005 10:26:14 +0100,
>Dino Puller wrote:
>  
>
>>
>>-------- Original Message --------
>>Subject: 	Re: [Alsa-devel] Surround example?
>>Date: 	Sat, 19 Nov 2005 10:25:34 +0100
>>From: 	Dino Puller <dino@e4a.it>
>>To: 	Takashi Iwai <tiwai@suse.de>
>>References: 	<437CFAE5.5080908@e4a.it> <437DC4D3.3050900@e4a.it> 
>><s5hoe4ip00t.wl%tiwai@suse.de> <437DDD5E.8060405@e4a.it> 
>><s5hlkzmoxxm.wl%tiwai@suse.de>
>>
>>
>>
>>Takashi Iwai wrote:
>>
>>    
>>
>>>At Fri, 18 Nov 2005 14:55:42 +0100,
>>>Dino Puller wrote:
>>> 
>>>
>>>      
>>>
>>>>Takashi Iwai wrote:
>>>>
>>>>   
>>>>
>>>>        
>>>>
>>>>>At Fri, 18 Nov 2005 13:10:59 +0100,
>>>>>Dino Puller wrote:
>>>>>
>>>>>
>>>>>     
>>>>>
>>>>>          
>>>>>
>>>>>>Dino Puller wrote:
>>>>>>
>>>>>>  
>>>>>>
>>>>>>       
>>>>>>
>>>>>>            
>>>>>>
>>>>>>>Hi all,
>>>>>>> i'd like to code a surround player, but i haven't found any 
>>>>>>>documentation about it, can you give me a link to a tutorial or an 
>>>>>>>example or something?
>>>>>>>
>>>>>>>Thanks,
>>>>>>>Dino Puller
>>>>>>>
>>>>>>>
>>>>>>>    
>>>>>>>
>>>>>>>         
>>>>>>>
>>>>>>>              
>>>>>>>
>>>>>>Ok now i've opened my surrond40 device but now what i have to change to 
>>>>>>my snd_pcm_mmap_begin/snd_pcm_mmap_commit routine? Actully i can hear 
>>>>>>noise only from front channels.
>>>>>>  
>>>>>>
>>>>>>       
>>>>>>
>>>>>>            
>>>>>>
>>>>>Are you using 1.0.10-final?
>>>>>
>>>>>
>>>>>Takashi
>>>>>
>>>>>
>>>>>
>>>>>     
>>>>>
>>>>>          
>>>>>
>>>>No  i'm using default alsalib that come with debian sid: 1.0.9
>>>>are there any improvement or issue in 1.0.10 ?
>>>>   
>>>>
>>>>        
>>>>
>>>Yes.
>>>
>>>
>>>Takashi
>>>
>>>
>>> 
>>>
>>>      
>>>
>>Hmm i'm looking to pcm.c example but when i lunch
>>#./pcm -Dsurround40 -c4 -mdirect_interleaved
>>I obtain:
>>
>>Access type not available for playback: Invalid argument
>>Setting of hwparams failed: Invalid argument
>>    
>>
>
>WORKSFORME.  Which driver?
>
>
>Takashi
>  
>
I'm using an Herculess Fortissimo II with a cs46xx driver.
Anyway i was looking for an example/documentation.
I've found that pcm.c is not correct for a mmaped play in surround mode: 
we have to setting the device with SND_PCM_ACCESS_MMAP_COMPLEX flag and 
pcm.c doesn't do it. For the remaining code pcm.c is right and nothing 
change from 2 channels to 4 ones in terms of main loop.
I've found how alsa works, thanks.
Ah direct_loop (always in pcm.c) doesn't use the parameter areas, why 
not to clean it out?

bye,
   Dino




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Re: Surround example?

[Takashi Iwai]

At Mon, 21 Nov 2005 17:57:50 +0100,
Dino Puller wrote:
> 
> Takashi Iwai wrote:
> 
> >At Sat, 19 Nov 2005 10:26:14 +0100,
> >Dino Puller wrote:
> >  
> >
> >>
> >>-------- Original Message --------
> >>Subject: 	Re: [Alsa-devel] Surround example?
> >>Date: 	Sat, 19 Nov 2005 10:25:34 +0100
> >>From: 	Dino Puller <dino@e4a.it>
> >>To: 	Takashi Iwai <tiwai@suse.de>
> >>References: 	<437CFAE5.5080908@e4a.it> <437DC4D3.3050900@e4a.it> 
> >><s5hoe4ip00t.wl%tiwai@suse.de> <437DDD5E.8060405@e4a.it> 
> >><s5hlkzmoxxm.wl%tiwai@suse.de>
> >>
> >>
> >>
> >>Takashi Iwai wrote:
> >>
> >>    
> >>
> >>>At Fri, 18 Nov 2005 14:55:42 +0100,
> >>>Dino Puller wrote:
> >>> 
> >>>
> >>>      
> >>>
> >>>>Takashi Iwai wrote:
> >>>>
> >>>>   
> >>>>
> >>>>        
> >>>>
> >>>>>At Fri, 18 Nov 2005 13:10:59 +0100,
> >>>>>Dino Puller wrote:
> >>>>>
> >>>>>
> >>>>>     
> >>>>>
> >>>>>          
> >>>>>
> >>>>>>Dino Puller wrote:
> >>>>>>
> >>>>>>  
> >>>>>>
> >>>>>>       
> >>>>>>
> >>>>>>            
> >>>>>>
> >>>>>>>Hi all,
> >>>>>>> i'd like to code a surround player, but i haven't found any 
> >>>>>>>documentation about it, can you give me a link to a tutorial or an 
> >>>>>>>example or something?
> >>>>>>>
> >>>>>>>Thanks,
> >>>>>>>Dino Puller
> >>>>>>>
> >>>>>>>
> >>>>>>>    
> >>>>>>>
> >>>>>>>         
> >>>>>>>
> >>>>>>>              
> >>>>>>>
> >>>>>>Ok now i've opened my surrond40 device but now what i have to change to 
> >>>>>>my snd_pcm_mmap_begin/snd_pcm_mmap_commit routine? Actully i can hear 
> >>>>>>noise only from front channels.
> >>>>>>  
> >>>>>>
> >>>>>>       
> >>>>>>
> >>>>>>            
> >>>>>>
> >>>>>Are you using 1.0.10-final?
> >>>>>
> >>>>>
> >>>>>Takashi
> >>>>>
> >>>>>
> >>>>>
> >>>>>     
> >>>>>
> >>>>>          
> >>>>>
> >>>>No  i'm using default alsalib that come with debian sid: 1.0.9
> >>>>are there any improvement or issue in 1.0.10 ?
> >>>>   
> >>>>
> >>>>        
> >>>>
> >>>Yes.
> >>>
> >>>
> >>>Takashi
> >>>
> >>>
> >>> 
> >>>
> >>>      
> >>>
> >>Hmm i'm looking to pcm.c example but when i lunch
> >>#./pcm -Dsurround40 -c4 -mdirect_interleaved
> >>I obtain:
> >>
> >>Access type not available for playback: Invalid argument
> >>Setting of hwparams failed: Invalid argument
> >>    
> >>
> >
> >WORKSFORME.  Which driver?
> >
> >
> >Takashi
> >  
> >
> I'm using an Herculess Fortissimo II with a cs46xx driver.
> Anyway i was looking for an example/documentation.
> I've found that pcm.c is not correct for a mmaped play in surround mode: 
> we have to setting the device with SND_PCM_ACCESS_MMAP_COMPLEX flag and 
> pcm.c doesn't do it. For the remaining code pcm.c is right and nothing 
> change from 2 channels to 4 ones in terms of main loop.
> I've found how alsa works, thanks.
> Ah direct_loop (always in pcm.c) doesn't use the parameter areas, why 
> not to clean it out?

Keeping the uniform function type is nice, IMO.
The parameters are marked as ATTRIBUTE_UNUSED now on CVS.


Takashi


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