Re: Surround example?

[Dino Puller <dino@e4a.it>]

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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