Re: How to put 16bit none audio PCM data stream into a 32bit none audio S/P-DIF transport stream?

[James Courtier-Dutton <James@superbug.demon.co.uk>]

Gregoire Favre wrote:

>On Tue, Apr 08, 2003 at 05:50:48PM +0200, Takashi Iwai wrote:
>
>  
>
>>i'm afraid that it's not so easy as it sounds.  it strongly depends
>>on the hardware driver implementation...
>>
>>about AC3, 32bit spdif is likely irrelevant.  A52 (AC3) is usally
>>packed into normal 16bit frames.
>>
>>does the click happen even if you use alsa-tool's ac3dec?
>>    
>>
>
>Yes and no:
>
>./ac3dec -C /data/linux/dvb/from_beyond_the_edge_44k_256kbps.ac3 don't
>produce any sound at all now... except ONE big click at the beginning,
>same with -P and
>./ac3dec -R /data/linux/dvb/from_beyond_the_edge_44k_256kbps.ac3
>5.1 Mode 44.1 KHz 256 kbps Complete Main Audio Service
>Using PCM device 'iec958:AES0=0x0,AES1=0x82,AES2=0x0,AES3=0x2'
>
>Produces also the same big click and then plays quiete good (only 2.0 no
>dolby digital is sent to the receiver...).
>
>Thank you very much,
>
>	Gr?goire
>________________________________________________________________
>http://ulima.unil.ch/greg ICQ:16624071 mailto:greg@ulima.unil.ch
>
>  
>
On my SB Live, with AC3 I use: -
PCM device "iec958:AES0=0x6,AES1=0x82,AES2=0x0,AES3=0x2"

On your example AES0=0x0, whereas I have AES0=0x6.
It is AES0 which sets the non-audio bits in the SPDIF.

Cheers
James





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