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>]

James Courtier-Dutton wrote:

> 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
>
Can you send me a URL so that I can download 
"from_beyond_the_edge_44k_256kbps.ac3" and test it on my system.
My external AC3 decoder requires the info bits to be set to "non-audio" 
just like yours.
I might be able to get it working if I have a sample stream.
I have been wanting to get 44.1khz AC3 working for a long time, but have 
never had a stream to play with.
I understand that you can get some enharnaced CDs now which have 
non-audio AC3 data on them instead of PCM, and I would like to be able 
to play these in linux.
Cheers
James




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