pony wang wrote:
What I want to do?
I want to play a wave file (22050Hz, 2-ch) via SPDIF channel.
What’s my problem?
I think the ICH4 audio controller can’t convert PCM data of 22050Hz to
48KHz.
And the Codec can’t either (codec generally accept 3 sample rates: 32K,
44.1K, 48K).
What’s my question?
* Is there any way to convert PCM data on audio controller side to 48K
before being put to AC-Link?
* The VIA 8235 audio Controller seems have the capability to convert PCM
data to 48KHz before sending to AC-Link, but ICH4 seems hasn’t, isn’t it?
* How can I play PCM data like 22050Hz via SPDIF Channel? Shall I
convert it to 48KHz before I send it to audio controller?
What I have tried?
*My hardware: ICH4 (Audio Controller) + ALC650 (Codec) + Jazz Audio Decoder.
*I tried to carry 22050Hz PCM data on slot 3&4 with PO Channel, with the
VRA bit (Codec register 2A[0]) on. And I told Codec to get SPDIF data on
slot3&4 too (Codec register 2A[5:4], SPSA). I try to play PCM data via
PO and SPDIF simultaneously. But only the PO channel works, the SPDIF
only accept 48KHz, 44.1KHz and 32KHz data. So I can't hear anything in
SPDIF channel for 22050 PCM data.
Thank you for your help! I'm expecting to your reply!
Sincerely,
Pony
Resample the 22050Hz PCM to 48000Hz before sending it to the sound
device. For example: The audio application xine (xine.sf.net) can do
this. Just set the "force rate" config item to 48.
Alsa's resamplers might be also be able to do this translation, if the
low level hardware driver is telling the upper layers the correct
information.
Cheers
James
---
This SF.Net email sponsored by: Free pre-built ASP.NET sites including
Data Reports, E-commerce, Portals, and Forums are available now.
Download today and enter to win an XBOX or Visual Studio .NET.
http://aspnet.click-url.com/go/psa0013ave/direct;at.aspnet_072303_01/01
___
Alsa-devel mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/alsa-devel
