[alsa-devel] External Sound Card
I am looking for a external sound card that has spdif (7.1) functioning. The driver Soundblaster nx usb seems like it is under active development. The alsa documentation page says that spdif is not working. Is the documentation page out of date or is someone working on that capability? If spdif capability is not in the near future, can someone suggest a sound device (spdif capable) that I could look at. Thanks.
John
John Dey wrote:
I am looking for a external sound card that has spdif (7.1) functioning.
7.1 encoding is done in software, not in hardware. I don't know of any 7.1 encoder for Linux.
ALSA has the a52 plugin that can do 5.1 encoding for any sound card that has SPDIF, but you'd have to compile it with the ffmpeg library to get it to work.
HTH Clemens
Clemens,
Thanks for your response. The 5.1 or 7.1 capability is not as important to me as having 6 or 8 independent jack channels to connect 4 or 8 channels from an application (ambiosonics from aeolus). Without adding the a52 plugin would I see more than 2 outputs in qjackctl? With the plugin would I see 6 outputs?
On Oct 30, 2007, at 1:19 PM, Clemens Ladisch wrote:s
John Dey wrote:
I am looking for a external sound card that has spdif (7.1) functioning.
7.1 encoding is done in software, not in hardware. I don't know of any 7.1 encoder for Linux.
ALSA has the a52 plugin that can do 5.1 encoding for any sound card that has SPDIF, but you'd have to compile it with the ffmpeg library to get it to work.
HTH Clemens _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
John Dey wrote:
Thanks for your response. The 5.1 or 7.1 capability is not as important to me as having 6 or 8 independent jack channels to connect 4 or 8 channels from an application (ambiosonics from aeolus). Without adding the a52 plugin would I see more than 2 outputs in qjackctl?
No; SPDIF has been designed to transport two channels. The only way to get the data of more channels through SPDIF is to compress it with some algorithm like AC-3/DD/DTS.
With the plugin would I see 6 outputs?
Yes.
HTH Clemens
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John Dey