[gst-devel] IEC958 caps

[Gruenke, Matt]

I guess IEC 958 has the pre-emphasis info in-band.  I think HDCD is not, however.

In my experience, it's neither true that the pre-emphasis bit is wrong nor that it's ignored.  I don't know what you mean about it being in the data stream - I'm talking about PCM, here.  Pre-emphasis should be a property of audio/x-raw-int, since it would otherwise get lost, at that point.

HDCD could be a property of both audio/x-iec958 and audio/x-raw-int, but there's probably a better case for adding it to audio/x-raw-int than audio/x-iec958.


Matt


-----Original Message-----
From: pl bossart [mailto:bossart.nospam at gmail.com] 
Sent: Tuesday, October 12, 2010 16:51
To: Discussion of the development of GStreamer
Subject: Re: [gst-devel] IEC958 caps

> Are you going to add a pre-emphasis property?

No, I was not planning to fill the channel status or user bits. My
experience is that most receivers ignore channel status bits since
they are vastly unreliable. Most solutions actually check the data
stream and do not trust the information in those control bits.

> An HDCD property would also be interesting.  It can be auto-detected,
> but perhaps there might be cases where it's already known to be present,
> or where you want to detect it w/o decoding it.

I am looking at passing data that's already compressed through
alsasink/pulsesink. I don't really see how this could be of any
interested for HDCD, i.e. PCM only?
-Pierre

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