[MPlayer-dev-eng] wma spdif passthrough

[Ulion]

2007/11/17, Ulion <ulion2002 at gmail.com>:
> 2007/11/15, Ulion <ulion2002 at gmail.com>:
> > There's some trick I think maybe help: If we can capture the digital
> > output when wmp doing the passthrough(such like like output to another
> > digital input of a sound card and record), after research the captured
> > stream, maybe we can figure out how to split wma pro frames from a raw
> > wma pro stream that's what I currently need to know. Or a sound card
> > sniffer support spdif would help also.
> >
>
> I did the capture, got the spdif output from wmp11's output.
>
> Test file is this:
> http://samples.mplayerhq.hu/A-codecs/WMA9/wmapro/Beethovens%20nionde%20symfoni%20(Scherzo)-2.wma
>
> The correct spdif output for the beginning of that wma file is
> uploaded to upload.mplayerhq.hu, located at
> ftp://upload.mplayerhq.hu/MPlayer/incoming/wmapro_spdif/
>
> After little look through, beside the IEC 61937 8 bytes header, the
> spdif output of wma pro also has sync frame header for each wma pro
> frame. The sync frame header seems can be identified by '28 11 07 F0',
> but the sync header seems not existed in the original wma pro file,
> and also, each payload part of spdif for wmapro seems also has a frame
> end, it also seems not existed in the wma file. So only way to
> passthrough wmapro is to figure out how the frame header and end be
> added or rely on some wma dmoes to do that.
>
> Any help is wellcome for this problem.
>

The uploaded dir can not be accessed by anonymous users now, so rxt
help copied them here:
http://natsuki.mplayerhq.hu/~rtogni/wmapro_spdif/

-- 
Ulion