[MPlayer-dev-eng] MPEG to S/PDIF passthrough

[Ulion]

2008/3/5, Ilkka Karvinen <kartsan at gmail.com>:
> There have been no comments on this patch. I'm wondering if there could be
>  people around here who have a home theater amplifier which supports MPEG
>  audio? It would be interesting to hear if this feature works with your
>  hardware. Especially if you are running mplayer on a bigendian machine
>  since I can't currently test this code on a such machine.
>
>  If your amplifier supports AC3/DTM decoding, its DSP may also support
>  MPEG audio. My old Harman Kardon amplifier uses Cirrus Logic's DSP
>  which supports it and that was my initial reason to start investigating
>  this stuff.
>
>  I send attached diff that Ulion made for me if you would like to give a try to
>  this feature. It adds new codec hwmp3 which redirects the MPEG frames to
>  hardware via S/PDIF.
>
>  I have tested it and it works with mp3 audio files and video files with
>  mp3 audio track. However, some mp3 files do not work and I don't know
>  why. My guess is that their frames are not recognised by my hardware.
>  There are no similarities with the failing samples. Another sample with
>  equal parameters (header bits are the same) may work flawlessly.

found some problem about this patch:

in decode_audio():
+  uint16_t *buf16 = (uint16_t *)buf;

should this be put into the while loop and looks like this:

+  uint16_t *buf16 = (uint16_t *)(buf + toc);


-- 
Ulion