Re: [alsa-devel] MCP7A HDMI passthrough audio Linux/ALSA

At Wed, 01 Jul 2009 11:18:15 +0200, Stéphane BERTHELOT wrote:

Takashi Iwai a écrit :

At Tue, 30 Jun 2009 22:51:03 +0200,
Stephane BERTHELOT wrote:

Hm, so apparently your TV doesn't accept non-audio format?
But TV accepted the ac3dec output with -R option, right?
(Make sure this -- otherwise ac3dec might have decoded by itself.)

Basically, -R means to send the encoded an AC3 stream (packed in the
SPDIF format) without setting non-audio bit.  Whether non-audio bit is
1 or 0 is the only difference between -C and -R.  So, if -R really
works but not -C, it means that the non-audio bit must be off no
matter what you send.  Weird.

I'm sure the TV only accepted -R and not -C (or -P) with the same ac3 file. But I'm confused since I was quite sure -R would *decode* ac3 to PCM and then send it in LPCM format.

Ah, yes, of course. That's logical, then, that -R works.

Hm, then it's an issue of receiver side? Can Windows send the raw AC3 and TV decodes it properly?

Takashi