From: Anssi Hannula <anssi.hannula@iki.fi>
To: Xuebing Wang <xbing6@gmail.com>
Cc: Libin Yang <libin.yang@intel.com>,
"; Mengdong Lin" <mengdong.lin@intel.com>,
"alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
"; Wu Fengguang" <wfg@linux.intel.com>,
"; Takashi Iwai" <tiwai@suse.de>
Subject: Re: DSD over HDMI: audio data packetization
Date: Wed, 31 Dec 2014 15:40:39 +0200 [thread overview]
Message-ID: <54A3FCD7.2010902@iki.fi> (raw)
In-Reply-To: <1420032720.2102.14.camel@gmail.com>
31.12.2014, 15:32, Xuebing Wang kirjoitti:
> Hi Community,
Hi,
> I am trying to implement DSD (one bit audio) over HDMI, for Intel
> integrated graphics. I am referencing HDMI specification 1.3a.
>
> Regarding audio data packetization, I am referencing spec:
> 5.3.4 Audio Sample Packet
> 7.6 Audio Data Packetization
>
> Q1) Would you please point to me where is the source code to handle
> L-PCM audio sample packetization (to implement 5.3.4 Audio Sample
> Packet)?
It is done by the hardware.
> Q2) I admit that I did not carefully read HD-Audio specification. Is
> this possible that this L-PCM audio data packetization is done by
> *hardware* (e.g HDMI related widgets/pins)?
Yes.
> Q3) Did we implement "7.2 Audio Sample Clock Capture and Regeneration"?
That is done by hardware. With some HDA codecs the video driver
calculates the N/CTS values "manually", but AFAIK not on Intel HW.
> Thanks.
> Xuebing Wang
>
>
--
Anssi Hannula
next prev parent reply other threads:[~2014-12-31 13:40 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-31 13:32 DSD over HDMI: audio data packetization Xuebing Wang
2014-12-31 13:40 ` Anssi Hannula [this message]
2014-12-31 14:28 ` Yang, Libin
2014-12-31 15:38 ` Xuebing Wang
2014-12-31 15:45 ` Anssi Hannula
2015-01-01 2:07 ` Yang, Libin
2015-01-01 4:37 ` Anssi Hannula
2015-01-04 3:10 ` Xuebing Wang
2015-01-05 3:46 ` Anssi Hannula
[not found] ` <CAGzU1+F0Os59UwRXRpZQnibDeT0KLK1UqX__Qv9=agwQTkZWyg@mail.gmail.com>
2015-01-06 4:49 ` Anssi Hannula
2015-01-06 6:15 ` Andrej Falout
2015-01-06 7:02 ` Anssi Hannula
2015-01-06 4:54 ` Xuebing Wang
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