[alsa-devel] [PATCH 0/3] HDMI HBR(High Bit Rate) Feature bug fix for Intel's Chips

Takashi Iwai tiwai at suse.de
Thu Sep 6 08:53:53 CEST 2012

At Thu,  6 Sep 2012 10:02:35 +0800,
Wang Xingchao wrote:
> As i have no A/V receiver handy and could not test HBR playback directly, i
> removed the "RFC" type until the patchset was tested and proved working well.
> The patchset was tested on Intel chips and get positive feedback. 
> Quote from "Øyvind Kvålsvoll <oyvind at kvalsvoll.com>":
> "TrueHD and DTS-MA work fine from XBMC, 2-ch playback also works fine
> from XBMC.
> Channels are all mapped to the right speaker, all 7.1." 
> Quote from alanwww1:
> "I tested the patches. They work perfectly. I tested it with both DTS Master
> Audio and Dolby Tru HD streams.
> Also tested with speaker-test. Channel mapping was right."
> From: http://forum.xbmc.org/showthread.php?tid=128298&pid=1184574#pid1184574
> Maybe there's still potential bug and i will keep on track that.
> The idea of this patch comes from Anssi, Big credit to him at first!
> Thanks the guys from XBMC forum which help test the patches.
> For people interested to test the patch, please remember to apply another change in
> alsa-lib side, you can refer to the patch detail from XBMC forum:
> http://forum.xbmc.org/showthread.php?tid=128298&pid=1178776#pid1178776

Note that the alsa-lib fix isn't necessarily applied to all systems.
The bug appears only on systems with both SPDIF and HDMI.

In anyway, I applied the kernel patches now.  Thanks.


> I will send that patch to alsa-lib mail-list later.
> Changelog:
> * do not touch channel_allocation priority order, use new api to get
> correct channels number
> * use spdif->status to check audio type, pcm or non-pcm 
> * create new non_pcm_mapping[] for non_pcm audio in seperate block
> * add non_pcm hdmi_spec_per_cvt to remember previous audio type, used to 
>   determine whether need a channel mapping update during the pcm/non-pcm 
>   stream switch with same channel number.
> Wang Xingchao (3):
>   ALSA: HDMI - Fix channel_allocation array wrong order
>   ALSA: HDMI - Enable HBR feature on Intel chips
>   ALSA: HDMI - Setup channel mapping for non_pcm audio
>  sound/pci/hda/patch_hdmi.c |   56 ++++++++++++++++++++++++++++++++++++++++----
>  1 file changed, 51 insertions(+), 5 deletions(-)
> -- 

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