On Thu, Feb 12, 2009 at 01:02:41AM +0200, Takashi Iwai wrote:
> At Wed, 11 Feb 2009 14:54:48 -0800,
> Shane W wrote:
> >
> > On Wed, Feb 11, 2009 at 11:42:00PM +0100, Takashi Iwai wrote:
> > > At Wed, 11 Feb 2009 14:32:41 -0800,
> > > Shane W wrote:
> > > > missing. The order in the wav is:
> > > > front left
> > > > centre
> > > > front right
> > > > rear left
> > > > rear right
> > > > sub buz
> > >
> > > The order assumed here doesn't match with ALSA mapping.
> > > In ALSA,
> > > front left
> > > front right
> > > rear left
> > > rear right
> > > center
> > > LFE
> >
> > Sorry I meant the spoken order, I've no idea what the
> > channel mapping of a 6 channel wav is.
> >
> > > Better to test with speaker-test program whether the mapping is
> > > correct.
> >
> > Ah didn't know about this program. Ok results with:
> > speaker-test -D hw:0,3 -s n
> > where n ranged from 0 to 6
> >
> > -s 1 speaker-test says front left actual is front left
> > likewise with -s 2 for front right
> > -s 3 speaker-test says should be rear left actual is lfe
> > that is the sound came from lfe
> > -s 4 speaker-test says rear right actual is centre
> > -s 5 speaker-test says centre actual was rear left
> > and -s 6 speaker-test says lfe actual is rear right
>
> Thanks. Also make sure that you pass -c 6 option.
If I understand it right, the ALSA channel sequence is defined in
speaker-test as:
static const char *channel_name[MAX_CHANNELS] = {
/* 0 */ N_("Front Left"),
/* 1 */ N_("Front Right"),
/* 2 */ N_("Rear Left"),
/* 3 */ N_("Rear Right"),
/* 4 */ N_("Center"), /* wav file is "Front Center.wav" */
/* 5 */ N_("LFE"), /* wav file is "Rear Center.wav" */
/* 6 */ N_("Side Left"),
/* 7 */ N_("Side Right"),
Whereas the HDMI channel mapping selected for 6-channel playback is
{ .ca_index = 0x0b, .speakers = { 0, 0, RR, RL, FC, LFE, FR, FL } },
Here the two mappings disagree on channels other than Front Left/Right.
In theory the channel mapping should be adjusted via AC_VERB_SET_HDMI_CHAN_SLOT.
However I found that verb takes no effect for G35/G45. So I'm afraid
there's no trivial ways we can adjust the channel mapping.
Thanks,
Fengguang
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