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From:   Ruslan Bilovol <ruslan.bilovol@gmail.com>
Date:   Tue, 24 Apr 2018 11:03:40 +0300
Message-ID: <CAB=otbQur-_pvTNccni-sNYuemo2aeiyahXUBZLoSALxphAzaA@mail.gmail.com>
Subject: Re: [alsa-devel] [PATCH 2/4] ALSA: usb-audio: ADC3: Fix channel
 mapping conversion for ADC3.
To:     Jorge Sanjuan <jorge.sanjuan@codethink.co.uk>
Cc:     Takashi Iwai <tiwai@suse.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        alsa-devel@alsa-project.org,
        Michael Drake <michael.drake@codethink.co.uk>,
        linux-kernel@vger.kernel.org
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On Fri, Apr 20, 2018 at 8:03 PM, Jorge Sanjuan
<jorge.sanjuan@codethink.co.uk> wrote:
> From: Michael Drake <michael.drake@codethink.co.uk>
>
> The channel mapping is defined by bChRelationship, not bChPurpose.
>
> Signed-off-by: Michael Drake <michael.drake@codethink.co.uk>
> ---
>  sound/usb/stream.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/sound/usb/stream.c b/sound/usb/stream.c
> index 6a8f5843334e..956be9f7c72a 100644
> --- a/sound/usb/stream.c
> +++ b/sound/usb/stream.c
> @@ -349,7 +349,7 @@ snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
>                          * TODO: this conversion is not complete, update it
>                          * after adding UAC3 values to asound.h
>                          */
> -                       switch (is->bChPurpose) {
> +                       switch (is->bChRelationship) {

Good catch!

Somehow I overlooked this, so in my case of Generic Audio it is always
mono.

Reviewed-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>

>                         case UAC3_CH_MONO:
>                                 map = SNDRV_CHMAP_MONO;
>                                 break;
> --
> 2.11.0
>
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