[PATCH][LINUX][ALSA][USB AUDIO CLASS 1] wrong channel ids for surround

25 Jul 2024

Hi,
In the USB audio class 1 specifications, page 33 (3.7.2.3 Audio Channel Cluster Format):
Surround is spatially defined as [rear], hence left surround should be SNDRV_CHMAP_RL and not SND_CHMAP_SL (Side).
Same for right surround channel.
Right?
I am not a mailing list subscriber, CC me please.
regards,
-- 
Sylvain BERTRAND

--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -244,8 +244,8 @@ static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
    	SNDRV_CHMAP_FR,		/* right front */
    	SNDRV_CHMAP_FC,		/* center front */
    	SNDRV_CHMAP_LFE,	/* LFE */
-		SNDRV_CHMAP_SL,		/* left surround */
-		SNDRV_CHMAP_SR,		/* right surround */
+		SNDRV_CHMAP_RL,		/* left surround */
+		SNDRV_CHMAP_RR,		/* right surround */
    	SNDRV_CHMAP_FLC,	/* left of center */
    	SNDRV_CHMAP_FRC,	/* right of center */
    	SNDRV_CHMAP_RC,		/* surround */


    