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ALSA: usb-audio: map UAC3 front wide channels in convert_chmap_v3()

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convert_chmap_v3() translates UAC3 channel relationship values into
ALSA channel-map positions.

UAC3_CH_FRONT_WIDE_LEFT and UAC3_CH_FRONT_WIDE_RIGHT currently fall
back to SNDRV_CHMAP_UNKNOWN, although ALSA already provides matching
channel-map positions via SNDRV_CHMAP_FLW and SNDRV_CHMAP_FRW.

Map these two UAC3 positions to their ALSA equivalents and update the
comment to clarify that unsupported UAC3 channel relationships remain
reported as SNDRV_CHMAP_UNKNOWN.

No functional change for other channel relationships.

Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Link: https://patch.msgid.link/20260311200010.103710-1-cassiogabrielcontato@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Cássio Gabriel
2026-03-11 17:00:10 -03:00
committed by Takashi Iwai
parent fd7df93013
commit 103a7b97c6
1 changed files with 8 additions and 0 deletions
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8
sound/usb/stream.c
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@@ -366,6 +366,8 @@ 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
* NOTE: not all UAC3 channel relationship have a
* direct ALSA chmap equivalent.
*/
switch (is->bChRelationship) {
case UAC3_CH_MONO:
@@ -390,6 +392,12 @@ snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
case UAC3_CH_FRONT_RIGHT_OF_CENTER:
map = SNDRV_CHMAP_FRC;
break;
case UAC3_CH_FRONT_WIDE_LEFT:
map = SNDRV_CHMAP_FLW;
break;
case UAC3_CH_FRONT_WIDE_RIGHT:
map = SNDRV_CHMAP_FRW;
break;
case UAC3_CH_SIDE_LEFT:
map = SNDRV_CHMAP_SL;
break;