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| author | Cássio Gabriel <cassiogabrielcontato@gmail.com> | 2026-03-11 23:00:10 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2026-03-12 09:36:18 +0300 |
| commit | 103a7b97c63905ab4d1463bf040e27f668e6a340 (patch) | |
| tree | 1996f9e7f27ffd7f6eeae2d235a6a821445425db | |
| parent | fd7df93013c5118812e63a52635dc6c3a805a1de (diff) | |
| download | linux-103a7b97c63905ab4d1463bf040e27f668e6a340.tar.xz | |
ALSA: usb-audio: map UAC3 front wide channels in convert_chmap_v3()
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>
| -rw-r--r-- | sound/usb/stream.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sound/usb/stream.c b/sound/usb/stream.c index d38c39e28f38..2532bf97e05e 100644 --- a/sound/usb/stream.c +++ b/sound/usb/stream.c @@ -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; |