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ALSA: usb-audio: Save UAC sample size information

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Within the UAC descriptor, there is information describing the size of a
sample (bSubframeSize/bSubslotSize) and the number of relevant bits
(bBitResolution).  Currently, fmt_bits carries only the bit resolution,
however, some offloading entities may also require the overall size of the
sample.  Save this information in a separate parameter, as depending on the
UAC format type, the sample size can not easily be decoded from other
existing parameters.

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409194804.3773260-11-quic_wcheng@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wesley Cheng
2025-04-09 12:47:43 -07:00
committed by Greg Kroah-Hartman
parent 2bde439265
commit d893d5eaab
2 changed files with 2 additions and 0 deletions
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1
sound/usb/card.h
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@@ -15,6 +15,7 @@ struct audioformat {
unsigned int channels; /* # channels */
unsigned int fmt_type; /* USB audio format type (1-3) */
unsigned int fmt_bits; /* number of significant bits */
unsigned int fmt_sz; /* overall audio sub frame/slot size */
unsigned int frame_size; /* samples per frame for non-audio */
unsigned char iface; /* interface number */
unsigned char altsetting; /* corresponding alternate setting */

1
sound/usb/format.c
View File

@@ -85,6 +85,7 @@ static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
}
fp->fmt_bits = sample_width;
fp->fmt_sz = sample_bytes;
if ((pcm_formats == 0) &&
(format == 0 || format == BIT(UAC_FORMAT_TYPE_I_UNDEFINED))) {