@@ -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 */
@@ -80,6 +80,7 @@ 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 == (1 << UAC_FORMAT_TYPE_I_UNDEFINED))) {
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. Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com> --- sound/usb/card.h | 1 + sound/usb/format.c | 1 + 2 files changed, 2 insertions(+)