Message ID | 20240208231406.27397-28-quic_wcheng@quicinc.com |
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State | New |
Headers |
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Series |
Introduce QC USB SND audio offloading support
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Commit Message
Wesley Cheng
Feb. 8, 2024, 11:13 p.m. UTC
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
exisiting 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(+)
diff --git a/sound/usb/card.h b/sound/usb/card.h index 2884912adc96..02e4ea898db5 100644 --- a/sound/usb/card.h +++ b/sound/usb/card.h @@ -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 */ diff --git a/sound/usb/format.c b/sound/usb/format.c index ab5fed9f55b6..1721e4f360fb 100644 --- a/sound/usb/format.c +++ b/sound/usb/format.c @@ -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))) {