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Message-ID: <20241011000650.2585600-27-quic_wcheng@quicinc.com>
Date: Thu, 10 Oct 2024 17:06:11 -0700
From: Wesley Cheng <quic_wcheng@...cinc.com>
To: <srinivas.kandagatla@...aro.org>, <mathias.nyman@...el.com>,
<perex@...ex.cz>, <conor+dt@...nel.org>, <dmitry.torokhov@...il.com>,
<corbet@....net>, <broonie@...nel.org>, <lgirdwood@...il.com>,
<tiwai@...e.com>, <krzk+dt@...nel.org>,
<pierre-louis.bossart@...ux.intel.com>, <Thinh.Nguyen@...opsys.com>,
<bgoswami@...cinc.com>, <robh@...nel.org>,
<gregkh@...uxfoundation.org>
CC: <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-sound@...r.kernel.org>, <linux-input@...r.kernel.org>,
<linux-usb@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
<linux-doc@...r.kernel.org>, <alsa-devel@...a-project.org>,
Wesley Cheng
<quic_wcheng@...cinc.com>
Subject: [PATCH v28 13/33] ALSA: usb-audio: Save UAC sample size information
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@...cinc.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 4f4f3f39b7fa..b65163c60176 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 3b45d0ee7693..5fde543536a8 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))) {
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