[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <52f10356-ecf7-4c92-b0c3-78f7a63ae85c@linux.intel.com>
Date: Wed, 25 Sep 2024 16:22:57 +0200
From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To: Wesley Cheng <quic_wcheng@...cinc.com>, 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,
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
Subject: Re: [PATCH v28 12/32] ALSA: usb-audio: Save UAC sample size
information
On 9/25/24 02:59, Wesley Cheng wrote:
> 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>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.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))) {
Powered by blists - more mailing lists