linux-kernel - Re: [PATCH 1/2] ALSA: aloop: Add support for the non-interleaved access mode

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Date:   Thu, 5 Oct 2023 09:23:51 +0200
From:   Jaroslav Kysela <perex@...ex.cz>
To:     Ivan Orlov <ivan.orlov0322@...il.com>, tiwai@...e.com
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ALSA: aloop: Add support for the non-interleaved
 access mode

On 27. 09. 23 13:35, Ivan Orlov wrote:
> The current version of the loopback driver supports interleaved access
> mode only. This patch introduces support for the non-interleaved
> access mode.
> 
> When in the interleaved mode, the 'copy_play_buf' function copies data
> from the playback to the capture buffer using one memcpy call. This call
> copies samples for multiple, interleaved channels.
> 
> In the non-interleaved mode we have multiple channel buffers, so we have
> to perform multiple memcpy calls to copy samples channel after channel.
> 
> Add new function called 'copy_play_buf_part_n', which copies a part of
> each channel buffer from playback to capture. Modify the 'copy_play_buf'
> to use the corresponding memory copy function(just memcpy /
> copy_play_buf_part_n) depending on the access mode.
> 
> Signed-off-by: Ivan Orlov <ivan.orlov0322@...il.com>

Nice extension. Thank you.

> +static void copy_play_buf_part_n(struct loopback_pcm *play, struct loopback_pcm *capt,
> +				 unsigned int size, unsigned int src_off, unsigned int dst_off)

I would probably prefer to have dst,src,size arguments to follow memcpy, but 
it's really nitpicking.

Reviewed-by: Jaroslav Kysela <perex@...ex.cz>

					Jaroslav

-- 
Jaroslav Kysela <perex@...ex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.