Re: [PATCH 01/15] audio: replace open-coded buffer arithmetic

[Thomas Huth <huth@tuxfamily.org>]

Am Thu,  6 Jan 2022 10:23:18 +0100
schrieb Volker Rümelin <volker.ruemelin@t-online.de>:

> From: Volker Rümelin <vr_qemu@t-online.de>
> 
> Replace open-coded buffer arithmetic with the available function
> audio_ring_dist(). Because the name audio_ring_dist implies it
> calculates the distance between two points, define the alias
> function name audio_ring_posb. That's the position in backward
> direction of a given point at a given distance.
> 
> Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
> ---
>  audio/audio.c     | 25 +++++++------------------
>  audio/audio_int.h |  2 ++
>  audio/coreaudio.c | 10 ++++------
>  audio/sdlaudio.c  | 11 +++++------
>  4 files changed, 18 insertions(+), 30 deletions(-)
[...]
> diff --git a/audio/audio_int.h b/audio/audio_int.h
> index 428a091d05..928d8e107e 100644
> --- a/audio/audio_int.h
> +++ b/audio/audio_int.h
> @@ -266,6 +266,8 @@ static inline size_t audio_ring_dist(size_t dst,
> size_t src, size_t len) return (dst >= src) ? (dst - src) : (len -
> src + dst); }
>  
> +#define audio_ring_posb(pos, dist, len) audio_ring_dist(pos, dist,
> len)

I think this will be quite incomprehensible for people reading the
source code later (without seeing your commit message above). Thus I'd
prefer to directly use audio_ring_dist() everywhere instead. But in
case you insist on this macro, please add at least a comment in front
of it for explanation.

 Thomas