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audio: replace open-coded buffer arithmetic

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Replace open-coded buffer arithmetic with the new function
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>
Reviewed-by: Akihiko Odaki <akihiko.odaki@gmail.com>
Message-Id: <20220301191311.26695-1-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Volker Rümelin
2022-03-01 20:12:57 +01:00
committed by Gerd Hoffmann
parent 3a4d06f26f
commit 18404ff111
4 changed files with 29 additions and 30 deletions
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13
audio/audio_int.h
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@ -266,6 +266,19 @@ static inline size_t audio_ring_dist(size_t dst, size_t src, size_t len)
return (dst >= src) ? (dst - src) : (len - src + dst);
}
/**
* audio_ring_posb() - returns new position in ringbuffer in backward
* direction at given distance
*
* @pos: current position in ringbuffer
* @dist: distance in ringbuffer to walk in reverse direction
* @len: size of ringbuffer
*/
static inline size_t audio_ring_posb(size_t pos, size_t dist, size_t len)
{
return pos >= dist ? pos - dist : len - dist + pos;
}
#define dolog(fmt, ...) AUD_log(AUDIO_CAP, fmt, ## __VA_ARGS__)
#ifdef DEBUG