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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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11
audio/sdlaudio.c
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@ -224,12 +224,11 @@ static void sdl_callback_out(void *opaque, Uint8 *buf, int len)
/* dolog("callback_out: len=%d avail=%zu\n", len, hw->pending_emul); */
while (hw->pending_emul && len) {
size_t write_len;
ssize_t start = (ssize_t)hw->pos_emul - hw->pending_emul;
if (start < 0) {
start += hw->size_emul;
}
assert(start >= 0 && start < hw->size_emul);
size_t write_len, start;
start = audio_ring_posb(hw->pos_emul, hw->pending_emul,
hw->size_emul);
assert(start < hw->size_emul);
write_len = MIN(MIN(hw->pending_emul, len),
hw->size_emul - start);