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dsoundaudio: fix "Could not lock capture buffer" warning

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IDirectSoundCaptureBuffer_Lock() fails on Windows when called
with len = 0. Return early from dsound_get_buffer_in() in this
case.

To reproduce the warning start a linux guest. In the guest
start Audacity and you will see a lot of "Could not lock
capture buffer" warnings.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-id: 20200405075017.9901-2-vr_qemu@t-online.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Volker Rümelin 2020-04-05 09:50:16 +02:00 committed by Gerd Hoffmann
parent 4ba664cb0a
commit 174702986c
1 changed files with 5 additions and 0 deletions
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5
audio/dsoundaudio.c
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@ -542,6 +542,11 @@ static void *dsound_get_buffer_in(HWVoiceIn *hw, size_t *size)
req_size = audio_ring_dist(cpos, hw->pos_emul, hw->size_emul);
req_size = MIN(req_size, hw->size_emul - hw->pos_emul);
if (req_size == 0) {
*size = 0;
return NULL;
}
err = dsound_lock_in(dscb, &hw->info, hw->pos_emul, req_size, &ret, NULL,
&act_size, NULL, false, ds->s);
if (err) {