dsoundaudio: fix "Could not lock capture buffer" warning

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 <[email protected]> Message-id: [email protected] Signed-off-by: Gerd Hoffmann <[email protected]>
dreddy · Apr 6, 2020 · 1747029 · 1747029
1 parent 4ba664c
commit 1747029
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/audio/dsoundaudio.c b/audio/dsoundaudio.c
@@ -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) {