Cygwin: dsp: Avoid setting buffer that is too small.

The buffer size that is too small causes choppy sound. That is not
practical at all. With this patch, the minimum value of the buffer
size (i.e. fragstotal * fragsize) is restricted to 16384 bytes.

Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>

diff --git a/winsup/cygwin/fhandler/dsp.cc b/winsup/cygwin/fhandler/dsp.cc
index 03c812a9cb8f2eadc99d69265272515f3f181f1e..97f3eaa2778602e9c02b700e788532bf62ce120b 100644 (file)
--- a/winsup/cygwin/fhandler/dsp.cc
+++ b/winsup/cygwin/fhandler/dsp.cc
@@ -1430,6 +1430,8 @@ fhandler_dev_dsp::_ioctl (unsigned int cmd, void *buf)
        int *p = (int *) buf;
        fragstotal_ = min (*p >> 16, MAX_BLOCKS);
        fragsize_ = 1 << (*p & 0xffff);
+       while (fragsize_ * fragstotal_ < 16384)
+         fragsize_ *= 2;
        fragment_has_been_set = true;
        return 0;
       }