diff options
| author | Jacob Meuser <jakemsr@cvs.openbsd.org> | 2007-10-08 01:00:14 +0000 |
|---|---|---|
| committer | Jacob Meuser <jakemsr@cvs.openbsd.org> | 2007-10-08 01:00:14 +0000 |
| commit | d378ec7cb7f4a207fe5cc27974c79941f7c583d0 (patch) | |
| tree | b1988a0aca4beda50de91ea3d077347ab4869377 /lib/libossaudio/ossaudio.c | |
| parent | d803a5a240bde200a9a8c90cdf8eb96738d37afd (diff) | |
- make SNDCTL_DSP_GETOSPACE much more efficient by using AUDIO_GETPRINO
instead of AUDIO_GETINFO
- make SNDCTL_DSP_GETISPACE return correct values by using AUDIO_GETRRINFO
instead of AUDIO_GETINFO
- remove calls to setblocksize() from SNDCTL_DSP_GET[IO]SPACE. changing
the blocksize inside play or record loops, where these ioctls are most
often used, can have serious negative consequences. the blocksize
should be "fixed" to a power of 2 before these ioctls are called by
using SNDCTL_DSP_SETFRAGMENT or SNDCTL_DSP_GETBLKSIZE.
heavily tested by myself. no negative feedback from anyone else.
ok ratchov
Diffstat (limited to 'lib/libossaudio/ossaudio.c')
| -rw-r--r-- | lib/libossaudio/ossaudio.c | 27 |
1 files changed, 12 insertions, 15 deletions
diff --git a/lib/libossaudio/ossaudio.c b/lib/libossaudio/ossaudio.c index c1718a2d236..2d40f0b3d89 100644 --- a/lib/libossaudio/ossaudio.c +++ b/lib/libossaudio/ossaudio.c @@ -1,4 +1,4 @@ -/* $OpenBSD: ossaudio.c,v 1.10 2007/09/28 01:15:15 jakemsr Exp $ */ +/* $OpenBSD: ossaudio.c,v 1.11 2007/10/08 01:00:13 jakemsr Exp $ */ /* $NetBSD: ossaudio.c,v 1.14 2001/05/10 01:53:48 augustss Exp $ */ /*- @@ -97,6 +97,7 @@ audio_ioctl(int fd, unsigned long com, void *argp) struct audio_buf_info bufinfo; struct count_info cntinfo; struct audio_encoding tmpenc; + struct audio_bufinfo tmpab; u_int u; int idat, idata; int retval; @@ -343,27 +344,23 @@ audio_ioctl(int fd, unsigned long com, void *argp) INTARG = idat; break; case SNDCTL_DSP_GETOSPACE: - retval = ioctl(fd, AUDIO_GETINFO, &tmpinfo); + retval = ioctl(fd, AUDIO_GETPRINFO, &tmpab); if (retval < 0) return retval; - setblocksize(fd, &tmpinfo); - bufinfo.fragsize = tmpinfo.blocksize; - bufinfo.fragments = tmpinfo.hiwat - - (tmpinfo.play.seek + tmpinfo.blocksize - 1)/tmpinfo.blocksize; - bufinfo.fragstotal = tmpinfo.hiwat; - bufinfo.bytes = tmpinfo.hiwat * tmpinfo.blocksize - tmpinfo.play.seek; + bufinfo.fragsize = tmpab.blksize; + bufinfo.fragstotal = tmpab.hiwat; + bufinfo.bytes = tmpab.hiwat * tmpab.blksize - tmpab.seek; + bufinfo.fragments = bufinfo.bytes / tmpab.blksize; *(struct audio_buf_info *)argp = bufinfo; break; case SNDCTL_DSP_GETISPACE: - retval = ioctl(fd, AUDIO_GETINFO, &tmpinfo); + retval = ioctl(fd, AUDIO_GETRRINFO, &tmpab); if (retval < 0) return retval; - setblocksize(fd, &tmpinfo); - bufinfo.fragsize = tmpinfo.blocksize; - bufinfo.fragments = tmpinfo.hiwat - - (tmpinfo.record.seek + tmpinfo.blocksize - 1)/tmpinfo.blocksize; - bufinfo.fragstotal = tmpinfo.hiwat; - bufinfo.bytes = tmpinfo.hiwat * tmpinfo.blocksize - tmpinfo.record.seek; + bufinfo.fragsize = tmpab.blksize; + bufinfo.fragstotal = tmpab.hiwat; + bufinfo.bytes = tmpab.seek; + bufinfo.fragments = bufinfo.bytes / tmpab.blksize; *(struct audio_buf_info *)argp = bufinfo; break; case SNDCTL_DSP_NONBLOCK: |