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oss: use integer arithmetic to scale volume.

This commit is contained in:
Alexandre Ratchov 2018-03-02 07:42:53 +01:00
parent f1cd80bb72
commit 220e7731bc
1 changed files with 2 additions and 2 deletions
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4
libsndio/sio_oss.c
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@ -777,7 +777,7 @@ sio_oss_setvol(struct sio_hdl *sh, unsigned int vol)
int newvol; int newvol;
/* Scale to 0..100 */ /* Scale to 0..100 */
newvol = 1.0 * 100 * vol / SIO_MAXVOL; newvol = (100 * vol + SIO_MAXVOL / 2) / SIO_MAXVOL;
newvol = newvol | (newvol << 8); newvol = newvol | (newvol << 8);
if (ioctl(hdl->fd, SNDCTL_DSP_SETPLAYVOL, &newvol) < 0) { if (ioctl(hdl->fd, SNDCTL_DSP_SETPLAYVOL, &newvol) < 0) {
@ -802,7 +802,7 @@ sio_oss_getvol(struct sio_hdl *sh)
} }
/* Use left channel volume and scale to SIO_MAXVOL */ /* Use left channel volume and scale to SIO_MAXVOL */
vol = SIO_MAXVOL * 1.0 * (vol & 0x7f) / 100; vol = (SIO_MAXVOL * (vol & 0x7f) + 50) / 100;
_sio_onvol_cb(&hdl->sio, vol); _sio_onvol_cb(&hdl->sio, vol);
} }